Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.hpp @ 17524:89152779163c
Merge with jdk8-b132
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 11:59:32 +0200 |
| parents | 4ca6dc0799b6 |
| children | 52b4284cb496 |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 17524 | 2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONREMSET_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONREMSET_HPP | |
| 27 | |
| 28 #include "gc_implementation/g1/sparsePRT.hpp" | |
| 29 | |
| 342 | 30 // Remembered set for a heap region. Represent a set of "cards" that |
| 31 // contain pointers into the owner heap region. Cards are defined somewhat | |
| 32 // abstractly, in terms of what the "BlockOffsetTable" in use can parse. | |
| 33 | |
| 34 class G1CollectedHeap; | |
| 35 class G1BlockOffsetSharedArray; | |
| 36 class HeapRegion; | |
| 37 class HeapRegionRemSetIterator; | |
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38 class PerRegionTable; |
| 342 | 39 class SparsePRT; |
| 12080 | 40 class nmethod; |
| 342 | 41 |
| 2173 | 42 // Essentially a wrapper around SparsePRTCleanupTask. See |
| 43 // sparsePRT.hpp for more details. | |
| 44 class HRRSCleanupTask : public SparsePRTCleanupTask { | |
| 45 }; | |
| 342 | 46 |
| 47 // The "_coarse_map" is a bitmap with one bit for each region, where set | |
| 48 // bits indicate that the corresponding region may contain some pointer | |
| 49 // into the owning region. | |
| 50 | |
| 51 // The "_fine_grain_entries" array is an open hash table of PerRegionTables | |
| 52 // (PRTs), indicating regions for which we're keeping the RS as a set of | |
| 53 // cards. The strategy is to cap the size of the fine-grain table, | |
| 54 // deleting an entry and setting the corresponding coarse-grained bit when | |
| 55 // we would overflow this cap. | |
| 56 | |
| 57 // We use a mixture of locking and lock-free techniques here. We allow | |
| 58 // threads to locate PRTs without locking, but threads attempting to alter | |
| 59 // a bucket list obtain a lock. This means that any failing attempt to | |
| 60 // find a PRT must be retried with the lock. It might seem dangerous that | |
| 61 // a read can find a PRT that is concurrently deleted. This is all right, | |
| 62 // because: | |
| 63 // | |
| 64 // 1) We only actually free PRT's at safe points (though we reuse them at | |
| 65 // other times). | |
| 66 // 2) We find PRT's in an attempt to add entries. If a PRT is deleted, | |
| 67 // it's _coarse_map bit is set, so the that we were attempting to add | |
| 68 // is represented. If a deleted PRT is re-used, a thread adding a bit, | |
| 69 // thinking the PRT is for a different region, does no harm. | |
| 70 | |
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71 class OtherRegionsTable VALUE_OBJ_CLASS_SPEC { |
| 342 | 72 friend class HeapRegionRemSetIterator; |
| 73 | |
| 74 G1CollectedHeap* _g1h; | |
| 75 Mutex _m; | |
| 76 HeapRegion* _hr; | |
| 77 | |
| 78 // These are protected by "_m". | |
| 79 BitMap _coarse_map; | |
| 80 size_t _n_coarse_entries; | |
| 81 static jint _n_coarsenings; | |
| 82 | |
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83 PerRegionTable** _fine_grain_regions; |
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84 size_t _n_fine_entries; |
| 342 | 85 |
| 6253 | 86 // The fine grain remembered sets are doubly linked together using |
| 87 // their 'next' and 'prev' fields. | |
| 88 // This allows fast bulk freeing of all the fine grain remembered | |
| 89 // set entries, and fast finding of all of them without iterating | |
| 90 // over the _fine_grain_regions table. | |
| 91 PerRegionTable * _first_all_fine_prts; | |
| 92 PerRegionTable * _last_all_fine_prts; | |
| 93 | |
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94 // Used to sample a subset of the fine grain PRTs to determine which |
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95 // PRT to evict and coarsen. |
| 342 | 96 size_t _fine_eviction_start; |
| 97 static size_t _fine_eviction_stride; | |
| 98 static size_t _fine_eviction_sample_size; | |
| 99 | |
| 100 SparsePRT _sparse_table; | |
| 101 | |
| 102 // These are static after init. | |
| 103 static size_t _max_fine_entries; | |
| 104 static size_t _mod_max_fine_entries_mask; | |
| 105 | |
| 106 // Requires "prt" to be the first element of the bucket list appropriate | |
| 107 // for "hr". If this list contains an entry for "hr", return it, | |
| 108 // otherwise return "NULL". | |
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109 PerRegionTable* find_region_table(size_t ind, HeapRegion* hr) const; |
| 342 | 110 |
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111 // Find, delete, and return a candidate PerRegionTable, if any exists, |
| 342 | 112 // adding the deleted region to the coarse bitmap. Requires the caller |
| 113 // to hold _m, and the fine-grain table to be full. | |
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114 PerRegionTable* delete_region_table(); |
| 342 | 115 |
| 116 // If a PRT for "hr" is in the bucket list indicated by "ind" (which must | |
| 117 // be the correct index for "hr"), delete it and return true; else return | |
| 118 // false. | |
| 119 bool del_single_region_table(size_t ind, HeapRegion* hr); | |
| 120 | |
| 121 // Indexed by thread X heap region, to minimize thread contention. | |
| 122 static int** _from_card_cache; | |
| 123 static size_t _from_card_cache_max_regions; | |
| 124 static size_t _from_card_cache_mem_size; | |
| 125 | |
| 6253 | 126 // link/add the given fine grain remembered set into the "all" list |
| 127 void link_to_all(PerRegionTable * prt); | |
| 128 // unlink/remove the given fine grain remembered set into the "all" list | |
| 129 void unlink_from_all(PerRegionTable * prt); | |
| 130 | |
| 342 | 131 public: |
| 132 OtherRegionsTable(HeapRegion* hr); | |
| 133 | |
| 134 HeapRegion* hr() const { return _hr; } | |
| 135 | |
| 136 // For now. Could "expand" some tables in the future, so that this made | |
| 137 // sense. | |
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138 void add_reference(OopOrNarrowOopStar from, int tid); |
| 342 | 139 |
| 140 // Removes any entries shown by the given bitmaps to contain only dead | |
| 141 // objects. | |
| 142 void scrub(CardTableModRefBS* ctbs, BitMap* region_bm, BitMap* card_bm); | |
| 143 | |
| 144 // Not const because it takes a lock. | |
| 145 size_t occupied() const; | |
| 146 size_t occ_fine() const; | |
| 147 size_t occ_coarse() const; | |
| 148 size_t occ_sparse() const; | |
| 149 | |
| 150 static jint n_coarsenings() { return _n_coarsenings; } | |
| 151 | |
| 152 // Returns size in bytes. | |
| 153 // Not const because it takes a lock. | |
| 154 size_t mem_size() const; | |
| 155 static size_t static_mem_size(); | |
| 156 static size_t fl_mem_size(); | |
| 157 | |
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158 bool contains_reference(OopOrNarrowOopStar from) const; |
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159 bool contains_reference_locked(OopOrNarrowOopStar from) const; |
| 342 | 160 |
| 161 void clear(); | |
| 162 | |
| 163 // Specifically clear the from_card_cache. | |
| 164 void clear_fcc(); | |
| 165 | |
| 166 // "from_hr" is being cleared; remove any entries from it. | |
| 167 void clear_incoming_entry(HeapRegion* from_hr); | |
| 168 | |
| 2173 | 169 void do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task); |
| 170 | |
| 342 | 171 // Declare the heap size (in # of regions) to the OtherRegionsTable. |
| 172 // (Uses it to initialize from_card_cache). | |
| 173 static void init_from_card_cache(size_t max_regions); | |
| 174 | |
| 175 // Declares that only regions i s.t. 0 <= i < new_n_regs are in use. | |
| 176 // Make sure any entries for higher regions are invalid. | |
| 177 static void shrink_from_card_cache(size_t new_n_regs); | |
| 178 | |
| 179 static void print_from_card_cache(); | |
| 180 }; | |
| 181 | |
| 6197 | 182 class HeapRegionRemSet : public CHeapObj<mtGC> { |
| 342 | 183 friend class VMStructs; |
| 184 friend class HeapRegionRemSetIterator; | |
| 185 | |
| 186 public: | |
| 187 enum Event { | |
| 188 Event_EvacStart, Event_EvacEnd, Event_RSUpdateEnd | |
| 189 }; | |
| 190 | |
| 191 private: | |
| 192 G1BlockOffsetSharedArray* _bosa; | |
| 193 G1BlockOffsetSharedArray* bosa() const { return _bosa; } | |
| 194 | |
| 12080 | 195 // A list of code blobs (nmethods) whose code contains pointers into |
| 196 // the region that owns this RSet. | |
| 197 GrowableArray<nmethod*>* _strong_code_roots_list; | |
| 198 | |
| 342 | 199 OtherRegionsTable _other_regions; |
| 200 | |
| 201 enum ParIterState { Unclaimed, Claimed, Complete }; | |
| 1261 | 202 volatile ParIterState _iter_state; |
| 203 volatile jlong _iter_claimed; | |
| 342 | 204 |
| 205 // Unused unless G1RecordHRRSOops is true. | |
| 206 | |
| 207 static const int MaxRecorded = 1000000; | |
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208 static OopOrNarrowOopStar* _recorded_oops; |
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209 static HeapWord** _recorded_cards; |
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210 static HeapRegion** _recorded_regions; |
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211 static int _n_recorded; |
| 342 | 212 |
| 213 static const int MaxRecordedEvents = 1000; | |
| 214 static Event* _recorded_events; | |
| 215 static int* _recorded_event_index; | |
| 216 static int _n_recorded_events; | |
| 217 | |
| 218 static void print_event(outputStream* str, Event evnt); | |
| 219 | |
| 220 public: | |
| 221 HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, | |
| 222 HeapRegion* hr); | |
| 223 | |
| 224 static int num_par_rem_sets(); | |
| 1261 | 225 static void setup_remset_size(); |
| 342 | 226 |
| 227 HeapRegion* hr() const { | |
| 228 return _other_regions.hr(); | |
| 229 } | |
| 230 | |
| 231 size_t occupied() const { | |
| 232 return _other_regions.occupied(); | |
| 233 } | |
| 234 size_t occ_fine() const { | |
| 235 return _other_regions.occ_fine(); | |
| 236 } | |
| 237 size_t occ_coarse() const { | |
| 238 return _other_regions.occ_coarse(); | |
| 239 } | |
| 240 size_t occ_sparse() const { | |
| 241 return _other_regions.occ_sparse(); | |
| 242 } | |
| 243 | |
| 244 static jint n_coarsenings() { return OtherRegionsTable::n_coarsenings(); } | |
| 245 | |
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246 // Used in the sequential case. |
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247 void add_reference(OopOrNarrowOopStar from) { |
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248 _other_regions.add_reference(from, 0); |
| 342 | 249 } |
| 250 | |
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251 // Used in the parallel case. |
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252 void add_reference(OopOrNarrowOopStar from, int tid) { |
| 342 | 253 _other_regions.add_reference(from, tid); |
| 254 } | |
| 255 | |
| 256 // Removes any entries shown by the given bitmaps to contain only dead | |
| 257 // objects. | |
| 258 void scrub(CardTableModRefBS* ctbs, BitMap* region_bm, BitMap* card_bm); | |
| 259 | |
| 260 // The region is being reclaimed; clear its remset, and any mention of | |
| 261 // entries for this region in other remsets. | |
| 262 void clear(); | |
| 263 | |
| 264 // Attempt to claim the region. Returns true iff this call caused an | |
| 265 // atomic transition from Unclaimed to Claimed. | |
| 266 bool claim_iter(); | |
| 267 // Sets the iteration state to "complete". | |
| 268 void set_iter_complete(); | |
| 269 // Returns "true" iff the region's iteration is complete. | |
| 270 bool iter_is_complete(); | |
| 271 | |
| 1261 | 272 // Support for claiming blocks of cards during iteration |
| 273 size_t iter_claimed() const { return (size_t)_iter_claimed; } | |
| 274 // Claim the next block of cards | |
| 275 size_t iter_claimed_next(size_t step) { | |
| 276 size_t current, next; | |
| 277 do { | |
| 278 current = iter_claimed(); | |
| 279 next = current + step; | |
| 280 } while (Atomic::cmpxchg((jlong)next, &_iter_claimed, (jlong)current) != (jlong)current); | |
| 281 return current; | |
| 282 } | |
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283 void reset_for_par_iteration(); |
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284 |
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285 bool verify_ready_for_par_iteration() { |
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286 return (_iter_state == Unclaimed) && (_iter_claimed == 0); |
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287 } |
| 1261 | 288 |
| 342 | 289 // The actual # of bytes this hr_remset takes up. |
| 12080 | 290 // Note also includes the strong code root set. |
| 342 | 291 size_t mem_size() { |
| 292 return _other_regions.mem_size() | |
| 293 // This correction is necessary because the above includes the second | |
| 294 // part. | |
| 12080 | 295 + (sizeof(this) - sizeof(OtherRegionsTable)) |
| 296 + strong_code_roots_mem_size(); | |
| 342 | 297 } |
| 298 | |
| 299 // Returns the memory occupancy of all static data structures associated | |
| 300 // with remembered sets. | |
| 301 static size_t static_mem_size() { | |
| 302 return OtherRegionsTable::static_mem_size(); | |
| 303 } | |
| 304 | |
| 305 // Returns the memory occupancy of all free_list data structures associated | |
| 306 // with remembered sets. | |
| 307 static size_t fl_mem_size() { | |
| 308 return OtherRegionsTable::fl_mem_size(); | |
| 309 } | |
| 310 | |
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311 bool contains_reference(OopOrNarrowOopStar from) const { |
| 342 | 312 return _other_regions.contains_reference(from); |
| 313 } | |
| 12080 | 314 |
| 315 // Routines for managing the list of code roots that point into | |
| 316 // the heap region that owns this RSet. | |
| 317 void add_strong_code_root(nmethod* nm); | |
| 318 void remove_strong_code_root(nmethod* nm); | |
| 319 | |
| 320 // During a collection, migrate the successfully evacuated strong | |
| 321 // code roots that referenced into the region that owns this RSet | |
| 322 // to the RSets of the new regions that they now point into. | |
| 323 // Unsuccessfully evacuated code roots are not migrated. | |
| 324 void migrate_strong_code_roots(); | |
| 325 | |
| 326 // Applies blk->do_code_blob() to each of the entries in | |
| 327 // the strong code roots list | |
| 328 void strong_code_roots_do(CodeBlobClosure* blk) const; | |
| 329 | |
| 330 // Returns the number of elements in the strong code roots list | |
| 331 int strong_code_roots_list_length() { | |
| 332 return _strong_code_roots_list->length(); | |
| 333 } | |
| 334 | |
| 335 // Returns true if the strong code roots contains the given | |
| 336 // nmethod. | |
| 337 bool strong_code_roots_list_contains(nmethod* nm) { | |
| 338 return _strong_code_roots_list->contains(nm); | |
| 339 } | |
| 340 | |
| 341 // Returns the amount of memory, in bytes, currently | |
| 342 // consumed by the strong code roots. | |
| 343 size_t strong_code_roots_mem_size(); | |
| 344 | |
| 342 | 345 void print() const; |
| 346 | |
| 347 // Called during a stop-world phase to perform any deferred cleanups. | |
| 348 static void cleanup(); | |
| 349 | |
| 350 // Declare the heap size (in # of regions) to the HeapRegionRemSet(s). | |
| 351 // (Uses it to initialize from_card_cache). | |
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352 static void init_heap(uint max_regions) { |
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353 OtherRegionsTable::init_from_card_cache((size_t) max_regions); |
| 342 | 354 } |
| 355 | |
| 356 // Declares that only regions i s.t. 0 <= i < new_n_regs are in use. | |
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357 static void shrink_heap(uint new_n_regs) { |
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358 OtherRegionsTable::shrink_from_card_cache((size_t) new_n_regs); |
| 342 | 359 } |
| 360 | |
| 361 #ifndef PRODUCT | |
| 362 static void print_from_card_cache() { | |
| 363 OtherRegionsTable::print_from_card_cache(); | |
| 364 } | |
| 365 #endif | |
| 366 | |
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367 static void record(HeapRegion* hr, OopOrNarrowOopStar f); |
| 342 | 368 static void print_recorded(); |
| 369 static void record_event(Event evnt); | |
| 370 | |
| 2173 | 371 // These are wrappers for the similarly-named methods on |
| 372 // SparsePRT. Look at sparsePRT.hpp for more details. | |
| 373 static void reset_for_cleanup_tasks(); | |
| 374 void do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task); | |
| 375 static void finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task); | |
| 376 | |
| 342 | 377 // Run unit tests. |
| 378 #ifndef PRODUCT | |
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379 static void test_prt(); |
| 342 | 380 static void test(); |
| 381 #endif | |
| 382 }; | |
| 383 | |
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384 class HeapRegionRemSetIterator : public StackObj { |
| 342 | 385 |
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386 // The region RSet over which we're iterating. |
| 342 | 387 const HeapRegionRemSet* _hrrs; |
| 388 | |
| 389 // Local caching of HRRS fields. | |
| 390 const BitMap* _coarse_map; | |
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391 PerRegionTable** _fine_grain_regions; |
| 342 | 392 |
| 393 G1BlockOffsetSharedArray* _bosa; | |
| 394 G1CollectedHeap* _g1h; | |
| 395 | |
| 396 // The number yielded since initialization. | |
| 397 size_t _n_yielded_fine; | |
| 398 size_t _n_yielded_coarse; | |
| 399 size_t _n_yielded_sparse; | |
| 400 | |
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401 // Indicates what granularity of table that we're currently iterating over. |
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402 // We start iterating over the sparse table, progress to the fine grain |
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403 // table, and then finish with the coarse table. |
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404 // See HeapRegionRemSetIterator::has_next(). |
| 342 | 405 enum IterState { |
| 406 Sparse, | |
| 407 Fine, | |
| 408 Coarse | |
| 409 }; | |
| 410 IterState _is; | |
| 411 | |
| 412 // In both kinds of iteration, heap offset of first card of current | |
| 413 // region. | |
| 414 size_t _cur_region_card_offset; | |
| 415 // Card offset within cur region. | |
| 416 size_t _cur_region_cur_card; | |
| 417 | |
| 418 // Coarse table iteration fields: | |
| 419 | |
| 420 // Current region index; | |
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421 int _coarse_cur_region_index; |
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422 size_t _coarse_cur_region_cur_card; |
| 342 | 423 |
| 424 bool coarse_has_next(size_t& card_index); | |
| 425 | |
| 426 // Fine table iteration fields: | |
| 427 | |
| 428 // Index of bucket-list we're working on. | |
| 429 int _fine_array_index; | |
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430 |
| 342 | 431 // Per Region Table we're doing within current bucket list. |
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432 PerRegionTable* _fine_cur_prt; |
| 342 | 433 |
| 434 /* SparsePRT::*/ SparsePRTIter _sparse_iter; | |
| 435 | |
| 436 void fine_find_next_non_null_prt(); | |
| 437 | |
| 438 bool fine_has_next(); | |
| 439 bool fine_has_next(size_t& card_index); | |
| 440 | |
| 441 public: | |
| 442 // We require an iterator to be initialized before use, so the | |
| 443 // constructor does little. | |
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444 HeapRegionRemSetIterator(const HeapRegionRemSet* hrrs); |
| 342 | 445 |
| 446 // If there remains one or more cards to be yielded, returns true and | |
| 447 // sets "card_index" to one of those cards (which is then considered | |
| 448 // yielded.) Otherwise, returns false (and leaves "card_index" | |
| 449 // undefined.) | |
| 450 bool has_next(size_t& card_index); | |
| 451 | |
| 452 size_t n_yielded_fine() { return _n_yielded_fine; } | |
| 453 size_t n_yielded_coarse() { return _n_yielded_coarse; } | |
| 454 size_t n_yielded_sparse() { return _n_yielded_sparse; } | |
| 455 size_t n_yielded() { | |
| 456 return n_yielded_fine() + n_yielded_coarse() + n_yielded_sparse(); | |
| 457 } | |
| 458 }; | |
| 459 | |
| 1972 | 460 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONREMSET_HPP |