Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
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| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | 1316cec51b4d |
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| 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 | |
| 49 // If want to accumulate detailed statistics on work queues | |
| 50 // turn this on. | |
| 51 #define G1_DETAILED_STATS 0 | |
| 52 | |
| 53 #if G1_DETAILED_STATS | |
| 54 # define IF_G1_DETAILED_STATS(code) code | |
| 55 #else | |
| 56 # define IF_G1_DETAILED_STATS(code) | |
| 57 #endif | |
| 58 | |
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59 typedef GenericTaskQueue<StarTask> RefToScanQueue; |
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60 typedef GenericTaskQueueSet<RefToScanQueue> RefToScanQueueSet; |
| 342 | 61 |
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62 typedef int RegionIdx_t; // needs to hold [ 0..max_regions() ) |
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63 typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion ) |
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64 |
| 342 | 65 enum G1GCThreadGroups { |
| 66 G1CRGroup = 0, | |
| 67 G1ZFGroup = 1, | |
| 68 G1CMGroup = 2, | |
| 69 G1CLGroup = 3 | |
| 70 }; | |
| 71 | |
| 72 enum GCAllocPurpose { | |
| 73 GCAllocForTenured, | |
| 74 GCAllocForSurvived, | |
| 75 GCAllocPurposeCount | |
| 76 }; | |
| 77 | |
| 78 class YoungList : public CHeapObj { | |
| 79 private: | |
| 80 G1CollectedHeap* _g1h; | |
| 81 | |
| 82 HeapRegion* _head; | |
| 83 | |
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84 HeapRegion* _survivor_head; |
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85 HeapRegion* _survivor_tail; |
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86 |
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87 HeapRegion* _curr; |
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88 |
| 342 | 89 size_t _length; |
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90 size_t _survivor_length; |
| 342 | 91 |
| 92 size_t _last_sampled_rs_lengths; | |
| 93 size_t _sampled_rs_lengths; | |
| 94 | |
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95 void empty_list(HeapRegion* list); |
| 342 | 96 |
| 97 public: | |
| 98 YoungList(G1CollectedHeap* g1h); | |
| 99 | |
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100 void push_region(HeapRegion* hr); |
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101 void add_survivor_region(HeapRegion* hr); |
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102 |
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103 void empty_list(); |
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104 bool is_empty() { return _length == 0; } |
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105 size_t length() { return _length; } |
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106 size_t survivor_length() { return _survivor_length; } |
| 342 | 107 |
| 108 void rs_length_sampling_init(); | |
| 109 bool rs_length_sampling_more(); | |
| 110 void rs_length_sampling_next(); | |
| 111 | |
| 112 void reset_sampled_info() { | |
| 113 _last_sampled_rs_lengths = 0; | |
| 114 } | |
| 115 size_t sampled_rs_lengths() { return _last_sampled_rs_lengths; } | |
| 116 | |
| 117 // for development purposes | |
| 118 void reset_auxilary_lists(); | |
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119 void clear() { _head = NULL; _length = 0; } |
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120 |
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121 void clear_survivors() { |
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122 _survivor_head = NULL; |
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123 _survivor_tail = NULL; |
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124 _survivor_length = 0; |
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125 } |
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126 |
| 342 | 127 HeapRegion* first_region() { return _head; } |
| 128 HeapRegion* first_survivor_region() { return _survivor_head; } | |
| 545 | 129 HeapRegion* last_survivor_region() { return _survivor_tail; } |
| 342 | 130 |
| 131 // debugging | |
| 132 bool check_list_well_formed(); | |
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133 bool check_list_empty(bool check_sample = true); |
| 342 | 134 void print(); |
| 135 }; | |
| 136 | |
| 137 class RefineCardTableEntryClosure; | |
| 138 class G1CollectedHeap : public SharedHeap { | |
| 139 friend class VM_G1CollectForAllocation; | |
| 140 friend class VM_GenCollectForPermanentAllocation; | |
| 141 friend class VM_G1CollectFull; | |
| 142 friend class VM_G1IncCollectionPause; | |
| 143 friend class VMStructs; | |
| 144 | |
| 145 // Closures used in implementation. | |
| 146 friend class G1ParCopyHelper; | |
| 147 friend class G1IsAliveClosure; | |
| 148 friend class G1EvacuateFollowersClosure; | |
| 149 friend class G1ParScanThreadState; | |
| 150 friend class G1ParScanClosureSuper; | |
| 151 friend class G1ParEvacuateFollowersClosure; | |
| 152 friend class G1ParTask; | |
| 153 friend class G1FreeGarbageRegionClosure; | |
| 154 friend class RefineCardTableEntryClosure; | |
| 155 friend class G1PrepareCompactClosure; | |
| 156 friend class RegionSorter; | |
| 157 friend class CountRCClosure; | |
| 158 friend class EvacPopObjClosure; | |
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159 friend class G1ParCleanupCTTask; |
| 342 | 160 |
| 161 // Other related classes. | |
| 162 friend class G1MarkSweep; | |
| 163 | |
| 164 private: | |
| 165 // The one and only G1CollectedHeap, so static functions can find it. | |
| 166 static G1CollectedHeap* _g1h; | |
| 167 | |
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168 static size_t _humongous_object_threshold_in_words; |
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169 |
| 342 | 170 // Storage for the G1 heap (excludes the permanent generation). |
| 171 VirtualSpace _g1_storage; | |
| 172 MemRegion _g1_reserved; | |
| 173 | |
| 174 // The part of _g1_storage that is currently committed. | |
| 175 MemRegion _g1_committed; | |
| 176 | |
| 177 // The maximum part of _g1_storage that has ever been committed. | |
| 178 MemRegion _g1_max_committed; | |
| 179 | |
| 180 // The number of regions that are completely free. | |
| 181 size_t _free_regions; | |
| 182 | |
| 183 // The number of regions we could create by expansion. | |
| 184 size_t _expansion_regions; | |
| 185 | |
| 186 // Return the number of free regions in the heap (by direct counting.) | |
| 187 size_t count_free_regions(); | |
| 188 // Return the number of free regions on the free and unclean lists. | |
| 189 size_t count_free_regions_list(); | |
| 190 | |
| 191 // The block offset table for the G1 heap. | |
| 192 G1BlockOffsetSharedArray* _bot_shared; | |
| 193 | |
| 194 // Move all of the regions off the free lists, then rebuild those free | |
| 195 // lists, before and after full GC. | |
| 196 void tear_down_region_lists(); | |
| 197 void rebuild_region_lists(); | |
| 198 // This sets all non-empty regions to need zero-fill (which they will if | |
| 199 // they are empty after full collection.) | |
| 200 void set_used_regions_to_need_zero_fill(); | |
| 201 | |
| 202 // The sequence of all heap regions in the heap. | |
| 203 HeapRegionSeq* _hrs; | |
| 204 | |
| 205 // The region from which normal-sized objects are currently being | |
| 206 // allocated. May be NULL. | |
| 207 HeapRegion* _cur_alloc_region; | |
| 208 | |
| 209 // Postcondition: cur_alloc_region == NULL. | |
| 210 void abandon_cur_alloc_region(); | |
| 636 | 211 void abandon_gc_alloc_regions(); |
| 342 | 212 |
| 213 // The to-space memory regions into which objects are being copied during | |
| 214 // a GC. | |
| 215 HeapRegion* _gc_alloc_regions[GCAllocPurposeCount]; | |
| 545 | 216 size_t _gc_alloc_region_counts[GCAllocPurposeCount]; |
| 636 | 217 // These are the regions, one per GCAllocPurpose, that are half-full |
| 218 // at the end of a collection and that we want to reuse during the | |
| 219 // next collection. | |
| 220 HeapRegion* _retained_gc_alloc_regions[GCAllocPurposeCount]; | |
| 221 // This specifies whether we will keep the last half-full region at | |
| 222 // the end of a collection so that it can be reused during the next | |
| 223 // collection (this is specified per GCAllocPurpose) | |
| 224 bool _retain_gc_alloc_region[GCAllocPurposeCount]; | |
| 342 | 225 |
| 226 // A list of the regions that have been set to be alloc regions in the | |
| 227 // current collection. | |
| 228 HeapRegion* _gc_alloc_region_list; | |
| 229 | |
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230 // Determines PLAB size for a particular allocation purpose. |
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231 static size_t desired_plab_sz(GCAllocPurpose purpose); |
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232 |
| 342 | 233 // When called by par thread, require par_alloc_during_gc_lock() to be held. |
| 234 void push_gc_alloc_region(HeapRegion* hr); | |
| 235 | |
| 236 // This should only be called single-threaded. Undeclares all GC alloc | |
| 237 // regions. | |
| 238 void forget_alloc_region_list(); | |
| 239 | |
| 240 // Should be used to set an alloc region, because there's other | |
| 241 // associated bookkeeping. | |
| 242 void set_gc_alloc_region(int purpose, HeapRegion* r); | |
| 243 | |
| 244 // Check well-formedness of alloc region list. | |
| 245 bool check_gc_alloc_regions(); | |
| 246 | |
| 247 // Outside of GC pauses, the number of bytes used in all regions other | |
| 248 // than the current allocation region. | |
| 249 size_t _summary_bytes_used; | |
| 250 | |
| 526 | 251 // This is used for a quick test on whether a reference points into |
| 252 // the collection set or not. Basically, we have an array, with one | |
| 253 // byte per region, and that byte denotes whether the corresponding | |
| 254 // region is in the collection set or not. The entry corresponding | |
| 255 // the bottom of the heap, i.e., region 0, is pointed to by | |
| 256 // _in_cset_fast_test_base. The _in_cset_fast_test field has been | |
| 257 // biased so that it actually points to address 0 of the address | |
| 258 // space, to make the test as fast as possible (we can simply shift | |
| 259 // the address to address into it, instead of having to subtract the | |
| 260 // bottom of the heap from the address before shifting it; basically | |
| 261 // it works in the same way the card table works). | |
| 262 bool* _in_cset_fast_test; | |
| 263 | |
| 264 // The allocated array used for the fast test on whether a reference | |
| 265 // points into the collection set or not. This field is also used to | |
| 266 // free the array. | |
| 267 bool* _in_cset_fast_test_base; | |
| 268 | |
| 269 // The length of the _in_cset_fast_test_base array. | |
| 270 size_t _in_cset_fast_test_length; | |
| 271 | |
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272 volatile unsigned _gc_time_stamp; |
| 342 | 273 |
| 274 size_t* _surviving_young_words; | |
| 275 | |
| 276 void setup_surviving_young_words(); | |
| 277 void update_surviving_young_words(size_t* surv_young_words); | |
| 278 void cleanup_surviving_young_words(); | |
| 279 | |
| 280 protected: | |
| 281 | |
| 282 // Returns "true" iff none of the gc alloc regions have any allocations | |
| 283 // since the last call to "save_marks". | |
| 284 bool all_alloc_regions_no_allocs_since_save_marks(); | |
| 545 | 285 // Perform finalization stuff on all allocation regions. |
| 286 void retire_all_alloc_regions(); | |
| 342 | 287 |
| 288 // The number of regions allocated to hold humongous objects. | |
| 289 int _num_humongous_regions; | |
| 290 YoungList* _young_list; | |
| 291 | |
| 292 // The current policy object for the collector. | |
| 293 G1CollectorPolicy* _g1_policy; | |
| 294 | |
| 295 // Parallel allocation lock to protect the current allocation region. | |
| 296 Mutex _par_alloc_during_gc_lock; | |
| 297 Mutex* par_alloc_during_gc_lock() { return &_par_alloc_during_gc_lock; } | |
| 298 | |
| 299 // If possible/desirable, allocate a new HeapRegion for normal object | |
| 300 // allocation sufficient for an allocation of the given "word_size". | |
| 301 // If "do_expand" is true, will attempt to expand the heap if necessary | |
| 302 // to to satisfy the request. If "zero_filled" is true, requires a | |
| 303 // zero-filled region. | |
| 304 // (Returning NULL will trigger a GC.) | |
| 305 virtual HeapRegion* newAllocRegion_work(size_t word_size, | |
| 306 bool do_expand, | |
| 307 bool zero_filled); | |
| 308 | |
| 309 virtual HeapRegion* newAllocRegion(size_t word_size, | |
| 310 bool zero_filled = true) { | |
| 311 return newAllocRegion_work(word_size, false, zero_filled); | |
| 312 } | |
| 313 virtual HeapRegion* newAllocRegionWithExpansion(int purpose, | |
| 314 size_t word_size, | |
| 315 bool zero_filled = true); | |
| 316 | |
| 317 // Attempt to allocate an object of the given (very large) "word_size". | |
| 318 // Returns "NULL" on failure. | |
| 319 virtual HeapWord* humongousObjAllocate(size_t word_size); | |
| 320 | |
| 321 // If possible, allocate a block of the given word_size, else return "NULL". | |
| 322 // Returning NULL will trigger GC or heap expansion. | |
| 323 // These two methods have rather awkward pre- and | |
| 324 // post-conditions. If they are called outside a safepoint, then | |
| 325 // they assume that the caller is holding the heap lock. Upon return | |
| 326 // they release the heap lock, if they are returning a non-NULL | |
| 327 // value. attempt_allocation_slow() also dirties the cards of a | |
| 328 // newly-allocated young region after it releases the heap | |
| 329 // lock. This change in interface was the neatest way to achieve | |
| 330 // this card dirtying without affecting mem_allocate(), which is a | |
| 331 // more frequently called method. We tried two or three different | |
| 332 // approaches, but they were even more hacky. | |
| 333 HeapWord* attempt_allocation(size_t word_size, | |
| 334 bool permit_collection_pause = true); | |
| 335 | |
| 336 HeapWord* attempt_allocation_slow(size_t word_size, | |
| 337 bool permit_collection_pause = true); | |
| 338 | |
| 339 // Allocate blocks during garbage collection. Will ensure an | |
| 340 // allocation region, either by picking one or expanding the | |
| 341 // heap, and then allocate a block of the given size. The block | |
| 342 // may not be a humongous - it must fit into a single heap region. | |
| 343 HeapWord* allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
| 344 HeapWord* par_allocate_during_gc(GCAllocPurpose purpose, size_t word_size); | |
| 345 | |
| 346 HeapWord* allocate_during_gc_slow(GCAllocPurpose purpose, | |
| 347 HeapRegion* alloc_region, | |
| 348 bool par, | |
| 349 size_t word_size); | |
| 350 | |
| 351 // Ensure that no further allocations can happen in "r", bearing in mind | |
| 352 // that parallel threads might be attempting allocations. | |
| 353 void par_allocate_remaining_space(HeapRegion* r); | |
| 354 | |
| 545 | 355 // Retires an allocation region when it is full or at the end of a |
| 356 // GC pause. | |
| 357 void retire_alloc_region(HeapRegion* alloc_region, bool par); | |
| 358 | |
| 342 | 359 // Helper function for two callbacks below. |
| 360 // "full", if true, indicates that the GC is for a System.gc() request, | |
| 361 // and should collect the entire heap. If "clear_all_soft_refs" is true, | |
| 362 // all soft references are cleared during the GC. If "full" is false, | |
| 363 // "word_size" describes the allocation that the GC should | |
| 364 // attempt (at least) to satisfy. | |
| 365 void do_collection(bool full, bool clear_all_soft_refs, | |
| 366 size_t word_size); | |
| 367 | |
| 368 // Callback from VM_G1CollectFull operation. | |
| 369 // Perform a full collection. | |
| 370 void do_full_collection(bool clear_all_soft_refs); | |
| 371 | |
| 372 // Resize the heap if necessary after a full collection. If this is | |
| 373 // after a collect-for allocation, "word_size" is the allocation size, | |
| 374 // and will be considered part of the used portion of the heap. | |
| 375 void resize_if_necessary_after_full_collection(size_t word_size); | |
| 376 | |
| 377 // Callback from VM_G1CollectForAllocation operation. | |
| 378 // This function does everything necessary/possible to satisfy a | |
| 379 // failed allocation request (including collection, expansion, etc.) | |
| 380 HeapWord* satisfy_failed_allocation(size_t word_size); | |
| 381 | |
| 382 // Attempting to expand the heap sufficiently | |
| 383 // to support an allocation of the given "word_size". If | |
| 384 // successful, perform the allocation and return the address of the | |
| 385 // allocated block, or else "NULL". | |
| 386 virtual HeapWord* expand_and_allocate(size_t word_size); | |
| 387 | |
| 388 public: | |
| 389 // Expand the garbage-first heap by at least the given size (in bytes!). | |
| 390 // (Rounds up to a HeapRegion boundary.) | |
| 391 virtual void expand(size_t expand_bytes); | |
| 392 | |
| 393 // Do anything common to GC's. | |
| 394 virtual void gc_prologue(bool full); | |
| 395 virtual void gc_epilogue(bool full); | |
| 396 | |
| 526 | 397 // We register a region with the fast "in collection set" test. We |
| 398 // simply set to true the array slot corresponding to this region. | |
| 399 void register_region_with_in_cset_fast_test(HeapRegion* r) { | |
| 400 assert(_in_cset_fast_test_base != NULL, "sanity"); | |
| 401 assert(r->in_collection_set(), "invariant"); | |
| 402 int index = r->hrs_index(); | |
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403 assert(0 <= index && (size_t) index < _in_cset_fast_test_length, "invariant"); |
| 526 | 404 assert(!_in_cset_fast_test_base[index], "invariant"); |
| 405 _in_cset_fast_test_base[index] = true; | |
| 406 } | |
| 407 | |
| 408 // This is a fast test on whether a reference points into the | |
| 409 // collection set or not. It does not assume that the reference | |
| 410 // points into the heap; if it doesn't, it will return false. | |
| 411 bool in_cset_fast_test(oop obj) { | |
| 412 assert(_in_cset_fast_test != NULL, "sanity"); | |
| 413 if (_g1_committed.contains((HeapWord*) obj)) { | |
| 414 // no need to subtract the bottom of the heap from obj, | |
| 415 // _in_cset_fast_test is biased | |
| 416 size_t index = ((size_t) obj) >> HeapRegion::LogOfHRGrainBytes; | |
| 417 bool ret = _in_cset_fast_test[index]; | |
| 418 // let's make sure the result is consistent with what the slower | |
| 419 // test returns | |
| 420 assert( ret || !obj_in_cs(obj), "sanity"); | |
| 421 assert(!ret || obj_in_cs(obj), "sanity"); | |
| 422 return ret; | |
| 423 } else { | |
| 424 return false; | |
| 425 } | |
| 426 } | |
| 427 | |
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428 void clear_cset_fast_test() { |
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429 assert(_in_cset_fast_test_base != NULL, "sanity"); |
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430 memset(_in_cset_fast_test_base, false, |
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431 _in_cset_fast_test_length * sizeof(bool)); |
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432 } |
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433 |
| 342 | 434 protected: |
| 435 | |
| 436 // Shrink the garbage-first heap by at most the given size (in bytes!). | |
| 437 // (Rounds down to a HeapRegion boundary.) | |
| 438 virtual void shrink(size_t expand_bytes); | |
| 439 void shrink_helper(size_t expand_bytes); | |
| 440 | |
| 441 // Do an incremental collection: identify a collection set, and evacuate | |
| 442 // its live objects elsewhere. | |
| 443 virtual void do_collection_pause(); | |
| 444 | |
| 445 // The guts of the incremental collection pause, executed by the vm | |
| 677 | 446 // thread. |
| 447 virtual void do_collection_pause_at_safepoint(); | |
| 342 | 448 |
| 449 // Actually do the work of evacuating the collection set. | |
| 450 virtual void evacuate_collection_set(); | |
| 451 | |
| 452 // If this is an appropriate right time, do a collection pause. | |
| 453 // The "word_size" argument, if non-zero, indicates the size of an | |
| 454 // allocation request that is prompting this query. | |
| 455 void do_collection_pause_if_appropriate(size_t word_size); | |
| 456 | |
| 457 // The g1 remembered set of the heap. | |
| 458 G1RemSet* _g1_rem_set; | |
| 459 // And it's mod ref barrier set, used to track updates for the above. | |
| 460 ModRefBarrierSet* _mr_bs; | |
| 461 | |
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462 // A set of cards that cover the objects for which the Rsets should be updated |
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463 // concurrently after the collection. |
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464 DirtyCardQueueSet _dirty_card_queue_set; |
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465 |
| 342 | 466 // The Heap Region Rem Set Iterator. |
| 467 HeapRegionRemSetIterator** _rem_set_iterator; | |
| 468 | |
| 469 // The closure used to refine a single card. | |
| 470 RefineCardTableEntryClosure* _refine_cte_cl; | |
| 471 | |
| 472 // A function to check the consistency of dirty card logs. | |
| 473 void check_ct_logs_at_safepoint(); | |
| 474 | |
| 475 // After a collection pause, make the regions in the CS into free | |
| 476 // regions. | |
| 477 void free_collection_set(HeapRegion* cs_head); | |
| 478 | |
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479 // Abandon the current collection set without recording policy |
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480 // statistics or updating free lists. |
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481 void abandon_collection_set(HeapRegion* cs_head); |
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482 |
| 342 | 483 // Applies "scan_non_heap_roots" to roots outside the heap, |
| 484 // "scan_rs" to roots inside the heap (having done "set_region" to | |
| 485 // indicate the region in which the root resides), and does "scan_perm" | |
| 486 // (setting the generation to the perm generation.) If "scan_rs" is | |
| 487 // NULL, then this step is skipped. The "worker_i" | |
| 488 // param is for use with parallel roots processing, and should be | |
| 489 // the "i" of the calling parallel worker thread's work(i) function. | |
| 490 // In the sequential case this param will be ignored. | |
| 491 void g1_process_strong_roots(bool collecting_perm_gen, | |
| 492 SharedHeap::ScanningOption so, | |
| 493 OopClosure* scan_non_heap_roots, | |
| 494 OopsInHeapRegionClosure* scan_rs, | |
| 495 OopsInGenClosure* scan_perm, | |
| 496 int worker_i); | |
| 497 | |
| 498 // Apply "blk" to all the weak roots of the system. These include | |
| 499 // JNI weak roots, the code cache, system dictionary, symbol table, | |
| 500 // string table, and referents of reachable weak refs. | |
| 501 void g1_process_weak_roots(OopClosure* root_closure, | |
| 502 OopClosure* non_root_closure); | |
| 503 | |
| 504 // Invoke "save_marks" on all heap regions. | |
| 505 void save_marks(); | |
| 506 | |
| 507 // Free a heap region. | |
| 508 void free_region(HeapRegion* hr); | |
| 509 // A component of "free_region", exposed for 'batching'. | |
| 510 // All the params after "hr" are out params: the used bytes of the freed | |
| 511 // region(s), the number of H regions cleared, the number of regions | |
| 512 // freed, and pointers to the head and tail of a list of freed contig | |
| 513 // regions, linked throught the "next_on_unclean_list" field. | |
| 514 void free_region_work(HeapRegion* hr, | |
| 515 size_t& pre_used, | |
| 516 size_t& cleared_h, | |
| 517 size_t& freed_regions, | |
| 518 UncleanRegionList* list, | |
| 519 bool par = false); | |
| 520 | |
| 521 | |
| 522 // The concurrent marker (and the thread it runs in.) | |
| 523 ConcurrentMark* _cm; | |
| 524 ConcurrentMarkThread* _cmThread; | |
| 525 bool _mark_in_progress; | |
| 526 | |
| 527 // The concurrent refiner. | |
| 528 ConcurrentG1Refine* _cg1r; | |
| 529 | |
| 530 // The concurrent zero-fill thread. | |
| 531 ConcurrentZFThread* _czft; | |
| 532 | |
| 533 // The parallel task queues | |
| 534 RefToScanQueueSet *_task_queues; | |
| 535 | |
| 536 // True iff a evacuation has failed in the current collection. | |
| 537 bool _evacuation_failed; | |
| 538 | |
| 539 // Set the attribute indicating whether evacuation has failed in the | |
| 540 // current collection. | |
| 541 void set_evacuation_failed(bool b) { _evacuation_failed = b; } | |
| 542 | |
| 543 // Failed evacuations cause some logical from-space objects to have | |
| 544 // forwarding pointers to themselves. Reset them. | |
| 545 void remove_self_forwarding_pointers(); | |
| 546 | |
| 547 // When one is non-null, so is the other. Together, they each pair is | |
| 548 // an object with a preserved mark, and its mark value. | |
| 549 GrowableArray<oop>* _objs_with_preserved_marks; | |
| 550 GrowableArray<markOop>* _preserved_marks_of_objs; | |
| 551 | |
| 552 // Preserve the mark of "obj", if necessary, in preparation for its mark | |
| 553 // word being overwritten with a self-forwarding-pointer. | |
| 554 void preserve_mark_if_necessary(oop obj, markOop m); | |
| 555 | |
| 556 // The stack of evac-failure objects left to be scanned. | |
| 557 GrowableArray<oop>* _evac_failure_scan_stack; | |
| 558 // The closure to apply to evac-failure objects. | |
| 559 | |
| 560 OopsInHeapRegionClosure* _evac_failure_closure; | |
| 561 // Set the field above. | |
| 562 void | |
| 563 set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_closure) { | |
| 564 _evac_failure_closure = evac_failure_closure; | |
| 565 } | |
| 566 | |
| 567 // Push "obj" on the scan stack. | |
| 568 void push_on_evac_failure_scan_stack(oop obj); | |
| 569 // Process scan stack entries until the stack is empty. | |
| 570 void drain_evac_failure_scan_stack(); | |
| 571 // True iff an invocation of "drain_scan_stack" is in progress; to | |
| 572 // prevent unnecessary recursion. | |
| 573 bool _drain_in_progress; | |
| 574 | |
| 575 // Do any necessary initialization for evacuation-failure handling. | |
| 576 // "cl" is the closure that will be used to process evac-failure | |
| 577 // objects. | |
| 578 void init_for_evac_failure(OopsInHeapRegionClosure* cl); | |
| 579 // Do any necessary cleanup for evacuation-failure handling data | |
| 580 // structures. | |
| 581 void finalize_for_evac_failure(); | |
| 582 | |
| 583 // An attempt to evacuate "obj" has failed; take necessary steps. | |
| 584 void handle_evacuation_failure(oop obj); | |
| 585 oop handle_evacuation_failure_par(OopsInHeapRegionClosure* cl, oop obj); | |
| 586 void handle_evacuation_failure_common(oop obj, markOop m); | |
| 587 | |
| 588 | |
| 589 // Ensure that the relevant gc_alloc regions are set. | |
| 590 void get_gc_alloc_regions(); | |
| 636 | 591 // We're done with GC alloc regions. We are going to tear down the |
| 592 // gc alloc list and remove the gc alloc tag from all the regions on | |
| 593 // that list. However, we will also retain the last (i.e., the one | |
| 594 // that is half-full) GC alloc region, per GCAllocPurpose, for | |
| 595 // possible reuse during the next collection, provided | |
| 596 // _retain_gc_alloc_region[] indicates that it should be the | |
| 597 // case. Said regions are kept in the _retained_gc_alloc_regions[] | |
| 598 // array. If the parameter totally is set, we will not retain any | |
| 599 // regions, irrespective of what _retain_gc_alloc_region[] | |
| 600 // indicates. | |
| 601 void release_gc_alloc_regions(bool totally); | |
| 602 #ifndef PRODUCT | |
| 603 // Useful for debugging. | |
| 604 void print_gc_alloc_regions(); | |
| 605 #endif // !PRODUCT | |
| 342 | 606 |
| 607 // ("Weak") Reference processing support | |
| 608 ReferenceProcessor* _ref_processor; | |
| 609 | |
| 610 enum G1H_process_strong_roots_tasks { | |
| 611 G1H_PS_mark_stack_oops_do, | |
| 612 G1H_PS_refProcessor_oops_do, | |
| 613 // Leave this one last. | |
| 614 G1H_PS_NumElements | |
| 615 }; | |
| 616 | |
| 617 SubTasksDone* _process_strong_tasks; | |
| 618 | |
| 619 // List of regions which require zero filling. | |
| 620 UncleanRegionList _unclean_region_list; | |
| 621 bool _unclean_regions_coming; | |
| 622 | |
| 623 public: | |
| 624 void set_refine_cte_cl_concurrency(bool concurrent); | |
| 625 | |
| 626 RefToScanQueue *task_queue(int i); | |
| 627 | |
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628 // A set of cards where updates happened during the GC |
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629 DirtyCardQueueSet& dirty_card_queue_set() { return _dirty_card_queue_set; } |
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630 |
| 342 | 631 // Create a G1CollectedHeap with the specified policy. |
| 632 // Must call the initialize method afterwards. | |
| 633 // May not return if something goes wrong. | |
| 634 G1CollectedHeap(G1CollectorPolicy* policy); | |
| 635 | |
| 636 // Initialize the G1CollectedHeap to have the initial and | |
| 637 // maximum sizes, permanent generation, and remembered and barrier sets | |
| 638 // specified by the policy object. | |
| 639 jint initialize(); | |
| 640 | |
| 641 void ref_processing_init(); | |
| 642 | |
| 643 void set_par_threads(int t) { | |
| 644 SharedHeap::set_par_threads(t); | |
| 645 _process_strong_tasks->set_par_threads(t); | |
| 646 } | |
| 647 | |
| 648 virtual CollectedHeap::Name kind() const { | |
| 649 return CollectedHeap::G1CollectedHeap; | |
| 650 } | |
| 651 | |
| 652 // The current policy object for the collector. | |
| 653 G1CollectorPolicy* g1_policy() const { return _g1_policy; } | |
| 654 | |
| 655 // Adaptive size policy. No such thing for g1. | |
| 656 virtual AdaptiveSizePolicy* size_policy() { return NULL; } | |
| 657 | |
| 658 // The rem set and barrier set. | |
| 659 G1RemSet* g1_rem_set() const { return _g1_rem_set; } | |
| 660 ModRefBarrierSet* mr_bs() const { return _mr_bs; } | |
| 661 | |
| 662 // The rem set iterator. | |
| 663 HeapRegionRemSetIterator* rem_set_iterator(int i) { | |
| 664 return _rem_set_iterator[i]; | |
| 665 } | |
| 666 | |
| 667 HeapRegionRemSetIterator* rem_set_iterator() { | |
| 668 return _rem_set_iterator[0]; | |
| 669 } | |
| 670 | |
| 671 unsigned get_gc_time_stamp() { | |
| 672 return _gc_time_stamp; | |
| 673 } | |
| 674 | |
| 675 void reset_gc_time_stamp() { | |
| 676 _gc_time_stamp = 0; | |
|
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677 OrderAccess::fence(); |
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678 } |
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679 |
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680 void increment_gc_time_stamp() { |
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681 ++_gc_time_stamp; |
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682 OrderAccess::fence(); |
| 342 | 683 } |
| 684 | |
| 685 void iterate_dirty_card_closure(bool concurrent, int worker_i); | |
| 686 | |
| 687 // The shared block offset table array. | |
| 688 G1BlockOffsetSharedArray* bot_shared() const { return _bot_shared; } | |
| 689 | |
| 690 // Reference Processing accessor | |
| 691 ReferenceProcessor* ref_processor() { return _ref_processor; } | |
| 692 | |
| 693 // Reserved (g1 only; super method includes perm), capacity and the used | |
| 694 // portion in bytes. | |
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695 size_t g1_reserved_obj_bytes() const { return _g1_reserved.byte_size(); } |
| 342 | 696 virtual size_t capacity() const; |
| 697 virtual size_t used() const; | |
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698 // This should be called when we're not holding the heap lock. The |
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699 // result might be a bit inaccurate. |
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700 size_t used_unlocked() const; |
| 342 | 701 size_t recalculate_used() const; |
| 702 #ifndef PRODUCT | |
| 703 size_t recalculate_used_regions() const; | |
| 704 #endif // PRODUCT | |
| 705 | |
| 706 // These virtual functions do the actual allocation. | |
| 707 virtual HeapWord* mem_allocate(size_t word_size, | |
| 708 bool is_noref, | |
| 709 bool is_tlab, | |
| 710 bool* gc_overhead_limit_was_exceeded); | |
| 711 | |
| 712 // Some heaps may offer a contiguous region for shared non-blocking | |
| 713 // allocation, via inlined code (by exporting the address of the top and | |
| 714 // end fields defining the extent of the contiguous allocation region.) | |
| 715 // But G1CollectedHeap doesn't yet support this. | |
| 716 | |
| 717 // Return an estimate of the maximum allocation that could be performed | |
| 718 // without triggering any collection or expansion activity. In a | |
| 719 // generational collector, for example, this is probably the largest | |
| 720 // allocation that could be supported (without expansion) in the youngest | |
| 721 // generation. It is "unsafe" because no locks are taken; the result | |
| 722 // should be treated as an approximation, not a guarantee, for use in | |
| 723 // heuristic resizing decisions. | |
| 724 virtual size_t unsafe_max_alloc(); | |
| 725 | |
| 726 virtual bool is_maximal_no_gc() const { | |
| 727 return _g1_storage.uncommitted_size() == 0; | |
| 728 } | |
| 729 | |
| 730 // The total number of regions in the heap. | |
| 731 size_t n_regions(); | |
| 732 | |
| 733 // The number of regions that are completely free. | |
| 734 size_t max_regions(); | |
| 735 | |
| 736 // The number of regions that are completely free. | |
| 737 size_t free_regions(); | |
| 738 | |
| 739 // The number of regions that are not completely free. | |
| 740 size_t used_regions() { return n_regions() - free_regions(); } | |
| 741 | |
| 742 // True iff the ZF thread should run. | |
| 743 bool should_zf(); | |
| 744 | |
| 745 // The number of regions available for "regular" expansion. | |
| 746 size_t expansion_regions() { return _expansion_regions; } | |
| 747 | |
| 748 #ifndef PRODUCT | |
| 749 bool regions_accounted_for(); | |
| 750 bool print_region_accounting_info(); | |
| 751 void print_region_counts(); | |
| 752 #endif | |
| 753 | |
| 754 HeapRegion* alloc_region_from_unclean_list(bool zero_filled); | |
| 755 HeapRegion* alloc_region_from_unclean_list_locked(bool zero_filled); | |
| 756 | |
| 757 void put_region_on_unclean_list(HeapRegion* r); | |
| 758 void put_region_on_unclean_list_locked(HeapRegion* r); | |
| 759 | |
| 760 void prepend_region_list_on_unclean_list(UncleanRegionList* list); | |
| 761 void prepend_region_list_on_unclean_list_locked(UncleanRegionList* list); | |
| 762 | |
| 763 void set_unclean_regions_coming(bool b); | |
| 764 void set_unclean_regions_coming_locked(bool b); | |
| 765 // Wait for cleanup to be complete. | |
| 766 void wait_for_cleanup_complete(); | |
| 767 // Like above, but assumes that the calling thread owns the Heap_lock. | |
| 768 void wait_for_cleanup_complete_locked(); | |
| 769 | |
| 770 // Return the head of the unclean list. | |
| 771 HeapRegion* peek_unclean_region_list_locked(); | |
| 772 // Remove and return the head of the unclean list. | |
| 773 HeapRegion* pop_unclean_region_list_locked(); | |
| 774 | |
| 775 // List of regions which are zero filled and ready for allocation. | |
| 776 HeapRegion* _free_region_list; | |
| 777 // Number of elements on the free list. | |
| 778 size_t _free_region_list_size; | |
| 779 | |
| 780 // If the head of the unclean list is ZeroFilled, move it to the free | |
| 781 // list. | |
| 782 bool move_cleaned_region_to_free_list_locked(); | |
| 783 bool move_cleaned_region_to_free_list(); | |
| 784 | |
| 785 void put_free_region_on_list_locked(HeapRegion* r); | |
| 786 void put_free_region_on_list(HeapRegion* r); | |
| 787 | |
| 788 // Remove and return the head element of the free list. | |
| 789 HeapRegion* pop_free_region_list_locked(); | |
| 790 | |
| 791 // If "zero_filled" is true, we first try the free list, then we try the | |
| 792 // unclean list, zero-filling the result. If "zero_filled" is false, we | |
| 793 // first try the unclean list, then the zero-filled list. | |
| 794 HeapRegion* alloc_free_region_from_lists(bool zero_filled); | |
| 795 | |
| 796 // Verify the integrity of the region lists. | |
| 797 void remove_allocated_regions_from_lists(); | |
| 798 bool verify_region_lists(); | |
| 799 bool verify_region_lists_locked(); | |
| 800 size_t unclean_region_list_length(); | |
| 801 size_t free_region_list_length(); | |
| 802 | |
| 803 // Perform a collection of the heap; intended for use in implementing | |
| 804 // "System.gc". This probably implies as full a collection as the | |
| 805 // "CollectedHeap" supports. | |
| 806 virtual void collect(GCCause::Cause cause); | |
| 807 | |
| 808 // The same as above but assume that the caller holds the Heap_lock. | |
| 809 void collect_locked(GCCause::Cause cause); | |
| 810 | |
| 811 // This interface assumes that it's being called by the | |
| 812 // vm thread. It collects the heap assuming that the | |
| 813 // heap lock is already held and that we are executing in | |
| 814 // the context of the vm thread. | |
| 815 virtual void collect_as_vm_thread(GCCause::Cause cause); | |
| 816 | |
| 817 // True iff a evacuation has failed in the most-recent collection. | |
| 818 bool evacuation_failed() { return _evacuation_failed; } | |
| 819 | |
| 820 // Free a region if it is totally full of garbage. Returns the number of | |
| 821 // bytes freed (0 ==> didn't free it). | |
| 822 size_t free_region_if_totally_empty(HeapRegion *hr); | |
| 823 void free_region_if_totally_empty_work(HeapRegion *hr, | |
| 824 size_t& pre_used, | |
| 825 size_t& cleared_h_regions, | |
| 826 size_t& freed_regions, | |
| 827 UncleanRegionList* list, | |
| 828 bool par = false); | |
| 829 | |
| 830 // If we've done free region work that yields the given changes, update | |
| 831 // the relevant global variables. | |
| 832 void finish_free_region_work(size_t pre_used, | |
| 833 size_t cleared_h_regions, | |
| 834 size_t freed_regions, | |
| 835 UncleanRegionList* list); | |
| 836 | |
| 837 | |
| 838 // Returns "TRUE" iff "p" points into the allocated area of the heap. | |
| 839 virtual bool is_in(const void* p) const; | |
| 840 | |
| 841 // Return "TRUE" iff the given object address is within the collection | |
| 842 // set. | |
| 843 inline bool obj_in_cs(oop obj); | |
| 844 | |
| 845 // Return "TRUE" iff the given object address is in the reserved | |
| 846 // region of g1 (excluding the permanent generation). | |
| 847 bool is_in_g1_reserved(const void* p) const { | |
| 848 return _g1_reserved.contains(p); | |
| 849 } | |
| 850 | |
| 851 // Returns a MemRegion that corresponds to the space that has been | |
| 852 // committed in the heap | |
| 853 MemRegion g1_committed() { | |
| 854 return _g1_committed; | |
| 855 } | |
| 856 | |
| 941 | 857 NOT_PRODUCT(bool is_in_closed_subset(const void* p) const;) |
| 342 | 858 |
| 859 // Dirty card table entries covering a list of young regions. | |
| 860 void dirtyCardsForYoungRegions(CardTableModRefBS* ct_bs, HeapRegion* list); | |
| 861 | |
| 862 // This resets the card table to all zeros. It is used after | |
| 863 // a collection pause which used the card table to claim cards. | |
| 864 void cleanUpCardTable(); | |
| 865 | |
| 866 // Iteration functions. | |
| 867 | |
| 868 // Iterate over all the ref-containing fields of all objects, calling | |
| 869 // "cl.do_oop" on each. | |
| 678 | 870 virtual void oop_iterate(OopClosure* cl) { |
| 871 oop_iterate(cl, true); | |
| 872 } | |
| 873 void oop_iterate(OopClosure* cl, bool do_perm); | |
| 342 | 874 |
| 875 // Same as above, restricted to a memory region. | |
| 678 | 876 virtual void oop_iterate(MemRegion mr, OopClosure* cl) { |
| 877 oop_iterate(mr, cl, true); | |
| 878 } | |
| 879 void oop_iterate(MemRegion mr, OopClosure* cl, bool do_perm); | |
| 342 | 880 |
| 881 // Iterate over all objects, calling "cl.do_object" on each. | |
| 678 | 882 virtual void object_iterate(ObjectClosure* cl) { |
| 883 object_iterate(cl, true); | |
| 884 } | |
| 885 virtual void safe_object_iterate(ObjectClosure* cl) { | |
| 886 object_iterate(cl, true); | |
| 887 } | |
| 888 void object_iterate(ObjectClosure* cl, bool do_perm); | |
| 342 | 889 |
| 890 // Iterate over all objects allocated since the last collection, calling | |
| 891 // "cl.do_object" on each. The heap must have been initialized properly | |
| 892 // to support this function, or else this call will fail. | |
| 893 virtual void object_iterate_since_last_GC(ObjectClosure* cl); | |
| 894 | |
| 895 // Iterate over all spaces in use in the heap, in ascending address order. | |
| 896 virtual void space_iterate(SpaceClosure* cl); | |
| 897 | |
| 898 // Iterate over heap regions, in address order, terminating the | |
| 899 // iteration early if the "doHeapRegion" method returns "true". | |
| 900 void heap_region_iterate(HeapRegionClosure* blk); | |
| 901 | |
| 902 // Iterate over heap regions starting with r (or the first region if "r" | |
| 903 // is NULL), in address order, terminating early if the "doHeapRegion" | |
| 904 // method returns "true". | |
| 905 void heap_region_iterate_from(HeapRegion* r, HeapRegionClosure* blk); | |
| 906 | |
| 907 // As above but starting from the region at index idx. | |
| 908 void heap_region_iterate_from(int idx, HeapRegionClosure* blk); | |
| 909 | |
| 910 HeapRegion* region_at(size_t idx); | |
| 911 | |
| 912 // Divide the heap region sequence into "chunks" of some size (the number | |
| 913 // of regions divided by the number of parallel threads times some | |
| 914 // overpartition factor, currently 4). Assumes that this will be called | |
| 915 // in parallel by ParallelGCThreads worker threads with discinct worker | |
| 916 // ids in the range [0..max(ParallelGCThreads-1, 1)], that all parallel | |
| 917 // calls will use the same "claim_value", and that that claim value is | |
| 918 // different from the claim_value of any heap region before the start of | |
| 919 // the iteration. Applies "blk->doHeapRegion" to each of the regions, by | |
| 920 // attempting to claim the first region in each chunk, and, if | |
| 921 // successful, applying the closure to each region in the chunk (and | |
| 922 // setting the claim value of the second and subsequent regions of the | |
| 923 // chunk.) For now requires that "doHeapRegion" always returns "false", | |
| 924 // i.e., that a closure never attempt to abort a traversal. | |
| 925 void heap_region_par_iterate_chunked(HeapRegionClosure* blk, | |
| 926 int worker, | |
| 927 jint claim_value); | |
| 928 | |
| 390 | 929 // It resets all the region claim values to the default. |
| 930 void reset_heap_region_claim_values(); | |
| 931 | |
| 355 | 932 #ifdef ASSERT |
| 933 bool check_heap_region_claim_values(jint claim_value); | |
| 934 #endif // ASSERT | |
| 935 | |
| 342 | 936 // Iterate over the regions (if any) in the current collection set. |
| 937 void collection_set_iterate(HeapRegionClosure* blk); | |
| 938 | |
| 939 // As above but starting from region r | |
| 940 void collection_set_iterate_from(HeapRegion* r, HeapRegionClosure *blk); | |
| 941 | |
| 942 // Returns the first (lowest address) compactible space in the heap. | |
| 943 virtual CompactibleSpace* first_compactible_space(); | |
| 944 | |
| 945 // A CollectedHeap will contain some number of spaces. This finds the | |
| 946 // space containing a given address, or else returns NULL. | |
| 947 virtual Space* space_containing(const void* addr) const; | |
| 948 | |
| 949 // A G1CollectedHeap will contain some number of heap regions. This | |
| 950 // finds the region containing a given address, or else returns NULL. | |
| 951 HeapRegion* heap_region_containing(const void* addr) const; | |
| 952 | |
| 953 // Like the above, but requires "addr" to be in the heap (to avoid a | |
| 954 // null-check), and unlike the above, may return an continuing humongous | |
| 955 // region. | |
| 956 HeapRegion* heap_region_containing_raw(const void* addr) const; | |
| 957 | |
| 958 // A CollectedHeap is divided into a dense sequence of "blocks"; that is, | |
| 959 // each address in the (reserved) heap is a member of exactly | |
| 960 // one block. The defining characteristic of a block is that it is | |
| 961 // possible to find its size, and thus to progress forward to the next | |
| 962 // block. (Blocks may be of different sizes.) Thus, blocks may | |
| 963 // represent Java objects, or they might be free blocks in a | |
| 964 // free-list-based heap (or subheap), as long as the two kinds are | |
| 965 // distinguishable and the size of each is determinable. | |
| 966 | |
| 967 // Returns the address of the start of the "block" that contains the | |
| 968 // address "addr". We say "blocks" instead of "object" since some heaps | |
| 969 // may not pack objects densely; a chunk may either be an object or a | |
| 970 // non-object. | |
| 971 virtual HeapWord* block_start(const void* addr) const; | |
| 972 | |
| 973 // Requires "addr" to be the start of a chunk, and returns its size. | |
| 974 // "addr + size" is required to be the start of a new chunk, or the end | |
| 975 // of the active area of the heap. | |
| 976 virtual size_t block_size(const HeapWord* addr) const; | |
| 977 | |
| 978 // Requires "addr" to be the start of a block, and returns "TRUE" iff | |
| 979 // the block is an object. | |
| 980 virtual bool block_is_obj(const HeapWord* addr) const; | |
| 981 | |
| 982 // Does this heap support heap inspection? (+PrintClassHistogram) | |
| 983 virtual bool supports_heap_inspection() const { return true; } | |
| 984 | |
| 985 // Section on thread-local allocation buffers (TLABs) | |
| 986 // See CollectedHeap for semantics. | |
| 987 | |
| 988 virtual bool supports_tlab_allocation() const; | |
| 989 virtual size_t tlab_capacity(Thread* thr) const; | |
| 990 virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; | |
| 991 virtual HeapWord* allocate_new_tlab(size_t size); | |
| 992 | |
| 993 // Can a compiler initialize a new object without store barriers? | |
| 994 // This permission only extends from the creation of a new object | |
|
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995 // via a TLAB up to the first subsequent safepoint. If such permission |
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996 // is granted for this heap type, the compiler promises to call |
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997 // defer_store_barrier() below on any slow path allocation of |
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998 // a new object for which such initializing store barriers will |
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999 // have been elided. G1, like CMS, allows this, but should be |
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1000 // ready to provide a compensating write barrier as necessary |
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1001 // if that storage came out of a non-young region. The efficiency |
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1002 // of this implementation depends crucially on being able to |
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1003 // answer very efficiently in constant time whether a piece of |
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1004 // storage in the heap comes from a young region or not. |
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1005 // See ReduceInitialCardMarks. |
| 342 | 1006 virtual bool can_elide_tlab_store_barriers() const { |
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1007 // 6920090: Temporarily disabled, because of lingering |
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1008 // instabilities related to RICM with G1. In the |
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1009 // interim, the option ReduceInitialCardMarksForG1 |
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1010 // below is left solely as a debugging device at least |
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1011 // until 6920109 fixes the instabilities. |
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1012 return ReduceInitialCardMarksForG1; |
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1013 } |
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1014 |
| 1166 | 1015 virtual bool card_mark_must_follow_store() const { |
| 1016 return true; | |
| 1017 } | |
| 1018 | |
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1019 bool is_in_young(oop obj) { |
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1020 HeapRegion* hr = heap_region_containing(obj); |
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1021 return hr != NULL && hr->is_young(); |
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1022 } |
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1023 |
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1024 // We don't need barriers for initializing stores to objects |
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1025 // in the young gen: for the SATB pre-barrier, there is no |
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1026 // pre-value that needs to be remembered; for the remembered-set |
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1027 // update logging post-barrier, we don't maintain remembered set |
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1028 // information for young gen objects. Note that non-generational |
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1029 // G1 does not have any "young" objects, should not elide |
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1030 // the rs logging barrier and so should always answer false below. |
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1031 // However, non-generational G1 (-XX:-G1Gen) appears to have |
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1032 // bit-rotted so was not tested below. |
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1033 virtual bool can_elide_initializing_store_barrier(oop new_obj) { |
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1034 // Re 6920090, 6920109 above. |
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1035 assert(ReduceInitialCardMarksForG1, "Else cannot be here"); |
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1036 assert(G1Gen || !is_in_young(new_obj), |
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1037 "Non-generational G1 should never return true below"); |
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1038 return is_in_young(new_obj); |
| 342 | 1039 } |
| 1040 | |
| 1041 // Can a compiler elide a store barrier when it writes | |
| 1042 // a permanent oop into the heap? Applies when the compiler | |
| 1043 // is storing x to the heap, where x->is_perm() is true. | |
| 1044 virtual bool can_elide_permanent_oop_store_barriers() const { | |
| 1045 // At least until perm gen collection is also G1-ified, at | |
| 1046 // which point this should return false. | |
| 1047 return true; | |
| 1048 } | |
| 1049 | |
| 1050 virtual bool allocs_are_zero_filled(); | |
| 1051 | |
| 1052 // The boundary between a "large" and "small" array of primitives, in | |
| 1053 // words. | |
| 1054 virtual size_t large_typearray_limit(); | |
| 1055 | |
| 1056 // Returns "true" iff the given word_size is "very large". | |
| 1057 static bool isHumongous(size_t word_size) { | |
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1058 // Note this has to be strictly greater-than as the TLABs |
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1059 // are capped at the humongous thresold and we want to |
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1060 // ensure that we don't try to allocate a TLAB as |
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1061 // humongous and that we don't allocate a humongous |
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1062 // object in a TLAB. |
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1063 return word_size > _humongous_object_threshold_in_words; |
| 342 | 1064 } |
| 1065 | |
| 1066 // Update mod union table with the set of dirty cards. | |
| 1067 void updateModUnion(); | |
| 1068 | |
| 1069 // Set the mod union bits corresponding to the given memRegion. Note | |
| 1070 // that this is always a safe operation, since it doesn't clear any | |
| 1071 // bits. | |
| 1072 void markModUnionRange(MemRegion mr); | |
| 1073 | |
| 1074 // Records the fact that a marking phase is no longer in progress. | |
| 1075 void set_marking_complete() { | |
| 1076 _mark_in_progress = false; | |
| 1077 } | |
| 1078 void set_marking_started() { | |
| 1079 _mark_in_progress = true; | |
| 1080 } | |
| 1081 bool mark_in_progress() { | |
| 1082 return _mark_in_progress; | |
| 1083 } | |
| 1084 | |
| 1085 // Print the maximum heap capacity. | |
| 1086 virtual size_t max_capacity() const; | |
| 1087 | |
| 1088 virtual jlong millis_since_last_gc(); | |
| 1089 | |
| 1090 // Perform any cleanup actions necessary before allowing a verification. | |
| 1091 virtual void prepare_for_verify(); | |
| 1092 | |
| 1093 // Perform verification. | |
| 811 | 1094 |
| 1095 // use_prev_marking == true -> use "prev" marking information, | |
| 1096 // use_prev_marking == false -> use "next" marking information | |
| 1097 // NOTE: Only the "prev" marking information is guaranteed to be | |
| 1098 // consistent most of the time, so most calls to this should use | |
| 1099 // use_prev_marking == true. Currently, there is only one case where | |
| 1100 // this is called with use_prev_marking == false, which is to verify | |
| 1101 // the "next" marking information at the end of remark. | |
| 1102 void verify(bool allow_dirty, bool silent, bool use_prev_marking); | |
| 1103 | |
| 1104 // Override; it uses the "prev" marking information | |
| 342 | 1105 virtual void verify(bool allow_dirty, bool silent); |
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1106 // Default behavior by calling print(tty); |
| 342 | 1107 virtual void print() const; |
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1108 // This calls print_on(st, PrintHeapAtGCExtended). |
| 342 | 1109 virtual void print_on(outputStream* st) const; |
|
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1110 // If extended is true, it will print out information for all |
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1111 // regions in the heap by calling print_on_extended(st). |
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1112 virtual void print_on(outputStream* st, bool extended) const; |
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1113 virtual void print_on_extended(outputStream* st) const; |
| 342 | 1114 |
| 1115 virtual void print_gc_threads_on(outputStream* st) const; | |
| 1116 virtual void gc_threads_do(ThreadClosure* tc) const; | |
| 1117 | |
| 1118 // Override | |
| 1119 void print_tracing_info() const; | |
| 1120 | |
| 1121 // If "addr" is a pointer into the (reserved?) heap, returns a positive | |
| 1122 // number indicating the "arena" within the heap in which "addr" falls. | |
| 1123 // Or else returns 0. | |
| 1124 virtual int addr_to_arena_id(void* addr) const; | |
| 1125 | |
| 1126 // Convenience function to be used in situations where the heap type can be | |
| 1127 // asserted to be this type. | |
| 1128 static G1CollectedHeap* heap(); | |
| 1129 | |
| 1130 void empty_young_list(); | |
| 1131 bool should_set_young_locked(); | |
| 1132 | |
| 1133 void set_region_short_lived_locked(HeapRegion* hr); | |
| 1134 // add appropriate methods for any other surv rate groups | |
| 1135 | |
|
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1136 YoungList* young_list() { return _young_list; } |
| 342 | 1137 |
| 1138 // debugging | |
| 1139 bool check_young_list_well_formed() { | |
| 1140 return _young_list->check_list_well_formed(); | |
| 1141 } | |
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1142 |
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1143 bool check_young_list_empty(bool check_heap, |
| 342 | 1144 bool check_sample = true); |
| 1145 | |
| 1146 // *** Stuff related to concurrent marking. It's not clear to me that so | |
| 1147 // many of these need to be public. | |
| 1148 | |
| 1149 // The functions below are helper functions that a subclass of | |
| 1150 // "CollectedHeap" can use in the implementation of its virtual | |
| 1151 // functions. | |
| 1152 // This performs a concurrent marking of the live objects in a | |
| 1153 // bitmap off to the side. | |
| 1154 void doConcurrentMark(); | |
| 1155 | |
| 1156 // This is called from the marksweep collector which then does | |
| 1157 // a concurrent mark and verifies that the results agree with | |
| 1158 // the stop the world marking. | |
| 1159 void checkConcurrentMark(); | |
| 1160 void do_sync_mark(); | |
| 1161 | |
| 1162 bool isMarkedPrev(oop obj) const; | |
| 1163 bool isMarkedNext(oop obj) const; | |
| 1164 | |
| 811 | 1165 // use_prev_marking == true -> use "prev" marking information, |
| 1166 // use_prev_marking == false -> use "next" marking information | |
| 1167 bool is_obj_dead_cond(const oop obj, | |
| 1168 const HeapRegion* hr, | |
| 1169 const bool use_prev_marking) const { | |
| 1170 if (use_prev_marking) { | |
| 1171 return is_obj_dead(obj, hr); | |
| 1172 } else { | |
| 1173 return is_obj_ill(obj, hr); | |
| 1174 } | |
| 1175 } | |
| 1176 | |
| 342 | 1177 // Determine if an object is dead, given the object and also |
| 1178 // the region to which the object belongs. An object is dead | |
| 1179 // iff a) it was not allocated since the last mark and b) it | |
| 1180 // is not marked. | |
| 1181 | |
| 1182 bool is_obj_dead(const oop obj, const HeapRegion* hr) const { | |
| 1183 return | |
| 1184 !hr->obj_allocated_since_prev_marking(obj) && | |
| 1185 !isMarkedPrev(obj); | |
| 1186 } | |
| 1187 | |
| 1188 // This is used when copying an object to survivor space. | |
| 1189 // If the object is marked live, then we mark the copy live. | |
| 1190 // If the object is allocated since the start of this mark | |
| 1191 // cycle, then we mark the copy live. | |
| 1192 // If the object has been around since the previous mark | |
| 1193 // phase, and hasn't been marked yet during this phase, | |
| 1194 // then we don't mark it, we just wait for the | |
| 1195 // current marking cycle to get to it. | |
| 1196 | |
| 1197 // This function returns true when an object has been | |
| 1198 // around since the previous marking and hasn't yet | |
| 1199 // been marked during this marking. | |
| 1200 | |
| 1201 bool is_obj_ill(const oop obj, const HeapRegion* hr) const { | |
| 1202 return | |
| 1203 !hr->obj_allocated_since_next_marking(obj) && | |
| 1204 !isMarkedNext(obj); | |
| 1205 } | |
| 1206 | |
| 1207 // Determine if an object is dead, given only the object itself. | |
| 1208 // This will find the region to which the object belongs and | |
| 1209 // then call the region version of the same function. | |
| 1210 | |
| 1211 // Added if it is in permanent gen it isn't dead. | |
| 1212 // Added if it is NULL it isn't dead. | |
| 1213 | |
| 811 | 1214 // use_prev_marking == true -> use "prev" marking information, |
| 1215 // use_prev_marking == false -> use "next" marking information | |
| 1216 bool is_obj_dead_cond(const oop obj, | |
| 1217 const bool use_prev_marking) { | |
| 1218 if (use_prev_marking) { | |
| 1219 return is_obj_dead(obj); | |
| 1220 } else { | |
| 1221 return is_obj_ill(obj); | |
| 1222 } | |
| 1223 } | |
| 1224 | |
| 1225 bool is_obj_dead(const oop obj) { | |
| 1226 const HeapRegion* hr = heap_region_containing(obj); | |
| 342 | 1227 if (hr == NULL) { |
| 1228 if (Universe::heap()->is_in_permanent(obj)) | |
| 1229 return false; | |
| 1230 else if (obj == NULL) return false; | |
| 1231 else return true; | |
| 1232 } | |
| 1233 else return is_obj_dead(obj, hr); | |
| 1234 } | |
| 1235 | |
| 811 | 1236 bool is_obj_ill(const oop obj) { |
| 1237 const HeapRegion* hr = heap_region_containing(obj); | |
| 342 | 1238 if (hr == NULL) { |
| 1239 if (Universe::heap()->is_in_permanent(obj)) | |
| 1240 return false; | |
| 1241 else if (obj == NULL) return false; | |
| 1242 else return true; | |
| 1243 } | |
| 1244 else return is_obj_ill(obj, hr); | |
| 1245 } | |
| 1246 | |
| 1247 // The following is just to alert the verification code | |
| 1248 // that a full collection has occurred and that the | |
| 1249 // remembered sets are no longer up to date. | |
| 1250 bool _full_collection; | |
| 1251 void set_full_collection() { _full_collection = true;} | |
| 1252 void clear_full_collection() {_full_collection = false;} | |
| 1253 bool full_collection() {return _full_collection;} | |
| 1254 | |
| 1255 ConcurrentMark* concurrent_mark() const { return _cm; } | |
| 1256 ConcurrentG1Refine* concurrent_g1_refine() const { return _cg1r; } | |
| 1257 | |
|
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1258 // The dirty cards region list is used to record a subset of regions |
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1259 // whose cards need clearing. The list if populated during the |
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1260 // remembered set scanning and drained during the card table |
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1261 // cleanup. Although the methods are reentrant, population/draining |
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1262 // phases must not overlap. For synchronization purposes the last |
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1263 // element on the list points to itself. |
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1264 HeapRegion* _dirty_cards_region_list; |
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1265 void push_dirty_cards_region(HeapRegion* hr); |
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1266 HeapRegion* pop_dirty_cards_region(); |
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1267 |
| 342 | 1268 public: |
| 1269 void stop_conc_gc_threads(); | |
| 1270 | |
| 1271 // <NEW PREDICTION> | |
| 1272 | |
| 1273 double predict_region_elapsed_time_ms(HeapRegion* hr, bool young); | |
| 1274 void check_if_region_is_too_expensive(double predicted_time_ms); | |
| 1275 size_t pending_card_num(); | |
| 1276 size_t max_pending_card_num(); | |
| 1277 size_t cards_scanned(); | |
| 1278 | |
| 1279 // </NEW PREDICTION> | |
| 1280 | |
| 1281 protected: | |
| 1282 size_t _max_heap_capacity; | |
| 1283 | |
| 1284 // debug_only(static void check_for_valid_allocation_state();) | |
| 1285 | |
| 1286 public: | |
| 1287 // Temporary: call to mark things unimplemented for the G1 heap (e.g., | |
| 1288 // MemoryService). In productization, we can make this assert false | |
| 1289 // to catch such places (as well as searching for calls to this...) | |
| 1290 static void g1_unimplemented(); | |
| 1291 | |
| 1292 }; | |
| 1293 | |
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1294 #define use_local_bitmaps 1 |
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1295 #define verify_local_bitmaps 0 |
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1296 #define oop_buffer_length 256 |
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1297 |
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1298 #ifndef PRODUCT |
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1299 class GCLabBitMap; |
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1300 class GCLabBitMapClosure: public BitMapClosure { |
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1301 private: |
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1302 ConcurrentMark* _cm; |
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1303 GCLabBitMap* _bitmap; |
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1304 |
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1305 public: |
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1306 GCLabBitMapClosure(ConcurrentMark* cm, |
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1307 GCLabBitMap* bitmap) { |
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1308 _cm = cm; |
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1309 _bitmap = bitmap; |
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1310 } |
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1311 |
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1312 virtual bool do_bit(size_t offset); |
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1313 }; |
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1314 #endif // !PRODUCT |
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1315 |
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1316 class GCLabBitMap: public BitMap { |
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1317 private: |
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1318 ConcurrentMark* _cm; |
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1319 |
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1320 int _shifter; |
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1321 size_t _bitmap_word_covers_words; |
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1322 |
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1323 // beginning of the heap |
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1324 HeapWord* _heap_start; |
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1325 |
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1326 // this is the actual start of the GCLab |
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1327 HeapWord* _real_start_word; |
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1328 |
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1329 // this is the actual end of the GCLab |
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1330 HeapWord* _real_end_word; |
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1331 |
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1332 // this is the first word, possibly located before the actual start |
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1333 // of the GCLab, that corresponds to the first bit of the bitmap |
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1334 HeapWord* _start_word; |
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1335 |
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1336 // size of a GCLab in words |
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1337 size_t _gclab_word_size; |
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1338 |
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1339 static int shifter() { |
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1340 return MinObjAlignment - 1; |
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1341 } |
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1342 |
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1343 // how many heap words does a single bitmap word corresponds to? |
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1344 static size_t bitmap_word_covers_words() { |
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1345 return BitsPerWord << shifter(); |
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1346 } |
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1347 |
|
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1348 size_t gclab_word_size() const { |
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1349 return _gclab_word_size; |
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1350 } |
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1351 |
|
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1352 // Calculates actual GCLab size in words |
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1353 size_t gclab_real_word_size() const { |
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1354 return bitmap_size_in_bits(pointer_delta(_real_end_word, _start_word)) |
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1355 / BitsPerWord; |
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1356 } |
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1357 |
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1358 static size_t bitmap_size_in_bits(size_t gclab_word_size) { |
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parents:
1313
diff
changeset
|
1359 size_t bits_in_bitmap = gclab_word_size >> shifter(); |
|
845
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parents:
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diff
changeset
|
1360 // We are going to ensure that the beginning of a word in this |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1361 // bitmap also corresponds to the beginning of a word in the |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1362 // global marking bitmap. To handle the case where a GCLab |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1363 // starts from the middle of the bitmap, we need to add enough |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1364 // space (i.e. up to a bitmap word) to ensure that we have |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1365 // enough bits in the bitmap. |
|
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|
1366 return bits_in_bitmap + BitsPerWord - 1; |
|
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|
1367 } |
|
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diff
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|
1368 public: |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1369 GCLabBitMap(HeapWord* heap_start, size_t gclab_word_size) |
|
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
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parents:
1313
diff
changeset
|
1370 : BitMap(bitmap_size_in_bits(gclab_word_size)), |
|
845
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parents:
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diff
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|
1371 _cm(G1CollectedHeap::heap()->concurrent_mark()), |
|
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
changeset
|
1372 _shifter(shifter()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
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|
1373 _bitmap_word_covers_words(bitmap_word_covers_words()), |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
changeset
|
1374 _heap_start(heap_start), |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1375 _gclab_word_size(gclab_word_size), |
|
845
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parents:
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|
1376 _real_start_word(NULL), |
|
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6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
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|
1377 _real_end_word(NULL), |
|
df6caf649ff7
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diff
changeset
|
1378 _start_word(NULL) |
|
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|
1379 { |
|
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
1380 guarantee( size_in_words() >= bitmap_size_in_words(), |
|
df6caf649ff7
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parents:
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diff
changeset
|
1381 "just making sure"); |
|
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diff
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|
1382 } |
|
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|
1383 |
|
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diff
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|
1384 inline unsigned heapWordToOffset(HeapWord* addr) { |
|
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diff
changeset
|
1385 unsigned offset = (unsigned) pointer_delta(addr, _start_word) >> _shifter; |
|
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parents:
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diff
changeset
|
1386 assert(offset < size(), "offset should be within bounds"); |
|
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changeset
|
1387 return offset; |
|
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diff
changeset
|
1388 } |
|
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diff
changeset
|
1389 |
|
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|
1390 inline HeapWord* offsetToHeapWord(size_t offset) { |
|
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|
1391 HeapWord* addr = _start_word + (offset << _shifter); |
|
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|
1392 assert(_real_start_word <= addr && addr < _real_end_word, "invariant"); |
|
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|
1393 return addr; |
|
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|
1394 } |
|
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|
1395 |
|
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|
1396 bool fields_well_formed() { |
|
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diff
changeset
|
1397 bool ret1 = (_real_start_word == NULL) && |
|
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|
1398 (_real_end_word == NULL) && |
|
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|
1399 (_start_word == NULL); |
|
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|
1400 if (ret1) |
|
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|
1401 return true; |
|
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|
1402 |
|
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|
1403 bool ret2 = _real_start_word >= _start_word && |
|
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|
1404 _start_word < _real_end_word && |
|
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|
1405 (_real_start_word + _gclab_word_size) == _real_end_word && |
|
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|
1406 (_start_word + _gclab_word_size + _bitmap_word_covers_words) |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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|
1407 > _real_end_word; |
|
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diff
changeset
|
1408 return ret2; |
|
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parents:
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diff
changeset
|
1409 } |
|
df6caf649ff7
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changeset
|
1410 |
|
df6caf649ff7
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diff
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|
1411 inline bool mark(HeapWord* addr) { |
|
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diff
changeset
|
1412 guarantee(use_local_bitmaps, "invariant"); |
|
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parents:
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diff
changeset
|
1413 assert(fields_well_formed(), "invariant"); |
|
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|
1414 |
|
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1415 if (addr >= _real_start_word && addr < _real_end_word) { |
|
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|
1416 assert(!isMarked(addr), "should not have already been marked"); |
|
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|
1417 |
|
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|
1418 // first mark it on the bitmap |
|
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|
1419 at_put(heapWordToOffset(addr), true); |
|
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|
1420 |
|
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|
1421 return true; |
|
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|
1422 } else { |
|
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|
1423 return false; |
|
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parents:
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|
1424 } |
|
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|
1425 } |
|
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parents:
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|
1426 |
|
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|
1427 inline bool isMarked(HeapWord* addr) { |
|
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|
1428 guarantee(use_local_bitmaps, "invariant"); |
|
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changeset
|
1429 assert(fields_well_formed(), "invariant"); |
|
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|
1430 |
|
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|
1431 return at(heapWordToOffset(addr)); |
|
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|
1432 } |
|
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|
1433 |
|
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|
1434 void set_buffer(HeapWord* start) { |
|
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changeset
|
1435 guarantee(use_local_bitmaps, "invariant"); |
|
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parents:
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|
1436 clear(); |
|
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|
1437 |
|
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changeset
|
1438 assert(start != NULL, "invariant"); |
|
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|
1439 _real_start_word = start; |
|
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|
1440 _real_end_word = start + _gclab_word_size; |
|
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|
1441 |
|
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diff
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|
1442 size_t diff = |
|
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parents:
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changeset
|
1443 pointer_delta(start, _heap_start) % _bitmap_word_covers_words; |
|
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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
|
1444 _start_word = start - diff; |
|
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parents:
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|
1445 |
|
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changeset
|
1446 assert(fields_well_formed(), "invariant"); |
|
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|
1447 } |
|
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|
1448 |
|
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changeset
|
1449 #ifndef PRODUCT |
|
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|
1450 void verify() { |
|
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|
1451 // verify that the marks have been propagated |
|
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diff
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|
1452 GCLabBitMapClosure cl(_cm, this); |
|
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parents:
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diff
changeset
|
1453 iterate(&cl); |
|
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diff
changeset
|
1454 } |
|
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changeset
|
1455 #endif // PRODUCT |
|
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changeset
|
1456 |
|
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parents:
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diff
changeset
|
1457 void retire() { |
|
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changeset
|
1458 guarantee(use_local_bitmaps, "invariant"); |
|
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changeset
|
1459 assert(fields_well_formed(), "invariant"); |
|
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|
1460 |
|
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|
1461 if (_start_word != NULL) { |
|
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|
1462 CMBitMap* mark_bitmap = _cm->nextMarkBitMap(); |
|
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diff
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|
1463 |
|
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diff
changeset
|
1464 // this means that the bitmap was set up for the GCLab |
|
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parents:
838
diff
changeset
|
1465 assert(_real_start_word != NULL && _real_end_word != NULL, "invariant"); |
|
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parents:
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|
1466 |
|
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|
1467 mark_bitmap->mostly_disjoint_range_union(this, |
|
df6caf649ff7
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changeset
|
1468 0, // always start from the start of the bitmap |
|
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diff
changeset
|
1469 _start_word, |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
changeset
|
1470 gclab_real_word_size()); |
|
845
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parents:
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diff
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|
1471 _cm->grayRegionIfNecessary(MemRegion(_real_start_word, _real_end_word)); |
|
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|
1472 |
|
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diff
changeset
|
1473 #ifndef PRODUCT |
|
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|
1474 if (use_local_bitmaps && verify_local_bitmaps) |
|
df6caf649ff7
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parents:
838
diff
changeset
|
1475 verify(); |
|
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parents:
838
diff
changeset
|
1476 #endif // PRODUCT |
|
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parents:
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diff
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|
1477 } else { |
|
df6caf649ff7
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parents:
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diff
changeset
|
1478 assert(_real_start_word == NULL && _real_end_word == NULL, "invariant"); |
|
df6caf649ff7
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parents:
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diff
changeset
|
1479 } |
|
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parents:
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diff
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|
1480 } |
|
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1481 |
|
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|
1482 size_t bitmap_size_in_words() const { |
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1483 return (bitmap_size_in_bits(gclab_word_size()) + BitsPerWord - 1) / BitsPerWord; |
|
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1484 } |
|
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|
1485 |
|
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|
1486 }; |
|
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|
1487 |
|
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|
1488 class G1ParGCAllocBuffer: public ParGCAllocBuffer { |
|
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1489 private: |
|
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|
1490 bool _retired; |
|
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|
1491 bool _during_marking; |
|
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|
1492 GCLabBitMap _bitmap; |
|
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1493 |
|
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1494 public: |
|
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1495 G1ParGCAllocBuffer(size_t gclab_word_size) : |
|
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1496 ParGCAllocBuffer(gclab_word_size), |
|
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1497 _during_marking(G1CollectedHeap::heap()->mark_in_progress()), |
|
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1498 _bitmap(G1CollectedHeap::heap()->reserved_region().start(), gclab_word_size), |
|
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1499 _retired(false) |
|
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1500 { } |
|
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1501 |
|
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|
1502 inline bool mark(HeapWord* addr) { |
|
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1503 guarantee(use_local_bitmaps, "invariant"); |
|
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1504 assert(_during_marking, "invariant"); |
|
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1505 return _bitmap.mark(addr); |
|
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1506 } |
|
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1507 |
|
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1508 inline void set_buf(HeapWord* buf) { |
|
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1509 if (use_local_bitmaps && _during_marking) |
|
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|
1510 _bitmap.set_buffer(buf); |
|
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|
1511 ParGCAllocBuffer::set_buf(buf); |
|
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|
1512 _retired = false; |
|
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|
1513 } |
|
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|
1514 |
|
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|
1515 inline void retire(bool end_of_gc, bool retain) { |
|
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|
1516 if (_retired) |
|
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|
1517 return; |
|
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|
1518 if (use_local_bitmaps && _during_marking) { |
|
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|
1519 _bitmap.retire(); |
|
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|
1520 } |
|
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|
1521 ParGCAllocBuffer::retire(end_of_gc, retain); |
|
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|
1522 _retired = true; |
|
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|
1523 } |
|
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|
1524 }; |
|
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|
1525 |
|
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|
1526 class G1ParScanThreadState : public StackObj { |
|
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|
1527 protected: |
|
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|
1528 G1CollectedHeap* _g1h; |
|
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|
1529 RefToScanQueue* _refs; |
|
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|
1530 DirtyCardQueue _dcq; |
|
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|
1531 CardTableModRefBS* _ct_bs; |
|
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|
1532 G1RemSet* _g1_rem; |
|
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|
1533 |
|
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|
1534 typedef GrowableArray<StarTask> OverflowQueue; |
|
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|
1535 OverflowQueue* _overflowed_refs; |
|
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|
1536 |
|
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|
1537 G1ParGCAllocBuffer _surviving_alloc_buffer; |
|
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|
1538 G1ParGCAllocBuffer _tenured_alloc_buffer; |
|
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|
1539 G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount]; |
|
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|
1540 ageTable _age_table; |
|
845
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|
1541 |
|
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|
1542 size_t _alloc_buffer_waste; |
|
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|
1543 size_t _undo_waste; |
|
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|
1544 |
|
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diff
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|
1545 OopsInHeapRegionClosure* _evac_failure_cl; |
|
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|
1546 G1ParScanHeapEvacClosure* _evac_cl; |
|
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|
1547 G1ParScanPartialArrayClosure* _partial_scan_cl; |
|
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|
1548 |
|
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diff
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|
1549 int _hash_seed; |
|
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diff
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|
1550 int _queue_num; |
|
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|
1551 |
|
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|
1552 int _term_attempts; |
|
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|
1553 #if G1_DETAILED_STATS |
|
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|
1554 int _pushes, _pops, _steals, _steal_attempts; |
|
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|
1555 int _overflow_pushes; |
|
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diff
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|
1556 #endif |
|
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838
diff
changeset
|
1557 |
|
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diff
changeset
|
1558 double _start; |
|
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diff
changeset
|
1559 double _start_strong_roots; |
|
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diff
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|
1560 double _strong_roots_time; |
|
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diff
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|
1561 double _start_term; |
|
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diff
changeset
|
1562 double _term_time; |
|
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diff
changeset
|
1563 |
|
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diff
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|
1564 // Map from young-age-index (0 == not young, 1 is youngest) to |
|
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|
1565 // surviving words. base is what we get back from the malloc call |
|
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|
1566 size_t* _surviving_young_words_base; |
|
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|
1567 // this points into the array, as we use the first few entries for padding |
|
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|
1568 size_t* _surviving_young_words; |
|
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|
1569 |
|
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|
1570 #define PADDING_ELEM_NUM (64 / sizeof(size_t)) |
|
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|
1571 |
|
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|
1572 void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; } |
|
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|
1573 |
|
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|
1574 void add_to_undo_waste(size_t waste) { _undo_waste += waste; } |
|
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|
1575 |
|
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|
1576 DirtyCardQueue& dirty_card_queue() { return _dcq; } |
|
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|
1577 CardTableModRefBS* ctbs() { return _ct_bs; } |
|
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|
1578 |
|
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|
1579 template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) { |
|
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|
1580 if (!from->is_survivor()) { |
|
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|
1581 _g1_rem->par_write_ref(from, p, tid); |
|
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|
1582 } |
|
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|
1583 } |
|
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|
1584 |
|
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|
1585 template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) { |
|
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|
1586 // If the new value of the field points to the same region or |
|
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|
1587 // is the to-space, we don't need to include it in the Rset updates. |
|
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|
1588 if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) { |
|
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|
1589 size_t card_index = ctbs()->index_for(p); |
|
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changeset
|
1590 // If the card hasn't been added to the buffer, do it. |
|
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|
1591 if (ctbs()->mark_card_deferred(card_index)) { |
|
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changeset
|
1592 dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index)); |
|
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diff
changeset
|
1593 } |
|
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diff
changeset
|
1594 } |
|
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diff
changeset
|
1595 } |
|
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diff
changeset
|
1596 |
|
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parents:
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diff
changeset
|
1597 public: |
|
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|
1598 G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num); |
|
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|
1599 |
|
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|
1600 ~G1ParScanThreadState() { |
|
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1601 FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base); |
|
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1602 } |
|
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1603 |
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1604 RefToScanQueue* refs() { return _refs; } |
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1605 OverflowQueue* overflowed_refs() { return _overflowed_refs; } |
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1606 ageTable* age_table() { return &_age_table; } |
|
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|
1607 |
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|
1608 G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) { |
|
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1609 return _alloc_buffers[purpose]; |
|
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1610 } |
|
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|
1611 |
|
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|
1612 size_t alloc_buffer_waste() { return _alloc_buffer_waste; } |
|
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|
1613 size_t undo_waste() { return _undo_waste; } |
|
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|
1614 |
|
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|
1615 template <class T> void push_on_queue(T* ref) { |
|
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|
1616 assert(ref != NULL, "invariant"); |
|
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|
1617 assert(has_partial_array_mask(ref) || |
|
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|
1618 _g1h->is_in_g1_reserved(oopDesc::load_decode_heap_oop(ref)), "invariant"); |
|
845
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|
1619 #ifdef ASSERT |
|
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|
1620 if (has_partial_array_mask(ref)) { |
|
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|
1621 oop p = clear_partial_array_mask(ref); |
|
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|
1622 // Verify that we point into the CS |
|
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|
1623 assert(_g1h->obj_in_cs(p), "Should be in CS"); |
|
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|
1624 } |
|
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|
1625 #endif |
|
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|
1626 if (!refs()->push(ref)) { |
|
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|
1627 overflowed_refs()->push(ref); |
|
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|
1628 IF_G1_DETAILED_STATS(note_overflow_push()); |
|
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|
1629 } else { |
|
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|
1630 IF_G1_DETAILED_STATS(note_push()); |
|
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|
1631 } |
|
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|
1632 } |
|
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|
1633 |
|
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|
1634 void pop_from_queue(StarTask& ref) { |
|
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|
1635 if (refs()->pop_local(ref)) { |
|
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|
1636 assert((oop*)ref != NULL, "pop_local() returned true"); |
|
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|
1637 assert(UseCompressedOops || !ref.is_narrow(), "Error"); |
|
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|
1638 assert(has_partial_array_mask((oop*)ref) || |
|
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|
1639 _g1h->is_in_g1_reserved(ref.is_narrow() ? oopDesc::load_decode_heap_oop((narrowOop*)ref) |
|
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|
1640 : oopDesc::load_decode_heap_oop((oop*)ref)), |
|
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|
1641 "invariant"); |
|
845
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|
1642 IF_G1_DETAILED_STATS(note_pop()); |
|
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|
1643 } else { |
|
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|
1644 StarTask null_task; |
|
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|
1645 ref = null_task; |
|
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|
1646 } |
|
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|
1647 } |
|
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|
1648 |
|
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|
1649 void pop_from_overflow_queue(StarTask& ref) { |
|
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|
1650 StarTask new_ref = overflowed_refs()->pop(); |
|
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|
1651 assert((oop*)new_ref != NULL, "pop() from a local non-empty stack"); |
|
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|
1652 assert(UseCompressedOops || !new_ref.is_narrow(), "Error"); |
|
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|
1653 assert(has_partial_array_mask((oop*)new_ref) || |
|
1261
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|
1654 _g1h->is_in_g1_reserved(new_ref.is_narrow() ? oopDesc::load_decode_heap_oop((narrowOop*)new_ref) |
|
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|
1655 : oopDesc::load_decode_heap_oop((oop*)new_ref)), |
|
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|
1656 "invariant"); |
|
845
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|
1657 ref = new_ref; |
|
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|
1658 } |
|
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|
1659 |
|
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|
1660 int refs_to_scan() { return refs()->size(); } |
|
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|
1661 int overflowed_refs_to_scan() { return overflowed_refs()->length(); } |
|
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|
1662 |
|
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|
1663 template <class T> void update_rs(HeapRegion* from, T* p, int tid) { |
|
df6caf649ff7
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|
1664 if (G1DeferredRSUpdate) { |
|
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|
1665 deferred_rs_update(from, p, tid); |
|
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|
1666 } else { |
|
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|
1667 immediate_rs_update(from, p, tid); |
|
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|
1668 } |
|
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|
1669 } |
|
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|
1670 |
|
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|
1671 HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) { |
|
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|
1672 |
|
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|
1673 HeapWord* obj = NULL; |
|
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|
1674 size_t gclab_word_size = _g1h->desired_plab_sz(purpose); |
|
79e419e5ea3b
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|
1675 if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) { |
|
845
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|
1676 G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose); |
|
1391
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|
1677 assert(gclab_word_size == alloc_buf->word_sz(), |
|
79e419e5ea3b
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|
1678 "dynamic resizing is not supported"); |
|
845
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|
1679 add_to_alloc_buffer_waste(alloc_buf->words_remaining()); |
|
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|
1680 alloc_buf->retire(false, false); |
|
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|
1681 |
|
1391
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apetrusenko
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1313
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|
1682 HeapWord* buf = _g1h->par_allocate_during_gc(purpose, gclab_word_size); |
|
845
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|
1683 if (buf == NULL) return NULL; // Let caller handle allocation failure. |
|
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|
1684 // Otherwise. |
|
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|
1685 alloc_buf->set_buf(buf); |
|
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|
1686 |
|
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|
1687 obj = alloc_buf->allocate(word_sz); |
|
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|
1688 assert(obj != NULL, "buffer was definitely big enough..."); |
|
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|
1689 } else { |
|
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|
1690 obj = _g1h->par_allocate_during_gc(purpose, word_sz); |
|
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|
1691 } |
|
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|
1692 return obj; |
|
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|
1693 } |
|
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|
1694 |
|
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|
1695 HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) { |
|
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|
1696 HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz); |
|
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|
1697 if (obj != NULL) return obj; |
|
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|
1698 return allocate_slow(purpose, word_sz); |
|
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|
1699 } |
|
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|
1700 |
|
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|
1701 void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) { |
|
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|
1702 if (alloc_buffer(purpose)->contains(obj)) { |
|
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|
1703 assert(alloc_buffer(purpose)->contains(obj + word_sz - 1), |
|
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|
1704 "should contain whole object"); |
|
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changeset
|
1705 alloc_buffer(purpose)->undo_allocation(obj, word_sz); |
|
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|
1706 } else { |
|
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|
1707 CollectedHeap::fill_with_object(obj, word_sz); |
|
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|
1708 add_to_undo_waste(word_sz); |
|
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|
1709 } |
|
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|
1710 } |
|
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|
1711 |
|
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|
1712 void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) { |
|
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|
1713 _evac_failure_cl = evac_failure_cl; |
|
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|
1714 } |
|
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changeset
|
1715 OopsInHeapRegionClosure* evac_failure_closure() { |
|
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|
1716 return _evac_failure_cl; |
|
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diff
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|
1717 } |
|
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|
1718 |
|
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|
1719 void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) { |
|
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|
1720 _evac_cl = evac_cl; |
|
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|
1721 } |
|
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|
1722 |
|
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|
1723 void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) { |
|
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
1724 _partial_scan_cl = partial_scan_cl; |
|
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|
1725 } |
|
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diff
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|
1726 |
|
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parents:
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diff
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|
1727 int* hash_seed() { return &_hash_seed; } |
|
df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
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parents:
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diff
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|
1728 int queue_num() { return _queue_num; } |
|
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6700789: G1: Enable use of compressed oops with G1 heaps
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diff
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|
1729 |
|
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|
1730 int term_attempts() { return _term_attempts; } |
|
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6700789: G1: Enable use of compressed oops with G1 heaps
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|
1731 void note_term_attempt() { _term_attempts++; } |
|
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|
1732 |
|
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|
1733 #if G1_DETAILED_STATS |
|
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parents:
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|
1734 int pushes() { return _pushes; } |
|
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|
1735 int pops() { return _pops; } |
|
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|
1736 int steals() { return _steals; } |
|
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|
1737 int steal_attempts() { return _steal_attempts; } |
|
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|
1738 int overflow_pushes() { return _overflow_pushes; } |
|
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|
1739 |
|
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|
1740 void note_push() { _pushes++; } |
|
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|
1741 void note_pop() { _pops++; } |
|
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|
1742 void note_steal() { _steals++; } |
|
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|
1743 void note_steal_attempt() { _steal_attempts++; } |
|
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|
1744 void note_overflow_push() { _overflow_pushes++; } |
|
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|
1745 #endif |
|
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|
1746 |
|
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|
1747 void start_strong_roots() { |
|
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|
1748 _start_strong_roots = os::elapsedTime(); |
|
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|
1749 } |
|
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|
1750 void end_strong_roots() { |
|
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|
1751 _strong_roots_time += (os::elapsedTime() - _start_strong_roots); |
|
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|
1752 } |
|
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|
1753 double strong_roots_time() { return _strong_roots_time; } |
|
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|
1754 |
|
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|
1755 void start_term_time() { |
|
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|
1756 note_term_attempt(); |
|
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|
1757 _start_term = os::elapsedTime(); |
|
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|
1758 } |
|
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|
1759 void end_term_time() { |
|
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|
1760 _term_time += (os::elapsedTime() - _start_term); |
|
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|
1761 } |
|
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|
1762 double term_time() { return _term_time; } |
|
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|
1763 |
|
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|
1764 double elapsed() { |
|
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|
1765 return os::elapsedTime() - _start; |
|
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|
1766 } |
|
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|
1767 |
|
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|
1768 size_t* surviving_young_words() { |
|
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|
1769 // We add on to hide entry 0 which accumulates surviving words for |
|
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|
1770 // age -1 regions (i.e. non-young ones) |
|
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|
1771 return _surviving_young_words; |
|
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|
1772 } |
|
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|
1773 |
|
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|
1774 void retire_alloc_buffers() { |
|
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|
1775 for (int ap = 0; ap < GCAllocPurposeCount; ++ap) { |
|
1391
79e419e5ea3b
6942253: G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize
apetrusenko
parents:
1313
diff
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|
1776 size_t waste = _alloc_buffers[ap]->words_remaining(); |
|
845
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|
1777 add_to_alloc_buffer_waste(waste); |
|
1391
79e419e5ea3b
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|
1778 _alloc_buffers[ap]->retire(true, false); |
|
845
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|
1779 } |
|
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|
1780 } |
|
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|
1781 |
|
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|
1782 private: |
|
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|
1783 template <class T> void deal_with_reference(T* ref_to_scan) { |
|
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|
1784 if (has_partial_array_mask(ref_to_scan)) { |
|
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|
1785 _partial_scan_cl->do_oop_nv(ref_to_scan); |
|
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|
1786 } else { |
|
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|
1787 // Note: we can use "raw" versions of "region_containing" because |
|
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|
1788 // "obj_to_scan" is definitely in the heap, and is not in a |
|
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|
1789 // humongous region. |
|
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|
1790 HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan); |
|
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|
1791 _evac_cl->set_region(r); |
|
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|
1792 _evac_cl->do_oop_nv(ref_to_scan); |
|
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|
1793 } |
|
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|
1794 } |
|
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|
1795 |
|
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|
1796 public: |
|
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|
1797 void trim_queue() { |
|
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|
1798 // I've replicated the loop twice, first to drain the overflow |
|
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|
1799 // queue, second to drain the task queue. This is better than |
|
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|
1800 // having a single loop, which checks both conditions and, inside |
|
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|
1801 // it, either pops the overflow queue or the task queue, as each |
|
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|
1802 // loop is tighter. Also, the decision to drain the overflow queue |
|
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|
1803 // first is not arbitrary, as the overflow queue is not visible |
|
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|
1804 // to the other workers, whereas the task queue is. So, we want to |
|
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|
1805 // drain the "invisible" entries first, while allowing the other |
|
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|
1806 // workers to potentially steal the "visible" entries. |
|
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|
1807 |
|
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|
1808 while (refs_to_scan() > 0 || overflowed_refs_to_scan() > 0) { |
|
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|
1809 while (overflowed_refs_to_scan() > 0) { |
|
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|
1810 StarTask ref_to_scan; |
|
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|
1811 assert((oop*)ref_to_scan == NULL, "Constructed above"); |
|
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|
1812 pop_from_overflow_queue(ref_to_scan); |
|
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|
1813 // We shouldn't have pushed it on the queue if it was not |
|
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|
1814 // pointing into the CSet. |
|
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|
1815 assert((oop*)ref_to_scan != NULL, "Follows from inner loop invariant"); |
|
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|
1816 if (ref_to_scan.is_narrow()) { |
|
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|
1817 assert(UseCompressedOops, "Error"); |
|
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|
1818 narrowOop* p = (narrowOop*)ref_to_scan; |
|
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|
1819 assert(!has_partial_array_mask(p) && |
|
1261
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diff
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|
1820 _g1h->is_in_g1_reserved(oopDesc::load_decode_heap_oop(p)), "sanity"); |
|
845
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|
1821 deal_with_reference(p); |
|
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|
1822 } else { |
|
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|
1823 oop* p = (oop*)ref_to_scan; |
|
1261
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parents:
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diff
changeset
|
1824 assert((has_partial_array_mask(p) && _g1h->is_in_g1_reserved(clear_partial_array_mask(p))) || |
|
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diff
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|
1825 _g1h->is_in_g1_reserved(oopDesc::load_decode_heap_oop(p)), "sanity"); |
|
845
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|
1826 deal_with_reference(p); |
|
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|
1827 } |
|
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|
1828 } |
|
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|
1829 |
|
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|
1830 while (refs_to_scan() > 0) { |
|
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|
1831 StarTask ref_to_scan; |
|
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|
1832 assert((oop*)ref_to_scan == NULL, "Constructed above"); |
|
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|
1833 pop_from_queue(ref_to_scan); |
|
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|
1834 if ((oop*)ref_to_scan != NULL) { |
|
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|
1835 if (ref_to_scan.is_narrow()) { |
|
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1836 assert(UseCompressedOops, "Error"); |
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1837 narrowOop* p = (narrowOop*)ref_to_scan; |
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1838 assert(!has_partial_array_mask(p) && |
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1839 _g1h->is_in_g1_reserved(oopDesc::load_decode_heap_oop(p)), "sanity"); |
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845
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1840 deal_with_reference(p); |
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1841 } else { |
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1842 oop* p = (oop*)ref_to_scan; |
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1843 assert((has_partial_array_mask(p) && _g1h->obj_in_cs(clear_partial_array_mask(p))) || |
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1844 _g1h->is_in_g1_reserved(oopDesc::load_decode_heap_oop(p)), "sanity"); |
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1845 deal_with_reference(p); |
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1846 } |
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1847 } |
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1848 } |
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1849 } |
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1850 } |
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1851 }; |