Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 3932:b0efc7ee3b31
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342 | 1 /* |
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP | |
27 | |
28 #include "gc_implementation/g1/concurrentMark.hpp" | |
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29 #include "gc_implementation/g1/g1AllocRegion.hpp" |
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30 #include "gc_implementation/g1/g1HRPrinter.hpp" |
1972 | 31 #include "gc_implementation/g1/g1RemSet.hpp" |
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32 #include "gc_implementation/g1/g1MonitoringSupport.hpp" |
3766 | 33 #include "gc_implementation/g1/heapRegionSeq.hpp" |
2152 | 34 #include "gc_implementation/g1/heapRegionSets.hpp" |
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35 #include "gc_implementation/shared/hSpaceCounters.hpp" |
1972 | 36 #include "gc_implementation/parNew/parGCAllocBuffer.hpp" |
37 #include "memory/barrierSet.hpp" | |
38 #include "memory/memRegion.hpp" | |
39 #include "memory/sharedHeap.hpp" | |
40 | |
342 | 41 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
42 // It uses the "Garbage First" heap organization and algorithm, which | |
43 // may combine concurrent marking with parallel, incremental compaction of | |
44 // heap subsets that will yield large amounts of garbage. | |
45 | |
46 class HeapRegion; | |
2173 | 47 class HRRSCleanupTask; |
342 | 48 class PermanentGenerationSpec; |
49 class GenerationSpec; | |
50 class OopsInHeapRegionClosure; | |
51 class G1ScanHeapEvacClosure; | |
52 class ObjectClosure; | |
53 class SpaceClosure; | |
54 class CompactibleSpaceClosure; | |
55 class Space; | |
56 class G1CollectorPolicy; | |
57 class GenRemSet; | |
58 class G1RemSet; | |
59 class HeapRegionRemSetIterator; | |
60 class ConcurrentMark; | |
61 class ConcurrentMarkThread; | |
62 class ConcurrentG1Refine; | |
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63 class GenerationCounters; |
342 | 64 |
1709 | 65 typedef OverflowTaskQueue<StarTask> RefToScanQueue; |
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66 typedef GenericTaskQueueSet<RefToScanQueue> RefToScanQueueSet; |
342 | 67 |
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68 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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69 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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70 |
342 | 71 enum GCAllocPurpose { |
72 GCAllocForTenured, | |
73 GCAllocForSurvived, | |
74 GCAllocPurposeCount | |
75 }; | |
76 | |
77 class YoungList : public CHeapObj { | |
78 private: | |
79 G1CollectedHeap* _g1h; | |
80 | |
81 HeapRegion* _head; | |
82 | |
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83 HeapRegion* _survivor_head; |
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84 HeapRegion* _survivor_tail; |
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85 |
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86 HeapRegion* _curr; |
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87 |
342 | 88 size_t _length; |
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89 size_t _survivor_length; |
342 | 90 |
91 size_t _last_sampled_rs_lengths; | |
92 size_t _sampled_rs_lengths; | |
93 | |
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94 void empty_list(HeapRegion* list); |
342 | 95 |
96 public: | |
97 YoungList(G1CollectedHeap* g1h); | |
98 | |
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99 void push_region(HeapRegion* hr); |
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100 void add_survivor_region(HeapRegion* hr); |
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101 |
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102 void empty_list(); |
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103 bool is_empty() { return _length == 0; } |
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104 size_t length() { return _length; } |
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105 size_t survivor_length() { return _survivor_length; } |
342 | 106 |
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107 // Currently we do not keep track of the used byte sum for the |
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108 // young list and the survivors and it'd be quite a lot of work to |
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109 // do so. When we'll eventually replace the young list with |
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110 // instances of HeapRegionLinkedList we'll get that for free. So, |
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111 // we'll report the more accurate information then. |
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112 size_t eden_used_bytes() { |
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113 assert(length() >= survivor_length(), "invariant"); |
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114 return (length() - survivor_length()) * HeapRegion::GrainBytes; |
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115 } |
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116 size_t survivor_used_bytes() { |
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117 return survivor_length() * HeapRegion::GrainBytes; |
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118 } |
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119 |
342 | 120 void rs_length_sampling_init(); |
121 bool rs_length_sampling_more(); | |
122 void rs_length_sampling_next(); | |
123 | |
124 void reset_sampled_info() { | |
125 _last_sampled_rs_lengths = 0; | |
126 } | |
127 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
128 | |
129 // for development purposes | |
130 void reset_auxilary_lists(); | |
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131 void clear() { _head = NULL; _length = 0; } |
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132 |
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133 void clear_survivors() { |
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134 _survivor_head = NULL; |
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135 _survivor_tail = NULL; |
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136 _survivor_length = 0; |
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137 } |
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138 |
342 | 139 HeapRegion* first_region() { return _head; } |
140 HeapRegion* first_survivor_region() { return _survivor_head; } | |
545 | 141 HeapRegion* last_survivor_region() { return _survivor_tail; } |
342 | 142 |
143 // debugging | |
144 bool check_list_well_formed(); | |
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145 bool check_list_empty(bool check_sample = true); |
342 | 146 void print(); |
147 }; | |
148 | |
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149 class MutatorAllocRegion : public G1AllocRegion { |
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150 protected: |
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151 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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152 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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153 public: |
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154 MutatorAllocRegion() |
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155 : G1AllocRegion("Mutator Alloc Region", false /* bot_updates */) { } |
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156 }; |
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157 |
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158 class SurvivorGCAllocRegion : public G1AllocRegion { |
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159 protected: |
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160 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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161 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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162 public: |
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163 SurvivorGCAllocRegion() |
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164 : G1AllocRegion("Survivor GC Alloc Region", false /* bot_updates */) { } |
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165 }; |
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166 |
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167 class OldGCAllocRegion : public G1AllocRegion { |
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168 protected: |
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169 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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170 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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171 public: |
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172 OldGCAllocRegion() |
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173 : G1AllocRegion("Old GC Alloc Region", true /* bot_updates */) { } |
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174 }; |
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175 |
342 | 176 class RefineCardTableEntryClosure; |
177 class G1CollectedHeap : public SharedHeap { | |
178 friend class VM_G1CollectForAllocation; | |
179 friend class VM_GenCollectForPermanentAllocation; | |
180 friend class VM_G1CollectFull; | |
181 friend class VM_G1IncCollectionPause; | |
182 friend class VMStructs; | |
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183 friend class MutatorAllocRegion; |
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184 friend class SurvivorGCAllocRegion; |
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185 friend class OldGCAllocRegion; |
342 | 186 |
187 // Closures used in implementation. | |
188 friend class G1ParCopyHelper; | |
189 friend class G1IsAliveClosure; | |
190 friend class G1EvacuateFollowersClosure; | |
191 friend class G1ParScanThreadState; | |
192 friend class G1ParScanClosureSuper; | |
193 friend class G1ParEvacuateFollowersClosure; | |
194 friend class G1ParTask; | |
195 friend class G1FreeGarbageRegionClosure; | |
196 friend class RefineCardTableEntryClosure; | |
197 friend class G1PrepareCompactClosure; | |
198 friend class RegionSorter; | |
2152 | 199 friend class RegionResetter; |
342 | 200 friend class CountRCClosure; |
201 friend class EvacPopObjClosure; | |
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202 friend class G1ParCleanupCTTask; |
342 | 203 |
204 // Other related classes. | |
205 friend class G1MarkSweep; | |
206 | |
207 private: | |
208 // The one and only G1CollectedHeap, so static functions can find it. | |
209 static G1CollectedHeap* _g1h; | |
210 | |
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211 static size_t _humongous_object_threshold_in_words; |
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212 |
342 | 213 // Storage for the G1 heap (excludes the permanent generation). |
214 VirtualSpace _g1_storage; | |
215 MemRegion _g1_reserved; | |
216 | |
217 // The part of _g1_storage that is currently committed. | |
218 MemRegion _g1_committed; | |
219 | |
2152 | 220 // The master free list. It will satisfy all new region allocations. |
221 MasterFreeRegionList _free_list; | |
222 | |
223 // The secondary free list which contains regions that have been | |
224 // freed up during the cleanup process. This will be appended to the | |
225 // master free list when appropriate. | |
226 SecondaryFreeRegionList _secondary_free_list; | |
227 | |
228 // It keeps track of the humongous regions. | |
229 MasterHumongousRegionSet _humongous_set; | |
342 | 230 |
231 // The number of regions we could create by expansion. | |
232 size_t _expansion_regions; | |
233 | |
234 // The block offset table for the G1 heap. | |
235 G1BlockOffsetSharedArray* _bot_shared; | |
236 | |
237 // Move all of the regions off the free lists, then rebuild those free | |
238 // lists, before and after full GC. | |
239 void tear_down_region_lists(); | |
240 void rebuild_region_lists(); | |
241 | |
242 // The sequence of all heap regions in the heap. | |
3766 | 243 HeapRegionSeq _hrs; |
342 | 244 |
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245 // Alloc region used to satisfy mutator allocation requests. |
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246 MutatorAllocRegion _mutator_alloc_region; |
342 | 247 |
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248 // Alloc region used to satisfy allocation requests by the GC for |
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249 // survivor objects. |
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250 SurvivorGCAllocRegion _survivor_gc_alloc_region; |
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251 |
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252 // Alloc region used to satisfy allocation requests by the GC for |
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253 // old objects. |
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254 OldGCAllocRegion _old_gc_alloc_region; |
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255 |
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256 // The last old region we allocated to during the last GC. |
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257 // Typically, it is not full so we should re-use it during the next GC. |
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258 HeapRegion* _retained_old_gc_alloc_region; |
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259 |
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260 // It resets the mutator alloc region before new allocations can take place. |
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261 void init_mutator_alloc_region(); |
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262 |
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263 // It releases the mutator alloc region. |
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264 void release_mutator_alloc_region(); |
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265 |
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266 // It initializes the GC alloc regions at the start of a GC. |
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267 void init_gc_alloc_regions(); |
342 | 268 |
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269 // It releases the GC alloc regions at the end of a GC. |
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270 void release_gc_alloc_regions(); |
342 | 271 |
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272 // It does any cleanup that needs to be done on the GC alloc regions |
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273 // before a Full GC. |
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274 void abandon_gc_alloc_regions(); |
342 | 275 |
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276 // Helper for monitoring and management support. |
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277 G1MonitoringSupport* _g1mm; |
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278 |
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279 // Determines PLAB size for a particular allocation purpose. |
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280 static size_t desired_plab_sz(GCAllocPurpose purpose); |
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281 |
342 | 282 // Outside of GC pauses, the number of bytes used in all regions other |
283 // than the current allocation region. | |
284 size_t _summary_bytes_used; | |
285 | |
526 | 286 // This is used for a quick test on whether a reference points into |
287 // the collection set or not. Basically, we have an array, with one | |
288 // byte per region, and that byte denotes whether the corresponding | |
289 // region is in the collection set or not. The entry corresponding | |
290 // the bottom of the heap, i.e., region 0, is pointed to by | |
291 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
292 // biased so that it actually points to address 0 of the address | |
293 // space, to make the test as fast as possible (we can simply shift | |
294 // the address to address into it, instead of having to subtract the | |
295 // bottom of the heap from the address before shifting it; basically | |
296 // it works in the same way the card table works). | |
297 bool* _in_cset_fast_test; | |
298 | |
299 // The allocated array used for the fast test on whether a reference | |
300 // points into the collection set or not. This field is also used to | |
301 // free the array. | |
302 bool* _in_cset_fast_test_base; | |
303 | |
304 // The length of the _in_cset_fast_test_base array. | |
305 size_t _in_cset_fast_test_length; | |
306 | |
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307 volatile unsigned _gc_time_stamp; |
342 | 308 |
309 size_t* _surviving_young_words; | |
310 | |
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311 G1HRPrinter _hr_printer; |
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312 |
342 | 313 void setup_surviving_young_words(); |
314 void update_surviving_young_words(size_t* surv_young_words); | |
315 void cleanup_surviving_young_words(); | |
316 | |
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317 // It decides whether an explicit GC should start a concurrent cycle |
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318 // instead of doing a STW GC. Currently, a concurrent cycle is |
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319 // explicitly started if: |
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320 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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321 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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322 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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323 |
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324 // Keeps track of how many "full collections" (i.e., Full GCs or |
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325 // concurrent cycles) we have completed. The number of them we have |
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326 // started is maintained in _total_full_collections in CollectedHeap. |
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327 volatile unsigned int _full_collections_completed; |
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328 |
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329 // This is a non-product method that is helpful for testing. It is |
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330 // called at the end of a GC and artificially expands the heap by |
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331 // allocating a number of dead regions. This way we can induce very |
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332 // frequent marking cycles and stress the cleanup / concurrent |
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333 // cleanup code more (as all the regions that will be allocated by |
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334 // this method will be found dead by the marking cycle). |
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335 void allocate_dummy_regions() PRODUCT_RETURN; |
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336 |
1973 | 337 // These are macros so that, if the assert fires, we get the correct |
338 // line number, file, etc. | |
339 | |
2361 | 340 #define heap_locking_asserts_err_msg(_extra_message_) \ |
2152 | 341 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
2361 | 342 (_extra_message_), \ |
2152 | 343 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
344 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
345 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
1973 | 346 |
347 #define assert_heap_locked() \ | |
348 do { \ | |
349 assert(Heap_lock->owned_by_self(), \ | |
350 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
351 } while (0) | |
352 | |
2361 | 353 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
1973 | 354 do { \ |
355 assert(Heap_lock->owned_by_self() || \ | |
2152 | 356 (SafepointSynchronize::is_at_safepoint() && \ |
2361 | 357 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
1973 | 358 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
359 "should be at a safepoint")); \ | |
360 } while (0) | |
361 | |
362 #define assert_heap_locked_and_not_at_safepoint() \ | |
363 do { \ | |
364 assert(Heap_lock->owned_by_self() && \ | |
365 !SafepointSynchronize::is_at_safepoint(), \ | |
366 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
367 "should not be at a safepoint")); \ | |
368 } while (0) | |
369 | |
370 #define assert_heap_not_locked() \ | |
371 do { \ | |
372 assert(!Heap_lock->owned_by_self(), \ | |
373 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
374 } while (0) | |
375 | |
376 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
377 do { \ | |
378 assert(!Heap_lock->owned_by_self() && \ | |
379 !SafepointSynchronize::is_at_safepoint(), \ | |
380 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
381 "should not be at a safepoint")); \ | |
382 } while (0) | |
383 | |
2361 | 384 #define assert_at_safepoint(_should_be_vm_thread_) \ |
1973 | 385 do { \ |
2152 | 386 assert(SafepointSynchronize::is_at_safepoint() && \ |
2361 | 387 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
1973 | 388 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
389 } while (0) | |
390 | |
391 #define assert_not_at_safepoint() \ | |
392 do { \ | |
393 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
394 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
395 } while (0) | |
396 | |
342 | 397 protected: |
398 | |
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399 // The young region list. |
342 | 400 YoungList* _young_list; |
401 | |
402 // The current policy object for the collector. | |
403 G1CollectorPolicy* _g1_policy; | |
404 | |
2152 | 405 // This is the second level of trying to allocate a new region. If |
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406 // new_region() didn't find a region on the free_list, this call will |
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407 // check whether there's anything available on the |
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408 // secondary_free_list and/or wait for more regions to appear on |
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409 // that list, if _free_regions_coming is set. |
2361 | 410 HeapRegion* new_region_try_secondary_free_list(); |
342 | 411 |
2361 | 412 // Try to allocate a single non-humongous HeapRegion sufficient for |
413 // an allocation of the given word_size. If do_expand is true, | |
414 // attempt to expand the heap if necessary to satisfy the allocation | |
415 // request. | |
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416 HeapRegion* new_region(size_t word_size, bool do_expand); |
342 | 417 |
2361 | 418 // Attempt to satisfy a humongous allocation request of the given |
419 // size by finding a contiguous set of free regions of num_regions | |
420 // length and remove them from the master free list. Return the | |
3766 | 421 // index of the first region or G1_NULL_HRS_INDEX if the search |
422 // was unsuccessful. | |
423 size_t humongous_obj_allocate_find_first(size_t num_regions, | |
424 size_t word_size); | |
342 | 425 |
2361 | 426 // Initialize a contiguous set of free regions of length num_regions |
427 // and starting at index first so that they appear as a single | |
428 // humongous region. | |
3766 | 429 HeapWord* humongous_obj_allocate_initialize_regions(size_t first, |
2361 | 430 size_t num_regions, |
431 size_t word_size); | |
432 | |
433 // Attempt to allocate a humongous object of the given size. Return | |
434 // NULL if unsuccessful. | |
2152 | 435 HeapWord* humongous_obj_allocate(size_t word_size); |
1973 | 436 |
437 // The following two methods, allocate_new_tlab() and | |
438 // mem_allocate(), are the two main entry points from the runtime | |
439 // into the G1's allocation routines. They have the following | |
440 // assumptions: | |
441 // | |
442 // * They should both be called outside safepoints. | |
443 // | |
444 // * They should both be called without holding the Heap_lock. | |
445 // | |
446 // * All allocation requests for new TLABs should go to | |
447 // allocate_new_tlab(). | |
448 // | |
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449 // * All non-TLAB allocation requests should go to mem_allocate(). |
1973 | 450 // |
451 // * If either call cannot satisfy the allocation request using the | |
452 // current allocating region, they will try to get a new one. If | |
453 // this fails, they will attempt to do an evacuation pause and | |
454 // retry the allocation. | |
455 // | |
456 // * If all allocation attempts fail, even after trying to schedule | |
457 // an evacuation pause, allocate_new_tlab() will return NULL, | |
458 // whereas mem_allocate() will attempt a heap expansion and/or | |
459 // schedule a Full GC. | |
460 // | |
461 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
462 // should never be called with word_size being humongous. All | |
463 // humongous allocation requests should go to mem_allocate() which | |
464 // will satisfy them with a special path. | |
465 | |
466 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
467 | |
468 virtual HeapWord* mem_allocate(size_t word_size, | |
469 bool* gc_overhead_limit_was_exceeded); | |
342 | 470 |
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471 // The following three methods take a gc_count_before_ret |
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472 // parameter which is used to return the GC count if the method |
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473 // returns NULL. Given that we are required to read the GC count |
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474 // while holding the Heap_lock, and these paths will take the |
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475 // Heap_lock at some point, it's easier to get them to read the GC |
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476 // count while holding the Heap_lock before they return NULL instead |
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477 // of the caller (namely: mem_allocate()) having to also take the |
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478 // Heap_lock just to read the GC count. |
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479 |
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480 // First-level mutator allocation attempt: try to allocate out of |
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481 // the mutator alloc region without taking the Heap_lock. This |
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482 // should only be used for non-humongous allocations. |
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483 inline HeapWord* attempt_allocation(size_t word_size, |
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484 unsigned int* gc_count_before_ret); |
342 | 485 |
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486 // Second-level mutator allocation attempt: take the Heap_lock and |
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487 // retry the allocation attempt, potentially scheduling a GC |
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488 // pause. This should only be used for non-humongous allocations. |
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489 HeapWord* attempt_allocation_slow(size_t word_size, |
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490 unsigned int* gc_count_before_ret); |
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491 |
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492 // Takes the Heap_lock and attempts a humongous allocation. It can |
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493 // potentially schedule a GC pause. |
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494 HeapWord* attempt_allocation_humongous(size_t word_size, |
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495 unsigned int* gc_count_before_ret); |
1973 | 496 |
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497 // Allocation attempt that should be called during safepoints (e.g., |
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498 // at the end of a successful GC). expect_null_mutator_alloc_region |
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499 // specifies whether the mutator alloc region is expected to be NULL |
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500 // or not. |
1973 | 501 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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502 bool expect_null_mutator_alloc_region); |
1973 | 503 |
504 // It dirties the cards that cover the block so that so that the post | |
505 // write barrier never queues anything when updating objects on this | |
506 // block. It is assumed (and in fact we assert) that the block | |
507 // belongs to a young region. | |
508 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
342 | 509 |
510 // Allocate blocks during garbage collection. Will ensure an | |
511 // allocation region, either by picking one or expanding the | |
512 // heap, and then allocate a block of the given size. The block | |
513 // may not be a humongous - it must fit into a single heap region. | |
514 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
515 | |
516 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, | |
517 HeapRegion* alloc_region, | |
518 bool par, | |
519 size_t word_size); | |
520 | |
521 // Ensure that no further allocations can happen in "r", bearing in mind | |
522 // that parallel threads might be attempting allocations. | |
523 void par_allocate_remaining_space(HeapRegion* r); | |
524 | |
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525 // Allocation attempt during GC for a survivor object / PLAB. |
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526 inline HeapWord* survivor_attempt_allocation(size_t word_size); |
545 | 527 |
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528 // Allocation attempt during GC for an old object / PLAB. |
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529 inline HeapWord* old_attempt_allocation(size_t word_size); |
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530 |
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531 // These methods are the "callbacks" from the G1AllocRegion class. |
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532 |
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533 // For mutator alloc regions. |
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534 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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535 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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536 size_t allocated_bytes); |
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537 |
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538 // For GC alloc regions. |
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539 HeapRegion* new_gc_alloc_region(size_t word_size, size_t count, |
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540 GCAllocPurpose ap); |
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541 void retire_gc_alloc_region(HeapRegion* alloc_region, |
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542 size_t allocated_bytes, GCAllocPurpose ap); |
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543 |
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544 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
1973 | 545 // inspection request and should collect the entire heap |
546 // - if clear_all_soft_refs is true, all soft references should be | |
547 // cleared during the GC | |
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548 // - if explicit_gc is false, word_size describes the allocation that |
1973 | 549 // the GC should attempt (at least) to satisfy |
550 // - it returns false if it is unable to do the collection due to the | |
551 // GC locker being active, true otherwise | |
552 bool do_collection(bool explicit_gc, | |
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553 bool clear_all_soft_refs, |
342 | 554 size_t word_size); |
555 | |
556 // Callback from VM_G1CollectFull operation. | |
557 // Perform a full collection. | |
558 void do_full_collection(bool clear_all_soft_refs); | |
559 | |
560 // Resize the heap if necessary after a full collection. If this is | |
561 // after a collect-for allocation, "word_size" is the allocation size, | |
562 // and will be considered part of the used portion of the heap. | |
563 void resize_if_necessary_after_full_collection(size_t word_size); | |
564 | |
565 // Callback from VM_G1CollectForAllocation operation. | |
566 // This function does everything necessary/possible to satisfy a | |
567 // failed allocation request (including collection, expansion, etc.) | |
1973 | 568 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
342 | 569 |
570 // Attempting to expand the heap sufficiently | |
571 // to support an allocation of the given "word_size". If | |
572 // successful, perform the allocation and return the address of the | |
573 // allocated block, or else "NULL". | |
1973 | 574 HeapWord* expand_and_allocate(size_t word_size); |
342 | 575 |
576 public: | |
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577 |
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578 G1MonitoringSupport* g1mm() { return _g1mm; } |
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579 |
342 | 580 // Expand the garbage-first heap by at least the given size (in bytes!). |
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581 // Returns true if the heap was expanded by the requested amount; |
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582 // false otherwise. |
342 | 583 // (Rounds up to a HeapRegion boundary.) |
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584 bool expand(size_t expand_bytes); |
342 | 585 |
586 // Do anything common to GC's. | |
587 virtual void gc_prologue(bool full); | |
588 virtual void gc_epilogue(bool full); | |
589 | |
526 | 590 // We register a region with the fast "in collection set" test. We |
591 // simply set to true the array slot corresponding to this region. | |
592 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
593 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
594 assert(r->in_collection_set(), "invariant"); | |
3766 | 595 size_t index = r->hrs_index(); |
596 assert(index < _in_cset_fast_test_length, "invariant"); | |
526 | 597 assert(!_in_cset_fast_test_base[index], "invariant"); |
598 _in_cset_fast_test_base[index] = true; | |
599 } | |
600 | |
601 // This is a fast test on whether a reference points into the | |
602 // collection set or not. It does not assume that the reference | |
603 // points into the heap; if it doesn't, it will return false. | |
604 bool in_cset_fast_test(oop obj) { | |
605 assert(_in_cset_fast_test != NULL, "sanity"); | |
606 if (_g1_committed.contains((HeapWord*) obj)) { | |
607 // no need to subtract the bottom of the heap from obj, | |
608 // _in_cset_fast_test is biased | |
609 size_t index = ((size_t) obj) >> HeapRegion::LogOfHRGrainBytes; | |
610 bool ret = _in_cset_fast_test[index]; | |
611 // let's make sure the result is consistent with what the slower | |
612 // test returns | |
613 assert( ret || !obj_in_cs(obj), "sanity"); | |
614 assert(!ret || obj_in_cs(obj), "sanity"); | |
615 return ret; | |
616 } else { | |
617 return false; | |
618 } | |
619 } | |
620 | |
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621 void clear_cset_fast_test() { |
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622 assert(_in_cset_fast_test_base != NULL, "sanity"); |
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623 memset(_in_cset_fast_test_base, false, |
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624 _in_cset_fast_test_length * sizeof(bool)); |
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625 } |
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626 |
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627 // This is called at the end of either a concurrent cycle or a Full |
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628 // GC to update the number of full collections completed. Those two |
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629 // can happen in a nested fashion, i.e., we start a concurrent |
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630 // cycle, a Full GC happens half-way through it which ends first, |
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631 // and then the cycle notices that a Full GC happened and ends |
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632 // too. The concurrent parameter is a boolean to help us do a bit |
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633 // tighter consistency checking in the method. If concurrent is |
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634 // false, the caller is the inner caller in the nesting (i.e., the |
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635 // Full GC). If concurrent is true, the caller is the outer caller |
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636 // in this nesting (i.e., the concurrent cycle). Further nesting is |
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637 // not currently supported. The end of the this call also notifies |
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638 // the FullGCCount_lock in case a Java thread is waiting for a full |
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639 // GC to happen (e.g., it called System.gc() with |
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640 // +ExplicitGCInvokesConcurrent). |
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641 void increment_full_collections_completed(bool concurrent); |
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642 |
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643 unsigned int full_collections_completed() { |
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644 return _full_collections_completed; |
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645 } |
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646 |
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647 G1HRPrinter* hr_printer() { return &_hr_printer; } |
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648 |
342 | 649 protected: |
650 | |
651 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
652 // (Rounds down to a HeapRegion boundary.) | |
653 virtual void shrink(size_t expand_bytes); | |
654 void shrink_helper(size_t expand_bytes); | |
655 | |
1709 | 656 #if TASKQUEUE_STATS |
657 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
658 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
659 void reset_taskqueue_stats(); | |
660 #endif // TASKQUEUE_STATS | |
661 | |
1973 | 662 // Schedule the VM operation that will do an evacuation pause to |
663 // satisfy an allocation request of word_size. *succeeded will | |
664 // return whether the VM operation was successful (it did do an | |
665 // evacuation pause) or not (another thread beat us to it or the GC | |
666 // locker was active). Given that we should not be holding the | |
667 // Heap_lock when we enter this method, we will pass the | |
668 // gc_count_before (i.e., total_collections()) as a parameter since | |
669 // it has to be read while holding the Heap_lock. Currently, both | |
670 // methods that call do_collection_pause() release the Heap_lock | |
671 // before the call, so it's easy to read gc_count_before just before. | |
672 HeapWord* do_collection_pause(size_t word_size, | |
673 unsigned int gc_count_before, | |
674 bool* succeeded); | |
342 | 675 |
676 // The guts of the incremental collection pause, executed by the vm | |
1973 | 677 // thread. It returns false if it is unable to do the collection due |
678 // to the GC locker being active, true otherwise | |
679 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
342 | 680 |
681 // Actually do the work of evacuating the collection set. | |
1973 | 682 void evacuate_collection_set(); |
342 | 683 |
684 // The g1 remembered set of the heap. | |
685 G1RemSet* _g1_rem_set; | |
686 // And it's mod ref barrier set, used to track updates for the above. | |
687 ModRefBarrierSet* _mr_bs; | |
688 | |
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689 // A set of cards that cover the objects for which the Rsets should be updated |
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690 // concurrently after the collection. |
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691 DirtyCardQueueSet _dirty_card_queue_set; |
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692 |
342 | 693 // The Heap Region Rem Set Iterator. |
694 HeapRegionRemSetIterator** _rem_set_iterator; | |
695 | |
696 // The closure used to refine a single card. | |
697 RefineCardTableEntryClosure* _refine_cte_cl; | |
698 | |
699 // A function to check the consistency of dirty card logs. | |
700 void check_ct_logs_at_safepoint(); | |
701 | |
1705 | 702 // A DirtyCardQueueSet that is used to hold cards that contain |
703 // references into the current collection set. This is used to | |
704 // update the remembered sets of the regions in the collection | |
705 // set in the event of an evacuation failure. | |
706 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
707 | |
342 | 708 // After a collection pause, make the regions in the CS into free |
709 // regions. | |
710 void free_collection_set(HeapRegion* cs_head); | |
711 | |
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712 // Abandon the current collection set without recording policy |
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713 // statistics or updating free lists. |
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714 void abandon_collection_set(HeapRegion* cs_head); |
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715 |
342 | 716 // Applies "scan_non_heap_roots" to roots outside the heap, |
717 // "scan_rs" to roots inside the heap (having done "set_region" to | |
718 // indicate the region in which the root resides), and does "scan_perm" | |
719 // (setting the generation to the perm generation.) If "scan_rs" is | |
720 // NULL, then this step is skipped. The "worker_i" | |
721 // param is for use with parallel roots processing, and should be | |
722 // the "i" of the calling parallel worker thread's work(i) function. | |
723 // In the sequential case this param will be ignored. | |
724 void g1_process_strong_roots(bool collecting_perm_gen, | |
725 SharedHeap::ScanningOption so, | |
726 OopClosure* scan_non_heap_roots, | |
727 OopsInHeapRegionClosure* scan_rs, | |
728 OopsInGenClosure* scan_perm, | |
729 int worker_i); | |
730 | |
731 // Apply "blk" to all the weak roots of the system. These include | |
732 // JNI weak roots, the code cache, system dictionary, symbol table, | |
733 // string table, and referents of reachable weak refs. | |
734 void g1_process_weak_roots(OopClosure* root_closure, | |
735 OopClosure* non_root_closure); | |
736 | |
2361 | 737 // Frees a non-humongous region by initializing its contents and |
2152 | 738 // adding it to the free list that's passed as a parameter (this is |
739 // usually a local list which will be appended to the master free | |
740 // list later). The used bytes of freed regions are accumulated in | |
741 // pre_used. If par is true, the region's RSet will not be freed | |
742 // up. The assumption is that this will be done later. | |
743 void free_region(HeapRegion* hr, | |
744 size_t* pre_used, | |
745 FreeRegionList* free_list, | |
746 bool par); | |
342 | 747 |
2361 | 748 // Frees a humongous region by collapsing it into individual regions |
749 // and calling free_region() for each of them. The freed regions | |
750 // will be added to the free list that's passed as a parameter (this | |
751 // is usually a local list which will be appended to the master free | |
752 // list later). The used bytes of freed regions are accumulated in | |
753 // pre_used. If par is true, the region's RSet will not be freed | |
754 // up. The assumption is that this will be done later. | |
2152 | 755 void free_humongous_region(HeapRegion* hr, |
756 size_t* pre_used, | |
757 FreeRegionList* free_list, | |
758 HumongousRegionSet* humongous_proxy_set, | |
759 bool par); | |
342 | 760 |
3766 | 761 // Notifies all the necessary spaces that the committed space has |
762 // been updated (either expanded or shrunk). It should be called | |
763 // after _g1_storage is updated. | |
764 void update_committed_space(HeapWord* old_end, HeapWord* new_end); | |
765 | |
342 | 766 // The concurrent marker (and the thread it runs in.) |
767 ConcurrentMark* _cm; | |
768 ConcurrentMarkThread* _cmThread; | |
769 bool _mark_in_progress; | |
770 | |
771 // The concurrent refiner. | |
772 ConcurrentG1Refine* _cg1r; | |
773 | |
774 // The parallel task queues | |
775 RefToScanQueueSet *_task_queues; | |
776 | |
777 // True iff a evacuation has failed in the current collection. | |
778 bool _evacuation_failed; | |
779 | |
780 // Set the attribute indicating whether evacuation has failed in the | |
781 // current collection. | |
782 void set_evacuation_failed(bool b) { _evacuation_failed = b; } | |
783 | |
784 // Failed evacuations cause some logical from-space objects to have | |
785 // forwarding pointers to themselves. Reset them. | |
786 void remove_self_forwarding_pointers(); | |
787 | |
788 // When one is non-null, so is the other. Together, they each pair is | |
789 // an object with a preserved mark, and its mark value. | |
790 GrowableArray<oop>* _objs_with_preserved_marks; | |
791 GrowableArray<markOop>* _preserved_marks_of_objs; | |
792 | |
793 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
794 // word being overwritten with a self-forwarding-pointer. | |
795 void preserve_mark_if_necessary(oop obj, markOop m); | |
796 | |
797 // The stack of evac-failure objects left to be scanned. | |
798 GrowableArray<oop>* _evac_failure_scan_stack; | |
799 // The closure to apply to evac-failure objects. | |
800 | |
801 OopsInHeapRegionClosure* _evac_failure_closure; | |
802 // Set the field above. | |
803 void | |
804 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
805 _evac_failure_closure = evac_failure_closure; | |
806 } | |
807 | |
808 // Push "obj" on the scan stack. | |
809 void push_on_evac_failure_scan_stack(oop obj); | |
810 // Process scan stack entries until the stack is empty. | |
811 void drain_evac_failure_scan_stack(); | |
812 // True iff an invocation of "drain_scan_stack" is in progress; to | |
813 // prevent unnecessary recursion. | |
814 bool _drain_in_progress; | |
815 | |
816 // Do any necessary initialization for evacuation-failure handling. | |
817 // "cl" is the closure that will be used to process evac-failure | |
818 // objects. | |
819 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
820 // Do any necessary cleanup for evacuation-failure handling data | |
821 // structures. | |
822 void finalize_for_evac_failure(); | |
823 | |
824 // An attempt to evacuate "obj" has failed; take necessary steps. | |
825 oop handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, oop obj); | |
826 void handle_evacuation_failure_common(oop obj, markOop m); | |
827 | |
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828 // Instance of the concurrent mark is_alive closure for embedding |
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829 // into the reference processor as the is_alive_non_header. This |
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830 // prevents unnecessary additions to the discovered lists during |
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831 // concurrent discovery. |
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832 G1CMIsAliveClosure _is_alive_closure; |
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833 |
342 | 834 // ("Weak") Reference processing support |
835 ReferenceProcessor* _ref_processor; | |
836 | |
837 enum G1H_process_strong_roots_tasks { | |
838 G1H_PS_mark_stack_oops_do, | |
839 G1H_PS_refProcessor_oops_do, | |
840 // Leave this one last. | |
841 G1H_PS_NumElements | |
842 }; | |
843 | |
844 SubTasksDone* _process_strong_tasks; | |
845 | |
2152 | 846 volatile bool _free_regions_coming; |
342 | 847 |
848 public: | |
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849 |
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850 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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851 |
342 | 852 void set_refine_cte_cl_concurrency(bool concurrent); |
853 | |
1709 | 854 RefToScanQueue *task_queue(int i) const; |
342 | 855 |
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856 // A set of cards where updates happened during the GC |
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857 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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858 |
1705 | 859 // A DirtyCardQueueSet that is used to hold cards that contain |
860 // references into the current collection set. This is used to | |
861 // update the remembered sets of the regions in the collection | |
862 // set in the event of an evacuation failure. | |
863 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
864 { return _into_cset_dirty_card_queue_set; } | |
865 | |
342 | 866 // Create a G1CollectedHeap with the specified policy. |
867 // Must call the initialize method afterwards. | |
868 // May not return if something goes wrong. | |
869 G1CollectedHeap(G1CollectorPolicy* policy); | |
870 | |
871 // Initialize the G1CollectedHeap to have the initial and | |
872 // maximum sizes, permanent generation, and remembered and barrier sets | |
873 // specified by the policy object. | |
874 jint initialize(); | |
875 | |
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876 virtual void ref_processing_init(); |
342 | 877 |
878 void set_par_threads(int t) { | |
879 SharedHeap::set_par_threads(t); | |
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880 _process_strong_tasks->set_n_threads(t); |
342 | 881 } |
882 | |
883 virtual CollectedHeap::Name kind() const { | |
884 return CollectedHeap::G1CollectedHeap; | |
885 } | |
886 | |
887 // The current policy object for the collector. | |
888 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
889 | |
890 // Adaptive size policy. No such thing for g1. | |
891 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
892 | |
893 // The rem set and barrier set. | |
894 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
895 ModRefBarrierSet* mr_bs() const { return _mr_bs; } | |
896 | |
897 // The rem set iterator. | |
898 HeapRegionRemSetIterator* rem_set_iterator(int i) { | |
899 return _rem_set_iterator[i]; | |
900 } | |
901 | |
902 HeapRegionRemSetIterator* rem_set_iterator() { | |
903 return _rem_set_iterator[0]; | |
904 } | |
905 | |
906 unsigned get_gc_time_stamp() { | |
907 return _gc_time_stamp; | |
908 } | |
909 | |
910 void reset_gc_time_stamp() { | |
911 _gc_time_stamp = 0; | |
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912 OrderAccess::fence(); |
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913 } |
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914 |
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915 void increment_gc_time_stamp() { |
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916 ++_gc_time_stamp; |
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917 OrderAccess::fence(); |
342 | 918 } |
919 | |
1705 | 920 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
921 DirtyCardQueue* into_cset_dcq, | |
922 bool concurrent, int worker_i); | |
342 | 923 |
924 // The shared block offset table array. | |
925 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
926 | |
927 // Reference Processing accessor | |
928 ReferenceProcessor* ref_processor() { return _ref_processor; } | |
929 | |
930 virtual size_t capacity() const; | |
931 virtual size_t used() const; | |
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932 // This should be called when we're not holding the heap lock. The |
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933 // result might be a bit inaccurate. |
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934 size_t used_unlocked() const; |
342 | 935 size_t recalculate_used() const; |
936 | |
937 // These virtual functions do the actual allocation. | |
938 // Some heaps may offer a contiguous region for shared non-blocking | |
939 // allocation, via inlined code (by exporting the address of the top and | |
940 // end fields defining the extent of the contiguous allocation region.) | |
941 // But G1CollectedHeap doesn't yet support this. | |
942 | |
943 // Return an estimate of the maximum allocation that could be performed | |
944 // without triggering any collection or expansion activity. In a | |
945 // generational collector, for example, this is probably the largest | |
946 // allocation that could be supported (without expansion) in the youngest | |
947 // generation. It is "unsafe" because no locks are taken; the result | |
948 // should be treated as an approximation, not a guarantee, for use in | |
949 // heuristic resizing decisions. | |
950 virtual size_t unsafe_max_alloc(); | |
951 | |
952 virtual bool is_maximal_no_gc() const { | |
953 return _g1_storage.uncommitted_size() == 0; | |
954 } | |
955 | |
956 // The total number of regions in the heap. | |
3766 | 957 size_t n_regions() { return _hrs.length(); } |
958 | |
959 // The max number of regions in the heap. | |
960 size_t max_regions() { return _hrs.max_length(); } | |
342 | 961 |
962 // The number of regions that are completely free. | |
3766 | 963 size_t free_regions() { return _free_list.length(); } |
342 | 964 |
965 // The number of regions that are not completely free. | |
966 size_t used_regions() { return n_regions() - free_regions(); } | |
967 | |
968 // The number of regions available for "regular" expansion. | |
969 size_t expansion_regions() { return _expansion_regions; } | |
970 | |
3766 | 971 // Factory method for HeapRegion instances. It will return NULL if |
972 // the allocation fails. | |
973 HeapRegion* new_heap_region(size_t hrs_index, HeapWord* bottom); | |
974 | |
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975 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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976 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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977 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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978 void verify_dirty_young_regions() PRODUCT_RETURN; |
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979 |
2152 | 980 // verify_region_sets() performs verification over the region |
981 // lists. It will be compiled in the product code to be used when | |
982 // necessary (i.e., during heap verification). | |
983 void verify_region_sets(); | |
342 | 984 |
2152 | 985 // verify_region_sets_optional() is planted in the code for |
986 // list verification in non-product builds (and it can be enabled in | |
987 // product builds by definning HEAP_REGION_SET_FORCE_VERIFY to be 1). | |
988 #if HEAP_REGION_SET_FORCE_VERIFY | |
989 void verify_region_sets_optional() { | |
990 verify_region_sets(); | |
991 } | |
992 #else // HEAP_REGION_SET_FORCE_VERIFY | |
993 void verify_region_sets_optional() { } | |
994 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
342 | 995 |
2152 | 996 #ifdef ASSERT |
2361 | 997 bool is_on_master_free_list(HeapRegion* hr) { |
2152 | 998 return hr->containing_set() == &_free_list; |
999 } | |
342 | 1000 |
2361 | 1001 bool is_in_humongous_set(HeapRegion* hr) { |
2152 | 1002 return hr->containing_set() == &_humongous_set; |
2361 | 1003 } |
2152 | 1004 #endif // ASSERT |
342 | 1005 |
2152 | 1006 // Wrapper for the region list operations that can be called from |
1007 // methods outside this class. | |
342 | 1008 |
2152 | 1009 void secondary_free_list_add_as_tail(FreeRegionList* list) { |
1010 _secondary_free_list.add_as_tail(list); | |
1011 } | |
342 | 1012 |
2152 | 1013 void append_secondary_free_list() { |
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1014 _free_list.add_as_head(&_secondary_free_list); |
2152 | 1015 } |
342 | 1016 |
2361 | 1017 void append_secondary_free_list_if_not_empty_with_lock() { |
1018 // If the secondary free list looks empty there's no reason to | |
1019 // take the lock and then try to append it. | |
2152 | 1020 if (!_secondary_free_list.is_empty()) { |
1021 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
1022 append_secondary_free_list(); | |
1023 } | |
1024 } | |
342 | 1025 |
2152 | 1026 void set_free_regions_coming(); |
1027 void reset_free_regions_coming(); | |
1028 bool free_regions_coming() { return _free_regions_coming; } | |
1029 void wait_while_free_regions_coming(); | |
342 | 1030 |
1031 // Perform a collection of the heap; intended for use in implementing | |
1032 // "System.gc". This probably implies as full a collection as the | |
1033 // "CollectedHeap" supports. | |
1034 virtual void collect(GCCause::Cause cause); | |
1035 | |
1036 // The same as above but assume that the caller holds the Heap_lock. | |
1037 void collect_locked(GCCause::Cause cause); | |
1038 | |
1039 // This interface assumes that it's being called by the | |
1040 // vm thread. It collects the heap assuming that the | |
1041 // heap lock is already held and that we are executing in | |
1042 // the context of the vm thread. | |
1043 virtual void collect_as_vm_thread(GCCause::Cause cause); | |
1044 | |
1045 // True iff a evacuation has failed in the most-recent collection. | |
1046 bool evacuation_failed() { return _evacuation_failed; } | |
1047 | |
2152 | 1048 // It will free a region if it has allocated objects in it that are |
1049 // all dead. It calls either free_region() or | |
1050 // free_humongous_region() depending on the type of the region that | |
1051 // is passed to it. | |
2173 | 1052 void free_region_if_empty(HeapRegion* hr, |
1053 size_t* pre_used, | |
1054 FreeRegionList* free_list, | |
1055 HumongousRegionSet* humongous_proxy_set, | |
1056 HRRSCleanupTask* hrrs_cleanup_task, | |
1057 bool par); | |
342 | 1058 |
2152 | 1059 // It appends the free list to the master free list and updates the |
1060 // master humongous list according to the contents of the proxy | |
1061 // list. It also adjusts the total used bytes according to pre_used | |
1062 // (if par is true, it will do so by taking the ParGCRareEvent_lock). | |
1063 void update_sets_after_freeing_regions(size_t pre_used, | |
1064 FreeRegionList* free_list, | |
1065 HumongousRegionSet* humongous_proxy_set, | |
1066 bool par); | |
342 | 1067 |
1068 // Returns "TRUE" iff "p" points into the allocated area of the heap. | |
1069 virtual bool is_in(const void* p) const; | |
1070 | |
1071 // Return "TRUE" iff the given object address is within the collection | |
1072 // set. | |
1073 inline bool obj_in_cs(oop obj); | |
1074 | |
1075 // Return "TRUE" iff the given object address is in the reserved | |
1076 // region of g1 (excluding the permanent generation). | |
1077 bool is_in_g1_reserved(const void* p) const { | |
1078 return _g1_reserved.contains(p); | |
1079 } | |
1080 | |
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1081 // Returns a MemRegion that corresponds to the space that has been |
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1082 // reserved for the heap |
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1083 MemRegion g1_reserved() { |
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1084 return _g1_reserved; |
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1085 } |
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1086 |
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1087 // Returns a MemRegion that corresponds to the space that has been |
342 | 1088 // committed in the heap |
1089 MemRegion g1_committed() { | |
1090 return _g1_committed; | |
1091 } | |
1092 | |
2311 | 1093 virtual bool is_in_closed_subset(const void* p) const; |
342 | 1094 |
1095 // This resets the card table to all zeros. It is used after | |
1096 // a collection pause which used the card table to claim cards. | |
1097 void cleanUpCardTable(); | |
1098 | |
1099 // Iteration functions. | |
1100 | |
1101 // Iterate over all the ref-containing fields of all objects, calling | |
1102 // "cl.do_oop" on each. | |
678 | 1103 virtual void oop_iterate(OopClosure* cl) { |
1104 oop_iterate(cl, true); | |
1105 } | |
1106 void oop_iterate(OopClosure* cl, bool do_perm); | |
342 | 1107 |
1108 // Same as above, restricted to a memory region. | |
678 | 1109 virtual void oop_iterate(MemRegion mr, OopClosure* cl) { |
1110 oop_iterate(mr, cl, true); | |
1111 } | |
1112 void oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm); | |
342 | 1113 |
1114 // Iterate over all objects, calling "cl.do_object" on each. | |
678 | 1115 virtual void object_iterate(ObjectClosure* cl) { |
1116 object_iterate(cl, true); | |
1117 } | |
1118 virtual void safe_object_iterate(ObjectClosure* cl) { | |
1119 object_iterate(cl, true); | |
1120 } | |
1121 void object_iterate(ObjectClosure* cl, bool do_perm); | |
342 | 1122 |
1123 // Iterate over all objects allocated since the last collection, calling | |
1124 // "cl.do_object" on each. The heap must have been initialized properly | |
1125 // to support this function, or else this call will fail. | |
1126 virtual void object_iterate_since_last_GC(ObjectClosure* cl); | |
1127 | |
1128 // Iterate over all spaces in use in the heap, in ascending address order. | |
1129 virtual void space_iterate(SpaceClosure* cl); | |
1130 | |
1131 // Iterate over heap regions, in address order, terminating the | |
1132 // iteration early if the "doHeapRegion" method returns "true". | |
3766 | 1133 void heap_region_iterate(HeapRegionClosure* blk) const; |
342 | 1134 |
1135 // Iterate over heap regions starting with r (or the first region if "r" | |
1136 // is NULL), in address order, terminating early if the "doHeapRegion" | |
1137 // method returns "true". | |
3766 | 1138 void heap_region_iterate_from(HeapRegion* r, HeapRegionClosure* blk) const; |
342 | 1139 |
3766 | 1140 // Return the region with the given index. It assumes the index is valid. |
1141 HeapRegion* region_at(size_t index) const { return _hrs.at(index); } | |
342 | 1142 |
1143 // Divide the heap region sequence into "chunks" of some size (the number | |
1144 // of regions divided by the number of parallel threads times some | |
1145 // overpartition factor, currently 4). Assumes that this will be called | |
1146 // in parallel by ParallelGCThreads worker threads with discinct worker | |
1147 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
1148 // calls will use the same "claim_value", and that that claim value is | |
1149 // different from the claim_value of any heap region before the start of | |
1150 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
1151 // attempting to claim the first region in each chunk, and, if | |
1152 // successful, applying the closure to each region in the chunk (and | |
1153 // setting the claim value of the second and subsequent regions of the | |
1154 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
1155 // i.e., that a closure never attempt to abort a traversal. | |
1156 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
1157 int worker, | |
1158 jint claim_value); | |
1159 | |
390 | 1160 // It resets all the region claim values to the default. |
1161 void reset_heap_region_claim_values(); | |
1162 | |
355 | 1163 #ifdef ASSERT |
1164 bool check_heap_region_claim_values(jint claim_value); | |
1165 #endif // ASSERT | |
1166 | |
342 | 1167 // Iterate over the regions (if any) in the current collection set. |
1168 void collection_set_iterate(HeapRegionClosure* blk); | |
1169 | |
1170 // As above but starting from region r | |
1171 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
1172 | |
1173 // Returns the first (lowest address) compactible space in the heap. | |
1174 virtual CompactibleSpace* first_compactible_space(); | |
1175 | |
1176 // A CollectedHeap will contain some number of spaces. This finds the | |
1177 // space containing a given address, or else returns NULL. | |
1178 virtual Space* space_containing(const void* addr) const; | |
1179 | |
1180 // A G1CollectedHeap will contain some number of heap regions. This | |
1181 // finds the region containing a given address, or else returns NULL. | |
3766 | 1182 template <class T> |
1183 inline HeapRegion* heap_region_containing(const T addr) const; | |
342 | 1184 |
1185 // Like the above, but requires "addr" to be in the heap (to avoid a | |
1186 // null-check), and unlike the above, may return an continuing humongous | |
1187 // region. | |
3766 | 1188 template <class T> |
1189 inline HeapRegion* heap_region_containing_raw(const T addr) const; | |
342 | 1190 |
1191 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
1192 // each address in the (reserved) heap is a member of exactly | |
1193 // one block. The defining characteristic of a block is that it is | |
1194 // possible to find its size, and thus to progress forward to the next | |
1195 // block. (Blocks may be of different sizes.) Thus, blocks may | |
1196 // represent Java objects, or they might be free blocks in a | |
1197 // free-list-based heap (or subheap), as long as the two kinds are | |
1198 // distinguishable and the size of each is determinable. | |
1199 | |
1200 // Returns the address of the start of the "block" that contains the | |
1201 // address "addr". We say "blocks" instead of "object" since some heaps | |
1202 // may not pack objects densely; a chunk may either be an object or a | |
1203 // non-object. | |
1204 virtual HeapWord* block_start(const void* addr) const; | |
1205 | |
1206 // Requires "addr" to be the start of a chunk, and returns its size. | |
1207 // "addr + size" is required to be the start of a new chunk, or the end | |
1208 // of the active area of the heap. | |
1209 virtual size_t block_size(const HeapWord* addr) const; | |
1210 | |
1211 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
1212 // the block is an object. | |
1213 virtual bool block_is_obj(const HeapWord* addr) const; | |
1214 | |
1215 // Does this heap support heap inspection? (+PrintClassHistogram) | |
1216 virtual bool supports_heap_inspection() const { return true; } | |
1217 | |
1218 // Section on thread-local allocation buffers (TLABs) | |
1219 // See CollectedHeap for semantics. | |
1220 | |
1221 virtual bool supports_tlab_allocation() const; | |
1222 virtual size_t tlab_capacity(Thread* thr) const; | |
1223 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
1224 | |
1225 // Can a compiler initialize a new object without store barriers? | |
1226 // This permission only extends from the creation of a new object | |
1027
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1227 // via a TLAB up to the first subsequent safepoint. If such permission |
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1228 // is granted for this heap type, the compiler promises to call |
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1229 // defer_store_barrier() below on any slow path allocation of |
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1230 // a new object for which such initializing store barriers will |
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1231 // have been elided. G1, like CMS, allows this, but should be |
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1232 // ready to provide a compensating write barrier as necessary |
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1233 // if that storage came out of a non-young region. The efficiency |
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1234 // of this implementation depends crucially on being able to |
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1235 // answer very efficiently in constant time whether a piece of |
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1236 // storage in the heap comes from a young region or not. |
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1237 // See ReduceInitialCardMarks. |
342 | 1238 virtual bool can_elide_tlab_store_barriers() const { |
1194
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1239 // 6920090: Temporarily disabled, because of lingering |
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1240 // instabilities related to RICM with G1. In the |
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1241 // interim, the option ReduceInitialCardMarksForG1 |
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1242 // below is left solely as a debugging device at least |
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1243 // until 6920109 fixes the instabilities. |
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1244 return ReduceInitialCardMarksForG1; |
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1245 } |
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1246 |
1166 | 1247 virtual bool card_mark_must_follow_store() const { |
1248 return true; | |
1249 } | |
1250 | |
3766 | 1251 bool is_in_young(const oop obj) { |
1027
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1252 HeapRegion* hr = heap_region_containing(obj); |
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1253 return hr != NULL && hr->is_young(); |
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1254 } |
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1255 |
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1256 #ifdef ASSERT |
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1257 virtual bool is_in_partial_collection(const void* p); |
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1258 #endif |
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1259 |
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1260 virtual bool is_scavengable(const void* addr); |
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1261 |
1027
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1262 // We don't need barriers for initializing stores to objects |
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1263 // in the young gen: for the SATB pre-barrier, there is no |
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1264 // pre-value that needs to be remembered; for the remembered-set |
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1265 // update logging post-barrier, we don't maintain remembered set |
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1266 // information for young gen objects. Note that non-generational |
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1267 // G1 does not have any "young" objects, should not elide |
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1268 // the rs logging barrier and so should always answer false below. |
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1269 // However, non-generational G1 (-XX:-G1Gen) appears to have |
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1270 // bit-rotted so was not tested below. |
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1271 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
1194
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1272 // Re 6920090, 6920109 above. |
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1273 assert(ReduceInitialCardMarksForG1, "Else cannot be here"); |
1027
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1274 assert(G1Gen || !is_in_young(new_obj), |
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1275 "Non-generational G1 should never return true below"); |
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1276 return is_in_young(new_obj); |
342 | 1277 } |
1278 | |
1279 // Can a compiler elide a store barrier when it writes | |
1280 // a permanent oop into the heap? Applies when the compiler | |
1281 // is storing x to the heap, where x->is_perm() is true. | |
1282 virtual bool can_elide_permanent_oop_store_barriers() const { | |
1283 // At least until perm gen collection is also G1-ified, at | |
1284 // which point this should return false. | |
1285 return true; | |
1286 } | |
1287 | |
1288 // Returns "true" iff the given word_size is "very large". | |
1289 static bool isHumongous(size_t word_size) { | |
1313
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1290 // Note this has to be strictly greater-than as the TLABs |
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1291 // are capped at the humongous thresold and we want to |
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1292 // ensure that we don't try to allocate a TLAB as |
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1293 // humongous and that we don't allocate a humongous |
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1294 // object in a TLAB. |
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1295 return word_size > _humongous_object_threshold_in_words; |
342 | 1296 } |
1297 | |
1298 // Update mod union table with the set of dirty cards. | |
1299 void updateModUnion(); | |
1300 | |
1301 // Set the mod union bits corresponding to the given memRegion. Note | |
1302 // that this is always a safe operation, since it doesn't clear any | |
1303 // bits. | |
1304 void markModUnionRange(MemRegion mr); | |
1305 | |
1306 // Records the fact that a marking phase is no longer in progress. | |
1307 void set_marking_complete() { | |
1308 _mark_in_progress = false; | |
1309 } | |
1310 void set_marking_started() { | |
1311 _mark_in_progress = true; | |
1312 } | |
1313 bool mark_in_progress() { | |
1314 return _mark_in_progress; | |
1315 } | |
1316 | |
1317 // Print the maximum heap capacity. | |
1318 virtual size_t max_capacity() const; | |
1319 | |
1320 virtual jlong millis_since_last_gc(); | |
1321 | |
1322 // Perform any cleanup actions necessary before allowing a verification. | |
1323 virtual void prepare_for_verify(); | |
1324 | |
1325 // Perform verification. | |
811 | 1326 |
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1327 // vo == UsePrevMarking -> use "prev" marking information, |
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1328 // vo == UseNextMarking -> use "next" marking information |
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1329 // vo == UseMarkWord -> use the mark word in the object header |
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1330 // |
811 | 1331 // NOTE: Only the "prev" marking information is guaranteed to be |
1332 // consistent most of the time, so most calls to this should use | |
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1333 // vo == UsePrevMarking. |
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1334 // Currently, there is only one case where this is called with |
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1335 // vo == UseNextMarking, which is to verify the "next" marking |
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1336 // information at the end of remark. |
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1337 // Currently there is only one place where this is called with |
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1338 // vo == UseMarkWord, which is to verify the marking during a |
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1339 // full GC. |
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1340 void verify(bool allow_dirty, bool silent, VerifyOption vo); |
811 | 1341 |
1342 // Override; it uses the "prev" marking information | |
342 | 1343 virtual void verify(bool allow_dirty, bool silent); |
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1344 // Default behavior by calling print(tty); |
342 | 1345 virtual void print() const; |
838
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1346 // This calls print_on(st, PrintHeapAtGCExtended). |
342 | 1347 virtual void print_on(outputStream* st) const; |
838
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1348 // If extended is true, it will print out information for all |
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1349 // regions in the heap by calling print_on_extended(st). |
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1350 virtual void print_on(outputStream* st, bool extended) const; |
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1351 virtual void print_on_extended(outputStream* st) const; |
342 | 1352 |
1353 virtual void print_gc_threads_on(outputStream* st) const; | |
1354 virtual void gc_threads_do(ThreadClosure* tc) const; | |
1355 | |
1356 // Override | |
1357 void print_tracing_info() const; | |
1358 | |
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1359 // The following two methods are helpful for debugging RSet issues. |
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1360 void print_cset_rsets() PRODUCT_RETURN; |
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1361 void print_all_rsets() PRODUCT_RETURN; |
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1362 |
342 | 1363 // Convenience function to be used in situations where the heap type can be |
1364 // asserted to be this type. | |
1365 static G1CollectedHeap* heap(); | |
1366 | |
1367 void empty_young_list(); | |
1368 | |
1369 void set_region_short_lived_locked(HeapRegion* hr); | |
1370 // add appropriate methods for any other surv rate groups | |
1371 | |
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1372 YoungList* young_list() { return _young_list; } |
342 | 1373 |
1374 // debugging | |
1375 bool check_young_list_well_formed() { | |
1376 return _young_list->check_list_well_formed(); | |
1377 } | |
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1378 |
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1379 bool check_young_list_empty(bool check_heap, |
342 | 1380 bool check_sample = true); |
1381 | |
1382 // *** Stuff related to concurrent marking. It's not clear to me that so | |
1383 // many of these need to be public. | |
1384 | |
1385 // The functions below are helper functions that a subclass of | |
1386 // "CollectedHeap" can use in the implementation of its virtual | |
1387 // functions. | |
1388 // This performs a concurrent marking of the live objects in a | |
1389 // bitmap off to the side. | |
1390 void doConcurrentMark(); | |
1391 | |
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1392 // Do a full concurrent marking, synchronously. |
342 | 1393 void do_sync_mark(); |
1394 | |
1395 bool isMarkedPrev(oop obj) const; | |
1396 bool isMarkedNext(oop obj) const; | |
1397 | |
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1398 // vo == UsePrevMarking -> use "prev" marking information, |
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1399 // vo == UseNextMarking -> use "next" marking information, |
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1400 // vo == UseMarkWord -> use mark word from object header |
811 | 1401 bool is_obj_dead_cond(const oop obj, |
1402 const HeapRegion* hr, | |
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1403 const VerifyOption vo) const { |
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1404 |
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1405 switch (vo) { |
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1406 case VerifyOption_G1UsePrevMarking: |
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1407 return is_obj_dead(obj, hr); |
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1408 case VerifyOption_G1UseNextMarking: |
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1409 return is_obj_ill(obj, hr); |
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1410 default: |
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1411 assert(vo == VerifyOption_G1UseMarkWord, "must be"); |
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1412 return !obj->is_gc_marked(); |
811 | 1413 } |
1414 } | |
1415 | |
342 | 1416 // Determine if an object is dead, given the object and also |
1417 // the region to which the object belongs. An object is dead | |
1418 // iff a) it was not allocated since the last mark and b) it | |
1419 // is not marked. | |
1420 | |
1421 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
1422 return | |
1423 !hr->obj_allocated_since_prev_marking(obj) && | |
1424 !isMarkedPrev(obj); | |
1425 } | |
1426 | |
1427 // This is used when copying an object to survivor space. | |
1428 // If the object is marked live, then we mark the copy live. | |
1429 // If the object is allocated since the start of this mark | |
1430 // cycle, then we mark the copy live. | |
1431 // If the object has been around since the previous mark | |
1432 // phase, and hasn't been marked yet during this phase, | |
1433 // then we don't mark it, we just wait for the | |
1434 // current marking cycle to get to it. | |
1435 | |
1436 // This function returns true when an object has been | |
1437 // around since the previous marking and hasn't yet | |
1438 // been marked during this marking. | |
1439 | |
1440 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
1441 return | |
1442 !hr->obj_allocated_since_next_marking(obj) && | |
1443 !isMarkedNext(obj); | |
1444 } | |
1445 | |
1446 // Determine if an object is dead, given only the object itself. | |
1447 // This will find the region to which the object belongs and | |
1448 // then call the region version of the same function. | |
1449 | |
1450 // Added if it is in permanent gen it isn't dead. | |
1451 // Added if it is NULL it isn't dead. | |
1452 | |
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1453 // vo == UsePrevMarking -> use "prev" marking information, |
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1454 // vo == UseNextMarking -> use "next" marking information, |
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1455 // vo == UseMarkWord -> use mark word from object header |
811 | 1456 bool is_obj_dead_cond(const oop obj, |
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1457 const VerifyOption vo) const { |
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1458 |
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1459 switch (vo) { |
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1460 case VerifyOption_G1UsePrevMarking: |
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1461 return is_obj_dead(obj); |
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1462 case VerifyOption_G1UseNextMarking: |
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1463 return is_obj_ill(obj); |
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1464 default: |
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1465 assert(vo == VerifyOption_G1UseMarkWord, "must be"); |
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1466 return !obj->is_gc_marked(); |
811 | 1467 } |
1468 } | |
1469 | |
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1470 bool is_obj_dead(const oop obj) const { |
811 | 1471 const HeapRegion* hr = heap_region_containing(obj); |
342 | 1472 if (hr == NULL) { |
1473 if (Universe::heap()->is_in_permanent(obj)) | |
1474 return false; | |
1475 else if (obj == NULL) return false; | |
1476 else return true; | |
1477 } | |
1478 else return is_obj_dead(obj, hr); | |
1479 } | |
1480 | |
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1481 bool is_obj_ill(const oop obj) const { |
811 | 1482 const HeapRegion* hr = heap_region_containing(obj); |
342 | 1483 if (hr == NULL) { |
1484 if (Universe::heap()->is_in_permanent(obj)) | |
1485 return false; | |
1486 else if (obj == NULL) return false; | |
1487 else return true; | |
1488 } | |
1489 else return is_obj_ill(obj, hr); | |
1490 } | |
1491 | |
1492 // The following is just to alert the verification code | |
1493 // that a full collection has occurred and that the | |
1494 // remembered sets are no longer up to date. | |
1495 bool _full_collection; | |
1496 void set_full_collection() { _full_collection = true;} | |
1497 void clear_full_collection() {_full_collection = false;} | |
1498 bool full_collection() {return _full_collection;} | |
1499 | |
1500 ConcurrentMark* concurrent_mark() const { return _cm; } | |
1501 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
1502 | |
796
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1503 // The dirty cards region list is used to record a subset of regions |
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1504 // whose cards need clearing. The list if populated during the |
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1505 // remembered set scanning and drained during the card table |
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1506 // cleanup. Although the methods are reentrant, population/draining |
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1507 // phases must not overlap. For synchronization purposes the last |
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1508 // element on the list points to itself. |
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1509 HeapRegion* _dirty_cards_region_list; |
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1510 void push_dirty_cards_region(HeapRegion* hr); |
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1511 HeapRegion* pop_dirty_cards_region(); |
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1512 |
342 | 1513 public: |
1514 void stop_conc_gc_threads(); | |
1515 | |
1516 // <NEW PREDICTION> | |
1517 | |
1518 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
1519 void check_if_region_is_too_expensive(double predicted_time_ms); | |
1520 size_t pending_card_num(); | |
1521 size_t max_pending_card_num(); | |
1522 size_t cards_scanned(); | |
1523 | |
1524 // </NEW PREDICTION> | |
1525 | |
1526 protected: | |
1527 size_t _max_heap_capacity; | |
1528 }; | |
1529 | |
845
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1530 #define use_local_bitmaps 1 |
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1531 #define verify_local_bitmaps 0 |
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1532 #define oop_buffer_length 256 |
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1533 |
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1534 #ifndef PRODUCT |
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1535 class GCLabBitMap; |
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1536 class GCLabBitMapClosure: public BitMapClosure { |
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1537 private: |
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1538 ConcurrentMark* _cm; |
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1539 GCLabBitMap* _bitmap; |
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1540 |
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1541 public: |
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1542 GCLabBitMapClosure(ConcurrentMark* cm, |
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1543 GCLabBitMap* bitmap) { |
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1544 _cm = cm; |
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1545 _bitmap = bitmap; |
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1546 } |
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1547 |
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1548 virtual bool do_bit(size_t offset); |
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|
1549 }; |
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1550 #endif // !PRODUCT |
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1551 |
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1552 class GCLabBitMap: public BitMap { |
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1553 private: |
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1554 ConcurrentMark* _cm; |
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1555 |
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1556 int _shifter; |
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1557 size_t _bitmap_word_covers_words; |
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1558 |
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1559 // beginning of the heap |
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1560 HeapWord* _heap_start; |
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1561 |
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1562 // this is the actual start of the GCLab |
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1563 HeapWord* _real_start_word; |
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1564 |
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1565 // this is the actual end of the GCLab |
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1566 HeapWord* _real_end_word; |
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1567 |
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1568 // this is the first word, possibly located before the actual start |
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1569 // of the GCLab, that corresponds to the first bit of the bitmap |
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1570 HeapWord* _start_word; |
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1571 |
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1572 // size of a GCLab in words |
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1573 size_t _gclab_word_size; |
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1574 |
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1575 static int shifter() { |
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1576 return MinObjAlignment - 1; |
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1577 } |
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1578 |
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1579 // how many heap words does a single bitmap word corresponds to? |
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1580 static size_t bitmap_word_covers_words() { |
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1581 return BitsPerWord << shifter(); |
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|
1582 } |
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1583 |
1391
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1584 size_t gclab_word_size() const { |
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1585 return _gclab_word_size; |
845
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1586 } |
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1587 |
1391
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1588 // Calculates actual GCLab size in words |
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1589 size_t gclab_real_word_size() const { |
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1590 return bitmap_size_in_bits(pointer_delta(_real_end_word, _start_word)) |
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1591 / BitsPerWord; |
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1592 } |
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1593 |
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1594 static size_t bitmap_size_in_bits(size_t gclab_word_size) { |
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1595 size_t bits_in_bitmap = gclab_word_size >> shifter(); |
845
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1596 // We are going to ensure that the beginning of a word in this |
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1597 // bitmap also corresponds to the beginning of a word in the |
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1598 // global marking bitmap. To handle the case where a GCLab |
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1599 // starts from the middle of the bitmap, we need to add enough |
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1600 // space (i.e. up to a bitmap word) to ensure that we have |
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1601 // enough bits in the bitmap. |
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1602 return bits_in_bitmap + BitsPerWord - 1; |
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1603 } |
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1604 public: |
1391
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1605 GCLabBitMap(HeapWord* heap_start, size_t gclab_word_size) |
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1606 : BitMap(bitmap_size_in_bits(gclab_word_size)), |
845
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1607 _cm(G1CollectedHeap::heap()->concurrent_mark()), |
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changeset
|
1608 _shifter(shifter()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1609 _bitmap_word_covers_words(bitmap_word_covers_words()), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1610 _heap_start(heap_start), |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1611 _gclab_word_size(gclab_word_size), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1612 _real_start_word(NULL), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1613 _real_end_word(NULL), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1614 _start_word(NULL) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1615 { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1616 guarantee( size_in_words() >= bitmap_size_in_words(), |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1617 "just making sure"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1618 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1619 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1620 inline unsigned heapWordToOffset(HeapWord* addr) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1621 unsigned offset = (unsigned) pointer_delta(addr, _start_word) >> _shifter; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1622 assert(offset < size(), "offset should be within bounds"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1623 return offset; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1624 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1625 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1626 inline HeapWord* offsetToHeapWord(size_t offset) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1627 HeapWord* addr = _start_word + (offset << _shifter); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1628 assert(_real_start_word <= addr && addr < _real_end_word, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1629 return addr; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1630 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1631 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1632 bool fields_well_formed() { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1633 bool ret1 = (_real_start_word == NULL) && |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1634 (_real_end_word == NULL) && |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1635 (_start_word == NULL); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1636 if (ret1) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1637 return true; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1638 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1639 bool ret2 = _real_start_word >= _start_word && |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1640 _start_word < _real_end_word && |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1641 (_real_start_word + _gclab_word_size) == _real_end_word && |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1642 (_start_word + _gclab_word_size + _bitmap_word_covers_words) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1643 > _real_end_word; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1644 return ret2; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1645 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1646 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1647 inline bool mark(HeapWord* addr) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1648 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1649 assert(fields_well_formed(), "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1650 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1651 if (addr >= _real_start_word && addr < _real_end_word) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1652 assert(!isMarked(addr), "should not have already been marked"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1653 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1654 // first mark it on the bitmap |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1655 at_put(heapWordToOffset(addr), true); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1656 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1657 return true; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1658 } else { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1659 return false; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1660 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1661 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1662 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1663 inline bool isMarked(HeapWord* addr) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1664 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1665 assert(fields_well_formed(), "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1666 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1667 return at(heapWordToOffset(addr)); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1668 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1669 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1670 void set_buffer(HeapWord* start) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1671 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1672 clear(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1673 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1674 assert(start != NULL, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1675 _real_start_word = start; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1676 _real_end_word = start + _gclab_word_size; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1677 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1678 size_t diff = |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1679 pointer_delta(start, _heap_start) % _bitmap_word_covers_words; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1680 _start_word = start - diff; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1681 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1682 assert(fields_well_formed(), "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1683 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1684 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1685 #ifndef PRODUCT |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1686 void verify() { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1687 // verify that the marks have been propagated |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1688 GCLabBitMapClosure cl(_cm, this); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1689 iterate(&cl); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1690 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1691 #endif // PRODUCT |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1692 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1693 void retire() { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1694 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1695 assert(fields_well_formed(), "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1696 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1697 if (_start_word != NULL) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1698 CMBitMap* mark_bitmap = _cm->nextMarkBitMap(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1699 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1700 // this means that the bitmap was set up for the GCLab |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1701 assert(_real_start_word != NULL && _real_end_word != NULL, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1702 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1703 mark_bitmap->mostly_disjoint_range_union(this, |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1704 0, // always start from the start of the bitmap |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1705 _start_word, |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1706 gclab_real_word_size()); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1707 _cm->grayRegionIfNecessary(MemRegion(_real_start_word, _real_end_word)); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1708 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1709 #ifndef PRODUCT |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1710 if (use_local_bitmaps && verify_local_bitmaps) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1711 verify(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1712 #endif // PRODUCT |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1713 } else { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1714 assert(_real_start_word == NULL && _real_end_word == NULL, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1715 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1716 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1717 |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1718 size_t bitmap_size_in_words() const { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1719 return (bitmap_size_in_bits(gclab_word_size()) + BitsPerWord - 1) / BitsPerWord; |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1720 } |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1721 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1722 }; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1723 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1724 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1725 private: |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1726 bool _retired; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1727 bool _during_marking; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1728 GCLabBitMap _bitmap; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1729 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1730 public: |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1731 G1ParGCAllocBuffer(size_t gclab_word_size) : |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1732 ParGCAllocBuffer(gclab_word_size), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1733 _during_marking(G1CollectedHeap::heap()->mark_in_progress()), |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1734 _bitmap(G1CollectedHeap::heap()->reserved_region().start(), gclab_word_size), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1735 _retired(false) |
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1736 { } |
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1737 |
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1738 inline bool mark(HeapWord* addr) { |
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1739 guarantee(use_local_bitmaps, "invariant"); |
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1740 assert(_during_marking, "invariant"); |
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1741 return _bitmap.mark(addr); |
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1742 } |
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1743 |
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1744 inline void set_buf(HeapWord* buf) { |
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1745 if (use_local_bitmaps && _during_marking) |
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1746 _bitmap.set_buffer(buf); |
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1747 ParGCAllocBuffer::set_buf(buf); |
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1748 _retired = false; |
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1749 } |
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1750 |
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1751 inline void retire(bool end_of_gc, bool retain) { |
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1752 if (_retired) |
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1753 return; |
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1754 if (use_local_bitmaps && _during_marking) { |
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1755 _bitmap.retire(); |
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1756 } |
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1757 ParGCAllocBuffer::retire(end_of_gc, retain); |
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1758 _retired = true; |
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1759 } |
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1760 }; |
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1761 |
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1762 class G1ParScanThreadState : public StackObj { |
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1763 protected: |
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1764 G1CollectedHeap* _g1h; |
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1765 RefToScanQueue* _refs; |
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1766 DirtyCardQueue _dcq; |
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1767 CardTableModRefBS* _ct_bs; |
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1768 G1RemSet* _g1_rem; |
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1769 |
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1770 G1ParGCAllocBuffer _surviving_alloc_buffer; |
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1771 G1ParGCAllocBuffer _tenured_alloc_buffer; |
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1772 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount]; |
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1773 ageTable _age_table; |
845
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1774 |
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1775 size_t _alloc_buffer_waste; |
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1776 size_t _undo_waste; |
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1777 |
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1778 OopsInHeapRegionClosure* _evac_failure_cl; |
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1779 G1ParScanHeapEvacClosure* _evac_cl; |
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1780 G1ParScanPartialArrayClosure* _partial_scan_cl; |
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1781 |
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1782 int _hash_seed; |
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1783 int _queue_num; |
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1784 |
1611 | 1785 size_t _term_attempts; |
845
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1786 |
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1787 double _start; |
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1788 double _start_strong_roots; |
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1789 double _strong_roots_time; |
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1790 double _start_term; |
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1791 double _term_time; |
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1792 |
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1793 // Map from young-age-index (0 == not young, 1 is youngest) to |
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1794 // surviving words. base is what we get back from the malloc call |
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1795 size_t* _surviving_young_words_base; |
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1796 // this points into the array, as we use the first few entries for padding |
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1797 size_t* _surviving_young_words; |
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1798 |
1709 | 1799 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
845
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1800 |
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1801 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1802 |
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1803 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1804 |
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1805 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
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1806 CardTableModRefBS* ctbs() { return _ct_bs; } |
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1807 |
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1808 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
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1809 if (!from->is_survivor()) { |
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1810 _g1_rem->par_write_ref(from, p, tid); |
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1811 } |
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1812 } |
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1813 |
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1814 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1815 // If the new value of the field points to the same region or |
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1816 // is the to-space, we don't need to include it in the Rset updates. |
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1817 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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1818 size_t card_index = ctbs()->index_for(p); |
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1819 // If the card hasn't been added to the buffer, do it. |
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1820 if (ctbs()->mark_card_deferred(card_index)) { |
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1821 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1822 } |
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1823 } |
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1824 } |
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1825 |
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1826 public: |
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1827 G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num); |
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1828 |
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1829 ~G1ParScanThreadState() { |
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1830 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base); |
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1831 } |
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1832 |
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1833 RefToScanQueue* refs() { return _refs; } |
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1834 ageTable* age_table() { return &_age_table; } |
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1835 |
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1836 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
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1837 return _alloc_buffers[purpose]; |
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1838 } |
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1839 |
1709 | 1840 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
1841 size_t undo_waste() const { return _undo_waste; } | |
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1842 |
1862
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1843 #ifdef ASSERT |
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1844 bool verify_ref(narrowOop* ref) const; |
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1845 bool verify_ref(oop* ref) const; |
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1846 bool verify_task(StarTask ref) const; |
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1847 #endif // ASSERT |
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1848 |
845
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1849 template <class T> void push_on_queue(T* ref) { |
1862
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1850 assert(verify_ref(ref), "sanity"); |
1709 | 1851 refs()->push(ref); |
845
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1852 } |
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1853 |
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1854 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
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1855 if (G1DeferredRSUpdate) { |
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1856 deferred_rs_update(from, p, tid); |
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1857 } else { |
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1858 immediate_rs_update(from, p, tid); |
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1859 } |
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1860 } |
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1861 |
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1862 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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1863 |
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1864 HeapWord* obj = NULL; |
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1865 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
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1866 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
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1867 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
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1868 assert(gclab_word_size == alloc_buf->word_sz(), |
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1869 "dynamic resizing is not supported"); |
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1870 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
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1871 alloc_buf->retire(false, false); |
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1872 |
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1873 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
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1874 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
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1875 // Otherwise. |
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1876 alloc_buf->set_buf(buf); |
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1877 |
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1878 obj = alloc_buf->allocate(word_sz); |
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1879 assert(obj != NULL, "buffer was definitely big enough..."); |
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1880 } else { |
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1881 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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1882 } |
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1883 return obj; |
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1884 } |
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1885 |
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1886 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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1887 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1888 if (obj != NULL) return obj; |
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1889 return allocate_slow(purpose, word_sz); |
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1890 } |
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1891 |
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1892 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
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1893 if (alloc_buffer(purpose)->contains(obj)) { |
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1894 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
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1895 "should contain whole object"); |
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1896 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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1897 } else { |
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1898 CollectedHeap::fill_with_object(obj, word_sz); |
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1899 add_to_undo_waste(word_sz); |
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1900 } |
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1901 } |
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1902 |
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1903 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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1904 _evac_failure_cl = evac_failure_cl; |
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1905 } |
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1906 OopsInHeapRegionClosure* evac_failure_closure() { |
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1907 return _evac_failure_cl; |
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1908 } |
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1909 |
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1910 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
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1911 _evac_cl = evac_cl; |
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1912 } |
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1913 |
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1914 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
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1915 _partial_scan_cl = partial_scan_cl; |
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1916 } |
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1917 |
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1918 int* hash_seed() { return &_hash_seed; } |
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1919 int queue_num() { return _queue_num; } |
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1920 |
1709 | 1921 size_t term_attempts() const { return _term_attempts; } |
1611 | 1922 void note_term_attempt() { _term_attempts++; } |
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1923 |
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1924 void start_strong_roots() { |
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1925 _start_strong_roots = os::elapsedTime(); |
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1926 } |
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1927 void end_strong_roots() { |
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1928 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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1929 } |
1709 | 1930 double strong_roots_time() const { return _strong_roots_time; } |
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1931 |
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1932 void start_term_time() { |
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1933 note_term_attempt(); |
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1934 _start_term = os::elapsedTime(); |
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1935 } |
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1936 void end_term_time() { |
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1937 _term_time += (os::elapsedTime() - _start_term); |
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1938 } |
1709 | 1939 double term_time() const { return _term_time; } |
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1940 |
1709 | 1941 double elapsed_time() const { |
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1942 return os::elapsedTime() - _start; |
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1943 } |
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1944 |
1709 | 1945 static void |
1946 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
1947 void | |
1948 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
1949 | |
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1950 size_t* surviving_young_words() { |
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1951 // We add on to hide entry 0 which accumulates surviving words for |
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1952 // age -1 regions (i.e. non-young ones) |
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1953 return _surviving_young_words; |
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1954 } |
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1955 |
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1956 void retire_alloc_buffers() { |
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1957 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
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1958 size_t waste = _alloc_buffers[ap]->words_remaining(); |
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1959 add_to_alloc_buffer_waste(waste); |
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1960 _alloc_buffers[ap]->retire(true, false); |
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1961 } |
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1962 } |
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1963 |
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1964 template <class T> void deal_with_reference(T* ref_to_scan) { |
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1965 if (has_partial_array_mask(ref_to_scan)) { |
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1966 _partial_scan_cl->do_oop_nv(ref_to_scan); |
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1967 } else { |
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1968 // Note: we can use "raw" versions of "region_containing" because |
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1969 // "obj_to_scan" is definitely in the heap, and is not in a |
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1970 // humongous region. |
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1971 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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1972 _evac_cl->set_region(r); |
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1973 _evac_cl->do_oop_nv(ref_to_scan); |
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1974 } |
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1975 } |
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1976 |
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1977 void deal_with_reference(StarTask ref) { |
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1978 assert(verify_task(ref), "sanity"); |
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1979 if (ref.is_narrow()) { |
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1980 deal_with_reference((narrowOop*)ref); |
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1981 } else { |
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1982 deal_with_reference((oop*)ref); |
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1983 } |
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1984 } |
1862
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1985 |
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1986 public: |
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1987 void trim_queue(); |
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1988 }; |
1972 | 1989 |
1990 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |