Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.hpp @ 20804:7848fc12602b
Merge with jdk8u40-b25
| author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
|---|---|
| date | Tue, 07 Apr 2015 14:58:49 +0200 |
| parents | 52b4284cb496 7baf47cb97cb |
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| rev | line source |
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| 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 |
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48 // The FromCardCache remembers the most recently processed card on the heap on |
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49 // a per-region and per-thread basis. |
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50 class FromCardCache : public AllStatic { |
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51 private: |
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52 // Array of card indices. Indexed by thread X and heap region to minimize |
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53 // thread contention. |
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54 static int** _cache; |
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55 static uint _max_regions; |
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56 static size_t _static_mem_size; |
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57 |
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58 public: |
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59 enum { |
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60 InvalidCard = -1 // Card value of an invalid card, i.e. a card index not otherwise used. |
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61 }; |
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62 |
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63 static void clear(uint region_idx); |
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64 |
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65 // Returns true if the given card is in the cache at the given location, or |
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66 // replaces the card at that location and returns false. |
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67 static bool contains_or_replace(uint worker_id, uint region_idx, int card) { |
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68 int card_in_cache = at(worker_id, region_idx); |
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69 if (card_in_cache == card) { |
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70 return true; |
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71 } else { |
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72 set(worker_id, region_idx, card); |
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73 return false; |
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74 } |
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75 } |
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76 |
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77 static int at(uint worker_id, uint region_idx) { |
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78 return _cache[worker_id][region_idx]; |
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79 } |
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80 |
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81 static void set(uint worker_id, uint region_idx, int val) { |
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82 _cache[worker_id][region_idx] = val; |
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83 } |
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84 |
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85 static void initialize(uint n_par_rs, uint max_num_regions); |
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86 |
| 20337 | 87 static void invalidate(uint start_idx, size_t num_regions); |
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88 |
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89 static void print(outputStream* out = gclog_or_tty) PRODUCT_RETURN; |
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90 |
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91 static size_t static_mem_size() { |
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92 return _static_mem_size; |
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93 } |
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94 }; |
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95 |
| 342 | 96 // The "_coarse_map" is a bitmap with one bit for each region, where set |
| 97 // bits indicate that the corresponding region may contain some pointer | |
| 98 // into the owning region. | |
| 99 | |
| 100 // The "_fine_grain_entries" array is an open hash table of PerRegionTables | |
| 101 // (PRTs), indicating regions for which we're keeping the RS as a set of | |
| 102 // cards. The strategy is to cap the size of the fine-grain table, | |
| 103 // deleting an entry and setting the corresponding coarse-grained bit when | |
| 104 // we would overflow this cap. | |
| 105 | |
| 106 // We use a mixture of locking and lock-free techniques here. We allow | |
| 107 // threads to locate PRTs without locking, but threads attempting to alter | |
| 108 // a bucket list obtain a lock. This means that any failing attempt to | |
| 109 // find a PRT must be retried with the lock. It might seem dangerous that | |
| 110 // a read can find a PRT that is concurrently deleted. This is all right, | |
| 111 // because: | |
| 112 // | |
| 113 // 1) We only actually free PRT's at safe points (though we reuse them at | |
| 114 // other times). | |
| 115 // 2) We find PRT's in an attempt to add entries. If a PRT is deleted, | |
| 116 // it's _coarse_map bit is set, so the that we were attempting to add | |
| 117 // is represented. If a deleted PRT is re-used, a thread adding a bit, | |
| 118 // thinking the PRT is for a different region, does no harm. | |
| 119 | |
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120 class OtherRegionsTable VALUE_OBJ_CLASS_SPEC { |
| 342 | 121 friend class HeapRegionRemSetIterator; |
| 122 | |
| 123 G1CollectedHeap* _g1h; | |
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124 Mutex* _m; |
| 342 | 125 HeapRegion* _hr; |
| 126 | |
| 127 // These are protected by "_m". | |
| 128 BitMap _coarse_map; | |
| 129 size_t _n_coarse_entries; | |
| 130 static jint _n_coarsenings; | |
| 131 | |
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132 PerRegionTable** _fine_grain_regions; |
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133 size_t _n_fine_entries; |
| 342 | 134 |
| 6253 | 135 // The fine grain remembered sets are doubly linked together using |
| 136 // their 'next' and 'prev' fields. | |
| 137 // This allows fast bulk freeing of all the fine grain remembered | |
| 138 // set entries, and fast finding of all of them without iterating | |
| 139 // over the _fine_grain_regions table. | |
| 140 PerRegionTable * _first_all_fine_prts; | |
| 141 PerRegionTable * _last_all_fine_prts; | |
| 142 | |
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143 // Used to sample a subset of the fine grain PRTs to determine which |
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144 // PRT to evict and coarsen. |
| 342 | 145 size_t _fine_eviction_start; |
| 146 static size_t _fine_eviction_stride; | |
| 147 static size_t _fine_eviction_sample_size; | |
| 148 | |
| 149 SparsePRT _sparse_table; | |
| 150 | |
| 151 // These are static after init. | |
| 152 static size_t _max_fine_entries; | |
| 153 static size_t _mod_max_fine_entries_mask; | |
| 154 | |
| 155 // Requires "prt" to be the first element of the bucket list appropriate | |
| 156 // for "hr". If this list contains an entry for "hr", return it, | |
| 157 // otherwise return "NULL". | |
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158 PerRegionTable* find_region_table(size_t ind, HeapRegion* hr) const; |
| 342 | 159 |
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160 // Find, delete, and return a candidate PerRegionTable, if any exists, |
| 342 | 161 // adding the deleted region to the coarse bitmap. Requires the caller |
| 162 // to hold _m, and the fine-grain table to be full. | |
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163 PerRegionTable* delete_region_table(); |
| 342 | 164 |
| 165 // If a PRT for "hr" is in the bucket list indicated by "ind" (which must | |
| 166 // be the correct index for "hr"), delete it and return true; else return | |
| 167 // false. | |
| 168 bool del_single_region_table(size_t ind, HeapRegion* hr); | |
| 169 | |
| 6253 | 170 // link/add the given fine grain remembered set into the "all" list |
| 171 void link_to_all(PerRegionTable * prt); | |
| 172 // unlink/remove the given fine grain remembered set into the "all" list | |
| 173 void unlink_from_all(PerRegionTable * prt); | |
| 174 | |
| 342 | 175 public: |
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176 OtherRegionsTable(HeapRegion* hr, Mutex* m); |
| 342 | 177 |
| 178 HeapRegion* hr() const { return _hr; } | |
| 179 | |
| 180 // For now. Could "expand" some tables in the future, so that this made | |
| 181 // sense. | |
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182 void add_reference(OopOrNarrowOopStar from, int tid); |
| 342 | 183 |
| 184 // Removes any entries shown by the given bitmaps to contain only dead | |
| 185 // objects. | |
| 186 void scrub(CardTableModRefBS* ctbs, BitMap* region_bm, BitMap* card_bm); | |
| 187 | |
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188 // Returns whether this remembered set (and all sub-sets) contain no entries. |
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189 bool is_empty() const; |
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190 |
| 342 | 191 size_t occupied() const; |
| 192 size_t occ_fine() const; | |
| 193 size_t occ_coarse() const; | |
| 194 size_t occ_sparse() const; | |
| 195 | |
| 196 static jint n_coarsenings() { return _n_coarsenings; } | |
| 197 | |
| 198 // Returns size in bytes. | |
| 199 // Not const because it takes a lock. | |
| 200 size_t mem_size() const; | |
| 201 static size_t static_mem_size(); | |
| 202 static size_t fl_mem_size(); | |
| 203 | |
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204 bool contains_reference(OopOrNarrowOopStar from) const; |
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205 bool contains_reference_locked(OopOrNarrowOopStar from) const; |
| 342 | 206 |
| 207 void clear(); | |
| 208 | |
| 209 // Specifically clear the from_card_cache. | |
| 210 void clear_fcc(); | |
| 211 | |
| 2173 | 212 void do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task); |
| 213 | |
| 342 | 214 // Declare the heap size (in # of regions) to the OtherRegionsTable. |
| 215 // (Uses it to initialize from_card_cache). | |
| 20337 | 216 static void initialize(uint max_regions); |
| 342 | 217 |
| 20337 | 218 // Declares that regions between start_idx <= i < start_idx + num_regions are |
| 219 // not in use. Make sure that any entries for these regions are invalid. | |
| 220 static void invalidate(uint start_idx, size_t num_regions); | |
| 342 | 221 |
| 222 static void print_from_card_cache(); | |
| 223 }; | |
| 224 | |
| 6197 | 225 class HeapRegionRemSet : public CHeapObj<mtGC> { |
| 342 | 226 friend class VMStructs; |
| 227 friend class HeapRegionRemSetIterator; | |
| 228 | |
| 229 public: | |
| 230 enum Event { | |
| 231 Event_EvacStart, Event_EvacEnd, Event_RSUpdateEnd | |
| 232 }; | |
| 233 | |
| 234 private: | |
| 235 G1BlockOffsetSharedArray* _bosa; | |
| 236 G1BlockOffsetSharedArray* bosa() const { return _bosa; } | |
| 237 | |
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238 // A set of code blobs (nmethods) whose code contains pointers into |
| 12080 | 239 // the region that owns this RSet. |
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240 G1CodeRootSet _code_roots; |
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241 |
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242 Mutex _m; |
| 12080 | 243 |
| 342 | 244 OtherRegionsTable _other_regions; |
| 245 | |
| 246 enum ParIterState { Unclaimed, Claimed, Complete }; | |
| 1261 | 247 volatile ParIterState _iter_state; |
| 248 volatile jlong _iter_claimed; | |
| 342 | 249 |
| 250 // Unused unless G1RecordHRRSOops is true. | |
| 251 | |
| 252 static const int MaxRecorded = 1000000; | |
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253 static OopOrNarrowOopStar* _recorded_oops; |
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254 static HeapWord** _recorded_cards; |
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255 static HeapRegion** _recorded_regions; |
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256 static int _n_recorded; |
| 342 | 257 |
| 258 static const int MaxRecordedEvents = 1000; | |
| 259 static Event* _recorded_events; | |
| 260 static int* _recorded_event_index; | |
| 261 static int _n_recorded_events; | |
| 262 | |
| 263 static void print_event(outputStream* str, Event evnt); | |
| 264 | |
| 265 public: | |
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266 HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, HeapRegion* hr); |
| 342 | 267 |
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268 static uint num_par_rem_sets(); |
| 1261 | 269 static void setup_remset_size(); |
| 342 | 270 |
| 271 HeapRegion* hr() const { | |
| 272 return _other_regions.hr(); | |
| 273 } | |
| 274 | |
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275 bool is_empty() const { |
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276 return (strong_code_roots_list_length() == 0) && _other_regions.is_empty(); |
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277 } |
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278 |
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279 size_t occupied() { |
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280 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); |
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281 return occupied_locked(); |
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282 } |
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283 size_t occupied_locked() { |
| 342 | 284 return _other_regions.occupied(); |
| 285 } | |
| 286 size_t occ_fine() const { | |
| 287 return _other_regions.occ_fine(); | |
| 288 } | |
| 289 size_t occ_coarse() const { | |
| 290 return _other_regions.occ_coarse(); | |
| 291 } | |
| 292 size_t occ_sparse() const { | |
| 293 return _other_regions.occ_sparse(); | |
| 294 } | |
| 295 | |
| 296 static jint n_coarsenings() { return OtherRegionsTable::n_coarsenings(); } | |
| 297 | |
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298 // Used in the sequential case. |
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299 void add_reference(OopOrNarrowOopStar from) { |
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300 _other_regions.add_reference(from, 0); |
| 342 | 301 } |
| 302 | |
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303 // Used in the parallel case. |
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304 void add_reference(OopOrNarrowOopStar from, int tid) { |
| 342 | 305 _other_regions.add_reference(from, tid); |
| 306 } | |
| 307 | |
| 308 // Removes any entries shown by the given bitmaps to contain only dead | |
| 309 // objects. | |
| 310 void scrub(CardTableModRefBS* ctbs, BitMap* region_bm, BitMap* card_bm); | |
| 311 | |
| 312 // The region is being reclaimed; clear its remset, and any mention of | |
| 313 // entries for this region in other remsets. | |
| 314 void clear(); | |
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315 void clear_locked(); |
| 342 | 316 |
| 317 // Attempt to claim the region. Returns true iff this call caused an | |
| 318 // atomic transition from Unclaimed to Claimed. | |
| 319 bool claim_iter(); | |
| 320 // Sets the iteration state to "complete". | |
| 321 void set_iter_complete(); | |
| 322 // Returns "true" iff the region's iteration is complete. | |
| 323 bool iter_is_complete(); | |
| 324 | |
| 1261 | 325 // Support for claiming blocks of cards during iteration |
| 326 size_t iter_claimed() const { return (size_t)_iter_claimed; } | |
| 327 // Claim the next block of cards | |
| 328 size_t iter_claimed_next(size_t step) { | |
| 329 size_t current, next; | |
| 330 do { | |
| 331 current = iter_claimed(); | |
| 332 next = current + step; | |
| 333 } while (Atomic::cmpxchg((jlong)next, &_iter_claimed, (jlong)current) != (jlong)current); | |
| 334 return current; | |
| 335 } | |
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336 void reset_for_par_iteration(); |
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337 |
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338 bool verify_ready_for_par_iteration() { |
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339 return (_iter_state == Unclaimed) && (_iter_claimed == 0); |
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340 } |
| 1261 | 341 |
| 342 | 342 // The actual # of bytes this hr_remset takes up. |
| 12080 | 343 // Note also includes the strong code root set. |
| 342 | 344 size_t mem_size() { |
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345 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); |
| 342 | 346 return _other_regions.mem_size() |
| 347 // This correction is necessary because the above includes the second | |
| 348 // part. | |
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349 + (sizeof(HeapRegionRemSet) - sizeof(OtherRegionsTable)) |
| 12080 | 350 + strong_code_roots_mem_size(); |
| 342 | 351 } |
| 352 | |
| 353 // Returns the memory occupancy of all static data structures associated | |
| 354 // with remembered sets. | |
| 355 static size_t static_mem_size() { | |
| 20494 | 356 return OtherRegionsTable::static_mem_size() + G1CodeRootSet::static_mem_size(); |
| 342 | 357 } |
| 358 | |
| 359 // Returns the memory occupancy of all free_list data structures associated | |
| 360 // with remembered sets. | |
| 361 static size_t fl_mem_size() { | |
| 20494 | 362 return OtherRegionsTable::fl_mem_size(); |
| 342 | 363 } |
| 364 | |
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365 bool contains_reference(OopOrNarrowOopStar from) const { |
| 342 | 366 return _other_regions.contains_reference(from); |
| 367 } | |
| 12080 | 368 |
| 369 // Routines for managing the list of code roots that point into | |
| 370 // the heap region that owns this RSet. | |
| 371 void add_strong_code_root(nmethod* nm); | |
| 20494 | 372 void add_strong_code_root_locked(nmethod* nm); |
| 12080 | 373 void remove_strong_code_root(nmethod* nm); |
| 374 | |
| 375 // Applies blk->do_code_blob() to each of the entries in | |
| 376 // the strong code roots list | |
| 377 void strong_code_roots_do(CodeBlobClosure* blk) const; | |
| 378 | |
| 20494 | 379 void clean_strong_code_roots(HeapRegion* hr); |
| 380 | |
| 12080 | 381 // Returns the number of elements in the strong code roots list |
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382 size_t strong_code_roots_list_length() const { |
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383 return _code_roots.length(); |
| 12080 | 384 } |
| 385 | |
| 386 // Returns true if the strong code roots contains the given | |
| 387 // nmethod. | |
| 388 bool strong_code_roots_list_contains(nmethod* nm) { | |
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389 return _code_roots.contains(nm); |
| 12080 | 390 } |
| 391 | |
| 392 // Returns the amount of memory, in bytes, currently | |
| 393 // consumed by the strong code roots. | |
| 394 size_t strong_code_roots_mem_size(); | |
| 395 | |
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396 void print() PRODUCT_RETURN; |
| 342 | 397 |
| 398 // Called during a stop-world phase to perform any deferred cleanups. | |
| 399 static void cleanup(); | |
| 400 | |
| 401 // Declare the heap size (in # of regions) to the HeapRegionRemSet(s). | |
| 402 // (Uses it to initialize from_card_cache). | |
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403 static void init_heap(uint max_regions) { |
| 20337 | 404 OtherRegionsTable::initialize(max_regions); |
| 342 | 405 } |
| 406 | |
| 20337 | 407 static void invalidate(uint start_idx, uint num_regions) { |
| 408 OtherRegionsTable::invalidate(start_idx, num_regions); | |
| 342 | 409 } |
| 410 | |
| 411 #ifndef PRODUCT | |
| 412 static void print_from_card_cache() { | |
| 413 OtherRegionsTable::print_from_card_cache(); | |
| 414 } | |
| 415 #endif | |
| 416 | |
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417 static void record(HeapRegion* hr, OopOrNarrowOopStar f); |
| 342 | 418 static void print_recorded(); |
| 419 static void record_event(Event evnt); | |
| 420 | |
| 2173 | 421 // These are wrappers for the similarly-named methods on |
| 422 // SparsePRT. Look at sparsePRT.hpp for more details. | |
| 423 static void reset_for_cleanup_tasks(); | |
| 424 void do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task); | |
| 425 static void finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task); | |
| 426 | |
| 342 | 427 // Run unit tests. |
| 428 #ifndef PRODUCT | |
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429 static void test_prt(); |
| 342 | 430 static void test(); |
| 431 #endif | |
| 432 }; | |
| 433 | |
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434 class HeapRegionRemSetIterator : public StackObj { |
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435 private: |
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436 // The region RSet over which we are iterating. |
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437 HeapRegionRemSet* _hrrs; |
| 342 | 438 |
| 439 // Local caching of HRRS fields. | |
| 440 const BitMap* _coarse_map; | |
| 441 | |
| 442 G1BlockOffsetSharedArray* _bosa; | |
| 443 G1CollectedHeap* _g1h; | |
| 444 | |
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445 // The number of cards yielded since initialization. |
| 342 | 446 size_t _n_yielded_fine; |
| 447 size_t _n_yielded_coarse; | |
| 448 size_t _n_yielded_sparse; | |
| 449 | |
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450 // Indicates what granularity of table that we are currently iterating over. |
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451 // We start iterating over the sparse table, progress to the fine grain |
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452 // table, and then finish with the coarse table. |
| 342 | 453 enum IterState { |
| 454 Sparse, | |
| 455 Fine, | |
| 456 Coarse | |
| 457 }; | |
| 458 IterState _is; | |
| 459 | |
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460 // For both Coarse and Fine remembered set iteration this contains the |
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461 // first card number of the heap region we currently iterate over. |
| 342 | 462 size_t _cur_region_card_offset; |
| 463 | |
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464 // Current region index for the Coarse remembered set iteration. |
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465 int _coarse_cur_region_index; |
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466 size_t _coarse_cur_region_cur_card; |
| 342 | 467 |
| 468 bool coarse_has_next(size_t& card_index); | |
| 469 | |
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470 // The PRT we are currently iterating over. |
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471 PerRegionTable* _fine_cur_prt; |
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472 // Card offset within the current PRT. |
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473 size_t _cur_card_in_prt; |
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474 |
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475 // Update internal variables when switching to the given PRT. |
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476 void switch_to_prt(PerRegionTable* prt); |
| 342 | 477 bool fine_has_next(); |
| 478 bool fine_has_next(size_t& card_index); | |
| 479 | |
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480 // The Sparse remembered set iterator. |
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481 SparsePRTIter _sparse_iter; |
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482 |
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483 public: |
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484 HeapRegionRemSetIterator(HeapRegionRemSet* hrrs); |
| 342 | 485 |
| 486 // If there remains one or more cards to be yielded, returns true and | |
| 487 // sets "card_index" to one of those cards (which is then considered | |
| 488 // yielded.) Otherwise, returns false (and leaves "card_index" | |
| 489 // undefined.) | |
| 490 bool has_next(size_t& card_index); | |
| 491 | |
| 492 size_t n_yielded_fine() { return _n_yielded_fine; } | |
| 493 size_t n_yielded_coarse() { return _n_yielded_coarse; } | |
| 494 size_t n_yielded_sparse() { return _n_yielded_sparse; } | |
| 495 size_t n_yielded() { | |
| 496 return n_yielded_fine() + n_yielded_coarse() + n_yielded_sparse(); | |
| 497 } | |
| 498 }; | |
| 499 | |
| 1972 | 500 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONREMSET_HPP |