Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 3823:14a2fd14c0db
7068240: G1: Long "parallel other time" and "ext root scanning" when running specific benchmark
Summary: In root processing, move the scanning of the reference processor's discovered lists to before RSet updating and scanning. When scanning the reference processor's discovered lists, use a buffering closure so that the time spent copying any reference object is correctly attributed. Also removed a couple of unused and irrelevant timers.
Reviewed-by: ysr, jmasa
author | johnc |
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date | Mon, 01 Aug 2011 10:04:28 -0700 |
parents | 5f6f2615433a |
children | f44782f04dd4 |
rev | line source |
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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 |
342 | 158 class RefineCardTableEntryClosure; |
159 class G1CollectedHeap : public SharedHeap { | |
160 friend class VM_G1CollectForAllocation; | |
161 friend class VM_GenCollectForPermanentAllocation; | |
162 friend class VM_G1CollectFull; | |
163 friend class VM_G1IncCollectionPause; | |
164 friend class VMStructs; | |
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165 friend class MutatorAllocRegion; |
342 | 166 |
167 // Closures used in implementation. | |
168 friend class G1ParCopyHelper; | |
169 friend class G1IsAliveClosure; | |
170 friend class G1EvacuateFollowersClosure; | |
171 friend class G1ParScanThreadState; | |
172 friend class G1ParScanClosureSuper; | |
173 friend class G1ParEvacuateFollowersClosure; | |
174 friend class G1ParTask; | |
175 friend class G1FreeGarbageRegionClosure; | |
176 friend class RefineCardTableEntryClosure; | |
177 friend class G1PrepareCompactClosure; | |
178 friend class RegionSorter; | |
2152 | 179 friend class RegionResetter; |
342 | 180 friend class CountRCClosure; |
181 friend class EvacPopObjClosure; | |
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182 friend class G1ParCleanupCTTask; |
342 | 183 |
184 // Other related classes. | |
185 friend class G1MarkSweep; | |
186 | |
187 private: | |
188 // The one and only G1CollectedHeap, so static functions can find it. | |
189 static G1CollectedHeap* _g1h; | |
190 | |
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191 static size_t _humongous_object_threshold_in_words; |
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192 |
342 | 193 // Storage for the G1 heap (excludes the permanent generation). |
194 VirtualSpace _g1_storage; | |
195 MemRegion _g1_reserved; | |
196 | |
197 // The part of _g1_storage that is currently committed. | |
198 MemRegion _g1_committed; | |
199 | |
2152 | 200 // The master free list. It will satisfy all new region allocations. |
201 MasterFreeRegionList _free_list; | |
202 | |
203 // The secondary free list which contains regions that have been | |
204 // freed up during the cleanup process. This will be appended to the | |
205 // master free list when appropriate. | |
206 SecondaryFreeRegionList _secondary_free_list; | |
207 | |
208 // It keeps track of the humongous regions. | |
209 MasterHumongousRegionSet _humongous_set; | |
342 | 210 |
211 // The number of regions we could create by expansion. | |
212 size_t _expansion_regions; | |
213 | |
214 // The block offset table for the G1 heap. | |
215 G1BlockOffsetSharedArray* _bot_shared; | |
216 | |
217 // Move all of the regions off the free lists, then rebuild those free | |
218 // lists, before and after full GC. | |
219 void tear_down_region_lists(); | |
220 void rebuild_region_lists(); | |
221 | |
222 // The sequence of all heap regions in the heap. | |
3766 | 223 HeapRegionSeq _hrs; |
342 | 224 |
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225 // Alloc region used to satisfy mutator allocation requests. |
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226 MutatorAllocRegion _mutator_alloc_region; |
342 | 227 |
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228 // It resets the mutator alloc region before new allocations can take place. |
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229 void init_mutator_alloc_region(); |
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230 |
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231 // It releases the mutator alloc region. |
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232 void release_mutator_alloc_region(); |
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233 |
636 | 234 void abandon_gc_alloc_regions(); |
342 | 235 |
236 // The to-space memory regions into which objects are being copied during | |
237 // a GC. | |
238 HeapRegion* _gc_alloc_regions[GCAllocPurposeCount]; | |
545 | 239 size_t _gc_alloc_region_counts[GCAllocPurposeCount]; |
636 | 240 // These are the regions, one per GCAllocPurpose, that are half-full |
241 // at the end of a collection and that we want to reuse during the | |
242 // next collection. | |
243 HeapRegion* _retained_gc_alloc_regions[GCAllocPurposeCount]; | |
244 // This specifies whether we will keep the last half-full region at | |
245 // the end of a collection so that it can be reused during the next | |
246 // collection (this is specified per GCAllocPurpose) | |
247 bool _retain_gc_alloc_region[GCAllocPurposeCount]; | |
342 | 248 |
249 // A list of the regions that have been set to be alloc regions in the | |
250 // current collection. | |
251 HeapRegion* _gc_alloc_region_list; | |
252 | |
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253 // Helper for monitoring and management support. |
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254 G1MonitoringSupport* _g1mm; |
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255 |
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256 // Determines PLAB size for a particular allocation purpose. |
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257 static size_t desired_plab_sz(GCAllocPurpose purpose); |
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258 |
2152 | 259 // When called by par thread, requires the FreeList_lock to be held. |
342 | 260 void push_gc_alloc_region(HeapRegion* hr); |
261 | |
262 // This should only be called single-threaded. Undeclares all GC alloc | |
263 // regions. | |
264 void forget_alloc_region_list(); | |
265 | |
266 // Should be used to set an alloc region, because there's other | |
267 // associated bookkeeping. | |
268 void set_gc_alloc_region(int purpose, HeapRegion* r); | |
269 | |
270 // Check well-formedness of alloc region list. | |
271 bool check_gc_alloc_regions(); | |
272 | |
273 // Outside of GC pauses, the number of bytes used in all regions other | |
274 // than the current allocation region. | |
275 size_t _summary_bytes_used; | |
276 | |
526 | 277 // This is used for a quick test on whether a reference points into |
278 // the collection set or not. Basically, we have an array, with one | |
279 // byte per region, and that byte denotes whether the corresponding | |
280 // region is in the collection set or not. The entry corresponding | |
281 // the bottom of the heap, i.e., region 0, is pointed to by | |
282 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
283 // biased so that it actually points to address 0 of the address | |
284 // space, to make the test as fast as possible (we can simply shift | |
285 // the address to address into it, instead of having to subtract the | |
286 // bottom of the heap from the address before shifting it; basically | |
287 // it works in the same way the card table works). | |
288 bool* _in_cset_fast_test; | |
289 | |
290 // The allocated array used for the fast test on whether a reference | |
291 // points into the collection set or not. This field is also used to | |
292 // free the array. | |
293 bool* _in_cset_fast_test_base; | |
294 | |
295 // The length of the _in_cset_fast_test_base array. | |
296 size_t _in_cset_fast_test_length; | |
297 | |
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298 volatile unsigned _gc_time_stamp; |
342 | 299 |
300 size_t* _surviving_young_words; | |
301 | |
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302 G1HRPrinter _hr_printer; |
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303 |
342 | 304 void setup_surviving_young_words(); |
305 void update_surviving_young_words(size_t* surv_young_words); | |
306 void cleanup_surviving_young_words(); | |
307 | |
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308 // It decides whether an explicit GC should start a concurrent cycle |
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309 // instead of doing a STW GC. Currently, a concurrent cycle is |
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310 // explicitly started if: |
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311 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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312 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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313 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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314 |
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315 // Keeps track of how many "full collections" (i.e., Full GCs or |
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316 // concurrent cycles) we have completed. The number of them we have |
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317 // started is maintained in _total_full_collections in CollectedHeap. |
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318 volatile unsigned int _full_collections_completed; |
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319 |
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320 // This is a non-product method that is helpful for testing. It is |
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321 // called at the end of a GC and artificially expands the heap by |
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322 // allocating a number of dead regions. This way we can induce very |
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323 // frequent marking cycles and stress the cleanup / concurrent |
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324 // cleanup code more (as all the regions that will be allocated by |
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325 // this method will be found dead by the marking cycle). |
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326 void allocate_dummy_regions() PRODUCT_RETURN; |
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327 |
1973 | 328 // These are macros so that, if the assert fires, we get the correct |
329 // line number, file, etc. | |
330 | |
2361 | 331 #define heap_locking_asserts_err_msg(_extra_message_) \ |
2152 | 332 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
2361 | 333 (_extra_message_), \ |
2152 | 334 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
335 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
336 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
1973 | 337 |
338 #define assert_heap_locked() \ | |
339 do { \ | |
340 assert(Heap_lock->owned_by_self(), \ | |
341 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
342 } while (0) | |
343 | |
2361 | 344 #define assert_heap_locked_or_at_safepoint(_should_be_vm_thread_) \ |
1973 | 345 do { \ |
346 assert(Heap_lock->owned_by_self() || \ | |
2152 | 347 (SafepointSynchronize::is_at_safepoint() && \ |
2361 | 348 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread())), \ |
1973 | 349 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
350 "should be at a safepoint")); \ | |
351 } while (0) | |
352 | |
353 #define assert_heap_locked_and_not_at_safepoint() \ | |
354 do { \ | |
355 assert(Heap_lock->owned_by_self() && \ | |
356 !SafepointSynchronize::is_at_safepoint(), \ | |
357 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
358 "should not be at a safepoint")); \ | |
359 } while (0) | |
360 | |
361 #define assert_heap_not_locked() \ | |
362 do { \ | |
363 assert(!Heap_lock->owned_by_self(), \ | |
364 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
365 } while (0) | |
366 | |
367 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
368 do { \ | |
369 assert(!Heap_lock->owned_by_self() && \ | |
370 !SafepointSynchronize::is_at_safepoint(), \ | |
371 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
372 "should not be at a safepoint")); \ | |
373 } while (0) | |
374 | |
2361 | 375 #define assert_at_safepoint(_should_be_vm_thread_) \ |
1973 | 376 do { \ |
2152 | 377 assert(SafepointSynchronize::is_at_safepoint() && \ |
2361 | 378 ((_should_be_vm_thread_) == Thread::current()->is_VM_thread()), \ |
1973 | 379 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
380 } while (0) | |
381 | |
382 #define assert_not_at_safepoint() \ | |
383 do { \ | |
384 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
385 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
386 } while (0) | |
387 | |
342 | 388 protected: |
389 | |
390 // Returns "true" iff none of the gc alloc regions have any allocations | |
391 // since the last call to "save_marks". | |
392 bool all_alloc_regions_no_allocs_since_save_marks(); | |
545 | 393 // Perform finalization stuff on all allocation regions. |
394 void retire_all_alloc_regions(); | |
342 | 395 |
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396 // The young region list. |
342 | 397 YoungList* _young_list; |
398 | |
399 // The current policy object for the collector. | |
400 G1CollectorPolicy* _g1_policy; | |
401 | |
2152 | 402 // This is the second level of trying to allocate a new region. If |
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403 // new_region() didn't find a region on the free_list, this call will |
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404 // check whether there's anything available on the |
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405 // secondary_free_list and/or wait for more regions to appear on |
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406 // that list, if _free_regions_coming is set. |
2361 | 407 HeapRegion* new_region_try_secondary_free_list(); |
342 | 408 |
2361 | 409 // Try to allocate a single non-humongous HeapRegion sufficient for |
410 // an allocation of the given word_size. If do_expand is true, | |
411 // attempt to expand the heap if necessary to satisfy the allocation | |
412 // request. | |
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413 HeapRegion* new_region(size_t word_size, bool do_expand); |
342 | 414 |
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415 // Try to allocate a new region to be used for allocation by |
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416 // a GC thread. It will try to expand the heap if no region is |
2361 | 417 // available. |
2152 | 418 HeapRegion* new_gc_alloc_region(int purpose, size_t word_size); |
419 | |
2361 | 420 // Attempt to satisfy a humongous allocation request of the given |
421 // size by finding a contiguous set of free regions of num_regions | |
422 // length and remove them from the master free list. Return the | |
3766 | 423 // index of the first region or G1_NULL_HRS_INDEX if the search |
424 // was unsuccessful. | |
425 size_t humongous_obj_allocate_find_first(size_t num_regions, | |
426 size_t word_size); | |
342 | 427 |
2361 | 428 // Initialize a contiguous set of free regions of length num_regions |
429 // and starting at index first so that they appear as a single | |
430 // humongous region. | |
3766 | 431 HeapWord* humongous_obj_allocate_initialize_regions(size_t first, |
2361 | 432 size_t num_regions, |
433 size_t word_size); | |
434 | |
435 // Attempt to allocate a humongous object of the given size. Return | |
436 // NULL if unsuccessful. | |
2152 | 437 HeapWord* humongous_obj_allocate(size_t word_size); |
1973 | 438 |
439 // The following two methods, allocate_new_tlab() and | |
440 // mem_allocate(), are the two main entry points from the runtime | |
441 // into the G1's allocation routines. They have the following | |
442 // assumptions: | |
443 // | |
444 // * They should both be called outside safepoints. | |
445 // | |
446 // * They should both be called without holding the Heap_lock. | |
447 // | |
448 // * All allocation requests for new TLABs should go to | |
449 // allocate_new_tlab(). | |
450 // | |
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451 // * All non-TLAB allocation requests should go to mem_allocate(). |
1973 | 452 // |
453 // * If either call cannot satisfy the allocation request using the | |
454 // current allocating region, they will try to get a new one. If | |
455 // this fails, they will attempt to do an evacuation pause and | |
456 // retry the allocation. | |
457 // | |
458 // * If all allocation attempts fail, even after trying to schedule | |
459 // an evacuation pause, allocate_new_tlab() will return NULL, | |
460 // whereas mem_allocate() will attempt a heap expansion and/or | |
461 // schedule a Full GC. | |
462 // | |
463 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
464 // should never be called with word_size being humongous. All | |
465 // humongous allocation requests should go to mem_allocate() which | |
466 // will satisfy them with a special path. | |
467 | |
468 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
469 | |
470 virtual HeapWord* mem_allocate(size_t word_size, | |
471 bool* gc_overhead_limit_was_exceeded); | |
342 | 472 |
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473 // The following three methods take a gc_count_before_ret |
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474 // parameter which is used to return the GC count if the method |
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475 // returns NULL. Given that we are required to read the GC count |
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476 // while holding the Heap_lock, and these paths will take the |
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477 // Heap_lock at some point, it's easier to get them to read the GC |
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478 // count while holding the Heap_lock before they return NULL instead |
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479 // of the caller (namely: mem_allocate()) having to also take the |
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480 // Heap_lock just to read the GC count. |
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481 |
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482 // First-level mutator allocation attempt: try to allocate out of |
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483 // the mutator alloc region without taking the Heap_lock. This |
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484 // should only be used for non-humongous allocations. |
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485 inline HeapWord* attempt_allocation(size_t word_size, |
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486 unsigned int* gc_count_before_ret); |
342 | 487 |
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488 // Second-level mutator allocation attempt: take the Heap_lock and |
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489 // retry the allocation attempt, potentially scheduling a GC |
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490 // pause. This should only be used for non-humongous allocations. |
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491 HeapWord* attempt_allocation_slow(size_t word_size, |
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492 unsigned int* gc_count_before_ret); |
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493 |
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494 // Takes the Heap_lock and attempts a humongous allocation. It can |
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495 // potentially schedule a GC pause. |
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496 HeapWord* attempt_allocation_humongous(size_t word_size, |
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497 unsigned int* gc_count_before_ret); |
1973 | 498 |
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499 // Allocation attempt that should be called during safepoints (e.g., |
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500 // at the end of a successful GC). expect_null_mutator_alloc_region |
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501 // specifies whether the mutator alloc region is expected to be NULL |
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502 // or not. |
1973 | 503 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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504 bool expect_null_mutator_alloc_region); |
1973 | 505 |
506 // It dirties the cards that cover the block so that so that the post | |
507 // write barrier never queues anything when updating objects on this | |
508 // block. It is assumed (and in fact we assert) that the block | |
509 // belongs to a young region. | |
510 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
342 | 511 |
512 // Allocate blocks during garbage collection. Will ensure an | |
513 // allocation region, either by picking one or expanding the | |
514 // heap, and then allocate a block of the given size. The block | |
515 // may not be a humongous - it must fit into a single heap region. | |
516 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
517 | |
518 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, | |
519 HeapRegion* alloc_region, | |
520 bool par, | |
521 size_t word_size); | |
522 | |
523 // Ensure that no further allocations can happen in "r", bearing in mind | |
524 // that parallel threads might be attempting allocations. | |
525 void par_allocate_remaining_space(HeapRegion* r); | |
526 | |
545 | 527 // Retires an allocation region when it is full or at the end of a |
528 // GC pause. | |
529 void retire_alloc_region(HeapRegion* alloc_region, bool par); | |
530 | |
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531 // These two methods are the "callbacks" from the G1AllocRegion class. |
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532 |
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533 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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534 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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535 size_t allocated_bytes); |
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536 |
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537 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
1973 | 538 // inspection request and should collect the entire heap |
539 // - if clear_all_soft_refs is true, all soft references should be | |
540 // cleared during the GC | |
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541 // - if explicit_gc is false, word_size describes the allocation that |
1973 | 542 // the GC should attempt (at least) to satisfy |
543 // - it returns false if it is unable to do the collection due to the | |
544 // GC locker being active, true otherwise | |
545 bool do_collection(bool explicit_gc, | |
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546 bool clear_all_soft_refs, |
342 | 547 size_t word_size); |
548 | |
549 // Callback from VM_G1CollectFull operation. | |
550 // Perform a full collection. | |
551 void do_full_collection(bool clear_all_soft_refs); | |
552 | |
553 // Resize the heap if necessary after a full collection. If this is | |
554 // after a collect-for allocation, "word_size" is the allocation size, | |
555 // and will be considered part of the used portion of the heap. | |
556 void resize_if_necessary_after_full_collection(size_t word_size); | |
557 | |
558 // Callback from VM_G1CollectForAllocation operation. | |
559 // This function does everything necessary/possible to satisfy a | |
560 // failed allocation request (including collection, expansion, etc.) | |
1973 | 561 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
342 | 562 |
563 // Attempting to expand the heap sufficiently | |
564 // to support an allocation of the given "word_size". If | |
565 // successful, perform the allocation and return the address of the | |
566 // allocated block, or else "NULL". | |
1973 | 567 HeapWord* expand_and_allocate(size_t word_size); |
342 | 568 |
569 public: | |
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570 |
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571 G1MonitoringSupport* g1mm() { return _g1mm; } |
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572 |
342 | 573 // Expand the garbage-first heap by at least the given size (in bytes!). |
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574 // Returns true if the heap was expanded by the requested amount; |
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575 // false otherwise. |
342 | 576 // (Rounds up to a HeapRegion boundary.) |
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577 bool expand(size_t expand_bytes); |
342 | 578 |
579 // Do anything common to GC's. | |
580 virtual void gc_prologue(bool full); | |
581 virtual void gc_epilogue(bool full); | |
582 | |
526 | 583 // We register a region with the fast "in collection set" test. We |
584 // simply set to true the array slot corresponding to this region. | |
585 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
586 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
587 assert(r->in_collection_set(), "invariant"); | |
3766 | 588 size_t index = r->hrs_index(); |
589 assert(index < _in_cset_fast_test_length, "invariant"); | |
526 | 590 assert(!_in_cset_fast_test_base[index], "invariant"); |
591 _in_cset_fast_test_base[index] = true; | |
592 } | |
593 | |
594 // This is a fast test on whether a reference points into the | |
595 // collection set or not. It does not assume that the reference | |
596 // points into the heap; if it doesn't, it will return false. | |
597 bool in_cset_fast_test(oop obj) { | |
598 assert(_in_cset_fast_test != NULL, "sanity"); | |
599 if (_g1_committed.contains((HeapWord*) obj)) { | |
600 // no need to subtract the bottom of the heap from obj, | |
601 // _in_cset_fast_test is biased | |
602 size_t index = ((size_t) obj) >> HeapRegion::LogOfHRGrainBytes; | |
603 bool ret = _in_cset_fast_test[index]; | |
604 // let's make sure the result is consistent with what the slower | |
605 // test returns | |
606 assert( ret || !obj_in_cs(obj), "sanity"); | |
607 assert(!ret || obj_in_cs(obj), "sanity"); | |
608 return ret; | |
609 } else { | |
610 return false; | |
611 } | |
612 } | |
613 | |
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614 void clear_cset_fast_test() { |
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615 assert(_in_cset_fast_test_base != NULL, "sanity"); |
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616 memset(_in_cset_fast_test_base, false, |
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617 _in_cset_fast_test_length * sizeof(bool)); |
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618 } |
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619 |
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620 // This is called at the end of either a concurrent cycle or a Full |
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621 // GC to update the number of full collections completed. Those two |
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622 // can happen in a nested fashion, i.e., we start a concurrent |
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623 // cycle, a Full GC happens half-way through it which ends first, |
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624 // and then the cycle notices that a Full GC happened and ends |
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625 // too. The concurrent parameter is a boolean to help us do a bit |
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626 // tighter consistency checking in the method. If concurrent is |
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627 // false, the caller is the inner caller in the nesting (i.e., the |
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628 // Full GC). If concurrent is true, the caller is the outer caller |
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629 // in this nesting (i.e., the concurrent cycle). Further nesting is |
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630 // not currently supported. The end of the this call also notifies |
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631 // the FullGCCount_lock in case a Java thread is waiting for a full |
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632 // GC to happen (e.g., it called System.gc() with |
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633 // +ExplicitGCInvokesConcurrent). |
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634 void increment_full_collections_completed(bool concurrent); |
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635 |
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636 unsigned int full_collections_completed() { |
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637 return _full_collections_completed; |
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638 } |
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639 |
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640 G1HRPrinter* hr_printer() { return &_hr_printer; } |
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641 |
342 | 642 protected: |
643 | |
644 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
645 // (Rounds down to a HeapRegion boundary.) | |
646 virtual void shrink(size_t expand_bytes); | |
647 void shrink_helper(size_t expand_bytes); | |
648 | |
1709 | 649 #if TASKQUEUE_STATS |
650 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
651 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
652 void reset_taskqueue_stats(); | |
653 #endif // TASKQUEUE_STATS | |
654 | |
1973 | 655 // Schedule the VM operation that will do an evacuation pause to |
656 // satisfy an allocation request of word_size. *succeeded will | |
657 // return whether the VM operation was successful (it did do an | |
658 // evacuation pause) or not (another thread beat us to it or the GC | |
659 // locker was active). Given that we should not be holding the | |
660 // Heap_lock when we enter this method, we will pass the | |
661 // gc_count_before (i.e., total_collections()) as a parameter since | |
662 // it has to be read while holding the Heap_lock. Currently, both | |
663 // methods that call do_collection_pause() release the Heap_lock | |
664 // before the call, so it's easy to read gc_count_before just before. | |
665 HeapWord* do_collection_pause(size_t word_size, | |
666 unsigned int gc_count_before, | |
667 bool* succeeded); | |
342 | 668 |
669 // The guts of the incremental collection pause, executed by the vm | |
1973 | 670 // thread. It returns false if it is unable to do the collection due |
671 // to the GC locker being active, true otherwise | |
672 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
342 | 673 |
674 // Actually do the work of evacuating the collection set. | |
1973 | 675 void evacuate_collection_set(); |
342 | 676 |
677 // The g1 remembered set of the heap. | |
678 G1RemSet* _g1_rem_set; | |
679 // And it's mod ref barrier set, used to track updates for the above. | |
680 ModRefBarrierSet* _mr_bs; | |
681 | |
616
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682 // A set of cards that cover the objects for which the Rsets should be updated |
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683 // concurrently after the collection. |
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684 DirtyCardQueueSet _dirty_card_queue_set; |
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685 |
342 | 686 // The Heap Region Rem Set Iterator. |
687 HeapRegionRemSetIterator** _rem_set_iterator; | |
688 | |
689 // The closure used to refine a single card. | |
690 RefineCardTableEntryClosure* _refine_cte_cl; | |
691 | |
692 // A function to check the consistency of dirty card logs. | |
693 void check_ct_logs_at_safepoint(); | |
694 | |
1705 | 695 // A DirtyCardQueueSet that is used to hold cards that contain |
696 // references into the current collection set. This is used to | |
697 // update the remembered sets of the regions in the collection | |
698 // set in the event of an evacuation failure. | |
699 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
700 | |
342 | 701 // After a collection pause, make the regions in the CS into free |
702 // regions. | |
703 void free_collection_set(HeapRegion* cs_head); | |
704 | |
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705 // Abandon the current collection set without recording policy |
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706 // statistics or updating free lists. |
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707 void abandon_collection_set(HeapRegion* cs_head); |
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708 |
342 | 709 // Applies "scan_non_heap_roots" to roots outside the heap, |
710 // "scan_rs" to roots inside the heap (having done "set_region" to | |
711 // indicate the region in which the root resides), and does "scan_perm" | |
712 // (setting the generation to the perm generation.) If "scan_rs" is | |
713 // NULL, then this step is skipped. The "worker_i" | |
714 // param is for use with parallel roots processing, and should be | |
715 // the "i" of the calling parallel worker thread's work(i) function. | |
716 // In the sequential case this param will be ignored. | |
717 void g1_process_strong_roots(bool collecting_perm_gen, | |
718 SharedHeap::ScanningOption so, | |
719 OopClosure* scan_non_heap_roots, | |
720 OopsInHeapRegionClosure* scan_rs, | |
721 OopsInGenClosure* scan_perm, | |
722 int worker_i); | |
723 | |
724 // Apply "blk" to all the weak roots of the system. These include | |
725 // JNI weak roots, the code cache, system dictionary, symbol table, | |
726 // string table, and referents of reachable weak refs. | |
727 void g1_process_weak_roots(OopClosure* root_closure, | |
728 OopClosure* non_root_closure); | |
729 | |
730 // Invoke "save_marks" on all heap regions. | |
731 void save_marks(); | |
732 | |
2361 | 733 // Frees a non-humongous region by initializing its contents and |
2152 | 734 // adding it to the free list that's passed as a parameter (this is |
735 // usually a local list which will be appended to the master free | |
736 // list later). The used bytes of freed regions are accumulated in | |
737 // pre_used. If par is true, the region's RSet will not be freed | |
738 // up. The assumption is that this will be done later. | |
739 void free_region(HeapRegion* hr, | |
740 size_t* pre_used, | |
741 FreeRegionList* free_list, | |
742 bool par); | |
342 | 743 |
2361 | 744 // Frees a humongous region by collapsing it into individual regions |
745 // and calling free_region() for each of them. The freed regions | |
746 // will be added to the free list that's passed as a parameter (this | |
747 // is usually a local list which will be appended to the master free | |
748 // list later). The used bytes of freed regions are accumulated in | |
749 // pre_used. If par is true, the region's RSet will not be freed | |
750 // up. The assumption is that this will be done later. | |
2152 | 751 void free_humongous_region(HeapRegion* hr, |
752 size_t* pre_used, | |
753 FreeRegionList* free_list, | |
754 HumongousRegionSet* humongous_proxy_set, | |
755 bool par); | |
342 | 756 |
3766 | 757 // Notifies all the necessary spaces that the committed space has |
758 // been updated (either expanded or shrunk). It should be called | |
759 // after _g1_storage is updated. | |
760 void update_committed_space(HeapWord* old_end, HeapWord* new_end); | |
761 | |
342 | 762 // The concurrent marker (and the thread it runs in.) |
763 ConcurrentMark* _cm; | |
764 ConcurrentMarkThread* _cmThread; | |
765 bool _mark_in_progress; | |
766 | |
767 // The concurrent refiner. | |
768 ConcurrentG1Refine* _cg1r; | |
769 | |
770 // The parallel task queues | |
771 RefToScanQueueSet *_task_queues; | |
772 | |
773 // True iff a evacuation has failed in the current collection. | |
774 bool _evacuation_failed; | |
775 | |
776 // Set the attribute indicating whether evacuation has failed in the | |
777 // current collection. | |
778 void set_evacuation_failed(bool b) { _evacuation_failed = b; } | |
779 | |
780 // Failed evacuations cause some logical from-space objects to have | |
781 // forwarding pointers to themselves. Reset them. | |
782 void remove_self_forwarding_pointers(); | |
783 | |
784 // When one is non-null, so is the other. Together, they each pair is | |
785 // an object with a preserved mark, and its mark value. | |
786 GrowableArray<oop>* _objs_with_preserved_marks; | |
787 GrowableArray<markOop>* _preserved_marks_of_objs; | |
788 | |
789 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
790 // word being overwritten with a self-forwarding-pointer. | |
791 void preserve_mark_if_necessary(oop obj, markOop m); | |
792 | |
793 // The stack of evac-failure objects left to be scanned. | |
794 GrowableArray<oop>* _evac_failure_scan_stack; | |
795 // The closure to apply to evac-failure objects. | |
796 | |
797 OopsInHeapRegionClosure* _evac_failure_closure; | |
798 // Set the field above. | |
799 void | |
800 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
801 _evac_failure_closure = evac_failure_closure; | |
802 } | |
803 | |
804 // Push "obj" on the scan stack. | |
805 void push_on_evac_failure_scan_stack(oop obj); | |
806 // Process scan stack entries until the stack is empty. | |
807 void drain_evac_failure_scan_stack(); | |
808 // True iff an invocation of "drain_scan_stack" is in progress; to | |
809 // prevent unnecessary recursion. | |
810 bool _drain_in_progress; | |
811 | |
812 // Do any necessary initialization for evacuation-failure handling. | |
813 // "cl" is the closure that will be used to process evac-failure | |
814 // objects. | |
815 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
816 // Do any necessary cleanup for evacuation-failure handling data | |
817 // structures. | |
818 void finalize_for_evac_failure(); | |
819 | |
820 // An attempt to evacuate "obj" has failed; take necessary steps. | |
821 oop handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, oop obj); | |
822 void handle_evacuation_failure_common(oop obj, markOop m); | |
823 | |
824 // Ensure that the relevant gc_alloc regions are set. | |
825 void get_gc_alloc_regions(); | |
636 | 826 // We're done with GC alloc regions. We are going to tear down the |
827 // gc alloc list and remove the gc alloc tag from all the regions on | |
828 // that list. However, we will also retain the last (i.e., the one | |
829 // that is half-full) GC alloc region, per GCAllocPurpose, for | |
830 // possible reuse during the next collection, provided | |
831 // _retain_gc_alloc_region[] indicates that it should be the | |
832 // case. Said regions are kept in the _retained_gc_alloc_regions[] | |
833 // array. If the parameter totally is set, we will not retain any | |
834 // regions, irrespective of what _retain_gc_alloc_region[] | |
835 // indicates. | |
836 void release_gc_alloc_regions(bool totally); | |
837 #ifndef PRODUCT | |
838 // Useful for debugging. | |
839 void print_gc_alloc_regions(); | |
840 #endif // !PRODUCT | |
342 | 841 |
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842 // Instance of the concurrent mark is_alive closure for embedding |
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843 // into the reference processor as the is_alive_non_header. This |
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844 // prevents unnecessary additions to the discovered lists during |
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845 // concurrent discovery. |
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846 G1CMIsAliveClosure _is_alive_closure; |
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847 |
342 | 848 // ("Weak") Reference processing support |
849 ReferenceProcessor* _ref_processor; | |
850 | |
851 enum G1H_process_strong_roots_tasks { | |
852 G1H_PS_mark_stack_oops_do, | |
853 G1H_PS_refProcessor_oops_do, | |
854 // Leave this one last. | |
855 G1H_PS_NumElements | |
856 }; | |
857 | |
858 SubTasksDone* _process_strong_tasks; | |
859 | |
2152 | 860 volatile bool _free_regions_coming; |
342 | 861 |
862 public: | |
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863 |
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864 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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865 |
342 | 866 void set_refine_cte_cl_concurrency(bool concurrent); |
867 | |
1709 | 868 RefToScanQueue *task_queue(int i) const; |
342 | 869 |
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870 // A set of cards where updates happened during the GC |
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871 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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872 |
1705 | 873 // A DirtyCardQueueSet that is used to hold cards that contain |
874 // references into the current collection set. This is used to | |
875 // update the remembered sets of the regions in the collection | |
876 // set in the event of an evacuation failure. | |
877 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
878 { return _into_cset_dirty_card_queue_set; } | |
879 | |
342 | 880 // Create a G1CollectedHeap with the specified policy. |
881 // Must call the initialize method afterwards. | |
882 // May not return if something goes wrong. | |
883 G1CollectedHeap(G1CollectorPolicy* policy); | |
884 | |
885 // Initialize the G1CollectedHeap to have the initial and | |
886 // maximum sizes, permanent generation, and remembered and barrier sets | |
887 // specified by the policy object. | |
888 jint initialize(); | |
889 | |
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890 virtual void ref_processing_init(); |
342 | 891 |
892 void set_par_threads(int t) { | |
893 SharedHeap::set_par_threads(t); | |
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894 _process_strong_tasks->set_n_threads(t); |
342 | 895 } |
896 | |
897 virtual CollectedHeap::Name kind() const { | |
898 return CollectedHeap::G1CollectedHeap; | |
899 } | |
900 | |
901 // The current policy object for the collector. | |
902 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
903 | |
904 // Adaptive size policy. No such thing for g1. | |
905 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
906 | |
907 // The rem set and barrier set. | |
908 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
909 ModRefBarrierSet* mr_bs() const { return _mr_bs; } | |
910 | |
911 // The rem set iterator. | |
912 HeapRegionRemSetIterator* rem_set_iterator(int i) { | |
913 return _rem_set_iterator[i]; | |
914 } | |
915 | |
916 HeapRegionRemSetIterator* rem_set_iterator() { | |
917 return _rem_set_iterator[0]; | |
918 } | |
919 | |
920 unsigned get_gc_time_stamp() { | |
921 return _gc_time_stamp; | |
922 } | |
923 | |
924 void reset_gc_time_stamp() { | |
925 _gc_time_stamp = 0; | |
353
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926 OrderAccess::fence(); |
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927 } |
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928 |
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929 void increment_gc_time_stamp() { |
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930 ++_gc_time_stamp; |
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931 OrderAccess::fence(); |
342 | 932 } |
933 | |
1705 | 934 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
935 DirtyCardQueue* into_cset_dcq, | |
936 bool concurrent, int worker_i); | |
342 | 937 |
938 // The shared block offset table array. | |
939 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
940 | |
941 // Reference Processing accessor | |
942 ReferenceProcessor* ref_processor() { return _ref_processor; } | |
943 | |
944 virtual size_t capacity() const; | |
945 virtual size_t used() const; | |
846
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946 // This should be called when we're not holding the heap lock. The |
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947 // result might be a bit inaccurate. |
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948 size_t used_unlocked() const; |
342 | 949 size_t recalculate_used() const; |
950 #ifndef PRODUCT | |
951 size_t recalculate_used_regions() const; | |
952 #endif // PRODUCT | |
953 | |
954 // These virtual functions do the actual allocation. | |
955 // Some heaps may offer a contiguous region for shared non-blocking | |
956 // allocation, via inlined code (by exporting the address of the top and | |
957 // end fields defining the extent of the contiguous allocation region.) | |
958 // But G1CollectedHeap doesn't yet support this. | |
959 | |
960 // Return an estimate of the maximum allocation that could be performed | |
961 // without triggering any collection or expansion activity. In a | |
962 // generational collector, for example, this is probably the largest | |
963 // allocation that could be supported (without expansion) in the youngest | |
964 // generation. It is "unsafe" because no locks are taken; the result | |
965 // should be treated as an approximation, not a guarantee, for use in | |
966 // heuristic resizing decisions. | |
967 virtual size_t unsafe_max_alloc(); | |
968 | |
969 virtual bool is_maximal_no_gc() const { | |
970 return _g1_storage.uncommitted_size() == 0; | |
971 } | |
972 | |
973 // The total number of regions in the heap. | |
3766 | 974 size_t n_regions() { return _hrs.length(); } |
975 | |
976 // The max number of regions in the heap. | |
977 size_t max_regions() { return _hrs.max_length(); } | |
342 | 978 |
979 // The number of regions that are completely free. | |
3766 | 980 size_t free_regions() { return _free_list.length(); } |
342 | 981 |
982 // The number of regions that are not completely free. | |
983 size_t used_regions() { return n_regions() - free_regions(); } | |
984 | |
985 // The number of regions available for "regular" expansion. | |
986 size_t expansion_regions() { return _expansion_regions; } | |
987 | |
3766 | 988 // Factory method for HeapRegion instances. It will return NULL if |
989 // the allocation fails. | |
990 HeapRegion* new_heap_region(size_t hrs_index, HeapWord* bottom); | |
991 | |
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992 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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993 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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994 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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995 void verify_dirty_young_regions() PRODUCT_RETURN; |
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996 |
2152 | 997 // verify_region_sets() performs verification over the region |
998 // lists. It will be compiled in the product code to be used when | |
999 // necessary (i.e., during heap verification). | |
1000 void verify_region_sets(); | |
342 | 1001 |
2152 | 1002 // verify_region_sets_optional() is planted in the code for |
1003 // list verification in non-product builds (and it can be enabled in | |
1004 // product builds by definning HEAP_REGION_SET_FORCE_VERIFY to be 1). | |
1005 #if HEAP_REGION_SET_FORCE_VERIFY | |
1006 void verify_region_sets_optional() { | |
1007 verify_region_sets(); | |
1008 } | |
1009 #else // HEAP_REGION_SET_FORCE_VERIFY | |
1010 void verify_region_sets_optional() { } | |
1011 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
342 | 1012 |
2152 | 1013 #ifdef ASSERT |
2361 | 1014 bool is_on_master_free_list(HeapRegion* hr) { |
2152 | 1015 return hr->containing_set() == &_free_list; |
1016 } | |
342 | 1017 |
2361 | 1018 bool is_in_humongous_set(HeapRegion* hr) { |
2152 | 1019 return hr->containing_set() == &_humongous_set; |
2361 | 1020 } |
2152 | 1021 #endif // ASSERT |
342 | 1022 |
2152 | 1023 // Wrapper for the region list operations that can be called from |
1024 // methods outside this class. | |
342 | 1025 |
2152 | 1026 void secondary_free_list_add_as_tail(FreeRegionList* list) { |
1027 _secondary_free_list.add_as_tail(list); | |
1028 } | |
342 | 1029 |
2152 | 1030 void append_secondary_free_list() { |
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1031 _free_list.add_as_head(&_secondary_free_list); |
2152 | 1032 } |
342 | 1033 |
2361 | 1034 void append_secondary_free_list_if_not_empty_with_lock() { |
1035 // If the secondary free list looks empty there's no reason to | |
1036 // take the lock and then try to append it. | |
2152 | 1037 if (!_secondary_free_list.is_empty()) { |
1038 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
1039 append_secondary_free_list(); | |
1040 } | |
1041 } | |
342 | 1042 |
2152 | 1043 void set_free_regions_coming(); |
1044 void reset_free_regions_coming(); | |
1045 bool free_regions_coming() { return _free_regions_coming; } | |
1046 void wait_while_free_regions_coming(); | |
342 | 1047 |
1048 // Perform a collection of the heap; intended for use in implementing | |
1049 // "System.gc". This probably implies as full a collection as the | |
1050 // "CollectedHeap" supports. | |
1051 virtual void collect(GCCause::Cause cause); | |
1052 | |
1053 // The same as above but assume that the caller holds the Heap_lock. | |
1054 void collect_locked(GCCause::Cause cause); | |
1055 | |
1056 // This interface assumes that it's being called by the | |
1057 // vm thread. It collects the heap assuming that the | |
1058 // heap lock is already held and that we are executing in | |
1059 // the context of the vm thread. | |
1060 virtual void collect_as_vm_thread(GCCause::Cause cause); | |
1061 | |
1062 // True iff a evacuation has failed in the most-recent collection. | |
1063 bool evacuation_failed() { return _evacuation_failed; } | |
1064 | |
2152 | 1065 // It will free a region if it has allocated objects in it that are |
1066 // all dead. It calls either free_region() or | |
1067 // free_humongous_region() depending on the type of the region that | |
1068 // is passed to it. | |
2173 | 1069 void free_region_if_empty(HeapRegion* hr, |
1070 size_t* pre_used, | |
1071 FreeRegionList* free_list, | |
1072 HumongousRegionSet* humongous_proxy_set, | |
1073 HRRSCleanupTask* hrrs_cleanup_task, | |
1074 bool par); | |
342 | 1075 |
2152 | 1076 // It appends the free list to the master free list and updates the |
1077 // master humongous list according to the contents of the proxy | |
1078 // list. It also adjusts the total used bytes according to pre_used | |
1079 // (if par is true, it will do so by taking the ParGCRareEvent_lock). | |
1080 void update_sets_after_freeing_regions(size_t pre_used, | |
1081 FreeRegionList* free_list, | |
1082 HumongousRegionSet* humongous_proxy_set, | |
1083 bool par); | |
342 | 1084 |
1085 // Returns "TRUE" iff "p" points into the allocated area of the heap. | |
1086 virtual bool is_in(const void* p) const; | |
1087 | |
1088 // Return "TRUE" iff the given object address is within the collection | |
1089 // set. | |
1090 inline bool obj_in_cs(oop obj); | |
1091 | |
1092 // Return "TRUE" iff the given object address is in the reserved | |
1093 // region of g1 (excluding the permanent generation). | |
1094 bool is_in_g1_reserved(const void* p) const { | |
1095 return _g1_reserved.contains(p); | |
1096 } | |
1097 | |
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1098 // Returns a MemRegion that corresponds to the space that has been |
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1099 // reserved for the heap |
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1100 MemRegion g1_reserved() { |
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1101 return _g1_reserved; |
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1102 } |
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1103 |
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1104 // Returns a MemRegion that corresponds to the space that has been |
342 | 1105 // committed in the heap |
1106 MemRegion g1_committed() { | |
1107 return _g1_committed; | |
1108 } | |
1109 | |
2311 | 1110 virtual bool is_in_closed_subset(const void* p) const; |
342 | 1111 |
1112 // Dirty card table entries covering a list of young regions. | |
1113 void dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list); | |
1114 | |
1115 // This resets the card table to all zeros. It is used after | |
1116 // a collection pause which used the card table to claim cards. | |
1117 void cleanUpCardTable(); | |
1118 | |
1119 // Iteration functions. | |
1120 | |
1121 // Iterate over all the ref-containing fields of all objects, calling | |
1122 // "cl.do_oop" on each. | |
678 | 1123 virtual void oop_iterate(OopClosure* cl) { |
1124 oop_iterate(cl, true); | |
1125 } | |
1126 void oop_iterate(OopClosure* cl, bool do_perm); | |
342 | 1127 |
1128 // Same as above, restricted to a memory region. | |
678 | 1129 virtual void oop_iterate(MemRegion mr, OopClosure* cl) { |
1130 oop_iterate(mr, cl, true); | |
1131 } | |
1132 void oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm); | |
342 | 1133 |
1134 // Iterate over all objects, calling "cl.do_object" on each. | |
678 | 1135 virtual void object_iterate(ObjectClosure* cl) { |
1136 object_iterate(cl, true); | |
1137 } | |
1138 virtual void safe_object_iterate(ObjectClosure* cl) { | |
1139 object_iterate(cl, true); | |
1140 } | |
1141 void object_iterate(ObjectClosure* cl, bool do_perm); | |
342 | 1142 |
1143 // Iterate over all objects allocated since the last collection, calling | |
1144 // "cl.do_object" on each. The heap must have been initialized properly | |
1145 // to support this function, or else this call will fail. | |
1146 virtual void object_iterate_since_last_GC(ObjectClosure* cl); | |
1147 | |
1148 // Iterate over all spaces in use in the heap, in ascending address order. | |
1149 virtual void space_iterate(SpaceClosure* cl); | |
1150 | |
1151 // Iterate over heap regions, in address order, terminating the | |
1152 // iteration early if the "doHeapRegion" method returns "true". | |
3766 | 1153 void heap_region_iterate(HeapRegionClosure* blk) const; |
342 | 1154 |
1155 // Iterate over heap regions starting with r (or the first region if "r" | |
1156 // is NULL), in address order, terminating early if the "doHeapRegion" | |
1157 // method returns "true". | |
3766 | 1158 void heap_region_iterate_from(HeapRegion* r, HeapRegionClosure* blk) const; |
342 | 1159 |
3766 | 1160 // Return the region with the given index. It assumes the index is valid. |
1161 HeapRegion* region_at(size_t index) const { return _hrs.at(index); } | |
342 | 1162 |
1163 // Divide the heap region sequence into "chunks" of some size (the number | |
1164 // of regions divided by the number of parallel threads times some | |
1165 // overpartition factor, currently 4). Assumes that this will be called | |
1166 // in parallel by ParallelGCThreads worker threads with discinct worker | |
1167 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
1168 // calls will use the same "claim_value", and that that claim value is | |
1169 // different from the claim_value of any heap region before the start of | |
1170 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
1171 // attempting to claim the first region in each chunk, and, if | |
1172 // successful, applying the closure to each region in the chunk (and | |
1173 // setting the claim value of the second and subsequent regions of the | |
1174 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
1175 // i.e., that a closure never attempt to abort a traversal. | |
1176 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
1177 int worker, | |
1178 jint claim_value); | |
1179 | |
390 | 1180 // It resets all the region claim values to the default. |
1181 void reset_heap_region_claim_values(); | |
1182 | |
355 | 1183 #ifdef ASSERT |
1184 bool check_heap_region_claim_values(jint claim_value); | |
1185 #endif // ASSERT | |
1186 | |
342 | 1187 // Iterate over the regions (if any) in the current collection set. |
1188 void collection_set_iterate(HeapRegionClosure* blk); | |
1189 | |
1190 // As above but starting from region r | |
1191 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
1192 | |
1193 // Returns the first (lowest address) compactible space in the heap. | |
1194 virtual CompactibleSpace* first_compactible_space(); | |
1195 | |
1196 // A CollectedHeap will contain some number of spaces. This finds the | |
1197 // space containing a given address, or else returns NULL. | |
1198 virtual Space* space_containing(const void* addr) const; | |
1199 | |
1200 // A G1CollectedHeap will contain some number of heap regions. This | |
1201 // finds the region containing a given address, or else returns NULL. | |
3766 | 1202 template <class T> |
1203 inline HeapRegion* heap_region_containing(const T addr) const; | |
342 | 1204 |
1205 // Like the above, but requires "addr" to be in the heap (to avoid a | |
1206 // null-check), and unlike the above, may return an continuing humongous | |
1207 // region. | |
3766 | 1208 template <class T> |
1209 inline HeapRegion* heap_region_containing_raw(const T addr) const; | |
342 | 1210 |
1211 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
1212 // each address in the (reserved) heap is a member of exactly | |
1213 // one block. The defining characteristic of a block is that it is | |
1214 // possible to find its size, and thus to progress forward to the next | |
1215 // block. (Blocks may be of different sizes.) Thus, blocks may | |
1216 // represent Java objects, or they might be free blocks in a | |
1217 // free-list-based heap (or subheap), as long as the two kinds are | |
1218 // distinguishable and the size of each is determinable. | |
1219 | |
1220 // Returns the address of the start of the "block" that contains the | |
1221 // address "addr". We say "blocks" instead of "object" since some heaps | |
1222 // may not pack objects densely; a chunk may either be an object or a | |
1223 // non-object. | |
1224 virtual HeapWord* block_start(const void* addr) const; | |
1225 | |
1226 // Requires "addr" to be the start of a chunk, and returns its size. | |
1227 // "addr + size" is required to be the start of a new chunk, or the end | |
1228 // of the active area of the heap. | |
1229 virtual size_t block_size(const HeapWord* addr) const; | |
1230 | |
1231 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
1232 // the block is an object. | |
1233 virtual bool block_is_obj(const HeapWord* addr) const; | |
1234 | |
1235 // Does this heap support heap inspection? (+PrintClassHistogram) | |
1236 virtual bool supports_heap_inspection() const { return true; } | |
1237 | |
1238 // Section on thread-local allocation buffers (TLABs) | |
1239 // See CollectedHeap for semantics. | |
1240 | |
1241 virtual bool supports_tlab_allocation() const; | |
1242 virtual size_t tlab_capacity(Thread* thr) const; | |
1243 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
1244 | |
1245 // Can a compiler initialize a new object without store barriers? | |
1246 // This permission only extends from the creation of a new object | |
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1247 // via a TLAB up to the first subsequent safepoint. If such permission |
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1248 // is granted for this heap type, the compiler promises to call |
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1249 // defer_store_barrier() below on any slow path allocation of |
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1250 // a new object for which such initializing store barriers will |
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1251 // have been elided. G1, like CMS, allows this, but should be |
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1252 // ready to provide a compensating write barrier as necessary |
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1253 // if that storage came out of a non-young region. The efficiency |
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1254 // of this implementation depends crucially on being able to |
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1255 // answer very efficiently in constant time whether a piece of |
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1256 // storage in the heap comes from a young region or not. |
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1257 // See ReduceInitialCardMarks. |
342 | 1258 virtual bool can_elide_tlab_store_barriers() const { |
1194
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1259 // 6920090: Temporarily disabled, because of lingering |
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1260 // instabilities related to RICM with G1. In the |
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1261 // interim, the option ReduceInitialCardMarksForG1 |
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1262 // below is left solely as a debugging device at least |
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1263 // until 6920109 fixes the instabilities. |
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1264 return ReduceInitialCardMarksForG1; |
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1265 } |
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1266 |
1166 | 1267 virtual bool card_mark_must_follow_store() const { |
1268 return true; | |
1269 } | |
1270 | |
3766 | 1271 bool is_in_young(const oop obj) { |
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1272 HeapRegion* hr = heap_region_containing(obj); |
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1273 return hr != NULL && hr->is_young(); |
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1274 } |
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1275 |
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1276 #ifdef ASSERT |
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1277 virtual bool is_in_partial_collection(const void* p); |
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1278 #endif |
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1279 |
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1280 virtual bool is_scavengable(const void* addr); |
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1281 |
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1282 // We don't need barriers for initializing stores to objects |
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1283 // in the young gen: for the SATB pre-barrier, there is no |
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1284 // pre-value that needs to be remembered; for the remembered-set |
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1285 // update logging post-barrier, we don't maintain remembered set |
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1286 // information for young gen objects. Note that non-generational |
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1287 // G1 does not have any "young" objects, should not elide |
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1288 // the rs logging barrier and so should always answer false below. |
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1289 // However, non-generational G1 (-XX:-G1Gen) appears to have |
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1290 // bit-rotted so was not tested below. |
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1291 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
1194
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1292 // Re 6920090, 6920109 above. |
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1293 assert(ReduceInitialCardMarksForG1, "Else cannot be here"); |
1027
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1294 assert(G1Gen || !is_in_young(new_obj), |
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1295 "Non-generational G1 should never return true below"); |
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1296 return is_in_young(new_obj); |
342 | 1297 } |
1298 | |
1299 // Can a compiler elide a store barrier when it writes | |
1300 // a permanent oop into the heap? Applies when the compiler | |
1301 // is storing x to the heap, where x->is_perm() is true. | |
1302 virtual bool can_elide_permanent_oop_store_barriers() const { | |
1303 // At least until perm gen collection is also G1-ified, at | |
1304 // which point this should return false. | |
1305 return true; | |
1306 } | |
1307 | |
1308 // Returns "true" iff the given word_size is "very large". | |
1309 static bool isHumongous(size_t word_size) { | |
1313
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1310 // Note this has to be strictly greater-than as the TLABs |
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1311 // are capped at the humongous thresold and we want to |
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1312 // ensure that we don't try to allocate a TLAB as |
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1313 // humongous and that we don't allocate a humongous |
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1314 // object in a TLAB. |
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1315 return word_size > _humongous_object_threshold_in_words; |
342 | 1316 } |
1317 | |
1318 // Update mod union table with the set of dirty cards. | |
1319 void updateModUnion(); | |
1320 | |
1321 // Set the mod union bits corresponding to the given memRegion. Note | |
1322 // that this is always a safe operation, since it doesn't clear any | |
1323 // bits. | |
1324 void markModUnionRange(MemRegion mr); | |
1325 | |
1326 // Records the fact that a marking phase is no longer in progress. | |
1327 void set_marking_complete() { | |
1328 _mark_in_progress = false; | |
1329 } | |
1330 void set_marking_started() { | |
1331 _mark_in_progress = true; | |
1332 } | |
1333 bool mark_in_progress() { | |
1334 return _mark_in_progress; | |
1335 } | |
1336 | |
1337 // Print the maximum heap capacity. | |
1338 virtual size_t max_capacity() const; | |
1339 | |
1340 virtual jlong millis_since_last_gc(); | |
1341 | |
1342 // Perform any cleanup actions necessary before allowing a verification. | |
1343 virtual void prepare_for_verify(); | |
1344 | |
1345 // Perform verification. | |
811 | 1346 |
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1347 // vo == UsePrevMarking -> use "prev" marking information, |
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1348 // vo == UseNextMarking -> use "next" marking information |
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1349 // vo == UseMarkWord -> use the mark word in the object header |
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1350 // |
811 | 1351 // NOTE: Only the "prev" marking information is guaranteed to be |
1352 // consistent most of the time, so most calls to this should use | |
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1353 // vo == UsePrevMarking. |
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1354 // Currently, there is only one case where this is called with |
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1355 // vo == UseNextMarking, which is to verify the "next" marking |
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1356 // information at the end of remark. |
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1357 // Currently there is only one place where this is called with |
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1358 // vo == UseMarkWord, which is to verify the marking during a |
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1359 // full GC. |
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1360 void verify(bool allow_dirty, bool silent, VerifyOption vo); |
811 | 1361 |
1362 // Override; it uses the "prev" marking information | |
342 | 1363 virtual void verify(bool allow_dirty, bool silent); |
838
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1364 // Default behavior by calling print(tty); |
342 | 1365 virtual void print() const; |
838
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1366 // This calls print_on(st, PrintHeapAtGCExtended). |
342 | 1367 virtual void print_on(outputStream* st) const; |
838
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1368 // If extended is true, it will print out information for all |
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1369 // regions in the heap by calling print_on_extended(st). |
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1370 virtual void print_on(outputStream* st, bool extended) const; |
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1371 virtual void print_on_extended(outputStream* st) const; |
342 | 1372 |
1373 virtual void print_gc_threads_on(outputStream* st) const; | |
1374 virtual void gc_threads_do(ThreadClosure* tc) const; | |
1375 | |
1376 // Override | |
1377 void print_tracing_info() const; | |
1378 | |
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1379 // The following two methods are helpful for debugging RSet issues. |
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1380 void print_cset_rsets() PRODUCT_RETURN; |
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1381 void print_all_rsets() PRODUCT_RETURN; |
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1382 |
342 | 1383 // Convenience function to be used in situations where the heap type can be |
1384 // asserted to be this type. | |
1385 static G1CollectedHeap* heap(); | |
1386 | |
1387 void empty_young_list(); | |
1388 | |
1389 void set_region_short_lived_locked(HeapRegion* hr); | |
1390 // add appropriate methods for any other surv rate groups | |
1391 | |
1394
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1392 YoungList* young_list() { return _young_list; } |
342 | 1393 |
1394 // debugging | |
1395 bool check_young_list_well_formed() { | |
1396 return _young_list->check_list_well_formed(); | |
1397 } | |
1394
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1398 |
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1399 bool check_young_list_empty(bool check_heap, |
342 | 1400 bool check_sample = true); |
1401 | |
1402 // *** Stuff related to concurrent marking. It's not clear to me that so | |
1403 // many of these need to be public. | |
1404 | |
1405 // The functions below are helper functions that a subclass of | |
1406 // "CollectedHeap" can use in the implementation of its virtual | |
1407 // functions. | |
1408 // This performs a concurrent marking of the live objects in a | |
1409 // bitmap off to the side. | |
1410 void doConcurrentMark(); | |
1411 | |
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1412 // Do a full concurrent marking, synchronously. |
342 | 1413 void do_sync_mark(); |
1414 | |
1415 bool isMarkedPrev(oop obj) const; | |
1416 bool isMarkedNext(oop obj) const; | |
1417 | |
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1418 // vo == UsePrevMarking -> use "prev" marking information, |
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1419 // vo == UseNextMarking -> use "next" marking information, |
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1420 // vo == UseMarkWord -> use mark word from object header |
811 | 1421 bool is_obj_dead_cond(const oop obj, |
1422 const HeapRegion* hr, | |
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1423 const VerifyOption vo) const { |
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1424 |
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1425 switch (vo) { |
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1426 case VerifyOption_G1UsePrevMarking: |
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1427 return is_obj_dead(obj, hr); |
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1428 case VerifyOption_G1UseNextMarking: |
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1429 return is_obj_ill(obj, hr); |
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1430 default: |
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1431 assert(vo == VerifyOption_G1UseMarkWord, "must be"); |
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1432 return !obj->is_gc_marked(); |
811 | 1433 } |
1434 } | |
1435 | |
342 | 1436 // Determine if an object is dead, given the object and also |
1437 // the region to which the object belongs. An object is dead | |
1438 // iff a) it was not allocated since the last mark and b) it | |
1439 // is not marked. | |
1440 | |
1441 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
1442 return | |
1443 !hr->obj_allocated_since_prev_marking(obj) && | |
1444 !isMarkedPrev(obj); | |
1445 } | |
1446 | |
1447 // This is used when copying an object to survivor space. | |
1448 // If the object is marked live, then we mark the copy live. | |
1449 // If the object is allocated since the start of this mark | |
1450 // cycle, then we mark the copy live. | |
1451 // If the object has been around since the previous mark | |
1452 // phase, and hasn't been marked yet during this phase, | |
1453 // then we don't mark it, we just wait for the | |
1454 // current marking cycle to get to it. | |
1455 | |
1456 // This function returns true when an object has been | |
1457 // around since the previous marking and hasn't yet | |
1458 // been marked during this marking. | |
1459 | |
1460 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
1461 return | |
1462 !hr->obj_allocated_since_next_marking(obj) && | |
1463 !isMarkedNext(obj); | |
1464 } | |
1465 | |
1466 // Determine if an object is dead, given only the object itself. | |
1467 // This will find the region to which the object belongs and | |
1468 // then call the region version of the same function. | |
1469 | |
1470 // Added if it is in permanent gen it isn't dead. | |
1471 // Added if it is NULL it isn't dead. | |
1472 | |
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1473 // vo == UsePrevMarking -> use "prev" marking information, |
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1474 // vo == UseNextMarking -> use "next" marking information, |
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1475 // vo == UseMarkWord -> use mark word from object header |
811 | 1476 bool is_obj_dead_cond(const oop obj, |
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1477 const VerifyOption vo) const { |
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1478 |
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1479 switch (vo) { |
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1480 case VerifyOption_G1UsePrevMarking: |
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1481 return is_obj_dead(obj); |
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1482 case VerifyOption_G1UseNextMarking: |
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1483 return is_obj_ill(obj); |
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1484 default: |
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1485 assert(vo == VerifyOption_G1UseMarkWord, "must be"); |
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1486 return !obj->is_gc_marked(); |
811 | 1487 } |
1488 } | |
1489 | |
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1490 bool is_obj_dead(const oop obj) const { |
811 | 1491 const HeapRegion* hr = heap_region_containing(obj); |
342 | 1492 if (hr == NULL) { |
1493 if (Universe::heap()->is_in_permanent(obj)) | |
1494 return false; | |
1495 else if (obj == NULL) return false; | |
1496 else return true; | |
1497 } | |
1498 else return is_obj_dead(obj, hr); | |
1499 } | |
1500 | |
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1501 bool is_obj_ill(const oop obj) const { |
811 | 1502 const HeapRegion* hr = heap_region_containing(obj); |
342 | 1503 if (hr == NULL) { |
1504 if (Universe::heap()->is_in_permanent(obj)) | |
1505 return false; | |
1506 else if (obj == NULL) return false; | |
1507 else return true; | |
1508 } | |
1509 else return is_obj_ill(obj, hr); | |
1510 } | |
1511 | |
1512 // The following is just to alert the verification code | |
1513 // that a full collection has occurred and that the | |
1514 // remembered sets are no longer up to date. | |
1515 bool _full_collection; | |
1516 void set_full_collection() { _full_collection = true;} | |
1517 void clear_full_collection() {_full_collection = false;} | |
1518 bool full_collection() {return _full_collection;} | |
1519 | |
1520 ConcurrentMark* concurrent_mark() const { return _cm; } | |
1521 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
1522 | |
796
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1523 // The dirty cards region list is used to record a subset of regions |
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1524 // whose cards need clearing. The list if populated during the |
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1525 // remembered set scanning and drained during the card table |
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1526 // cleanup. Although the methods are reentrant, population/draining |
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1527 // phases must not overlap. For synchronization purposes the last |
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1528 // element on the list points to itself. |
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1529 HeapRegion* _dirty_cards_region_list; |
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1530 void push_dirty_cards_region(HeapRegion* hr); |
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1531 HeapRegion* pop_dirty_cards_region(); |
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1532 |
342 | 1533 public: |
1534 void stop_conc_gc_threads(); | |
1535 | |
1536 // <NEW PREDICTION> | |
1537 | |
1538 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
1539 void check_if_region_is_too_expensive(double predicted_time_ms); | |
1540 size_t pending_card_num(); | |
1541 size_t max_pending_card_num(); | |
1542 size_t cards_scanned(); | |
1543 | |
1544 // </NEW PREDICTION> | |
1545 | |
1546 protected: | |
1547 size_t _max_heap_capacity; | |
1548 }; | |
1549 | |
845
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1550 #define use_local_bitmaps 1 |
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1551 #define verify_local_bitmaps 0 |
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1552 #define oop_buffer_length 256 |
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1553 |
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1554 #ifndef PRODUCT |
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1555 class GCLabBitMap; |
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1556 class GCLabBitMapClosure: public BitMapClosure { |
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1557 private: |
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1558 ConcurrentMark* _cm; |
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1559 GCLabBitMap* _bitmap; |
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1560 |
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1561 public: |
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1562 GCLabBitMapClosure(ConcurrentMark* cm, |
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1563 GCLabBitMap* bitmap) { |
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1564 _cm = cm; |
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1565 _bitmap = bitmap; |
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1566 } |
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1567 |
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1568 virtual bool do_bit(size_t offset); |
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1569 }; |
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1570 #endif // !PRODUCT |
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1571 |
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1572 class GCLabBitMap: public BitMap { |
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1573 private: |
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1574 ConcurrentMark* _cm; |
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1575 |
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1576 int _shifter; |
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1577 size_t _bitmap_word_covers_words; |
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1578 |
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1579 // beginning of the heap |
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1580 HeapWord* _heap_start; |
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1581 |
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1582 // this is the actual start of the GCLab |
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1583 HeapWord* _real_start_word; |
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1584 |
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1585 // this is the actual end of the GCLab |
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1586 HeapWord* _real_end_word; |
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1587 |
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1588 // this is the first word, possibly located before the actual start |
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1589 // of the GCLab, that corresponds to the first bit of the bitmap |
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1590 HeapWord* _start_word; |
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1591 |
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1592 // size of a GCLab in words |
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1593 size_t _gclab_word_size; |
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1594 |
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1595 static int shifter() { |
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1596 return MinObjAlignment - 1; |
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1597 } |
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1598 |
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1599 // how many heap words does a single bitmap word corresponds to? |
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1600 static size_t bitmap_word_covers_words() { |
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1601 return BitsPerWord << shifter(); |
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1602 } |
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1603 |
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1604 size_t gclab_word_size() const { |
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1605 return _gclab_word_size; |
845
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1606 } |
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1607 |
1391
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1608 // Calculates actual GCLab size in words |
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1609 size_t gclab_real_word_size() const { |
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1610 return bitmap_size_in_bits(pointer_delta(_real_end_word, _start_word)) |
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1611 / BitsPerWord; |
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1612 } |
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1613 |
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1614 static size_t bitmap_size_in_bits(size_t gclab_word_size) { |
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1615 size_t bits_in_bitmap = gclab_word_size >> shifter(); |
845
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1616 // We are going to ensure that the beginning of a word in this |
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1617 // bitmap also corresponds to the beginning of a word in the |
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1618 // global marking bitmap. To handle the case where a GCLab |
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1619 // starts from the middle of the bitmap, we need to add enough |
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1620 // space (i.e. up to a bitmap word) to ensure that we have |
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1621 // enough bits in the bitmap. |
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1622 return bits_in_bitmap + BitsPerWord - 1; |
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1623 } |
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1624 public: |
1391
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1625 GCLabBitMap(HeapWord* heap_start, size_t gclab_word_size) |
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1626 : BitMap(bitmap_size_in_bits(gclab_word_size)), |
845
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1627 _cm(G1CollectedHeap::heap()->concurrent_mark()), |
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1628 _shifter(shifter()), |
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1629 _bitmap_word_covers_words(bitmap_word_covers_words()), |
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1630 _heap_start(heap_start), |
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1631 _gclab_word_size(gclab_word_size), |
845
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1632 _real_start_word(NULL), |
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1633 _real_end_word(NULL), |
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1634 _start_word(NULL) |
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1635 { |
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1636 guarantee( size_in_words() >= bitmap_size_in_words(), |
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1637 "just making sure"); |
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1638 } |
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1639 |
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1640 inline unsigned heapWordToOffset(HeapWord* addr) { |
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1641 unsigned offset = (unsigned) pointer_delta(addr, _start_word) >> _shifter; |
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1642 assert(offset < size(), "offset should be within bounds"); |
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|
1643 return offset; |
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|
1644 } |
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1645 |
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1646 inline HeapWord* offsetToHeapWord(size_t offset) { |
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1647 HeapWord* addr = _start_word + (offset << _shifter); |
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1648 assert(_real_start_word <= addr && addr < _real_end_word, "invariant"); |
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1649 return addr; |
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1650 } |
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|
1651 |
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|
1652 bool fields_well_formed() { |
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1653 bool ret1 = (_real_start_word == NULL) && |
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1654 (_real_end_word == NULL) && |
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|
1655 (_start_word == NULL); |
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|
1656 if (ret1) |
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|
1657 return true; |
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|
1658 |
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1659 bool ret2 = _real_start_word >= _start_word && |
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1660 _start_word < _real_end_word && |
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changeset
|
1661 (_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
|
1662 (_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
|
1663 > _real_end_word; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1664 return ret2; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1665 } |
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 inline bool mark(HeapWord* addr) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1668 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1669 assert(fields_well_formed(), "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1670 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1671 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
|
1672 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
|
1673 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1674 // first mark it on the bitmap |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1675 at_put(heapWordToOffset(addr), true); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1676 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1677 return true; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1678 } else { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1679 return false; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1680 } |
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 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1683 inline bool isMarked(HeapWord* addr) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1684 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1685 assert(fields_well_formed(), "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1686 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1687 return at(heapWordToOffset(addr)); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1688 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1689 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1690 void set_buffer(HeapWord* start) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1691 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1692 clear(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1693 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1694 assert(start != NULL, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1695 _real_start_word = start; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1696 _real_end_word = start + _gclab_word_size; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1697 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1698 size_t diff = |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1699 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
|
1700 _start_word = start - diff; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1701 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1702 assert(fields_well_formed(), "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1703 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1704 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1705 #ifndef PRODUCT |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1706 void verify() { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1707 // verify that the marks have been propagated |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1708 GCLabBitMapClosure cl(_cm, this); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1709 iterate(&cl); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1710 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1711 #endif // PRODUCT |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1712 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1713 void retire() { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1714 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1715 assert(fields_well_formed(), "invariant"); |
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 if (_start_word != NULL) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1718 CMBitMap* mark_bitmap = _cm->nextMarkBitMap(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1719 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1720 // 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
|
1721 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
|
1722 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1723 mark_bitmap->mostly_disjoint_range_union(this, |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1724 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
|
1725 _start_word, |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1726 gclab_real_word_size()); |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1727 _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
|
1728 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1729 #ifndef PRODUCT |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1730 if (use_local_bitmaps && verify_local_bitmaps) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1731 verify(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1732 #endif // PRODUCT |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1733 } else { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1734 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
|
1735 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1736 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1737 |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1738 size_t bitmap_size_in_words() const { |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1739 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
|
1740 } |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1741 |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1742 }; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1743 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1744 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1745 private: |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1746 bool _retired; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1747 bool _during_marking; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1748 GCLabBitMap _bitmap; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1749 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1750 public: |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1751 G1ParGCAllocBuffer(size_t gclab_word_size) : |
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1752 ParGCAllocBuffer(gclab_word_size), |
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1753 _during_marking(G1CollectedHeap::heap()->mark_in_progress()), |
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1754 _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
|
1755 _retired(false) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1756 { } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1757 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1758 inline bool mark(HeapWord* addr) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1759 guarantee(use_local_bitmaps, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1760 assert(_during_marking, "invariant"); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1761 return _bitmap.mark(addr); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1762 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1763 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1764 inline void set_buf(HeapWord* buf) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1765 if (use_local_bitmaps && _during_marking) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1766 _bitmap.set_buffer(buf); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1767 ParGCAllocBuffer::set_buf(buf); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1768 _retired = false; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1769 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1770 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1771 inline void retire(bool end_of_gc, bool retain) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1772 if (_retired) |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1773 return; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1774 if (use_local_bitmaps && _during_marking) { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1775 _bitmap.retire(); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1776 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1777 ParGCAllocBuffer::retire(end_of_gc, retain); |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1778 _retired = true; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1779 } |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1780 }; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1781 |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1782 class G1ParScanThreadState : public StackObj { |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1783 protected: |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1784 G1CollectedHeap* _g1h; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1785 RefToScanQueue* _refs; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1786 DirtyCardQueue _dcq; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1787 CardTableModRefBS* _ct_bs; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1788 G1RemSet* _g1_rem; |
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1789 |
1391
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1790 G1ParGCAllocBuffer _surviving_alloc_buffer; |
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1791 G1ParGCAllocBuffer _tenured_alloc_buffer; |
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1792 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount]; |
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1793 ageTable _age_table; |
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1794 |
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1795 size_t _alloc_buffer_waste; |
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1796 size_t _undo_waste; |
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1797 |
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1798 OopsInHeapRegionClosure* _evac_failure_cl; |
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1799 G1ParScanHeapEvacClosure* _evac_cl; |
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1800 G1ParScanPartialArrayClosure* _partial_scan_cl; |
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1801 |
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1802 int _hash_seed; |
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1803 int _queue_num; |
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1804 |
1611 | 1805 size_t _term_attempts; |
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1806 |
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1807 double _start; |
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1808 double _start_strong_roots; |
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1809 double _strong_roots_time; |
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1810 double _start_term; |
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1811 double _term_time; |
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1812 |
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1813 // Map from young-age-index (0 == not young, 1 is youngest) to |
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1814 // surviving words. base is what we get back from the malloc call |
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1815 size_t* _surviving_young_words_base; |
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1816 // this points into the array, as we use the first few entries for padding |
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1817 size_t* _surviving_young_words; |
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1818 |
1709 | 1819 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
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1820 |
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1821 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1822 |
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1823 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1824 |
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1825 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
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1826 CardTableModRefBS* ctbs() { return _ct_bs; } |
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1827 |
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1828 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
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1829 if (!from->is_survivor()) { |
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1830 _g1_rem->par_write_ref(from, p, tid); |
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1831 } |
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1832 } |
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1833 |
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1834 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1835 // If the new value of the field points to the same region or |
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1836 // is the to-space, we don't need to include it in the Rset updates. |
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1837 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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1838 size_t card_index = ctbs()->index_for(p); |
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1839 // If the card hasn't been added to the buffer, do it. |
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1840 if (ctbs()->mark_card_deferred(card_index)) { |
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1841 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1842 } |
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1843 } |
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1844 } |
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1845 |
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1846 public: |
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1847 G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num); |
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1848 |
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1849 ~G1ParScanThreadState() { |
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1850 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base); |
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1851 } |
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1852 |
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1853 RefToScanQueue* refs() { return _refs; } |
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1854 ageTable* age_table() { return &_age_table; } |
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1855 |
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1856 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
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1857 return _alloc_buffers[purpose]; |
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1858 } |
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1859 |
1709 | 1860 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
1861 size_t undo_waste() const { return _undo_waste; } | |
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1862 |
1862
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1863 #ifdef ASSERT |
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1864 bool verify_ref(narrowOop* ref) const; |
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1865 bool verify_ref(oop* ref) const; |
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1866 bool verify_task(StarTask ref) const; |
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1867 #endif // ASSERT |
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1868 |
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1869 template <class T> void push_on_queue(T* ref) { |
1862
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1870 assert(verify_ref(ref), "sanity"); |
1709 | 1871 refs()->push(ref); |
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1872 } |
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1873 |
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1874 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
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1875 if (G1DeferredRSUpdate) { |
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1876 deferred_rs_update(from, p, tid); |
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1877 } else { |
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1878 immediate_rs_update(from, p, tid); |
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1879 } |
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1880 } |
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1881 |
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1882 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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1883 |
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1884 HeapWord* obj = NULL; |
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1885 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
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1886 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
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1887 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
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1888 assert(gclab_word_size == alloc_buf->word_sz(), |
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1889 "dynamic resizing is not supported"); |
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1890 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
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1891 alloc_buf->retire(false, false); |
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1892 |
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1893 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
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1894 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
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1895 // Otherwise. |
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1896 alloc_buf->set_buf(buf); |
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1897 |
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1898 obj = alloc_buf->allocate(word_sz); |
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1899 assert(obj != NULL, "buffer was definitely big enough..."); |
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1900 } else { |
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1901 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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1902 } |
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1903 return obj; |
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1904 } |
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1905 |
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1906 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
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1907 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1908 if (obj != NULL) return obj; |
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1909 return allocate_slow(purpose, word_sz); |
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1910 } |
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1911 |
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1912 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
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1913 if (alloc_buffer(purpose)->contains(obj)) { |
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1914 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
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1915 "should contain whole object"); |
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1916 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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1917 } else { |
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1918 CollectedHeap::fill_with_object(obj, word_sz); |
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1919 add_to_undo_waste(word_sz); |
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1920 } |
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1921 } |
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1922 |
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1923 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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1924 _evac_failure_cl = evac_failure_cl; |
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1925 } |
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1926 OopsInHeapRegionClosure* evac_failure_closure() { |
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1927 return _evac_failure_cl; |
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1928 } |
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1929 |
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1930 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
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1931 _evac_cl = evac_cl; |
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1932 } |
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1933 |
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1934 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
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1935 _partial_scan_cl = partial_scan_cl; |
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1936 } |
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1937 |
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1938 int* hash_seed() { return &_hash_seed; } |
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1939 int queue_num() { return _queue_num; } |
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1940 |
1709 | 1941 size_t term_attempts() const { return _term_attempts; } |
1611 | 1942 void note_term_attempt() { _term_attempts++; } |
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1943 |
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1944 void start_strong_roots() { |
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1945 _start_strong_roots = os::elapsedTime(); |
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1946 } |
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1947 void end_strong_roots() { |
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1948 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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1949 } |
1709 | 1950 double strong_roots_time() const { return _strong_roots_time; } |
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1951 |
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1952 void start_term_time() { |
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1953 note_term_attempt(); |
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1954 _start_term = os::elapsedTime(); |
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1955 } |
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1956 void end_term_time() { |
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1957 _term_time += (os::elapsedTime() - _start_term); |
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1958 } |
1709 | 1959 double term_time() const { return _term_time; } |
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1960 |
1709 | 1961 double elapsed_time() const { |
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1962 return os::elapsedTime() - _start; |
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1963 } |
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1964 |
1709 | 1965 static void |
1966 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
1967 void | |
1968 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
1969 | |
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1970 size_t* surviving_young_words() { |
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1971 // We add on to hide entry 0 which accumulates surviving words for |
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1972 // age -1 regions (i.e. non-young ones) |
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1973 return _surviving_young_words; |
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1974 } |
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1975 |
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1976 void retire_alloc_buffers() { |
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1977 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
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1978 size_t waste = _alloc_buffers[ap]->words_remaining(); |
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1979 add_to_alloc_buffer_waste(waste); |
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1980 _alloc_buffers[ap]->retire(true, false); |
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1981 } |
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1982 } |
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1983 |
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1984 template <class T> void deal_with_reference(T* ref_to_scan) { |
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1985 if (has_partial_array_mask(ref_to_scan)) { |
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1986 _partial_scan_cl->do_oop_nv(ref_to_scan); |
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1987 } else { |
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1988 // Note: we can use "raw" versions of "region_containing" because |
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1989 // "obj_to_scan" is definitely in the heap, and is not in a |
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1990 // humongous region. |
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1991 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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1992 _evac_cl->set_region(r); |
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1993 _evac_cl->do_oop_nv(ref_to_scan); |
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1994 } |
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1995 } |
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1996 |
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1997 void deal_with_reference(StarTask ref) { |
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1998 assert(verify_task(ref), "sanity"); |
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1999 if (ref.is_narrow()) { |
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2000 deal_with_reference((narrowOop*)ref); |
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2001 } else { |
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2002 deal_with_reference((oop*)ref); |
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2003 } |
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2004 } |
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2005 |
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2006 public: |
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2007 void trim_queue(); |
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2008 }; |
1972 | 2009 |
2010 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |