Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 2173:97ba643ea3ed
7014261: G1: RSet-related failures
Summary: A race between the concurrent cleanup thread and the VM thread while it is processing the "expanded sparse table list" causes both threads to try to free the same sparse table entry and either causes one of the threads to fail or leaves the entry in an inconsistent state. The solution is purge all entries on the expanded list that correspond go regions that are being cleaned up.
Reviewed-by: brutisso, johnc
| author | tonyp |
|---|---|
| date | Tue, 25 Jan 2011 17:58:19 -0500 |
| parents | 0fa27f37d4d4 |
| children | c33825b68624 |
| 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" | |
| 29 #include "gc_implementation/g1/g1RemSet.hpp" | |
| 2152 | 30 #include "gc_implementation/g1/heapRegionSets.hpp" |
| 1972 | 31 #include "gc_implementation/parNew/parGCAllocBuffer.hpp" |
| 32 #include "memory/barrierSet.hpp" | |
| 33 #include "memory/memRegion.hpp" | |
| 34 #include "memory/sharedHeap.hpp" | |
| 35 | |
| 342 | 36 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. |
| 37 // It uses the "Garbage First" heap organization and algorithm, which | |
| 38 // may combine concurrent marking with parallel, incremental compaction of | |
| 39 // heap subsets that will yield large amounts of garbage. | |
| 40 | |
| 41 class HeapRegion; | |
| 42 class HeapRegionSeq; | |
| 2173 | 43 class HRRSCleanupTask; |
| 342 | 44 class PermanentGenerationSpec; |
| 45 class GenerationSpec; | |
| 46 class OopsInHeapRegionClosure; | |
| 47 class G1ScanHeapEvacClosure; | |
| 48 class ObjectClosure; | |
| 49 class SpaceClosure; | |
| 50 class CompactibleSpaceClosure; | |
| 51 class Space; | |
| 52 class G1CollectorPolicy; | |
| 53 class GenRemSet; | |
| 54 class G1RemSet; | |
| 55 class HeapRegionRemSetIterator; | |
| 56 class ConcurrentMark; | |
| 57 class ConcurrentMarkThread; | |
| 58 class ConcurrentG1Refine; | |
| 59 class ConcurrentZFThread; | |
| 60 | |
| 1709 | 61 typedef OverflowTaskQueue<StarTask> RefToScanQueue; |
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62 typedef GenericTaskQueueSet<RefToScanQueue> RefToScanQueueSet; |
| 342 | 63 |
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64 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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65 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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66 |
| 342 | 67 enum G1GCThreadGroups { |
| 68 G1CRGroup = 0, | |
| 69 G1ZFGroup = 1, | |
| 2152 | 70 G1CMGroup = 2 |
| 342 | 71 }; |
| 72 | |
| 73 enum GCAllocPurpose { | |
| 74 GCAllocForTenured, | |
| 75 GCAllocForSurvived, | |
| 76 GCAllocPurposeCount | |
| 77 }; | |
| 78 | |
| 79 class YoungList : public CHeapObj { | |
| 80 private: | |
| 81 G1CollectedHeap* _g1h; | |
| 82 | |
| 83 HeapRegion* _head; | |
| 84 | |
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85 HeapRegion* _survivor_head; |
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86 HeapRegion* _survivor_tail; |
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87 |
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88 HeapRegion* _curr; |
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89 |
| 342 | 90 size_t _length; |
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91 size_t _survivor_length; |
| 342 | 92 |
| 93 size_t _last_sampled_rs_lengths; | |
| 94 size_t _sampled_rs_lengths; | |
| 95 | |
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96 void empty_list(HeapRegion* list); |
| 342 | 97 |
| 98 public: | |
| 99 YoungList(G1CollectedHeap* g1h); | |
| 100 | |
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101 void push_region(HeapRegion* hr); |
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102 void add_survivor_region(HeapRegion* hr); |
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103 |
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104 void empty_list(); |
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105 bool is_empty() { return _length == 0; } |
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106 size_t length() { return _length; } |
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107 size_t survivor_length() { return _survivor_length; } |
| 342 | 108 |
| 109 void rs_length_sampling_init(); | |
| 110 bool rs_length_sampling_more(); | |
| 111 void rs_length_sampling_next(); | |
| 112 | |
| 113 void reset_sampled_info() { | |
| 114 _last_sampled_rs_lengths = 0; | |
| 115 } | |
| 116 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
| 117 | |
| 118 // for development purposes | |
| 119 void reset_auxilary_lists(); | |
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120 void clear() { _head = NULL; _length = 0; } |
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121 |
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122 void clear_survivors() { |
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123 _survivor_head = NULL; |
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124 _survivor_tail = NULL; |
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125 _survivor_length = 0; |
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126 } |
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127 |
| 342 | 128 HeapRegion* first_region() { return _head; } |
| 129 HeapRegion* first_survivor_region() { return _survivor_head; } | |
| 545 | 130 HeapRegion* last_survivor_region() { return _survivor_tail; } |
| 342 | 131 |
| 132 // debugging | |
| 133 bool check_list_well_formed(); | |
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134 bool check_list_empty(bool check_sample = true); |
| 342 | 135 void print(); |
| 136 }; | |
| 137 | |
| 138 class RefineCardTableEntryClosure; | |
| 139 class G1CollectedHeap : public SharedHeap { | |
| 140 friend class VM_G1CollectForAllocation; | |
| 141 friend class VM_GenCollectForPermanentAllocation; | |
| 142 friend class VM_G1CollectFull; | |
| 143 friend class VM_G1IncCollectionPause; | |
| 144 friend class VMStructs; | |
| 145 | |
| 146 // Closures used in implementation. | |
| 147 friend class G1ParCopyHelper; | |
| 148 friend class G1IsAliveClosure; | |
| 149 friend class G1EvacuateFollowersClosure; | |
| 150 friend class G1ParScanThreadState; | |
| 151 friend class G1ParScanClosureSuper; | |
| 152 friend class G1ParEvacuateFollowersClosure; | |
| 153 friend class G1ParTask; | |
| 154 friend class G1FreeGarbageRegionClosure; | |
| 155 friend class RefineCardTableEntryClosure; | |
| 156 friend class G1PrepareCompactClosure; | |
| 157 friend class RegionSorter; | |
| 2152 | 158 friend class RegionResetter; |
| 342 | 159 friend class CountRCClosure; |
| 160 friend class EvacPopObjClosure; | |
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161 friend class G1ParCleanupCTTask; |
| 342 | 162 |
| 163 // Other related classes. | |
| 164 friend class G1MarkSweep; | |
| 165 | |
| 166 private: | |
| 167 // The one and only G1CollectedHeap, so static functions can find it. | |
| 168 static G1CollectedHeap* _g1h; | |
| 169 | |
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170 static size_t _humongous_object_threshold_in_words; |
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171 |
| 342 | 172 // Storage for the G1 heap (excludes the permanent generation). |
| 173 VirtualSpace _g1_storage; | |
| 174 MemRegion _g1_reserved; | |
| 175 | |
| 176 // The part of _g1_storage that is currently committed. | |
| 177 MemRegion _g1_committed; | |
| 178 | |
| 179 // The maximum part of _g1_storage that has ever been committed. | |
| 180 MemRegion _g1_max_committed; | |
| 181 | |
| 2152 | 182 // The master free list. It will satisfy all new region allocations. |
| 183 MasterFreeRegionList _free_list; | |
| 184 | |
| 185 // The secondary free list which contains regions that have been | |
| 186 // freed up during the cleanup process. This will be appended to the | |
| 187 // master free list when appropriate. | |
| 188 SecondaryFreeRegionList _secondary_free_list; | |
| 189 | |
| 190 // It keeps track of the humongous regions. | |
| 191 MasterHumongousRegionSet _humongous_set; | |
| 342 | 192 |
| 193 // The number of regions we could create by expansion. | |
| 194 size_t _expansion_regions; | |
| 195 | |
| 196 // The block offset table for the G1 heap. | |
| 197 G1BlockOffsetSharedArray* _bot_shared; | |
| 198 | |
| 199 // Move all of the regions off the free lists, then rebuild those free | |
| 200 // lists, before and after full GC. | |
| 201 void tear_down_region_lists(); | |
| 202 void rebuild_region_lists(); | |
| 203 | |
| 204 // The sequence of all heap regions in the heap. | |
| 205 HeapRegionSeq* _hrs; | |
| 206 | |
| 207 // The region from which normal-sized objects are currently being | |
| 208 // allocated. May be NULL. | |
| 209 HeapRegion* _cur_alloc_region; | |
| 210 | |
| 211 // Postcondition: cur_alloc_region == NULL. | |
| 212 void abandon_cur_alloc_region(); | |
| 636 | 213 void abandon_gc_alloc_regions(); |
| 342 | 214 |
| 215 // The to-space memory regions into which objects are being copied during | |
| 216 // a GC. | |
| 217 HeapRegion* _gc_alloc_regions[GCAllocPurposeCount]; | |
| 545 | 218 size_t _gc_alloc_region_counts[GCAllocPurposeCount]; |
| 636 | 219 // These are the regions, one per GCAllocPurpose, that are half-full |
| 220 // at the end of a collection and that we want to reuse during the | |
| 221 // next collection. | |
| 222 HeapRegion* _retained_gc_alloc_regions[GCAllocPurposeCount]; | |
| 223 // This specifies whether we will keep the last half-full region at | |
| 224 // the end of a collection so that it can be reused during the next | |
| 225 // collection (this is specified per GCAllocPurpose) | |
| 226 bool _retain_gc_alloc_region[GCAllocPurposeCount]; | |
| 342 | 227 |
| 228 // A list of the regions that have been set to be alloc regions in the | |
| 229 // current collection. | |
| 230 HeapRegion* _gc_alloc_region_list; | |
| 231 | |
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232 // Determines PLAB size for a particular allocation purpose. |
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233 static size_t desired_plab_sz(GCAllocPurpose purpose); |
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234 |
| 2152 | 235 // When called by par thread, requires the FreeList_lock to be held. |
| 342 | 236 void push_gc_alloc_region(HeapRegion* hr); |
| 237 | |
| 238 // This should only be called single-threaded. Undeclares all GC alloc | |
| 239 // regions. | |
| 240 void forget_alloc_region_list(); | |
| 241 | |
| 242 // Should be used to set an alloc region, because there's other | |
| 243 // associated bookkeeping. | |
| 244 void set_gc_alloc_region(int purpose, HeapRegion* r); | |
| 245 | |
| 246 // Check well-formedness of alloc region list. | |
| 247 bool check_gc_alloc_regions(); | |
| 248 | |
| 249 // Outside of GC pauses, the number of bytes used in all regions other | |
| 250 // than the current allocation region. | |
| 251 size_t _summary_bytes_used; | |
| 252 | |
| 526 | 253 // This is used for a quick test on whether a reference points into |
| 254 // the collection set or not. Basically, we have an array, with one | |
| 255 // byte per region, and that byte denotes whether the corresponding | |
| 256 // region is in the collection set or not. The entry corresponding | |
| 257 // the bottom of the heap, i.e., region 0, is pointed to by | |
| 258 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
| 259 // biased so that it actually points to address 0 of the address | |
| 260 // space, to make the test as fast as possible (we can simply shift | |
| 261 // the address to address into it, instead of having to subtract the | |
| 262 // bottom of the heap from the address before shifting it; basically | |
| 263 // it works in the same way the card table works). | |
| 264 bool* _in_cset_fast_test; | |
| 265 | |
| 266 // The allocated array used for the fast test on whether a reference | |
| 267 // points into the collection set or not. This field is also used to | |
| 268 // free the array. | |
| 269 bool* _in_cset_fast_test_base; | |
| 270 | |
| 271 // The length of the _in_cset_fast_test_base array. | |
| 272 size_t _in_cset_fast_test_length; | |
| 273 | |
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274 volatile unsigned _gc_time_stamp; |
| 342 | 275 |
| 276 size_t* _surviving_young_words; | |
| 277 | |
| 278 void setup_surviving_young_words(); | |
| 279 void update_surviving_young_words(size_t* surv_young_words); | |
| 280 void cleanup_surviving_young_words(); | |
| 281 | |
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282 // It decides whether an explicit GC should start a concurrent cycle |
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283 // instead of doing a STW GC. Currently, a concurrent cycle is |
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284 // explicitly started if: |
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285 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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286 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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287 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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288 |
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289 // Keeps track of how many "full collections" (i.e., Full GCs or |
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290 // concurrent cycles) we have completed. The number of them we have |
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291 // started is maintained in _total_full_collections in CollectedHeap. |
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292 volatile unsigned int _full_collections_completed; |
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293 |
| 1973 | 294 // These are macros so that, if the assert fires, we get the correct |
| 295 // line number, file, etc. | |
| 296 | |
| 297 #define heap_locking_asserts_err_msg(__extra_message) \ | |
| 2152 | 298 err_msg("%s : Heap_lock locked: %s, at safepoint: %s, is VM thread: %s", \ |
| 1973 | 299 (__extra_message), \ |
| 2152 | 300 BOOL_TO_STR(Heap_lock->owned_by_self()), \ |
| 301 BOOL_TO_STR(SafepointSynchronize::is_at_safepoint()), \ | |
| 302 BOOL_TO_STR(Thread::current()->is_VM_thread())) | |
| 1973 | 303 |
| 304 #define assert_heap_locked() \ | |
| 305 do { \ | |
| 306 assert(Heap_lock->owned_by_self(), \ | |
| 307 heap_locking_asserts_err_msg("should be holding the Heap_lock")); \ | |
| 308 } while (0) | |
| 309 | |
| 2152 | 310 #define assert_heap_locked_or_at_safepoint(__should_be_vm_thread) \ |
| 1973 | 311 do { \ |
| 312 assert(Heap_lock->owned_by_self() || \ | |
| 2152 | 313 (SafepointSynchronize::is_at_safepoint() && \ |
| 314 ((__should_be_vm_thread) == Thread::current()->is_VM_thread())), \ | |
| 1973 | 315 heap_locking_asserts_err_msg("should be holding the Heap_lock or " \ |
| 316 "should be at a safepoint")); \ | |
| 317 } while (0) | |
| 318 | |
| 319 #define assert_heap_locked_and_not_at_safepoint() \ | |
| 320 do { \ | |
| 321 assert(Heap_lock->owned_by_self() && \ | |
| 322 !SafepointSynchronize::is_at_safepoint(), \ | |
| 323 heap_locking_asserts_err_msg("should be holding the Heap_lock and " \ | |
| 324 "should not be at a safepoint")); \ | |
| 325 } while (0) | |
| 326 | |
| 327 #define assert_heap_not_locked() \ | |
| 328 do { \ | |
| 329 assert(!Heap_lock->owned_by_self(), \ | |
| 330 heap_locking_asserts_err_msg("should not be holding the Heap_lock")); \ | |
| 331 } while (0) | |
| 332 | |
| 333 #define assert_heap_not_locked_and_not_at_safepoint() \ | |
| 334 do { \ | |
| 335 assert(!Heap_lock->owned_by_self() && \ | |
| 336 !SafepointSynchronize::is_at_safepoint(), \ | |
| 337 heap_locking_asserts_err_msg("should not be holding the Heap_lock and " \ | |
| 338 "should not be at a safepoint")); \ | |
| 339 } while (0) | |
| 340 | |
| 2152 | 341 #define assert_at_safepoint(__should_be_vm_thread) \ |
| 1973 | 342 do { \ |
| 2152 | 343 assert(SafepointSynchronize::is_at_safepoint() && \ |
| 344 ((__should_be_vm_thread) == Thread::current()->is_VM_thread()), \ | |
| 1973 | 345 heap_locking_asserts_err_msg("should be at a safepoint")); \ |
| 346 } while (0) | |
| 347 | |
| 348 #define assert_not_at_safepoint() \ | |
| 349 do { \ | |
| 350 assert(!SafepointSynchronize::is_at_safepoint(), \ | |
| 351 heap_locking_asserts_err_msg("should not be at a safepoint")); \ | |
| 352 } while (0) | |
| 353 | |
| 342 | 354 protected: |
| 355 | |
| 356 // Returns "true" iff none of the gc alloc regions have any allocations | |
| 357 // since the last call to "save_marks". | |
| 358 bool all_alloc_regions_no_allocs_since_save_marks(); | |
| 545 | 359 // Perform finalization stuff on all allocation regions. |
| 360 void retire_all_alloc_regions(); | |
| 342 | 361 |
| 362 // The number of regions allocated to hold humongous objects. | |
| 363 int _num_humongous_regions; | |
| 364 YoungList* _young_list; | |
| 365 | |
| 366 // The current policy object for the collector. | |
| 367 G1CollectorPolicy* _g1_policy; | |
| 368 | |
| 2152 | 369 // This is the second level of trying to allocate a new region. If |
| 370 // new_region_work didn't find a region in the free_list, this call | |
| 371 // will check whether there's anything available in the | |
| 372 // secondary_free_list and/or wait for more regions to appear in that | |
| 373 // list, if _free_regions_coming is set. | |
| 374 HeapRegion* new_region_try_secondary_free_list(size_t word_size); | |
| 342 | 375 |
| 2152 | 376 // It will try to allocate a single non-humongous HeapRegion |
| 377 // sufficient for an allocation of the given word_size. If | |
| 378 // do_expand is true, it will attempt to expand the heap if | |
| 379 // necessary to satisfy the allocation request. Note that word_size | |
| 380 // is only used to make sure that we expand sufficiently but, given | |
| 381 // that the allocation request is assumed not to be humongous, | |
| 382 // having word_size is not strictly necessary (expanding by a single | |
| 383 // region will always be sufficient). But let's keep that parameter | |
| 384 // in case we need it in the future. | |
| 385 HeapRegion* new_region_work(size_t word_size, bool do_expand); | |
| 342 | 386 |
| 2152 | 387 // It will try to allocate a new region to be used for allocation by |
| 388 // mutator threads. It will not try to expand the heap if not region | |
| 389 // is available. | |
| 390 HeapRegion* new_alloc_region(size_t word_size) { | |
| 391 return new_region_work(word_size, false /* do_expand */); | |
| 342 | 392 } |
| 2152 | 393 |
| 394 // It will try to allocate a new region to be used for allocation by | |
| 395 // a GC thread. It will try to expand the heap if no region is | |
| 396 // available. | |
| 397 HeapRegion* new_gc_alloc_region(int purpose, size_t word_size); | |
| 398 | |
| 399 int humongous_obj_allocate_find_first(size_t num_regions, size_t word_size); | |
| 342 | 400 |
| 401 // Attempt to allocate an object of the given (very large) "word_size". | |
| 402 // Returns "NULL" on failure. | |
| 2152 | 403 HeapWord* humongous_obj_allocate(size_t word_size); |
| 1973 | 404 |
| 405 // The following two methods, allocate_new_tlab() and | |
| 406 // mem_allocate(), are the two main entry points from the runtime | |
| 407 // into the G1's allocation routines. They have the following | |
| 408 // assumptions: | |
| 409 // | |
| 410 // * They should both be called outside safepoints. | |
| 411 // | |
| 412 // * They should both be called without holding the Heap_lock. | |
| 413 // | |
| 414 // * All allocation requests for new TLABs should go to | |
| 415 // allocate_new_tlab(). | |
| 416 // | |
| 417 // * All non-TLAB allocation requests should go to mem_allocate() | |
| 418 // and mem_allocate() should never be called with is_tlab == true. | |
| 419 // | |
| 420 // * If the GC locker is active we currently stall until we can | |
| 421 // allocate a new young region. This will be changed in the | |
| 422 // near future (see CR 6994056). | |
| 423 // | |
| 424 // * If either call cannot satisfy the allocation request using the | |
| 425 // current allocating region, they will try to get a new one. If | |
| 426 // this fails, they will attempt to do an evacuation pause and | |
| 427 // retry the allocation. | |
| 428 // | |
| 429 // * If all allocation attempts fail, even after trying to schedule | |
| 430 // an evacuation pause, allocate_new_tlab() will return NULL, | |
| 431 // whereas mem_allocate() will attempt a heap expansion and/or | |
| 432 // schedule a Full GC. | |
| 433 // | |
| 434 // * We do not allow humongous-sized TLABs. So, allocate_new_tlab | |
| 435 // should never be called with word_size being humongous. All | |
| 436 // humongous allocation requests should go to mem_allocate() which | |
| 437 // will satisfy them with a special path. | |
| 438 | |
| 439 virtual HeapWord* allocate_new_tlab(size_t word_size); | |
| 440 | |
| 441 virtual HeapWord* mem_allocate(size_t word_size, | |
| 442 bool is_noref, | |
| 443 bool is_tlab, /* expected to be false */ | |
| 444 bool* gc_overhead_limit_was_exceeded); | |
| 342 | 445 |
| 1973 | 446 // The following methods, allocate_from_cur_allocation_region(), |
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447 // attempt_allocation(), attempt_allocation_locked(), |
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448 // replace_cur_alloc_region_and_allocate(), |
| 1973 | 449 // attempt_allocation_slow(), and attempt_allocation_humongous() |
| 450 // have very awkward pre- and post-conditions with respect to | |
| 451 // locking: | |
| 452 // | |
| 453 // If they are called outside a safepoint they assume the caller | |
| 454 // holds the Heap_lock when it calls them. However, on exit they | |
| 455 // will release the Heap_lock if they return a non-NULL result, but | |
| 456 // keep holding the Heap_lock if they return a NULL result. The | |
| 457 // reason for this is that we need to dirty the cards that span | |
| 458 // allocated blocks on young regions to avoid having to take the | |
| 459 // slow path of the write barrier (for performance reasons we don't | |
| 460 // update RSets for references whose source is a young region, so we | |
| 461 // don't need to look at dirty cards on young regions). But, doing | |
| 462 // this card dirtying while holding the Heap_lock can be a | |
| 463 // scalability bottleneck, especially given that some allocation | |
| 464 // requests might be of non-trivial size (and the larger the region | |
| 465 // size is, the fewer allocations requests will be considered | |
| 466 // humongous, as the humongous size limit is a fraction of the | |
| 467 // region size). So, when one of these calls succeeds in allocating | |
| 468 // a block it does the card dirtying after it releases the Heap_lock | |
| 469 // which is why it will return without holding it. | |
| 470 // | |
| 471 // The above assymetry is the reason why locking / unlocking is done | |
| 472 // explicitly (i.e., with Heap_lock->lock() and | |
| 473 // Heap_lock->unlocked()) instead of using MutexLocker and | |
| 474 // MutexUnlocker objects. The latter would ensure that the lock is | |
| 475 // unlocked / re-locked at every possible exit out of the basic | |
| 476 // block. However, we only want that action to happen in selected | |
| 477 // places. | |
| 478 // | |
| 479 // Further, if the above methods are called during a safepoint, then | |
| 480 // naturally there's no assumption about the Heap_lock being held or | |
| 481 // there's no attempt to unlock it. The parameter at_safepoint | |
| 482 // indicates whether the call is made during a safepoint or not (as | |
| 483 // an optimization, to avoid reading the global flag with | |
| 484 // SafepointSynchronize::is_at_safepoint()). | |
| 485 // | |
| 486 // The methods share these parameters: | |
| 487 // | |
| 488 // * word_size : the size of the allocation request in words | |
| 489 // * at_safepoint : whether the call is done at a safepoint; this | |
| 490 // also determines whether a GC is permitted | |
| 491 // (at_safepoint == false) or not (at_safepoint == true) | |
| 492 // * do_dirtying : whether the method should dirty the allocated | |
| 493 // block before returning | |
| 494 // | |
| 495 // They all return either the address of the block, if they | |
| 496 // successfully manage to allocate it, or NULL. | |
| 342 | 497 |
| 1973 | 498 // It tries to satisfy an allocation request out of the current |
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499 // alloc region, which is passed as a parameter. It assumes that the |
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500 // caller has checked that the current alloc region is not NULL. |
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501 // Given that the caller has to check the current alloc region for |
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502 // at least NULL, it might as well pass it as the first parameter so |
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503 // that the method doesn't have to read it from the |
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504 // _cur_alloc_region field again. It is called from both |
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505 // attempt_allocation() and attempt_allocation_locked() and the |
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506 // with_heap_lock parameter indicates whether the caller was holding |
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507 // the heap lock when it called it or not. |
| 1973 | 508 inline HeapWord* allocate_from_cur_alloc_region(HeapRegion* cur_alloc_region, |
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509 size_t word_size, |
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510 bool with_heap_lock); |
| 1973 | 511 |
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512 // First-level of allocation slow path: it attempts to allocate out |
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513 // of the current alloc region in a lock-free manner using a CAS. If |
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514 // that fails it takes the Heap_lock and calls |
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515 // attempt_allocation_locked() for the second-level slow path. |
| 1973 | 516 inline HeapWord* attempt_allocation(size_t word_size); |
| 517 | |
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518 // Second-level of allocation slow path: while holding the Heap_lock |
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519 // it tries to allocate out of the current alloc region and, if that |
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520 // fails, tries to allocate out of a new current alloc region. |
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521 inline HeapWord* attempt_allocation_locked(size_t word_size); |
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522 |
| 1973 | 523 // It assumes that the current alloc region has been retired and |
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524 // tries to allocate a new one. If it's successful, it performs the |
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525 // allocation out of the new current alloc region and updates |
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526 // _cur_alloc_region. Normally, it would try to allocate a new |
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527 // region if the young gen is not full, unless can_expand is true in |
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528 // which case it would always try to allocate a new region. |
| 1973 | 529 HeapWord* replace_cur_alloc_region_and_allocate(size_t word_size, |
| 530 bool at_safepoint, | |
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531 bool do_dirtying, |
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532 bool can_expand); |
| 1973 | 533 |
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534 // Third-level of allocation slow path: when we are unable to |
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535 // allocate a new current alloc region to satisfy an allocation |
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536 // request (i.e., when attempt_allocation_locked() fails). It will |
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537 // try to do an evacuation pause, which might stall due to the GC |
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538 // locker, and retry the allocation attempt when appropriate. |
| 1973 | 539 HeapWord* attempt_allocation_slow(size_t word_size); |
| 540 | |
| 541 // The method that tries to satisfy a humongous allocation | |
| 542 // request. If it cannot satisfy it it will try to do an evacuation | |
| 543 // pause to perhaps reclaim enough space to be able to satisfy the | |
| 544 // allocation request afterwards. | |
| 545 HeapWord* attempt_allocation_humongous(size_t word_size, | |
| 546 bool at_safepoint); | |
| 547 | |
| 548 // It does the common work when we are retiring the current alloc region. | |
| 549 inline void retire_cur_alloc_region_common(HeapRegion* cur_alloc_region); | |
| 550 | |
| 551 // It retires the current alloc region, which is passed as a | |
| 552 // parameter (since, typically, the caller is already holding on to | |
| 553 // it). It sets _cur_alloc_region to NULL. | |
| 554 void retire_cur_alloc_region(HeapRegion* cur_alloc_region); | |
| 555 | |
| 556 // It attempts to do an allocation immediately before or after an | |
| 557 // evacuation pause and can only be called by the VM thread. It has | |
| 558 // slightly different assumptions that the ones before (i.e., | |
| 559 // assumes that the current alloc region has been retired). | |
| 560 HeapWord* attempt_allocation_at_safepoint(size_t word_size, | |
| 561 bool expect_null_cur_alloc_region); | |
| 562 | |
| 563 // It dirties the cards that cover the block so that so that the post | |
| 564 // write barrier never queues anything when updating objects on this | |
| 565 // block. It is assumed (and in fact we assert) that the block | |
| 566 // belongs to a young region. | |
| 567 inline void dirty_young_block(HeapWord* start, size_t word_size); | |
| 342 | 568 |
| 569 // Allocate blocks during garbage collection. Will ensure an | |
| 570 // allocation region, either by picking one or expanding the | |
| 571 // heap, and then allocate a block of the given size. The block | |
| 572 // may not be a humongous - it must fit into a single heap region. | |
| 573 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
| 574 | |
| 575 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, | |
| 576 HeapRegion* alloc_region, | |
| 577 bool par, | |
| 578 size_t word_size); | |
| 579 | |
| 580 // Ensure that no further allocations can happen in "r", bearing in mind | |
| 581 // that parallel threads might be attempting allocations. | |
| 582 void par_allocate_remaining_space(HeapRegion* r); | |
| 583 | |
| 545 | 584 // Retires an allocation region when it is full or at the end of a |
| 585 // GC pause. | |
| 586 void retire_alloc_region(HeapRegion* alloc_region, bool par); | |
| 587 | |
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588 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
| 1973 | 589 // inspection request and should collect the entire heap |
| 590 // - if clear_all_soft_refs is true, all soft references should be | |
| 591 // cleared during the GC | |
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592 // - if explicit_gc is false, word_size describes the allocation that |
| 1973 | 593 // the GC should attempt (at least) to satisfy |
| 594 // - it returns false if it is unable to do the collection due to the | |
| 595 // GC locker being active, true otherwise | |
| 596 bool do_collection(bool explicit_gc, | |
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597 bool clear_all_soft_refs, |
| 342 | 598 size_t word_size); |
| 599 | |
| 600 // Callback from VM_G1CollectFull operation. | |
| 601 // Perform a full collection. | |
| 602 void do_full_collection(bool clear_all_soft_refs); | |
| 603 | |
| 604 // Resize the heap if necessary after a full collection. If this is | |
| 605 // after a collect-for allocation, "word_size" is the allocation size, | |
| 606 // and will be considered part of the used portion of the heap. | |
| 607 void resize_if_necessary_after_full_collection(size_t word_size); | |
| 608 | |
| 609 // Callback from VM_G1CollectForAllocation operation. | |
| 610 // This function does everything necessary/possible to satisfy a | |
| 611 // failed allocation request (including collection, expansion, etc.) | |
| 1973 | 612 HeapWord* satisfy_failed_allocation(size_t word_size, bool* succeeded); |
| 342 | 613 |
| 614 // Attempting to expand the heap sufficiently | |
| 615 // to support an allocation of the given "word_size". If | |
| 616 // successful, perform the allocation and return the address of the | |
| 617 // allocated block, or else "NULL". | |
| 1973 | 618 HeapWord* expand_and_allocate(size_t word_size); |
| 342 | 619 |
| 620 public: | |
| 621 // Expand the garbage-first heap by at least the given size (in bytes!). | |
| 622 // (Rounds up to a HeapRegion boundary.) | |
| 623 virtual void expand(size_t expand_bytes); | |
| 624 | |
| 625 // Do anything common to GC's. | |
| 626 virtual void gc_prologue(bool full); | |
| 627 virtual void gc_epilogue(bool full); | |
| 628 | |
| 526 | 629 // We register a region with the fast "in collection set" test. We |
| 630 // simply set to true the array slot corresponding to this region. | |
| 631 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
| 632 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
| 633 assert(r->in_collection_set(), "invariant"); | |
| 634 int index = r->hrs_index(); | |
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635 assert(0 <= index && (size_t) index < _in_cset_fast_test_length, "invariant"); |
| 526 | 636 assert(!_in_cset_fast_test_base[index], "invariant"); |
| 637 _in_cset_fast_test_base[index] = true; | |
| 638 } | |
| 639 | |
| 640 // This is a fast test on whether a reference points into the | |
| 641 // collection set or not. It does not assume that the reference | |
| 642 // points into the heap; if it doesn't, it will return false. | |
| 643 bool in_cset_fast_test(oop obj) { | |
| 644 assert(_in_cset_fast_test != NULL, "sanity"); | |
| 645 if (_g1_committed.contains((HeapWord*) obj)) { | |
| 646 // no need to subtract the bottom of the heap from obj, | |
| 647 // _in_cset_fast_test is biased | |
| 648 size_t index = ((size_t) obj) >> HeapRegion::LogOfHRGrainBytes; | |
| 649 bool ret = _in_cset_fast_test[index]; | |
| 650 // let's make sure the result is consistent with what the slower | |
| 651 // test returns | |
| 652 assert( ret || !obj_in_cs(obj), "sanity"); | |
| 653 assert(!ret || obj_in_cs(obj), "sanity"); | |
| 654 return ret; | |
| 655 } else { | |
| 656 return false; | |
| 657 } | |
| 658 } | |
| 659 | |
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660 void clear_cset_fast_test() { |
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661 assert(_in_cset_fast_test_base != NULL, "sanity"); |
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662 memset(_in_cset_fast_test_base, false, |
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663 _in_cset_fast_test_length * sizeof(bool)); |
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664 } |
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665 |
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666 // This is called at the end of either a concurrent cycle or a Full |
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667 // GC to update the number of full collections completed. Those two |
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668 // can happen in a nested fashion, i.e., we start a concurrent |
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669 // cycle, a Full GC happens half-way through it which ends first, |
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670 // and then the cycle notices that a Full GC happened and ends |
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671 // too. The concurrent parameter is a boolean to help us do a bit |
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672 // tighter consistency checking in the method. If concurrent is |
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673 // false, the caller is the inner caller in the nesting (i.e., the |
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674 // Full GC). If concurrent is true, the caller is the outer caller |
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675 // in this nesting (i.e., the concurrent cycle). Further nesting is |
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676 // not currently supported. The end of the this call also notifies |
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677 // the FullGCCount_lock in case a Java thread is waiting for a full |
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678 // GC to happen (e.g., it called System.gc() with |
|
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679 // +ExplicitGCInvokesConcurrent). |
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680 void increment_full_collections_completed(bool concurrent); |
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681 |
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682 unsigned int full_collections_completed() { |
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683 return _full_collections_completed; |
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684 } |
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685 |
| 342 | 686 protected: |
| 687 | |
| 688 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
| 689 // (Rounds down to a HeapRegion boundary.) | |
| 690 virtual void shrink(size_t expand_bytes); | |
| 691 void shrink_helper(size_t expand_bytes); | |
| 692 | |
| 1709 | 693 #if TASKQUEUE_STATS |
| 694 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 695 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
| 696 void reset_taskqueue_stats(); | |
| 697 #endif // TASKQUEUE_STATS | |
| 698 | |
| 1973 | 699 // Schedule the VM operation that will do an evacuation pause to |
| 700 // satisfy an allocation request of word_size. *succeeded will | |
| 701 // return whether the VM operation was successful (it did do an | |
| 702 // evacuation pause) or not (another thread beat us to it or the GC | |
| 703 // locker was active). Given that we should not be holding the | |
| 704 // Heap_lock when we enter this method, we will pass the | |
| 705 // gc_count_before (i.e., total_collections()) as a parameter since | |
| 706 // it has to be read while holding the Heap_lock. Currently, both | |
| 707 // methods that call do_collection_pause() release the Heap_lock | |
| 708 // before the call, so it's easy to read gc_count_before just before. | |
| 709 HeapWord* do_collection_pause(size_t word_size, | |
| 710 unsigned int gc_count_before, | |
| 711 bool* succeeded); | |
| 342 | 712 |
| 713 // The guts of the incremental collection pause, executed by the vm | |
| 1973 | 714 // thread. It returns false if it is unable to do the collection due |
| 715 // to the GC locker being active, true otherwise | |
| 716 bool do_collection_pause_at_safepoint(double target_pause_time_ms); | |
| 342 | 717 |
| 718 // Actually do the work of evacuating the collection set. | |
| 1973 | 719 void evacuate_collection_set(); |
| 342 | 720 |
| 721 // The g1 remembered set of the heap. | |
| 722 G1RemSet* _g1_rem_set; | |
| 723 // And it's mod ref barrier set, used to track updates for the above. | |
| 724 ModRefBarrierSet* _mr_bs; | |
| 725 | |
|
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726 // A set of cards that cover the objects for which the Rsets should be updated |
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727 // concurrently after the collection. |
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728 DirtyCardQueueSet _dirty_card_queue_set; |
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729 |
| 342 | 730 // The Heap Region Rem Set Iterator. |
| 731 HeapRegionRemSetIterator** _rem_set_iterator; | |
| 732 | |
| 733 // The closure used to refine a single card. | |
| 734 RefineCardTableEntryClosure* _refine_cte_cl; | |
| 735 | |
| 736 // A function to check the consistency of dirty card logs. | |
| 737 void check_ct_logs_at_safepoint(); | |
| 738 | |
| 1705 | 739 // A DirtyCardQueueSet that is used to hold cards that contain |
| 740 // references into the current collection set. This is used to | |
| 741 // update the remembered sets of the regions in the collection | |
| 742 // set in the event of an evacuation failure. | |
| 743 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
| 744 | |
| 342 | 745 // After a collection pause, make the regions in the CS into free |
| 746 // regions. | |
| 747 void free_collection_set(HeapRegion* cs_head); | |
| 748 | |
|
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749 // Abandon the current collection set without recording policy |
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750 // statistics or updating free lists. |
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751 void abandon_collection_set(HeapRegion* cs_head); |
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752 |
| 342 | 753 // Applies "scan_non_heap_roots" to roots outside the heap, |
| 754 // "scan_rs" to roots inside the heap (having done "set_region" to | |
| 755 // indicate the region in which the root resides), and does "scan_perm" | |
| 756 // (setting the generation to the perm generation.) If "scan_rs" is | |
| 757 // NULL, then this step is skipped. The "worker_i" | |
| 758 // param is for use with parallel roots processing, and should be | |
| 759 // the "i" of the calling parallel worker thread's work(i) function. | |
| 760 // In the sequential case this param will be ignored. | |
| 761 void g1_process_strong_roots(bool collecting_perm_gen, | |
| 762 SharedHeap::ScanningOption so, | |
| 763 OopClosure* scan_non_heap_roots, | |
| 764 OopsInHeapRegionClosure* scan_rs, | |
| 765 OopsInGenClosure* scan_perm, | |
| 766 int worker_i); | |
| 767 | |
| 768 // Apply "blk" to all the weak roots of the system. These include | |
| 769 // JNI weak roots, the code cache, system dictionary, symbol table, | |
| 770 // string table, and referents of reachable weak refs. | |
| 771 void g1_process_weak_roots(OopClosure* root_closure, | |
| 772 OopClosure* non_root_closure); | |
| 773 | |
| 774 // Invoke "save_marks" on all heap regions. | |
| 775 void save_marks(); | |
| 776 | |
| 2152 | 777 // It frees a non-humongous region by initializing its contents and |
| 778 // adding it to the free list that's passed as a parameter (this is | |
| 779 // usually a local list which will be appended to the master free | |
| 780 // list later). The used bytes of freed regions are accumulated in | |
| 781 // pre_used. If par is true, the region's RSet will not be freed | |
| 782 // up. The assumption is that this will be done later. | |
| 783 void free_region(HeapRegion* hr, | |
| 784 size_t* pre_used, | |
| 785 FreeRegionList* free_list, | |
| 786 bool par); | |
| 342 | 787 |
| 2152 | 788 // It frees a humongous region by collapsing it into individual |
| 789 // regions and calling free_region() for each of them. The freed | |
| 790 // regions will be added to the free list that's passed as a parameter | |
| 791 // (this is usually a local list which will be appended to the | |
| 792 // master free list later). The used bytes of freed regions are | |
| 793 // accumulated in pre_used. If par is true, the region's RSet will | |
| 794 // not be freed up. The assumption is that this will be done later. | |
| 795 void free_humongous_region(HeapRegion* hr, | |
| 796 size_t* pre_used, | |
| 797 FreeRegionList* free_list, | |
| 798 HumongousRegionSet* humongous_proxy_set, | |
| 799 bool par); | |
| 342 | 800 |
| 801 // The concurrent marker (and the thread it runs in.) | |
| 802 ConcurrentMark* _cm; | |
| 803 ConcurrentMarkThread* _cmThread; | |
| 804 bool _mark_in_progress; | |
| 805 | |
| 806 // The concurrent refiner. | |
| 807 ConcurrentG1Refine* _cg1r; | |
| 808 | |
| 809 // The parallel task queues | |
| 810 RefToScanQueueSet *_task_queues; | |
| 811 | |
| 812 // True iff a evacuation has failed in the current collection. | |
| 813 bool _evacuation_failed; | |
| 814 | |
| 815 // Set the attribute indicating whether evacuation has failed in the | |
| 816 // current collection. | |
| 817 void set_evacuation_failed(bool b) { _evacuation_failed = b; } | |
| 818 | |
| 819 // Failed evacuations cause some logical from-space objects to have | |
| 820 // forwarding pointers to themselves. Reset them. | |
| 821 void remove_self_forwarding_pointers(); | |
| 822 | |
| 823 // When one is non-null, so is the other. Together, they each pair is | |
| 824 // an object with a preserved mark, and its mark value. | |
| 825 GrowableArray<oop>* _objs_with_preserved_marks; | |
| 826 GrowableArray<markOop>* _preserved_marks_of_objs; | |
| 827 | |
| 828 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
| 829 // word being overwritten with a self-forwarding-pointer. | |
| 830 void preserve_mark_if_necessary(oop obj, markOop m); | |
| 831 | |
| 832 // The stack of evac-failure objects left to be scanned. | |
| 833 GrowableArray<oop>* _evac_failure_scan_stack; | |
| 834 // The closure to apply to evac-failure objects. | |
| 835 | |
| 836 OopsInHeapRegionClosure* _evac_failure_closure; | |
| 837 // Set the field above. | |
| 838 void | |
| 839 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
| 840 _evac_failure_closure = evac_failure_closure; | |
| 841 } | |
| 842 | |
| 843 // Push "obj" on the scan stack. | |
| 844 void push_on_evac_failure_scan_stack(oop obj); | |
| 845 // Process scan stack entries until the stack is empty. | |
| 846 void drain_evac_failure_scan_stack(); | |
| 847 // True iff an invocation of "drain_scan_stack" is in progress; to | |
| 848 // prevent unnecessary recursion. | |
| 849 bool _drain_in_progress; | |
| 850 | |
| 851 // Do any necessary initialization for evacuation-failure handling. | |
| 852 // "cl" is the closure that will be used to process evac-failure | |
| 853 // objects. | |
| 854 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
| 855 // Do any necessary cleanup for evacuation-failure handling data | |
| 856 // structures. | |
| 857 void finalize_for_evac_failure(); | |
| 858 | |
| 859 // An attempt to evacuate "obj" has failed; take necessary steps. | |
| 860 oop handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, oop obj); | |
| 861 void handle_evacuation_failure_common(oop obj, markOop m); | |
| 862 | |
| 863 | |
| 864 // Ensure that the relevant gc_alloc regions are set. | |
| 865 void get_gc_alloc_regions(); | |
| 636 | 866 // We're done with GC alloc regions. We are going to tear down the |
| 867 // gc alloc list and remove the gc alloc tag from all the regions on | |
| 868 // that list. However, we will also retain the last (i.e., the one | |
| 869 // that is half-full) GC alloc region, per GCAllocPurpose, for | |
| 870 // possible reuse during the next collection, provided | |
| 871 // _retain_gc_alloc_region[] indicates that it should be the | |
| 872 // case. Said regions are kept in the _retained_gc_alloc_regions[] | |
| 873 // array. If the parameter totally is set, we will not retain any | |
| 874 // regions, irrespective of what _retain_gc_alloc_region[] | |
| 875 // indicates. | |
| 876 void release_gc_alloc_regions(bool totally); | |
| 877 #ifndef PRODUCT | |
| 878 // Useful for debugging. | |
| 879 void print_gc_alloc_regions(); | |
| 880 #endif // !PRODUCT | |
| 342 | 881 |
|
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882 // Instance of the concurrent mark is_alive closure for embedding |
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883 // into the reference processor as the is_alive_non_header. This |
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884 // prevents unnecessary additions to the discovered lists during |
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885 // concurrent discovery. |
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886 G1CMIsAliveClosure _is_alive_closure; |
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887 |
| 342 | 888 // ("Weak") Reference processing support |
| 889 ReferenceProcessor* _ref_processor; | |
| 890 | |
| 891 enum G1H_process_strong_roots_tasks { | |
| 892 G1H_PS_mark_stack_oops_do, | |
| 893 G1H_PS_refProcessor_oops_do, | |
| 894 // Leave this one last. | |
| 895 G1H_PS_NumElements | |
| 896 }; | |
| 897 | |
| 898 SubTasksDone* _process_strong_tasks; | |
| 899 | |
| 2152 | 900 volatile bool _free_regions_coming; |
| 342 | 901 |
| 902 public: | |
|
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903 |
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904 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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905 |
| 342 | 906 void set_refine_cte_cl_concurrency(bool concurrent); |
| 907 | |
| 1709 | 908 RefToScanQueue *task_queue(int i) const; |
| 342 | 909 |
|
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910 // A set of cards where updates happened during the GC |
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911 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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912 |
| 1705 | 913 // A DirtyCardQueueSet that is used to hold cards that contain |
| 914 // references into the current collection set. This is used to | |
| 915 // update the remembered sets of the regions in the collection | |
| 916 // set in the event of an evacuation failure. | |
| 917 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
| 918 { return _into_cset_dirty_card_queue_set; } | |
| 919 | |
| 342 | 920 // Create a G1CollectedHeap with the specified policy. |
| 921 // Must call the initialize method afterwards. | |
| 922 // May not return if something goes wrong. | |
| 923 G1CollectedHeap(G1CollectorPolicy* policy); | |
| 924 | |
| 925 // Initialize the G1CollectedHeap to have the initial and | |
| 926 // maximum sizes, permanent generation, and remembered and barrier sets | |
| 927 // specified by the policy object. | |
| 928 jint initialize(); | |
| 929 | |
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930 virtual void ref_processing_init(); |
| 342 | 931 |
| 932 void set_par_threads(int t) { | |
| 933 SharedHeap::set_par_threads(t); | |
|
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934 _process_strong_tasks->set_n_threads(t); |
| 342 | 935 } |
| 936 | |
| 937 virtual CollectedHeap::Name kind() const { | |
| 938 return CollectedHeap::G1CollectedHeap; | |
| 939 } | |
| 940 | |
| 941 // The current policy object for the collector. | |
| 942 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
| 943 | |
| 944 // Adaptive size policy. No such thing for g1. | |
| 945 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
| 946 | |
| 947 // The rem set and barrier set. | |
| 948 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
| 949 ModRefBarrierSet* mr_bs() const { return _mr_bs; } | |
| 950 | |
| 951 // The rem set iterator. | |
| 952 HeapRegionRemSetIterator* rem_set_iterator(int i) { | |
| 953 return _rem_set_iterator[i]; | |
| 954 } | |
| 955 | |
| 956 HeapRegionRemSetIterator* rem_set_iterator() { | |
| 957 return _rem_set_iterator[0]; | |
| 958 } | |
| 959 | |
| 960 unsigned get_gc_time_stamp() { | |
| 961 return _gc_time_stamp; | |
| 962 } | |
| 963 | |
| 964 void reset_gc_time_stamp() { | |
| 965 _gc_time_stamp = 0; | |
|
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966 OrderAccess::fence(); |
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967 } |
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968 |
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969 void increment_gc_time_stamp() { |
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970 ++_gc_time_stamp; |
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971 OrderAccess::fence(); |
| 342 | 972 } |
| 973 | |
| 1705 | 974 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 975 DirtyCardQueue* into_cset_dcq, | |
| 976 bool concurrent, int worker_i); | |
| 342 | 977 |
| 978 // The shared block offset table array. | |
| 979 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
| 980 | |
| 981 // Reference Processing accessor | |
| 982 ReferenceProcessor* ref_processor() { return _ref_processor; } | |
| 983 | |
| 984 // Reserved (g1 only; super method includes perm), capacity and the used | |
| 985 // portion in bytes. | |
|
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986 size_t g1_reserved_obj_bytes() const { return _g1_reserved.byte_size(); } |
| 342 | 987 virtual size_t capacity() const; |
| 988 virtual size_t used() const; | |
|
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989 // This should be called when we're not holding the heap lock. The |
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990 // result might be a bit inaccurate. |
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991 size_t used_unlocked() const; |
| 342 | 992 size_t recalculate_used() const; |
| 993 #ifndef PRODUCT | |
| 994 size_t recalculate_used_regions() const; | |
| 995 #endif // PRODUCT | |
| 996 | |
| 997 // These virtual functions do the actual allocation. | |
| 998 // Some heaps may offer a contiguous region for shared non-blocking | |
| 999 // allocation, via inlined code (by exporting the address of the top and | |
| 1000 // end fields defining the extent of the contiguous allocation region.) | |
| 1001 // But G1CollectedHeap doesn't yet support this. | |
| 1002 | |
| 1003 // Return an estimate of the maximum allocation that could be performed | |
| 1004 // without triggering any collection or expansion activity. In a | |
| 1005 // generational collector, for example, this is probably the largest | |
| 1006 // allocation that could be supported (without expansion) in the youngest | |
| 1007 // generation. It is "unsafe" because no locks are taken; the result | |
| 1008 // should be treated as an approximation, not a guarantee, for use in | |
| 1009 // heuristic resizing decisions. | |
| 1010 virtual size_t unsafe_max_alloc(); | |
| 1011 | |
| 1012 virtual bool is_maximal_no_gc() const { | |
| 1013 return _g1_storage.uncommitted_size() == 0; | |
| 1014 } | |
| 1015 | |
| 1016 // The total number of regions in the heap. | |
| 1017 size_t n_regions(); | |
| 1018 | |
| 1019 // The number of regions that are completely free. | |
| 1020 size_t max_regions(); | |
| 1021 | |
| 1022 // The number of regions that are completely free. | |
| 2152 | 1023 size_t free_regions() { |
| 1024 return _free_list.length(); | |
| 1025 } | |
| 342 | 1026 |
| 1027 // The number of regions that are not completely free. | |
| 1028 size_t used_regions() { return n_regions() - free_regions(); } | |
| 1029 | |
| 1030 // The number of regions available for "regular" expansion. | |
| 1031 size_t expansion_regions() { return _expansion_regions; } | |
| 1032 | |
| 2152 | 1033 // verify_region_sets() performs verification over the region |
| 1034 // lists. It will be compiled in the product code to be used when | |
| 1035 // necessary (i.e., during heap verification). | |
| 1036 void verify_region_sets(); | |
| 342 | 1037 |
| 2152 | 1038 // verify_region_sets_optional() is planted in the code for |
| 1039 // list verification in non-product builds (and it can be enabled in | |
| 1040 // product builds by definning HEAP_REGION_SET_FORCE_VERIFY to be 1). | |
| 1041 #if HEAP_REGION_SET_FORCE_VERIFY | |
| 1042 void verify_region_sets_optional() { | |
| 1043 verify_region_sets(); | |
| 1044 } | |
| 1045 #else // HEAP_REGION_SET_FORCE_VERIFY | |
| 1046 void verify_region_sets_optional() { } | |
| 1047 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
| 342 | 1048 |
| 2152 | 1049 #ifdef ASSERT |
| 1050 bool is_on_free_list(HeapRegion* hr) { | |
| 1051 return hr->containing_set() == &_free_list; | |
| 1052 } | |
| 342 | 1053 |
| 2152 | 1054 bool is_on_humongous_set(HeapRegion* hr) { |
| 1055 return hr->containing_set() == &_humongous_set; | |
| 1056 } | |
| 1057 #endif // ASSERT | |
| 342 | 1058 |
| 2152 | 1059 // Wrapper for the region list operations that can be called from |
| 1060 // methods outside this class. | |
| 342 | 1061 |
| 2152 | 1062 void secondary_free_list_add_as_tail(FreeRegionList* list) { |
| 1063 _secondary_free_list.add_as_tail(list); | |
| 1064 } | |
| 342 | 1065 |
| 2152 | 1066 void append_secondary_free_list() { |
| 1067 _free_list.add_as_tail(&_secondary_free_list); | |
| 1068 } | |
| 342 | 1069 |
| 2152 | 1070 void append_secondary_free_list_if_not_empty() { |
| 1071 if (!_secondary_free_list.is_empty()) { | |
| 1072 MutexLockerEx x(SecondaryFreeList_lock, Mutex::_no_safepoint_check_flag); | |
| 1073 append_secondary_free_list(); | |
| 1074 } | |
| 1075 } | |
| 342 | 1076 |
| 2152 | 1077 void set_free_regions_coming(); |
| 1078 void reset_free_regions_coming(); | |
| 1079 bool free_regions_coming() { return _free_regions_coming; } | |
| 1080 void wait_while_free_regions_coming(); | |
| 342 | 1081 |
| 1082 // Perform a collection of the heap; intended for use in implementing | |
| 1083 // "System.gc". This probably implies as full a collection as the | |
| 1084 // "CollectedHeap" supports. | |
| 1085 virtual void collect(GCCause::Cause cause); | |
| 1086 | |
| 1087 // The same as above but assume that the caller holds the Heap_lock. | |
| 1088 void collect_locked(GCCause::Cause cause); | |
| 1089 | |
| 1090 // This interface assumes that it's being called by the | |
| 1091 // vm thread. It collects the heap assuming that the | |
| 1092 // heap lock is already held and that we are executing in | |
| 1093 // the context of the vm thread. | |
| 1094 virtual void collect_as_vm_thread(GCCause::Cause cause); | |
| 1095 | |
| 1096 // True iff a evacuation has failed in the most-recent collection. | |
| 1097 bool evacuation_failed() { return _evacuation_failed; } | |
| 1098 | |
| 2152 | 1099 // It will free a region if it has allocated objects in it that are |
| 1100 // all dead. It calls either free_region() or | |
| 1101 // free_humongous_region() depending on the type of the region that | |
| 1102 // is passed to it. | |
| 2173 | 1103 void free_region_if_empty(HeapRegion* hr, |
| 1104 size_t* pre_used, | |
| 1105 FreeRegionList* free_list, | |
| 1106 HumongousRegionSet* humongous_proxy_set, | |
| 1107 HRRSCleanupTask* hrrs_cleanup_task, | |
| 1108 bool par); | |
| 342 | 1109 |
| 2152 | 1110 // It appends the free list to the master free list and updates the |
| 1111 // master humongous list according to the contents of the proxy | |
| 1112 // list. It also adjusts the total used bytes according to pre_used | |
| 1113 // (if par is true, it will do so by taking the ParGCRareEvent_lock). | |
| 1114 void update_sets_after_freeing_regions(size_t pre_used, | |
| 1115 FreeRegionList* free_list, | |
| 1116 HumongousRegionSet* humongous_proxy_set, | |
| 1117 bool par); | |
| 342 | 1118 |
| 1119 // Returns "TRUE" iff "p" points into the allocated area of the heap. | |
| 1120 virtual bool is_in(const void* p) const; | |
| 1121 | |
| 1122 // Return "TRUE" iff the given object address is within the collection | |
| 1123 // set. | |
| 1124 inline bool obj_in_cs(oop obj); | |
| 1125 | |
| 1126 // Return "TRUE" iff the given object address is in the reserved | |
| 1127 // region of g1 (excluding the permanent generation). | |
| 1128 bool is_in_g1_reserved(const void* p) const { | |
| 1129 return _g1_reserved.contains(p); | |
| 1130 } | |
| 1131 | |
| 1132 // Returns a MemRegion that corresponds to the space that has been | |
| 1133 // committed in the heap | |
| 1134 MemRegion g1_committed() { | |
| 1135 return _g1_committed; | |
| 1136 } | |
| 1137 | |
| 941 | 1138 NOT_PRODUCT(bool is_in_closed_subset(const void* p) const;) |
| 342 | 1139 |
| 1140 // Dirty card table entries covering a list of young regions. | |
| 1141 void dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list); | |
| 1142 | |
| 1143 // This resets the card table to all zeros. It is used after | |
| 1144 // a collection pause which used the card table to claim cards. | |
| 1145 void cleanUpCardTable(); | |
| 1146 | |
| 1147 // Iteration functions. | |
| 1148 | |
| 1149 // Iterate over all the ref-containing fields of all objects, calling | |
| 1150 // "cl.do_oop" on each. | |
| 678 | 1151 virtual void oop_iterate(OopClosure* cl) { |
| 1152 oop_iterate(cl, true); | |
| 1153 } | |
| 1154 void oop_iterate(OopClosure* cl, bool do_perm); | |
| 342 | 1155 |
| 1156 // Same as above, restricted to a memory region. | |
| 678 | 1157 virtual void oop_iterate(MemRegion mr, OopClosure* cl) { |
| 1158 oop_iterate(mr, cl, true); | |
| 1159 } | |
| 1160 void oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm); | |
| 342 | 1161 |
| 1162 // Iterate over all objects, calling "cl.do_object" on each. | |
| 678 | 1163 virtual void object_iterate(ObjectClosure* cl) { |
| 1164 object_iterate(cl, true); | |
| 1165 } | |
| 1166 virtual void safe_object_iterate(ObjectClosure* cl) { | |
| 1167 object_iterate(cl, true); | |
| 1168 } | |
| 1169 void object_iterate(ObjectClosure* cl, bool do_perm); | |
| 342 | 1170 |
| 1171 // Iterate over all objects allocated since the last collection, calling | |
| 1172 // "cl.do_object" on each. The heap must have been initialized properly | |
| 1173 // to support this function, or else this call will fail. | |
| 1174 virtual void object_iterate_since_last_GC(ObjectClosure* cl); | |
| 1175 | |
| 1176 // Iterate over all spaces in use in the heap, in ascending address order. | |
| 1177 virtual void space_iterate(SpaceClosure* cl); | |
| 1178 | |
| 1179 // Iterate over heap regions, in address order, terminating the | |
| 1180 // iteration early if the "doHeapRegion" method returns "true". | |
| 1181 void heap_region_iterate(HeapRegionClosure* blk); | |
| 1182 | |
| 1183 // Iterate over heap regions starting with r (or the first region if "r" | |
| 1184 // is NULL), in address order, terminating early if the "doHeapRegion" | |
| 1185 // method returns "true". | |
| 1186 void heap_region_iterate_from(HeapRegion* r, HeapRegionClosure* blk); | |
| 1187 | |
| 1188 // As above but starting from the region at index idx. | |
| 1189 void heap_region_iterate_from(int idx, HeapRegionClosure* blk); | |
| 1190 | |
| 1191 HeapRegion* region_at(size_t idx); | |
| 1192 | |
| 1193 // Divide the heap region sequence into "chunks" of some size (the number | |
| 1194 // of regions divided by the number of parallel threads times some | |
| 1195 // overpartition factor, currently 4). Assumes that this will be called | |
| 1196 // in parallel by ParallelGCThreads worker threads with discinct worker | |
| 1197 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
| 1198 // calls will use the same "claim_value", and that that claim value is | |
| 1199 // different from the claim_value of any heap region before the start of | |
| 1200 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
| 1201 // attempting to claim the first region in each chunk, and, if | |
| 1202 // successful, applying the closure to each region in the chunk (and | |
| 1203 // setting the claim value of the second and subsequent regions of the | |
| 1204 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
| 1205 // i.e., that a closure never attempt to abort a traversal. | |
| 1206 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
| 1207 int worker, | |
| 1208 jint claim_value); | |
| 1209 | |
| 390 | 1210 // It resets all the region claim values to the default. |
| 1211 void reset_heap_region_claim_values(); | |
| 1212 | |
| 355 | 1213 #ifdef ASSERT |
| 1214 bool check_heap_region_claim_values(jint claim_value); | |
| 1215 #endif // ASSERT | |
| 1216 | |
| 342 | 1217 // Iterate over the regions (if any) in the current collection set. |
| 1218 void collection_set_iterate(HeapRegionClosure* blk); | |
| 1219 | |
| 1220 // As above but starting from region r | |
| 1221 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
| 1222 | |
| 1223 // Returns the first (lowest address) compactible space in the heap. | |
| 1224 virtual CompactibleSpace* first_compactible_space(); | |
| 1225 | |
| 1226 // A CollectedHeap will contain some number of spaces. This finds the | |
| 1227 // space containing a given address, or else returns NULL. | |
| 1228 virtual Space* space_containing(const void* addr) const; | |
| 1229 | |
| 1230 // A G1CollectedHeap will contain some number of heap regions. This | |
| 1231 // finds the region containing a given address, or else returns NULL. | |
| 1232 HeapRegion* heap_region_containing(const void* addr) const; | |
| 1233 | |
| 1234 // Like the above, but requires "addr" to be in the heap (to avoid a | |
| 1235 // null-check), and unlike the above, may return an continuing humongous | |
| 1236 // region. | |
| 1237 HeapRegion* heap_region_containing_raw(const void* addr) const; | |
| 1238 | |
| 1239 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
| 1240 // each address in the (reserved) heap is a member of exactly | |
| 1241 // one block. The defining characteristic of a block is that it is | |
| 1242 // possible to find its size, and thus to progress forward to the next | |
| 1243 // block. (Blocks may be of different sizes.) Thus, blocks may | |
| 1244 // represent Java objects, or they might be free blocks in a | |
| 1245 // free-list-based heap (or subheap), as long as the two kinds are | |
| 1246 // distinguishable and the size of each is determinable. | |
| 1247 | |
| 1248 // Returns the address of the start of the "block" that contains the | |
| 1249 // address "addr". We say "blocks" instead of "object" since some heaps | |
| 1250 // may not pack objects densely; a chunk may either be an object or a | |
| 1251 // non-object. | |
| 1252 virtual HeapWord* block_start(const void* addr) const; | |
| 1253 | |
| 1254 // Requires "addr" to be the start of a chunk, and returns its size. | |
| 1255 // "addr + size" is required to be the start of a new chunk, or the end | |
| 1256 // of the active area of the heap. | |
| 1257 virtual size_t block_size(const HeapWord* addr) const; | |
| 1258 | |
| 1259 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
| 1260 // the block is an object. | |
| 1261 virtual bool block_is_obj(const HeapWord* addr) const; | |
| 1262 | |
| 1263 // Does this heap support heap inspection? (+PrintClassHistogram) | |
| 1264 virtual bool supports_heap_inspection() const { return true; } | |
| 1265 | |
| 1266 // Section on thread-local allocation buffers (TLABs) | |
| 1267 // See CollectedHeap for semantics. | |
| 1268 | |
| 1269 virtual bool supports_tlab_allocation() const; | |
| 1270 virtual size_t tlab_capacity(Thread* thr) const; | |
| 1271 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
| 1272 | |
| 1273 // Can a compiler initialize a new object without store barriers? | |
| 1274 // This permission only extends from the creation of a new object | |
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1275 // via a TLAB up to the first subsequent safepoint. If such permission |
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1276 // is granted for this heap type, the compiler promises to call |
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1277 // defer_store_barrier() below on any slow path allocation of |
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1278 // a new object for which such initializing store barriers will |
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1279 // have been elided. G1, like CMS, allows this, but should be |
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1280 // ready to provide a compensating write barrier as necessary |
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1281 // if that storage came out of a non-young region. The efficiency |
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1282 // of this implementation depends crucially on being able to |
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1283 // answer very efficiently in constant time whether a piece of |
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1284 // storage in the heap comes from a young region or not. |
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1285 // See ReduceInitialCardMarks. |
| 342 | 1286 virtual bool can_elide_tlab_store_barriers() const { |
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1287 // 6920090: Temporarily disabled, because of lingering |
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1288 // instabilities related to RICM with G1. In the |
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1289 // interim, the option ReduceInitialCardMarksForG1 |
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1290 // below is left solely as a debugging device at least |
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1291 // until 6920109 fixes the instabilities. |
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1292 return ReduceInitialCardMarksForG1; |
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1293 } |
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1294 |
| 1166 | 1295 virtual bool card_mark_must_follow_store() const { |
| 1296 return true; | |
| 1297 } | |
| 1298 | |
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1299 bool is_in_young(oop obj) { |
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1300 HeapRegion* hr = heap_region_containing(obj); |
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1301 return hr != NULL && hr->is_young(); |
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1302 } |
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1303 |
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1304 // We don't need barriers for initializing stores to objects |
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1305 // in the young gen: for the SATB pre-barrier, there is no |
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1306 // pre-value that needs to be remembered; for the remembered-set |
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1307 // update logging post-barrier, we don't maintain remembered set |
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1308 // information for young gen objects. Note that non-generational |
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1309 // G1 does not have any "young" objects, should not elide |
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1310 // the rs logging barrier and so should always answer false below. |
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1311 // However, non-generational G1 (-XX:-G1Gen) appears to have |
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1312 // bit-rotted so was not tested below. |
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1313 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
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1314 // Re 6920090, 6920109 above. |
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1315 assert(ReduceInitialCardMarksForG1, "Else cannot be here"); |
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1316 assert(G1Gen || !is_in_young(new_obj), |
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1317 "Non-generational G1 should never return true below"); |
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1318 return is_in_young(new_obj); |
| 342 | 1319 } |
| 1320 | |
| 1321 // Can a compiler elide a store barrier when it writes | |
| 1322 // a permanent oop into the heap? Applies when the compiler | |
| 1323 // is storing x to the heap, where x->is_perm() is true. | |
| 1324 virtual bool can_elide_permanent_oop_store_barriers() const { | |
| 1325 // At least until perm gen collection is also G1-ified, at | |
| 1326 // which point this should return false. | |
| 1327 return true; | |
| 1328 } | |
| 1329 | |
| 1330 // The boundary between a "large" and "small" array of primitives, in | |
| 1331 // words. | |
| 1332 virtual size_t large_typearray_limit(); | |
| 1333 | |
| 1334 // Returns "true" iff the given word_size is "very large". | |
| 1335 static bool isHumongous(size_t word_size) { | |
|
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1336 // Note this has to be strictly greater-than as the TLABs |
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1337 // are capped at the humongous thresold and we want to |
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1338 // ensure that we don't try to allocate a TLAB as |
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1339 // humongous and that we don't allocate a humongous |
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1340 // object in a TLAB. |
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1341 return word_size > _humongous_object_threshold_in_words; |
| 342 | 1342 } |
| 1343 | |
| 1344 // Update mod union table with the set of dirty cards. | |
| 1345 void updateModUnion(); | |
| 1346 | |
| 1347 // Set the mod union bits corresponding to the given memRegion. Note | |
| 1348 // that this is always a safe operation, since it doesn't clear any | |
| 1349 // bits. | |
| 1350 void markModUnionRange(MemRegion mr); | |
| 1351 | |
| 1352 // Records the fact that a marking phase is no longer in progress. | |
| 1353 void set_marking_complete() { | |
| 1354 _mark_in_progress = false; | |
| 1355 } | |
| 1356 void set_marking_started() { | |
| 1357 _mark_in_progress = true; | |
| 1358 } | |
| 1359 bool mark_in_progress() { | |
| 1360 return _mark_in_progress; | |
| 1361 } | |
| 1362 | |
| 1363 // Print the maximum heap capacity. | |
| 1364 virtual size_t max_capacity() const; | |
| 1365 | |
| 1366 virtual jlong millis_since_last_gc(); | |
| 1367 | |
| 1368 // Perform any cleanup actions necessary before allowing a verification. | |
| 1369 virtual void prepare_for_verify(); | |
| 1370 | |
| 1371 // Perform verification. | |
| 811 | 1372 |
| 1373 // use_prev_marking == true -> use "prev" marking information, | |
| 1374 // use_prev_marking == false -> use "next" marking information | |
| 1375 // NOTE: Only the "prev" marking information is guaranteed to be | |
| 1376 // consistent most of the time, so most calls to this should use | |
| 1377 // use_prev_marking == true. Currently, there is only one case where | |
| 1378 // this is called with use_prev_marking == false, which is to verify | |
| 1379 // the "next" marking information at the end of remark. | |
| 1380 void verify(bool allow_dirty, bool silent, bool use_prev_marking); | |
| 1381 | |
| 1382 // Override; it uses the "prev" marking information | |
| 342 | 1383 virtual void verify(bool allow_dirty, bool silent); |
|
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1384 // Default behavior by calling print(tty); |
| 342 | 1385 virtual void print() const; |
|
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1386 // This calls print_on(st, PrintHeapAtGCExtended). |
| 342 | 1387 virtual void print_on(outputStream* st) const; |
|
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1388 // If extended is true, it will print out information for all |
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1389 // regions in the heap by calling print_on_extended(st). |
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1390 virtual void print_on(outputStream* st, bool extended) const; |
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1391 virtual void print_on_extended(outputStream* st) const; |
| 342 | 1392 |
| 1393 virtual void print_gc_threads_on(outputStream* st) const; | |
| 1394 virtual void gc_threads_do(ThreadClosure* tc) const; | |
| 1395 | |
| 1396 // Override | |
| 1397 void print_tracing_info() const; | |
| 1398 | |
| 1399 // If "addr" is a pointer into the (reserved?) heap, returns a positive | |
| 1400 // number indicating the "arena" within the heap in which "addr" falls. | |
| 1401 // Or else returns 0. | |
| 1402 virtual int addr_to_arena_id(void* addr) const; | |
| 1403 | |
| 1404 // Convenience function to be used in situations where the heap type can be | |
| 1405 // asserted to be this type. | |
| 1406 static G1CollectedHeap* heap(); | |
| 1407 | |
| 1408 void empty_young_list(); | |
| 1409 | |
| 1410 void set_region_short_lived_locked(HeapRegion* hr); | |
| 1411 // add appropriate methods for any other surv rate groups | |
| 1412 | |
|
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1413 YoungList* young_list() { return _young_list; } |
| 342 | 1414 |
| 1415 // debugging | |
| 1416 bool check_young_list_well_formed() { | |
| 1417 return _young_list->check_list_well_formed(); | |
| 1418 } | |
|
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1419 |
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1420 bool check_young_list_empty(bool check_heap, |
| 342 | 1421 bool check_sample = true); |
| 1422 | |
| 1423 // *** Stuff related to concurrent marking. It's not clear to me that so | |
| 1424 // many of these need to be public. | |
| 1425 | |
| 1426 // The functions below are helper functions that a subclass of | |
| 1427 // "CollectedHeap" can use in the implementation of its virtual | |
| 1428 // functions. | |
| 1429 // This performs a concurrent marking of the live objects in a | |
| 1430 // bitmap off to the side. | |
| 1431 void doConcurrentMark(); | |
| 1432 | |
| 1433 // This is called from the marksweep collector which then does | |
| 1434 // a concurrent mark and verifies that the results agree with | |
| 1435 // the stop the world marking. | |
| 1436 void checkConcurrentMark(); | |
| 1437 void do_sync_mark(); | |
| 1438 | |
| 1439 bool isMarkedPrev(oop obj) const; | |
| 1440 bool isMarkedNext(oop obj) const; | |
| 1441 | |
| 811 | 1442 // use_prev_marking == true -> use "prev" marking information, |
| 1443 // use_prev_marking == false -> use "next" marking information | |
| 1444 bool is_obj_dead_cond(const oop obj, | |
| 1445 const HeapRegion* hr, | |
| 1446 const bool use_prev_marking) const { | |
| 1447 if (use_prev_marking) { | |
| 1448 return is_obj_dead(obj, hr); | |
| 1449 } else { | |
| 1450 return is_obj_ill(obj, hr); | |
| 1451 } | |
| 1452 } | |
| 1453 | |
| 342 | 1454 // Determine if an object is dead, given the object and also |
| 1455 // the region to which the object belongs. An object is dead | |
| 1456 // iff a) it was not allocated since the last mark and b) it | |
| 1457 // is not marked. | |
| 1458 | |
| 1459 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
| 1460 return | |
| 1461 !hr->obj_allocated_since_prev_marking(obj) && | |
| 1462 !isMarkedPrev(obj); | |
| 1463 } | |
| 1464 | |
| 1465 // This is used when copying an object to survivor space. | |
| 1466 // If the object is marked live, then we mark the copy live. | |
| 1467 // If the object is allocated since the start of this mark | |
| 1468 // cycle, then we mark the copy live. | |
| 1469 // If the object has been around since the previous mark | |
| 1470 // phase, and hasn't been marked yet during this phase, | |
| 1471 // then we don't mark it, we just wait for the | |
| 1472 // current marking cycle to get to it. | |
| 1473 | |
| 1474 // This function returns true when an object has been | |
| 1475 // around since the previous marking and hasn't yet | |
| 1476 // been marked during this marking. | |
| 1477 | |
| 1478 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
| 1479 return | |
| 1480 !hr->obj_allocated_since_next_marking(obj) && | |
| 1481 !isMarkedNext(obj); | |
| 1482 } | |
| 1483 | |
| 1484 // Determine if an object is dead, given only the object itself. | |
| 1485 // This will find the region to which the object belongs and | |
| 1486 // then call the region version of the same function. | |
| 1487 | |
| 1488 // Added if it is in permanent gen it isn't dead. | |
| 1489 // Added if it is NULL it isn't dead. | |
| 1490 | |
| 811 | 1491 // use_prev_marking == true -> use "prev" marking information, |
| 1492 // use_prev_marking == false -> use "next" marking information | |
| 1493 bool is_obj_dead_cond(const oop obj, | |
| 1494 const bool use_prev_marking) { | |
| 1495 if (use_prev_marking) { | |
| 1496 return is_obj_dead(obj); | |
| 1497 } else { | |
| 1498 return is_obj_ill(obj); | |
| 1499 } | |
| 1500 } | |
| 1501 | |
| 1502 bool is_obj_dead(const oop obj) { | |
| 1503 const HeapRegion* hr = heap_region_containing(obj); | |
| 342 | 1504 if (hr == NULL) { |
| 1505 if (Universe::heap()->is_in_permanent(obj)) | |
| 1506 return false; | |
| 1507 else if (obj == NULL) return false; | |
| 1508 else return true; | |
| 1509 } | |
| 1510 else return is_obj_dead(obj, hr); | |
| 1511 } | |
| 1512 | |
| 811 | 1513 bool is_obj_ill(const oop obj) { |
| 1514 const HeapRegion* hr = heap_region_containing(obj); | |
| 342 | 1515 if (hr == NULL) { |
| 1516 if (Universe::heap()->is_in_permanent(obj)) | |
| 1517 return false; | |
| 1518 else if (obj == NULL) return false; | |
| 1519 else return true; | |
| 1520 } | |
| 1521 else return is_obj_ill(obj, hr); | |
| 1522 } | |
| 1523 | |
| 1524 // The following is just to alert the verification code | |
| 1525 // that a full collection has occurred and that the | |
| 1526 // remembered sets are no longer up to date. | |
| 1527 bool _full_collection; | |
| 1528 void set_full_collection() { _full_collection = true;} | |
| 1529 void clear_full_collection() {_full_collection = false;} | |
| 1530 bool full_collection() {return _full_collection;} | |
| 1531 | |
| 1532 ConcurrentMark* concurrent_mark() const { return _cm; } | |
| 1533 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
| 1534 | |
|
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1535 // The dirty cards region list is used to record a subset of regions |
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1536 // whose cards need clearing. The list if populated during the |
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1537 // remembered set scanning and drained during the card table |
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1538 // cleanup. Although the methods are reentrant, population/draining |
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1539 // phases must not overlap. For synchronization purposes the last |
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1540 // element on the list points to itself. |
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1541 HeapRegion* _dirty_cards_region_list; |
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1542 void push_dirty_cards_region(HeapRegion* hr); |
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1543 HeapRegion* pop_dirty_cards_region(); |
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1544 |
| 342 | 1545 public: |
| 1546 void stop_conc_gc_threads(); | |
| 1547 | |
| 1548 // <NEW PREDICTION> | |
| 1549 | |
| 1550 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
| 1551 void check_if_region_is_too_expensive(double predicted_time_ms); | |
| 1552 size_t pending_card_num(); | |
| 1553 size_t max_pending_card_num(); | |
| 1554 size_t cards_scanned(); | |
| 1555 | |
| 1556 // </NEW PREDICTION> | |
| 1557 | |
| 1558 protected: | |
| 1559 size_t _max_heap_capacity; | |
| 1560 }; | |
| 1561 | |
|
845
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1562 #define use_local_bitmaps 1 |
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1563 #define verify_local_bitmaps 0 |
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1564 #define oop_buffer_length 256 |
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1565 |
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1566 #ifndef PRODUCT |
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1567 class GCLabBitMap; |
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1568 class GCLabBitMapClosure: public BitMapClosure { |
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1569 private: |
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|
1570 ConcurrentMark* _cm; |
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1571 GCLabBitMap* _bitmap; |
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1572 |
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1573 public: |
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1574 GCLabBitMapClosure(ConcurrentMark* cm, |
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1575 GCLabBitMap* bitmap) { |
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1576 _cm = cm; |
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1577 _bitmap = bitmap; |
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1578 } |
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1579 |
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1580 virtual bool do_bit(size_t offset); |
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1581 }; |
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1582 #endif // !PRODUCT |
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1583 |
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1584 class GCLabBitMap: public BitMap { |
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1585 private: |
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1586 ConcurrentMark* _cm; |
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1587 |
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1588 int _shifter; |
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1589 size_t _bitmap_word_covers_words; |
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1590 |
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1591 // beginning of the heap |
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1592 HeapWord* _heap_start; |
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1593 |
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1594 // this is the actual start of the GCLab |
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1595 HeapWord* _real_start_word; |
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1596 |
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1597 // this is the actual end of the GCLab |
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1598 HeapWord* _real_end_word; |
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1599 |
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1600 // this is the first word, possibly located before the actual start |
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1601 // of the GCLab, that corresponds to the first bit of the bitmap |
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1602 HeapWord* _start_word; |
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1603 |
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1604 // size of a GCLab in words |
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1605 size_t _gclab_word_size; |
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1606 |
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|
1607 static int shifter() { |
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|
1608 return MinObjAlignment - 1; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1609 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1610 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1611 // how many heap words does a single bitmap word corresponds to? |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1612 static size_t bitmap_word_covers_words() { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1613 return BitsPerWord << shifter(); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1614 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1615 |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1616 size_t gclab_word_size() const { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1617 return _gclab_word_size; |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1618 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1619 |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1620 // Calculates actual GCLab size in words |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1621 size_t gclab_real_word_size() const { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1622 return bitmap_size_in_bits(pointer_delta(_real_end_word, _start_word)) |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1623 / BitsPerWord; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1624 } |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1625 |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1626 static size_t bitmap_size_in_bits(size_t gclab_word_size) { |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1627 size_t bits_in_bitmap = gclab_word_size >> shifter(); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1628 // We are going to ensure that the beginning of a word in this |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1629 // bitmap also corresponds to the beginning of a word in the |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1630 // global marking bitmap. To handle the case where a GCLab |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1631 // starts from the middle of the bitmap, we need to add enough |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1632 // space (i.e. up to a bitmap word) to ensure that we have |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1633 // enough bits in the bitmap. |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1634 return bits_in_bitmap + BitsPerWord - 1; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1635 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1636 public: |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1637 GCLabBitMap(HeapWord* heap_start, size_t gclab_word_size) |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1638 : BitMap(bitmap_size_in_bits(gclab_word_size)), |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1639 _cm(G1CollectedHeap::heap()->concurrent_mark()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1640 _shifter(shifter()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1641 _bitmap_word_covers_words(bitmap_word_covers_words()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1642 _heap_start(heap_start), |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1643 _gclab_word_size(gclab_word_size), |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1644 _real_start_word(NULL), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1645 _real_end_word(NULL), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1646 _start_word(NULL) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1647 { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1648 guarantee( size_in_words() >= bitmap_size_in_words(), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1649 "just making sure"); |
|
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 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1652 inline unsigned heapWordToOffset(HeapWord* addr) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1653 unsigned offset = (unsigned) pointer_delta(addr, _start_word) >> _shifter; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1654 assert(offset < size(), "offset should be within bounds"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1655 return offset; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1656 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1657 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1658 inline HeapWord* offsetToHeapWord(size_t offset) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1659 HeapWord* addr = _start_word + (offset << _shifter); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1660 assert(_real_start_word <= addr && addr < _real_end_word, "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1661 return addr; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1662 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1663 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1664 bool fields_well_formed() { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1665 bool ret1 = (_real_start_word == NULL) && |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1666 (_real_end_word == NULL) && |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1667 (_start_word == NULL); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1668 if (ret1) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1669 return true; |
|
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 bool ret2 = _real_start_word >= _start_word && |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1672 _start_word < _real_end_word && |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1673 (_real_start_word + _gclab_word_size) == _real_end_word && |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1674 (_start_word + _gclab_word_size + _bitmap_word_covers_words) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1675 > _real_end_word; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1676 return ret2; |
|
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 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1679 inline bool mark(HeapWord* addr) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1680 guarantee(use_local_bitmaps, "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1681 assert(fields_well_formed(), "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1682 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1683 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
|
1684 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
|
1685 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1686 // first mark it on the bitmap |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1687 at_put(heapWordToOffset(addr), true); |
|
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 return true; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1690 } else { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1691 return false; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1692 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1693 } |
|
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 inline bool isMarked(HeapWord* addr) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1696 guarantee(use_local_bitmaps, "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1697 assert(fields_well_formed(), "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1698 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1699 return at(heapWordToOffset(addr)); |
|
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 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1702 void set_buffer(HeapWord* start) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1703 guarantee(use_local_bitmaps, "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1704 clear(); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1705 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1706 assert(start != NULL, "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1707 _real_start_word = start; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1708 _real_end_word = start + _gclab_word_size; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1709 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1710 size_t diff = |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1711 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
|
1712 _start_word = start - diff; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1713 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1714 assert(fields_well_formed(), "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1715 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1716 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1717 #ifndef PRODUCT |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1718 void verify() { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1719 // verify that the marks have been propagated |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1720 GCLabBitMapClosure cl(_cm, this); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1721 iterate(&cl); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1722 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1723 #endif // PRODUCT |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1724 |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1725 void retire() { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1726 guarantee(use_local_bitmaps, "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1727 assert(fields_well_formed(), "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1728 |
|
df6caf649ff7
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1729 if (_start_word != NULL) { |
|
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1730 CMBitMap* mark_bitmap = _cm->nextMarkBitMap(); |
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1731 |
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1732 // this means that the bitmap was set up for the GCLab |
|
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1733 assert(_real_start_word != NULL && _real_end_word != NULL, "invariant"); |
|
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1734 |
|
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1735 mark_bitmap->mostly_disjoint_range_union(this, |
|
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1736 0, // always start from the start of the bitmap |
|
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1737 _start_word, |
|
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1738 gclab_real_word_size()); |
|
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1739 _cm->grayRegionIfNecessary(MemRegion(_real_start_word, _real_end_word)); |
|
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1740 |
|
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|
1741 #ifndef PRODUCT |
|
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1742 if (use_local_bitmaps && verify_local_bitmaps) |
|
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|
1743 verify(); |
|
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|
1744 #endif // PRODUCT |
|
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1745 } else { |
|
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1746 assert(_real_start_word == NULL && _real_end_word == NULL, "invariant"); |
|
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1747 } |
|
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1748 } |
|
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1749 |
|
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|
1750 size_t bitmap_size_in_words() const { |
|
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1751 return (bitmap_size_in_bits(gclab_word_size()) + BitsPerWord - 1) / BitsPerWord; |
|
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1752 } |
|
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1753 |
|
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1754 }; |
|
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1755 |
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1756 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
|
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1757 private: |
|
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1758 bool _retired; |
|
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|
1759 bool _during_marking; |
|
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1760 GCLabBitMap _bitmap; |
|
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1761 |
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1762 public: |
|
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1763 G1ParGCAllocBuffer(size_t gclab_word_size) : |
|
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1764 ParGCAllocBuffer(gclab_word_size), |
|
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1765 _during_marking(G1CollectedHeap::heap()->mark_in_progress()), |
|
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1766 _bitmap(G1CollectedHeap::heap()->reserved_region().start(), gclab_word_size), |
|
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1767 _retired(false) |
|
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1768 { } |
|
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1769 |
|
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|
1770 inline bool mark(HeapWord* addr) { |
|
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1771 guarantee(use_local_bitmaps, "invariant"); |
|
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1772 assert(_during_marking, "invariant"); |
|
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1773 return _bitmap.mark(addr); |
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1774 } |
|
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1775 |
|
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1776 inline void set_buf(HeapWord* buf) { |
|
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1777 if (use_local_bitmaps && _during_marking) |
|
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1778 _bitmap.set_buffer(buf); |
|
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|
1779 ParGCAllocBuffer::set_buf(buf); |
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1780 _retired = false; |
|
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1781 } |
|
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1782 |
|
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1783 inline void retire(bool end_of_gc, bool retain) { |
|
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1784 if (_retired) |
|
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|
1785 return; |
|
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|
1786 if (use_local_bitmaps && _during_marking) { |
|
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|
1787 _bitmap.retire(); |
|
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|
1788 } |
|
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|
1789 ParGCAllocBuffer::retire(end_of_gc, retain); |
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|
1790 _retired = true; |
|
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|
1791 } |
|
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|
1792 }; |
|
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|
1793 |
|
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1794 class G1ParScanThreadState : public StackObj { |
|
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1795 protected: |
|
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1796 G1CollectedHeap* _g1h; |
|
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|
1797 RefToScanQueue* _refs; |
|
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|
1798 DirtyCardQueue _dcq; |
|
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|
1799 CardTableModRefBS* _ct_bs; |
|
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1800 G1RemSet* _g1_rem; |
|
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1801 |
|
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|
1802 G1ParGCAllocBuffer _surviving_alloc_buffer; |
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1803 G1ParGCAllocBuffer _tenured_alloc_buffer; |
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1804 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount]; |
|
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|
1805 ageTable _age_table; |
|
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1806 |
|
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1807 size_t _alloc_buffer_waste; |
|
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|
1808 size_t _undo_waste; |
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1809 |
|
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1810 OopsInHeapRegionClosure* _evac_failure_cl; |
|
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|
1811 G1ParScanHeapEvacClosure* _evac_cl; |
|
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1812 G1ParScanPartialArrayClosure* _partial_scan_cl; |
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1813 |
|
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|
1814 int _hash_seed; |
|
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|
1815 int _queue_num; |
|
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1816 |
| 1611 | 1817 size_t _term_attempts; |
|
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1818 |
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1819 double _start; |
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|
1820 double _start_strong_roots; |
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|
1821 double _strong_roots_time; |
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|
1822 double _start_term; |
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|
1823 double _term_time; |
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1824 |
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1825 // Map from young-age-index (0 == not young, 1 is youngest) to |
|
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1826 // surviving words. base is what we get back from the malloc call |
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1827 size_t* _surviving_young_words_base; |
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1828 // this points into the array, as we use the first few entries for padding |
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|
1829 size_t* _surviving_young_words; |
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1830 |
| 1709 | 1831 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
|
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1832 |
|
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1833 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
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1834 |
|
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|
1835 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
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1836 |
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|
1837 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
|
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|
1838 CardTableModRefBS* ctbs() { return _ct_bs; } |
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1839 |
|
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1840 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
|
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1841 if (!from->is_survivor()) { |
|
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|
1842 _g1_rem->par_write_ref(from, p, tid); |
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|
1843 } |
|
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|
1844 } |
|
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1845 |
|
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|
1846 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
|
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|
1847 // If the new value of the field points to the same region or |
|
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|
1848 // is the to-space, we don't need to include it in the Rset updates. |
|
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1849 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
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1850 size_t card_index = ctbs()->index_for(p); |
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1851 // If the card hasn't been added to the buffer, do it. |
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1852 if (ctbs()->mark_card_deferred(card_index)) { |
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1853 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
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1854 } |
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1855 } |
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1856 } |
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1857 |
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1858 public: |
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1859 G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num); |
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1860 |
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1861 ~G1ParScanThreadState() { |
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1862 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base); |
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1863 } |
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1864 |
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1865 RefToScanQueue* refs() { return _refs; } |
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1866 ageTable* age_table() { return &_age_table; } |
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1867 |
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1868 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
|
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1869 return _alloc_buffers[purpose]; |
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1870 } |
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1871 |
| 1709 | 1872 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
| 1873 size_t undo_waste() const { return _undo_waste; } | |
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1874 |
|
1862
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1875 #ifdef ASSERT |
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1876 bool verify_ref(narrowOop* ref) const; |
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1877 bool verify_ref(oop* ref) const; |
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1878 bool verify_task(StarTask ref) const; |
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1879 #endif // ASSERT |
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1880 |
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1881 template <class T> void push_on_queue(T* ref) { |
|
1862
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1882 assert(verify_ref(ref), "sanity"); |
| 1709 | 1883 refs()->push(ref); |
|
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1884 } |
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1885 |
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1886 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
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1887 if (G1DeferredRSUpdate) { |
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1888 deferred_rs_update(from, p, tid); |
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1889 } else { |
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1890 immediate_rs_update(from, p, tid); |
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1891 } |
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1892 } |
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1893 |
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1894 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
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1895 |
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1896 HeapWord* obj = NULL; |
|
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1897 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
|
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1898 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
|
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1899 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
|
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1900 assert(gclab_word_size == alloc_buf->word_sz(), |
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1901 "dynamic resizing is not supported"); |
|
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1902 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
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1903 alloc_buf->retire(false, false); |
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1904 |
|
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1905 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
|
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1906 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
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1907 // Otherwise. |
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1908 alloc_buf->set_buf(buf); |
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1909 |
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1910 obj = alloc_buf->allocate(word_sz); |
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1911 assert(obj != NULL, "buffer was definitely big enough..."); |
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1912 } else { |
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1913 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
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1914 } |
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1915 return obj; |
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1916 } |
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1917 |
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1918 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
|
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1919 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
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1920 if (obj != NULL) return obj; |
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1921 return allocate_slow(purpose, word_sz); |
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1922 } |
|
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1923 |
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1924 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
|
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1925 if (alloc_buffer(purpose)->contains(obj)) { |
|
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1926 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
|
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1927 "should contain whole object"); |
|
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1928 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
|
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1929 } else { |
|
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1930 CollectedHeap::fill_with_object(obj, word_sz); |
|
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1931 add_to_undo_waste(word_sz); |
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1932 } |
|
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1933 } |
|
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1934 |
|
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1935 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
|
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1936 _evac_failure_cl = evac_failure_cl; |
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1937 } |
|
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1938 OopsInHeapRegionClosure* evac_failure_closure() { |
|
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1939 return _evac_failure_cl; |
|
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1940 } |
|
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1941 |
|
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1942 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
|
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1943 _evac_cl = evac_cl; |
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1944 } |
|
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1945 |
|
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1946 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
|
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1947 _partial_scan_cl = partial_scan_cl; |
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1948 } |
|
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1949 |
|
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1950 int* hash_seed() { return &_hash_seed; } |
|
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1951 int queue_num() { return _queue_num; } |
|
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1952 |
| 1709 | 1953 size_t term_attempts() const { return _term_attempts; } |
| 1611 | 1954 void note_term_attempt() { _term_attempts++; } |
|
845
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1955 |
|
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1956 void start_strong_roots() { |
|
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1957 _start_strong_roots = os::elapsedTime(); |
|
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1958 } |
|
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1959 void end_strong_roots() { |
|
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1960 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
|
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1961 } |
| 1709 | 1962 double strong_roots_time() const { return _strong_roots_time; } |
|
845
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1963 |
|
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|
1964 void start_term_time() { |
|
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|
1965 note_term_attempt(); |
|
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|
1966 _start_term = os::elapsedTime(); |
|
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|
1967 } |
|
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|
1968 void end_term_time() { |
|
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1969 _term_time += (os::elapsedTime() - _start_term); |
|
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|
1970 } |
| 1709 | 1971 double term_time() const { return _term_time; } |
|
845
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|
1972 |
| 1709 | 1973 double elapsed_time() const { |
|
845
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|
1974 return os::elapsedTime() - _start; |
|
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1975 } |
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1976 |
| 1709 | 1977 static void |
| 1978 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 1979 void | |
| 1980 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
| 1981 | |
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1982 size_t* surviving_young_words() { |
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1983 // We add on to hide entry 0 which accumulates surviving words for |
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1984 // age -1 regions (i.e. non-young ones) |
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1985 return _surviving_young_words; |
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1986 } |
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1987 |
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1988 void retire_alloc_buffers() { |
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1989 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
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1990 size_t waste = _alloc_buffers[ap]->words_remaining(); |
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1991 add_to_alloc_buffer_waste(waste); |
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1992 _alloc_buffers[ap]->retire(true, false); |
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1993 } |
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1994 } |
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1995 |
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1996 template <class T> void deal_with_reference(T* ref_to_scan) { |
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1997 if (has_partial_array_mask(ref_to_scan)) { |
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1998 _partial_scan_cl->do_oop_nv(ref_to_scan); |
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1999 } else { |
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2000 // Note: we can use "raw" versions of "region_containing" because |
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2001 // "obj_to_scan" is definitely in the heap, and is not in a |
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2002 // humongous region. |
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2003 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
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2004 _evac_cl->set_region(r); |
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2005 _evac_cl->do_oop_nv(ref_to_scan); |
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2006 } |
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2007 } |
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2008 |
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2009 void deal_with_reference(StarTask ref) { |
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2010 assert(verify_task(ref), "sanity"); |
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2011 if (ref.is_narrow()) { |
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2012 deal_with_reference((narrowOop*)ref); |
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2013 } else { |
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2014 deal_with_reference((oop*)ref); |
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2015 } |
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2016 } |
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2017 |
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2018 public: |
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2019 void trim_queue(); |
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2020 }; |
| 1972 | 2021 |
| 2022 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1COLLECTEDHEAP_HPP |