Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.hpp @ 17755:96b1c2e06e25
8027295: Free CSet takes ~50% of young pause time
Summary: Improve fast card cache iteration and avoid taking locks when freeing the collection set.
Reviewed-by: brutisso
author | tschatzl |
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date | Mon, 24 Mar 2014 15:30:36 +0100 |
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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 |
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; | |
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124 static uint _from_card_cache_max_regions; |
342 | 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). | |
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173 static void init_from_card_cache(uint max_regions); |
342 | 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. | |
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177 static void shrink_from_card_cache(uint new_n_regs); |
342 | 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 |
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225 static uint 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(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(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 |