Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 3764:053d84a76d3d
7032531: G1: enhance GC logging to include more accurate eden / survivor size transitions
Summary: This changeset extends the logging information generated by +PrintGCDetails to also print out separate size transitions for the eden, survivors, and old regions.
Reviewed-by: ysr, brutisso
| author | tonyp |
|---|---|
| date | Wed, 08 Jun 2011 15:31:51 -0400 |
| parents | 2aa9ddbb9e60 |
| children | c3f1170908be |
| rev | line source |
|---|---|
| 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" |
| 1972 | 30 #include "gc_implementation/g1/g1RemSet.hpp" |
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31 #include "gc_implementation/g1/g1MonitoringSupport.hpp" |
| 2152 | 32 #include "gc_implementation/g1/heapRegionSets.hpp" |
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33 #include "gc_implementation/shared/hSpaceCounters.hpp" |
| 1972 | 34 #include "gc_implementation/parNew/parGCAllocBuffer.hpp" |
| 35 #include "memory/barrierSet.hpp" | |
| 36 #include "memory/memRegion.hpp" | |
| 37 #include "memory/sharedHeap.hpp" | |
| 38 | |
| 342 | 39 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
| 40 // It uses the "Garbage First" heap organization and algorithm, which | |
| 41 // may combine concurrent marking with parallel, incremental compaction of | |
| 42 // heap subsets that will yield large amounts of garbage. | |
| 43 | |
| 44 class HeapRegion; | |
| 45 class HeapRegionSeq; | |
| 2173 | 46 class HRRSCleanupTask; |
| 342 | 47 class PermanentGenerationSpec; |
| 48 class GenerationSpec; | |
| 49 class OopsInHeapRegionClosure; | |
| 50 class G1ScanHeapEvacClosure; | |
| 51 class ObjectClosure; | |
| 52 class SpaceClosure; | |
| 53 class CompactibleSpaceClosure; | |
| 54 class Space; | |
| 55 class G1CollectorPolicy; | |
| 56 class GenRemSet; | |
| 57 class G1RemSet; | |
| 58 class HeapRegionRemSetIterator; | |
| 59 class ConcurrentMark; | |
| 60 class ConcurrentMarkThread; | |
| 61 class ConcurrentG1Refine; | |
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62 class GenerationCounters; |
| 342 | 63 |
| 1709 | 64 typedef OverflowTaskQueue<StarTask> RefToScanQueue; |
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65 typedef GenericTaskQueueSet<RefToScanQueue> RefToScanQueueSet; |
| 342 | 66 |
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67 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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68 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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69 |
| 342 | 70 enum GCAllocPurpose { |
| 71 GCAllocForTenured, | |
| 72 GCAllocForSurvived, | |
| 73 GCAllocPurposeCount | |
| 74 }; | |
| 75 | |
| 76 class YoungList : public CHeapObj { | |
| 77 private: | |
| 78 G1CollectedHeap* _g1h; | |
| 79 | |
| 80 HeapRegion* _head; | |
| 81 | |
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82 HeapRegion* _survivor_head; |
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83 HeapRegion* _survivor_tail; |
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84 |
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85 HeapRegion* _curr; |
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86 |
| 342 | 87 size_t _length; |
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88 size_t _survivor_length; |
| 342 | 89 |
| 90 size_t _last_sampled_rs_lengths; | |
| 91 size_t _sampled_rs_lengths; | |
| 92 | |
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93 void empty_list(HeapRegion* list); |
| 342 | 94 |
| 95 public: | |
| 96 YoungList(G1CollectedHeap* g1h); | |
| 97 | |
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98 void push_region(HeapRegion* hr); |
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99 void add_survivor_region(HeapRegion* hr); |
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100 |
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101 void empty_list(); |
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102 bool is_empty() { return _length == 0; } |
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103 size_t length() { return _length; } |
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104 size_t survivor_length() { return _survivor_length; } |
| 342 | 105 |
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106 // Currently we do not keep track of the used byte sum for the |
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107 // young list and the survivors and it'd be quite a lot of work to |
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108 // do so. When we'll eventually replace the young list with |
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109 // instances of HeapRegionLinkedList we'll get that for free. So, |
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110 // we'll report the more accurate information then. |
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111 size_t eden_used_bytes() { |
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112 assert(length() >= survivor_length(), "invariant"); |
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113 return (length() - survivor_length()) * HeapRegion::GrainBytes; |
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114 } |
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115 size_t survivor_used_bytes() { |
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116 return survivor_length() * HeapRegion::GrainBytes; |
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117 } |
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118 |
| 342 | 119 void rs_length_sampling_init(); |
| 120 bool rs_length_sampling_more(); | |
| 121 void rs_length_sampling_next(); | |
| 122 | |
| 123 void reset_sampled_info() { | |
| 124 _last_sampled_rs_lengths = 0; | |
| 125 } | |
| 126 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
| 127 | |
| 128 // for development purposes | |
| 129 void reset_auxilary_lists(); | |
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130 void clear() { _head = NULL; _length = 0; } |
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131 |
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132 void clear_survivors() { |
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133 _survivor_head = NULL; |
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134 _survivor_tail = NULL; |
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135 _survivor_length = 0; |
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136 } |
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137 |
| 342 | 138 HeapRegion* first_region() { return _head; } |
| 139 HeapRegion* first_survivor_region() { return _survivor_head; } | |
| 545 | 140 HeapRegion* last_survivor_region() { return _survivor_tail; } |
| 342 | 141 |
| 142 // debugging | |
| 143 bool check_list_well_formed(); | |
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144 bool check_list_empty(bool check_sample = true); |
| 342 | 145 void print(); |
| 146 }; | |
| 147 | |
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148 class MutatorAllocRegion : public G1AllocRegion { |
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149 protected: |
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150 virtual HeapRegion* allocate_new_region(size_t word_size, bool force); |
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151 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes); |
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152 public: |
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153 MutatorAllocRegion() |
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154 : G1AllocRegion("Mutator Alloc Region", false /* bot_updates */) { } |
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155 }; |
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156 |
| 342 | 157 class RefineCardTableEntryClosure; |
| 158 class G1CollectedHeap : public SharedHeap { | |
| 159 friend class VM_G1CollectForAllocation; | |
| 160 friend class VM_GenCollectForPermanentAllocation; | |
| 161 friend class VM_G1CollectFull; | |
| 162 friend class VM_G1IncCollectionPause; | |
| 163 friend class VMStructs; | |
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164 friend class MutatorAllocRegion; |
| 342 | 165 |
| 166 // Closures used in implementation. | |
| 167 friend class G1ParCopyHelper; | |
| 168 friend class G1IsAliveClosure; | |
| 169 friend class G1EvacuateFollowersClosure; | |
| 170 friend class G1ParScanThreadState; | |
| 171 friend class G1ParScanClosureSuper; | |
| 172 friend class G1ParEvacuateFollowersClosure; | |
| 173 friend class G1ParTask; | |
| 174 friend class G1FreeGarbageRegionClosure; | |
| 175 friend class RefineCardTableEntryClosure; | |
| 176 friend class G1PrepareCompactClosure; | |
| 177 friend class RegionSorter; | |
| 2152 | 178 friend class RegionResetter; |
| 342 | 179 friend class CountRCClosure; |
| 180 friend class EvacPopObjClosure; | |
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181 friend class G1ParCleanupCTTask; |
| 342 | 182 |
| 183 // Other related classes. | |
| 184 friend class G1MarkSweep; | |
| 185 | |
| 186 private: | |
| 187 // The one and only G1CollectedHeap, so static functions can find it. | |
| 188 static G1CollectedHeap* _g1h; | |
| 189 | |
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190 static size_t _humongous_object_threshold_in_words; |
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191 |
| 342 | 192 // Storage for the G1 heap (excludes the permanent generation). |
| 193 VirtualSpace _g1_storage; | |
| 194 MemRegion _g1_reserved; | |
| 195 | |
| 196 // The part of _g1_storage that is currently committed. | |
| 197 MemRegion _g1_committed; | |
| 198 | |
| 199 // The maximum part of _g1_storage that has ever been committed. | |
| 200 MemRegion _g1_max_committed; | |
| 201 | |
| 2152 | 202 // The master free list. It will satisfy all new region allocations. |
| 203 MasterFreeRegionList _free_list; | |
| 204 | |
| 205 // The secondary free list which contains regions that have been | |
| 206 // freed up during the cleanup process. This will be appended to the | |
| 207 // master free list when appropriate. | |
| 208 SecondaryFreeRegionList _secondary_free_list; | |
| 209 | |
| 210 // It keeps track of the humongous regions. | |
| 211 MasterHumongousRegionSet _humongous_set; | |
| 342 | 212 |
| 213 // The number of regions we could create by expansion. | |
| 214 size_t _expansion_regions; | |
| 215 | |
| 216 // The block offset table for the G1 heap. | |
| 217 G1BlockOffsetSharedArray* _bot_shared; | |
| 218 | |
| 219 // Move all of the regions off the free lists, then rebuild those free | |
| 220 // lists, before and after full GC. | |
| 221 void tear_down_region_lists(); | |
| 222 void rebuild_region_lists(); | |
| 223 | |
| 224 // The sequence of all heap regions in the heap. | |
| 225 HeapRegionSeq* _hrs; | |
| 226 | |
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227 // Alloc region used to satisfy mutator allocation requests. |
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228 MutatorAllocRegion _mutator_alloc_region; |
| 342 | 229 |
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230 // It resets the mutator alloc region before new allocations can take place. |
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231 void init_mutator_alloc_region(); |
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232 |
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233 // It releases the mutator alloc region. |
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234 void release_mutator_alloc_region(); |
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235 |
| 636 | 236 void abandon_gc_alloc_regions(); |
| 342 | 237 |
| 238 // The to-space memory regions into which objects are being copied during | |
| 239 // a GC. | |
| 240 HeapRegion* _gc_alloc_regions[GCAllocPurposeCount]; | |
| 545 | 241 size_t _gc_alloc_region_counts[GCAllocPurposeCount]; |
| 636 | 242 // These are the regions, one per GCAllocPurpose, that are half-full |
| 243 // at the end of a collection and that we want to reuse during the | |
| 244 // next collection. | |
| 245 HeapRegion* _retained_gc_alloc_regions[GCAllocPurposeCount]; | |
| 246 // This specifies whether we will keep the last half-full region at | |
| 247 // the end of a collection so that it can be reused during the next | |
| 248 // collection (this is specified per GCAllocPurpose) | |
| 249 bool _retain_gc_alloc_region[GCAllocPurposeCount]; | |
| 342 | 250 |
| 251 // A list of the regions that have been set to be alloc regions in the | |
| 252 // current collection. | |
| 253 HeapRegion* _gc_alloc_region_list; | |
| 254 | |
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255 // Helper for monitoring and management support. |
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256 G1MonitoringSupport* _g1mm; |
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257 |
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258 // Determines PLAB size for a particular allocation purpose. |
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259 static size_t desired_plab_sz(GCAllocPurpose purpose); |
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260 |
| 2152 | 261 // When called by par thread, requires the FreeList_lock to be held. |
| 342 | 262 void push_gc_alloc_region(HeapRegion* hr); |
| 263 | |
| 264 // This should only be called single-threaded. Undeclares all GC alloc | |
| 265 // regions. | |
| 266 void forget_alloc_region_list(); | |
| 267 | |
| 268 // Should be used to set an alloc region, because there's other | |
| 269 // associated bookkeeping. | |
| 270 void set_gc_alloc_region(int purpose, HeapRegion* r); | |
| 271 | |
| 272 // Check well-formedness of alloc region list. | |
| 273 bool check_gc_alloc_regions(); | |
| 274 | |
| 275 // Outside of GC pauses, the number of bytes used in all regions other | |
| 276 // than the current allocation region. | |
| 277 size_t _summary_bytes_used; | |
| 278 | |
| 526 | 279 // This is used for a quick test on whether a reference points into |
| 280 // the collection set or not. Basically, we have an array, with one | |
| 281 // byte per region, and that byte denotes whether the corresponding | |
| 282 // region is in the collection set or not. The entry corresponding | |
| 283 // the bottom of the heap, i.e., region 0, is pointed to by | |
| 284 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
| 285 // biased so that it actually points to address 0 of the address | |
| 286 // space, to make the test as fast as possible (we can simply shift | |
| 287 // the address to address into it, instead of having to subtract the | |
| 288 // bottom of the heap from the address before shifting it; basically | |
| 289 // it works in the same way the card table works). | |
| 290 bool* _in_cset_fast_test; | |
| 291 | |
| 292 // The allocated array used for the fast test on whether a reference | |
| 293 // points into the collection set or not. This field is also used to | |
| 294 // free the array. | |
| 295 bool* _in_cset_fast_test_base; | |
| 296 | |
| 297 // The length of the _in_cset_fast_test_base array. | |
| 298 size_t _in_cset_fast_test_length; | |
| 299 | |
|
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300 volatile unsigned _gc_time_stamp; |
| 342 | 301 |
| 302 size_t* _surviving_young_words; | |
| 303 | |
| 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 |
| 396 // The number of regions allocated to hold humongous objects. | |
| 397 int _num_humongous_regions; | |
| 398 YoungList* _young_list; | |
| 399 | |
| 400 // The current policy object for the collector. | |
| 401 G1CollectorPolicy* _g1_policy; | |
| 402 | |
| 2152 | 403 // This is the second level of trying to allocate a new region. If |
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404 // new_region() didn't find a region on the free_list, this call will |
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405 // check whether there's anything available on the |
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406 // secondary_free_list and/or wait for more regions to appear on |
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407 // that list, if _free_regions_coming is set. |
| 2361 | 408 HeapRegion* new_region_try_secondary_free_list(); |
| 342 | 409 |
| 2361 | 410 // Try to allocate a single non-humongous HeapRegion sufficient for |
| 411 // an allocation of the given word_size. If do_expand is true, | |
| 412 // attempt to expand the heap if necessary to satisfy the allocation | |
| 413 // request. | |
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414 HeapRegion* new_region(size_t word_size, bool do_expand); |
| 342 | 415 |
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416 // Try to allocate a new region to be used for allocation by |
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417 // a GC thread. It will try to expand the heap if no region is |
| 2361 | 418 // available. |
| 2152 | 419 HeapRegion* new_gc_alloc_region(int purpose, size_t word_size); |
| 420 | |
| 2361 | 421 // Attempt to satisfy a humongous allocation request of the given |
| 422 // size by finding a contiguous set of free regions of num_regions | |
| 423 // length and remove them from the master free list. Return the | |
| 424 // index of the first region or -1 if the search was unsuccessful. | |
| 2152 | 425 int humongous_obj_allocate_find_first(size_t num_regions, size_t word_size); |
| 342 | 426 |
| 2361 | 427 // Initialize a contiguous set of free regions of length num_regions |
| 428 // and starting at index first so that they appear as a single | |
| 429 // humongous region. | |
| 430 HeapWord* humongous_obj_allocate_initialize_regions(int first, | |
| 431 size_t num_regions, | |
| 432 size_t word_size); | |
| 433 | |
| 434 // Attempt to allocate a humongous object of the given size. Return | |
| 435 // NULL if unsuccessful. | |
| 2152 | 436 HeapWord* humongous_obj_allocate(size_t word_size); |
| 1973 | 437 |
| 438 // The following two methods, allocate_new_tlab() and | |
| 439 // mem_allocate(), are the two main entry points from the runtime | |
| 440 // into the G1's allocation routines. They have the following | |
| 441 // assumptions: | |
| 442 // | |
| 443 // * They should both be called outside safepoints. | |
| 444 // | |
| 445 // * They should both be called without holding the Heap_lock. | |
| 446 // | |
| 447 // * All allocation requests for new TLABs should go to | |
| 448 // allocate_new_tlab(). | |
| 449 // | |
| 450 // * All non-TLAB allocation requests should go to mem_allocate() | |
| 451 // and mem_allocate() should never be called with is_tlab == true. | |
| 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 is_noref, | |
| 472 bool is_tlab, /* expected to be false */ | |
| 473 bool* gc_overhead_limit_was_exceeded); | |
| 342 | 474 |
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475 // The following three methods take a gc_count_before_ret |
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476 // parameter which is used to return the GC count if the method |
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477 // returns NULL. Given that we are required to read the GC count |
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478 // while holding the Heap_lock, and these paths will take the |
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479 // Heap_lock at some point, it's easier to get them to read the GC |
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480 // count while holding the Heap_lock before they return NULL instead |
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481 // of the caller (namely: mem_allocate()) having to also take the |
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482 // Heap_lock just to read the GC count. |
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483 |
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484 // First-level mutator allocation attempt: try to allocate out of |
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485 // the mutator alloc region without taking the Heap_lock. This |
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486 // should only be used for non-humongous allocations. |
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487 inline HeapWord* attempt_allocation(size_t word_size, |
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488 unsigned int* gc_count_before_ret); |
| 342 | 489 |
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490 // Second-level mutator allocation attempt: take the Heap_lock and |
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491 // retry the allocation attempt, potentially scheduling a GC |
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492 // pause. This should only be used for non-humongous allocations. |
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493 HeapWord* attempt_allocation_slow(size_t word_size, |
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494 unsigned int* gc_count_before_ret); |
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495 |
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496 // Takes the Heap_lock and attempts a humongous allocation. It can |
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497 // potentially schedule a GC pause. |
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498 HeapWord* attempt_allocation_humongous(size_t word_size, |
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499 unsigned int* gc_count_before_ret); |
| 1973 | 500 |
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501 // Allocation attempt that should be called during safepoints (e.g., |
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502 // at the end of a successful GC). expect_null_mutator_alloc_region |
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503 // specifies whether the mutator alloc region is expected to be NULL |
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504 // or not. |
| 1973 | 505 HeapWord* attempt_allocation_at_safepoint(size_t word_size, |
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506 bool expect_null_mutator_alloc_region); |
| 1973 | 507 |
| 508 // It dirties the cards that cover the block so that so that the post | |
| 509 // write barrier never queues anything when updating objects on this | |
| 510 // block. It is assumed (and in fact we assert) that the block | |
| 511 // belongs to a young region. | |
| 512 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
| 342 | 513 |
| 514 // Allocate blocks during garbage collection. Will ensure an | |
| 515 // allocation region, either by picking one or expanding the | |
| 516 // heap, and then allocate a block of the given size. The block | |
| 517 // may not be a humongous - it must fit into a single heap region. | |
| 518 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
| 519 | |
| 520 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, | |
| 521 HeapRegion* alloc_region, | |
| 522 bool par, | |
| 523 size_t word_size); | |
| 524 | |
| 525 // Ensure that no further allocations can happen in "r", bearing in mind | |
| 526 // that parallel threads might be attempting allocations. | |
| 527 void par_allocate_remaining_space(HeapRegion* r); | |
| 528 | |
| 545 | 529 // Retires an allocation region when it is full or at the end of a |
| 530 // GC pause. | |
| 531 void retire_alloc_region(HeapRegion* alloc_region, bool par); | |
| 532 | |
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533 // These two methods are the "callbacks" from the G1AllocRegion class. |
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534 |
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535 HeapRegion* new_mutator_alloc_region(size_t word_size, bool force); |
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536 void retire_mutator_alloc_region(HeapRegion* alloc_region, |
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537 size_t allocated_bytes); |
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538 |
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539 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
| 1973 | 540 // inspection request and should collect the entire heap |
| 541 // - if clear_all_soft_refs is true, all soft references should be | |
| 542 // cleared during the GC | |
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543 // - if explicit_gc is false, word_size describes the allocation that |
| 1973 | 544 // the GC should attempt (at least) to satisfy |
| 545 // - it returns false if it is unable to do the collection due to the | |
| 546 // GC locker being active, true otherwise | |
| 547 bool do_collection(bool explicit_gc, | |
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548 bool clear_all_soft_refs, |
| 342 | 549 size_t word_size); |
| 550 | |
| 551 // Callback from VM_G1CollectFull operation. | |
| 552 // Perform a full collection. | |
| 553 void do_full_collection(bool clear_all_soft_refs); | |
| 554 | |
| 555 // Resize the heap if necessary after a full collection. If this is | |
| 556 // after a collect-for allocation, "word_size" is the allocation size, | |
| 557 // and will be considered part of the used portion of the heap. | |
| 558 void resize_if_necessary_after_full_collection(size_t word_size); | |
| 559 | |
| 560 // Callback from VM_G1CollectForAllocation operation. | |
| 561 // This function does everything necessary/possible to satisfy a | |
| 562 // failed allocation request (including collection, expansion, etc.) | |
| 1973 | 563 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
| 342 | 564 |
| 565 // Attempting to expand the heap sufficiently | |
| 566 // to support an allocation of the given "word_size". If | |
| 567 // successful, perform the allocation and return the address of the | |
| 568 // allocated block, or else "NULL". | |
| 1973 | 569 HeapWord* expand_and_allocate(size_t word_size); |
| 342 | 570 |
| 571 public: | |
|
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572 |
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573 G1MonitoringSupport* g1mm() { return _g1mm; } |
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574 |
| 342 | 575 // Expand the garbage-first heap by at least the given size (in bytes!). |
|
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576 // Returns true if the heap was expanded by the requested amount; |
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577 // false otherwise. |
| 342 | 578 // (Rounds up to a HeapRegion boundary.) |
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579 bool expand(size_t expand_bytes); |
| 342 | 580 |
| 581 // Do anything common to GC's. | |
| 582 virtual void gc_prologue(bool full); | |
| 583 virtual void gc_epilogue(bool full); | |
| 584 | |
| 526 | 585 // We register a region with the fast "in collection set" test. We |
| 586 // simply set to true the array slot corresponding to this region. | |
| 587 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
| 588 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
| 589 assert(r->in_collection_set(), "invariant"); | |
| 590 int index = r->hrs_index(); | |
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591 assert(0 <= index && (size_t) index < _in_cset_fast_test_length, "invariant"); |
| 526 | 592 assert(!_in_cset_fast_test_base[index], "invariant"); |
| 593 _in_cset_fast_test_base[index] = true; | |
| 594 } | |
| 595 | |
| 596 // This is a fast test on whether a reference points into the | |
| 597 // collection set or not. It does not assume that the reference | |
| 598 // points into the heap; if it doesn't, it will return false. | |
| 599 bool in_cset_fast_test(oop obj) { | |
| 600 assert(_in_cset_fast_test != NULL, "sanity"); | |
| 601 if (_g1_committed.contains((HeapWord*) obj)) { | |
| 602 // no need to subtract the bottom of the heap from obj, | |
| 603 // _in_cset_fast_test is biased | |
| 604 size_t index = ((size_t) obj) >> HeapRegion::LogOfHRGrainBytes; | |
| 605 bool ret = _in_cset_fast_test[index]; | |
| 606 // let's make sure the result is consistent with what the slower | |
| 607 // test returns | |
| 608 assert( ret || !obj_in_cs(obj), "sanity"); | |
| 609 assert(!ret || obj_in_cs(obj), "sanity"); | |
| 610 return ret; | |
| 611 } else { | |
| 612 return false; | |
| 613 } | |
| 614 } | |
| 615 | |
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616 void clear_cset_fast_test() { |
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617 assert(_in_cset_fast_test_base != NULL, "sanity"); |
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618 memset(_in_cset_fast_test_base, false, |
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619 _in_cset_fast_test_length * sizeof(bool)); |
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620 } |
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621 |
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622 // This is called at the end of either a concurrent cycle or a Full |
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623 // GC to update the number of full collections completed. Those two |
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624 // can happen in a nested fashion, i.e., we start a concurrent |
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625 // cycle, a Full GC happens half-way through it which ends first, |
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626 // and then the cycle notices that a Full GC happened and ends |
|
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627 // too. The concurrent parameter is a boolean to help us do a bit |
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628 // tighter consistency checking in the method. If concurrent is |
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629 // false, the caller is the inner caller in the nesting (i.e., the |
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630 // Full GC). If concurrent is true, the caller is the outer caller |
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631 // in this nesting (i.e., the concurrent cycle). Further nesting is |
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632 // not currently supported. The end of the this call also notifies |
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633 // the FullGCCount_lock in case a Java thread is waiting for a full |
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634 // GC to happen (e.g., it called System.gc() with |
|
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635 // +ExplicitGCInvokesConcurrent). |
|
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636 void increment_full_collections_completed(bool concurrent); |
|
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637 |
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638 unsigned int full_collections_completed() { |
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639 return _full_collections_completed; |
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640 } |
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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 | |
|
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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 |
| 757 // The concurrent marker (and the thread it runs in.) | |
| 758 ConcurrentMark* _cm; | |
| 759 ConcurrentMarkThread* _cmThread; | |
| 760 bool _mark_in_progress; | |
| 761 | |
| 762 // The concurrent refiner. | |
| 763 ConcurrentG1Refine* _cg1r; | |
| 764 | |
| 765 // The parallel task queues | |
| 766 RefToScanQueueSet *_task_queues; | |
| 767 | |
| 768 // True iff a evacuation has failed in the current collection. | |
| 769 bool _evacuation_failed; | |
| 770 | |
| 771 // Set the attribute indicating whether evacuation has failed in the | |
| 772 // current collection. | |
| 773 void set_evacuation_failed(bool b) { _evacuation_failed = b; } | |
| 774 | |
| 775 // Failed evacuations cause some logical from-space objects to have | |
| 776 // forwarding pointers to themselves. Reset them. | |
| 777 void remove_self_forwarding_pointers(); | |
| 778 | |
| 779 // When one is non-null, so is the other. Together, they each pair is | |
| 780 // an object with a preserved mark, and its mark value. | |
| 781 GrowableArray<oop>* _objs_with_preserved_marks; | |
| 782 GrowableArray<markOop>* _preserved_marks_of_objs; | |
| 783 | |
| 784 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
| 785 // word being overwritten with a self-forwarding-pointer. | |
| 786 void preserve_mark_if_necessary(oop obj, markOop m); | |
| 787 | |
| 788 // The stack of evac-failure objects left to be scanned. | |
| 789 GrowableArray<oop>* _evac_failure_scan_stack; | |
| 790 // The closure to apply to evac-failure objects. | |
| 791 | |
| 792 OopsInHeapRegionClosure* _evac_failure_closure; | |
| 793 // Set the field above. | |
| 794 void | |
| 795 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
| 796 _evac_failure_closure = evac_failure_closure; | |
| 797 } | |
| 798 | |
| 799 // Push "obj" on the scan stack. | |
| 800 void push_on_evac_failure_scan_stack(oop obj); | |
| 801 // Process scan stack entries until the stack is empty. | |
| 802 void drain_evac_failure_scan_stack(); | |
| 803 // True iff an invocation of "drain_scan_stack" is in progress; to | |
| 804 // prevent unnecessary recursion. | |
| 805 bool _drain_in_progress; | |
| 806 | |
| 807 // Do any necessary initialization for evacuation-failure handling. | |
| 808 // "cl" is the closure that will be used to process evac-failure | |
| 809 // objects. | |
| 810 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
| 811 // Do any necessary cleanup for evacuation-failure handling data | |
| 812 // structures. | |
| 813 void finalize_for_evac_failure(); | |
| 814 | |
| 815 // An attempt to evacuate "obj" has failed; take necessary steps. | |
| 816 oop handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, oop obj); | |
| 817 void handle_evacuation_failure_common(oop obj, markOop m); | |
| 818 | |
| 819 | |
| 820 // Ensure that the relevant gc_alloc regions are set. | |
| 821 void get_gc_alloc_regions(); | |
| 636 | 822 // We're done with GC alloc regions. We are going to tear down the |
| 823 // gc alloc list and remove the gc alloc tag from all the regions on | |
| 824 // that list. However, we will also retain the last (i.e., the one | |
| 825 // that is half-full) GC alloc region, per GCAllocPurpose, for | |
| 826 // possible reuse during the next collection, provided | |
| 827 // _retain_gc_alloc_region[] indicates that it should be the | |
| 828 // case. Said regions are kept in the _retained_gc_alloc_regions[] | |
| 829 // array. If the parameter totally is set, we will not retain any | |
| 830 // regions, irrespective of what _retain_gc_alloc_region[] | |
| 831 // indicates. | |
| 832 void release_gc_alloc_regions(bool totally); | |
| 833 #ifndef PRODUCT | |
| 834 // Useful for debugging. | |
| 835 void print_gc_alloc_regions(); | |
| 836 #endif // !PRODUCT | |
| 342 | 837 |
|
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838 // Instance of the concurrent mark is_alive closure for embedding |
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839 // into the reference processor as the is_alive_non_header. This |
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840 // prevents unnecessary additions to the discovered lists during |
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841 // concurrent discovery. |
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842 G1CMIsAliveClosure _is_alive_closure; |
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843 |
| 342 | 844 // ("Weak") Reference processing support |
| 845 ReferenceProcessor* _ref_processor; | |
| 846 | |
| 847 enum G1H_process_strong_roots_tasks { | |
| 848 G1H_PS_mark_stack_oops_do, | |
| 849 G1H_PS_refProcessor_oops_do, | |
| 850 // Leave this one last. | |
| 851 G1H_PS_NumElements | |
| 852 }; | |
| 853 | |
| 854 SubTasksDone* _process_strong_tasks; | |
| 855 | |
| 2152 | 856 volatile bool _free_regions_coming; |
| 342 | 857 |
| 858 public: | |
|
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859 |
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860 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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861 |
| 342 | 862 void set_refine_cte_cl_concurrency(bool concurrent); |
| 863 | |
| 1709 | 864 RefToScanQueue *task_queue(int i) const; |
| 342 | 865 |
|
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866 // A set of cards where updates happened during the GC |
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867 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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868 |
| 1705 | 869 // A DirtyCardQueueSet that is used to hold cards that contain |
| 870 // references into the current collection set. This is used to | |
| 871 // update the remembered sets of the regions in the collection | |
| 872 // set in the event of an evacuation failure. | |
| 873 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
| 874 { return _into_cset_dirty_card_queue_set; } | |
| 875 | |
| 342 | 876 // Create a G1CollectedHeap with the specified policy. |
| 877 // Must call the initialize method afterwards. | |
| 878 // May not return if something goes wrong. | |
| 879 G1CollectedHeap(G1CollectorPolicy* policy); | |
| 880 | |
| 881 // Initialize the G1CollectedHeap to have the initial and | |
| 882 // maximum sizes, permanent generation, and remembered and barrier sets | |
| 883 // specified by the policy object. | |
| 884 jint initialize(); | |
| 885 | |
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886 virtual void ref_processing_init(); |
| 342 | 887 |
| 888 void set_par_threads(int t) { | |
| 889 SharedHeap::set_par_threads(t); | |
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890 _process_strong_tasks->set_n_threads(t); |
| 342 | 891 } |
| 892 | |
| 893 virtual CollectedHeap::Name kind() const { | |
| 894 return CollectedHeap::G1CollectedHeap; | |
| 895 } | |
| 896 | |
| 897 // The current policy object for the collector. | |
| 898 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
| 899 | |
| 900 // Adaptive size policy. No such thing for g1. | |
| 901 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
| 902 | |
| 903 // The rem set and barrier set. | |
| 904 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
| 905 ModRefBarrierSet* mr_bs() const { return _mr_bs; } | |
| 906 | |
| 907 // The rem set iterator. | |
| 908 HeapRegionRemSetIterator* rem_set_iterator(int i) { | |
| 909 return _rem_set_iterator[i]; | |
| 910 } | |
| 911 | |
| 912 HeapRegionRemSetIterator* rem_set_iterator() { | |
| 913 return _rem_set_iterator[0]; | |
| 914 } | |
| 915 | |
| 916 unsigned get_gc_time_stamp() { | |
| 917 return _gc_time_stamp; | |
| 918 } | |
| 919 | |
| 920 void reset_gc_time_stamp() { | |
| 921 _gc_time_stamp = 0; | |
|
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922 OrderAccess::fence(); |
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923 } |
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924 |
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925 void increment_gc_time_stamp() { |
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926 ++_gc_time_stamp; |
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927 OrderAccess::fence(); |
| 342 | 928 } |
| 929 | |
| 1705 | 930 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 931 DirtyCardQueue* into_cset_dcq, | |
| 932 bool concurrent, int worker_i); | |
| 342 | 933 |
| 934 // The shared block offset table array. | |
| 935 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
| 936 | |
| 937 // Reference Processing accessor | |
| 938 ReferenceProcessor* ref_processor() { return _ref_processor; } | |
| 939 | |
| 940 virtual size_t capacity() const; | |
| 941 virtual size_t used() const; | |
|
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942 // This should be called when we're not holding the heap lock. The |
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943 // result might be a bit inaccurate. |
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944 size_t used_unlocked() const; |
| 342 | 945 size_t recalculate_used() const; |
| 946 #ifndef PRODUCT | |
| 947 size_t recalculate_used_regions() const; | |
| 948 #endif // PRODUCT | |
| 949 | |
| 950 // These virtual functions do the actual allocation. | |
| 951 // Some heaps may offer a contiguous region for shared non-blocking | |
| 952 // allocation, via inlined code (by exporting the address of the top and | |
| 953 // end fields defining the extent of the contiguous allocation region.) | |
| 954 // But G1CollectedHeap doesn't yet support this. | |
| 955 | |
| 956 // Return an estimate of the maximum allocation that could be performed | |
| 957 // without triggering any collection or expansion activity. In a | |
| 958 // generational collector, for example, this is probably the largest | |
| 959 // allocation that could be supported (without expansion) in the youngest | |
| 960 // generation. It is "unsafe" because no locks are taken; the result | |
| 961 // should be treated as an approximation, not a guarantee, for use in | |
| 962 // heuristic resizing decisions. | |
| 963 virtual size_t unsafe_max_alloc(); | |
| 964 | |
| 965 virtual bool is_maximal_no_gc() const { | |
| 966 return _g1_storage.uncommitted_size() == 0; | |
| 967 } | |
| 968 | |
| 969 // The total number of regions in the heap. | |
| 970 size_t n_regions(); | |
| 971 | |
| 972 // The number of regions that are completely free. | |
| 973 size_t max_regions(); | |
| 974 | |
| 975 // The number of regions that are completely free. | |
| 2152 | 976 size_t free_regions() { |
| 977 return _free_list.length(); | |
| 978 } | |
| 342 | 979 |
| 980 // The number of regions that are not completely free. | |
| 981 size_t used_regions() { return n_regions() - free_regions(); } | |
| 982 | |
| 983 // The number of regions available for "regular" expansion. | |
| 984 size_t expansion_regions() { return _expansion_regions; } | |
| 985 | |
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986 void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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987 void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN; |
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988 void verify_dirty_young_list(HeapRegion* head) PRODUCT_RETURN; |
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989 void verify_dirty_young_regions() PRODUCT_RETURN; |
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990 |
| 2152 | 991 // verify_region_sets() performs verification over the region |
| 992 // lists. It will be compiled in the product code to be used when | |
| 993 // necessary (i.e., during heap verification). | |
| 994 void verify_region_sets(); | |
| 342 | 995 |
| 2152 | 996 // verify_region_sets_optional() is planted in the code for |
| 997 // list verification in non-product builds (and it can be enabled in | |
| 998 // product builds by definning HEAP_REGION_SET_FORCE_VERIFY to be 1). | |
| 999 #if HEAP_REGION_SET_FORCE_VERIFY | |
| 1000 void verify_region_sets_optional() { | |
| 1001 verify_region_sets(); | |
| 1002 } | |
| 1003 #else // HEAP_REGION_SET_FORCE_VERIFY | |
| 1004 void verify_region_sets_optional() { } | |
| 1005 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
| 342 | 1006 |
| 2152 | 1007 #ifdef ASSERT |
| 2361 | 1008 bool is_on_master_free_list(HeapRegion* hr) { |
| 2152 | 1009 return hr->containing_set() == &_free_list; |
| 1010 } | |
| 342 | 1011 |
| 2361 | 1012 bool is_in_humongous_set(HeapRegion* hr) { |
| 2152 | 1013 return hr->containing_set() == &_humongous_set; |
| 2361 | 1014 } |
| 2152 | 1015 #endif // ASSERT |
| 342 | 1016 |
| 2152 | 1017 // Wrapper for the region list operations that can be called from |
| 1018 // methods outside this class. | |
| 342 | 1019 |
| 2152 | 1020 void secondary_free_list_add_as_tail(FreeRegionList* list) { |
| 1021 _secondary_free_list.add_as_tail(list); | |
| 1022 } | |
| 342 | 1023 |
| 2152 | 1024 void append_secondary_free_list() { |
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1025 _free_list.add_as_head(&_secondary_free_list); |
| 2152 | 1026 } |
| 342 | 1027 |
| 2361 | 1028 void append_secondary_free_list_if_not_empty_with_lock() { |
| 1029 // If the secondary free list looks empty there's no reason to | |
| 1030 // take the lock and then try to append it. | |
| 2152 | 1031 if (!_secondary_free_list.is_empty()) { |
| 1032 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 1033 append_secondary_free_list(); | |
| 1034 } | |
| 1035 } | |
| 342 | 1036 |
| 2152 | 1037 void set_free_regions_coming(); |
| 1038 void reset_free_regions_coming(); | |
| 1039 bool free_regions_coming() { return _free_regions_coming; } | |
| 1040 void wait_while_free_regions_coming(); | |
| 342 | 1041 |
| 1042 // Perform a collection of the heap; intended for use in implementing | |
| 1043 // "System.gc". This probably implies as full a collection as the | |
| 1044 // "CollectedHeap" supports. | |
| 1045 virtual void collect(GCCause::Cause cause); | |
| 1046 | |
| 1047 // The same as above but assume that the caller holds the Heap_lock. | |
| 1048 void collect_locked(GCCause::Cause cause); | |
| 1049 | |
| 1050 // This interface assumes that it's being called by the | |
| 1051 // vm thread. It collects the heap assuming that the | |
| 1052 // heap lock is already held and that we are executing in | |
| 1053 // the context of the vm thread. | |
| 1054 virtual void collect_as_vm_thread(GCCause::Cause cause); | |
| 1055 | |
| 1056 // True iff a evacuation has failed in the most-recent collection. | |
| 1057 bool evacuation_failed() { return _evacuation_failed; } | |
| 1058 | |
| 2152 | 1059 // It will free a region if it has allocated objects in it that are |
| 1060 // all dead. It calls either free_region() or | |
| 1061 // free_humongous_region() depending on the type of the region that | |
| 1062 // is passed to it. | |
| 2173 | 1063 void free_region_if_empty(HeapRegion* hr, |
| 1064 size_t* pre_used, | |
| 1065 FreeRegionList* free_list, | |
| 1066 HumongousRegionSet* humongous_proxy_set, | |
| 1067 HRRSCleanupTask* hrrs_cleanup_task, | |
| 1068 bool par); | |
| 342 | 1069 |
| 2152 | 1070 // It appends the free list to the master free list and updates the |
| 1071 // master humongous list according to the contents of the proxy | |
| 1072 // list. It also adjusts the total used bytes according to pre_used | |
| 1073 // (if par is true, it will do so by taking the ParGCRareEvent_lock). | |
| 1074 void update_sets_after_freeing_regions(size_t pre_used, | |
| 1075 FreeRegionList* free_list, | |
| 1076 HumongousRegionSet* humongous_proxy_set, | |
| 1077 bool par); | |
| 342 | 1078 |
| 1079 // Returns "TRUE" iff "p" points into the allocated area of the heap. | |
| 1080 virtual bool is_in(const void* p) const; | |
| 1081 | |
| 1082 // Return "TRUE" iff the given object address is within the collection | |
| 1083 // set. | |
| 1084 inline bool obj_in_cs(oop obj); | |
| 1085 | |
| 1086 // Return "TRUE" iff the given object address is in the reserved | |
| 1087 // region of g1 (excluding the permanent generation). | |
| 1088 bool is_in_g1_reserved(const void* p) const { | |
| 1089 return _g1_reserved.contains(p); | |
| 1090 } | |
| 1091 | |
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1092 // Returns a MemRegion that corresponds to the space that has been |
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1093 // reserved for the heap |
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1094 MemRegion g1_reserved() { |
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1095 return _g1_reserved; |
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1096 } |
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1097 |
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1098 // Returns a MemRegion that corresponds to the space that has been |
| 342 | 1099 // committed in the heap |
| 1100 MemRegion g1_committed() { | |
| 1101 return _g1_committed; | |
| 1102 } | |
| 1103 | |
| 2311 | 1104 virtual bool is_in_closed_subset(const void* p) const; |
| 342 | 1105 |
| 1106 // Dirty card table entries covering a list of young regions. | |
| 1107 void dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list); | |
| 1108 | |
| 1109 // This resets the card table to all zeros. It is used after | |
| 1110 // a collection pause which used the card table to claim cards. | |
| 1111 void cleanUpCardTable(); | |
| 1112 | |
| 1113 // Iteration functions. | |
| 1114 | |
| 1115 // Iterate over all the ref-containing fields of all objects, calling | |
| 1116 // "cl.do_oop" on each. | |
| 678 | 1117 virtual void oop_iterate(OopClosure* cl) { |
| 1118 oop_iterate(cl, true); | |
| 1119 } | |
| 1120 void oop_iterate(OopClosure* cl, bool do_perm); | |
| 342 | 1121 |
| 1122 // Same as above, restricted to a memory region. | |
| 678 | 1123 virtual void oop_iterate(MemRegion mr, OopClosure* cl) { |
| 1124 oop_iterate(mr, cl, true); | |
| 1125 } | |
| 1126 void oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm); | |
| 342 | 1127 |
| 1128 // Iterate over all objects, calling "cl.do_object" on each. | |
| 678 | 1129 virtual void object_iterate(ObjectClosure* cl) { |
| 1130 object_iterate(cl, true); | |
| 1131 } | |
| 1132 virtual void safe_object_iterate(ObjectClosure* cl) { | |
| 1133 object_iterate(cl, true); | |
| 1134 } | |
| 1135 void object_iterate(ObjectClosure* cl, bool do_perm); | |
| 342 | 1136 |
| 1137 // Iterate over all objects allocated since the last collection, calling | |
| 1138 // "cl.do_object" on each. The heap must have been initialized properly | |
| 1139 // to support this function, or else this call will fail. | |
| 1140 virtual void object_iterate_since_last_GC(ObjectClosure* cl); | |
| 1141 | |
| 1142 // Iterate over all spaces in use in the heap, in ascending address order. | |
| 1143 virtual void space_iterate(SpaceClosure* cl); | |
| 1144 | |
| 1145 // Iterate over heap regions, in address order, terminating the | |
| 1146 // iteration early if the "doHeapRegion" method returns "true". | |
| 1147 void heap_region_iterate(HeapRegionClosure* blk); | |
| 1148 | |
| 1149 // Iterate over heap regions starting with r (or the first region if "r" | |
| 1150 // is NULL), in address order, terminating early if the "doHeapRegion" | |
| 1151 // method returns "true". | |
| 1152 void heap_region_iterate_from(HeapRegion* r, HeapRegionClosure* blk); | |
| 1153 | |
| 1154 // As above but starting from the region at index idx. | |
| 1155 void heap_region_iterate_from(int idx, HeapRegionClosure* blk); | |
| 1156 | |
| 1157 HeapRegion* region_at(size_t idx); | |
| 1158 | |
| 1159 // Divide the heap region sequence into "chunks" of some size (the number | |
| 1160 // of regions divided by the number of parallel threads times some | |
| 1161 // overpartition factor, currently 4). Assumes that this will be called | |
| 1162 // in parallel by ParallelGCThreads worker threads with discinct worker | |
| 1163 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
| 1164 // calls will use the same "claim_value", and that that claim value is | |
| 1165 // different from the claim_value of any heap region before the start of | |
| 1166 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
| 1167 // attempting to claim the first region in each chunk, and, if | |
| 1168 // successful, applying the closure to each region in the chunk (and | |
| 1169 // setting the claim value of the second and subsequent regions of the | |
| 1170 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
| 1171 // i.e., that a closure never attempt to abort a traversal. | |
| 1172 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
| 1173 int worker, | |
| 1174 jint claim_value); | |
| 1175 | |
| 390 | 1176 // It resets all the region claim values to the default. |
| 1177 void reset_heap_region_claim_values(); | |
| 1178 | |
| 355 | 1179 #ifdef ASSERT |
| 1180 bool check_heap_region_claim_values(jint claim_value); | |
| 1181 #endif // ASSERT | |
| 1182 | |
| 342 | 1183 // Iterate over the regions (if any) in the current collection set. |
| 1184 void collection_set_iterate(HeapRegionClosure* blk); | |
| 1185 | |
| 1186 // As above but starting from region r | |
| 1187 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
| 1188 | |
| 1189 // Returns the first (lowest address) compactible space in the heap. | |
| 1190 virtual CompactibleSpace* first_compactible_space(); | |
| 1191 | |
| 1192 // A CollectedHeap will contain some number of spaces. This finds the | |
| 1193 // space containing a given address, or else returns NULL. | |
| 1194 virtual Space* space_containing(const void* addr) const; | |
| 1195 | |
| 1196 // A G1CollectedHeap will contain some number of heap regions. This | |
| 1197 // finds the region containing a given address, or else returns NULL. | |
| 1198 HeapRegion* heap_region_containing(const void* addr) const; | |
| 1199 | |
| 1200 // Like the above, but requires "addr" to be in the heap (to avoid a | |
| 1201 // null-check), and unlike the above, may return an continuing humongous | |
| 1202 // region. | |
| 1203 HeapRegion* heap_region_containing_raw(const void* addr) const; | |
| 1204 | |
| 1205 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
| 1206 // each address in the (reserved) heap is a member of exactly | |
| 1207 // one block. The defining characteristic of a block is that it is | |
| 1208 // possible to find its size, and thus to progress forward to the next | |
| 1209 // block. (Blocks may be of different sizes.) Thus, blocks may | |
| 1210 // represent Java objects, or they might be free blocks in a | |
| 1211 // free-list-based heap (or subheap), as long as the two kinds are | |
| 1212 // distinguishable and the size of each is determinable. | |
| 1213 | |
| 1214 // Returns the address of the start of the "block" that contains the | |
| 1215 // address "addr". We say "blocks" instead of "object" since some heaps | |
| 1216 // may not pack objects densely; a chunk may either be an object or a | |
| 1217 // non-object. | |
| 1218 virtual HeapWord* block_start(const void* addr) const; | |
| 1219 | |
| 1220 // Requires "addr" to be the start of a chunk, and returns its size. | |
| 1221 // "addr + size" is required to be the start of a new chunk, or the end | |
| 1222 // of the active area of the heap. | |
| 1223 virtual size_t block_size(const HeapWord* addr) const; | |
| 1224 | |
| 1225 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
| 1226 // the block is an object. | |
| 1227 virtual bool block_is_obj(const HeapWord* addr) const; | |
| 1228 | |
| 1229 // Does this heap support heap inspection? (+PrintClassHistogram) | |
| 1230 virtual bool supports_heap_inspection() const { return true; } | |
| 1231 | |
| 1232 // Section on thread-local allocation buffers (TLABs) | |
| 1233 // See CollectedHeap for semantics. | |
| 1234 | |
| 1235 virtual bool supports_tlab_allocation() const; | |
| 1236 virtual size_t tlab_capacity(Thread* thr) const; | |
| 1237 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
| 1238 | |
| 1239 // Can a compiler initialize a new object without store barriers? | |
| 1240 // This permission only extends from the creation of a new object | |
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1241 // via a TLAB up to the first subsequent safepoint. If such permission |
|
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1242 // is granted for this heap type, the compiler promises to call |
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1243 // defer_store_barrier() below on any slow path allocation of |
|
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1244 // a new object for which such initializing store barriers will |
|
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1245 // have been elided. G1, like CMS, allows this, but should be |
|
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1246 // ready to provide a compensating write barrier as necessary |
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1247 // if that storage came out of a non-young region. The efficiency |
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1248 // of this implementation depends crucially on being able to |
|
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1249 // answer very efficiently in constant time whether a piece of |
|
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1250 // storage in the heap comes from a young region or not. |
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1251 // See ReduceInitialCardMarks. |
| 342 | 1252 virtual bool can_elide_tlab_store_barriers() const { |
|
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1253 // 6920090: Temporarily disabled, because of lingering |
|
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1254 // instabilities related to RICM with G1. In the |
|
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1255 // interim, the option ReduceInitialCardMarksForG1 |
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1256 // below is left solely as a debugging device at least |
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1257 // until 6920109 fixes the instabilities. |
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1258 return ReduceInitialCardMarksForG1; |
|
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1259 } |
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1260 |
| 1166 | 1261 virtual bool card_mark_must_follow_store() const { |
| 1262 return true; | |
| 1263 } | |
| 1264 | |
|
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1265 bool is_in_young(oop obj) { |
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1266 HeapRegion* hr = heap_region_containing(obj); |
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1267 return hr != NULL && hr->is_young(); |
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1268 } |
|
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1269 |
|
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1270 #ifdef ASSERT |
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1271 virtual bool is_in_partial_collection(const void* p); |
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1272 #endif |
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1273 |
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1274 virtual bool is_scavengable(const void* addr); |
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1275 |
|
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1276 // We don't need barriers for initializing stores to objects |
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1277 // in the young gen: for the SATB pre-barrier, there is no |
|
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1278 // pre-value that needs to be remembered; for the remembered-set |
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1279 // update logging post-barrier, we don't maintain remembered set |
|
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1280 // information for young gen objects. Note that non-generational |
|
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1281 // G1 does not have any "young" objects, should not elide |
|
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1282 // the rs logging barrier and so should always answer false below. |
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1283 // However, non-generational G1 (-XX:-G1Gen) appears to have |
|
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1284 // bit-rotted so was not tested below. |
|
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1285 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
|
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1286 // Re 6920090, 6920109 above. |
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1287 assert(ReduceInitialCardMarksForG1, "Else cannot be here"); |
|
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1288 assert(G1Gen || !is_in_young(new_obj), |
|
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1289 "Non-generational G1 should never return true below"); |
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1290 return is_in_young(new_obj); |
| 342 | 1291 } |
| 1292 | |
| 1293 // Can a compiler elide a store barrier when it writes | |
| 1294 // a permanent oop into the heap? Applies when the compiler | |
| 1295 // is storing x to the heap, where x->is_perm() is true. | |
| 1296 virtual bool can_elide_permanent_oop_store_barriers() const { | |
| 1297 // At least until perm gen collection is also G1-ified, at | |
| 1298 // which point this should return false. | |
| 1299 return true; | |
| 1300 } | |
| 1301 | |
| 1302 // The boundary between a "large" and "small" array of primitives, in | |
| 1303 // words. | |
| 1304 virtual size_t large_typearray_limit(); | |
| 1305 | |
| 1306 // Returns "true" iff the given word_size is "very large". | |
| 1307 static bool isHumongous(size_t word_size) { | |
|
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1308 // Note this has to be strictly greater-than as the TLABs |
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1309 // are capped at the humongous thresold and we want to |
|
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1310 // ensure that we don't try to allocate a TLAB as |
|
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1311 // humongous and that we don't allocate a humongous |
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1312 // object in a TLAB. |
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1313 return word_size > _humongous_object_threshold_in_words; |
| 342 | 1314 } |
| 1315 | |
| 1316 // Update mod union table with the set of dirty cards. | |
| 1317 void updateModUnion(); | |
| 1318 | |
| 1319 // Set the mod union bits corresponding to the given memRegion. Note | |
| 1320 // that this is always a safe operation, since it doesn't clear any | |
| 1321 // bits. | |
| 1322 void markModUnionRange(MemRegion mr); | |
| 1323 | |
| 1324 // Records the fact that a marking phase is no longer in progress. | |
| 1325 void set_marking_complete() { | |
| 1326 _mark_in_progress = false; | |
| 1327 } | |
| 1328 void set_marking_started() { | |
| 1329 _mark_in_progress = true; | |
| 1330 } | |
| 1331 bool mark_in_progress() { | |
| 1332 return _mark_in_progress; | |
| 1333 } | |
| 1334 | |
| 1335 // Print the maximum heap capacity. | |
| 1336 virtual size_t max_capacity() const; | |
| 1337 | |
| 1338 virtual jlong millis_since_last_gc(); | |
| 1339 | |
| 1340 // Perform any cleanup actions necessary before allowing a verification. | |
| 1341 virtual void prepare_for_verify(); | |
| 1342 | |
| 1343 // Perform verification. | |
| 811 | 1344 |
| 1345 // use_prev_marking == true -> use "prev" marking information, | |
| 1346 // use_prev_marking == false -> use "next" marking information | |
| 1347 // NOTE: Only the "prev" marking information is guaranteed to be | |
| 1348 // consistent most of the time, so most calls to this should use | |
| 1349 // use_prev_marking == true. Currently, there is only one case where | |
| 1350 // this is called with use_prev_marking == false, which is to verify | |
| 1351 // the "next" marking information at the end of remark. | |
| 1352 void verify(bool allow_dirty, bool silent, bool use_prev_marking); | |
| 1353 | |
| 1354 // Override; it uses the "prev" marking information | |
| 342 | 1355 virtual void verify(bool allow_dirty, bool silent); |
|
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1356 // Default behavior by calling print(tty); |
| 342 | 1357 virtual void print() const; |
|
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1358 // This calls print_on(st, PrintHeapAtGCExtended). |
| 342 | 1359 virtual void print_on(outputStream* st) const; |
|
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1360 // If extended is true, it will print out information for all |
|
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1361 // regions in the heap by calling print_on_extended(st). |
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1362 virtual void print_on(outputStream* st, bool extended) const; |
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1363 virtual void print_on_extended(outputStream* st) const; |
| 342 | 1364 |
| 1365 virtual void print_gc_threads_on(outputStream* st) const; | |
| 1366 virtual void gc_threads_do(ThreadClosure* tc) const; | |
| 1367 | |
| 1368 // Override | |
| 1369 void print_tracing_info() const; | |
| 1370 | |
| 1371 // If "addr" is a pointer into the (reserved?) heap, returns a positive | |
| 1372 // number indicating the "arena" within the heap in which "addr" falls. | |
| 1373 // Or else returns 0. | |
| 1374 virtual int addr_to_arena_id(void* addr) const; | |
| 1375 | |
| 1376 // Convenience function to be used in situations where the heap type can be | |
| 1377 // asserted to be this type. | |
| 1378 static G1CollectedHeap* heap(); | |
| 1379 | |
| 1380 void empty_young_list(); | |
| 1381 | |
| 1382 void set_region_short_lived_locked(HeapRegion* hr); | |
| 1383 // add appropriate methods for any other surv rate groups | |
| 1384 | |
|
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1385 YoungList* young_list() { return _young_list; } |
| 342 | 1386 |
| 1387 // debugging | |
| 1388 bool check_young_list_well_formed() { | |
| 1389 return _young_list->check_list_well_formed(); | |
| 1390 } | |
|
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1391 |
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1392 bool check_young_list_empty(bool check_heap, |
| 342 | 1393 bool check_sample = true); |
| 1394 | |
| 1395 // *** Stuff related to concurrent marking. It's not clear to me that so | |
| 1396 // many of these need to be public. | |
| 1397 | |
| 1398 // The functions below are helper functions that a subclass of | |
| 1399 // "CollectedHeap" can use in the implementation of its virtual | |
| 1400 // functions. | |
| 1401 // This performs a concurrent marking of the live objects in a | |
| 1402 // bitmap off to the side. | |
| 1403 void doConcurrentMark(); | |
| 1404 | |
| 1405 // This is called from the marksweep collector which then does | |
| 1406 // a concurrent mark and verifies that the results agree with | |
| 1407 // the stop the world marking. | |
| 1408 void checkConcurrentMark(); | |
| 1409 void do_sync_mark(); | |
| 1410 | |
| 1411 bool isMarkedPrev(oop obj) const; | |
| 1412 bool isMarkedNext(oop obj) const; | |
| 1413 | |
| 811 | 1414 // use_prev_marking == true -> use "prev" marking information, |
| 1415 // use_prev_marking == false -> use "next" marking information | |
| 1416 bool is_obj_dead_cond(const oop obj, | |
| 1417 const HeapRegion* hr, | |
| 1418 const bool use_prev_marking) const { | |
| 1419 if (use_prev_marking) { | |
| 1420 return is_obj_dead(obj, hr); | |
| 1421 } else { | |
| 1422 return is_obj_ill(obj, hr); | |
| 1423 } | |
| 1424 } | |
| 1425 | |
| 342 | 1426 // Determine if an object is dead, given the object and also |
| 1427 // the region to which the object belongs. An object is dead | |
| 1428 // iff a) it was not allocated since the last mark and b) it | |
| 1429 // is not marked. | |
| 1430 | |
| 1431 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
| 1432 return | |
| 1433 !hr->obj_allocated_since_prev_marking(obj) && | |
| 1434 !isMarkedPrev(obj); | |
| 1435 } | |
| 1436 | |
| 1437 // This is used when copying an object to survivor space. | |
| 1438 // If the object is marked live, then we mark the copy live. | |
| 1439 // If the object is allocated since the start of this mark | |
| 1440 // cycle, then we mark the copy live. | |
| 1441 // If the object has been around since the previous mark | |
| 1442 // phase, and hasn't been marked yet during this phase, | |
| 1443 // then we don't mark it, we just wait for the | |
| 1444 // current marking cycle to get to it. | |
| 1445 | |
| 1446 // This function returns true when an object has been | |
| 1447 // around since the previous marking and hasn't yet | |
| 1448 // been marked during this marking. | |
| 1449 | |
| 1450 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
| 1451 return | |
| 1452 !hr->obj_allocated_since_next_marking(obj) && | |
| 1453 !isMarkedNext(obj); | |
| 1454 } | |
| 1455 | |
| 1456 // Determine if an object is dead, given only the object itself. | |
| 1457 // This will find the region to which the object belongs and | |
| 1458 // then call the region version of the same function. | |
| 1459 | |
| 1460 // Added if it is in permanent gen it isn't dead. | |
| 1461 // Added if it is NULL it isn't dead. | |
| 1462 | |
| 811 | 1463 // use_prev_marking == true -> use "prev" marking information, |
| 1464 // use_prev_marking == false -> use "next" marking information | |
| 1465 bool is_obj_dead_cond(const oop obj, | |
| 1466 const bool use_prev_marking) { | |
| 1467 if (use_prev_marking) { | |
| 1468 return is_obj_dead(obj); | |
| 1469 } else { | |
| 1470 return is_obj_ill(obj); | |
| 1471 } | |
| 1472 } | |
| 1473 | |
| 1474 bool is_obj_dead(const oop obj) { | |
| 1475 const HeapRegion* hr = heap_region_containing(obj); | |
| 342 | 1476 if (hr == NULL) { |
| 1477 if (Universe::heap()->is_in_permanent(obj)) | |
| 1478 return false; | |
| 1479 else if (obj == NULL) return false; | |
| 1480 else return true; | |
| 1481 } | |
| 1482 else return is_obj_dead(obj, hr); | |
| 1483 } | |
| 1484 | |
| 811 | 1485 bool is_obj_ill(const oop obj) { |
| 1486 const HeapRegion* hr = heap_region_containing(obj); | |
| 342 | 1487 if (hr == NULL) { |
| 1488 if (Universe::heap()->is_in_permanent(obj)) | |
| 1489 return false; | |
| 1490 else if (obj == NULL) return false; | |
| 1491 else return true; | |
| 1492 } | |
| 1493 else return is_obj_ill(obj, hr); | |
| 1494 } | |
| 1495 | |
| 1496 // The following is just to alert the verification code | |
| 1497 // that a full collection has occurred and that the | |
| 1498 // remembered sets are no longer up to date. | |
| 1499 bool _full_collection; | |
| 1500 void set_full_collection() { _full_collection = true;} | |
| 1501 void clear_full_collection() {_full_collection = false;} | |
| 1502 bool full_collection() {return _full_collection;} | |
| 1503 | |
| 1504 ConcurrentMark* concurrent_mark() const { return _cm; } | |
| 1505 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
| 1506 | |
|
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1507 // The dirty cards region list is used to record a subset of regions |
|
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1508 // whose cards need clearing. The list if populated during the |
|
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1509 // remembered set scanning and drained during the card table |
|
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|
1510 // cleanup. Although the methods are reentrant, population/draining |
|
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|
1511 // phases must not overlap. For synchronization purposes the last |
|
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|
1512 // element on the list points to itself. |
|
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|
1513 HeapRegion* _dirty_cards_region_list; |
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|
1514 void push_dirty_cards_region(HeapRegion* hr); |
|
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1515 HeapRegion* pop_dirty_cards_region(); |
|
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1516 |
| 342 | 1517 public: |
| 1518 void stop_conc_gc_threads(); | |
| 1519 | |
| 1520 // <NEW PREDICTION> | |
| 1521 | |
| 1522 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
| 1523 void check_if_region_is_too_expensive(double predicted_time_ms); | |
| 1524 size_t pending_card_num(); | |
| 1525 size_t max_pending_card_num(); | |
| 1526 size_t cards_scanned(); | |
| 1527 | |
| 1528 // </NEW PREDICTION> | |
| 1529 | |
| 1530 protected: | |
| 1531 size_t _max_heap_capacity; | |
| 1532 }; | |
| 1533 | |
|
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|
1534 #define use_local_bitmaps 1 |
|
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|
1535 #define verify_local_bitmaps 0 |
|
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1536 #define oop_buffer_length 256 |
|
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|
1537 |
|
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|
1538 #ifndef PRODUCT |
|
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|
1539 class GCLabBitMap; |
|
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|
1540 class GCLabBitMapClosure: public BitMapClosure { |
|
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|
1541 private: |
|
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|
1542 ConcurrentMark* _cm; |
|
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|
1543 GCLabBitMap* _bitmap; |
|
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|
1544 |
|
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|
1545 public: |
|
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|
1546 GCLabBitMapClosure(ConcurrentMark* cm, |
|
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|
1547 GCLabBitMap* bitmap) { |
|
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|
1548 _cm = cm; |
|
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|
1549 _bitmap = bitmap; |
|
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|
1550 } |
|
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|
1551 |
|
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|
1552 virtual bool do_bit(size_t offset); |
|
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|
1553 }; |
|
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|
1554 #endif // !PRODUCT |
|
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|
1555 |
|
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|
1556 class GCLabBitMap: public BitMap { |
|
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1557 private: |
|
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|
1558 ConcurrentMark* _cm; |
|
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1559 |
|
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|
1560 int _shifter; |
|
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|
1561 size_t _bitmap_word_covers_words; |
|
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1562 |
|
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|
1563 // beginning of the heap |
|
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|
1564 HeapWord* _heap_start; |
|
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|
1565 |
|
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|
1566 // this is the actual start of the GCLab |
|
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|
1567 HeapWord* _real_start_word; |
|
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|
1568 |
|
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|
1569 // this is the actual end of the GCLab |
|
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|
1570 HeapWord* _real_end_word; |
|
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1571 |
|
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|
1572 // this is the first word, possibly located before the actual start |
|
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1573 // of the GCLab, that corresponds to the first bit of the bitmap |
|
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|
1574 HeapWord* _start_word; |
|
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|
1575 |
|
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|
1576 // size of a GCLab in words |
|
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|
1577 size_t _gclab_word_size; |
|
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|
1578 |
|
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|
1579 static int shifter() { |
|
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|
1580 return MinObjAlignment - 1; |
|
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|
1581 } |
|
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|
1582 |
|
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|
1583 // how many heap words does a single bitmap word corresponds to? |
|
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1584 static size_t bitmap_word_covers_words() { |
|
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|
1585 return BitsPerWord << shifter(); |
|
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|
1586 } |
|
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|
1587 |
|
1391
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|
1588 size_t gclab_word_size() const { |
|
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|
1589 return _gclab_word_size; |
|
845
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|
1590 } |
|
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|
1591 |
|
1391
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|
1592 // Calculates actual GCLab size in words |
|
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|
1593 size_t gclab_real_word_size() const { |
|
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|
1594 return bitmap_size_in_bits(pointer_delta(_real_end_word, _start_word)) |
|
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|
1595 / BitsPerWord; |
|
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1596 } |
|
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|
1597 |
|
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|
1598 static size_t bitmap_size_in_bits(size_t gclab_word_size) { |
|
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|
1599 size_t bits_in_bitmap = gclab_word_size >> shifter(); |
|
845
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|
1600 // We are going to ensure that the beginning of a word in this |
|
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|
1601 // bitmap also corresponds to the beginning of a word in the |
|
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|
1602 // global marking bitmap. To handle the case where a GCLab |
|
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|
1603 // starts from the middle of the bitmap, we need to add enough |
|
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|
1604 // space (i.e. up to a bitmap word) to ensure that we have |
|
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|
1605 // enough bits in the bitmap. |
|
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|
1606 return bits_in_bitmap + BitsPerWord - 1; |
|
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|
1607 } |
|
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|
1608 public: |
|
1391
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|
1609 GCLabBitMap(HeapWord* heap_start, size_t gclab_word_size) |
|
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|
1610 : BitMap(bitmap_size_in_bits(gclab_word_size)), |
|
845
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|
1611 _cm(G1CollectedHeap::heap()->concurrent_mark()), |
|
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|
1612 _shifter(shifter()), |
|
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|
1613 _bitmap_word_covers_words(bitmap_word_covers_words()), |
|
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|
1614 _heap_start(heap_start), |
|
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|
1615 _gclab_word_size(gclab_word_size), |
|
845
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|
1616 _real_start_word(NULL), |
|
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|
1617 _real_end_word(NULL), |
|
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|
1618 _start_word(NULL) |
|
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|
1619 { |
|
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|
1620 guarantee( size_in_words() >= bitmap_size_in_words(), |
|
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|
1621 "just making sure"); |
|
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|
1622 } |
|
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|
1623 |
|
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|
1624 inline unsigned heapWordToOffset(HeapWord* addr) { |
|
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|
1625 unsigned offset = (unsigned) pointer_delta(addr, _start_word) >> _shifter; |
|
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|
1626 assert(offset < size(), "offset should be within bounds"); |
|
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|
1627 return offset; |
|
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|
1628 } |
|
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|
1629 |
|
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|
1630 inline HeapWord* offsetToHeapWord(size_t offset) { |
|
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|
1631 HeapWord* addr = _start_word + (offset << _shifter); |
|
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|
1632 assert(_real_start_word <= addr && addr < _real_end_word, "invariant"); |
|
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|
1633 return addr; |
|
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|
1634 } |
|
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|
1635 |
|
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|
1636 bool fields_well_formed() { |
|
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|
1637 bool ret1 = (_real_start_word == NULL) && |
|
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|
1638 (_real_end_word == NULL) && |
|
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|
1639 (_start_word == NULL); |
|
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|
1640 if (ret1) |
|
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|
1641 return true; |
|
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|
1642 |
|
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|
1643 bool ret2 = _real_start_word >= _start_word && |
|
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|
1644 _start_word < _real_end_word && |
|
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|
1645 (_real_start_word + _gclab_word_size) == _real_end_word && |
|
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|
1646 (_start_word + _gclab_word_size + _bitmap_word_covers_words) |
|
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|
1647 > _real_end_word; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1648 return ret2; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1649 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1650 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1651 inline bool mark(HeapWord* addr) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1652 guarantee(use_local_bitmaps, "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1653 assert(fields_well_formed(), "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1654 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1655 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
|
1656 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
|
1657 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1658 // first mark it on the bitmap |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1659 at_put(heapWordToOffset(addr), true); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1660 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1661 return true; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1662 } else { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1663 return false; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1664 } |
|
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 isMarked(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 return at(heapWordToOffset(addr)); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1672 } |
|
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 void set_buffer(HeapWord* start) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1675 guarantee(use_local_bitmaps, "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1676 clear(); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1677 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1678 assert(start != NULL, "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1679 _real_start_word = start; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1680 _real_end_word = start + _gclab_word_size; |
|
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 size_t diff = |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1683 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
|
1684 _start_word = start - diff; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1685 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1686 assert(fields_well_formed(), "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1687 } |
|
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 #ifndef PRODUCT |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1690 void verify() { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1691 // verify that the marks have been propagated |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1692 GCLabBitMapClosure cl(_cm, this); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1693 iterate(&cl); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1694 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1695 #endif // PRODUCT |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1696 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1697 void retire() { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1698 guarantee(use_local_bitmaps, "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1699 assert(fields_well_formed(), "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1700 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1701 if (_start_word != NULL) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1702 CMBitMap* mark_bitmap = _cm->nextMarkBitMap(); |
|
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 // 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
|
1705 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
|
1706 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1707 mark_bitmap->mostly_disjoint_range_union(this, |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1708 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
|
1709 _start_word, |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1710 gclab_real_word_size()); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1711 _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
|
1712 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1713 #ifndef PRODUCT |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1714 if (use_local_bitmaps && verify_local_bitmaps) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1715 verify(); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1716 #endif // PRODUCT |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1717 } else { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1718 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
|
1719 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1720 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1721 |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1722 size_t bitmap_size_in_words() const { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1723 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
|
1724 } |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1725 |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1726 }; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1727 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1728 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1729 private: |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1730 bool _retired; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1731 bool _during_marking; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1732 GCLabBitMap _bitmap; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1733 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1734 public: |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1735 G1ParGCAllocBuffer(size_t gclab_word_size) : |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1736 ParGCAllocBuffer(gclab_word_size), |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1737 _during_marking(G1CollectedHeap::heap()->mark_in_progress()), |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1738 _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
|
1739 _retired(false) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1740 { } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1741 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1742 inline bool mark(HeapWord* addr) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1743 guarantee(use_local_bitmaps, "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1744 assert(_during_marking, "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1745 return _bitmap.mark(addr); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1746 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1747 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1748 inline void set_buf(HeapWord* buf) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1749 if (use_local_bitmaps && _during_marking) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1750 _bitmap.set_buffer(buf); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1751 ParGCAllocBuffer::set_buf(buf); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1752 _retired = false; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1753 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1754 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1755 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
|
1756 if (_retired) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1757 return; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1758 if (use_local_bitmaps && _during_marking) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1759 _bitmap.retire(); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1760 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1761 ParGCAllocBuffer::retire(end_of_gc, retain); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1762 _retired = true; |
|
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 }; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1765 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1766 class G1ParScanThreadState : public StackObj { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1767 protected: |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1768 G1CollectedHeap* _g1h; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1769 RefToScanQueue* _refs; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1770 DirtyCardQueue _dcq; |
|
df6caf649ff7
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1771 CardTableModRefBS* _ct_bs; |
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1772 G1RemSet* _g1_rem; |
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1773 |
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1774 G1ParGCAllocBuffer _surviving_alloc_buffer; |
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1775 G1ParGCAllocBuffer _tenured_alloc_buffer; |
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1776 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount]; |
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1777 ageTable _age_table; |
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1778 |
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1779 size_t _alloc_buffer_waste; |
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1780 size_t _undo_waste; |
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1781 |
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1782 OopsInHeapRegionClosure* _evac_failure_cl; |
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1783 G1ParScanHeapEvacClosure* _evac_cl; |
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1784 G1ParScanPartialArrayClosure* _partial_scan_cl; |
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1785 |
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1786 int _hash_seed; |
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1787 int _queue_num; |
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1788 |
| 1611 | 1789 size_t _term_attempts; |
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1790 |
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1791 double _start; |
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1792 double _start_strong_roots; |
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1793 double _strong_roots_time; |
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1794 double _start_term; |
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1795 double _term_time; |
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1796 |
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1797 // Map from young-age-index (0 == not young, 1 is youngest) to |
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1798 // surviving words. base is what we get back from the malloc call |
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1799 size_t* _surviving_young_words_base; |
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1800 // this points into the array, as we use the first few entries for padding |
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1801 size_t* _surviving_young_words; |
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1802 |
| 1709 | 1803 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
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1804 |
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1805 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1806 |
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1807 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1808 |
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1809 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
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1810 CardTableModRefBS* ctbs() { return _ct_bs; } |
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1811 |
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1812 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
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1813 if (!from->is_survivor()) { |
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1814 _g1_rem->par_write_ref(from, p, tid); |
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1815 } |
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1816 } |
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1817 |
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1818 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
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1819 // If the new value of the field points to the same region or |
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1820 // is the to-space, we don't need to include it in the Rset updates. |
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1821 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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1822 size_t card_index = ctbs()->index_for(p); |
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1823 // If the card hasn't been added to the buffer, do it. |
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1824 if (ctbs()->mark_card_deferred(card_index)) { |
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1825 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1826 } |
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1827 } |
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1828 } |
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1829 |
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1830 public: |
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1831 G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num); |
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1832 |
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1833 ~G1ParScanThreadState() { |
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1834 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base); |
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1835 } |
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1836 |
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1837 RefToScanQueue* refs() { return _refs; } |
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1838 ageTable* age_table() { return &_age_table; } |
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1839 |
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1840 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
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1841 return _alloc_buffers[purpose]; |
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1842 } |
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1843 |
| 1709 | 1844 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
| 1845 size_t undo_waste() const { return _undo_waste; } | |
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1846 |
|
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|
1847 #ifdef ASSERT |
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1848 bool verify_ref(narrowOop* ref) const; |
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1849 bool verify_ref(oop* ref) const; |
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1850 bool verify_task(StarTask ref) const; |
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|
1851 #endif // ASSERT |
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1852 |
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1853 template <class T> void push_on_queue(T* ref) { |
|
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1854 assert(verify_ref(ref), "sanity"); |
| 1709 | 1855 refs()->push(ref); |
|
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1856 } |
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1857 |
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1858 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
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1859 if (G1DeferredRSUpdate) { |
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1860 deferred_rs_update(from, p, tid); |
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1861 } else { |
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1862 immediate_rs_update(from, p, tid); |
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1863 } |
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1864 } |
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1865 |
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1866 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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1867 |
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1868 HeapWord* obj = NULL; |
|
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1869 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
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1870 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
|
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1871 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
|
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1872 assert(gclab_word_size == alloc_buf->word_sz(), |
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1873 "dynamic resizing is not supported"); |
|
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1874 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
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1875 alloc_buf->retire(false, false); |
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1876 |
|
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1877 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
|
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1878 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
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1879 // Otherwise. |
|
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1880 alloc_buf->set_buf(buf); |
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1881 |
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1882 obj = alloc_buf->allocate(word_sz); |
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1883 assert(obj != NULL, "buffer was definitely big enough..."); |
|
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1884 } else { |
|
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1885 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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1886 } |
|
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1887 return obj; |
|
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1888 } |
|
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1889 |
|
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1890 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
|
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1891 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1892 if (obj != NULL) return obj; |
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1893 return allocate_slow(purpose, word_sz); |
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1894 } |
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1895 |
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1896 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
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1897 if (alloc_buffer(purpose)->contains(obj)) { |
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1898 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
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1899 "should contain whole object"); |
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1900 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
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1901 } else { |
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1902 CollectedHeap::fill_with_object(obj, word_sz); |
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1903 add_to_undo_waste(word_sz); |
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1904 } |
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1905 } |
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1906 |
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1907 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
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1908 _evac_failure_cl = evac_failure_cl; |
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1909 } |
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1910 OopsInHeapRegionClosure* evac_failure_closure() { |
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1911 return _evac_failure_cl; |
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1912 } |
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1913 |
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1914 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
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1915 _evac_cl = evac_cl; |
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1916 } |
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1917 |
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1918 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
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1919 _partial_scan_cl = partial_scan_cl; |
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1920 } |
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1921 |
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1922 int* hash_seed() { return &_hash_seed; } |
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1923 int queue_num() { return _queue_num; } |
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1924 |
| 1709 | 1925 size_t term_attempts() const { return _term_attempts; } |
| 1611 | 1926 void note_term_attempt() { _term_attempts++; } |
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1927 |
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1928 void start_strong_roots() { |
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1929 _start_strong_roots = os::elapsedTime(); |
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1930 } |
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1931 void end_strong_roots() { |
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1932 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
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1933 } |
| 1709 | 1934 double strong_roots_time() const { return _strong_roots_time; } |
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1935 |
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1936 void start_term_time() { |
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1937 note_term_attempt(); |
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1938 _start_term = os::elapsedTime(); |
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1939 } |
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1940 void end_term_time() { |
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1941 _term_time += (os::elapsedTime() - _start_term); |
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1942 } |
| 1709 | 1943 double term_time() const { return _term_time; } |
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1944 |
| 1709 | 1945 double elapsed_time() const { |
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1946 return os::elapsedTime() - _start; |
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1947 } |
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1948 |
| 1709 | 1949 static void |
| 1950 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 1951 void | |
| 1952 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
| 1953 | |
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1954 size_t* surviving_young_words() { |
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1955 // We add on to hide entry 0 which accumulates surviving words for |
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1956 // age -1 regions (i.e. non-young ones) |
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1957 return _surviving_young_words; |
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1958 } |
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1959 |
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1960 void retire_alloc_buffers() { |
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1961 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
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1962 size_t waste = _alloc_buffers[ap]->words_remaining(); |
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1963 add_to_alloc_buffer_waste(waste); |
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1964 _alloc_buffers[ap]->retire(true, false); |
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1965 } |
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1966 } |
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1967 |
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1968 template <class T> void deal_with_reference(T* ref_to_scan) { |
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1969 if (has_partial_array_mask(ref_to_scan)) { |
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1970 _partial_scan_cl->do_oop_nv(ref_to_scan); |
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1971 } else { |
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1972 // Note: we can use "raw" versions of "region_containing" because |
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1973 // "obj_to_scan" is definitely in the heap, and is not in a |
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1974 // humongous region. |
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1975 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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1976 _evac_cl->set_region(r); |
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1977 _evac_cl->do_oop_nv(ref_to_scan); |
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1978 } |
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1979 } |
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1980 |
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1981 void deal_with_reference(StarTask ref) { |
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1982 assert(verify_task(ref), "sanity"); |
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1983 if (ref.is_narrow()) { |
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1984 deal_with_reference((narrowOop*)ref); |
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1985 } else { |
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1986 deal_with_reference((oop*)ref); |
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1987 } |
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1988 } |
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1989 |
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1990 public: |
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1991 void trim_queue(); |
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1992 }; |
| 1972 | 1993 |
| 1994 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |