Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp @ 19083:09292c24d555
LSStackSlotAllocator: hide inner class.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Sat, 31 Jan 2015 11:07:15 +0100 |
parents | 52b4284cb496 |
children | 7848fc12602b |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
0 | 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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_COMPACTIBLEFREELISTSPACE_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_COMPACTIBLEFREELISTSPACE_HPP | |
27 | |
6885 | 28 #include "gc_implementation/concurrentMarkSweep/adaptiveFreeList.hpp" |
1972 | 29 #include "gc_implementation/concurrentMarkSweep/promotionInfo.hpp" |
6026 | 30 #include "memory/binaryTreeDictionary.hpp" |
1972 | 31 #include "memory/blockOffsetTable.inline.hpp" |
6026 | 32 #include "memory/freeList.hpp" |
1972 | 33 #include "memory/space.hpp" |
34 | |
0 | 35 // Classes in support of keeping track of promotions into a non-Contiguous |
36 // space, in this case a CompactibleFreeListSpace. | |
37 | |
38 // Forward declarations | |
39 class CompactibleFreeListSpace; | |
40 class BlkClosure; | |
41 class BlkClosureCareful; | |
6885 | 42 class FreeChunk; |
0 | 43 class UpwardsObjectClosure; |
44 class ObjectClosureCareful; | |
45 class Klass; | |
46 | |
47 class LinearAllocBlock VALUE_OBJ_CLASS_SPEC { | |
48 public: | |
49 LinearAllocBlock() : _ptr(0), _word_size(0), _refillSize(0), | |
50 _allocation_size_limit(0) {} | |
51 void set(HeapWord* ptr, size_t word_size, size_t refill_size, | |
52 size_t allocation_size_limit) { | |
53 _ptr = ptr; | |
54 _word_size = word_size; | |
55 _refillSize = refill_size; | |
56 _allocation_size_limit = allocation_size_limit; | |
57 } | |
58 HeapWord* _ptr; | |
59 size_t _word_size; | |
60 size_t _refillSize; | |
61 size_t _allocation_size_limit; // largest size that will be allocated | |
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62 |
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63 void print_on(outputStream* st) const; |
0 | 64 }; |
65 | |
66 // Concrete subclass of CompactibleSpace that implements | |
67 // a free list space, such as used in the concurrent mark sweep | |
68 // generation. | |
69 | |
70 class CompactibleFreeListSpace: public CompactibleSpace { | |
71 friend class VMStructs; | |
72 friend class ConcurrentMarkSweepGeneration; | |
73 friend class ASConcurrentMarkSweepGeneration; | |
74 friend class CMSCollector; | |
75 // Local alloc buffer for promotion into this space. | |
76 friend class CFLS_LAB; | |
77 | |
78 // "Size" of chunks of work (executed during parallel remark phases | |
79 // of CMS collection); this probably belongs in CMSCollector, although | |
80 // it's cached here because it's used in | |
81 // initialize_sequential_subtasks_for_rescan() which modifies | |
82 // par_seq_tasks which also lives in Space. XXX | |
83 const size_t _rescan_task_size; | |
84 const size_t _marking_task_size; | |
85 | |
86 // Yet another sequential tasks done structure. This supports | |
87 // CMS GC, where we have threads dynamically | |
88 // claiming sub-tasks from a larger parallel task. | |
89 SequentialSubTasksDone _conc_par_seq_tasks; | |
90 | |
91 BlockOffsetArrayNonContigSpace _bt; | |
92 | |
93 CMSCollector* _collector; | |
94 ConcurrentMarkSweepGeneration* _gen; | |
95 | |
96 // Data structures for free blocks (used during allocation/sweeping) | |
97 | |
98 // Allocation is done linearly from two different blocks depending on | |
99 // whether the request is small or large, in an effort to reduce | |
100 // fragmentation. We assume that any locking for allocation is done | |
101 // by the containing generation. Thus, none of the methods in this | |
102 // space are re-entrant. | |
103 enum SomeConstants { | |
104 SmallForLinearAlloc = 16, // size < this then use _sLAB | |
105 SmallForDictionary = 257, // size < this then use _indexedFreeList | |
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106 IndexSetSize = SmallForDictionary // keep this odd-sized |
0 | 107 }; |
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108 static size_t IndexSetStart; |
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109 static size_t IndexSetStride; |
0 | 110 |
111 private: | |
112 enum FitStrategyOptions { | |
113 FreeBlockStrategyNone = 0, | |
114 FreeBlockBestFitFirst | |
115 }; | |
116 | |
117 PromotionInfo _promoInfo; | |
118 | |
119 // helps to impose a global total order on freelistLock ranks; | |
120 // assumes that CFLSpace's are allocated in global total order | |
121 static int _lockRank; | |
122 | |
123 // a lock protecting the free lists and free blocks; | |
124 // mutable because of ubiquity of locking even for otherwise const methods | |
125 mutable Mutex _freelistLock; | |
126 // locking verifier convenience function | |
127 void assert_locked() const PRODUCT_RETURN; | |
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128 void assert_locked(const Mutex* lock) const PRODUCT_RETURN; |
0 | 129 |
130 // Linear allocation blocks | |
131 LinearAllocBlock _smallLinearAllocBlock; | |
132 | |
6026 | 133 FreeBlockDictionary<FreeChunk>::DictionaryChoice _dictionaryChoice; |
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134 AFLBinaryTreeDictionary* _dictionary; // ptr to dictionary for large size blocks |
0 | 135 |
6885 | 136 AdaptiveFreeList<FreeChunk> _indexedFreeList[IndexSetSize]; |
0 | 137 // indexed array for small size blocks |
138 // allocation stategy | |
139 bool _fitStrategy; // Use best fit strategy. | |
140 bool _adaptive_freelists; // Use adaptive freelists | |
141 | |
142 // This is an address close to the largest free chunk in the heap. | |
143 // It is currently assumed to be at the end of the heap. Free | |
144 // chunks with addresses greater than nearLargestChunk are coalesced | |
145 // in an effort to maintain a large chunk at the end of the heap. | |
146 HeapWord* _nearLargestChunk; | |
147 | |
148 // Used to keep track of limit of sweep for the space | |
149 HeapWord* _sweep_limit; | |
150 | |
151 // Support for compacting cms | |
152 HeapWord* cross_threshold(HeapWord* start, HeapWord* end); | |
153 HeapWord* forward(oop q, size_t size, CompactPoint* cp, HeapWord* compact_top); | |
154 | |
155 // Initialization helpers. | |
156 void initializeIndexedFreeListArray(); | |
157 | |
158 // Extra stuff to manage promotion parallelism. | |
159 | |
160 // a lock protecting the dictionary during par promotion allocation. | |
161 mutable Mutex _parDictionaryAllocLock; | |
162 Mutex* parDictionaryAllocLock() const { return &_parDictionaryAllocLock; } | |
163 | |
164 // Locks protecting the exact lists during par promotion allocation. | |
165 Mutex* _indexedFreeListParLocks[IndexSetSize]; | |
166 | |
167 // Attempt to obtain up to "n" blocks of the size "word_sz" (which is | |
168 // required to be smaller than "IndexSetSize".) If successful, | |
169 // adds them to "fl", which is required to be an empty free list. | |
170 // If the count of "fl" is negative, it's absolute value indicates a | |
171 // number of free chunks that had been previously "borrowed" from global | |
172 // list of size "word_sz", and must now be decremented. | |
6885 | 173 void par_get_chunk_of_blocks(size_t word_sz, size_t n, AdaptiveFreeList<FreeChunk>* fl); |
0 | 174 |
175 // Allocation helper functions | |
176 // Allocate using a strategy that takes from the indexed free lists | |
177 // first. This allocation strategy assumes a companion sweeping | |
178 // strategy that attempts to keep the needed number of chunks in each | |
179 // indexed free lists. | |
180 HeapWord* allocate_adaptive_freelists(size_t size); | |
181 // Allocate from the linear allocation buffers first. This allocation | |
182 // strategy assumes maximal coalescing can maintain chunks large enough | |
183 // to be used as linear allocation buffers. | |
184 HeapWord* allocate_non_adaptive_freelists(size_t size); | |
185 | |
186 // Gets a chunk from the linear allocation block (LinAB). If there | |
187 // is not enough space in the LinAB, refills it. | |
188 HeapWord* getChunkFromLinearAllocBlock(LinearAllocBlock* blk, size_t size); | |
189 HeapWord* getChunkFromSmallLinearAllocBlock(size_t size); | |
190 // Get a chunk from the space remaining in the linear allocation block. Do | |
191 // not attempt to refill if the space is not available, return NULL. Do the | |
192 // repairs on the linear allocation block as appropriate. | |
193 HeapWord* getChunkFromLinearAllocBlockRemainder(LinearAllocBlock* blk, size_t size); | |
194 inline HeapWord* getChunkFromSmallLinearAllocBlockRemainder(size_t size); | |
195 | |
196 // Helper function for getChunkFromIndexedFreeList. | |
197 // Replenish the indexed free list for this "size". Do not take from an | |
198 // underpopulated size. | |
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199 FreeChunk* getChunkFromIndexedFreeListHelper(size_t size, bool replenish = true); |
0 | 200 |
201 // Get a chunk from the indexed free list. If the indexed free list | |
202 // does not have a free chunk, try to replenish the indexed free list | |
203 // then get the free chunk from the replenished indexed free list. | |
204 inline FreeChunk* getChunkFromIndexedFreeList(size_t size); | |
205 | |
206 // The returned chunk may be larger than requested (or null). | |
207 FreeChunk* getChunkFromDictionary(size_t size); | |
208 // The returned chunk is the exact size requested (or null). | |
209 FreeChunk* getChunkFromDictionaryExact(size_t size); | |
210 | |
211 // Find a chunk in the indexed free list that is the best | |
212 // fit for size "numWords". | |
213 FreeChunk* bestFitSmall(size_t numWords); | |
214 // For free list "fl" of chunks of size > numWords, | |
215 // remove a chunk, split off a chunk of size numWords | |
216 // and return it. The split off remainder is returned to | |
217 // the free lists. The old name for getFromListGreater | |
218 // was lookInListGreater. | |
6885 | 219 FreeChunk* getFromListGreater(AdaptiveFreeList<FreeChunk>* fl, size_t numWords); |
0 | 220 // Get a chunk in the indexed free list or dictionary, |
221 // by considering a larger chunk and splitting it. | |
222 FreeChunk* getChunkFromGreater(size_t numWords); | |
223 // Verify that the given chunk is in the indexed free lists. | |
224 bool verifyChunkInIndexedFreeLists(FreeChunk* fc) const; | |
225 // Remove the specified chunk from the indexed free lists. | |
226 void removeChunkFromIndexedFreeList(FreeChunk* fc); | |
227 // Remove the specified chunk from the dictionary. | |
228 void removeChunkFromDictionary(FreeChunk* fc); | |
229 // Split a free chunk into a smaller free chunk of size "new_size". | |
230 // Return the smaller free chunk and return the remainder to the | |
231 // free lists. | |
232 FreeChunk* splitChunkAndReturnRemainder(FreeChunk* chunk, size_t new_size); | |
233 // Add a chunk to the free lists. | |
234 void addChunkToFreeLists(HeapWord* chunk, size_t size); | |
235 // Add a chunk to the free lists, preferring to suffix it | |
236 // to the last free chunk at end of space if possible, and | |
237 // updating the block census stats as well as block offset table. | |
238 // Take any locks as appropriate if we are multithreaded. | |
239 void addChunkToFreeListsAtEndRecordingStats(HeapWord* chunk, size_t size); | |
240 // Add a free chunk to the indexed free lists. | |
241 void returnChunkToFreeList(FreeChunk* chunk); | |
242 // Add a free chunk to the dictionary. | |
243 void returnChunkToDictionary(FreeChunk* chunk); | |
244 | |
245 // Functions for maintaining the linear allocation buffers (LinAB). | |
246 // Repairing a linear allocation block refers to operations | |
247 // performed on the remainder of a LinAB after an allocation | |
248 // has been made from it. | |
249 void repairLinearAllocationBlocks(); | |
250 void repairLinearAllocBlock(LinearAllocBlock* blk); | |
251 void refillLinearAllocBlock(LinearAllocBlock* blk); | |
252 void refillLinearAllocBlockIfNeeded(LinearAllocBlock* blk); | |
253 void refillLinearAllocBlocksIfNeeded(); | |
254 | |
255 void verify_objects_initialized() const; | |
256 | |
257 // Statistics reporting helper functions | |
258 void reportFreeListStatistics() const; | |
259 void reportIndexedFreeListStatistics() const; | |
260 size_t maxChunkSizeInIndexedFreeLists() const; | |
261 size_t numFreeBlocksInIndexedFreeLists() const; | |
262 // Accessor | |
263 HeapWord* unallocated_block() const { | |
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264 if (BlockOffsetArrayUseUnallocatedBlock) { |
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265 HeapWord* ub = _bt.unallocated_block(); |
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266 assert(ub >= bottom() && |
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267 ub <= end(), "space invariant"); |
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268 return ub; |
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269 } else { |
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270 return end(); |
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271 } |
0 | 272 } |
273 void freed(HeapWord* start, size_t size) { | |
274 _bt.freed(start, size); | |
275 } | |
276 | |
277 protected: | |
278 // reset the indexed free list to its initial empty condition. | |
279 void resetIndexedFreeListArray(); | |
280 // reset to an initial state with a single free block described | |
281 // by the MemRegion parameter. | |
282 void reset(MemRegion mr); | |
283 // Return the total number of words in the indexed free lists. | |
284 size_t totalSizeInIndexedFreeLists() const; | |
285 | |
286 public: | |
287 // Constructor... | |
288 CompactibleFreeListSpace(BlockOffsetSharedArray* bs, MemRegion mr, | |
289 bool use_adaptive_freelists, | |
6026 | 290 FreeBlockDictionary<FreeChunk>::DictionaryChoice); |
0 | 291 // accessors |
292 bool bestFitFirst() { return _fitStrategy == FreeBlockBestFitFirst; } | |
6026 | 293 FreeBlockDictionary<FreeChunk>* dictionary() const { return _dictionary; } |
0 | 294 HeapWord* nearLargestChunk() const { return _nearLargestChunk; } |
295 void set_nearLargestChunk(HeapWord* v) { _nearLargestChunk = v; } | |
296 | |
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297 // Set CMS global values |
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298 static void set_cms_values(); |
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299 |
0 | 300 // Return the free chunk at the end of the space. If no such |
301 // chunk exists, return NULL. | |
302 FreeChunk* find_chunk_at_end(); | |
303 | |
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304 bool adaptive_freelists() const { return _adaptive_freelists; } |
0 | 305 |
306 void set_collector(CMSCollector* collector) { _collector = collector; } | |
307 | |
308 // Support for parallelization of rescan and marking | |
309 const size_t rescan_task_size() const { return _rescan_task_size; } | |
310 const size_t marking_task_size() const { return _marking_task_size; } | |
311 SequentialSubTasksDone* conc_par_seq_tasks() {return &_conc_par_seq_tasks; } | |
312 void initialize_sequential_subtasks_for_rescan(int n_threads); | |
313 void initialize_sequential_subtasks_for_marking(int n_threads, | |
314 HeapWord* low = NULL); | |
315 | |
316 // Space enquiries | |
317 size_t used() const; | |
318 size_t free() const; | |
319 size_t max_alloc_in_words() const; | |
320 // XXX: should have a less conservative used_region() than that of | |
321 // Space; we could consider keeping track of highest allocated | |
322 // address and correcting that at each sweep, as the sweeper | |
323 // goes through the entire allocated part of the generation. We | |
324 // could also use that information to keep the sweeper from | |
325 // sweeping more than is necessary. The allocator and sweeper will | |
326 // of course need to synchronize on this, since the sweeper will | |
327 // try to bump down the address and the allocator will try to bump it up. | |
328 // For now, however, we'll just use the default used_region() | |
329 // which overestimates the region by returning the entire | |
330 // committed region (this is safe, but inefficient). | |
331 | |
332 // Returns a subregion of the space containing all the objects in | |
333 // the space. | |
334 MemRegion used_region() const { | |
335 return MemRegion(bottom(), | |
336 BlockOffsetArrayUseUnallocatedBlock ? | |
337 unallocated_block() : end()); | |
338 } | |
339 | |
340 bool is_in(const void* p) const { | |
341 return used_region().contains(p); | |
342 } | |
343 | |
344 virtual bool is_free_block(const HeapWord* p) const; | |
345 | |
346 // Resizing support | |
347 void set_end(HeapWord* value); // override | |
348 | |
349 // mutual exclusion support | |
350 Mutex* freelistLock() const { return &_freelistLock; } | |
351 | |
352 // Iteration support | |
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353 void oop_iterate(MemRegion mr, ExtendedOopClosure* cl); |
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354 void oop_iterate(ExtendedOopClosure* cl); |
0 | 355 |
356 void object_iterate(ObjectClosure* blk); | |
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357 // Apply the closure to each object in the space whose references |
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358 // point to objects in the heap. The usage of CompactibleFreeListSpace |
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359 // by the ConcurrentMarkSweepGeneration for concurrent GC's allows |
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360 // objects in the space with references to objects that are no longer |
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361 // valid. For example, an object may reference another object |
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362 // that has already been sweep up (collected). This method uses |
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363 // obj_is_alive() to determine whether it is safe to iterate of |
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364 // an object. |
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365 void safe_object_iterate(ObjectClosure* blk); |
0 | 366 void object_iterate_mem(MemRegion mr, UpwardsObjectClosure* cl); |
367 | |
368 // Requires that "mr" be entirely within the space. | |
369 // Apply "cl->do_object" to all objects that intersect with "mr". | |
370 // If the iteration encounters an unparseable portion of the region, | |
371 // terminate the iteration and return the address of the start of the | |
372 // subregion that isn't done. Return of "NULL" indicates that the | |
373 // interation completed. | |
374 virtual HeapWord* | |
375 object_iterate_careful_m(MemRegion mr, | |
376 ObjectClosureCareful* cl); | |
377 virtual HeapWord* | |
378 object_iterate_careful(ObjectClosureCareful* cl); | |
379 | |
380 // Override: provides a DCTO_CL specific to this kind of space. | |
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381 DirtyCardToOopClosure* new_dcto_cl(ExtendedOopClosure* cl, |
0 | 382 CardTableModRefBS::PrecisionStyle precision, |
383 HeapWord* boundary); | |
384 | |
385 void blk_iterate(BlkClosure* cl); | |
386 void blk_iterate_careful(BlkClosureCareful* cl); | |
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387 HeapWord* block_start_const(const void* p) const; |
0 | 388 HeapWord* block_start_careful(const void* p) const; |
389 size_t block_size(const HeapWord* p) const; | |
390 size_t block_size_no_stall(HeapWord* p, const CMSCollector* c) const; | |
391 bool block_is_obj(const HeapWord* p) const; | |
392 bool obj_is_alive(const HeapWord* p) const; | |
393 size_t block_size_nopar(const HeapWord* p) const; | |
394 bool block_is_obj_nopar(const HeapWord* p) const; | |
395 | |
396 // iteration support for promotion | |
397 void save_marks(); | |
398 bool no_allocs_since_save_marks(); | |
399 | |
400 // iteration support for sweeping | |
401 void save_sweep_limit() { | |
402 _sweep_limit = BlockOffsetArrayUseUnallocatedBlock ? | |
403 unallocated_block() : end(); | |
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404 if (CMSTraceSweeper) { |
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405 gclog_or_tty->print_cr(">>>>> Saving sweep limit " PTR_FORMAT |
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406 " for space [" PTR_FORMAT "," PTR_FORMAT ") <<<<<<", |
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407 p2i(_sweep_limit), p2i(bottom()), p2i(end())); |
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408 } |
0 | 409 } |
410 NOT_PRODUCT( | |
411 void clear_sweep_limit() { _sweep_limit = NULL; } | |
412 ) | |
413 HeapWord* sweep_limit() { return _sweep_limit; } | |
414 | |
415 // Apply "blk->do_oop" to the addresses of all reference fields in objects | |
416 // promoted into this generation since the most recent save_marks() call. | |
417 // Fields in objects allocated by applications of the closure | |
418 // *are* included in the iteration. Thus, when the iteration completes | |
419 // there should be no further such objects remaining. | |
420 #define CFLS_OOP_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \ | |
421 void oop_since_save_marks_iterate##nv_suffix(OopClosureType* blk); | |
422 ALL_SINCE_SAVE_MARKS_CLOSURES(CFLS_OOP_SINCE_SAVE_MARKS_DECL) | |
423 #undef CFLS_OOP_SINCE_SAVE_MARKS_DECL | |
424 | |
425 // Allocation support | |
426 HeapWord* allocate(size_t size); | |
427 HeapWord* par_allocate(size_t size); | |
428 | |
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429 oop promote(oop obj, size_t obj_size); |
0 | 430 void gc_prologue(); |
431 void gc_epilogue(); | |
432 | |
433 // This call is used by a containing CMS generation / collector | |
434 // to inform the CFLS space that a sweep has been completed | |
435 // and that the space can do any related house-keeping functions. | |
436 void sweep_completed(); | |
437 | |
438 // For an object in this space, the mark-word's two | |
439 // LSB's having the value [11] indicates that it has been | |
440 // promoted since the most recent call to save_marks() on | |
441 // this generation and has not subsequently been iterated | |
442 // over (using oop_since_save_marks_iterate() above). | |
1521 | 443 // This property holds only for single-threaded collections, |
444 // and is typically used for Cheney scans; for MT scavenges, | |
445 // the property holds for all objects promoted during that | |
446 // scavenge for the duration of the scavenge and is used | |
447 // by card-scanning to avoid scanning objects (being) promoted | |
448 // during that scavenge. | |
0 | 449 bool obj_allocated_since_save_marks(const oop obj) const { |
450 assert(is_in_reserved(obj), "Wrong space?"); | |
451 return ((PromotedObject*)obj)->hasPromotedMark(); | |
452 } | |
453 | |
454 // A worst-case estimate of the space required (in HeapWords) to expand the | |
455 // heap when promoting an obj of size obj_size. | |
456 size_t expansionSpaceRequired(size_t obj_size) const; | |
457 | |
458 FreeChunk* allocateScratch(size_t size); | |
459 | |
460 // returns true if either the small or large linear allocation buffer is empty. | |
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461 bool linearAllocationWouldFail() const; |
0 | 462 |
463 // Adjust the chunk for the minimum size. This version is called in | |
464 // most cases in CompactibleFreeListSpace methods. | |
465 inline static size_t adjustObjectSize(size_t size) { | |
466 return (size_t) align_object_size(MAX2(size, (size_t)MinChunkSize)); | |
467 } | |
468 // This is a virtual version of adjustObjectSize() that is called | |
469 // only occasionally when the compaction space changes and the type | |
470 // of the new compaction space is is only known to be CompactibleSpace. | |
471 size_t adjust_object_size_v(size_t size) const { | |
472 return adjustObjectSize(size); | |
473 } | |
474 // Minimum size of a free block. | |
475 virtual size_t minimum_free_block_size() const { return MinChunkSize; } | |
476 void removeFreeChunkFromFreeLists(FreeChunk* chunk); | |
477 void addChunkAndRepairOffsetTable(HeapWord* chunk, size_t size, | |
478 bool coalesced); | |
479 | |
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480 // Support for decisions regarding concurrent collection policy |
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481 bool should_concurrent_collect() const; |
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482 |
0 | 483 // Support for compaction |
484 void prepare_for_compaction(CompactPoint* cp); | |
485 void adjust_pointers(); | |
486 void compact(); | |
487 // reset the space to reflect the fact that a compaction of the | |
488 // space has been done. | |
489 virtual void reset_after_compaction(); | |
490 | |
491 // Debugging support | |
492 void print() const; | |
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493 void print_on(outputStream* st) const; |
0 | 494 void prepare_for_verify(); |
6008 | 495 void verify() const; |
0 | 496 void verifyFreeLists() const PRODUCT_RETURN; |
497 void verifyIndexedFreeLists() const; | |
498 void verifyIndexedFreeList(size_t size) const; | |
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499 // Verify that the given chunk is in the free lists: |
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500 // i.e. either the binary tree dictionary, the indexed free lists |
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501 // or the linear allocation block. |
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502 bool verify_chunk_in_free_list(FreeChunk* fc) const; |
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503 // Verify that the given chunk is the linear allocation block |
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504 bool verify_chunk_is_linear_alloc_block(FreeChunk* fc) const; |
0 | 505 // Do some basic checks on the the free lists. |
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506 void check_free_list_consistency() const PRODUCT_RETURN; |
0 | 507 |
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508 // Printing support |
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509 void dump_at_safepoint_with_locks(CMSCollector* c, outputStream* st); |
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510 void print_indexed_free_lists(outputStream* st) const; |
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511 void print_dictionary_free_lists(outputStream* st) const; |
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512 void print_promo_info_blocks(outputStream* st) const; |
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513 |
0 | 514 NOT_PRODUCT ( |
515 void initializeIndexedFreeListArrayReturnedBytes(); | |
516 size_t sumIndexedFreeListArrayReturnedBytes(); | |
517 // Return the total number of chunks in the indexed free lists. | |
518 size_t totalCountInIndexedFreeLists() const; | |
519 // Return the total numberof chunks in the space. | |
520 size_t totalCount(); | |
521 ) | |
522 | |
523 // The census consists of counts of the quantities such as | |
524 // the current count of the free chunks, number of chunks | |
525 // created as a result of the split of a larger chunk or | |
526 // coalescing of smaller chucks, etc. The counts in the | |
527 // census is used to make decisions on splitting and | |
528 // coalescing of chunks during the sweep of garbage. | |
529 | |
530 // Print the statistics for the free lists. | |
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531 void printFLCensus(size_t sweep_count) const; |
0 | 532 |
533 // Statistics functions | |
534 // Initialize census for lists before the sweep. | |
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535 void beginSweepFLCensus(float inter_sweep_current, |
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536 float inter_sweep_estimate, |
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537 float intra_sweep_estimate); |
0 | 538 // Set the surplus for each of the free lists. |
539 void setFLSurplus(); | |
540 // Set the hint for each of the free lists. | |
541 void setFLHints(); | |
542 // Clear the census for each of the free lists. | |
543 void clearFLCensus(); | |
544 // Perform functions for the census after the end of the sweep. | |
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545 void endSweepFLCensus(size_t sweep_count); |
0 | 546 // Return true if the count of free chunks is greater |
547 // than the desired number of free chunks. | |
548 bool coalOverPopulated(size_t size); | |
549 | |
550 // Record (for each size): | |
551 // | |
552 // split-births = #chunks added due to splits in (prev-sweep-end, | |
553 // this-sweep-start) | |
554 // split-deaths = #chunks removed for splits in (prev-sweep-end, | |
555 // this-sweep-start) | |
556 // num-curr = #chunks at start of this sweep | |
557 // num-prev = #chunks at end of previous sweep | |
558 // | |
559 // The above are quantities that are measured. Now define: | |
560 // | |
561 // num-desired := num-prev + split-births - split-deaths - num-curr | |
562 // | |
563 // Roughly, num-prev + split-births is the supply, | |
564 // split-deaths is demand due to other sizes | |
565 // and num-curr is what we have left. | |
566 // | |
567 // Thus, num-desired is roughly speaking the "legitimate demand" | |
568 // for blocks of this size and what we are striving to reach at the | |
569 // end of the current sweep. | |
570 // | |
571 // For a given list, let num-len be its current population. | |
572 // Define, for a free list of a given size: | |
573 // | |
574 // coal-overpopulated := num-len >= num-desired * coal-surplus | |
575 // (coal-surplus is set to 1.05, i.e. we allow a little slop when | |
576 // coalescing -- we do not coalesce unless we think that the current | |
577 // supply has exceeded the estimated demand by more than 5%). | |
578 // | |
579 // For the set of sizes in the binary tree, which is neither dense nor | |
580 // closed, it may be the case that for a particular size we have never | |
581 // had, or do not now have, or did not have at the previous sweep, | |
582 // chunks of that size. We need to extend the definition of | |
583 // coal-overpopulated to such sizes as well: | |
584 // | |
585 // For a chunk in/not in the binary tree, extend coal-overpopulated | |
586 // defined above to include all sizes as follows: | |
587 // | |
588 // . a size that is non-existent is coal-overpopulated | |
589 // . a size that has a num-desired <= 0 as defined above is | |
590 // coal-overpopulated. | |
591 // | |
592 // Also define, for a chunk heap-offset C and mountain heap-offset M: | |
593 // | |
594 // close-to-mountain := C >= 0.99 * M | |
595 // | |
596 // Now, the coalescing strategy is: | |
597 // | |
598 // Coalesce left-hand chunk with right-hand chunk if and | |
599 // only if: | |
600 // | |
601 // EITHER | |
602 // . left-hand chunk is of a size that is coal-overpopulated | |
603 // OR | |
604 // . right-hand chunk is close-to-mountain | |
605 void smallCoalBirth(size_t size); | |
606 void smallCoalDeath(size_t size); | |
607 void coalBirth(size_t size); | |
608 void coalDeath(size_t size); | |
609 void smallSplitBirth(size_t size); | |
610 void smallSplitDeath(size_t size); | |
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611 void split_birth(size_t size); |
0 | 612 void splitDeath(size_t size); |
613 void split(size_t from, size_t to1); | |
614 | |
615 double flsFrag() const; | |
616 }; | |
617 | |
618 // A parallel-GC-thread-local allocation buffer for allocation into a | |
619 // CompactibleFreeListSpace. | |
6197 | 620 class CFLS_LAB : public CHeapObj<mtGC> { |
0 | 621 // The space that this buffer allocates into. |
622 CompactibleFreeListSpace* _cfls; | |
623 | |
624 // Our local free lists. | |
6885 | 625 AdaptiveFreeList<FreeChunk> _indexedFreeList[CompactibleFreeListSpace::IndexSetSize]; |
0 | 626 |
627 // Initialized from a command-line arg. | |
628 | |
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629 // Allocation statistics in support of dynamic adjustment of |
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630 // #blocks to claim per get_from_global_pool() call below. |
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631 static AdaptiveWeightedAverage |
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632 _blocks_to_claim [CompactibleFreeListSpace::IndexSetSize]; |
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633 static size_t _global_num_blocks [CompactibleFreeListSpace::IndexSetSize]; |
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634 static uint _global_num_workers[CompactibleFreeListSpace::IndexSetSize]; |
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635 size_t _num_blocks [CompactibleFreeListSpace::IndexSetSize]; |
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636 |
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637 // Internal work method |
6885 | 638 void get_from_global_pool(size_t word_sz, AdaptiveFreeList<FreeChunk>* fl); |
0 | 639 |
640 public: | |
641 CFLS_LAB(CompactibleFreeListSpace* cfls); | |
642 | |
643 // Allocate and return a block of the given size, or else return NULL. | |
644 HeapWord* alloc(size_t word_sz); | |
645 | |
646 // Return any unused portions of the buffer to the global pool. | |
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647 void retire(int tid); |
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648 |
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649 // Dynamic OldPLABSize sizing |
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650 static void compute_desired_plab_size(); |
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651 // When the settings are modified from default static initialization |
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652 static void modify_initialization(size_t n, unsigned wt); |
0 | 653 }; |
654 | |
655 size_t PromotionInfo::refillSize() const { | |
656 const size_t CMSSpoolBlockSize = 256; | |
657 const size_t sz = heap_word_size(sizeof(SpoolBlock) + sizeof(markOop) | |
658 * CMSSpoolBlockSize); | |
659 return CompactibleFreeListSpace::adjustObjectSize(sz); | |
660 } | |
1972 | 661 |
662 #endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_COMPACTIBLEFREELISTSPACE_HPP |