Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.hpp @ 17753:191174b49bec
8035406: Improve data structure for Code Cache remembered sets
Summary: Change the code cache remembered sets data structure from a GrowableArray to a chunked list of nmethods. This makes the data structure more amenable to parallelization, and decreases freeing time.
Reviewed-by: mgerdin, brutisso
| author | tschatzl |
|---|---|
| date | Mon, 24 Mar 2014 15:30:14 +0100 |
| parents | 55fb97c4c58d |
| children | d7070f371770 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2014, 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 | |
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28 #include "gc_implementation/g1/g1CodeCacheRemSet.hpp" |
| 1972 | 29 #include "gc_implementation/g1/sparsePRT.hpp" |
| 30 | |
| 342 | 31 // Remembered set for a heap region. Represent a set of "cards" that |
| 32 // contain pointers into the owner heap region. Cards are defined somewhat | |
| 33 // abstractly, in terms of what the "BlockOffsetTable" in use can parse. | |
| 34 | |
| 35 class G1CollectedHeap; | |
| 36 class G1BlockOffsetSharedArray; | |
| 37 class HeapRegion; | |
| 38 class HeapRegionRemSetIterator; | |
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39 class PerRegionTable; |
| 342 | 40 class SparsePRT; |
| 12080 | 41 class nmethod; |
| 342 | 42 |
| 2173 | 43 // Essentially a wrapper around SparsePRTCleanupTask. See |
| 44 // sparsePRT.hpp for more details. | |
| 45 class HRRSCleanupTask : public SparsePRTCleanupTask { | |
| 46 }; | |
| 342 | 47 |
| 48 // The "_coarse_map" is a bitmap with one bit for each region, where set | |
| 49 // bits indicate that the corresponding region may contain some pointer | |
| 50 // into the owning region. | |
| 51 | |
| 52 // The "_fine_grain_entries" array is an open hash table of PerRegionTables | |
| 53 // (PRTs), indicating regions for which we're keeping the RS as a set of | |
| 54 // cards. The strategy is to cap the size of the fine-grain table, | |
| 55 // deleting an entry and setting the corresponding coarse-grained bit when | |
| 56 // we would overflow this cap. | |
| 57 | |
| 58 // We use a mixture of locking and lock-free techniques here. We allow | |
| 59 // threads to locate PRTs without locking, but threads attempting to alter | |
| 60 // a bucket list obtain a lock. This means that any failing attempt to | |
| 61 // find a PRT must be retried with the lock. It might seem dangerous that | |
| 62 // a read can find a PRT that is concurrently deleted. This is all right, | |
| 63 // because: | |
| 64 // | |
| 65 // 1) We only actually free PRT's at safe points (though we reuse them at | |
| 66 // other times). | |
| 67 // 2) We find PRT's in an attempt to add entries. If a PRT is deleted, | |
| 68 // it's _coarse_map bit is set, so the that we were attempting to add | |
| 69 // is represented. If a deleted PRT is re-used, a thread adding a bit, | |
| 70 // thinking the PRT is for a different region, does no harm. | |
| 71 | |
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72 class OtherRegionsTable VALUE_OBJ_CLASS_SPEC { |
| 342 | 73 friend class HeapRegionRemSetIterator; |
| 74 | |
| 75 G1CollectedHeap* _g1h; | |
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76 Mutex* _m; |
| 342 | 77 HeapRegion* _hr; |
| 78 | |
| 79 // These are protected by "_m". | |
| 80 BitMap _coarse_map; | |
| 81 size_t _n_coarse_entries; | |
| 82 static jint _n_coarsenings; | |
| 83 | |
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84 PerRegionTable** _fine_grain_regions; |
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85 size_t _n_fine_entries; |
| 342 | 86 |
| 6253 | 87 // The fine grain remembered sets are doubly linked together using |
| 88 // their 'next' and 'prev' fields. | |
| 89 // This allows fast bulk freeing of all the fine grain remembered | |
| 90 // set entries, and fast finding of all of them without iterating | |
| 91 // over the _fine_grain_regions table. | |
| 92 PerRegionTable * _first_all_fine_prts; | |
| 93 PerRegionTable * _last_all_fine_prts; | |
| 94 | |
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95 // Used to sample a subset of the fine grain PRTs to determine which |
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96 // PRT to evict and coarsen. |
| 342 | 97 size_t _fine_eviction_start; |
| 98 static size_t _fine_eviction_stride; | |
| 99 static size_t _fine_eviction_sample_size; | |
| 100 | |
| 101 SparsePRT _sparse_table; | |
| 102 | |
| 103 // These are static after init. | |
| 104 static size_t _max_fine_entries; | |
| 105 static size_t _mod_max_fine_entries_mask; | |
| 106 | |
| 107 // Requires "prt" to be the first element of the bucket list appropriate | |
| 108 // for "hr". If this list contains an entry for "hr", return it, | |
| 109 // otherwise return "NULL". | |
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110 PerRegionTable* find_region_table(size_t ind, HeapRegion* hr) const; |
| 342 | 111 |
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112 // Find, delete, and return a candidate PerRegionTable, if any exists, |
| 342 | 113 // adding the deleted region to the coarse bitmap. Requires the caller |
| 114 // to hold _m, and the fine-grain table to be full. | |
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115 PerRegionTable* delete_region_table(); |
| 342 | 116 |
| 117 // If a PRT for "hr" is in the bucket list indicated by "ind" (which must | |
| 118 // be the correct index for "hr"), delete it and return true; else return | |
| 119 // false. | |
| 120 bool del_single_region_table(size_t ind, HeapRegion* hr); | |
| 121 | |
| 122 // Indexed by thread X heap region, to minimize thread contention. | |
| 123 static int** _from_card_cache; | |
| 124 static size_t _from_card_cache_max_regions; | |
| 125 static size_t _from_card_cache_mem_size; | |
| 126 | |
| 6253 | 127 // link/add the given fine grain remembered set into the "all" list |
| 128 void link_to_all(PerRegionTable * prt); | |
| 129 // unlink/remove the given fine grain remembered set into the "all" list | |
| 130 void unlink_from_all(PerRegionTable * prt); | |
| 131 | |
| 342 | 132 public: |
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133 OtherRegionsTable(HeapRegion* hr, Mutex* m); |
| 342 | 134 |
| 135 HeapRegion* hr() const { return _hr; } | |
| 136 | |
| 137 // For now. Could "expand" some tables in the future, so that this made | |
| 138 // sense. | |
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139 void add_reference(OopOrNarrowOopStar from, int tid); |
| 342 | 140 |
| 141 // Removes any entries shown by the given bitmaps to contain only dead | |
| 142 // objects. | |
| 143 void scrub(CardTableModRefBS* ctbs, BitMap* region_bm, BitMap* card_bm); | |
| 144 | |
| 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 | |
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195 // A set of code blobs (nmethods) whose code contains pointers into |
| 12080 | 196 // the region that owns this RSet. |
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197 G1CodeRootSet _code_roots; |
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198 |
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199 Mutex _m; |
| 12080 | 200 |
| 342 | 201 OtherRegionsTable _other_regions; |
| 202 | |
| 203 enum ParIterState { Unclaimed, Claimed, Complete }; | |
| 1261 | 204 volatile ParIterState _iter_state; |
| 205 volatile jlong _iter_claimed; | |
| 342 | 206 |
| 207 // Unused unless G1RecordHRRSOops is true. | |
| 208 | |
| 209 static const int MaxRecorded = 1000000; | |
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210 static OopOrNarrowOopStar* _recorded_oops; |
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211 static HeapWord** _recorded_cards; |
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212 static HeapRegion** _recorded_regions; |
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213 static int _n_recorded; |
| 342 | 214 |
| 215 static const int MaxRecordedEvents = 1000; | |
| 216 static Event* _recorded_events; | |
| 217 static int* _recorded_event_index; | |
| 218 static int _n_recorded_events; | |
| 219 | |
| 220 static void print_event(outputStream* str, Event evnt); | |
| 221 | |
| 222 public: | |
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223 HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, HeapRegion* hr); |
| 342 | 224 |
| 225 static int num_par_rem_sets(); | |
| 1261 | 226 static void setup_remset_size(); |
| 342 | 227 |
| 228 HeapRegion* hr() const { | |
| 229 return _other_regions.hr(); | |
| 230 } | |
| 231 | |
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232 size_t occupied() { |
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233 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); |
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234 return occupied_locked(); |
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235 } |
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236 size_t occupied_locked() { |
| 342 | 237 return _other_regions.occupied(); |
| 238 } | |
| 239 size_t occ_fine() const { | |
| 240 return _other_regions.occ_fine(); | |
| 241 } | |
| 242 size_t occ_coarse() const { | |
| 243 return _other_regions.occ_coarse(); | |
| 244 } | |
| 245 size_t occ_sparse() const { | |
| 246 return _other_regions.occ_sparse(); | |
| 247 } | |
| 248 | |
| 249 static jint n_coarsenings() { return OtherRegionsTable::n_coarsenings(); } | |
| 250 | |
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251 // Used in the sequential case. |
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252 void add_reference(OopOrNarrowOopStar from) { |
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253 _other_regions.add_reference(from, 0); |
| 342 | 254 } |
| 255 | |
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256 // Used in the parallel case. |
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257 void add_reference(OopOrNarrowOopStar from, int tid) { |
| 342 | 258 _other_regions.add_reference(from, tid); |
| 259 } | |
| 260 | |
| 261 // Removes any entries shown by the given bitmaps to contain only dead | |
| 262 // objects. | |
| 263 void scrub(CardTableModRefBS* ctbs, BitMap* region_bm, BitMap* card_bm); | |
| 264 | |
| 265 // The region is being reclaimed; clear its remset, and any mention of | |
| 266 // entries for this region in other remsets. | |
| 267 void clear(); | |
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268 void clear_locked(); |
| 342 | 269 |
| 270 // Attempt to claim the region. Returns true iff this call caused an | |
| 271 // atomic transition from Unclaimed to Claimed. | |
| 272 bool claim_iter(); | |
| 273 // Sets the iteration state to "complete". | |
| 274 void set_iter_complete(); | |
| 275 // Returns "true" iff the region's iteration is complete. | |
| 276 bool iter_is_complete(); | |
| 277 | |
| 1261 | 278 // Support for claiming blocks of cards during iteration |
| 279 size_t iter_claimed() const { return (size_t)_iter_claimed; } | |
| 280 // Claim the next block of cards | |
| 281 size_t iter_claimed_next(size_t step) { | |
| 282 size_t current, next; | |
| 283 do { | |
| 284 current = iter_claimed(); | |
| 285 next = current + step; | |
| 286 } while (Atomic::cmpxchg((jlong)next, &_iter_claimed, (jlong)current) != (jlong)current); | |
| 287 return current; | |
| 288 } | |
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289 void reset_for_par_iteration(); |
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290 |
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291 bool verify_ready_for_par_iteration() { |
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292 return (_iter_state == Unclaimed) && (_iter_claimed == 0); |
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293 } |
| 1261 | 294 |
| 342 | 295 // The actual # of bytes this hr_remset takes up. |
| 12080 | 296 // Note also includes the strong code root set. |
| 342 | 297 size_t mem_size() { |
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298 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); |
| 342 | 299 return _other_regions.mem_size() |
| 300 // This correction is necessary because the above includes the second | |
| 301 // part. | |
| 12080 | 302 + (sizeof(this) - sizeof(OtherRegionsTable)) |
| 303 + strong_code_roots_mem_size(); | |
| 342 | 304 } |
| 305 | |
| 306 // Returns the memory occupancy of all static data structures associated | |
| 307 // with remembered sets. | |
| 308 static size_t static_mem_size() { | |
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309 return OtherRegionsTable::static_mem_size() + G1CodeRootSet::static_mem_size(); |
| 342 | 310 } |
| 311 | |
| 312 // Returns the memory occupancy of all free_list data structures associated | |
| 313 // with remembered sets. | |
| 314 static size_t fl_mem_size() { | |
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315 return OtherRegionsTable::fl_mem_size() + G1CodeRootSet::fl_mem_size(); |
| 342 | 316 } |
| 317 | |
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318 bool contains_reference(OopOrNarrowOopStar from) const { |
| 342 | 319 return _other_regions.contains_reference(from); |
| 320 } | |
| 12080 | 321 |
| 322 // Routines for managing the list of code roots that point into | |
| 323 // the heap region that owns this RSet. | |
| 324 void add_strong_code_root(nmethod* nm); | |
| 325 void remove_strong_code_root(nmethod* nm); | |
| 326 | |
| 327 // During a collection, migrate the successfully evacuated strong | |
| 328 // code roots that referenced into the region that owns this RSet | |
| 329 // to the RSets of the new regions that they now point into. | |
| 330 // Unsuccessfully evacuated code roots are not migrated. | |
| 331 void migrate_strong_code_roots(); | |
| 332 | |
| 333 // Applies blk->do_code_blob() to each of the entries in | |
| 334 // the strong code roots list | |
| 335 void strong_code_roots_do(CodeBlobClosure* blk) const; | |
| 336 | |
| 337 // Returns the number of elements in the strong code roots list | |
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338 size_t strong_code_roots_list_length() { |
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339 return _code_roots.length(); |
| 12080 | 340 } |
| 341 | |
| 342 // Returns true if the strong code roots contains the given | |
| 343 // nmethod. | |
| 344 bool strong_code_roots_list_contains(nmethod* nm) { | |
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345 return _code_roots.contains(nm); |
| 12080 | 346 } |
| 347 | |
| 348 // Returns the amount of memory, in bytes, currently | |
| 349 // consumed by the strong code roots. | |
| 350 size_t strong_code_roots_mem_size(); | |
| 351 | |
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352 void print() PRODUCT_RETURN; |
| 342 | 353 |
| 354 // Called during a stop-world phase to perform any deferred cleanups. | |
| 355 static void cleanup(); | |
| 356 | |
| 357 // Declare the heap size (in # of regions) to the HeapRegionRemSet(s). | |
| 358 // (Uses it to initialize from_card_cache). | |
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359 static void init_heap(uint max_regions) { |
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360 G1CodeRootSet::initialize(); |
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361 OtherRegionsTable::init_from_card_cache((size_t) max_regions); |
| 342 | 362 } |
| 363 | |
| 364 // Declares that only regions i s.t. 0 <= i < new_n_regs are in use. | |
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365 static void shrink_heap(uint new_n_regs) { |
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366 OtherRegionsTable::shrink_from_card_cache((size_t) new_n_regs); |
| 342 | 367 } |
| 368 | |
| 369 #ifndef PRODUCT | |
| 370 static void print_from_card_cache() { | |
| 371 OtherRegionsTable::print_from_card_cache(); | |
| 372 } | |
| 373 #endif | |
| 374 | |
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375 static void record(HeapRegion* hr, OopOrNarrowOopStar f); |
| 342 | 376 static void print_recorded(); |
| 377 static void record_event(Event evnt); | |
| 378 | |
| 2173 | 379 // These are wrappers for the similarly-named methods on |
| 380 // SparsePRT. Look at sparsePRT.hpp for more details. | |
| 381 static void reset_for_cleanup_tasks(); | |
| 382 void do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task); | |
| 383 static void finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task); | |
| 384 | |
| 342 | 385 // Run unit tests. |
| 386 #ifndef PRODUCT | |
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387 static void test_prt(); |
| 342 | 388 static void test(); |
| 389 #endif | |
| 390 }; | |
| 391 | |
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392 class HeapRegionRemSetIterator : public StackObj { |
| 342 | 393 |
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394 // The region RSet over which we're iterating. |
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395 HeapRegionRemSet* _hrrs; |
| 342 | 396 |
| 397 // Local caching of HRRS fields. | |
| 398 const BitMap* _coarse_map; | |
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399 PerRegionTable** _fine_grain_regions; |
| 342 | 400 |
| 401 G1BlockOffsetSharedArray* _bosa; | |
| 402 G1CollectedHeap* _g1h; | |
| 403 | |
| 404 // The number yielded since initialization. | |
| 405 size_t _n_yielded_fine; | |
| 406 size_t _n_yielded_coarse; | |
| 407 size_t _n_yielded_sparse; | |
| 408 | |
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409 // Indicates what granularity of table that we're currently iterating over. |
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410 // We start iterating over the sparse table, progress to the fine grain |
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411 // table, and then finish with the coarse table. |
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412 // See HeapRegionRemSetIterator::has_next(). |
| 342 | 413 enum IterState { |
| 414 Sparse, | |
| 415 Fine, | |
| 416 Coarse | |
| 417 }; | |
| 418 IterState _is; | |
| 419 | |
| 420 // In both kinds of iteration, heap offset of first card of current | |
| 421 // region. | |
| 422 size_t _cur_region_card_offset; | |
| 423 // Card offset within cur region. | |
| 424 size_t _cur_region_cur_card; | |
| 425 | |
| 426 // Coarse table iteration fields: | |
| 427 | |
| 428 // Current region index; | |
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429 int _coarse_cur_region_index; |
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430 size_t _coarse_cur_region_cur_card; |
| 342 | 431 |
| 432 bool coarse_has_next(size_t& card_index); | |
| 433 | |
| 434 // Fine table iteration fields: | |
| 435 | |
| 436 // Index of bucket-list we're working on. | |
| 437 int _fine_array_index; | |
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438 |
| 342 | 439 // Per Region Table we're doing within current bucket list. |
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440 PerRegionTable* _fine_cur_prt; |
| 342 | 441 |
| 442 /* SparsePRT::*/ SparsePRTIter _sparse_iter; | |
| 443 | |
| 444 void fine_find_next_non_null_prt(); | |
| 445 | |
| 446 bool fine_has_next(); | |
| 447 bool fine_has_next(size_t& card_index); | |
| 448 | |
| 449 public: | |
| 450 // We require an iterator to be initialized before use, so the | |
| 451 // constructor does little. | |
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452 HeapRegionRemSetIterator(HeapRegionRemSet* hrrs); |
| 342 | 453 |
| 454 // If there remains one or more cards to be yielded, returns true and | |
| 455 // sets "card_index" to one of those cards (which is then considered | |
| 456 // yielded.) Otherwise, returns false (and leaves "card_index" | |
| 457 // undefined.) | |
| 458 bool has_next(size_t& card_index); | |
| 459 | |
| 460 size_t n_yielded_fine() { return _n_yielded_fine; } | |
| 461 size_t n_yielded_coarse() { return _n_yielded_coarse; } | |
| 462 size_t n_yielded_sparse() { return _n_yielded_sparse; } | |
| 463 size_t n_yielded() { | |
| 464 return n_yielded_fine() + n_yielded_coarse() + n_yielded_sparse(); | |
| 465 } | |
| 466 }; | |
| 467 | |
| 1972 | 468 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONREMSET_HPP |