Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 1836:894b1d7c7e01
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Reviewed-by: apetrusenko, ysr, pbk
| author | jcoomes |
|---|---|
| date | Tue, 28 Sep 2010 15:56:15 -0700 |
| parents | 8b10f48633dc |
| children | b14ec34b1e07 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2010, 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 | |
| 25 // A "G1CollectedHeap" is an implementation of a java heap for HotSpot. | |
| 26 // It uses the "Garbage First" heap organization and algorithm, which | |
| 27 // may combine concurrent marking with parallel, incremental compaction of | |
| 28 // heap subsets that will yield large amounts of garbage. | |
| 29 | |
| 30 class HeapRegion; | |
| 31 class HeapRegionSeq; | |
| 32 class PermanentGenerationSpec; | |
| 33 class GenerationSpec; | |
| 34 class OopsInHeapRegionClosure; | |
| 35 class G1ScanHeapEvacClosure; | |
| 36 class ObjectClosure; | |
| 37 class SpaceClosure; | |
| 38 class CompactibleSpaceClosure; | |
| 39 class Space; | |
| 40 class G1CollectorPolicy; | |
| 41 class GenRemSet; | |
| 42 class G1RemSet; | |
| 43 class HeapRegionRemSetIterator; | |
| 44 class ConcurrentMark; | |
| 45 class ConcurrentMarkThread; | |
| 46 class ConcurrentG1Refine; | |
| 47 class ConcurrentZFThread; | |
| 48 | |
| 1709 | 49 typedef OverflowTaskQueue<StarTask> RefToScanQueue; |
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50 typedef GenericTaskQueueSet<RefToScanQueue> RefToScanQueueSet; |
| 342 | 51 |
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52 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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53 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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54 |
| 342 | 55 enum G1GCThreadGroups { |
| 56 G1CRGroup = 0, | |
| 57 G1ZFGroup = 1, | |
| 58 G1CMGroup = 2, | |
| 59 G1CLGroup = 3 | |
| 60 }; | |
| 61 | |
| 62 enum GCAllocPurpose { | |
| 63 GCAllocForTenured, | |
| 64 GCAllocForSurvived, | |
| 65 GCAllocPurposeCount | |
| 66 }; | |
| 67 | |
| 68 class YoungList : public CHeapObj { | |
| 69 private: | |
| 70 G1CollectedHeap* _g1h; | |
| 71 | |
| 72 HeapRegion* _head; | |
| 73 | |
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74 HeapRegion* _survivor_head; |
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75 HeapRegion* _survivor_tail; |
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76 |
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77 HeapRegion* _curr; |
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78 |
| 342 | 79 size_t _length; |
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80 size_t _survivor_length; |
| 342 | 81 |
| 82 size_t _last_sampled_rs_lengths; | |
| 83 size_t _sampled_rs_lengths; | |
| 84 | |
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85 void empty_list(HeapRegion* list); |
| 342 | 86 |
| 87 public: | |
| 88 YoungList(G1CollectedHeap* g1h); | |
| 89 | |
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90 void push_region(HeapRegion* hr); |
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91 void add_survivor_region(HeapRegion* hr); |
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92 |
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93 void empty_list(); |
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94 bool is_empty() { return _length == 0; } |
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95 size_t length() { return _length; } |
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96 size_t survivor_length() { return _survivor_length; } |
| 342 | 97 |
| 98 void rs_length_sampling_init(); | |
| 99 bool rs_length_sampling_more(); | |
| 100 void rs_length_sampling_next(); | |
| 101 | |
| 102 void reset_sampled_info() { | |
| 103 _last_sampled_rs_lengths = 0; | |
| 104 } | |
| 105 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
| 106 | |
| 107 // for development purposes | |
| 108 void reset_auxilary_lists(); | |
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109 void clear() { _head = NULL; _length = 0; } |
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110 |
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111 void clear_survivors() { |
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112 _survivor_head = NULL; |
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113 _survivor_tail = NULL; |
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114 _survivor_length = 0; |
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115 } |
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116 |
| 342 | 117 HeapRegion* first_region() { return _head; } |
| 118 HeapRegion* first_survivor_region() { return _survivor_head; } | |
| 545 | 119 HeapRegion* last_survivor_region() { return _survivor_tail; } |
| 342 | 120 |
| 121 // debugging | |
| 122 bool check_list_well_formed(); | |
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123 bool check_list_empty(bool check_sample = true); |
| 342 | 124 void print(); |
| 125 }; | |
| 126 | |
| 127 class RefineCardTableEntryClosure; | |
| 128 class G1CollectedHeap : public SharedHeap { | |
| 129 friend class VM_G1CollectForAllocation; | |
| 130 friend class VM_GenCollectForPermanentAllocation; | |
| 131 friend class VM_G1CollectFull; | |
| 132 friend class VM_G1IncCollectionPause; | |
| 133 friend class VMStructs; | |
| 134 | |
| 135 // Closures used in implementation. | |
| 136 friend class G1ParCopyHelper; | |
| 137 friend class G1IsAliveClosure; | |
| 138 friend class G1EvacuateFollowersClosure; | |
| 139 friend class G1ParScanThreadState; | |
| 140 friend class G1ParScanClosureSuper; | |
| 141 friend class G1ParEvacuateFollowersClosure; | |
| 142 friend class G1ParTask; | |
| 143 friend class G1FreeGarbageRegionClosure; | |
| 144 friend class RefineCardTableEntryClosure; | |
| 145 friend class G1PrepareCompactClosure; | |
| 146 friend class RegionSorter; | |
| 147 friend class CountRCClosure; | |
| 148 friend class EvacPopObjClosure; | |
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149 friend class G1ParCleanupCTTask; |
| 342 | 150 |
| 151 // Other related classes. | |
| 152 friend class G1MarkSweep; | |
| 153 | |
| 154 private: | |
| 155 // The one and only G1CollectedHeap, so static functions can find it. | |
| 156 static G1CollectedHeap* _g1h; | |
| 157 | |
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158 static size_t _humongous_object_threshold_in_words; |
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159 |
| 342 | 160 // Storage for the G1 heap (excludes the permanent generation). |
| 161 VirtualSpace _g1_storage; | |
| 162 MemRegion _g1_reserved; | |
| 163 | |
| 164 // The part of _g1_storage that is currently committed. | |
| 165 MemRegion _g1_committed; | |
| 166 | |
| 167 // The maximum part of _g1_storage that has ever been committed. | |
| 168 MemRegion _g1_max_committed; | |
| 169 | |
| 170 // The number of regions that are completely free. | |
| 171 size_t _free_regions; | |
| 172 | |
| 173 // The number of regions we could create by expansion. | |
| 174 size_t _expansion_regions; | |
| 175 | |
| 176 // Return the number of free regions in the heap (by direct counting.) | |
| 177 size_t count_free_regions(); | |
| 178 // Return the number of free regions on the free and unclean lists. | |
| 179 size_t count_free_regions_list(); | |
| 180 | |
| 181 // The block offset table for the G1 heap. | |
| 182 G1BlockOffsetSharedArray* _bot_shared; | |
| 183 | |
| 184 // Move all of the regions off the free lists, then rebuild those free | |
| 185 // lists, before and after full GC. | |
| 186 void tear_down_region_lists(); | |
| 187 void rebuild_region_lists(); | |
| 188 // This sets all non-empty regions to need zero-fill (which they will if | |
| 189 // they are empty after full collection.) | |
| 190 void set_used_regions_to_need_zero_fill(); | |
| 191 | |
| 192 // The sequence of all heap regions in the heap. | |
| 193 HeapRegionSeq* _hrs; | |
| 194 | |
| 195 // The region from which normal-sized objects are currently being | |
| 196 // allocated. May be NULL. | |
| 197 HeapRegion* _cur_alloc_region; | |
| 198 | |
| 199 // Postcondition: cur_alloc_region == NULL. | |
| 200 void abandon_cur_alloc_region(); | |
| 636 | 201 void abandon_gc_alloc_regions(); |
| 342 | 202 |
| 203 // The to-space memory regions into which objects are being copied during | |
| 204 // a GC. | |
| 205 HeapRegion* _gc_alloc_regions[GCAllocPurposeCount]; | |
| 545 | 206 size_t _gc_alloc_region_counts[GCAllocPurposeCount]; |
| 636 | 207 // These are the regions, one per GCAllocPurpose, that are half-full |
| 208 // at the end of a collection and that we want to reuse during the | |
| 209 // next collection. | |
| 210 HeapRegion* _retained_gc_alloc_regions[GCAllocPurposeCount]; | |
| 211 // This specifies whether we will keep the last half-full region at | |
| 212 // the end of a collection so that it can be reused during the next | |
| 213 // collection (this is specified per GCAllocPurpose) | |
| 214 bool _retain_gc_alloc_region[GCAllocPurposeCount]; | |
| 342 | 215 |
| 216 // A list of the regions that have been set to be alloc regions in the | |
| 217 // current collection. | |
| 218 HeapRegion* _gc_alloc_region_list; | |
| 219 | |
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220 // Determines PLAB size for a particular allocation purpose. |
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221 static size_t desired_plab_sz(GCAllocPurpose purpose); |
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222 |
| 342 | 223 // When called by par thread, require par_alloc_during_gc_lock() to be held. |
| 224 void push_gc_alloc_region(HeapRegion* hr); | |
| 225 | |
| 226 // This should only be called single-threaded. Undeclares all GC alloc | |
| 227 // regions. | |
| 228 void forget_alloc_region_list(); | |
| 229 | |
| 230 // Should be used to set an alloc region, because there's other | |
| 231 // associated bookkeeping. | |
| 232 void set_gc_alloc_region(int purpose, HeapRegion* r); | |
| 233 | |
| 234 // Check well-formedness of alloc region list. | |
| 235 bool check_gc_alloc_regions(); | |
| 236 | |
| 237 // Outside of GC pauses, the number of bytes used in all regions other | |
| 238 // than the current allocation region. | |
| 239 size_t _summary_bytes_used; | |
| 240 | |
| 526 | 241 // This is used for a quick test on whether a reference points into |
| 242 // the collection set or not. Basically, we have an array, with one | |
| 243 // byte per region, and that byte denotes whether the corresponding | |
| 244 // region is in the collection set or not. The entry corresponding | |
| 245 // the bottom of the heap, i.e., region 0, is pointed to by | |
| 246 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
| 247 // biased so that it actually points to address 0 of the address | |
| 248 // space, to make the test as fast as possible (we can simply shift | |
| 249 // the address to address into it, instead of having to subtract the | |
| 250 // bottom of the heap from the address before shifting it; basically | |
| 251 // it works in the same way the card table works). | |
| 252 bool* _in_cset_fast_test; | |
| 253 | |
| 254 // The allocated array used for the fast test on whether a reference | |
| 255 // points into the collection set or not. This field is also used to | |
| 256 // free the array. | |
| 257 bool* _in_cset_fast_test_base; | |
| 258 | |
| 259 // The length of the _in_cset_fast_test_base array. | |
| 260 size_t _in_cset_fast_test_length; | |
| 261 | |
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262 volatile unsigned _gc_time_stamp; |
| 342 | 263 |
| 264 size_t* _surviving_young_words; | |
| 265 | |
| 266 void setup_surviving_young_words(); | |
| 267 void update_surviving_young_words(size_t* surv_young_words); | |
| 268 void cleanup_surviving_young_words(); | |
| 269 | |
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270 // It decides whether an explicit GC should start a concurrent cycle |
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271 // instead of doing a STW GC. Currently, a concurrent cycle is |
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272 // explicitly started if: |
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273 // (a) cause == _gc_locker and +GCLockerInvokesConcurrent, or |
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274 // (b) cause == _java_lang_system_gc and +ExplicitGCInvokesConcurrent. |
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275 bool should_do_concurrent_full_gc(GCCause::Cause cause); |
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276 |
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277 // Keeps track of how many "full collections" (i.e., Full GCs or |
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278 // concurrent cycles) we have completed. The number of them we have |
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279 // started is maintained in _total_full_collections in CollectedHeap. |
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280 volatile unsigned int _full_collections_completed; |
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281 |
| 342 | 282 protected: |
| 283 | |
| 284 // Returns "true" iff none of the gc alloc regions have any allocations | |
| 285 // since the last call to "save_marks". | |
| 286 bool all_alloc_regions_no_allocs_since_save_marks(); | |
| 545 | 287 // Perform finalization stuff on all allocation regions. |
| 288 void retire_all_alloc_regions(); | |
| 342 | 289 |
| 290 // The number of regions allocated to hold humongous objects. | |
| 291 int _num_humongous_regions; | |
| 292 YoungList* _young_list; | |
| 293 | |
| 294 // The current policy object for the collector. | |
| 295 G1CollectorPolicy* _g1_policy; | |
| 296 | |
| 297 // Parallel allocation lock to protect the current allocation region. | |
| 298 Mutex _par_alloc_during_gc_lock; | |
| 299 Mutex* par_alloc_during_gc_lock() { return &_par_alloc_during_gc_lock; } | |
| 300 | |
| 301 // If possible/desirable, allocate a new HeapRegion for normal object | |
| 302 // allocation sufficient for an allocation of the given "word_size". | |
| 303 // If "do_expand" is true, will attempt to expand the heap if necessary | |
| 304 // to to satisfy the request. If "zero_filled" is true, requires a | |
| 305 // zero-filled region. | |
| 306 // (Returning NULL will trigger a GC.) | |
| 307 virtual HeapRegion* newAllocRegion_work(size_t word_size, | |
| 308 bool do_expand, | |
| 309 bool zero_filled); | |
| 310 | |
| 311 virtual HeapRegion* newAllocRegion(size_t word_size, | |
| 312 bool zero_filled = true) { | |
| 313 return newAllocRegion_work(word_size, false, zero_filled); | |
| 314 } | |
| 315 virtual HeapRegion* newAllocRegionWithExpansion(int purpose, | |
| 316 size_t word_size, | |
| 317 bool zero_filled = true); | |
| 318 | |
| 319 // Attempt to allocate an object of the given (very large) "word_size". | |
| 320 // Returns "NULL" on failure. | |
| 321 virtual HeapWord* humongousObjAllocate(size_t word_size); | |
| 322 | |
| 323 // If possible, allocate a block of the given word_size, else return "NULL". | |
| 324 // Returning NULL will trigger GC or heap expansion. | |
| 325 // These two methods have rather awkward pre- and | |
| 326 // post-conditions. If they are called outside a safepoint, then | |
| 327 // they assume that the caller is holding the heap lock. Upon return | |
| 328 // they release the heap lock, if they are returning a non-NULL | |
| 329 // value. attempt_allocation_slow() also dirties the cards of a | |
| 330 // newly-allocated young region after it releases the heap | |
| 331 // lock. This change in interface was the neatest way to achieve | |
| 332 // this card dirtying without affecting mem_allocate(), which is a | |
| 333 // more frequently called method. We tried two or three different | |
| 334 // approaches, but they were even more hacky. | |
| 335 HeapWord* attempt_allocation(size_t word_size, | |
| 336 bool permit_collection_pause = true); | |
| 337 | |
| 338 HeapWord* attempt_allocation_slow(size_t word_size, | |
| 339 bool permit_collection_pause = true); | |
| 340 | |
| 341 // Allocate blocks during garbage collection. Will ensure an | |
| 342 // allocation region, either by picking one or expanding the | |
| 343 // heap, and then allocate a block of the given size. The block | |
| 344 // may not be a humongous - it must fit into a single heap region. | |
| 345 HeapWord* allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
| 346 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
| 347 | |
| 348 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, | |
| 349 HeapRegion* alloc_region, | |
| 350 bool par, | |
| 351 size_t word_size); | |
| 352 | |
| 353 // Ensure that no further allocations can happen in "r", bearing in mind | |
| 354 // that parallel threads might be attempting allocations. | |
| 355 void par_allocate_remaining_space(HeapRegion* r); | |
| 356 | |
| 545 | 357 // Retires an allocation region when it is full or at the end of a |
| 358 // GC pause. | |
| 359 void retire_alloc_region(HeapRegion* alloc_region, bool par); | |
| 360 | |
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361 // - if explicit_gc is true, the GC is for a System.gc() or a heap |
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362 // inspection request and should collect the entire heap |
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363 // - if clear_all_soft_refs is true, all soft references are cleared |
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364 // during the GC |
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365 // - if explicit_gc is false, word_size describes the allocation that |
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366 // the GC should attempt (at least) to satisfy |
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367 void do_collection(bool explicit_gc, |
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368 bool clear_all_soft_refs, |
| 342 | 369 size_t word_size); |
| 370 | |
| 371 // Callback from VM_G1CollectFull operation. | |
| 372 // Perform a full collection. | |
| 373 void do_full_collection(bool clear_all_soft_refs); | |
| 374 | |
| 375 // Resize the heap if necessary after a full collection. If this is | |
| 376 // after a collect-for allocation, "word_size" is the allocation size, | |
| 377 // and will be considered part of the used portion of the heap. | |
| 378 void resize_if_necessary_after_full_collection(size_t word_size); | |
| 379 | |
| 380 // Callback from VM_G1CollectForAllocation operation. | |
| 381 // This function does everything necessary/possible to satisfy a | |
| 382 // failed allocation request (including collection, expansion, etc.) | |
| 383 HeapWord* satisfy_failed_allocation(size_t word_size); | |
| 384 | |
| 385 // Attempting to expand the heap sufficiently | |
| 386 // to support an allocation of the given "word_size". If | |
| 387 // successful, perform the allocation and return the address of the | |
| 388 // allocated block, or else "NULL". | |
| 389 virtual HeapWord* expand_and_allocate(size_t word_size); | |
| 390 | |
| 391 public: | |
| 392 // Expand the garbage-first heap by at least the given size (in bytes!). | |
| 393 // (Rounds up to a HeapRegion boundary.) | |
| 394 virtual void expand(size_t expand_bytes); | |
| 395 | |
| 396 // Do anything common to GC's. | |
| 397 virtual void gc_prologue(bool full); | |
| 398 virtual void gc_epilogue(bool full); | |
| 399 | |
| 526 | 400 // We register a region with the fast "in collection set" test. We |
| 401 // simply set to true the array slot corresponding to this region. | |
| 402 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
| 403 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
| 404 assert(r->in_collection_set(), "invariant"); | |
| 405 int index = r->hrs_index(); | |
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406 assert(0 <= index && (size_t) index < _in_cset_fast_test_length, "invariant"); |
| 526 | 407 assert(!_in_cset_fast_test_base[index], "invariant"); |
| 408 _in_cset_fast_test_base[index] = true; | |
| 409 } | |
| 410 | |
| 411 // This is a fast test on whether a reference points into the | |
| 412 // collection set or not. It does not assume that the reference | |
| 413 // points into the heap; if it doesn't, it will return false. | |
| 414 bool in_cset_fast_test(oop obj) { | |
| 415 assert(_in_cset_fast_test != NULL, "sanity"); | |
| 416 if (_g1_committed.contains((HeapWord*) obj)) { | |
| 417 // no need to subtract the bottom of the heap from obj, | |
| 418 // _in_cset_fast_test is biased | |
| 419 size_t index = ((size_t) obj) >> HeapRegion::LogOfHRGrainBytes; | |
| 420 bool ret = _in_cset_fast_test[index]; | |
| 421 // let's make sure the result is consistent with what the slower | |
| 422 // test returns | |
| 423 assert( ret || !obj_in_cs(obj), "sanity"); | |
| 424 assert(!ret || obj_in_cs(obj), "sanity"); | |
| 425 return ret; | |
| 426 } else { | |
| 427 return false; | |
| 428 } | |
| 429 } | |
| 430 | |
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431 void clear_cset_fast_test() { |
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432 assert(_in_cset_fast_test_base != NULL, "sanity"); |
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433 memset(_in_cset_fast_test_base, false, |
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434 _in_cset_fast_test_length * sizeof(bool)); |
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435 } |
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436 |
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437 // This is called at the end of either a concurrent cycle or a Full |
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438 // GC to update the number of full collections completed. Those two |
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439 // can happen in a nested fashion, i.e., we start a concurrent |
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440 // cycle, a Full GC happens half-way through it which ends first, |
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441 // and then the cycle notices that a Full GC happened and ends |
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442 // too. The outer parameter is a boolean to help us do a bit tighter |
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443 // consistency checking in the method. If outer is false, the caller |
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444 // is the inner caller in the nesting (i.e., the Full GC). If outer |
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445 // is true, the caller is the outer caller in this nesting (i.e., |
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446 // the concurrent cycle). Further nesting is not currently |
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447 // supported. The end of the this call also notifies the |
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448 // FullGCCount_lock in case a Java thread is waiting for a full GC |
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449 // to happen (e.g., it called System.gc() with |
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450 // +ExplicitGCInvokesConcurrent). |
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451 void increment_full_collections_completed(bool outer); |
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452 |
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453 unsigned int full_collections_completed() { |
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454 return _full_collections_completed; |
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455 } |
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456 |
| 342 | 457 protected: |
| 458 | |
| 459 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
| 460 // (Rounds down to a HeapRegion boundary.) | |
| 461 virtual void shrink(size_t expand_bytes); | |
| 462 void shrink_helper(size_t expand_bytes); | |
| 463 | |
| 1709 | 464 #if TASKQUEUE_STATS |
| 465 static void print_taskqueue_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 466 void print_taskqueue_stats(outputStream* const st = gclog_or_tty) const; | |
| 467 void reset_taskqueue_stats(); | |
| 468 #endif // TASKQUEUE_STATS | |
| 469 | |
| 342 | 470 // Do an incremental collection: identify a collection set, and evacuate |
| 471 // its live objects elsewhere. | |
| 472 virtual void do_collection_pause(); | |
| 473 | |
| 474 // The guts of the incremental collection pause, executed by the vm | |
| 677 | 475 // thread. |
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476 virtual void do_collection_pause_at_safepoint(double target_pause_time_ms); |
| 342 | 477 |
| 478 // Actually do the work of evacuating the collection set. | |
| 479 virtual void evacuate_collection_set(); | |
| 480 | |
| 481 // If this is an appropriate right time, do a collection pause. | |
| 482 // The "word_size" argument, if non-zero, indicates the size of an | |
| 483 // allocation request that is prompting this query. | |
| 484 void do_collection_pause_if_appropriate(size_t word_size); | |
| 485 | |
| 486 // The g1 remembered set of the heap. | |
| 487 G1RemSet* _g1_rem_set; | |
| 488 // And it's mod ref barrier set, used to track updates for the above. | |
| 489 ModRefBarrierSet* _mr_bs; | |
| 490 | |
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491 // A set of cards that cover the objects for which the Rsets should be updated |
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492 // concurrently after the collection. |
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493 DirtyCardQueueSet _dirty_card_queue_set; |
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494 |
| 342 | 495 // The Heap Region Rem Set Iterator. |
| 496 HeapRegionRemSetIterator** _rem_set_iterator; | |
| 497 | |
| 498 // The closure used to refine a single card. | |
| 499 RefineCardTableEntryClosure* _refine_cte_cl; | |
| 500 | |
| 501 // A function to check the consistency of dirty card logs. | |
| 502 void check_ct_logs_at_safepoint(); | |
| 503 | |
| 1705 | 504 // A DirtyCardQueueSet that is used to hold cards that contain |
| 505 // references into the current collection set. This is used to | |
| 506 // update the remembered sets of the regions in the collection | |
| 507 // set in the event of an evacuation failure. | |
| 508 DirtyCardQueueSet _into_cset_dirty_card_queue_set; | |
| 509 | |
| 342 | 510 // After a collection pause, make the regions in the CS into free |
| 511 // regions. | |
| 512 void free_collection_set(HeapRegion* cs_head); | |
| 513 | |
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514 // Abandon the current collection set without recording policy |
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515 // statistics or updating free lists. |
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516 void abandon_collection_set(HeapRegion* cs_head); |
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517 |
| 342 | 518 // Applies "scan_non_heap_roots" to roots outside the heap, |
| 519 // "scan_rs" to roots inside the heap (having done "set_region" to | |
| 520 // indicate the region in which the root resides), and does "scan_perm" | |
| 521 // (setting the generation to the perm generation.) If "scan_rs" is | |
| 522 // NULL, then this step is skipped. The "worker_i" | |
| 523 // param is for use with parallel roots processing, and should be | |
| 524 // the "i" of the calling parallel worker thread's work(i) function. | |
| 525 // In the sequential case this param will be ignored. | |
| 526 void g1_process_strong_roots(bool collecting_perm_gen, | |
| 527 SharedHeap::ScanningOption so, | |
| 528 OopClosure* scan_non_heap_roots, | |
| 529 OopsInHeapRegionClosure* scan_rs, | |
| 530 OopsInGenClosure* scan_perm, | |
| 531 int worker_i); | |
| 532 | |
| 533 // Apply "blk" to all the weak roots of the system. These include | |
| 534 // JNI weak roots, the code cache, system dictionary, symbol table, | |
| 535 // string table, and referents of reachable weak refs. | |
| 536 void g1_process_weak_roots(OopClosure* root_closure, | |
| 537 OopClosure* non_root_closure); | |
| 538 | |
| 539 // Invoke "save_marks" on all heap regions. | |
| 540 void save_marks(); | |
| 541 | |
| 542 // Free a heap region. | |
| 543 void free_region(HeapRegion* hr); | |
| 544 // A component of "free_region", exposed for 'batching'. | |
| 545 // All the params after "hr" are out params: the used bytes of the freed | |
| 546 // region(s), the number of H regions cleared, the number of regions | |
| 547 // freed, and pointers to the head and tail of a list of freed contig | |
| 548 // regions, linked throught the "next_on_unclean_list" field. | |
| 549 void free_region_work(HeapRegion* hr, | |
| 550 size_t& pre_used, | |
| 551 size_t& cleared_h, | |
| 552 size_t& freed_regions, | |
| 553 UncleanRegionList* list, | |
| 554 bool par = false); | |
| 555 | |
| 556 | |
| 557 // The concurrent marker (and the thread it runs in.) | |
| 558 ConcurrentMark* _cm; | |
| 559 ConcurrentMarkThread* _cmThread; | |
| 560 bool _mark_in_progress; | |
| 561 | |
| 562 // The concurrent refiner. | |
| 563 ConcurrentG1Refine* _cg1r; | |
| 564 | |
| 565 // The concurrent zero-fill thread. | |
| 566 ConcurrentZFThread* _czft; | |
| 567 | |
| 568 // The parallel task queues | |
| 569 RefToScanQueueSet *_task_queues; | |
| 570 | |
| 571 // True iff a evacuation has failed in the current collection. | |
| 572 bool _evacuation_failed; | |
| 573 | |
| 574 // Set the attribute indicating whether evacuation has failed in the | |
| 575 // current collection. | |
| 576 void set_evacuation_failed(bool b) { _evacuation_failed = b; } | |
| 577 | |
| 578 // Failed evacuations cause some logical from-space objects to have | |
| 579 // forwarding pointers to themselves. Reset them. | |
| 580 void remove_self_forwarding_pointers(); | |
| 581 | |
| 582 // When one is non-null, so is the other. Together, they each pair is | |
| 583 // an object with a preserved mark, and its mark value. | |
| 584 GrowableArray<oop>* _objs_with_preserved_marks; | |
| 585 GrowableArray<markOop>* _preserved_marks_of_objs; | |
| 586 | |
| 587 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
| 588 // word being overwritten with a self-forwarding-pointer. | |
| 589 void preserve_mark_if_necessary(oop obj, markOop m); | |
| 590 | |
| 591 // The stack of evac-failure objects left to be scanned. | |
| 592 GrowableArray<oop>* _evac_failure_scan_stack; | |
| 593 // The closure to apply to evac-failure objects. | |
| 594 | |
| 595 OopsInHeapRegionClosure* _evac_failure_closure; | |
| 596 // Set the field above. | |
| 597 void | |
| 598 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
| 599 _evac_failure_closure = evac_failure_closure; | |
| 600 } | |
| 601 | |
| 602 // Push "obj" on the scan stack. | |
| 603 void push_on_evac_failure_scan_stack(oop obj); | |
| 604 // Process scan stack entries until the stack is empty. | |
| 605 void drain_evac_failure_scan_stack(); | |
| 606 // True iff an invocation of "drain_scan_stack" is in progress; to | |
| 607 // prevent unnecessary recursion. | |
| 608 bool _drain_in_progress; | |
| 609 | |
| 610 // Do any necessary initialization for evacuation-failure handling. | |
| 611 // "cl" is the closure that will be used to process evac-failure | |
| 612 // objects. | |
| 613 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
| 614 // Do any necessary cleanup for evacuation-failure handling data | |
| 615 // structures. | |
| 616 void finalize_for_evac_failure(); | |
| 617 | |
| 618 // An attempt to evacuate "obj" has failed; take necessary steps. | |
| 619 void handle_evacuation_failure(oop obj); | |
| 620 oop handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, oop obj); | |
| 621 void handle_evacuation_failure_common(oop obj, markOop m); | |
| 622 | |
| 623 | |
| 624 // Ensure that the relevant gc_alloc regions are set. | |
| 625 void get_gc_alloc_regions(); | |
| 636 | 626 // We're done with GC alloc regions. We are going to tear down the |
| 627 // gc alloc list and remove the gc alloc tag from all the regions on | |
| 628 // that list. However, we will also retain the last (i.e., the one | |
| 629 // that is half-full) GC alloc region, per GCAllocPurpose, for | |
| 630 // possible reuse during the next collection, provided | |
| 631 // _retain_gc_alloc_region[] indicates that it should be the | |
| 632 // case. Said regions are kept in the _retained_gc_alloc_regions[] | |
| 633 // array. If the parameter totally is set, we will not retain any | |
| 634 // regions, irrespective of what _retain_gc_alloc_region[] | |
| 635 // indicates. | |
| 636 void release_gc_alloc_regions(bool totally); | |
| 637 #ifndef PRODUCT | |
| 638 // Useful for debugging. | |
| 639 void print_gc_alloc_regions(); | |
| 640 #endif // !PRODUCT | |
| 342 | 641 |
| 642 // ("Weak") Reference processing support | |
| 643 ReferenceProcessor* _ref_processor; | |
| 644 | |
| 645 enum G1H_process_strong_roots_tasks { | |
| 646 G1H_PS_mark_stack_oops_do, | |
| 647 G1H_PS_refProcessor_oops_do, | |
| 648 // Leave this one last. | |
| 649 G1H_PS_NumElements | |
| 650 }; | |
| 651 | |
| 652 SubTasksDone* _process_strong_tasks; | |
| 653 | |
| 654 // List of regions which require zero filling. | |
| 655 UncleanRegionList _unclean_region_list; | |
| 656 bool _unclean_regions_coming; | |
| 657 | |
| 658 public: | |
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659 |
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660 SubTasksDone* process_strong_tasks() { return _process_strong_tasks; } |
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661 |
| 342 | 662 void set_refine_cte_cl_concurrency(bool concurrent); |
| 663 | |
| 1709 | 664 RefToScanQueue *task_queue(int i) const; |
| 342 | 665 |
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666 // A set of cards where updates happened during the GC |
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667 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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668 |
| 1705 | 669 // A DirtyCardQueueSet that is used to hold cards that contain |
| 670 // references into the current collection set. This is used to | |
| 671 // update the remembered sets of the regions in the collection | |
| 672 // set in the event of an evacuation failure. | |
| 673 DirtyCardQueueSet& into_cset_dirty_card_queue_set() | |
| 674 { return _into_cset_dirty_card_queue_set; } | |
| 675 | |
| 342 | 676 // Create a G1CollectedHeap with the specified policy. |
| 677 // Must call the initialize method afterwards. | |
| 678 // May not return if something goes wrong. | |
| 679 G1CollectedHeap(G1CollectorPolicy* policy); | |
| 680 | |
| 681 // Initialize the G1CollectedHeap to have the initial and | |
| 682 // maximum sizes, permanent generation, and remembered and barrier sets | |
| 683 // specified by the policy object. | |
| 684 jint initialize(); | |
| 685 | |
| 686 void ref_processing_init(); | |
| 687 | |
| 688 void set_par_threads(int t) { | |
| 689 SharedHeap::set_par_threads(t); | |
|
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690 _process_strong_tasks->set_n_threads(t); |
| 342 | 691 } |
| 692 | |
| 693 virtual CollectedHeap::Name kind() const { | |
| 694 return CollectedHeap::G1CollectedHeap; | |
| 695 } | |
| 696 | |
| 697 // The current policy object for the collector. | |
| 698 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
| 699 | |
| 700 // Adaptive size policy. No such thing for g1. | |
| 701 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
| 702 | |
| 703 // The rem set and barrier set. | |
| 704 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
| 705 ModRefBarrierSet* mr_bs() const { return _mr_bs; } | |
| 706 | |
| 707 // The rem set iterator. | |
| 708 HeapRegionRemSetIterator* rem_set_iterator(int i) { | |
| 709 return _rem_set_iterator[i]; | |
| 710 } | |
| 711 | |
| 712 HeapRegionRemSetIterator* rem_set_iterator() { | |
| 713 return _rem_set_iterator[0]; | |
| 714 } | |
| 715 | |
| 716 unsigned get_gc_time_stamp() { | |
| 717 return _gc_time_stamp; | |
| 718 } | |
| 719 | |
| 720 void reset_gc_time_stamp() { | |
| 721 _gc_time_stamp = 0; | |
|
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722 OrderAccess::fence(); |
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723 } |
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724 |
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725 void increment_gc_time_stamp() { |
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726 ++_gc_time_stamp; |
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727 OrderAccess::fence(); |
| 342 | 728 } |
| 729 | |
| 1705 | 730 void iterate_dirty_card_closure(CardTableEntryClosure* cl, |
| 731 DirtyCardQueue* into_cset_dcq, | |
| 732 bool concurrent, int worker_i); | |
| 342 | 733 |
| 734 // The shared block offset table array. | |
| 735 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
| 736 | |
| 737 // Reference Processing accessor | |
| 738 ReferenceProcessor* ref_processor() { return _ref_processor; } | |
| 739 | |
| 740 // Reserved (g1 only; super method includes perm), capacity and the used | |
| 741 // portion in bytes. | |
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742 size_t g1_reserved_obj_bytes() const { return _g1_reserved.byte_size(); } |
| 342 | 743 virtual size_t capacity() const; |
| 744 virtual size_t used() const; | |
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745 // This should be called when we're not holding the heap lock. The |
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746 // result might be a bit inaccurate. |
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747 size_t used_unlocked() const; |
| 342 | 748 size_t recalculate_used() const; |
| 749 #ifndef PRODUCT | |
| 750 size_t recalculate_used_regions() const; | |
| 751 #endif // PRODUCT | |
| 752 | |
| 753 // These virtual functions do the actual allocation. | |
| 754 virtual HeapWord* mem_allocate(size_t word_size, | |
| 755 bool is_noref, | |
| 756 bool is_tlab, | |
| 757 bool* gc_overhead_limit_was_exceeded); | |
| 758 | |
| 759 // Some heaps may offer a contiguous region for shared non-blocking | |
| 760 // allocation, via inlined code (by exporting the address of the top and | |
| 761 // end fields defining the extent of the contiguous allocation region.) | |
| 762 // But G1CollectedHeap doesn't yet support this. | |
| 763 | |
| 764 // Return an estimate of the maximum allocation that could be performed | |
| 765 // without triggering any collection or expansion activity. In a | |
| 766 // generational collector, for example, this is probably the largest | |
| 767 // allocation that could be supported (without expansion) in the youngest | |
| 768 // generation. It is "unsafe" because no locks are taken; the result | |
| 769 // should be treated as an approximation, not a guarantee, for use in | |
| 770 // heuristic resizing decisions. | |
| 771 virtual size_t unsafe_max_alloc(); | |
| 772 | |
| 773 virtual bool is_maximal_no_gc() const { | |
| 774 return _g1_storage.uncommitted_size() == 0; | |
| 775 } | |
| 776 | |
| 777 // The total number of regions in the heap. | |
| 778 size_t n_regions(); | |
| 779 | |
| 780 // The number of regions that are completely free. | |
| 781 size_t max_regions(); | |
| 782 | |
| 783 // The number of regions that are completely free. | |
| 784 size_t free_regions(); | |
| 785 | |
| 786 // The number of regions that are not completely free. | |
| 787 size_t used_regions() { return n_regions() - free_regions(); } | |
| 788 | |
| 789 // True iff the ZF thread should run. | |
| 790 bool should_zf(); | |
| 791 | |
| 792 // The number of regions available for "regular" expansion. | |
| 793 size_t expansion_regions() { return _expansion_regions; } | |
| 794 | |
| 795 #ifndef PRODUCT | |
| 796 bool regions_accounted_for(); | |
| 797 bool print_region_accounting_info(); | |
| 798 void print_region_counts(); | |
| 799 #endif | |
| 800 | |
| 801 HeapRegion* alloc_region_from_unclean_list(bool zero_filled); | |
| 802 HeapRegion* alloc_region_from_unclean_list_locked(bool zero_filled); | |
| 803 | |
| 804 void put_region_on_unclean_list(HeapRegion* r); | |
| 805 void put_region_on_unclean_list_locked(HeapRegion* r); | |
| 806 | |
| 807 void prepend_region_list_on_unclean_list(UncleanRegionList* list); | |
| 808 void prepend_region_list_on_unclean_list_locked(UncleanRegionList* list); | |
| 809 | |
| 810 void set_unclean_regions_coming(bool b); | |
| 811 void set_unclean_regions_coming_locked(bool b); | |
| 812 // Wait for cleanup to be complete. | |
| 813 void wait_for_cleanup_complete(); | |
| 814 // Like above, but assumes that the calling thread owns the Heap_lock. | |
| 815 void wait_for_cleanup_complete_locked(); | |
| 816 | |
| 817 // Return the head of the unclean list. | |
| 818 HeapRegion* peek_unclean_region_list_locked(); | |
| 819 // Remove and return the head of the unclean list. | |
| 820 HeapRegion* pop_unclean_region_list_locked(); | |
| 821 | |
| 822 // List of regions which are zero filled and ready for allocation. | |
| 823 HeapRegion* _free_region_list; | |
| 824 // Number of elements on the free list. | |
| 825 size_t _free_region_list_size; | |
| 826 | |
| 827 // If the head of the unclean list is ZeroFilled, move it to the free | |
| 828 // list. | |
| 829 bool move_cleaned_region_to_free_list_locked(); | |
| 830 bool move_cleaned_region_to_free_list(); | |
| 831 | |
| 832 void put_free_region_on_list_locked(HeapRegion* r); | |
| 833 void put_free_region_on_list(HeapRegion* r); | |
| 834 | |
| 835 // Remove and return the head element of the free list. | |
| 836 HeapRegion* pop_free_region_list_locked(); | |
| 837 | |
| 838 // If "zero_filled" is true, we first try the free list, then we try the | |
| 839 // unclean list, zero-filling the result. If "zero_filled" is false, we | |
| 840 // first try the unclean list, then the zero-filled list. | |
| 841 HeapRegion* alloc_free_region_from_lists(bool zero_filled); | |
| 842 | |
| 843 // Verify the integrity of the region lists. | |
| 844 void remove_allocated_regions_from_lists(); | |
| 845 bool verify_region_lists(); | |
| 846 bool verify_region_lists_locked(); | |
| 847 size_t unclean_region_list_length(); | |
| 848 size_t free_region_list_length(); | |
| 849 | |
| 850 // Perform a collection of the heap; intended for use in implementing | |
| 851 // "System.gc". This probably implies as full a collection as the | |
| 852 // "CollectedHeap" supports. | |
| 853 virtual void collect(GCCause::Cause cause); | |
| 854 | |
| 855 // The same as above but assume that the caller holds the Heap_lock. | |
| 856 void collect_locked(GCCause::Cause cause); | |
| 857 | |
| 858 // This interface assumes that it's being called by the | |
| 859 // vm thread. It collects the heap assuming that the | |
| 860 // heap lock is already held and that we are executing in | |
| 861 // the context of the vm thread. | |
| 862 virtual void collect_as_vm_thread(GCCause::Cause cause); | |
| 863 | |
| 864 // True iff a evacuation has failed in the most-recent collection. | |
| 865 bool evacuation_failed() { return _evacuation_failed; } | |
| 866 | |
| 867 // Free a region if it is totally full of garbage. Returns the number of | |
| 868 // bytes freed (0 ==> didn't free it). | |
| 869 size_t free_region_if_totally_empty(HeapRegion *hr); | |
| 870 void free_region_if_totally_empty_work(HeapRegion *hr, | |
| 871 size_t& pre_used, | |
| 872 size_t& cleared_h_regions, | |
| 873 size_t& freed_regions, | |
| 874 UncleanRegionList* list, | |
| 875 bool par = false); | |
| 876 | |
| 877 // If we've done free region work that yields the given changes, update | |
| 878 // the relevant global variables. | |
| 879 void finish_free_region_work(size_t pre_used, | |
| 880 size_t cleared_h_regions, | |
| 881 size_t freed_regions, | |
| 882 UncleanRegionList* list); | |
| 883 | |
| 884 | |
| 885 // Returns "TRUE" iff "p" points into the allocated area of the heap. | |
| 886 virtual bool is_in(const void* p) const; | |
| 887 | |
| 888 // Return "TRUE" iff the given object address is within the collection | |
| 889 // set. | |
| 890 inline bool obj_in_cs(oop obj); | |
| 891 | |
| 892 // Return "TRUE" iff the given object address is in the reserved | |
| 893 // region of g1 (excluding the permanent generation). | |
| 894 bool is_in_g1_reserved(const void* p) const { | |
| 895 return _g1_reserved.contains(p); | |
| 896 } | |
| 897 | |
| 898 // Returns a MemRegion that corresponds to the space that has been | |
| 899 // committed in the heap | |
| 900 MemRegion g1_committed() { | |
| 901 return _g1_committed; | |
| 902 } | |
| 903 | |
| 941 | 904 NOT_PRODUCT(bool is_in_closed_subset(const void* p) const;) |
| 342 | 905 |
| 906 // Dirty card table entries covering a list of young regions. | |
| 907 void dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list); | |
| 908 | |
| 909 // This resets the card table to all zeros. It is used after | |
| 910 // a collection pause which used the card table to claim cards. | |
| 911 void cleanUpCardTable(); | |
| 912 | |
| 913 // Iteration functions. | |
| 914 | |
| 915 // Iterate over all the ref-containing fields of all objects, calling | |
| 916 // "cl.do_oop" on each. | |
| 678 | 917 virtual void oop_iterate(OopClosure* cl) { |
| 918 oop_iterate(cl, true); | |
| 919 } | |
| 920 void oop_iterate(OopClosure* cl, bool do_perm); | |
| 342 | 921 |
| 922 // Same as above, restricted to a memory region. | |
| 678 | 923 virtual void oop_iterate(MemRegion mr, OopClosure* cl) { |
| 924 oop_iterate(mr, cl, true); | |
| 925 } | |
| 926 void oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm); | |
| 342 | 927 |
| 928 // Iterate over all objects, calling "cl.do_object" on each. | |
| 678 | 929 virtual void object_iterate(ObjectClosure* cl) { |
| 930 object_iterate(cl, true); | |
| 931 } | |
| 932 virtual void safe_object_iterate(ObjectClosure* cl) { | |
| 933 object_iterate(cl, true); | |
| 934 } | |
| 935 void object_iterate(ObjectClosure* cl, bool do_perm); | |
| 342 | 936 |
| 937 // Iterate over all objects allocated since the last collection, calling | |
| 938 // "cl.do_object" on each. The heap must have been initialized properly | |
| 939 // to support this function, or else this call will fail. | |
| 940 virtual void object_iterate_since_last_GC(ObjectClosure* cl); | |
| 941 | |
| 942 // Iterate over all spaces in use in the heap, in ascending address order. | |
| 943 virtual void space_iterate(SpaceClosure* cl); | |
| 944 | |
| 945 // Iterate over heap regions, in address order, terminating the | |
| 946 // iteration early if the "doHeapRegion" method returns "true". | |
| 947 void heap_region_iterate(HeapRegionClosure* blk); | |
| 948 | |
| 949 // Iterate over heap regions starting with r (or the first region if "r" | |
| 950 // is NULL), in address order, terminating early if the "doHeapRegion" | |
| 951 // method returns "true". | |
| 952 void heap_region_iterate_from(HeapRegion* r, HeapRegionClosure* blk); | |
| 953 | |
| 954 // As above but starting from the region at index idx. | |
| 955 void heap_region_iterate_from(int idx, HeapRegionClosure* blk); | |
| 956 | |
| 957 HeapRegion* region_at(size_t idx); | |
| 958 | |
| 959 // Divide the heap region sequence into "chunks" of some size (the number | |
| 960 // of regions divided by the number of parallel threads times some | |
| 961 // overpartition factor, currently 4). Assumes that this will be called | |
| 962 // in parallel by ParallelGCThreads worker threads with discinct worker | |
| 963 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
| 964 // calls will use the same "claim_value", and that that claim value is | |
| 965 // different from the claim_value of any heap region before the start of | |
| 966 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
| 967 // attempting to claim the first region in each chunk, and, if | |
| 968 // successful, applying the closure to each region in the chunk (and | |
| 969 // setting the claim value of the second and subsequent regions of the | |
| 970 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
| 971 // i.e., that a closure never attempt to abort a traversal. | |
| 972 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
| 973 int worker, | |
| 974 jint claim_value); | |
| 975 | |
| 390 | 976 // It resets all the region claim values to the default. |
| 977 void reset_heap_region_claim_values(); | |
| 978 | |
| 355 | 979 #ifdef ASSERT |
| 980 bool check_heap_region_claim_values(jint claim_value); | |
| 981 #endif // ASSERT | |
| 982 | |
| 342 | 983 // Iterate over the regions (if any) in the current collection set. |
| 984 void collection_set_iterate(HeapRegionClosure* blk); | |
| 985 | |
| 986 // As above but starting from region r | |
| 987 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
| 988 | |
| 989 // Returns the first (lowest address) compactible space in the heap. | |
| 990 virtual CompactibleSpace* first_compactible_space(); | |
| 991 | |
| 992 // A CollectedHeap will contain some number of spaces. This finds the | |
| 993 // space containing a given address, or else returns NULL. | |
| 994 virtual Space* space_containing(const void* addr) const; | |
| 995 | |
| 996 // A G1CollectedHeap will contain some number of heap regions. This | |
| 997 // finds the region containing a given address, or else returns NULL. | |
| 998 HeapRegion* heap_region_containing(const void* addr) const; | |
| 999 | |
| 1000 // Like the above, but requires "addr" to be in the heap (to avoid a | |
| 1001 // null-check), and unlike the above, may return an continuing humongous | |
| 1002 // region. | |
| 1003 HeapRegion* heap_region_containing_raw(const void* addr) const; | |
| 1004 | |
| 1005 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
| 1006 // each address in the (reserved) heap is a member of exactly | |
| 1007 // one block. The defining characteristic of a block is that it is | |
| 1008 // possible to find its size, and thus to progress forward to the next | |
| 1009 // block. (Blocks may be of different sizes.) Thus, blocks may | |
| 1010 // represent Java objects, or they might be free blocks in a | |
| 1011 // free-list-based heap (or subheap), as long as the two kinds are | |
| 1012 // distinguishable and the size of each is determinable. | |
| 1013 | |
| 1014 // Returns the address of the start of the "block" that contains the | |
| 1015 // address "addr". We say "blocks" instead of "object" since some heaps | |
| 1016 // may not pack objects densely; a chunk may either be an object or a | |
| 1017 // non-object. | |
| 1018 virtual HeapWord* block_start(const void* addr) const; | |
| 1019 | |
| 1020 // Requires "addr" to be the start of a chunk, and returns its size. | |
| 1021 // "addr + size" is required to be the start of a new chunk, or the end | |
| 1022 // of the active area of the heap. | |
| 1023 virtual size_t block_size(const HeapWord* addr) const; | |
| 1024 | |
| 1025 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
| 1026 // the block is an object. | |
| 1027 virtual bool block_is_obj(const HeapWord* addr) const; | |
| 1028 | |
| 1029 // Does this heap support heap inspection? (+PrintClassHistogram) | |
| 1030 virtual bool supports_heap_inspection() const { return true; } | |
| 1031 | |
| 1032 // Section on thread-local allocation buffers (TLABs) | |
| 1033 // See CollectedHeap for semantics. | |
| 1034 | |
| 1035 virtual bool supports_tlab_allocation() const; | |
| 1036 virtual size_t tlab_capacity(Thread* thr) const; | |
| 1037 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
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1038 virtual HeapWord* allocate_new_tlab(size_t word_size); |
| 342 | 1039 |
| 1040 // Can a compiler initialize a new object without store barriers? | |
| 1041 // This permission only extends from the creation of a new object | |
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1042 // via a TLAB up to the first subsequent safepoint. If such permission |
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1043 // is granted for this heap type, the compiler promises to call |
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1044 // defer_store_barrier() below on any slow path allocation of |
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1045 // a new object for which such initializing store barriers will |
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1046 // have been elided. G1, like CMS, allows this, but should be |
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1047 // ready to provide a compensating write barrier as necessary |
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1048 // if that storage came out of a non-young region. The efficiency |
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1049 // of this implementation depends crucially on being able to |
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1050 // answer very efficiently in constant time whether a piece of |
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1051 // storage in the heap comes from a young region or not. |
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1052 // See ReduceInitialCardMarks. |
| 342 | 1053 virtual bool can_elide_tlab_store_barriers() const { |
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1054 // 6920090: Temporarily disabled, because of lingering |
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1055 // instabilities related to RICM with G1. In the |
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1056 // interim, the option ReduceInitialCardMarksForG1 |
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1057 // below is left solely as a debugging device at least |
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1058 // until 6920109 fixes the instabilities. |
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1059 return ReduceInitialCardMarksForG1; |
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1060 } |
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1061 |
| 1166 | 1062 virtual bool card_mark_must_follow_store() const { |
| 1063 return true; | |
| 1064 } | |
| 1065 | |
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1066 bool is_in_young(oop obj) { |
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1067 HeapRegion* hr = heap_region_containing(obj); |
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1068 return hr != NULL && hr->is_young(); |
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1069 } |
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1070 |
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1071 // We don't need barriers for initializing stores to objects |
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1072 // in the young gen: for the SATB pre-barrier, there is no |
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1073 // pre-value that needs to be remembered; for the remembered-set |
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1074 // update logging post-barrier, we don't maintain remembered set |
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1075 // information for young gen objects. Note that non-generational |
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1076 // G1 does not have any "young" objects, should not elide |
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1077 // the rs logging barrier and so should always answer false below. |
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1078 // However, non-generational G1 (-XX:-G1Gen) appears to have |
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1079 // bit-rotted so was not tested below. |
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1080 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
|
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1081 // Re 6920090, 6920109 above. |
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1082 assert(ReduceInitialCardMarksForG1, "Else cannot be here"); |
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1083 assert(G1Gen || !is_in_young(new_obj), |
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1084 "Non-generational G1 should never return true below"); |
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1085 return is_in_young(new_obj); |
| 342 | 1086 } |
| 1087 | |
| 1088 // Can a compiler elide a store barrier when it writes | |
| 1089 // a permanent oop into the heap? Applies when the compiler | |
| 1090 // is storing x to the heap, where x->is_perm() is true. | |
| 1091 virtual bool can_elide_permanent_oop_store_barriers() const { | |
| 1092 // At least until perm gen collection is also G1-ified, at | |
| 1093 // which point this should return false. | |
| 1094 return true; | |
| 1095 } | |
| 1096 | |
| 1097 virtual bool allocs_are_zero_filled(); | |
| 1098 | |
| 1099 // The boundary between a "large" and "small" array of primitives, in | |
| 1100 // words. | |
| 1101 virtual size_t large_typearray_limit(); | |
| 1102 | |
| 1103 // Returns "true" iff the given word_size is "very large". | |
| 1104 static bool isHumongous(size_t word_size) { | |
|
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1105 // Note this has to be strictly greater-than as the TLABs |
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1106 // are capped at the humongous thresold and we want to |
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1107 // ensure that we don't try to allocate a TLAB as |
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1108 // humongous and that we don't allocate a humongous |
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1109 // object in a TLAB. |
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1110 return word_size > _humongous_object_threshold_in_words; |
| 342 | 1111 } |
| 1112 | |
| 1113 // Update mod union table with the set of dirty cards. | |
| 1114 void updateModUnion(); | |
| 1115 | |
| 1116 // Set the mod union bits corresponding to the given memRegion. Note | |
| 1117 // that this is always a safe operation, since it doesn't clear any | |
| 1118 // bits. | |
| 1119 void markModUnionRange(MemRegion mr); | |
| 1120 | |
| 1121 // Records the fact that a marking phase is no longer in progress. | |
| 1122 void set_marking_complete() { | |
| 1123 _mark_in_progress = false; | |
| 1124 } | |
| 1125 void set_marking_started() { | |
| 1126 _mark_in_progress = true; | |
| 1127 } | |
| 1128 bool mark_in_progress() { | |
| 1129 return _mark_in_progress; | |
| 1130 } | |
| 1131 | |
| 1132 // Print the maximum heap capacity. | |
| 1133 virtual size_t max_capacity() const; | |
| 1134 | |
| 1135 virtual jlong millis_since_last_gc(); | |
| 1136 | |
| 1137 // Perform any cleanup actions necessary before allowing a verification. | |
| 1138 virtual void prepare_for_verify(); | |
| 1139 | |
| 1140 // Perform verification. | |
| 811 | 1141 |
| 1142 // use_prev_marking == true -> use "prev" marking information, | |
| 1143 // use_prev_marking == false -> use "next" marking information | |
| 1144 // NOTE: Only the "prev" marking information is guaranteed to be | |
| 1145 // consistent most of the time, so most calls to this should use | |
| 1146 // use_prev_marking == true. Currently, there is only one case where | |
| 1147 // this is called with use_prev_marking == false, which is to verify | |
| 1148 // the "next" marking information at the end of remark. | |
| 1149 void verify(bool allow_dirty, bool silent, bool use_prev_marking); | |
| 1150 | |
| 1151 // Override; it uses the "prev" marking information | |
| 342 | 1152 virtual void verify(bool allow_dirty, bool silent); |
|
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1153 // Default behavior by calling print(tty); |
| 342 | 1154 virtual void print() const; |
|
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1155 // This calls print_on(st, PrintHeapAtGCExtended). |
| 342 | 1156 virtual void print_on(outputStream* st) const; |
|
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1157 // If extended is true, it will print out information for all |
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1158 // regions in the heap by calling print_on_extended(st). |
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1159 virtual void print_on(outputStream* st, bool extended) const; |
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1160 virtual void print_on_extended(outputStream* st) const; |
| 342 | 1161 |
| 1162 virtual void print_gc_threads_on(outputStream* st) const; | |
| 1163 virtual void gc_threads_do(ThreadClosure* tc) const; | |
| 1164 | |
| 1165 // Override | |
| 1166 void print_tracing_info() const; | |
| 1167 | |
| 1168 // If "addr" is a pointer into the (reserved?) heap, returns a positive | |
| 1169 // number indicating the "arena" within the heap in which "addr" falls. | |
| 1170 // Or else returns 0. | |
| 1171 virtual int addr_to_arena_id(void* addr) const; | |
| 1172 | |
| 1173 // Convenience function to be used in situations where the heap type can be | |
| 1174 // asserted to be this type. | |
| 1175 static G1CollectedHeap* heap(); | |
| 1176 | |
| 1177 void empty_young_list(); | |
| 1178 bool should_set_young_locked(); | |
| 1179 | |
| 1180 void set_region_short_lived_locked(HeapRegion* hr); | |
| 1181 // add appropriate methods for any other surv rate groups | |
| 1182 | |
|
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1183 YoungList* young_list() { return _young_list; } |
| 342 | 1184 |
| 1185 // debugging | |
| 1186 bool check_young_list_well_formed() { | |
| 1187 return _young_list->check_list_well_formed(); | |
| 1188 } | |
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1189 |
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1190 bool check_young_list_empty(bool check_heap, |
| 342 | 1191 bool check_sample = true); |
| 1192 | |
| 1193 // *** Stuff related to concurrent marking. It's not clear to me that so | |
| 1194 // many of these need to be public. | |
| 1195 | |
| 1196 // The functions below are helper functions that a subclass of | |
| 1197 // "CollectedHeap" can use in the implementation of its virtual | |
| 1198 // functions. | |
| 1199 // This performs a concurrent marking of the live objects in a | |
| 1200 // bitmap off to the side. | |
| 1201 void doConcurrentMark(); | |
| 1202 | |
| 1203 // This is called from the marksweep collector which then does | |
| 1204 // a concurrent mark and verifies that the results agree with | |
| 1205 // the stop the world marking. | |
| 1206 void checkConcurrentMark(); | |
| 1207 void do_sync_mark(); | |
| 1208 | |
| 1209 bool isMarkedPrev(oop obj) const; | |
| 1210 bool isMarkedNext(oop obj) const; | |
| 1211 | |
| 811 | 1212 // use_prev_marking == true -> use "prev" marking information, |
| 1213 // use_prev_marking == false -> use "next" marking information | |
| 1214 bool is_obj_dead_cond(const oop obj, | |
| 1215 const HeapRegion* hr, | |
| 1216 const bool use_prev_marking) const { | |
| 1217 if (use_prev_marking) { | |
| 1218 return is_obj_dead(obj, hr); | |
| 1219 } else { | |
| 1220 return is_obj_ill(obj, hr); | |
| 1221 } | |
| 1222 } | |
| 1223 | |
| 342 | 1224 // Determine if an object is dead, given the object and also |
| 1225 // the region to which the object belongs. An object is dead | |
| 1226 // iff a) it was not allocated since the last mark and b) it | |
| 1227 // is not marked. | |
| 1228 | |
| 1229 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
| 1230 return | |
| 1231 !hr->obj_allocated_since_prev_marking(obj) && | |
| 1232 !isMarkedPrev(obj); | |
| 1233 } | |
| 1234 | |
| 1235 // This is used when copying an object to survivor space. | |
| 1236 // If the object is marked live, then we mark the copy live. | |
| 1237 // If the object is allocated since the start of this mark | |
| 1238 // cycle, then we mark the copy live. | |
| 1239 // If the object has been around since the previous mark | |
| 1240 // phase, and hasn't been marked yet during this phase, | |
| 1241 // then we don't mark it, we just wait for the | |
| 1242 // current marking cycle to get to it. | |
| 1243 | |
| 1244 // This function returns true when an object has been | |
| 1245 // around since the previous marking and hasn't yet | |
| 1246 // been marked during this marking. | |
| 1247 | |
| 1248 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
| 1249 return | |
| 1250 !hr->obj_allocated_since_next_marking(obj) && | |
| 1251 !isMarkedNext(obj); | |
| 1252 } | |
| 1253 | |
| 1254 // Determine if an object is dead, given only the object itself. | |
| 1255 // This will find the region to which the object belongs and | |
| 1256 // then call the region version of the same function. | |
| 1257 | |
| 1258 // Added if it is in permanent gen it isn't dead. | |
| 1259 // Added if it is NULL it isn't dead. | |
| 1260 | |
| 811 | 1261 // use_prev_marking == true -> use "prev" marking information, |
| 1262 // use_prev_marking == false -> use "next" marking information | |
| 1263 bool is_obj_dead_cond(const oop obj, | |
| 1264 const bool use_prev_marking) { | |
| 1265 if (use_prev_marking) { | |
| 1266 return is_obj_dead(obj); | |
| 1267 } else { | |
| 1268 return is_obj_ill(obj); | |
| 1269 } | |
| 1270 } | |
| 1271 | |
| 1272 bool is_obj_dead(const oop obj) { | |
| 1273 const HeapRegion* hr = heap_region_containing(obj); | |
| 342 | 1274 if (hr == NULL) { |
| 1275 if (Universe::heap()->is_in_permanent(obj)) | |
| 1276 return false; | |
| 1277 else if (obj == NULL) return false; | |
| 1278 else return true; | |
| 1279 } | |
| 1280 else return is_obj_dead(obj, hr); | |
| 1281 } | |
| 1282 | |
| 811 | 1283 bool is_obj_ill(const oop obj) { |
| 1284 const HeapRegion* hr = heap_region_containing(obj); | |
| 342 | 1285 if (hr == NULL) { |
| 1286 if (Universe::heap()->is_in_permanent(obj)) | |
| 1287 return false; | |
| 1288 else if (obj == NULL) return false; | |
| 1289 else return true; | |
| 1290 } | |
| 1291 else return is_obj_ill(obj, hr); | |
| 1292 } | |
| 1293 | |
| 1294 // The following is just to alert the verification code | |
| 1295 // that a full collection has occurred and that the | |
| 1296 // remembered sets are no longer up to date. | |
| 1297 bool _full_collection; | |
| 1298 void set_full_collection() { _full_collection = true;} | |
| 1299 void clear_full_collection() {_full_collection = false;} | |
| 1300 bool full_collection() {return _full_collection;} | |
| 1301 | |
| 1302 ConcurrentMark* concurrent_mark() const { return _cm; } | |
| 1303 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
| 1304 | |
|
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1305 // The dirty cards region list is used to record a subset of regions |
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1306 // whose cards need clearing. The list if populated during the |
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1307 // remembered set scanning and drained during the card table |
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1308 // cleanup. Although the methods are reentrant, population/draining |
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1309 // phases must not overlap. For synchronization purposes the last |
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1310 // element on the list points to itself. |
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1311 HeapRegion* _dirty_cards_region_list; |
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1312 void push_dirty_cards_region(HeapRegion* hr); |
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1313 HeapRegion* pop_dirty_cards_region(); |
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1314 |
| 342 | 1315 public: |
| 1316 void stop_conc_gc_threads(); | |
| 1317 | |
| 1318 // <NEW PREDICTION> | |
| 1319 | |
| 1320 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
| 1321 void check_if_region_is_too_expensive(double predicted_time_ms); | |
| 1322 size_t pending_card_num(); | |
| 1323 size_t max_pending_card_num(); | |
| 1324 size_t cards_scanned(); | |
| 1325 | |
| 1326 // </NEW PREDICTION> | |
| 1327 | |
| 1328 protected: | |
| 1329 size_t _max_heap_capacity; | |
| 1330 | |
| 1331 // debug_only(static void check_for_valid_allocation_state();) | |
| 1332 | |
| 1333 public: | |
| 1334 // Temporary: call to mark things unimplemented for the G1 heap (e.g., | |
| 1335 // MemoryService). In productization, we can make this assert false | |
| 1336 // to catch such places (as well as searching for calls to this...) | |
| 1337 static void g1_unimplemented(); | |
| 1338 | |
| 1339 }; | |
| 1340 | |
|
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1341 #define use_local_bitmaps 1 |
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1342 #define verify_local_bitmaps 0 |
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1343 #define oop_buffer_length 256 |
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1344 |
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1345 #ifndef PRODUCT |
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1346 class GCLabBitMap; |
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1347 class GCLabBitMapClosure: public BitMapClosure { |
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1348 private: |
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1349 ConcurrentMark* _cm; |
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1350 GCLabBitMap* _bitmap; |
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1351 |
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1352 public: |
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1353 GCLabBitMapClosure(ConcurrentMark* cm, |
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1354 GCLabBitMap* bitmap) { |
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1355 _cm = cm; |
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1356 _bitmap = bitmap; |
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1357 } |
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|
1358 |
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1359 virtual bool do_bit(size_t offset); |
|
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|
1360 }; |
|
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diff
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|
1361 #endif // !PRODUCT |
|
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|
1362 |
|
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|
1363 class GCLabBitMap: public BitMap { |
|
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|
1364 private: |
|
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|
1365 ConcurrentMark* _cm; |
|
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|
1366 |
|
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|
1367 int _shifter; |
|
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1368 size_t _bitmap_word_covers_words; |
|
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1369 |
|
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|
1370 // beginning of the heap |
|
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|
1371 HeapWord* _heap_start; |
|
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1372 |
|
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|
1373 // this is the actual start of the GCLab |
|
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|
1374 HeapWord* _real_start_word; |
|
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1375 |
|
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|
1376 // this is the actual end of the GCLab |
|
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1377 HeapWord* _real_end_word; |
|
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1378 |
|
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1379 // this is the first word, possibly located before the actual start |
|
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1380 // of the GCLab, that corresponds to the first bit of the bitmap |
|
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1381 HeapWord* _start_word; |
|
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1382 |
|
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1383 // size of a GCLab in words |
|
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1384 size_t _gclab_word_size; |
|
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1385 |
|
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|
1386 static int shifter() { |
|
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|
1387 return MinObjAlignment - 1; |
|
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|
1388 } |
|
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|
1389 |
|
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|
1390 // how many heap words does a single bitmap word corresponds to? |
|
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1391 static size_t bitmap_word_covers_words() { |
|
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|
1392 return BitsPerWord << shifter(); |
|
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|
1393 } |
|
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|
1394 |
|
1391
79e419e5ea3b
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parents:
1313
diff
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|
1395 size_t gclab_word_size() const { |
|
79e419e5ea3b
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1313
diff
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|
1396 return _gclab_word_size; |
|
845
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1397 } |
|
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|
1398 |
|
1391
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apetrusenko
parents:
1313
diff
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|
1399 // Calculates actual GCLab size in words |
|
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parents:
1313
diff
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|
1400 size_t gclab_real_word_size() const { |
|
79e419e5ea3b
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1313
diff
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|
1401 return bitmap_size_in_bits(pointer_delta(_real_end_word, _start_word)) |
|
79e419e5ea3b
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parents:
1313
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|
1402 / BitsPerWord; |
|
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1313
diff
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|
1403 } |
|
79e419e5ea3b
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parents:
1313
diff
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|
1404 |
|
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1313
diff
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|
1405 static size_t bitmap_size_in_bits(size_t gclab_word_size) { |
|
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1313
diff
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|
1406 size_t bits_in_bitmap = gclab_word_size >> shifter(); |
|
845
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|
1407 // We are going to ensure that the beginning of a word in this |
|
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|
1408 // bitmap also corresponds to the beginning of a word in the |
|
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|
1409 // global marking bitmap. To handle the case where a GCLab |
|
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|
1410 // starts from the middle of the bitmap, we need to add enough |
|
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diff
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|
1411 // space (i.e. up to a bitmap word) to ensure that we have |
|
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|
1412 // enough bits in the bitmap. |
|
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|
1413 return bits_in_bitmap + BitsPerWord - 1; |
|
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diff
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|
1414 } |
|
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diff
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|
1415 public: |
|
1391
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6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1416 GCLabBitMap(HeapWord* heap_start, size_t gclab_word_size) |
|
79e419e5ea3b
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1313
diff
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|
1417 : BitMap(bitmap_size_in_bits(gclab_word_size)), |
|
845
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parents:
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diff
changeset
|
1418 _cm(G1CollectedHeap::heap()->concurrent_mark()), |
|
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|
1419 _shifter(shifter()), |
|
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|
1420 _bitmap_word_covers_words(bitmap_word_covers_words()), |
|
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|
1421 _heap_start(heap_start), |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1422 _gclab_word_size(gclab_word_size), |
|
845
df6caf649ff7
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parents:
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|
1423 _real_start_word(NULL), |
|
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|
1424 _real_end_word(NULL), |
|
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|
1425 _start_word(NULL) |
|
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diff
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|
1426 { |
|
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parents:
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diff
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|
1427 guarantee( size_in_words() >= bitmap_size_in_words(), |
|
df6caf649ff7
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diff
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|
1428 "just making sure"); |
|
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diff
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|
1429 } |
|
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parents:
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diff
changeset
|
1430 |
|
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parents:
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diff
changeset
|
1431 inline unsigned heapWordToOffset(HeapWord* addr) { |
|
df6caf649ff7
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parents:
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diff
changeset
|
1432 unsigned offset = (unsigned) pointer_delta(addr, _start_word) >> _shifter; |
|
df6caf649ff7
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parents:
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diff
changeset
|
1433 assert(offset < size(), "offset should be within bounds"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1434 return offset; |
|
df6caf649ff7
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parents:
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diff
changeset
|
1435 } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1436 |
|
df6caf649ff7
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parents:
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diff
changeset
|
1437 inline HeapWord* offsetToHeapWord(size_t offset) { |
|
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parents:
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diff
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|
1438 HeapWord* addr = _start_word + (offset << _shifter); |
|
df6caf649ff7
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parents:
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|
1439 assert(_real_start_word <= addr && addr < _real_end_word, "invariant"); |
|
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parents:
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|
1440 return addr; |
|
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parents:
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diff
changeset
|
1441 } |
|
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parents:
838
diff
changeset
|
1442 |
|
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parents:
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diff
changeset
|
1443 bool fields_well_formed() { |
|
df6caf649ff7
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parents:
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diff
changeset
|
1444 bool ret1 = (_real_start_word == NULL) && |
|
df6caf649ff7
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parents:
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diff
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|
1445 (_real_end_word == NULL) && |
|
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parents:
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diff
changeset
|
1446 (_start_word == NULL); |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1447 if (ret1) |
|
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parents:
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changeset
|
1448 return true; |
|
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parents:
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diff
changeset
|
1449 |
|
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parents:
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changeset
|
1450 bool ret2 = _real_start_word >= _start_word && |
|
df6caf649ff7
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|
1451 _start_word < _real_end_word && |
|
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parents:
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diff
changeset
|
1452 (_real_start_word + _gclab_word_size) == _real_end_word && |
|
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parents:
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diff
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|
1453 (_start_word + _gclab_word_size + _bitmap_word_covers_words) |
|
df6caf649ff7
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|
1454 > _real_end_word; |
|
df6caf649ff7
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parents:
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diff
changeset
|
1455 return ret2; |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1456 } |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1457 |
|
df6caf649ff7
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parents:
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diff
changeset
|
1458 inline bool mark(HeapWord* addr) { |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1459 guarantee(use_local_bitmaps, "invariant"); |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1460 assert(fields_well_formed(), "invariant"); |
|
df6caf649ff7
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ysr
parents:
838
diff
changeset
|
1461 |
|
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parents:
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diff
changeset
|
1462 if (addr >= _real_start_word && addr < _real_end_word) { |
|
df6caf649ff7
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parents:
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changeset
|
1463 assert(!isMarked(addr), "should not have already been marked"); |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1464 |
|
df6caf649ff7
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parents:
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diff
changeset
|
1465 // first mark it on the bitmap |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1466 at_put(heapWordToOffset(addr), true); |
|
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parents:
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diff
changeset
|
1467 |
|
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parents:
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diff
changeset
|
1468 return true; |
|
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parents:
838
diff
changeset
|
1469 } else { |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1470 return false; |
|
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parents:
838
diff
changeset
|
1471 } |
|
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parents:
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diff
changeset
|
1472 } |
|
df6caf649ff7
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parents:
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diff
changeset
|
1473 |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1474 inline bool isMarked(HeapWord* addr) { |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1475 guarantee(use_local_bitmaps, "invariant"); |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1476 assert(fields_well_formed(), "invariant"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1477 |
|
df6caf649ff7
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|
1478 return at(heapWordToOffset(addr)); |
|
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|
1479 } |
|
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|
1480 |
|
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|
1481 void set_buffer(HeapWord* start) { |
|
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|
1482 guarantee(use_local_bitmaps, "invariant"); |
|
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|
1483 clear(); |
|
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|
1484 |
|
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|
1485 assert(start != NULL, "invariant"); |
|
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|
1486 _real_start_word = start; |
|
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|
1487 _real_end_word = start + _gclab_word_size; |
|
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|
1488 |
|
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|
1489 size_t diff = |
|
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|
1490 pointer_delta(start, _heap_start) % _bitmap_word_covers_words; |
|
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|
1491 _start_word = start - diff; |
|
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|
1492 |
|
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|
1493 assert(fields_well_formed(), "invariant"); |
|
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|
1494 } |
|
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|
1495 |
|
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|
1496 #ifndef PRODUCT |
|
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|
1497 void verify() { |
|
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|
1498 // verify that the marks have been propagated |
|
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|
1499 GCLabBitMapClosure cl(_cm, this); |
|
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|
1500 iterate(&cl); |
|
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|
1501 } |
|
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|
1502 #endif // PRODUCT |
|
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|
1503 |
|
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|
1504 void retire() { |
|
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|
1505 guarantee(use_local_bitmaps, "invariant"); |
|
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|
1506 assert(fields_well_formed(), "invariant"); |
|
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|
1507 |
|
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|
1508 if (_start_word != NULL) { |
|
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|
1509 CMBitMap* mark_bitmap = _cm->nextMarkBitMap(); |
|
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|
1510 |
|
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|
1511 // this means that the bitmap was set up for the GCLab |
|
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|
1512 assert(_real_start_word != NULL && _real_end_word != NULL, "invariant"); |
|
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|
1513 |
|
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|
1514 mark_bitmap->mostly_disjoint_range_union(this, |
|
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|
1515 0, // always start from the start of the bitmap |
|
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|
1516 _start_word, |
|
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|
1517 gclab_real_word_size()); |
|
845
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|
1518 _cm->grayRegionIfNecessary(MemRegion(_real_start_word, _real_end_word)); |
|
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|
1519 |
|
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|
1520 #ifndef PRODUCT |
|
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|
1521 if (use_local_bitmaps && verify_local_bitmaps) |
|
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|
1522 verify(); |
|
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|
1523 #endif // PRODUCT |
|
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|
1524 } else { |
|
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|
1525 assert(_real_start_word == NULL && _real_end_word == NULL, "invariant"); |
|
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|
1526 } |
|
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|
1527 } |
|
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|
1528 |
|
1391
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|
1529 size_t bitmap_size_in_words() const { |
|
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|
1530 return (bitmap_size_in_bits(gclab_word_size()) + BitsPerWord - 1) / BitsPerWord; |
|
845
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|
1531 } |
|
1391
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|
1532 |
|
845
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|
1533 }; |
|
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|
1534 |
|
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|
1535 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
|
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|
1536 private: |
|
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|
1537 bool _retired; |
|
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|
1538 bool _during_marking; |
|
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|
1539 GCLabBitMap _bitmap; |
|
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|
1540 |
|
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diff
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|
1541 public: |
|
1391
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|
1542 G1ParGCAllocBuffer(size_t gclab_word_size) : |
|
79e419e5ea3b
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|
1543 ParGCAllocBuffer(gclab_word_size), |
|
845
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diff
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|
1544 _during_marking(G1CollectedHeap::heap()->mark_in_progress()), |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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|
1545 _bitmap(G1CollectedHeap::heap()->reserved_region().start(), gclab_word_size), |
|
845
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parents:
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diff
changeset
|
1546 _retired(false) |
|
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diff
changeset
|
1547 { } |
|
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diff
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|
1548 |
|
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diff
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|
1549 inline bool mark(HeapWord* addr) { |
|
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
1550 guarantee(use_local_bitmaps, "invariant"); |
|
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parents:
838
diff
changeset
|
1551 assert(_during_marking, "invariant"); |
|
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parents:
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diff
changeset
|
1552 return _bitmap.mark(addr); |
|
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parents:
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diff
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|
1553 } |
|
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parents:
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diff
changeset
|
1554 |
|
df6caf649ff7
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parents:
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diff
changeset
|
1555 inline void set_buf(HeapWord* buf) { |
|
df6caf649ff7
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diff
changeset
|
1556 if (use_local_bitmaps && _during_marking) |
|
df6caf649ff7
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parents:
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diff
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|
1557 _bitmap.set_buffer(buf); |
|
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parents:
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diff
changeset
|
1558 ParGCAllocBuffer::set_buf(buf); |
|
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parents:
838
diff
changeset
|
1559 _retired = false; |
|
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parents:
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diff
changeset
|
1560 } |
|
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parents:
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diff
changeset
|
1561 |
|
df6caf649ff7
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parents:
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diff
changeset
|
1562 inline void retire(bool end_of_gc, bool retain) { |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1563 if (_retired) |
|
df6caf649ff7
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parents:
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diff
changeset
|
1564 return; |
|
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diff
changeset
|
1565 if (use_local_bitmaps && _during_marking) { |
|
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838
diff
changeset
|
1566 _bitmap.retire(); |
|
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parents:
838
diff
changeset
|
1567 } |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1568 ParGCAllocBuffer::retire(end_of_gc, retain); |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1569 _retired = true; |
|
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parents:
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diff
changeset
|
1570 } |
|
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parents:
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diff
changeset
|
1571 }; |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1572 |
|
df6caf649ff7
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parents:
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diff
changeset
|
1573 class G1ParScanThreadState : public StackObj { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1574 protected: |
|
df6caf649ff7
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parents:
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diff
changeset
|
1575 G1CollectedHeap* _g1h; |
|
df6caf649ff7
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parents:
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diff
changeset
|
1576 RefToScanQueue* _refs; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1577 DirtyCardQueue _dcq; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1578 CardTableModRefBS* _ct_bs; |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1579 G1RemSet* _g1_rem; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1580 |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1581 G1ParGCAllocBuffer _surviving_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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parents:
1313
diff
changeset
|
1582 G1ParGCAllocBuffer _tenured_alloc_buffer; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1583 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount]; |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
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diff
changeset
|
1584 ageTable _age_table; |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
838
diff
changeset
|
1585 |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1586 size_t _alloc_buffer_waste; |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1587 size_t _undo_waste; |
|
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parents:
838
diff
changeset
|
1588 |
|
df6caf649ff7
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parents:
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diff
changeset
|
1589 OopsInHeapRegionClosure* _evac_failure_cl; |
|
df6caf649ff7
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parents:
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diff
changeset
|
1590 G1ParScanHeapEvacClosure* _evac_cl; |
|
df6caf649ff7
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parents:
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diff
changeset
|
1591 G1ParScanPartialArrayClosure* _partial_scan_cl; |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1592 |
|
df6caf649ff7
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parents:
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diff
changeset
|
1593 int _hash_seed; |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1594 int _queue_num; |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1595 |
| 1611 | 1596 size_t _term_attempts; |
|
845
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parents:
838
diff
changeset
|
1597 |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1598 double _start; |
|
df6caf649ff7
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parents:
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diff
changeset
|
1599 double _start_strong_roots; |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1600 double _strong_roots_time; |
|
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|
1601 double _start_term; |
|
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parents:
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diff
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|
1602 double _term_time; |
|
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|
1603 |
|
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|
1604 // Map from young-age-index (0 == not young, 1 is youngest) to |
|
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|
1605 // surviving words. base is what we get back from the malloc call |
|
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|
1606 size_t* _surviving_young_words_base; |
|
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diff
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|
1607 // this points into the array, as we use the first few entries for padding |
|
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diff
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|
1608 size_t* _surviving_young_words; |
|
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diff
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|
1609 |
| 1709 | 1610 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t)) |
|
845
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|
1611 |
|
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|
1612 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
|
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|
1613 |
|
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diff
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|
1614 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
|
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|
1615 |
|
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|
1616 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
|
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|
1617 CardTableModRefBS* ctbs() { return _ct_bs; } |
|
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|
1618 |
|
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|
1619 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
|
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|
1620 if (!from->is_survivor()) { |
|
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|
1621 _g1_rem->par_write_ref(from, p, tid); |
|
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|
1622 } |
|
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|
1623 } |
|
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|
1624 |
|
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|
1625 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
|
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|
1626 // If the new value of the field points to the same region or |
|
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|
1627 // is the to-space, we don't need to include it in the Rset updates. |
|
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|
1628 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
|
df6caf649ff7
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|
1629 size_t card_index = ctbs()->index_for(p); |
|
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|
1630 // If the card hasn't been added to the buffer, do it. |
|
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|
1631 if (ctbs()->mark_card_deferred(card_index)) { |
|
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|
1632 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
|
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|
1633 } |
|
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|
1634 } |
|
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|
1635 } |
|
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parents:
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|
1636 |
|
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parents:
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|
1637 public: |
|
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|
1638 G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num); |
|
df6caf649ff7
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|
1639 |
|
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|
1640 ~G1ParScanThreadState() { |
|
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|
1641 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base); |
|
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|
1642 } |
|
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|
1643 |
|
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|
1644 RefToScanQueue* refs() { return _refs; } |
|
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parents:
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|
1645 ageTable* age_table() { return &_age_table; } |
|
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parents:
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diff
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|
1646 |
|
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changeset
|
1647 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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|
1648 return _alloc_buffers[purpose]; |
|
845
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parents:
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diff
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|
1649 } |
|
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|
1650 |
| 1709 | 1651 size_t alloc_buffer_waste() const { return _alloc_buffer_waste; } |
| 1652 size_t undo_waste() const { return _undo_waste; } | |
|
845
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parents:
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|
1653 |
|
df6caf649ff7
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|
1654 template <class T> void push_on_queue(T* ref) { |
|
df6caf649ff7
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parents:
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|
1655 assert(ref != NULL, "invariant"); |
|
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parents:
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diff
changeset
|
1656 assert(has_partial_array_mask(ref) || |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1194
diff
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|
1657 _g1h->is_in_g1_reserved(oopDesc::load_decode_heap_oop(ref)), "invariant"); |
|
845
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parents:
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|
1658 #ifdef ASSERT |
|
df6caf649ff7
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|
1659 if (has_partial_array_mask(ref)) { |
|
df6caf649ff7
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changeset
|
1660 oop p = clear_partial_array_mask(ref); |
|
df6caf649ff7
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diff
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|
1661 // Verify that we point into the CS |
|
df6caf649ff7
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parents:
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diff
changeset
|
1662 assert(_g1h->obj_in_cs(p), "Should be in CS"); |
|
df6caf649ff7
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parents:
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|
1663 } |
|
df6caf649ff7
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diff
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|
1664 #endif |
| 1709 | 1665 refs()->push(ref); |
|
845
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parents:
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diff
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|
1666 } |
|
df6caf649ff7
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parents:
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diff
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|
1667 |
|
df6caf649ff7
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parents:
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diff
changeset
|
1668 void pop_from_queue(StarTask& ref) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1669 if (refs()->pop_local(ref)) { |
|
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6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1670 assert((oop*)ref != NULL, "pop_local() returned true"); |
|
df6caf649ff7
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parents:
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changeset
|
1671 assert(UseCompressedOops || !ref.is_narrow(), "Error"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1672 assert(has_partial_array_mask((oop*)ref) || |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1194
diff
changeset
|
1673 _g1h->is_in_g1_reserved(ref.is_narrow() ? oopDesc::load_decode_heap_oop((narrowOop*)ref) |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
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diff
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|
1674 : oopDesc::load_decode_heap_oop((oop*)ref)), |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
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1194
diff
changeset
|
1675 "invariant"); |
|
845
df6caf649ff7
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parents:
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diff
changeset
|
1676 } else { |
|
df6caf649ff7
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parents:
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diff
changeset
|
1677 StarTask null_task; |
|
df6caf649ff7
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parents:
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diff
changeset
|
1678 ref = null_task; |
|
df6caf649ff7
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parents:
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diff
changeset
|
1679 } |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1680 } |
|
df6caf649ff7
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parents:
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diff
changeset
|
1681 |
|
df6caf649ff7
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parents:
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diff
changeset
|
1682 void pop_from_overflow_queue(StarTask& ref) { |
| 1709 | 1683 StarTask new_ref; |
| 1684 refs()->pop_overflow(new_ref); | |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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changeset
|
1685 assert((oop*)new_ref != NULL, "pop() from a local non-empty stack"); |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1686 assert(UseCompressedOops || !new_ref.is_narrow(), "Error"); |
|
df6caf649ff7
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parents:
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diff
changeset
|
1687 assert(has_partial_array_mask((oop*)new_ref) || |
|
1261
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1194
diff
changeset
|
1688 _g1h->is_in_g1_reserved(new_ref.is_narrow() ? oopDesc::load_decode_heap_oop((narrowOop*)new_ref) |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1194
diff
changeset
|
1689 : oopDesc::load_decode_heap_oop((oop*)new_ref)), |
|
0414c1049f15
6923991: G1: improve scalability of RSet scanning
iveresov
parents:
1194
diff
changeset
|
1690 "invariant"); |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
838
diff
changeset
|
1691 ref = new_ref; |
|
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parents:
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diff
changeset
|
1692 } |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1693 |
|
1836
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1833
diff
changeset
|
1694 int refs_to_scan() { return (int)refs()->size(); } |
|
894b1d7c7e01
6423256: GC stacks should use a better data structure
jcoomes
parents:
1833
diff
changeset
|
1695 int overflowed_refs_to_scan() { return (int)refs()->overflow_stack()->size(); } |
|
845
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1696 |
|
df6caf649ff7
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parents:
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diff
changeset
|
1697 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
|
df6caf649ff7
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parents:
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|
1698 if (G1DeferredRSUpdate) { |
|
df6caf649ff7
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parents:
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diff
changeset
|
1699 deferred_rs_update(from, p, tid); |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1700 } else { |
|
df6caf649ff7
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parents:
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diff
changeset
|
1701 immediate_rs_update(from, p, tid); |
|
df6caf649ff7
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parents:
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diff
changeset
|
1702 } |
|
df6caf649ff7
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parents:
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diff
changeset
|
1703 } |
|
df6caf649ff7
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parents:
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|
1704 |
|
df6caf649ff7
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parents:
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|
1705 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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|
1706 |
|
df6caf649ff7
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parents:
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diff
changeset
|
1707 HeapWord* obj = NULL; |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1708 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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parents:
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diff
changeset
|
1709 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
|
845
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parents:
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|
1710 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
|
1391
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6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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parents:
1313
diff
changeset
|
1711 assert(gclab_word_size == alloc_buf->word_sz(), |
|
79e419e5ea3b
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1313
diff
changeset
|
1712 "dynamic resizing is not supported"); |
|
845
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parents:
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changeset
|
1713 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
|
df6caf649ff7
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parents:
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changeset
|
1714 alloc_buf->retire(false, false); |
|
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parents:
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changeset
|
1715 |
|
1391
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apetrusenko
parents:
1313
diff
changeset
|
1716 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
|
845
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parents:
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changeset
|
1717 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
|
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parents:
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|
1718 // Otherwise. |
|
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parents:
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changeset
|
1719 alloc_buf->set_buf(buf); |
|
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parents:
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changeset
|
1720 |
|
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1721 obj = alloc_buf->allocate(word_sz); |
|
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1722 assert(obj != NULL, "buffer was definitely big enough..."); |
|
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|
1723 } else { |
|
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|
1724 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
|
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|
1725 } |
|
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|
1726 return obj; |
|
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|
1727 } |
|
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|
1728 |
|
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|
1729 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
|
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1730 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
|
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1731 if (obj != NULL) return obj; |
|
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1732 return allocate_slow(purpose, word_sz); |
|
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|
1733 } |
|
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|
1734 |
|
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|
1735 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
|
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1736 if (alloc_buffer(purpose)->contains(obj)) { |
|
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|
1737 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
|
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|
1738 "should contain whole object"); |
|
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|
1739 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
|
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1740 } else { |
|
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|
1741 CollectedHeap::fill_with_object(obj, word_sz); |
|
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|
1742 add_to_undo_waste(word_sz); |
|
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|
1743 } |
|
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|
1744 } |
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1745 |
|
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|
1746 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
|
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1747 _evac_failure_cl = evac_failure_cl; |
|
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1748 } |
|
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|
1749 OopsInHeapRegionClosure* evac_failure_closure() { |
|
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1750 return _evac_failure_cl; |
|
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1751 } |
|
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1752 |
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|
1753 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
|
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1754 _evac_cl = evac_cl; |
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1755 } |
|
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1756 |
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1757 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
|
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1758 _partial_scan_cl = partial_scan_cl; |
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1759 } |
|
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1760 |
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|
1761 int* hash_seed() { return &_hash_seed; } |
|
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1762 int queue_num() { return _queue_num; } |
|
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1763 |
| 1709 | 1764 size_t term_attempts() const { return _term_attempts; } |
| 1611 | 1765 void note_term_attempt() { _term_attempts++; } |
|
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1766 |
|
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1767 void start_strong_roots() { |
|
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1768 _start_strong_roots = os::elapsedTime(); |
|
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1769 } |
|
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1770 void end_strong_roots() { |
|
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1771 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
|
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1772 } |
| 1709 | 1773 double strong_roots_time() const { return _strong_roots_time; } |
|
845
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1774 |
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1775 void start_term_time() { |
|
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|
1776 note_term_attempt(); |
|
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1777 _start_term = os::elapsedTime(); |
|
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1778 } |
|
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1779 void end_term_time() { |
|
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1780 _term_time += (os::elapsedTime() - _start_term); |
|
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1781 } |
| 1709 | 1782 double term_time() const { return _term_time; } |
|
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1783 |
| 1709 | 1784 double elapsed_time() const { |
|
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1785 return os::elapsedTime() - _start; |
|
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1786 } |
|
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|
1787 |
| 1709 | 1788 static void |
| 1789 print_termination_stats_hdr(outputStream* const st = gclog_or_tty); | |
| 1790 void | |
| 1791 print_termination_stats(int i, outputStream* const st = gclog_or_tty) const; | |
| 1792 | |
|
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1793 size_t* surviving_young_words() { |
|
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|
1794 // We add on to hide entry 0 which accumulates surviving words for |
|
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1795 // age -1 regions (i.e. non-young ones) |
|
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1796 return _surviving_young_words; |
|
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|
1797 } |
|
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1798 |
|
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|
1799 void retire_alloc_buffers() { |
|
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|
1800 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
|
1391
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|
1801 size_t waste = _alloc_buffers[ap]->words_remaining(); |
|
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|
1802 add_to_alloc_buffer_waste(waste); |
|
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|
1803 _alloc_buffers[ap]->retire(true, false); |
|
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1804 } |
|
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1805 } |
|
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1806 |
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|
1807 private: |
|
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|
1808 template <class T> void deal_with_reference(T* ref_to_scan) { |
|
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1809 if (has_partial_array_mask(ref_to_scan)) { |
|
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1810 _partial_scan_cl->do_oop_nv(ref_to_scan); |
|
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1811 } else { |
|
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1812 // Note: we can use "raw" versions of "region_containing" because |
|
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1813 // "obj_to_scan" is definitely in the heap, and is not in a |
|
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1814 // humongous region. |
|
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1815 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
|
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1816 _evac_cl->set_region(r); |
|
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1817 _evac_cl->do_oop_nv(ref_to_scan); |
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1818 } |
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1819 } |
|
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1820 |
|
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1821 public: |
|
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1822 void trim_queue() { |
|
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|
1823 // I've replicated the loop twice, first to drain the overflow |
|
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1824 // queue, second to drain the task queue. This is better than |
|
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1825 // having a single loop, which checks both conditions and, inside |
|
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1826 // it, either pops the overflow queue or the task queue, as each |
|
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1827 // loop is tighter. Also, the decision to drain the overflow queue |
|
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1828 // first is not arbitrary, as the overflow queue is not visible |
|
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1829 // to the other workers, whereas the task queue is. So, we want to |
|
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1830 // drain the "invisible" entries first, while allowing the other |
|
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1831 // workers to potentially steal the "visible" entries. |
|
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|
1832 |
|
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|
1833 while (refs_to_scan() > 0 || overflowed_refs_to_scan() > 0) { |
|
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|
1834 while (overflowed_refs_to_scan() > 0) { |
|
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|
1835 StarTask ref_to_scan; |
|
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|
1836 assert((oop*)ref_to_scan == NULL, "Constructed above"); |
|
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|
1837 pop_from_overflow_queue(ref_to_scan); |
|
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|
1838 // We shouldn't have pushed it on the queue if it was not |
|
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|
1839 // pointing into the CSet. |
|
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|
1840 assert((oop*)ref_to_scan != NULL, "Follows from inner loop invariant"); |
|
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|
1841 if (ref_to_scan.is_narrow()) { |
|
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|
1842 assert(UseCompressedOops, "Error"); |
|
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|
1843 narrowOop* p = (narrowOop*)ref_to_scan; |
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|
1844 assert(!has_partial_array_mask(p) && |
|
1261
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6923991: G1: improve scalability of RSet scanning
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1194
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|
1845 _g1h->is_in_g1_reserved(oopDesc::load_decode_heap_oop(p)), "sanity"); |
|
845
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|
1846 deal_with_reference(p); |
|
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1847 } else { |
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1848 oop* p = (oop*)ref_to_scan; |
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1849 assert((has_partial_array_mask(p) && _g1h->is_in_g1_reserved(clear_partial_array_mask(p))) || |
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1850 _g1h->is_in_g1_reserved(oopDesc::load_decode_heap_oop(p)), "sanity"); |
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1851 deal_with_reference(p); |
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1852 } |
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1853 } |
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1854 |
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1855 while (refs_to_scan() > 0) { |
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1856 StarTask ref_to_scan; |
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1857 assert((oop*)ref_to_scan == NULL, "Constructed above"); |
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1858 pop_from_queue(ref_to_scan); |
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1859 if ((oop*)ref_to_scan != NULL) { |
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1860 if (ref_to_scan.is_narrow()) { |
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1861 assert(UseCompressedOops, "Error"); |
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1862 narrowOop* p = (narrowOop*)ref_to_scan; |
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1863 assert(!has_partial_array_mask(p) && |
|
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1864 _g1h->is_in_g1_reserved(oopDesc::load_decode_heap_oop(p)), "sanity"); |
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845
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1865 deal_with_reference(p); |
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1866 } else { |
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1867 oop* p = (oop*)ref_to_scan; |
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1868 assert((has_partial_array_mask(p) && _g1h->obj_in_cs(clear_partial_array_mask(p))) || |
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1869 _g1h->is_in_g1_reserved(oopDesc::load_decode_heap_oop(p)), "sanity"); |
|
845
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1870 deal_with_reference(p); |
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1871 } |
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1872 } |
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1873 } |
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1874 } |
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1875 } |
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1876 }; |