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annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.hpp @ 3776:23d434c6290d
7055073: G1: code cleanup in the concurrentMark.* files
Summary: Only cosmetic changes to make the concurrentMark.* more consistent, code-style-wise, with the rest of the codebase.
Reviewed-by: johnc, ysr
| author | tonyp |
|---|---|
| date | Mon, 20 Jun 2011 22:03:13 -0400 |
| parents | 97ba643ea3ed |
| children | e8b0b0392037 |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 2173 | 2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_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; | |
| 38 class PosParPRT; | |
| 39 class SparsePRT; | |
| 40 | |
| 2173 | 41 // Essentially a wrapper around SparsePRTCleanupTask. See |
| 42 // sparsePRT.hpp for more details. | |
| 43 class HRRSCleanupTask : public SparsePRTCleanupTask { | |
| 44 }; | |
| 342 | 45 |
| 46 // The "_coarse_map" is a bitmap with one bit for each region, where set | |
| 47 // bits indicate that the corresponding region may contain some pointer | |
| 48 // into the owning region. | |
| 49 | |
| 50 // The "_fine_grain_entries" array is an open hash table of PerRegionTables | |
| 51 // (PRTs), indicating regions for which we're keeping the RS as a set of | |
| 52 // cards. The strategy is to cap the size of the fine-grain table, | |
| 53 // deleting an entry and setting the corresponding coarse-grained bit when | |
| 54 // we would overflow this cap. | |
| 55 | |
| 56 // We use a mixture of locking and lock-free techniques here. We allow | |
| 57 // threads to locate PRTs without locking, but threads attempting to alter | |
| 58 // a bucket list obtain a lock. This means that any failing attempt to | |
| 59 // find a PRT must be retried with the lock. It might seem dangerous that | |
| 60 // a read can find a PRT that is concurrently deleted. This is all right, | |
| 61 // because: | |
| 62 // | |
| 63 // 1) We only actually free PRT's at safe points (though we reuse them at | |
| 64 // other times). | |
| 65 // 2) We find PRT's in an attempt to add entries. If a PRT is deleted, | |
| 66 // it's _coarse_map bit is set, so the that we were attempting to add | |
| 67 // is represented. If a deleted PRT is re-used, a thread adding a bit, | |
| 68 // thinking the PRT is for a different region, does no harm. | |
| 69 | |
|
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70 class OtherRegionsTable VALUE_OBJ_CLASS_SPEC { |
| 342 | 71 friend class HeapRegionRemSetIterator; |
| 72 | |
| 73 G1CollectedHeap* _g1h; | |
| 74 Mutex _m; | |
| 75 HeapRegion* _hr; | |
| 76 | |
| 77 // These are protected by "_m". | |
| 78 BitMap _coarse_map; | |
| 79 size_t _n_coarse_entries; | |
| 80 static jint _n_coarsenings; | |
| 81 | |
| 82 PosParPRT** _fine_grain_regions; | |
| 83 size_t _n_fine_entries; | |
| 84 | |
| 85 #define SAMPLE_FOR_EVICTION 1 | |
| 86 #if SAMPLE_FOR_EVICTION | |
| 87 size_t _fine_eviction_start; | |
| 88 static size_t _fine_eviction_stride; | |
| 89 static size_t _fine_eviction_sample_size; | |
| 90 #endif | |
| 91 | |
| 92 SparsePRT _sparse_table; | |
| 93 | |
| 94 // These are static after init. | |
| 95 static size_t _max_fine_entries; | |
| 96 static size_t _mod_max_fine_entries_mask; | |
| 97 | |
| 98 // Requires "prt" to be the first element of the bucket list appropriate | |
| 99 // for "hr". If this list contains an entry for "hr", return it, | |
| 100 // otherwise return "NULL". | |
| 101 PosParPRT* find_region_table(size_t ind, HeapRegion* hr) const; | |
| 102 | |
| 103 // Find, delete, and return a candidate PosParPRT, if any exists, | |
| 104 // adding the deleted region to the coarse bitmap. Requires the caller | |
| 105 // to hold _m, and the fine-grain table to be full. | |
| 106 PosParPRT* delete_region_table(); | |
| 107 | |
| 108 // If a PRT for "hr" is in the bucket list indicated by "ind" (which must | |
| 109 // be the correct index for "hr"), delete it and return true; else return | |
| 110 // false. | |
| 111 bool del_single_region_table(size_t ind, HeapRegion* hr); | |
| 112 | |
| 113 static jint _cache_probes; | |
| 114 static jint _cache_hits; | |
| 115 | |
| 116 // Indexed by thread X heap region, to minimize thread contention. | |
| 117 static int** _from_card_cache; | |
| 118 static size_t _from_card_cache_max_regions; | |
| 119 static size_t _from_card_cache_mem_size; | |
| 120 | |
| 121 public: | |
| 122 OtherRegionsTable(HeapRegion* hr); | |
| 123 | |
| 124 HeapRegion* hr() const { return _hr; } | |
| 125 | |
| 126 // For now. Could "expand" some tables in the future, so that this made | |
| 127 // sense. | |
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128 void add_reference(OopOrNarrowOopStar from, int tid); |
| 342 | 129 |
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130 void add_reference(OopOrNarrowOopStar from) { |
| 342 | 131 return add_reference(from, 0); |
| 132 } | |
| 133 | |
| 134 // Removes any entries shown by the given bitmaps to contain only dead | |
| 135 // objects. | |
| 136 void scrub(CardTableModRefBS* ctbs, BitMap* region_bm, BitMap* card_bm); | |
| 137 | |
| 138 // Not const because it takes a lock. | |
| 139 size_t occupied() const; | |
| 140 size_t occ_fine() const; | |
| 141 size_t occ_coarse() const; | |
| 142 size_t occ_sparse() const; | |
| 143 | |
| 144 static jint n_coarsenings() { return _n_coarsenings; } | |
| 145 | |
| 146 // Returns size in bytes. | |
| 147 // Not const because it takes a lock. | |
| 148 size_t mem_size() const; | |
| 149 static size_t static_mem_size(); | |
| 150 static size_t fl_mem_size(); | |
| 151 | |
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152 bool contains_reference(OopOrNarrowOopStar from) const; |
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153 bool contains_reference_locked(OopOrNarrowOopStar from) const; |
| 342 | 154 |
| 155 void clear(); | |
| 156 | |
| 157 // Specifically clear the from_card_cache. | |
| 158 void clear_fcc(); | |
| 159 | |
| 160 // "from_hr" is being cleared; remove any entries from it. | |
| 161 void clear_incoming_entry(HeapRegion* from_hr); | |
| 162 | |
| 2173 | 163 void do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task); |
| 164 | |
| 342 | 165 // Declare the heap size (in # of regions) to the OtherRegionsTable. |
| 166 // (Uses it to initialize from_card_cache). | |
| 167 static void init_from_card_cache(size_t max_regions); | |
| 168 | |
| 169 // Declares that only regions i s.t. 0 <= i < new_n_regs are in use. | |
| 170 // Make sure any entries for higher regions are invalid. | |
| 171 static void shrink_from_card_cache(size_t new_n_regs); | |
| 172 | |
| 173 static void print_from_card_cache(); | |
| 174 }; | |
| 175 | |
| 176 class HeapRegionRemSet : public CHeapObj { | |
| 177 friend class VMStructs; | |
| 178 friend class HeapRegionRemSetIterator; | |
| 179 | |
| 180 public: | |
| 181 enum Event { | |
| 182 Event_EvacStart, Event_EvacEnd, Event_RSUpdateEnd | |
| 183 }; | |
| 184 | |
| 185 private: | |
| 186 G1BlockOffsetSharedArray* _bosa; | |
| 187 G1BlockOffsetSharedArray* bosa() const { return _bosa; } | |
| 188 | |
| 189 OtherRegionsTable _other_regions; | |
| 190 | |
| 191 enum ParIterState { Unclaimed, Claimed, Complete }; | |
| 1261 | 192 volatile ParIterState _iter_state; |
| 193 volatile jlong _iter_claimed; | |
| 342 | 194 |
| 195 // Unused unless G1RecordHRRSOops is true. | |
| 196 | |
| 197 static const int MaxRecorded = 1000000; | |
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198 static OopOrNarrowOopStar* _recorded_oops; |
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199 static HeapWord** _recorded_cards; |
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200 static HeapRegion** _recorded_regions; |
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201 static int _n_recorded; |
| 342 | 202 |
| 203 static const int MaxRecordedEvents = 1000; | |
| 204 static Event* _recorded_events; | |
| 205 static int* _recorded_event_index; | |
| 206 static int _n_recorded_events; | |
| 207 | |
| 208 static void print_event(outputStream* str, Event evnt); | |
| 209 | |
| 210 public: | |
| 211 HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, | |
| 212 HeapRegion* hr); | |
| 213 | |
| 214 static int num_par_rem_sets(); | |
| 1261 | 215 static void setup_remset_size(); |
| 342 | 216 |
| 217 HeapRegion* hr() const { | |
| 218 return _other_regions.hr(); | |
| 219 } | |
| 220 | |
| 221 size_t occupied() const { | |
| 222 return _other_regions.occupied(); | |
| 223 } | |
| 224 size_t occ_fine() const { | |
| 225 return _other_regions.occ_fine(); | |
| 226 } | |
| 227 size_t occ_coarse() const { | |
| 228 return _other_regions.occ_coarse(); | |
| 229 } | |
| 230 size_t occ_sparse() const { | |
| 231 return _other_regions.occ_sparse(); | |
| 232 } | |
| 233 | |
| 234 static jint n_coarsenings() { return OtherRegionsTable::n_coarsenings(); } | |
| 235 | |
| 236 /* Used in the sequential case. Returns "true" iff this addition causes | |
| 237 the size limit to be reached. */ | |
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238 void add_reference(OopOrNarrowOopStar from) { |
| 342 | 239 _other_regions.add_reference(from); |
| 240 } | |
| 241 | |
| 242 /* Used in the parallel case. Returns "true" iff this addition causes | |
| 243 the size limit to be reached. */ | |
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244 void add_reference(OopOrNarrowOopStar from, int tid) { |
| 342 | 245 _other_regions.add_reference(from, tid); |
| 246 } | |
| 247 | |
| 248 // Removes any entries shown by the given bitmaps to contain only dead | |
| 249 // objects. | |
| 250 void scrub(CardTableModRefBS* ctbs, BitMap* region_bm, BitMap* card_bm); | |
| 251 | |
| 252 // The region is being reclaimed; clear its remset, and any mention of | |
| 253 // entries for this region in other remsets. | |
| 254 void clear(); | |
| 255 | |
| 256 // Forget any entries due to pointers from "from_hr". | |
| 257 void clear_incoming_entry(HeapRegion* from_hr) { | |
| 258 _other_regions.clear_incoming_entry(from_hr); | |
| 259 } | |
| 260 | |
| 261 #if 0 | |
| 262 virtual void cleanup() = 0; | |
| 263 #endif | |
| 264 | |
| 265 // Should be called from single-threaded code. | |
| 266 void init_for_par_iteration(); | |
| 267 // Attempt to claim the region. Returns true iff this call caused an | |
| 268 // atomic transition from Unclaimed to Claimed. | |
| 269 bool claim_iter(); | |
| 270 // Sets the iteration state to "complete". | |
| 271 void set_iter_complete(); | |
| 272 // Returns "true" iff the region's iteration is complete. | |
| 273 bool iter_is_complete(); | |
| 274 | |
| 1261 | 275 // Support for claiming blocks of cards during iteration |
| 276 void set_iter_claimed(size_t x) { _iter_claimed = (jlong)x; } | |
| 277 size_t iter_claimed() const { return (size_t)_iter_claimed; } | |
| 278 // Claim the next block of cards | |
| 279 size_t iter_claimed_next(size_t step) { | |
| 280 size_t current, next; | |
| 281 do { | |
| 282 current = iter_claimed(); | |
| 283 next = current + step; | |
| 284 } while (Atomic::cmpxchg((jlong)next, &_iter_claimed, (jlong)current) != (jlong)current); | |
| 285 return current; | |
| 286 } | |
| 287 | |
| 342 | 288 // Initialize the given iterator to iterate over this rem set. |
| 289 void init_iterator(HeapRegionRemSetIterator* iter) const; | |
| 290 | |
| 291 #if 0 | |
| 292 // Apply the "do_card" method to the start address of every card in the | |
| 293 // rem set. Returns false if some application of the closure aborted. | |
| 294 virtual bool card_iterate(CardClosure* iter) = 0; | |
| 295 #endif | |
| 296 | |
| 297 // The actual # of bytes this hr_remset takes up. | |
| 298 size_t mem_size() { | |
| 299 return _other_regions.mem_size() | |
| 300 // This correction is necessary because the above includes the second | |
| 301 // part. | |
| 302 + sizeof(this) - sizeof(OtherRegionsTable); | |
| 303 } | |
| 304 | |
| 305 // Returns the memory occupancy of all static data structures associated | |
| 306 // with remembered sets. | |
| 307 static size_t static_mem_size() { | |
| 308 return OtherRegionsTable::static_mem_size(); | |
| 309 } | |
| 310 | |
| 311 // Returns the memory occupancy of all free_list data structures associated | |
| 312 // with remembered sets. | |
| 313 static size_t fl_mem_size() { | |
| 314 return OtherRegionsTable::fl_mem_size(); | |
| 315 } | |
| 316 | |
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317 bool contains_reference(OopOrNarrowOopStar from) const { |
| 342 | 318 return _other_regions.contains_reference(from); |
| 319 } | |
| 320 void print() const; | |
| 321 | |
| 322 // Called during a stop-world phase to perform any deferred cleanups. | |
| 323 // The second version may be called by parallel threads after then finish | |
| 324 // collection work. | |
| 325 static void cleanup(); | |
| 326 static void par_cleanup(); | |
| 327 | |
| 328 // Declare the heap size (in # of regions) to the HeapRegionRemSet(s). | |
| 329 // (Uses it to initialize from_card_cache). | |
| 330 static void init_heap(size_t max_regions) { | |
| 331 OtherRegionsTable::init_from_card_cache(max_regions); | |
| 332 } | |
| 333 | |
| 334 // Declares that only regions i s.t. 0 <= i < new_n_regs are in use. | |
| 335 static void shrink_heap(size_t new_n_regs) { | |
| 336 OtherRegionsTable::shrink_from_card_cache(new_n_regs); | |
| 337 } | |
| 338 | |
| 339 #ifndef PRODUCT | |
| 340 static void print_from_card_cache() { | |
| 341 OtherRegionsTable::print_from_card_cache(); | |
| 342 } | |
| 343 #endif | |
| 344 | |
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345 static void record(HeapRegion* hr, OopOrNarrowOopStar f); |
| 342 | 346 static void print_recorded(); |
| 347 static void record_event(Event evnt); | |
| 348 | |
| 2173 | 349 // These are wrappers for the similarly-named methods on |
| 350 // SparsePRT. Look at sparsePRT.hpp for more details. | |
| 351 static void reset_for_cleanup_tasks(); | |
| 352 void do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task); | |
| 353 static void finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task); | |
| 354 | |
| 342 | 355 // Run unit tests. |
| 356 #ifndef PRODUCT | |
| 357 static void test(); | |
| 358 #endif | |
| 359 }; | |
| 360 | |
| 361 class HeapRegionRemSetIterator : public CHeapObj { | |
| 362 | |
| 363 // The region over which we're iterating. | |
| 364 const HeapRegionRemSet* _hrrs; | |
| 365 | |
| 366 // Local caching of HRRS fields. | |
| 367 const BitMap* _coarse_map; | |
| 368 PosParPRT** _fine_grain_regions; | |
| 369 | |
| 370 G1BlockOffsetSharedArray* _bosa; | |
| 371 G1CollectedHeap* _g1h; | |
| 372 | |
| 373 // The number yielded since initialization. | |
| 374 size_t _n_yielded_fine; | |
| 375 size_t _n_yielded_coarse; | |
| 376 size_t _n_yielded_sparse; | |
| 377 | |
| 378 // If true we're iterating over the coarse table; if false the fine | |
| 379 // table. | |
| 380 enum IterState { | |
| 381 Sparse, | |
| 382 Fine, | |
| 383 Coarse | |
| 384 }; | |
| 385 IterState _is; | |
| 386 | |
| 387 // In both kinds of iteration, heap offset of first card of current | |
| 388 // region. | |
| 389 size_t _cur_region_card_offset; | |
| 390 // Card offset within cur region. | |
| 391 size_t _cur_region_cur_card; | |
| 392 | |
| 393 // Coarse table iteration fields: | |
| 394 | |
| 395 // Current region index; | |
| 396 int _coarse_cur_region_index; | |
| 397 int _coarse_cur_region_cur_card; | |
| 398 | |
| 399 bool coarse_has_next(size_t& card_index); | |
| 400 | |
| 401 // Fine table iteration fields: | |
| 402 | |
| 403 // Index of bucket-list we're working on. | |
| 404 int _fine_array_index; | |
| 405 // Per Region Table we're doing within current bucket list. | |
| 406 PosParPRT* _fine_cur_prt; | |
| 407 | |
| 408 /* SparsePRT::*/ SparsePRTIter _sparse_iter; | |
| 409 | |
| 410 void fine_find_next_non_null_prt(); | |
| 411 | |
| 412 bool fine_has_next(); | |
| 413 bool fine_has_next(size_t& card_index); | |
| 414 | |
| 415 public: | |
| 416 // We require an iterator to be initialized before use, so the | |
| 417 // constructor does little. | |
| 418 HeapRegionRemSetIterator(); | |
| 419 | |
| 420 void initialize(const HeapRegionRemSet* hrrs); | |
| 421 | |
| 422 // If there remains one or more cards to be yielded, returns true and | |
| 423 // sets "card_index" to one of those cards (which is then considered | |
| 424 // yielded.) Otherwise, returns false (and leaves "card_index" | |
| 425 // undefined.) | |
| 426 bool has_next(size_t& card_index); | |
| 427 | |
| 428 size_t n_yielded_fine() { return _n_yielded_fine; } | |
| 429 size_t n_yielded_coarse() { return _n_yielded_coarse; } | |
| 430 size_t n_yielded_sparse() { return _n_yielded_sparse; } | |
| 431 size_t n_yielded() { | |
| 432 return n_yielded_fine() + n_yielded_coarse() + n_yielded_sparse(); | |
| 433 } | |
| 434 }; | |
| 435 | |
| 436 #if 0 | |
| 437 class CardClosure: public Closure { | |
| 438 public: | |
| 439 virtual void do_card(HeapWord* card_start) = 0; | |
| 440 }; | |
| 441 | |
| 442 #endif | |
| 1972 | 443 |
| 444 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONREMSET_HPP |