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annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.hpp @ 6198:24b9c7f4cae6
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date | Mon, 02 Jul 2012 13:11:28 -0400 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONREMSET_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONREMSET_HPP | |
27 | |
28 #include "gc_implementation/g1/sparsePRT.hpp" | |
29 | |
342 | 30 // Remembered set for a heap region. Represent a set of "cards" that |
31 // contain pointers into the owner heap region. Cards are defined somewhat | |
32 // abstractly, in terms of what the "BlockOffsetTable" in use can parse. | |
33 | |
34 class G1CollectedHeap; | |
35 class G1BlockOffsetSharedArray; | |
36 class HeapRegion; | |
37 class HeapRegionRemSetIterator; | |
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38 class PerRegionTable; |
342 | 39 class SparsePRT; |
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 | |
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82 PerRegionTable** _fine_grain_regions; |
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83 size_t _n_fine_entries; |
342 | 84 |
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85 // Used to sample a subset of the fine grain PRTs to determine which |
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86 // PRT to evict and coarsen. |
342 | 87 size_t _fine_eviction_start; |
88 static size_t _fine_eviction_stride; | |
89 static size_t _fine_eviction_sample_size; | |
90 | |
91 SparsePRT _sparse_table; | |
92 | |
93 // These are static after init. | |
94 static size_t _max_fine_entries; | |
95 static size_t _mod_max_fine_entries_mask; | |
96 | |
97 // Requires "prt" to be the first element of the bucket list appropriate | |
98 // for "hr". If this list contains an entry for "hr", return it, | |
99 // otherwise return "NULL". | |
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100 PerRegionTable* find_region_table(size_t ind, HeapRegion* hr) const; |
342 | 101 |
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102 // Find, delete, and return a candidate PerRegionTable, if any exists, |
342 | 103 // adding the deleted region to the coarse bitmap. Requires the caller |
104 // to hold _m, and the fine-grain table to be full. | |
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105 PerRegionTable* delete_region_table(); |
342 | 106 |
107 // If a PRT for "hr" is in the bucket list indicated by "ind" (which must | |
108 // be the correct index for "hr"), delete it and return true; else return | |
109 // false. | |
110 bool del_single_region_table(size_t ind, HeapRegion* hr); | |
111 | |
112 // Indexed by thread X heap region, to minimize thread contention. | |
113 static int** _from_card_cache; | |
114 static size_t _from_card_cache_max_regions; | |
115 static size_t _from_card_cache_mem_size; | |
116 | |
117 public: | |
118 OtherRegionsTable(HeapRegion* hr); | |
119 | |
120 HeapRegion* hr() const { return _hr; } | |
121 | |
122 // For now. Could "expand" some tables in the future, so that this made | |
123 // sense. | |
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124 void add_reference(OopOrNarrowOopStar from, int tid); |
342 | 125 |
126 // Removes any entries shown by the given bitmaps to contain only dead | |
127 // objects. | |
128 void scrub(CardTableModRefBS* ctbs, BitMap* region_bm, BitMap* card_bm); | |
129 | |
130 // Not const because it takes a lock. | |
131 size_t occupied() const; | |
132 size_t occ_fine() const; | |
133 size_t occ_coarse() const; | |
134 size_t occ_sparse() const; | |
135 | |
136 static jint n_coarsenings() { return _n_coarsenings; } | |
137 | |
138 // Returns size in bytes. | |
139 // Not const because it takes a lock. | |
140 size_t mem_size() const; | |
141 static size_t static_mem_size(); | |
142 static size_t fl_mem_size(); | |
143 | |
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144 bool contains_reference(OopOrNarrowOopStar from) const; |
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145 bool contains_reference_locked(OopOrNarrowOopStar from) const; |
342 | 146 |
147 void clear(); | |
148 | |
149 // Specifically clear the from_card_cache. | |
150 void clear_fcc(); | |
151 | |
152 // "from_hr" is being cleared; remove any entries from it. | |
153 void clear_incoming_entry(HeapRegion* from_hr); | |
154 | |
2173 | 155 void do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task); |
156 | |
342 | 157 // Declare the heap size (in # of regions) to the OtherRegionsTable. |
158 // (Uses it to initialize from_card_cache). | |
159 static void init_from_card_cache(size_t max_regions); | |
160 | |
161 // Declares that only regions i s.t. 0 <= i < new_n_regs are in use. | |
162 // Make sure any entries for higher regions are invalid. | |
163 static void shrink_from_card_cache(size_t new_n_regs); | |
164 | |
165 static void print_from_card_cache(); | |
166 }; | |
167 | |
6197 | 168 class HeapRegionRemSet : public CHeapObj<mtGC> { |
342 | 169 friend class VMStructs; |
170 friend class HeapRegionRemSetIterator; | |
171 | |
172 public: | |
173 enum Event { | |
174 Event_EvacStart, Event_EvacEnd, Event_RSUpdateEnd | |
175 }; | |
176 | |
177 private: | |
178 G1BlockOffsetSharedArray* _bosa; | |
179 G1BlockOffsetSharedArray* bosa() const { return _bosa; } | |
180 | |
181 OtherRegionsTable _other_regions; | |
182 | |
183 enum ParIterState { Unclaimed, Claimed, Complete }; | |
1261 | 184 volatile ParIterState _iter_state; |
185 volatile jlong _iter_claimed; | |
342 | 186 |
187 // Unused unless G1RecordHRRSOops is true. | |
188 | |
189 static const int MaxRecorded = 1000000; | |
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190 static OopOrNarrowOopStar* _recorded_oops; |
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191 static HeapWord** _recorded_cards; |
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192 static HeapRegion** _recorded_regions; |
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193 static int _n_recorded; |
342 | 194 |
195 static const int MaxRecordedEvents = 1000; | |
196 static Event* _recorded_events; | |
197 static int* _recorded_event_index; | |
198 static int _n_recorded_events; | |
199 | |
200 static void print_event(outputStream* str, Event evnt); | |
201 | |
202 public: | |
203 HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, | |
204 HeapRegion* hr); | |
205 | |
206 static int num_par_rem_sets(); | |
1261 | 207 static void setup_remset_size(); |
342 | 208 |
209 HeapRegion* hr() const { | |
210 return _other_regions.hr(); | |
211 } | |
212 | |
213 size_t occupied() const { | |
214 return _other_regions.occupied(); | |
215 } | |
216 size_t occ_fine() const { | |
217 return _other_regions.occ_fine(); | |
218 } | |
219 size_t occ_coarse() const { | |
220 return _other_regions.occ_coarse(); | |
221 } | |
222 size_t occ_sparse() const { | |
223 return _other_regions.occ_sparse(); | |
224 } | |
225 | |
226 static jint n_coarsenings() { return OtherRegionsTable::n_coarsenings(); } | |
227 | |
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228 // Used in the sequential case. |
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229 void add_reference(OopOrNarrowOopStar from) { |
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230 _other_regions.add_reference(from, 0); |
342 | 231 } |
232 | |
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233 // Used in the parallel case. |
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234 void add_reference(OopOrNarrowOopStar from, int tid) { |
342 | 235 _other_regions.add_reference(from, tid); |
236 } | |
237 | |
238 // Removes any entries shown by the given bitmaps to contain only dead | |
239 // objects. | |
240 void scrub(CardTableModRefBS* ctbs, BitMap* region_bm, BitMap* card_bm); | |
241 | |
242 // The region is being reclaimed; clear its remset, and any mention of | |
243 // entries for this region in other remsets. | |
244 void clear(); | |
245 | |
246 // Attempt to claim the region. Returns true iff this call caused an | |
247 // atomic transition from Unclaimed to Claimed. | |
248 bool claim_iter(); | |
249 // Sets the iteration state to "complete". | |
250 void set_iter_complete(); | |
251 // Returns "true" iff the region's iteration is complete. | |
252 bool iter_is_complete(); | |
253 | |
1261 | 254 // Support for claiming blocks of cards during iteration |
255 size_t iter_claimed() const { return (size_t)_iter_claimed; } | |
256 // Claim the next block of cards | |
257 size_t iter_claimed_next(size_t step) { | |
258 size_t current, next; | |
259 do { | |
260 current = iter_claimed(); | |
261 next = current + step; | |
262 } while (Atomic::cmpxchg((jlong)next, &_iter_claimed, (jlong)current) != (jlong)current); | |
263 return current; | |
264 } | |
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265 void reset_for_par_iteration(); |
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266 |
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267 bool verify_ready_for_par_iteration() { |
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268 return (_iter_state == Unclaimed) && (_iter_claimed == 0); |
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269 } |
1261 | 270 |
342 | 271 // Initialize the given iterator to iterate over this rem set. |
272 void init_iterator(HeapRegionRemSetIterator* iter) const; | |
273 | |
274 // The actual # of bytes this hr_remset takes up. | |
275 size_t mem_size() { | |
276 return _other_regions.mem_size() | |
277 // This correction is necessary because the above includes the second | |
278 // part. | |
279 + sizeof(this) - sizeof(OtherRegionsTable); | |
280 } | |
281 | |
282 // Returns the memory occupancy of all static data structures associated | |
283 // with remembered sets. | |
284 static size_t static_mem_size() { | |
285 return OtherRegionsTable::static_mem_size(); | |
286 } | |
287 | |
288 // Returns the memory occupancy of all free_list data structures associated | |
289 // with remembered sets. | |
290 static size_t fl_mem_size() { | |
291 return OtherRegionsTable::fl_mem_size(); | |
292 } | |
293 | |
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294 bool contains_reference(OopOrNarrowOopStar from) const { |
342 | 295 return _other_regions.contains_reference(from); |
296 } | |
297 void print() const; | |
298 | |
299 // Called during a stop-world phase to perform any deferred cleanups. | |
300 static void cleanup(); | |
301 | |
302 // Declare the heap size (in # of regions) to the HeapRegionRemSet(s). | |
303 // (Uses it to initialize from_card_cache). | |
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304 static void init_heap(uint max_regions) { |
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305 OtherRegionsTable::init_from_card_cache((size_t) max_regions); |
342 | 306 } |
307 | |
308 // Declares that only regions i s.t. 0 <= i < new_n_regs are in use. | |
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309 static void shrink_heap(uint new_n_regs) { |
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310 OtherRegionsTable::shrink_from_card_cache((size_t) new_n_regs); |
342 | 311 } |
312 | |
313 #ifndef PRODUCT | |
314 static void print_from_card_cache() { | |
315 OtherRegionsTable::print_from_card_cache(); | |
316 } | |
317 #endif | |
318 | |
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319 static void record(HeapRegion* hr, OopOrNarrowOopStar f); |
342 | 320 static void print_recorded(); |
321 static void record_event(Event evnt); | |
322 | |
2173 | 323 // These are wrappers for the similarly-named methods on |
324 // SparsePRT. Look at sparsePRT.hpp for more details. | |
325 static void reset_for_cleanup_tasks(); | |
326 void do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task); | |
327 static void finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task); | |
328 | |
342 | 329 // Run unit tests. |
330 #ifndef PRODUCT | |
331 static void test(); | |
332 #endif | |
333 }; | |
334 | |
6197 | 335 class HeapRegionRemSetIterator : public CHeapObj<mtGC> { |
342 | 336 |
337 // The region over which we're iterating. | |
338 const HeapRegionRemSet* _hrrs; | |
339 | |
340 // Local caching of HRRS fields. | |
341 const BitMap* _coarse_map; | |
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342 PerRegionTable** _fine_grain_regions; |
342 | 343 |
344 G1BlockOffsetSharedArray* _bosa; | |
345 G1CollectedHeap* _g1h; | |
346 | |
347 // The number yielded since initialization. | |
348 size_t _n_yielded_fine; | |
349 size_t _n_yielded_coarse; | |
350 size_t _n_yielded_sparse; | |
351 | |
352 // If true we're iterating over the coarse table; if false the fine | |
353 // table. | |
354 enum IterState { | |
355 Sparse, | |
356 Fine, | |
357 Coarse | |
358 }; | |
359 IterState _is; | |
360 | |
361 // In both kinds of iteration, heap offset of first card of current | |
362 // region. | |
363 size_t _cur_region_card_offset; | |
364 // Card offset within cur region. | |
365 size_t _cur_region_cur_card; | |
366 | |
367 // Coarse table iteration fields: | |
368 | |
369 // Current region index; | |
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370 int _coarse_cur_region_index; |
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371 size_t _coarse_cur_region_cur_card; |
342 | 372 |
373 bool coarse_has_next(size_t& card_index); | |
374 | |
375 // Fine table iteration fields: | |
376 | |
377 // Index of bucket-list we're working on. | |
378 int _fine_array_index; | |
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379 |
342 | 380 // Per Region Table we're doing within current bucket list. |
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381 PerRegionTable* _fine_cur_prt; |
342 | 382 |
383 /* SparsePRT::*/ SparsePRTIter _sparse_iter; | |
384 | |
385 void fine_find_next_non_null_prt(); | |
386 | |
387 bool fine_has_next(); | |
388 bool fine_has_next(size_t& card_index); | |
389 | |
390 public: | |
391 // We require an iterator to be initialized before use, so the | |
392 // constructor does little. | |
393 HeapRegionRemSetIterator(); | |
394 | |
395 void initialize(const HeapRegionRemSet* hrrs); | |
396 | |
397 // If there remains one or more cards to be yielded, returns true and | |
398 // sets "card_index" to one of those cards (which is then considered | |
399 // yielded.) Otherwise, returns false (and leaves "card_index" | |
400 // undefined.) | |
401 bool has_next(size_t& card_index); | |
402 | |
403 size_t n_yielded_fine() { return _n_yielded_fine; } | |
404 size_t n_yielded_coarse() { return _n_yielded_coarse; } | |
405 size_t n_yielded_sparse() { return _n_yielded_sparse; } | |
406 size_t n_yielded() { | |
407 return n_yielded_fine() + n_yielded_coarse() + n_yielded_sparse(); | |
408 } | |
409 }; | |
410 | |
1972 | 411 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONREMSET_HPP |