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annotate src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp @ 8679:a252e688abcf
7189971: Implement CMSWaitDuration for non-incremental mode of CMS
Reviewed-by: jmasa, johnc, ysr
Contributed-by: michal@frajt.eu
author | jmasa |
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date | Fri, 01 Feb 2013 17:02:36 -0800 |
parents | f64ffbf81af5 |
children | 8617e38bb4cb |
rev | line source |
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0 | 1 /* |
8035 | 2 * Copyright (c) 2001, 2013, 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_CONCURRENTMARKSWEEPGENERATION_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CONCURRENTMARKSWEEPGENERATION_HPP | |
27 | |
28 #include "gc_implementation/shared/gSpaceCounters.hpp" | |
29 #include "gc_implementation/shared/gcStats.hpp" | |
30 #include "gc_implementation/shared/generationCounters.hpp" | |
6026 | 31 #include "memory/freeBlockDictionary.hpp" |
1972 | 32 #include "memory/generation.hpp" |
33 #include "runtime/mutexLocker.hpp" | |
34 #include "runtime/virtualspace.hpp" | |
35 #include "services/memoryService.hpp" | |
36 #include "utilities/bitMap.inline.hpp" | |
37 #include "utilities/stack.inline.hpp" | |
38 #include "utilities/taskqueue.hpp" | |
39 #include "utilities/yieldingWorkgroup.hpp" | |
40 | |
0 | 41 // ConcurrentMarkSweepGeneration is in support of a concurrent |
42 // mark-sweep old generation in the Detlefs-Printezis--Boehm-Demers-Schenker | |
43 // style. We assume, for now, that this generation is always the | |
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44 // seniormost generation and for simplicity |
0 | 45 // in the first implementation, that this generation is a single compactible |
46 // space. Neither of these restrictions appears essential, and will be | |
47 // relaxed in the future when more time is available to implement the | |
48 // greater generality (and there's a need for it). | |
49 // | |
50 // Concurrent mode failures are currently handled by | |
51 // means of a sliding mark-compact. | |
52 | |
53 class CMSAdaptiveSizePolicy; | |
54 class CMSConcMarkingTask; | |
55 class CMSGCAdaptivePolicyCounters; | |
56 class ConcurrentMarkSweepGeneration; | |
57 class ConcurrentMarkSweepPolicy; | |
58 class ConcurrentMarkSweepThread; | |
59 class CompactibleFreeListSpace; | |
60 class FreeChunk; | |
61 class PromotionInfo; | |
62 class ScanMarkedObjectsAgainCarefullyClosure; | |
63 | |
64 // A generic CMS bit map. It's the basis for both the CMS marking bit map | |
65 // as well as for the mod union table (in each case only a subset of the | |
66 // methods are used). This is essentially a wrapper around the BitMap class, | |
67 // with one bit per (1<<_shifter) HeapWords. (i.e. for the marking bit map, | |
68 // we have _shifter == 0. and for the mod union table we have | |
69 // shifter == CardTableModRefBS::card_shift - LogHeapWordSize.) | |
70 // XXX 64-bit issues in BitMap? | |
71 class CMSBitMap VALUE_OBJ_CLASS_SPEC { | |
72 friend class VMStructs; | |
73 | |
74 HeapWord* _bmStartWord; // base address of range covered by map | |
75 size_t _bmWordSize; // map size (in #HeapWords covered) | |
76 const int _shifter; // shifts to convert HeapWord to bit position | |
77 VirtualSpace _virtual_space; // underlying the bit map | |
78 BitMap _bm; // the bit map itself | |
79 public: | |
80 Mutex* const _lock; // mutex protecting _bm; | |
81 | |
82 public: | |
83 // constructor | |
84 CMSBitMap(int shifter, int mutex_rank, const char* mutex_name); | |
85 | |
86 // allocates the actual storage for the map | |
87 bool allocate(MemRegion mr); | |
88 // field getter | |
89 Mutex* lock() const { return _lock; } | |
90 // locking verifier convenience function | |
91 void assert_locked() const PRODUCT_RETURN; | |
92 | |
93 // inquiries | |
94 HeapWord* startWord() const { return _bmStartWord; } | |
95 size_t sizeInWords() const { return _bmWordSize; } | |
96 size_t sizeInBits() const { return _bm.size(); } | |
97 // the following is one past the last word in space | |
98 HeapWord* endWord() const { return _bmStartWord + _bmWordSize; } | |
99 | |
100 // reading marks | |
101 bool isMarked(HeapWord* addr) const; | |
102 bool par_isMarked(HeapWord* addr) const; // do not lock checks | |
103 bool isUnmarked(HeapWord* addr) const; | |
104 bool isAllClear() const; | |
105 | |
106 // writing marks | |
107 void mark(HeapWord* addr); | |
108 // For marking by parallel GC threads; | |
109 // returns true if we did, false if another thread did | |
110 bool par_mark(HeapWord* addr); | |
111 | |
112 void mark_range(MemRegion mr); | |
113 void par_mark_range(MemRegion mr); | |
114 void mark_large_range(MemRegion mr); | |
115 void par_mark_large_range(MemRegion mr); | |
116 void par_clear(HeapWord* addr); // For unmarking by parallel GC threads. | |
117 void clear_range(MemRegion mr); | |
118 void par_clear_range(MemRegion mr); | |
119 void clear_large_range(MemRegion mr); | |
120 void par_clear_large_range(MemRegion mr); | |
121 void clear_all(); | |
122 void clear_all_incrementally(); // Not yet implemented!! | |
123 | |
124 NOT_PRODUCT( | |
125 // checks the memory region for validity | |
126 void region_invariant(MemRegion mr); | |
127 ) | |
128 | |
129 // iteration | |
130 void iterate(BitMapClosure* cl) { | |
131 _bm.iterate(cl); | |
132 } | |
133 void iterate(BitMapClosure* cl, HeapWord* left, HeapWord* right); | |
134 void dirty_range_iterate_clear(MemRegionClosure* cl); | |
135 void dirty_range_iterate_clear(MemRegion mr, MemRegionClosure* cl); | |
136 | |
137 // auxiliary support for iteration | |
138 HeapWord* getNextMarkedWordAddress(HeapWord* addr) const; | |
139 HeapWord* getNextMarkedWordAddress(HeapWord* start_addr, | |
140 HeapWord* end_addr) const; | |
141 HeapWord* getNextUnmarkedWordAddress(HeapWord* addr) const; | |
142 HeapWord* getNextUnmarkedWordAddress(HeapWord* start_addr, | |
143 HeapWord* end_addr) const; | |
144 MemRegion getAndClearMarkedRegion(HeapWord* addr); | |
145 MemRegion getAndClearMarkedRegion(HeapWord* start_addr, | |
146 HeapWord* end_addr); | |
147 | |
148 // conversion utilities | |
149 HeapWord* offsetToHeapWord(size_t offset) const; | |
150 size_t heapWordToOffset(HeapWord* addr) const; | |
151 size_t heapWordDiffToOffsetDiff(size_t diff) const; | |
152 | |
153 // debugging | |
154 // is this address range covered by the bit-map? | |
155 NOT_PRODUCT( | |
156 bool covers(MemRegion mr) const; | |
157 bool covers(HeapWord* start, size_t size = 0) const; | |
158 ) | |
159 void verifyNoOneBitsInRange(HeapWord* left, HeapWord* right) PRODUCT_RETURN; | |
160 }; | |
161 | |
162 // Represents a marking stack used by the CMS collector. | |
163 // Ideally this should be GrowableArray<> just like MSC's marking stack(s). | |
6197 | 164 class CMSMarkStack: public CHeapObj<mtGC> { |
0 | 165 // |
166 friend class CMSCollector; // to get at expasion stats further below | |
167 // | |
168 | |
169 VirtualSpace _virtual_space; // space for the stack | |
170 oop* _base; // bottom of stack | |
171 size_t _index; // one more than last occupied index | |
172 size_t _capacity; // max #elements | |
173 Mutex _par_lock; // an advisory lock used in case of parallel access | |
174 NOT_PRODUCT(size_t _max_depth;) // max depth plumbed during run | |
175 | |
176 protected: | |
177 size_t _hit_limit; // we hit max stack size limit | |
178 size_t _failed_double; // we failed expansion before hitting limit | |
179 | |
180 public: | |
181 CMSMarkStack(): | |
182 _par_lock(Mutex::event, "CMSMarkStack._par_lock", true), | |
183 _hit_limit(0), | |
184 _failed_double(0) {} | |
185 | |
186 bool allocate(size_t size); | |
187 | |
188 size_t capacity() const { return _capacity; } | |
189 | |
190 oop pop() { | |
191 if (!isEmpty()) { | |
192 return _base[--_index] ; | |
193 } | |
194 return NULL; | |
195 } | |
196 | |
197 bool push(oop ptr) { | |
198 if (isFull()) { | |
199 return false; | |
200 } else { | |
201 _base[_index++] = ptr; | |
202 NOT_PRODUCT(_max_depth = MAX2(_max_depth, _index)); | |
203 return true; | |
204 } | |
205 } | |
206 | |
207 bool isEmpty() const { return _index == 0; } | |
208 bool isFull() const { | |
209 assert(_index <= _capacity, "buffer overflow"); | |
210 return _index == _capacity; | |
211 } | |
212 | |
213 size_t length() { return _index; } | |
214 | |
215 // "Parallel versions" of some of the above | |
216 oop par_pop() { | |
217 // lock and pop | |
218 MutexLockerEx x(&_par_lock, Mutex::_no_safepoint_check_flag); | |
219 return pop(); | |
220 } | |
221 | |
222 bool par_push(oop ptr) { | |
223 // lock and push | |
224 MutexLockerEx x(&_par_lock, Mutex::_no_safepoint_check_flag); | |
225 return push(ptr); | |
226 } | |
227 | |
228 // Forcibly reset the stack, losing all of its contents. | |
229 void reset() { | |
230 _index = 0; | |
231 } | |
232 | |
233 // Expand the stack, typically in response to an overflow condition | |
234 void expand(); | |
235 | |
236 // Compute the least valued stack element. | |
237 oop least_value(HeapWord* low) { | |
238 oop least = (oop)low; | |
239 for (size_t i = 0; i < _index; i++) { | |
240 least = MIN2(least, _base[i]); | |
241 } | |
242 return least; | |
243 } | |
244 | |
245 // Exposed here to allow stack expansion in || case | |
246 Mutex* par_lock() { return &_par_lock; } | |
247 }; | |
248 | |
249 class CardTableRS; | |
250 class CMSParGCThreadState; | |
251 | |
252 class ModUnionClosure: public MemRegionClosure { | |
253 protected: | |
254 CMSBitMap* _t; | |
255 public: | |
256 ModUnionClosure(CMSBitMap* t): _t(t) { } | |
257 void do_MemRegion(MemRegion mr); | |
258 }; | |
259 | |
260 class ModUnionClosurePar: public ModUnionClosure { | |
261 public: | |
262 ModUnionClosurePar(CMSBitMap* t): ModUnionClosure(t) { } | |
263 void do_MemRegion(MemRegion mr); | |
264 }; | |
265 | |
266 // Survivor Chunk Array in support of parallelization of | |
267 // Survivor Space rescan. | |
6197 | 268 class ChunkArray: public CHeapObj<mtGC> { |
0 | 269 size_t _index; |
270 size_t _capacity; | |
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271 size_t _overflows; |
0 | 272 HeapWord** _array; // storage for array |
273 | |
274 public: | |
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275 ChunkArray() : _index(0), _capacity(0), _overflows(0), _array(NULL) {} |
0 | 276 ChunkArray(HeapWord** a, size_t c): |
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277 _index(0), _capacity(c), _overflows(0), _array(a) {} |
0 | 278 |
279 HeapWord** array() { return _array; } | |
280 void set_array(HeapWord** a) { _array = a; } | |
281 | |
282 size_t capacity() { return _capacity; } | |
283 void set_capacity(size_t c) { _capacity = c; } | |
284 | |
285 size_t end() { | |
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286 assert(_index <= capacity(), |
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287 err_msg("_index (" SIZE_FORMAT ") > _capacity (" SIZE_FORMAT "): out of bounds", |
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288 _index, _capacity)); |
0 | 289 return _index; |
290 } // exclusive | |
291 | |
292 HeapWord* nth(size_t n) { | |
293 assert(n < end(), "Out of bounds access"); | |
294 return _array[n]; | |
295 } | |
296 | |
297 void reset() { | |
298 _index = 0; | |
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299 if (_overflows > 0 && PrintCMSStatistics > 1) { |
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300 warning("CMS: ChunkArray[" SIZE_FORMAT "] overflowed " SIZE_FORMAT " times", |
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301 _capacity, _overflows); |
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302 } |
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303 _overflows = 0; |
0 | 304 } |
305 | |
306 void record_sample(HeapWord* p, size_t sz) { | |
307 // For now we do not do anything with the size | |
308 if (_index < _capacity) { | |
309 _array[_index++] = p; | |
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310 } else { |
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311 ++_overflows; |
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312 assert(_index == _capacity, |
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313 err_msg("_index (" SIZE_FORMAT ") > _capacity (" SIZE_FORMAT |
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314 "): out of bounds at overflow#" SIZE_FORMAT, |
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315 _index, _capacity, _overflows)); |
0 | 316 } |
317 } | |
318 }; | |
319 | |
320 // | |
321 // Timing, allocation and promotion statistics for gc scheduling and incremental | |
322 // mode pacing. Most statistics are exponential averages. | |
323 // | |
324 class CMSStats VALUE_OBJ_CLASS_SPEC { | |
325 private: | |
326 ConcurrentMarkSweepGeneration* const _cms_gen; // The cms (old) gen. | |
327 | |
328 // The following are exponential averages with factor alpha: | |
329 // avg = (100 - alpha) * avg + alpha * cur_sample | |
330 // | |
331 // The durations measure: end_time[n] - start_time[n] | |
332 // The periods measure: start_time[n] - start_time[n-1] | |
333 // | |
334 // The cms period and duration include only concurrent collections; time spent | |
335 // in foreground cms collections due to System.gc() or because of a failure to | |
336 // keep up are not included. | |
337 // | |
338 // There are 3 alphas to "bootstrap" the statistics. The _saved_alpha is the | |
339 // real value, but is used only after the first period. A value of 100 is | |
340 // used for the first sample so it gets the entire weight. | |
341 unsigned int _saved_alpha; // 0-100 | |
342 unsigned int _gc0_alpha; | |
343 unsigned int _cms_alpha; | |
344 | |
345 double _gc0_duration; | |
346 double _gc0_period; | |
347 size_t _gc0_promoted; // bytes promoted per gc0 | |
348 double _cms_duration; | |
349 double _cms_duration_pre_sweep; // time from initiation to start of sweep | |
350 double _cms_duration_per_mb; | |
351 double _cms_period; | |
352 size_t _cms_allocated; // bytes of direct allocation per gc0 period | |
353 | |
354 // Timers. | |
355 elapsedTimer _cms_timer; | |
356 TimeStamp _gc0_begin_time; | |
357 TimeStamp _cms_begin_time; | |
358 TimeStamp _cms_end_time; | |
359 | |
360 // Snapshots of the amount used in the CMS generation. | |
361 size_t _cms_used_at_gc0_begin; | |
362 size_t _cms_used_at_gc0_end; | |
363 size_t _cms_used_at_cms_begin; | |
364 | |
365 // Used to prevent the duty cycle from being reduced in the middle of a cms | |
366 // cycle. | |
367 bool _allow_duty_cycle_reduction; | |
368 | |
369 enum { | |
370 _GC0_VALID = 0x1, | |
371 _CMS_VALID = 0x2, | |
372 _ALL_VALID = _GC0_VALID | _CMS_VALID | |
373 }; | |
374 | |
375 unsigned int _valid_bits; | |
376 | |
377 unsigned int _icms_duty_cycle; // icms duty cycle (0-100). | |
378 | |
379 protected: | |
380 | |
381 // Return a duty cycle that avoids wild oscillations, by limiting the amount | |
382 // of change between old_duty_cycle and new_duty_cycle (the latter is treated | |
383 // as a recommended value). | |
384 static unsigned int icms_damped_duty_cycle(unsigned int old_duty_cycle, | |
385 unsigned int new_duty_cycle); | |
386 unsigned int icms_update_duty_cycle_impl(); | |
387 | |
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388 // In support of adjusting of cms trigger ratios based on history |
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389 // of concurrent mode failure. |
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390 double cms_free_adjustment_factor(size_t free) const; |
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391 void adjust_cms_free_adjustment_factor(bool fail, size_t free); |
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392 |
0 | 393 public: |
394 CMSStats(ConcurrentMarkSweepGeneration* cms_gen, | |
395 unsigned int alpha = CMSExpAvgFactor); | |
396 | |
397 // Whether or not the statistics contain valid data; higher level statistics | |
398 // cannot be called until this returns true (they require at least one young | |
399 // gen and one cms cycle to have completed). | |
400 bool valid() const; | |
401 | |
402 // Record statistics. | |
403 void record_gc0_begin(); | |
404 void record_gc0_end(size_t cms_gen_bytes_used); | |
405 void record_cms_begin(); | |
406 void record_cms_end(); | |
407 | |
408 // Allow management of the cms timer, which must be stopped/started around | |
409 // yield points. | |
410 elapsedTimer& cms_timer() { return _cms_timer; } | |
411 void start_cms_timer() { _cms_timer.start(); } | |
412 void stop_cms_timer() { _cms_timer.stop(); } | |
413 | |
414 // Basic statistics; units are seconds or bytes. | |
415 double gc0_period() const { return _gc0_period; } | |
416 double gc0_duration() const { return _gc0_duration; } | |
417 size_t gc0_promoted() const { return _gc0_promoted; } | |
418 double cms_period() const { return _cms_period; } | |
419 double cms_duration() const { return _cms_duration; } | |
420 double cms_duration_per_mb() const { return _cms_duration_per_mb; } | |
421 size_t cms_allocated() const { return _cms_allocated; } | |
422 | |
423 size_t cms_used_at_gc0_end() const { return _cms_used_at_gc0_end;} | |
424 | |
425 // Seconds since the last background cms cycle began or ended. | |
426 double cms_time_since_begin() const; | |
427 double cms_time_since_end() const; | |
428 | |
429 // Higher level statistics--caller must check that valid() returns true before | |
430 // calling. | |
431 | |
432 // Returns bytes promoted per second of wall clock time. | |
433 double promotion_rate() const; | |
434 | |
435 // Returns bytes directly allocated per second of wall clock time. | |
436 double cms_allocation_rate() const; | |
437 | |
438 // Rate at which space in the cms generation is being consumed (sum of the | |
439 // above two). | |
440 double cms_consumption_rate() const; | |
441 | |
442 // Returns an estimate of the number of seconds until the cms generation will | |
443 // fill up, assuming no collection work is done. | |
444 double time_until_cms_gen_full() const; | |
445 | |
446 // Returns an estimate of the number of seconds remaining until | |
447 // the cms generation collection should start. | |
448 double time_until_cms_start() const; | |
449 | |
450 // End of higher level statistics. | |
451 | |
452 // Returns the cms incremental mode duty cycle, as a percentage (0-100). | |
453 unsigned int icms_duty_cycle() const { return _icms_duty_cycle; } | |
454 | |
455 // Update the duty cycle and return the new value. | |
456 unsigned int icms_update_duty_cycle(); | |
457 | |
458 // Debugging. | |
459 void print_on(outputStream* st) const PRODUCT_RETURN; | |
460 void print() const { print_on(gclog_or_tty); } | |
461 }; | |
462 | |
463 // A closure related to weak references processing which | |
464 // we embed in the CMSCollector, since we need to pass | |
465 // it to the reference processor for secondary filtering | |
466 // of references based on reachability of referent; | |
467 // see role of _is_alive_non_header closure in the | |
468 // ReferenceProcessor class. | |
469 // For objects in the CMS generation, this closure checks | |
470 // if the object is "live" (reachable). Used in weak | |
471 // reference processing. | |
472 class CMSIsAliveClosure: public BoolObjectClosure { | |
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473 const MemRegion _span; |
0 | 474 const CMSBitMap* _bit_map; |
475 | |
476 friend class CMSCollector; | |
477 public: | |
478 CMSIsAliveClosure(MemRegion span, | |
479 CMSBitMap* bit_map): | |
480 _span(span), | |
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481 _bit_map(bit_map) { |
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482 assert(!span.is_empty(), "Empty span could spell trouble"); |
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483 } |
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484 |
0 | 485 void do_object(oop obj) { |
486 assert(false, "not to be invoked"); | |
487 } | |
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488 |
0 | 489 bool do_object_b(oop obj); |
490 }; | |
491 | |
492 | |
493 // Implements AbstractRefProcTaskExecutor for CMS. | |
494 class CMSRefProcTaskExecutor: public AbstractRefProcTaskExecutor { | |
495 public: | |
496 | |
497 CMSRefProcTaskExecutor(CMSCollector& collector) | |
498 : _collector(collector) | |
499 { } | |
500 | |
501 // Executes a task using worker threads. | |
502 virtual void execute(ProcessTask& task); | |
503 virtual void execute(EnqueueTask& task); | |
504 private: | |
505 CMSCollector& _collector; | |
506 }; | |
507 | |
508 | |
6197 | 509 class CMSCollector: public CHeapObj<mtGC> { |
0 | 510 friend class VMStructs; |
511 friend class ConcurrentMarkSweepThread; | |
512 friend class ConcurrentMarkSweepGeneration; | |
513 friend class CompactibleFreeListSpace; | |
514 friend class CMSParRemarkTask; | |
515 friend class CMSConcMarkingTask; | |
516 friend class CMSRefProcTaskProxy; | |
517 friend class CMSRefProcTaskExecutor; | |
518 friend class ScanMarkedObjectsAgainCarefullyClosure; // for sampling eden | |
519 friend class SurvivorSpacePrecleanClosure; // --- ditto ------- | |
520 friend class PushOrMarkClosure; // to access _restart_addr | |
521 friend class Par_PushOrMarkClosure; // to access _restart_addr | |
522 friend class MarkFromRootsClosure; // -- ditto -- | |
523 // ... and for clearing cards | |
524 friend class Par_MarkFromRootsClosure; // to access _restart_addr | |
525 // ... and for clearing cards | |
526 friend class Par_ConcMarkingClosure; // to access _restart_addr etc. | |
527 friend class MarkFromRootsVerifyClosure; // to access _restart_addr | |
528 friend class PushAndMarkVerifyClosure; // -- ditto -- | |
529 friend class MarkRefsIntoAndScanClosure; // to access _overflow_list | |
530 friend class PushAndMarkClosure; // -- ditto -- | |
531 friend class Par_PushAndMarkClosure; // -- ditto -- | |
532 friend class CMSKeepAliveClosure; // -- ditto -- | |
533 friend class CMSDrainMarkingStackClosure; // -- ditto -- | |
534 friend class CMSInnerParMarkAndPushClosure; // -- ditto -- | |
535 NOT_PRODUCT(friend class ScanMarkedObjectsAgainClosure;) // assertion on _overflow_list | |
536 friend class ReleaseForegroundGC; // to access _foregroundGCShouldWait | |
537 friend class VM_CMS_Operation; | |
538 friend class VM_CMS_Initial_Mark; | |
539 friend class VM_CMS_Final_Remark; | |
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540 friend class TraceCMSMemoryManagerStats; |
0 | 541 |
542 private: | |
543 jlong _time_of_last_gc; | |
544 void update_time_of_last_gc(jlong now) { | |
545 _time_of_last_gc = now; | |
546 } | |
547 | |
548 OopTaskQueueSet* _task_queues; | |
549 | |
550 // Overflow list of grey objects, threaded through mark-word | |
551 // Manipulated with CAS in the parallel/multi-threaded case. | |
552 oop _overflow_list; | |
553 // The following array-pair keeps track of mark words | |
554 // displaced for accomodating overflow list above. | |
555 // This code will likely be revisited under RFE#4922830. | |
6197 | 556 Stack<oop, mtGC> _preserved_oop_stack; |
557 Stack<markOop, mtGC> _preserved_mark_stack; | |
0 | 558 |
559 int* _hash_seed; | |
560 | |
561 // In support of multi-threaded concurrent phases | |
562 YieldingFlexibleWorkGang* _conc_workers; | |
563 | |
564 // Performance Counters | |
565 CollectorCounters* _gc_counters; | |
566 | |
567 // Initialization Errors | |
568 bool _completed_initialization; | |
569 | |
570 // In support of ExplicitGCInvokesConcurrent | |
571 static bool _full_gc_requested; | |
572 unsigned int _collection_count_start; | |
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573 |
0 | 574 // Should we unload classes this concurrent cycle? |
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575 bool _should_unload_classes; |
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576 unsigned int _concurrent_cycles_since_last_unload; |
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577 unsigned int concurrent_cycles_since_last_unload() const { |
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578 return _concurrent_cycles_since_last_unload; |
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579 } |
0 | 580 // Did we (allow) unload classes in the previous concurrent cycle? |
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581 bool unloaded_classes_last_cycle() const { |
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582 return concurrent_cycles_since_last_unload() == 0; |
0 | 583 } |
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584 // Root scanning options for perm gen |
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585 int _roots_scanning_options; |
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586 int roots_scanning_options() const { return _roots_scanning_options; } |
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587 void add_root_scanning_option(int o) { _roots_scanning_options |= o; } |
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588 void remove_root_scanning_option(int o) { _roots_scanning_options &= ~o; } |
0 | 589 |
590 // Verification support | |
591 CMSBitMap _verification_mark_bm; | |
592 void verify_after_remark_work_1(); | |
593 void verify_after_remark_work_2(); | |
594 | |
595 // true if any verification flag is on. | |
596 bool _verifying; | |
597 bool verifying() const { return _verifying; } | |
598 void set_verifying(bool v) { _verifying = v; } | |
599 | |
600 // Collector policy | |
601 ConcurrentMarkSweepPolicy* _collector_policy; | |
602 ConcurrentMarkSweepPolicy* collector_policy() { return _collector_policy; } | |
603 | |
604 // XXX Move these to CMSStats ??? FIX ME !!! | |
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605 elapsedTimer _inter_sweep_timer; // time between sweeps |
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606 elapsedTimer _intra_sweep_timer; // time _in_ sweeps |
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607 // padded decaying average estimates of the above |
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608 AdaptivePaddedAverage _inter_sweep_estimate; |
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609 AdaptivePaddedAverage _intra_sweep_estimate; |
0 | 610 |
611 protected: | |
612 ConcurrentMarkSweepGeneration* _cmsGen; // old gen (CMS) | |
613 MemRegion _span; // span covering above two | |
614 CardTableRS* _ct; // card table | |
615 | |
616 // CMS marking support structures | |
617 CMSBitMap _markBitMap; | |
618 CMSBitMap _modUnionTable; | |
619 CMSMarkStack _markStack; | |
620 | |
621 HeapWord* _restart_addr; // in support of marking stack overflow | |
622 void lower_restart_addr(HeapWord* low); | |
623 | |
624 // Counters in support of marking stack / work queue overflow handling: | |
625 // a non-zero value indicates certain types of overflow events during | |
626 // the current CMS cycle and could lead to stack resizing efforts at | |
627 // an opportune future time. | |
628 size_t _ser_pmc_preclean_ovflw; | |
629 size_t _ser_pmc_remark_ovflw; | |
630 size_t _par_pmc_remark_ovflw; | |
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631 size_t _ser_kac_preclean_ovflw; |
0 | 632 size_t _ser_kac_ovflw; |
633 size_t _par_kac_ovflw; | |
534 | 634 NOT_PRODUCT(ssize_t _num_par_pushes;) |
0 | 635 |
636 // ("Weak") Reference processing support | |
637 ReferenceProcessor* _ref_processor; | |
638 CMSIsAliveClosure _is_alive_closure; | |
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639 // keep this textually after _markBitMap and _span; c'tor dependency |
0 | 640 |
641 ConcurrentMarkSweepThread* _cmsThread; // the thread doing the work | |
642 ModUnionClosure _modUnionClosure; | |
643 ModUnionClosurePar _modUnionClosurePar; | |
644 | |
645 // CMS abstract state machine | |
646 // initial_state: Idling | |
647 // next_state(Idling) = {Marking} | |
648 // next_state(Marking) = {Precleaning, Sweeping} | |
649 // next_state(Precleaning) = {AbortablePreclean, FinalMarking} | |
650 // next_state(AbortablePreclean) = {FinalMarking} | |
651 // next_state(FinalMarking) = {Sweeping} | |
652 // next_state(Sweeping) = {Resizing} | |
653 // next_state(Resizing) = {Resetting} | |
654 // next_state(Resetting) = {Idling} | |
655 // The numeric values below are chosen so that: | |
656 // . _collectorState <= Idling == post-sweep && pre-mark | |
657 // . _collectorState in (Idling, Sweeping) == {initial,final}marking || | |
658 // precleaning || abortablePrecleanb | |
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659 public: |
0 | 660 enum CollectorState { |
661 Resizing = 0, | |
662 Resetting = 1, | |
663 Idling = 2, | |
664 InitialMarking = 3, | |
665 Marking = 4, | |
666 Precleaning = 5, | |
667 AbortablePreclean = 6, | |
668 FinalMarking = 7, | |
669 Sweeping = 8 | |
670 }; | |
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671 protected: |
0 | 672 static CollectorState _collectorState; |
673 | |
674 // State related to prologue/epilogue invocation for my generations | |
675 bool _between_prologue_and_epilogue; | |
676 | |
677 // Signalling/State related to coordination between fore- and backgroud GC | |
678 // Note: When the baton has been passed from background GC to foreground GC, | |
679 // _foregroundGCIsActive is true and _foregroundGCShouldWait is false. | |
680 static bool _foregroundGCIsActive; // true iff foreground collector is active or | |
681 // wants to go active | |
682 static bool _foregroundGCShouldWait; // true iff background GC is active and has not | |
683 // yet passed the baton to the foreground GC | |
684 | |
685 // Support for CMSScheduleRemark (abortable preclean) | |
686 bool _abort_preclean; | |
687 bool _start_sampling; | |
688 | |
689 int _numYields; | |
690 size_t _numDirtyCards; | |
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691 size_t _sweep_count; |
0 | 692 // number of full gc's since the last concurrent gc. |
693 uint _full_gcs_since_conc_gc; | |
694 | |
695 // occupancy used for bootstrapping stats | |
696 double _bootstrap_occupancy; | |
697 | |
698 // timer | |
699 elapsedTimer _timer; | |
700 | |
701 // Timing, allocation and promotion statistics, used for scheduling. | |
702 CMSStats _stats; | |
703 | |
704 // Allocation limits installed in the young gen, used only in | |
705 // CMSIncrementalMode. When an allocation in the young gen would cross one of | |
706 // these limits, the cms generation is notified and the cms thread is started | |
707 // or stopped, respectively. | |
708 HeapWord* _icms_start_limit; | |
709 HeapWord* _icms_stop_limit; | |
710 | |
711 enum CMS_op_type { | |
712 CMS_op_checkpointRootsInitial, | |
713 CMS_op_checkpointRootsFinal | |
714 }; | |
715 | |
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716 void do_CMS_operation(CMS_op_type op, GCCause::Cause gc_cause); |
0 | 717 bool stop_world_and_do(CMS_op_type op); |
718 | |
719 OopTaskQueueSet* task_queues() { return _task_queues; } | |
720 int* hash_seed(int i) { return &_hash_seed[i]; } | |
721 YieldingFlexibleWorkGang* conc_workers() { return _conc_workers; } | |
722 | |
723 // Support for parallelizing Eden rescan in CMS remark phase | |
724 void sample_eden(); // ... sample Eden space top | |
725 | |
726 private: | |
727 // Support for parallelizing young gen rescan in CMS remark phase | |
728 Generation* _young_gen; // the younger gen | |
729 HeapWord** _top_addr; // ... Top of Eden | |
730 HeapWord** _end_addr; // ... End of Eden | |
731 HeapWord** _eden_chunk_array; // ... Eden partitioning array | |
732 size_t _eden_chunk_index; // ... top (exclusive) of array | |
733 size_t _eden_chunk_capacity; // ... max entries in array | |
734 | |
735 // Support for parallelizing survivor space rescan | |
736 HeapWord** _survivor_chunk_array; | |
737 size_t _survivor_chunk_index; | |
738 size_t _survivor_chunk_capacity; | |
739 size_t* _cursor; | |
740 ChunkArray* _survivor_plab_array; | |
741 | |
742 // Support for marking stack overflow handling | |
743 bool take_from_overflow_list(size_t num, CMSMarkStack* to_stack); | |
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744 bool par_take_from_overflow_list(size_t num, |
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745 OopTaskQueue* to_work_q, |
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746 int no_of_gc_threads); |
0 | 747 void push_on_overflow_list(oop p); |
748 void par_push_on_overflow_list(oop p); | |
749 // the following is, obviously, not, in general, "MT-stable" | |
750 bool overflow_list_is_empty() const; | |
751 | |
752 void preserve_mark_if_necessary(oop p); | |
753 void par_preserve_mark_if_necessary(oop p); | |
754 void preserve_mark_work(oop p, markOop m); | |
755 void restore_preserved_marks_if_any(); | |
756 NOT_PRODUCT(bool no_preserved_marks() const;) | |
757 // in support of testing overflow code | |
758 NOT_PRODUCT(int _overflow_counter;) | |
759 NOT_PRODUCT(bool simulate_overflow();) // sequential | |
760 NOT_PRODUCT(bool par_simulate_overflow();) // MT version | |
761 | |
762 // CMS work methods | |
763 void checkpointRootsInitialWork(bool asynch); // initial checkpoint work | |
764 | |
765 // a return value of false indicates failure due to stack overflow | |
766 bool markFromRootsWork(bool asynch); // concurrent marking work | |
767 | |
768 public: // FIX ME!!! only for testing | |
769 bool do_marking_st(bool asynch); // single-threaded marking | |
770 bool do_marking_mt(bool asynch); // multi-threaded marking | |
771 | |
772 private: | |
773 | |
774 // concurrent precleaning work | |
775 size_t preclean_mod_union_table(ConcurrentMarkSweepGeneration* gen, | |
776 ScanMarkedObjectsAgainCarefullyClosure* cl); | |
777 size_t preclean_card_table(ConcurrentMarkSweepGeneration* gen, | |
778 ScanMarkedObjectsAgainCarefullyClosure* cl); | |
779 // Does precleaning work, returning a quantity indicative of | |
780 // the amount of "useful work" done. | |
781 size_t preclean_work(bool clean_refs, bool clean_survivors); | |
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782 void preclean_klasses(MarkRefsIntoAndScanClosure* cl, Mutex* freelistLock); |
0 | 783 void abortable_preclean(); // Preclean while looking for possible abort |
784 void initialize_sequential_subtasks_for_young_gen_rescan(int i); | |
785 // Helper function for above; merge-sorts the per-thread plab samples | |
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786 void merge_survivor_plab_arrays(ContiguousSpace* surv, int no_of_gc_threads); |
0 | 787 // Resets (i.e. clears) the per-thread plab sample vectors |
788 void reset_survivor_plab_arrays(); | |
789 | |
790 // final (second) checkpoint work | |
791 void checkpointRootsFinalWork(bool asynch, bool clear_all_soft_refs, | |
792 bool init_mark_was_synchronous); | |
793 // work routine for parallel version of remark | |
794 void do_remark_parallel(); | |
795 // work routine for non-parallel version of remark | |
796 void do_remark_non_parallel(); | |
797 // reference processing work routine (during second checkpoint) | |
798 void refProcessingWork(bool asynch, bool clear_all_soft_refs); | |
799 | |
800 // concurrent sweeping work | |
801 void sweepWork(ConcurrentMarkSweepGeneration* gen, bool asynch); | |
802 | |
803 // (concurrent) resetting of support data structures | |
804 void reset(bool asynch); | |
805 | |
806 // Clear _expansion_cause fields of constituent generations | |
807 void clear_expansion_cause(); | |
808 | |
809 // An auxilliary method used to record the ends of | |
810 // used regions of each generation to limit the extent of sweep | |
811 void save_sweep_limits(); | |
812 | |
813 // Resize the generations included in the collector. | |
814 void compute_new_size(); | |
815 | |
816 // A work method used by foreground collection to determine | |
817 // what type of collection (compacting or not, continuing or fresh) | |
818 // it should do. | |
819 void decide_foreground_collection_type(bool clear_all_soft_refs, | |
820 bool* should_compact, bool* should_start_over); | |
821 | |
822 // A work method used by the foreground collector to do | |
823 // a mark-sweep-compact. | |
824 void do_compaction_work(bool clear_all_soft_refs); | |
825 | |
826 // A work method used by the foreground collector to do | |
827 // a mark-sweep, after taking over from a possibly on-going | |
828 // concurrent mark-sweep collection. | |
829 void do_mark_sweep_work(bool clear_all_soft_refs, | |
830 CollectorState first_state, bool should_start_over); | |
831 | |
832 // If the backgrould GC is active, acquire control from the background | |
833 // GC and do the collection. | |
834 void acquire_control_and_collect(bool full, bool clear_all_soft_refs); | |
835 | |
836 // For synchronizing passing of control from background to foreground | |
837 // GC. waitForForegroundGC() is called by the background | |
838 // collector. It if had to wait for a foreground collection, | |
839 // it returns true and the background collection should assume | |
840 // that the collection was finished by the foreground | |
841 // collector. | |
842 bool waitForForegroundGC(); | |
843 | |
844 // Incremental mode triggering: recompute the icms duty cycle and set the | |
845 // allocation limits in the young gen. | |
846 void icms_update_allocation_limits(); | |
847 | |
848 size_t block_size_using_printezis_bits(HeapWord* addr) const; | |
849 size_t block_size_if_printezis_bits(HeapWord* addr) const; | |
850 HeapWord* next_card_start_after_block(HeapWord* addr) const; | |
851 | |
852 void setup_cms_unloading_and_verification_state(); | |
853 public: | |
854 CMSCollector(ConcurrentMarkSweepGeneration* cmsGen, | |
855 CardTableRS* ct, | |
856 ConcurrentMarkSweepPolicy* cp); | |
857 ConcurrentMarkSweepThread* cmsThread() { return _cmsThread; } | |
858 | |
859 ReferenceProcessor* ref_processor() { return _ref_processor; } | |
860 void ref_processor_init(); | |
861 | |
862 Mutex* bitMapLock() const { return _markBitMap.lock(); } | |
863 static CollectorState abstract_state() { return _collectorState; } | |
864 | |
865 bool should_abort_preclean() const; // Whether preclean should be aborted. | |
866 size_t get_eden_used() const; | |
867 size_t get_eden_capacity() const; | |
868 | |
869 ConcurrentMarkSweepGeneration* cmsGen() { return _cmsGen; } | |
870 | |
871 // locking checks | |
872 NOT_PRODUCT(static bool have_cms_token();) | |
873 | |
874 // XXXPERM bool should_collect(bool full, size_t size, bool tlab); | |
875 bool shouldConcurrentCollect(); | |
876 | |
877 void collect(bool full, | |
878 bool clear_all_soft_refs, | |
879 size_t size, | |
880 bool tlab); | |
881 void collect_in_background(bool clear_all_soft_refs); | |
882 void collect_in_foreground(bool clear_all_soft_refs); | |
883 | |
884 // In support of ExplicitGCInvokesConcurrent | |
885 static void request_full_gc(unsigned int full_gc_count); | |
886 // Should we unload classes in a particular concurrent cycle? | |
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887 bool should_unload_classes() const { |
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888 return _should_unload_classes; |
0 | 889 } |
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890 void update_should_unload_classes(); |
0 | 891 |
892 void direct_allocated(HeapWord* start, size_t size); | |
893 | |
894 // Object is dead if not marked and current phase is sweeping. | |
895 bool is_dead_obj(oop obj) const; | |
896 | |
897 // After a promotion (of "start"), do any necessary marking. | |
898 // If "par", then it's being done by a parallel GC thread. | |
899 // The last two args indicate if we need precise marking | |
900 // and if so the size of the object so it can be dirtied | |
901 // in its entirety. | |
902 void promoted(bool par, HeapWord* start, | |
903 bool is_obj_array, size_t obj_size); | |
904 | |
905 HeapWord* allocation_limit_reached(Space* space, HeapWord* top, | |
906 size_t word_size); | |
907 | |
908 void getFreelistLocks() const; | |
909 void releaseFreelistLocks() const; | |
910 bool haveFreelistLocks() const; | |
911 | |
912 // GC prologue and epilogue | |
913 void gc_prologue(bool full); | |
914 void gc_epilogue(bool full); | |
915 | |
916 jlong time_of_last_gc(jlong now) { | |
917 if (_collectorState <= Idling) { | |
918 // gc not in progress | |
919 return _time_of_last_gc; | |
920 } else { | |
921 // collection in progress | |
922 return now; | |
923 } | |
924 } | |
925 | |
926 // Support for parallel remark of survivor space | |
927 void* get_data_recorder(int thr_num); | |
928 | |
929 CMSBitMap* markBitMap() { return &_markBitMap; } | |
930 void directAllocated(HeapWord* start, size_t size); | |
931 | |
932 // main CMS steps and related support | |
933 void checkpointRootsInitial(bool asynch); | |
934 bool markFromRoots(bool asynch); // a return value of false indicates failure | |
935 // due to stack overflow | |
936 void preclean(); | |
937 void checkpointRootsFinal(bool asynch, bool clear_all_soft_refs, | |
938 bool init_mark_was_synchronous); | |
939 void sweep(bool asynch); | |
940 | |
941 // Check that the currently executing thread is the expected | |
942 // one (foreground collector or background collector). | |
1145
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943 static void check_correct_thread_executing() PRODUCT_RETURN; |
0 | 944 // XXXPERM void print_statistics() PRODUCT_RETURN; |
945 | |
946 bool is_cms_reachable(HeapWord* addr); | |
947 | |
948 // Performance Counter Support | |
949 CollectorCounters* counters() { return _gc_counters; } | |
950 | |
951 // timer stuff | |
952 void startTimer() { assert(!_timer.is_active(), "Error"); _timer.start(); } | |
953 void stopTimer() { assert( _timer.is_active(), "Error"); _timer.stop(); } | |
954 void resetTimer() { assert(!_timer.is_active(), "Error"); _timer.reset(); } | |
955 double timerValue() { assert(!_timer.is_active(), "Error"); return _timer.seconds(); } | |
956 | |
957 int yields() { return _numYields; } | |
958 void resetYields() { _numYields = 0; } | |
959 void incrementYields() { _numYields++; } | |
960 void resetNumDirtyCards() { _numDirtyCards = 0; } | |
961 void incrementNumDirtyCards(size_t num) { _numDirtyCards += num; } | |
962 size_t numDirtyCards() { return _numDirtyCards; } | |
963 | |
964 static bool foregroundGCShouldWait() { return _foregroundGCShouldWait; } | |
965 static void set_foregroundGCShouldWait(bool v) { _foregroundGCShouldWait = v; } | |
966 static bool foregroundGCIsActive() { return _foregroundGCIsActive; } | |
967 static void set_foregroundGCIsActive(bool v) { _foregroundGCIsActive = v; } | |
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968 size_t sweep_count() const { return _sweep_count; } |
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969 void increment_sweep_count() { _sweep_count++; } |
0 | 970 |
971 // Timers/stats for gc scheduling and incremental mode pacing. | |
972 CMSStats& stats() { return _stats; } | |
973 | |
974 // Convenience methods that check whether CMSIncrementalMode is enabled and | |
975 // forward to the corresponding methods in ConcurrentMarkSweepThread. | |
976 static void start_icms(); | |
977 static void stop_icms(); // Called at the end of the cms cycle. | |
978 static void disable_icms(); // Called before a foreground collection. | |
979 static void enable_icms(); // Called after a foreground collection. | |
980 void icms_wait(); // Called at yield points. | |
981 | |
982 // Adaptive size policy | |
983 CMSAdaptiveSizePolicy* size_policy(); | |
984 CMSGCAdaptivePolicyCounters* gc_adaptive_policy_counters(); | |
985 | |
986 // debugging | |
6008 | 987 void verify(); |
0 | 988 bool verify_after_remark(); |
989 void verify_ok_to_terminate() const PRODUCT_RETURN; | |
990 void verify_work_stacks_empty() const PRODUCT_RETURN; | |
991 void verify_overflow_empty() const PRODUCT_RETURN; | |
992 | |
993 // convenience methods in support of debugging | |
994 static const size_t skip_header_HeapWords() PRODUCT_RETURN0; | |
995 HeapWord* block_start(const void* p) const PRODUCT_RETURN0; | |
996 | |
997 // accessors | |
998 CMSMarkStack* verification_mark_stack() { return &_markStack; } | |
999 CMSBitMap* verification_mark_bm() { return &_verification_mark_bm; } | |
1000 | |
1001 // Initialization errors | |
1002 bool completed_initialization() { return _completed_initialization; } | |
1003 }; | |
1004 | |
1005 class CMSExpansionCause : public AllStatic { | |
1006 public: | |
1007 enum Cause { | |
1008 _no_expansion, | |
1009 _satisfy_free_ratio, | |
1010 _satisfy_promotion, | |
1011 _satisfy_allocation, | |
1012 _allocate_par_lab, | |
1013 _allocate_par_spooling_space, | |
1014 _adaptive_size_policy | |
1015 }; | |
1016 // Return a string describing the cause of the expansion. | |
1017 static const char* to_string(CMSExpansionCause::Cause cause); | |
1018 }; | |
1019 | |
1020 class ConcurrentMarkSweepGeneration: public CardGeneration { | |
1021 friend class VMStructs; | |
1022 friend class ConcurrentMarkSweepThread; | |
1023 friend class ConcurrentMarkSweep; | |
1024 friend class CMSCollector; | |
1025 protected: | |
1026 static CMSCollector* _collector; // the collector that collects us | |
1027 CompactibleFreeListSpace* _cmsSpace; // underlying space (only one for now) | |
1028 | |
1029 // Performance Counters | |
1030 GenerationCounters* _gen_counters; | |
1031 GSpaceCounters* _space_counters; | |
1032 | |
1033 // Words directly allocated, used by CMSStats. | |
1034 size_t _direct_allocated_words; | |
1035 | |
1036 // Non-product stat counters | |
1037 NOT_PRODUCT( | |
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1038 size_t _numObjectsPromoted; |
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1039 size_t _numWordsPromoted; |
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1040 size_t _numObjectsAllocated; |
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1041 size_t _numWordsAllocated; |
0 | 1042 ) |
1043 | |
1044 // Used for sizing decisions | |
1045 bool _incremental_collection_failed; | |
1046 bool incremental_collection_failed() { | |
1047 return _incremental_collection_failed; | |
1048 } | |
1049 void set_incremental_collection_failed() { | |
1050 _incremental_collection_failed = true; | |
1051 } | |
1052 void clear_incremental_collection_failed() { | |
1053 _incremental_collection_failed = false; | |
1054 } | |
1055 | |
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1056 // accessors |
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1057 void set_expansion_cause(CMSExpansionCause::Cause v) { _expansion_cause = v;} |
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1058 CMSExpansionCause::Cause expansion_cause() const { return _expansion_cause; } |
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1059 |
0 | 1060 private: |
1061 // For parallel young-gen GC support. | |
1062 CMSParGCThreadState** _par_gc_thread_states; | |
1063 | |
1064 // Reason generation was expanded | |
1065 CMSExpansionCause::Cause _expansion_cause; | |
1066 | |
1067 // In support of MinChunkSize being larger than min object size | |
1068 const double _dilatation_factor; | |
1069 | |
1070 enum CollectionTypes { | |
1071 Concurrent_collection_type = 0, | |
1072 MS_foreground_collection_type = 1, | |
1073 MSC_foreground_collection_type = 2, | |
1074 Unknown_collection_type = 3 | |
1075 }; | |
1076 | |
1077 CollectionTypes _debug_collection_type; | |
1078 | |
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1079 // Fraction of current occupancy at which to start a CMS collection which |
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1080 // will collect this generation (at least). |
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1081 double _initiating_occupancy; |
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1082 |
0 | 1083 protected: |
1084 // Shrink generation by specified size (returns false if unable to shrink) | |
1085 virtual void shrink_by(size_t bytes); | |
1086 | |
1087 // Update statistics for GC | |
1088 virtual void update_gc_stats(int level, bool full); | |
1089 | |
1090 // Maximum available space in the generation (including uncommitted) | |
1091 // space. | |
1092 size_t max_available() const; | |
1093 | |
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1094 // getter and initializer for _initiating_occupancy field. |
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1095 double initiating_occupancy() const { return _initiating_occupancy; } |
8035 | 1096 void init_initiating_occupancy(intx io, uintx tr); |
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1097 |
0 | 1098 public: |
1099 ConcurrentMarkSweepGeneration(ReservedSpace rs, size_t initial_byte_size, | |
1100 int level, CardTableRS* ct, | |
1101 bool use_adaptive_freelists, | |
6026 | 1102 FreeBlockDictionary<FreeChunk>::DictionaryChoice); |
0 | 1103 |
1104 // Accessors | |
1105 CMSCollector* collector() const { return _collector; } | |
1106 static void set_collector(CMSCollector* collector) { | |
1107 assert(_collector == NULL, "already set"); | |
1108 _collector = collector; | |
1109 } | |
1110 CompactibleFreeListSpace* cmsSpace() const { return _cmsSpace; } | |
1111 | |
1112 Mutex* freelistLock() const; | |
1113 | |
1114 virtual Generation::Name kind() { return Generation::ConcurrentMarkSweep; } | |
1115 | |
1116 // Adaptive size policy | |
1117 CMSAdaptiveSizePolicy* size_policy(); | |
1118 | |
1119 bool refs_discovery_is_atomic() const { return false; } | |
1120 bool refs_discovery_is_mt() const { | |
1121 // Note: CMS does MT-discovery during the parallel-remark | |
1122 // phases. Use ReferenceProcessorMTMutator to make refs | |
1123 // discovery MT-safe during such phases or other parallel | |
1124 // discovery phases in the future. This may all go away | |
1125 // if/when we decide that refs discovery is sufficiently | |
1126 // rare that the cost of the CAS's involved is in the | |
1127 // noise. That's a measurement that should be done, and | |
1128 // the code simplified if that turns out to be the case. | |
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1129 return ConcGCThreads > 1; |
0 | 1130 } |
1131 | |
1132 // Override | |
1133 virtual void ref_processor_init(); | |
1134 | |
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1135 // Grow generation by specified size (returns false if unable to grow) |
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1136 bool grow_by(size_t bytes); |
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1137 // Grow generation to reserved size. |
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1138 bool grow_to_reserved(); |
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1139 |
0 | 1140 void clear_expansion_cause() { _expansion_cause = CMSExpansionCause::_no_expansion; } |
1141 | |
1142 // Space enquiries | |
1143 size_t capacity() const; | |
1144 size_t used() const; | |
1145 size_t free() const; | |
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1146 double occupancy() const { return ((double)used())/((double)capacity()); } |
0 | 1147 size_t contiguous_available() const; |
1148 size_t unsafe_max_alloc_nogc() const; | |
1149 | |
1150 // over-rides | |
1151 MemRegion used_region() const; | |
1152 MemRegion used_region_at_save_marks() const; | |
1153 | |
1154 // Does a "full" (forced) collection invoked on this generation collect | |
1155 // all younger generations as well? Note that the second conjunct is a | |
1156 // hack to allow the collection of the younger gen first if the flag is | |
1157 // set. This is better than using th policy's should_collect_gen0_first() | |
1158 // since that causes us to do an extra unnecessary pair of restart-&-stop-world. | |
1159 virtual bool full_collects_younger_generations() const { | |
1160 return UseCMSCompactAtFullCollection && !CollectGen0First; | |
1161 } | |
1162 | |
1163 void space_iterate(SpaceClosure* blk, bool usedOnly = false); | |
1164 | |
1165 // Support for compaction | |
1166 CompactibleSpace* first_compaction_space() const; | |
1167 // Adjust quantites in the generation affected by | |
1168 // the compaction. | |
1169 void reset_after_compaction(); | |
1170 | |
1171 // Allocation support | |
1172 HeapWord* allocate(size_t size, bool tlab); | |
1173 HeapWord* have_lock_and_allocate(size_t size, bool tlab); | |
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1174 oop promote(oop obj, size_t obj_size); |
0 | 1175 HeapWord* par_allocate(size_t size, bool tlab) { |
1176 return allocate(size, tlab); | |
1177 } | |
1178 | |
1179 // Incremental mode triggering. | |
1180 HeapWord* allocation_limit_reached(Space* space, HeapWord* top, | |
1181 size_t word_size); | |
1182 | |
1183 // Used by CMSStats to track direct allocation. The value is sampled and | |
1184 // reset after each young gen collection. | |
1185 size_t direct_allocated_words() const { return _direct_allocated_words; } | |
1186 void reset_direct_allocated_words() { _direct_allocated_words = 0; } | |
1187 | |
1188 // Overrides for parallel promotion. | |
1189 virtual oop par_promote(int thread_num, | |
1190 oop obj, markOop m, size_t word_sz); | |
1191 // This one should not be called for CMS. | |
1192 virtual void par_promote_alloc_undo(int thread_num, | |
1193 HeapWord* obj, size_t word_sz); | |
1194 virtual void par_promote_alloc_done(int thread_num); | |
1195 virtual void par_oop_since_save_marks_iterate_done(int thread_num); | |
1196 | |
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1197 virtual bool promotion_attempt_is_safe(size_t promotion_in_bytes) const; |
0 | 1198 |
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1199 // Inform this (non-young) generation that a promotion failure was |
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1200 // encountered during a collection of a younger generation that |
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1201 // promotes into this generation. |
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1202 virtual void promotion_failure_occurred(); |
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1203 |
0 | 1204 bool should_collect(bool full, size_t size, bool tlab); |
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1205 virtual bool should_concurrent_collect() const; |
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1206 virtual bool is_too_full() const; |
0 | 1207 void collect(bool full, |
1208 bool clear_all_soft_refs, | |
1209 size_t size, | |
1210 bool tlab); | |
1211 | |
1212 HeapWord* expand_and_allocate(size_t word_size, | |
1213 bool tlab, | |
1214 bool parallel = false); | |
1215 | |
1216 // GC prologue and epilogue | |
1217 void gc_prologue(bool full); | |
1218 void gc_prologue_work(bool full, bool registerClosure, | |
1219 ModUnionClosure* modUnionClosure); | |
1220 void gc_epilogue(bool full); | |
1221 void gc_epilogue_work(bool full); | |
1222 | |
1223 // Time since last GC of this generation | |
1224 jlong time_of_last_gc(jlong now) { | |
1225 return collector()->time_of_last_gc(now); | |
1226 } | |
1227 void update_time_of_last_gc(jlong now) { | |
1228 collector()-> update_time_of_last_gc(now); | |
1229 } | |
1230 | |
1231 // Allocation failure | |
1232 void expand(size_t bytes, size_t expand_bytes, | |
1233 CMSExpansionCause::Cause cause); | |
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1234 virtual bool expand(size_t bytes, size_t expand_bytes); |
0 | 1235 void shrink(size_t bytes); |
1236 HeapWord* expand_and_par_lab_allocate(CMSParGCThreadState* ps, size_t word_sz); | |
1237 bool expand_and_ensure_spooling_space(PromotionInfo* promo); | |
1238 | |
1239 // Iteration support and related enquiries | |
1240 void save_marks(); | |
1241 bool no_allocs_since_save_marks(); | |
1242 void object_iterate_since_last_GC(ObjectClosure* cl); | |
1243 void younger_refs_iterate(OopsInGenClosure* cl); | |
1244 | |
1245 // Iteration support specific to CMS generations | |
1246 void save_sweep_limit(); | |
1247 | |
1248 // More iteration support | |
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1249 virtual void oop_iterate(MemRegion mr, ExtendedOopClosure* cl); |
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1250 virtual void oop_iterate(ExtendedOopClosure* cl); |
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1251 virtual void safe_object_iterate(ObjectClosure* cl); |
0 | 1252 virtual void object_iterate(ObjectClosure* cl); |
1253 | |
1254 // Need to declare the full complement of closures, whether we'll | |
1255 // override them or not, or get message from the compiler: | |
1256 // oop_since_save_marks_iterate_nv hides virtual function... | |
1257 #define CMS_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \ | |
1258 void oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl); | |
1259 ALL_SINCE_SAVE_MARKS_CLOSURES(CMS_SINCE_SAVE_MARKS_DECL) | |
1260 | |
1261 // Smart allocation XXX -- move to CFLSpace? | |
1262 void setNearLargestChunk(); | |
1263 bool isNearLargestChunk(HeapWord* addr); | |
1264 | |
1265 // Get the chunk at the end of the space. Delagates to | |
1266 // the space. | |
1267 FreeChunk* find_chunk_at_end(); | |
1268 | |
1269 void post_compact(); | |
1270 | |
1271 // Debugging | |
1272 void prepare_for_verify(); | |
6008 | 1273 void verify(); |
0 | 1274 void print_statistics() PRODUCT_RETURN; |
1275 | |
1276 // Performance Counters support | |
1277 virtual void update_counters(); | |
1278 virtual void update_counters(size_t used); | |
1279 void initialize_performance_counters(); | |
1280 CollectorCounters* counters() { return collector()->counters(); } | |
1281 | |
1282 // Support for parallel remark of survivor space | |
1283 void* get_data_recorder(int thr_num) { | |
1284 //Delegate to collector | |
1285 return collector()->get_data_recorder(thr_num); | |
1286 } | |
1287 | |
1288 // Printing | |
1289 const char* name() const; | |
1290 virtual const char* short_name() const { return "CMS"; } | |
1291 void print() const; | |
1292 void printOccupancy(const char* s); | |
1293 bool must_be_youngest() const { return false; } | |
1294 bool must_be_oldest() const { return true; } | |
1295 | |
1296 void compute_new_size(); | |
1297 | |
1298 CollectionTypes debug_collection_type() { return _debug_collection_type; } | |
1299 void rotate_debug_collection_type(); | |
1300 }; | |
1301 | |
1302 class ASConcurrentMarkSweepGeneration : public ConcurrentMarkSweepGeneration { | |
1303 | |
1304 // Return the size policy from the heap's collector | |
1305 // policy casted to CMSAdaptiveSizePolicy*. | |
1306 CMSAdaptiveSizePolicy* cms_size_policy() const; | |
1307 | |
1308 // Resize the generation based on the adaptive size | |
1309 // policy. | |
1310 void resize(size_t cur_promo, size_t desired_promo); | |
1311 | |
1312 // Return the GC counters from the collector policy | |
1313 CMSGCAdaptivePolicyCounters* gc_adaptive_policy_counters(); | |
1314 | |
1315 virtual void shrink_by(size_t bytes); | |
1316 | |
1317 public: | |
1318 virtual void compute_new_size(); | |
1319 ASConcurrentMarkSweepGeneration(ReservedSpace rs, size_t initial_byte_size, | |
1320 int level, CardTableRS* ct, | |
1321 bool use_adaptive_freelists, | |
6026 | 1322 FreeBlockDictionary<FreeChunk>::DictionaryChoice |
0 | 1323 dictionaryChoice) : |
1324 ConcurrentMarkSweepGeneration(rs, initial_byte_size, level, ct, | |
1325 use_adaptive_freelists, dictionaryChoice) {} | |
1326 | |
1327 virtual const char* short_name() const { return "ASCMS"; } | |
1328 virtual Generation::Name kind() { return Generation::ASConcurrentMarkSweep; } | |
1329 | |
1330 virtual void update_counters(); | |
1331 virtual void update_counters(size_t used); | |
1332 }; | |
1333 | |
1334 // | |
1335 // Closures of various sorts used by CMS to accomplish its work | |
1336 // | |
1337 | |
1338 // This closure is used to check that a certain set of oops is empty. | |
1339 class FalseClosure: public OopClosure { | |
1340 public: | |
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1341 void do_oop(oop* p) { guarantee(false, "Should be an empty set"); } |
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1342 void do_oop(narrowOop* p) { guarantee(false, "Should be an empty set"); } |
0 | 1343 }; |
1344 | |
1345 // This closure is used to do concurrent marking from the roots | |
1346 // following the first checkpoint. | |
1347 class MarkFromRootsClosure: public BitMapClosure { | |
1348 CMSCollector* _collector; | |
1349 MemRegion _span; | |
1350 CMSBitMap* _bitMap; | |
1351 CMSBitMap* _mut; | |
1352 CMSMarkStack* _markStack; | |
1353 bool _yield; | |
1354 int _skipBits; | |
1355 HeapWord* _finger; | |
1356 HeapWord* _threshold; | |
1357 DEBUG_ONLY(bool _verifying;) | |
1358 | |
1359 public: | |
1360 MarkFromRootsClosure(CMSCollector* collector, MemRegion span, | |
1361 CMSBitMap* bitMap, | |
1362 CMSMarkStack* markStack, | |
1363 bool should_yield, bool verifying = false); | |
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1364 bool do_bit(size_t offset); |
0 | 1365 void reset(HeapWord* addr); |
1366 inline void do_yield_check(); | |
1367 | |
1368 private: | |
1369 void scanOopsInOop(HeapWord* ptr); | |
1370 void do_yield_work(); | |
1371 }; | |
1372 | |
1373 // This closure is used to do concurrent multi-threaded | |
1374 // marking from the roots following the first checkpoint. | |
1375 // XXX This should really be a subclass of The serial version | |
1376 // above, but i have not had the time to refactor things cleanly. | |
1377 // That willbe done for Dolphin. | |
1378 class Par_MarkFromRootsClosure: public BitMapClosure { | |
1379 CMSCollector* _collector; | |
1380 MemRegion _whole_span; | |
1381 MemRegion _span; | |
1382 CMSBitMap* _bit_map; | |
1383 CMSBitMap* _mut; | |
1384 OopTaskQueue* _work_queue; | |
1385 CMSMarkStack* _overflow_stack; | |
1386 bool _yield; | |
1387 int _skip_bits; | |
1388 HeapWord* _finger; | |
1389 HeapWord* _threshold; | |
1390 CMSConcMarkingTask* _task; | |
1391 public: | |
1392 Par_MarkFromRootsClosure(CMSConcMarkingTask* task, CMSCollector* collector, | |
1393 MemRegion span, | |
1394 CMSBitMap* bit_map, | |
1395 OopTaskQueue* work_queue, | |
1396 CMSMarkStack* overflow_stack, | |
1397 bool should_yield); | |
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1398 bool do_bit(size_t offset); |
0 | 1399 inline void do_yield_check(); |
1400 | |
1401 private: | |
1402 void scan_oops_in_oop(HeapWord* ptr); | |
1403 void do_yield_work(); | |
1404 bool get_work_from_overflow_stack(); | |
1405 }; | |
1406 | |
1407 // The following closures are used to do certain kinds of verification of | |
1408 // CMS marking. | |
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1409 class PushAndMarkVerifyClosure: public CMSOopClosure { |
0 | 1410 CMSCollector* _collector; |
1411 MemRegion _span; | |
1412 CMSBitMap* _verification_bm; | |
1413 CMSBitMap* _cms_bm; | |
1414 CMSMarkStack* _mark_stack; | |
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1415 protected: |
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1416 void do_oop(oop p); |
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1417 template <class T> inline void do_oop_work(T *p) { |
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1418 oop obj = oopDesc::load_decode_heap_oop(p); |
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1419 do_oop(obj); |
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1420 } |
0 | 1421 public: |
1422 PushAndMarkVerifyClosure(CMSCollector* cms_collector, | |
1423 MemRegion span, | |
1424 CMSBitMap* verification_bm, | |
1425 CMSBitMap* cms_bm, | |
1426 CMSMarkStack* mark_stack); | |
1427 void do_oop(oop* p); | |
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1428 void do_oop(narrowOop* p); |
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1429 |
0 | 1430 // Deal with a stack overflow condition |
1431 void handle_stack_overflow(HeapWord* lost); | |
1432 }; | |
1433 | |
1434 class MarkFromRootsVerifyClosure: public BitMapClosure { | |
1435 CMSCollector* _collector; | |
1436 MemRegion _span; | |
1437 CMSBitMap* _verification_bm; | |
1438 CMSBitMap* _cms_bm; | |
1439 CMSMarkStack* _mark_stack; | |
1440 HeapWord* _finger; | |
1441 PushAndMarkVerifyClosure _pam_verify_closure; | |
1442 public: | |
1443 MarkFromRootsVerifyClosure(CMSCollector* collector, MemRegion span, | |
1444 CMSBitMap* verification_bm, | |
1445 CMSBitMap* cms_bm, | |
1446 CMSMarkStack* mark_stack); | |
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1447 bool do_bit(size_t offset); |
0 | 1448 void reset(HeapWord* addr); |
1449 }; | |
1450 | |
1451 | |
1452 // This closure is used to check that a certain set of bits is | |
1453 // "empty" (i.e. the bit vector doesn't have any 1-bits). | |
1454 class FalseBitMapClosure: public BitMapClosure { | |
1455 public: | |
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1456 bool do_bit(size_t offset) { |
0 | 1457 guarantee(false, "Should not have a 1 bit"); |
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1458 return true; |
0 | 1459 } |
1460 }; | |
1461 | |
1462 // This closure is used during the second checkpointing phase | |
1463 // to rescan the marked objects on the dirty cards in the mod | |
1464 // union table and the card table proper. It's invoked via | |
1465 // MarkFromDirtyCardsClosure below. It uses either | |
1466 // [Par_]MarkRefsIntoAndScanClosure (Par_ in the parallel case) | |
1467 // declared in genOopClosures.hpp to accomplish some of its work. | |
1468 // In the parallel case the bitMap is shared, so access to | |
1469 // it needs to be suitably synchronized for updates by embedded | |
1470 // closures that update it; however, this closure itself only | |
1471 // reads the bit_map and because it is idempotent, is immune to | |
1472 // reading stale values. | |
1473 class ScanMarkedObjectsAgainClosure: public UpwardsObjectClosure { | |
1474 #ifdef ASSERT | |
1475 CMSCollector* _collector; | |
1476 MemRegion _span; | |
1477 union { | |
1478 CMSMarkStack* _mark_stack; | |
1479 OopTaskQueue* _work_queue; | |
1480 }; | |
1481 #endif // ASSERT | |
1482 bool _parallel; | |
1483 CMSBitMap* _bit_map; | |
1484 union { | |
1485 MarkRefsIntoAndScanClosure* _scan_closure; | |
1486 Par_MarkRefsIntoAndScanClosure* _par_scan_closure; | |
1487 }; | |
1488 | |
1489 public: | |
1490 ScanMarkedObjectsAgainClosure(CMSCollector* collector, | |
1491 MemRegion span, | |
1492 ReferenceProcessor* rp, | |
1493 CMSBitMap* bit_map, | |
1494 CMSMarkStack* mark_stack, | |
1495 MarkRefsIntoAndScanClosure* cl): | |
1496 #ifdef ASSERT | |
1497 _collector(collector), | |
1498 _span(span), | |
1499 _mark_stack(mark_stack), | |
1500 #endif // ASSERT | |
1501 _parallel(false), | |
1502 _bit_map(bit_map), | |
1503 _scan_closure(cl) { } | |
1504 | |
1505 ScanMarkedObjectsAgainClosure(CMSCollector* collector, | |
1506 MemRegion span, | |
1507 ReferenceProcessor* rp, | |
1508 CMSBitMap* bit_map, | |
1509 OopTaskQueue* work_queue, | |
1510 Par_MarkRefsIntoAndScanClosure* cl): | |
1511 #ifdef ASSERT | |
1512 _collector(collector), | |
1513 _span(span), | |
1514 _work_queue(work_queue), | |
1515 #endif // ASSERT | |
1516 _parallel(true), | |
1517 _bit_map(bit_map), | |
1518 _par_scan_closure(cl) { } | |
1519 | |
1520 void do_object(oop obj) { | |
1521 guarantee(false, "Call do_object_b(oop, MemRegion) instead"); | |
1522 } | |
1523 bool do_object_b(oop obj) { | |
1524 guarantee(false, "Call do_object_b(oop, MemRegion) form instead"); | |
1525 return false; | |
1526 } | |
1527 bool do_object_bm(oop p, MemRegion mr); | |
1528 }; | |
1529 | |
1530 // This closure is used during the second checkpointing phase | |
1531 // to rescan the marked objects on the dirty cards in the mod | |
1532 // union table and the card table proper. It invokes | |
1533 // ScanMarkedObjectsAgainClosure above to accomplish much of its work. | |
1534 // In the parallel case, the bit map is shared and requires | |
1535 // synchronized access. | |
1536 class MarkFromDirtyCardsClosure: public MemRegionClosure { | |
1537 CompactibleFreeListSpace* _space; | |
1538 ScanMarkedObjectsAgainClosure _scan_cl; | |
1539 size_t _num_dirty_cards; | |
1540 | |
1541 public: | |
1542 MarkFromDirtyCardsClosure(CMSCollector* collector, | |
1543 MemRegion span, | |
1544 CompactibleFreeListSpace* space, | |
1545 CMSBitMap* bit_map, | |
1546 CMSMarkStack* mark_stack, | |
1547 MarkRefsIntoAndScanClosure* cl): | |
1548 _space(space), | |
1549 _num_dirty_cards(0), | |
1550 _scan_cl(collector, span, collector->ref_processor(), bit_map, | |
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1551 mark_stack, cl) { } |
0 | 1552 |
1553 MarkFromDirtyCardsClosure(CMSCollector* collector, | |
1554 MemRegion span, | |
1555 CompactibleFreeListSpace* space, | |
1556 CMSBitMap* bit_map, | |
1557 OopTaskQueue* work_queue, | |
1558 Par_MarkRefsIntoAndScanClosure* cl): | |
1559 _space(space), | |
1560 _num_dirty_cards(0), | |
1561 _scan_cl(collector, span, collector->ref_processor(), bit_map, | |
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1562 work_queue, cl) { } |
0 | 1563 |
1564 void do_MemRegion(MemRegion mr); | |
1565 void set_space(CompactibleFreeListSpace* space) { _space = space; } | |
1566 size_t num_dirty_cards() { return _num_dirty_cards; } | |
1567 }; | |
1568 | |
1569 // This closure is used in the non-product build to check | |
1570 // that there are no MemRegions with a certain property. | |
1571 class FalseMemRegionClosure: public MemRegionClosure { | |
1572 void do_MemRegion(MemRegion mr) { | |
1573 guarantee(!mr.is_empty(), "Shouldn't be empty"); | |
1574 guarantee(false, "Should never be here"); | |
1575 } | |
1576 }; | |
1577 | |
1578 // This closure is used during the precleaning phase | |
1579 // to "carefully" rescan marked objects on dirty cards. | |
1580 // It uses MarkRefsIntoAndScanClosure declared in genOopClosures.hpp | |
1581 // to accomplish some of its work. | |
1582 class ScanMarkedObjectsAgainCarefullyClosure: public ObjectClosureCareful { | |
1583 CMSCollector* _collector; | |
1584 MemRegion _span; | |
1585 bool _yield; | |
1586 Mutex* _freelistLock; | |
1587 CMSBitMap* _bitMap; | |
1588 CMSMarkStack* _markStack; | |
1589 MarkRefsIntoAndScanClosure* _scanningClosure; | |
1590 | |
1591 public: | |
1592 ScanMarkedObjectsAgainCarefullyClosure(CMSCollector* collector, | |
1593 MemRegion span, | |
1594 CMSBitMap* bitMap, | |
1595 CMSMarkStack* markStack, | |
1596 MarkRefsIntoAndScanClosure* cl, | |
1597 bool should_yield): | |
1598 _collector(collector), | |
1599 _span(span), | |
1600 _yield(should_yield), | |
1601 _bitMap(bitMap), | |
1602 _markStack(markStack), | |
1603 _scanningClosure(cl) { | |
1604 } | |
1605 | |
1606 void do_object(oop p) { | |
1607 guarantee(false, "call do_object_careful instead"); | |
1608 } | |
1609 | |
1610 size_t do_object_careful(oop p) { | |
1611 guarantee(false, "Unexpected caller"); | |
1612 return 0; | |
1613 } | |
1614 | |
1615 size_t do_object_careful_m(oop p, MemRegion mr); | |
1616 | |
1617 void setFreelistLock(Mutex* m) { | |
1618 _freelistLock = m; | |
1619 _scanningClosure->set_freelistLock(m); | |
1620 } | |
1621 | |
1622 private: | |
1623 inline bool do_yield_check(); | |
1624 | |
1625 void do_yield_work(); | |
1626 }; | |
1627 | |
1628 class SurvivorSpacePrecleanClosure: public ObjectClosureCareful { | |
1629 CMSCollector* _collector; | |
1630 MemRegion _span; | |
1631 bool _yield; | |
1632 CMSBitMap* _bit_map; | |
1633 CMSMarkStack* _mark_stack; | |
1634 PushAndMarkClosure* _scanning_closure; | |
1635 unsigned int _before_count; | |
1636 | |
1637 public: | |
1638 SurvivorSpacePrecleanClosure(CMSCollector* collector, | |
1639 MemRegion span, | |
1640 CMSBitMap* bit_map, | |
1641 CMSMarkStack* mark_stack, | |
1642 PushAndMarkClosure* cl, | |
1643 unsigned int before_count, | |
1644 bool should_yield): | |
1645 _collector(collector), | |
1646 _span(span), | |
1647 _yield(should_yield), | |
1648 _bit_map(bit_map), | |
1649 _mark_stack(mark_stack), | |
1650 _scanning_closure(cl), | |
1651 _before_count(before_count) | |
1652 { } | |
1653 | |
1654 void do_object(oop p) { | |
1655 guarantee(false, "call do_object_careful instead"); | |
1656 } | |
1657 | |
1658 size_t do_object_careful(oop p); | |
1659 | |
1660 size_t do_object_careful_m(oop p, MemRegion mr) { | |
1661 guarantee(false, "Unexpected caller"); | |
1662 return 0; | |
1663 } | |
1664 | |
1665 private: | |
1666 inline void do_yield_check(); | |
1667 void do_yield_work(); | |
1668 }; | |
1669 | |
1670 // This closure is used to accomplish the sweeping work | |
1671 // after the second checkpoint but before the concurrent reset | |
1672 // phase. | |
1673 // | |
1674 // Terminology | |
1675 // left hand chunk (LHC) - block of one or more chunks currently being | |
1676 // coalesced. The LHC is available for coalescing with a new chunk. | |
1677 // right hand chunk (RHC) - block that is currently being swept that is | |
1678 // free or garbage that can be coalesced with the LHC. | |
1679 // _inFreeRange is true if there is currently a LHC | |
1680 // _lastFreeRangeCoalesced is true if the LHC consists of more than one chunk. | |
1681 // _freeRangeInFreeLists is true if the LHC is in the free lists. | |
1682 // _freeFinger is the address of the current LHC | |
1683 class SweepClosure: public BlkClosureCareful { | |
1684 CMSCollector* _collector; // collector doing the work | |
1685 ConcurrentMarkSweepGeneration* _g; // Generation being swept | |
1686 CompactibleFreeListSpace* _sp; // Space being swept | |
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1687 HeapWord* _limit;// the address at or above which the sweep should stop |
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1688 // because we do not expect newly garbage blocks |
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1689 // eligible for sweeping past that address. |
0 | 1690 Mutex* _freelistLock; // Free list lock (in space) |
1691 CMSBitMap* _bitMap; // Marking bit map (in | |
1692 // generation) | |
1693 bool _inFreeRange; // Indicates if we are in the | |
1694 // midst of a free run | |
1695 bool _freeRangeInFreeLists; | |
1696 // Often, we have just found | |
1697 // a free chunk and started | |
1698 // a new free range; we do not | |
1699 // eagerly remove this chunk from | |
1700 // the free lists unless there is | |
1701 // a possibility of coalescing. | |
1702 // When true, this flag indicates | |
1703 // that the _freeFinger below | |
1704 // points to a potentially free chunk | |
1705 // that may still be in the free lists | |
1706 bool _lastFreeRangeCoalesced; | |
1707 // free range contains chunks | |
1708 // coalesced | |
1709 bool _yield; | |
1710 // Whether sweeping should be | |
1711 // done with yields. For instance | |
1712 // when done by the foreground | |
1713 // collector we shouldn't yield. | |
1714 HeapWord* _freeFinger; // When _inFreeRange is set, the | |
1715 // pointer to the "left hand | |
1716 // chunk" | |
1717 size_t _freeRangeSize; | |
1718 // When _inFreeRange is set, this | |
1719 // indicates the accumulated size | |
1720 // of the "left hand chunk" | |
1721 NOT_PRODUCT( | |
1722 size_t _numObjectsFreed; | |
1723 size_t _numWordsFreed; | |
1724 size_t _numObjectsLive; | |
1725 size_t _numWordsLive; | |
1726 size_t _numObjectsAlreadyFree; | |
1727 size_t _numWordsAlreadyFree; | |
1728 FreeChunk* _last_fc; | |
1729 ) | |
1730 private: | |
1731 // Code that is common to a free chunk or garbage when | |
1732 // encountered during sweeping. | |
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1733 void do_post_free_or_garbage_chunk(FreeChunk *fc, size_t chunkSize); |
0 | 1734 // Process a free chunk during sweeping. |
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1735 void do_already_free_chunk(FreeChunk *fc); |
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1736 // Work method called when processing an already free or a |
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1737 // freshly garbage chunk to do a lookahead and possibly a |
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1738 // premptive flush if crossing over _limit. |
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1739 void lookahead_and_flush(FreeChunk* fc, size_t chunkSize); |
0 | 1740 // Process a garbage chunk during sweeping. |
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1741 size_t do_garbage_chunk(FreeChunk *fc); |
0 | 1742 // Process a live chunk during sweeping. |
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1743 size_t do_live_chunk(FreeChunk* fc); |
0 | 1744 |
1745 // Accessors. | |
1746 HeapWord* freeFinger() const { return _freeFinger; } | |
1747 void set_freeFinger(HeapWord* v) { _freeFinger = v; } | |
1748 bool inFreeRange() const { return _inFreeRange; } | |
1749 void set_inFreeRange(bool v) { _inFreeRange = v; } | |
1750 bool lastFreeRangeCoalesced() const { return _lastFreeRangeCoalesced; } | |
1751 void set_lastFreeRangeCoalesced(bool v) { _lastFreeRangeCoalesced = v; } | |
1752 bool freeRangeInFreeLists() const { return _freeRangeInFreeLists; } | |
1753 void set_freeRangeInFreeLists(bool v) { _freeRangeInFreeLists = v; } | |
1754 | |
1755 // Initialize a free range. | |
1756 void initialize_free_range(HeapWord* freeFinger, bool freeRangeInFreeLists); | |
1757 // Return this chunk to the free lists. | |
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1758 void flush_cur_free_chunk(HeapWord* chunk, size_t size); |
0 | 1759 |
1760 // Check if we should yield and do so when necessary. | |
1761 inline void do_yield_check(HeapWord* addr); | |
1762 | |
1763 // Yield | |
1764 void do_yield_work(HeapWord* addr); | |
1765 | |
1766 // Debugging/Printing | |
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1767 void print_free_block_coalesced(FreeChunk* fc) const; |
0 | 1768 |
1769 public: | |
1770 SweepClosure(CMSCollector* collector, ConcurrentMarkSweepGeneration* g, | |
1771 CMSBitMap* bitMap, bool should_yield); | |
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1772 ~SweepClosure() PRODUCT_RETURN; |
0 | 1773 |
1774 size_t do_blk_careful(HeapWord* addr); | |
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1775 void print() const { print_on(tty); } |
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1776 void print_on(outputStream *st) const; |
0 | 1777 }; |
1778 | |
1779 // Closures related to weak references processing | |
1780 | |
1781 // During CMS' weak reference processing, this is a | |
1782 // work-routine/closure used to complete transitive | |
1783 // marking of objects as live after a certain point | |
1784 // in which an initial set has been completely accumulated. | |
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1785 // This closure is currently used both during the final |
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1786 // remark stop-world phase, as well as during the concurrent |
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1787 // precleaning of the discovered reference lists. |
0 | 1788 class CMSDrainMarkingStackClosure: public VoidClosure { |
1789 CMSCollector* _collector; | |
1790 MemRegion _span; | |
1791 CMSMarkStack* _mark_stack; | |
1792 CMSBitMap* _bit_map; | |
1793 CMSKeepAliveClosure* _keep_alive; | |
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1794 bool _concurrent_precleaning; |
0 | 1795 public: |
1796 CMSDrainMarkingStackClosure(CMSCollector* collector, MemRegion span, | |
1797 CMSBitMap* bit_map, CMSMarkStack* mark_stack, | |
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1798 CMSKeepAliveClosure* keep_alive, |
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1799 bool cpc): |
0 | 1800 _collector(collector), |
1801 _span(span), | |
1802 _bit_map(bit_map), | |
1803 _mark_stack(mark_stack), | |
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1804 _keep_alive(keep_alive), |
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1805 _concurrent_precleaning(cpc) { |
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1806 assert(_concurrent_precleaning == _keep_alive->concurrent_precleaning(), |
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1807 "Mismatch"); |
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1808 } |
0 | 1809 |
1810 void do_void(); | |
1811 }; | |
1812 | |
1813 // A parallel version of CMSDrainMarkingStackClosure above. | |
1814 class CMSParDrainMarkingStackClosure: public VoidClosure { | |
1815 CMSCollector* _collector; | |
1816 MemRegion _span; | |
1817 OopTaskQueue* _work_queue; | |
1818 CMSBitMap* _bit_map; | |
1819 CMSInnerParMarkAndPushClosure _mark_and_push; | |
1820 | |
1821 public: | |
1822 CMSParDrainMarkingStackClosure(CMSCollector* collector, | |
1823 MemRegion span, CMSBitMap* bit_map, | |
1824 OopTaskQueue* work_queue): | |
1825 _collector(collector), | |
1826 _span(span), | |
1827 _bit_map(bit_map), | |
1828 _work_queue(work_queue), | |
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1829 _mark_and_push(collector, span, bit_map, work_queue) { } |
0 | 1830 |
1831 public: | |
1832 void trim_queue(uint max); | |
1833 void do_void(); | |
1834 }; | |
1835 | |
1836 // Allow yielding or short-circuiting of reference list | |
1837 // prelceaning work. | |
1838 class CMSPrecleanRefsYieldClosure: public YieldClosure { | |
1839 CMSCollector* _collector; | |
1840 void do_yield_work(); | |
1841 public: | |
1842 CMSPrecleanRefsYieldClosure(CMSCollector* collector): | |
1843 _collector(collector) {} | |
1844 virtual bool should_return(); | |
1845 }; | |
1846 | |
1847 | |
1848 // Convenience class that locks free list locks for given CMS collector | |
1849 class FreelistLocker: public StackObj { | |
1850 private: | |
1851 CMSCollector* _collector; | |
1852 public: | |
1853 FreelistLocker(CMSCollector* collector): | |
1854 _collector(collector) { | |
1855 _collector->getFreelistLocks(); | |
1856 } | |
1857 | |
1858 ~FreelistLocker() { | |
1859 _collector->releaseFreelistLocks(); | |
1860 } | |
1861 }; | |
1862 | |
1863 // Mark all dead objects in a given space. | |
1864 class MarkDeadObjectsClosure: public BlkClosure { | |
1865 const CMSCollector* _collector; | |
1866 const CompactibleFreeListSpace* _sp; | |
1867 CMSBitMap* _live_bit_map; | |
1868 CMSBitMap* _dead_bit_map; | |
1869 public: | |
1870 MarkDeadObjectsClosure(const CMSCollector* collector, | |
1871 const CompactibleFreeListSpace* sp, | |
1872 CMSBitMap *live_bit_map, | |
1873 CMSBitMap *dead_bit_map) : | |
1874 _collector(collector), | |
1875 _sp(sp), | |
1876 _live_bit_map(live_bit_map), | |
1877 _dead_bit_map(dead_bit_map) {} | |
1878 size_t do_blk(HeapWord* addr); | |
1879 }; | |
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1880 |
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1881 class TraceCMSMemoryManagerStats : public TraceMemoryManagerStats { |
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1882 |
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1883 public: |
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1884 TraceCMSMemoryManagerStats(CMSCollector::CollectorState phase, GCCause::Cause cause); |
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1885 }; |
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1886 |
1972 | 1887 |
1888 #endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CONCURRENTMARKSWEEPGENERATION_HPP |