Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp @ 13037:c8fc12209830
8027616: Off by one error in putback for compressed oops nashorn performance improvement
Summary: Should compare bounds greater than or equal 4G when deciding if shift is needed or CDS area + compressed class space are within 4G of each other.
Reviewed-by: stefank, hseigel, zgu
author | coleenp |
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date | Thu, 31 Oct 2013 14:11:02 -0400 |
parents | ca9dedeebdec |
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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 | |
10405 | 28 #include "gc_implementation/shared/gcHeapSummary.hpp" |
1972 | 29 #include "gc_implementation/shared/gSpaceCounters.hpp" |
30 #include "gc_implementation/shared/gcStats.hpp" | |
10405 | 31 #include "gc_implementation/shared/gcWhen.hpp" |
1972 | 32 #include "gc_implementation/shared/generationCounters.hpp" |
6026 | 33 #include "memory/freeBlockDictionary.hpp" |
1972 | 34 #include "memory/generation.hpp" |
35 #include "runtime/mutexLocker.hpp" | |
36 #include "runtime/virtualspace.hpp" | |
37 #include "services/memoryService.hpp" | |
38 #include "utilities/bitMap.inline.hpp" | |
39 #include "utilities/stack.inline.hpp" | |
40 #include "utilities/taskqueue.hpp" | |
41 #include "utilities/yieldingWorkgroup.hpp" | |
42 | |
0 | 43 // ConcurrentMarkSweepGeneration is in support of a concurrent |
44 // mark-sweep old generation in the Detlefs-Printezis--Boehm-Demers-Schenker | |
45 // style. We assume, for now, that this generation is always the | |
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46 // seniormost generation and for simplicity |
0 | 47 // in the first implementation, that this generation is a single compactible |
48 // space. Neither of these restrictions appears essential, and will be | |
49 // relaxed in the future when more time is available to implement the | |
50 // greater generality (and there's a need for it). | |
51 // | |
52 // Concurrent mode failures are currently handled by | |
53 // means of a sliding mark-compact. | |
54 | |
55 class CMSAdaptiveSizePolicy; | |
56 class CMSConcMarkingTask; | |
57 class CMSGCAdaptivePolicyCounters; | |
10405 | 58 class CMSTracer; |
59 class ConcurrentGCTimer; | |
0 | 60 class ConcurrentMarkSweepGeneration; |
61 class ConcurrentMarkSweepPolicy; | |
62 class ConcurrentMarkSweepThread; | |
63 class CompactibleFreeListSpace; | |
64 class FreeChunk; | |
65 class PromotionInfo; | |
66 class ScanMarkedObjectsAgainCarefullyClosure; | |
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67 class TenuredGeneration; |
10405 | 68 class SerialOldTracer; |
0 | 69 |
70 // A generic CMS bit map. It's the basis for both the CMS marking bit map | |
71 // as well as for the mod union table (in each case only a subset of the | |
72 // methods are used). This is essentially a wrapper around the BitMap class, | |
73 // with one bit per (1<<_shifter) HeapWords. (i.e. for the marking bit map, | |
74 // we have _shifter == 0. and for the mod union table we have | |
75 // shifter == CardTableModRefBS::card_shift - LogHeapWordSize.) | |
76 // XXX 64-bit issues in BitMap? | |
77 class CMSBitMap VALUE_OBJ_CLASS_SPEC { | |
78 friend class VMStructs; | |
79 | |
80 HeapWord* _bmStartWord; // base address of range covered by map | |
81 size_t _bmWordSize; // map size (in #HeapWords covered) | |
82 const int _shifter; // shifts to convert HeapWord to bit position | |
83 VirtualSpace _virtual_space; // underlying the bit map | |
84 BitMap _bm; // the bit map itself | |
85 public: | |
86 Mutex* const _lock; // mutex protecting _bm; | |
87 | |
88 public: | |
89 // constructor | |
90 CMSBitMap(int shifter, int mutex_rank, const char* mutex_name); | |
91 | |
92 // allocates the actual storage for the map | |
93 bool allocate(MemRegion mr); | |
94 // field getter | |
95 Mutex* lock() const { return _lock; } | |
96 // locking verifier convenience function | |
97 void assert_locked() const PRODUCT_RETURN; | |
98 | |
99 // inquiries | |
100 HeapWord* startWord() const { return _bmStartWord; } | |
101 size_t sizeInWords() const { return _bmWordSize; } | |
102 size_t sizeInBits() const { return _bm.size(); } | |
103 // the following is one past the last word in space | |
104 HeapWord* endWord() const { return _bmStartWord + _bmWordSize; } | |
105 | |
106 // reading marks | |
107 bool isMarked(HeapWord* addr) const; | |
108 bool par_isMarked(HeapWord* addr) const; // do not lock checks | |
109 bool isUnmarked(HeapWord* addr) const; | |
110 bool isAllClear() const; | |
111 | |
112 // writing marks | |
113 void mark(HeapWord* addr); | |
114 // For marking by parallel GC threads; | |
115 // returns true if we did, false if another thread did | |
116 bool par_mark(HeapWord* addr); | |
117 | |
118 void mark_range(MemRegion mr); | |
119 void par_mark_range(MemRegion mr); | |
120 void mark_large_range(MemRegion mr); | |
121 void par_mark_large_range(MemRegion mr); | |
122 void par_clear(HeapWord* addr); // For unmarking by parallel GC threads. | |
123 void clear_range(MemRegion mr); | |
124 void par_clear_range(MemRegion mr); | |
125 void clear_large_range(MemRegion mr); | |
126 void par_clear_large_range(MemRegion mr); | |
127 void clear_all(); | |
128 void clear_all_incrementally(); // Not yet implemented!! | |
129 | |
130 NOT_PRODUCT( | |
131 // checks the memory region for validity | |
132 void region_invariant(MemRegion mr); | |
133 ) | |
134 | |
135 // iteration | |
136 void iterate(BitMapClosure* cl) { | |
137 _bm.iterate(cl); | |
138 } | |
139 void iterate(BitMapClosure* cl, HeapWord* left, HeapWord* right); | |
140 void dirty_range_iterate_clear(MemRegionClosure* cl); | |
141 void dirty_range_iterate_clear(MemRegion mr, MemRegionClosure* cl); | |
142 | |
143 // auxiliary support for iteration | |
144 HeapWord* getNextMarkedWordAddress(HeapWord* addr) const; | |
145 HeapWord* getNextMarkedWordAddress(HeapWord* start_addr, | |
146 HeapWord* end_addr) const; | |
147 HeapWord* getNextUnmarkedWordAddress(HeapWord* addr) const; | |
148 HeapWord* getNextUnmarkedWordAddress(HeapWord* start_addr, | |
149 HeapWord* end_addr) const; | |
150 MemRegion getAndClearMarkedRegion(HeapWord* addr); | |
151 MemRegion getAndClearMarkedRegion(HeapWord* start_addr, | |
152 HeapWord* end_addr); | |
153 | |
154 // conversion utilities | |
155 HeapWord* offsetToHeapWord(size_t offset) const; | |
156 size_t heapWordToOffset(HeapWord* addr) const; | |
157 size_t heapWordDiffToOffsetDiff(size_t diff) const; | |
158 | |
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159 void print_on_error(outputStream* st, const char* prefix) const; |
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160 |
0 | 161 // debugging |
162 // is this address range covered by the bit-map? | |
163 NOT_PRODUCT( | |
164 bool covers(MemRegion mr) const; | |
165 bool covers(HeapWord* start, size_t size = 0) const; | |
166 ) | |
167 void verifyNoOneBitsInRange(HeapWord* left, HeapWord* right) PRODUCT_RETURN; | |
168 }; | |
169 | |
170 // Represents a marking stack used by the CMS collector. | |
171 // Ideally this should be GrowableArray<> just like MSC's marking stack(s). | |
6197 | 172 class CMSMarkStack: public CHeapObj<mtGC> { |
0 | 173 // |
174 friend class CMSCollector; // to get at expasion stats further below | |
175 // | |
176 | |
177 VirtualSpace _virtual_space; // space for the stack | |
178 oop* _base; // bottom of stack | |
179 size_t _index; // one more than last occupied index | |
180 size_t _capacity; // max #elements | |
181 Mutex _par_lock; // an advisory lock used in case of parallel access | |
182 NOT_PRODUCT(size_t _max_depth;) // max depth plumbed during run | |
183 | |
184 protected: | |
185 size_t _hit_limit; // we hit max stack size limit | |
186 size_t _failed_double; // we failed expansion before hitting limit | |
187 | |
188 public: | |
189 CMSMarkStack(): | |
190 _par_lock(Mutex::event, "CMSMarkStack._par_lock", true), | |
191 _hit_limit(0), | |
192 _failed_double(0) {} | |
193 | |
194 bool allocate(size_t size); | |
195 | |
196 size_t capacity() const { return _capacity; } | |
197 | |
198 oop pop() { | |
199 if (!isEmpty()) { | |
200 return _base[--_index] ; | |
201 } | |
202 return NULL; | |
203 } | |
204 | |
205 bool push(oop ptr) { | |
206 if (isFull()) { | |
207 return false; | |
208 } else { | |
209 _base[_index++] = ptr; | |
210 NOT_PRODUCT(_max_depth = MAX2(_max_depth, _index)); | |
211 return true; | |
212 } | |
213 } | |
214 | |
215 bool isEmpty() const { return _index == 0; } | |
216 bool isFull() const { | |
217 assert(_index <= _capacity, "buffer overflow"); | |
218 return _index == _capacity; | |
219 } | |
220 | |
221 size_t length() { return _index; } | |
222 | |
223 // "Parallel versions" of some of the above | |
224 oop par_pop() { | |
225 // lock and pop | |
226 MutexLockerEx x(&_par_lock, Mutex::_no_safepoint_check_flag); | |
227 return pop(); | |
228 } | |
229 | |
230 bool par_push(oop ptr) { | |
231 // lock and push | |
232 MutexLockerEx x(&_par_lock, Mutex::_no_safepoint_check_flag); | |
233 return push(ptr); | |
234 } | |
235 | |
236 // Forcibly reset the stack, losing all of its contents. | |
237 void reset() { | |
238 _index = 0; | |
239 } | |
240 | |
241 // Expand the stack, typically in response to an overflow condition | |
242 void expand(); | |
243 | |
244 // Compute the least valued stack element. | |
245 oop least_value(HeapWord* low) { | |
246 oop least = (oop)low; | |
247 for (size_t i = 0; i < _index; i++) { | |
248 least = MIN2(least, _base[i]); | |
249 } | |
250 return least; | |
251 } | |
252 | |
253 // Exposed here to allow stack expansion in || case | |
254 Mutex* par_lock() { return &_par_lock; } | |
255 }; | |
256 | |
257 class CardTableRS; | |
258 class CMSParGCThreadState; | |
259 | |
260 class ModUnionClosure: public MemRegionClosure { | |
261 protected: | |
262 CMSBitMap* _t; | |
263 public: | |
264 ModUnionClosure(CMSBitMap* t): _t(t) { } | |
265 void do_MemRegion(MemRegion mr); | |
266 }; | |
267 | |
268 class ModUnionClosurePar: public ModUnionClosure { | |
269 public: | |
270 ModUnionClosurePar(CMSBitMap* t): ModUnionClosure(t) { } | |
271 void do_MemRegion(MemRegion mr); | |
272 }; | |
273 | |
274 // Survivor Chunk Array in support of parallelization of | |
275 // Survivor Space rescan. | |
6197 | 276 class ChunkArray: public CHeapObj<mtGC> { |
0 | 277 size_t _index; |
278 size_t _capacity; | |
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279 size_t _overflows; |
0 | 280 HeapWord** _array; // storage for array |
281 | |
282 public: | |
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283 ChunkArray() : _index(0), _capacity(0), _overflows(0), _array(NULL) {} |
0 | 284 ChunkArray(HeapWord** a, size_t c): |
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285 _index(0), _capacity(c), _overflows(0), _array(a) {} |
0 | 286 |
287 HeapWord** array() { return _array; } | |
288 void set_array(HeapWord** a) { _array = a; } | |
289 | |
290 size_t capacity() { return _capacity; } | |
291 void set_capacity(size_t c) { _capacity = c; } | |
292 | |
293 size_t end() { | |
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294 assert(_index <= capacity(), |
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295 err_msg("_index (" SIZE_FORMAT ") > _capacity (" SIZE_FORMAT "): out of bounds", |
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296 _index, _capacity)); |
0 | 297 return _index; |
298 } // exclusive | |
299 | |
300 HeapWord* nth(size_t n) { | |
301 assert(n < end(), "Out of bounds access"); | |
302 return _array[n]; | |
303 } | |
304 | |
305 void reset() { | |
306 _index = 0; | |
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307 if (_overflows > 0 && PrintCMSStatistics > 1) { |
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308 warning("CMS: ChunkArray[" SIZE_FORMAT "] overflowed " SIZE_FORMAT " times", |
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309 _capacity, _overflows); |
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310 } |
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311 _overflows = 0; |
0 | 312 } |
313 | |
314 void record_sample(HeapWord* p, size_t sz) { | |
315 // For now we do not do anything with the size | |
316 if (_index < _capacity) { | |
317 _array[_index++] = p; | |
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318 } else { |
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319 ++_overflows; |
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320 assert(_index == _capacity, |
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321 err_msg("_index (" SIZE_FORMAT ") > _capacity (" SIZE_FORMAT |
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322 "): out of bounds at overflow#" SIZE_FORMAT, |
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323 _index, _capacity, _overflows)); |
0 | 324 } |
325 } | |
326 }; | |
327 | |
328 // | |
329 // Timing, allocation and promotion statistics for gc scheduling and incremental | |
330 // mode pacing. Most statistics are exponential averages. | |
331 // | |
332 class CMSStats VALUE_OBJ_CLASS_SPEC { | |
333 private: | |
334 ConcurrentMarkSweepGeneration* const _cms_gen; // The cms (old) gen. | |
335 | |
336 // The following are exponential averages with factor alpha: | |
337 // avg = (100 - alpha) * avg + alpha * cur_sample | |
338 // | |
339 // The durations measure: end_time[n] - start_time[n] | |
340 // The periods measure: start_time[n] - start_time[n-1] | |
341 // | |
342 // The cms period and duration include only concurrent collections; time spent | |
343 // in foreground cms collections due to System.gc() or because of a failure to | |
344 // keep up are not included. | |
345 // | |
346 // There are 3 alphas to "bootstrap" the statistics. The _saved_alpha is the | |
347 // real value, but is used only after the first period. A value of 100 is | |
348 // used for the first sample so it gets the entire weight. | |
349 unsigned int _saved_alpha; // 0-100 | |
350 unsigned int _gc0_alpha; | |
351 unsigned int _cms_alpha; | |
352 | |
353 double _gc0_duration; | |
354 double _gc0_period; | |
355 size_t _gc0_promoted; // bytes promoted per gc0 | |
356 double _cms_duration; | |
357 double _cms_duration_pre_sweep; // time from initiation to start of sweep | |
358 double _cms_duration_per_mb; | |
359 double _cms_period; | |
360 size_t _cms_allocated; // bytes of direct allocation per gc0 period | |
361 | |
362 // Timers. | |
363 elapsedTimer _cms_timer; | |
364 TimeStamp _gc0_begin_time; | |
365 TimeStamp _cms_begin_time; | |
366 TimeStamp _cms_end_time; | |
367 | |
368 // Snapshots of the amount used in the CMS generation. | |
369 size_t _cms_used_at_gc0_begin; | |
370 size_t _cms_used_at_gc0_end; | |
371 size_t _cms_used_at_cms_begin; | |
372 | |
373 // Used to prevent the duty cycle from being reduced in the middle of a cms | |
374 // cycle. | |
375 bool _allow_duty_cycle_reduction; | |
376 | |
377 enum { | |
378 _GC0_VALID = 0x1, | |
379 _CMS_VALID = 0x2, | |
380 _ALL_VALID = _GC0_VALID | _CMS_VALID | |
381 }; | |
382 | |
383 unsigned int _valid_bits; | |
384 | |
385 unsigned int _icms_duty_cycle; // icms duty cycle (0-100). | |
386 | |
387 protected: | |
388 | |
389 // Return a duty cycle that avoids wild oscillations, by limiting the amount | |
390 // of change between old_duty_cycle and new_duty_cycle (the latter is treated | |
391 // as a recommended value). | |
392 static unsigned int icms_damped_duty_cycle(unsigned int old_duty_cycle, | |
393 unsigned int new_duty_cycle); | |
394 unsigned int icms_update_duty_cycle_impl(); | |
395 | |
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396 // In support of adjusting of cms trigger ratios based on history |
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397 // of concurrent mode failure. |
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398 double cms_free_adjustment_factor(size_t free) const; |
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399 void adjust_cms_free_adjustment_factor(bool fail, size_t free); |
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400 |
0 | 401 public: |
402 CMSStats(ConcurrentMarkSweepGeneration* cms_gen, | |
403 unsigned int alpha = CMSExpAvgFactor); | |
404 | |
405 // Whether or not the statistics contain valid data; higher level statistics | |
406 // cannot be called until this returns true (they require at least one young | |
407 // gen and one cms cycle to have completed). | |
408 bool valid() const; | |
409 | |
410 // Record statistics. | |
411 void record_gc0_begin(); | |
412 void record_gc0_end(size_t cms_gen_bytes_used); | |
413 void record_cms_begin(); | |
414 void record_cms_end(); | |
415 | |
416 // Allow management of the cms timer, which must be stopped/started around | |
417 // yield points. | |
418 elapsedTimer& cms_timer() { return _cms_timer; } | |
419 void start_cms_timer() { _cms_timer.start(); } | |
420 void stop_cms_timer() { _cms_timer.stop(); } | |
421 | |
422 // Basic statistics; units are seconds or bytes. | |
423 double gc0_period() const { return _gc0_period; } | |
424 double gc0_duration() const { return _gc0_duration; } | |
425 size_t gc0_promoted() const { return _gc0_promoted; } | |
426 double cms_period() const { return _cms_period; } | |
427 double cms_duration() const { return _cms_duration; } | |
428 double cms_duration_per_mb() const { return _cms_duration_per_mb; } | |
429 size_t cms_allocated() const { return _cms_allocated; } | |
430 | |
431 size_t cms_used_at_gc0_end() const { return _cms_used_at_gc0_end;} | |
432 | |
433 // Seconds since the last background cms cycle began or ended. | |
434 double cms_time_since_begin() const; | |
435 double cms_time_since_end() const; | |
436 | |
437 // Higher level statistics--caller must check that valid() returns true before | |
438 // calling. | |
439 | |
440 // Returns bytes promoted per second of wall clock time. | |
441 double promotion_rate() const; | |
442 | |
443 // Returns bytes directly allocated per second of wall clock time. | |
444 double cms_allocation_rate() const; | |
445 | |
446 // Rate at which space in the cms generation is being consumed (sum of the | |
447 // above two). | |
448 double cms_consumption_rate() const; | |
449 | |
450 // Returns an estimate of the number of seconds until the cms generation will | |
451 // fill up, assuming no collection work is done. | |
452 double time_until_cms_gen_full() const; | |
453 | |
454 // Returns an estimate of the number of seconds remaining until | |
455 // the cms generation collection should start. | |
456 double time_until_cms_start() const; | |
457 | |
458 // End of higher level statistics. | |
459 | |
460 // Returns the cms incremental mode duty cycle, as a percentage (0-100). | |
461 unsigned int icms_duty_cycle() const { return _icms_duty_cycle; } | |
462 | |
463 // Update the duty cycle and return the new value. | |
464 unsigned int icms_update_duty_cycle(); | |
465 | |
466 // Debugging. | |
467 void print_on(outputStream* st) const PRODUCT_RETURN; | |
468 void print() const { print_on(gclog_or_tty); } | |
469 }; | |
470 | |
471 // A closure related to weak references processing which | |
472 // we embed in the CMSCollector, since we need to pass | |
473 // it to the reference processor for secondary filtering | |
474 // of references based on reachability of referent; | |
475 // see role of _is_alive_non_header closure in the | |
476 // ReferenceProcessor class. | |
477 // For objects in the CMS generation, this closure checks | |
478 // if the object is "live" (reachable). Used in weak | |
479 // reference processing. | |
480 class CMSIsAliveClosure: public BoolObjectClosure { | |
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481 const MemRegion _span; |
0 | 482 const CMSBitMap* _bit_map; |
483 | |
484 friend class CMSCollector; | |
485 public: | |
486 CMSIsAliveClosure(MemRegion span, | |
487 CMSBitMap* bit_map): | |
488 _span(span), | |
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489 _bit_map(bit_map) { |
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490 assert(!span.is_empty(), "Empty span could spell trouble"); |
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491 } |
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492 |
0 | 493 bool do_object_b(oop obj); |
494 }; | |
495 | |
496 | |
497 // Implements AbstractRefProcTaskExecutor for CMS. | |
498 class CMSRefProcTaskExecutor: public AbstractRefProcTaskExecutor { | |
499 public: | |
500 | |
501 CMSRefProcTaskExecutor(CMSCollector& collector) | |
502 : _collector(collector) | |
503 { } | |
504 | |
505 // Executes a task using worker threads. | |
506 virtual void execute(ProcessTask& task); | |
507 virtual void execute(EnqueueTask& task); | |
508 private: | |
509 CMSCollector& _collector; | |
510 }; | |
511 | |
512 | |
6197 | 513 class CMSCollector: public CHeapObj<mtGC> { |
0 | 514 friend class VMStructs; |
515 friend class ConcurrentMarkSweepThread; | |
516 friend class ConcurrentMarkSweepGeneration; | |
517 friend class CompactibleFreeListSpace; | |
11975 | 518 friend class CMSParMarkTask; |
519 friend class CMSParInitialMarkTask; | |
0 | 520 friend class CMSParRemarkTask; |
521 friend class CMSConcMarkingTask; | |
522 friend class CMSRefProcTaskProxy; | |
523 friend class CMSRefProcTaskExecutor; | |
524 friend class ScanMarkedObjectsAgainCarefullyClosure; // for sampling eden | |
525 friend class SurvivorSpacePrecleanClosure; // --- ditto ------- | |
526 friend class PushOrMarkClosure; // to access _restart_addr | |
527 friend class Par_PushOrMarkClosure; // to access _restart_addr | |
528 friend class MarkFromRootsClosure; // -- ditto -- | |
529 // ... and for clearing cards | |
530 friend class Par_MarkFromRootsClosure; // to access _restart_addr | |
531 // ... and for clearing cards | |
532 friend class Par_ConcMarkingClosure; // to access _restart_addr etc. | |
533 friend class MarkFromRootsVerifyClosure; // to access _restart_addr | |
534 friend class PushAndMarkVerifyClosure; // -- ditto -- | |
535 friend class MarkRefsIntoAndScanClosure; // to access _overflow_list | |
536 friend class PushAndMarkClosure; // -- ditto -- | |
537 friend class Par_PushAndMarkClosure; // -- ditto -- | |
538 friend class CMSKeepAliveClosure; // -- ditto -- | |
539 friend class CMSDrainMarkingStackClosure; // -- ditto -- | |
540 friend class CMSInnerParMarkAndPushClosure; // -- ditto -- | |
541 NOT_PRODUCT(friend class ScanMarkedObjectsAgainClosure;) // assertion on _overflow_list | |
542 friend class ReleaseForegroundGC; // to access _foregroundGCShouldWait | |
543 friend class VM_CMS_Operation; | |
544 friend class VM_CMS_Initial_Mark; | |
545 friend class VM_CMS_Final_Remark; | |
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546 friend class TraceCMSMemoryManagerStats; |
0 | 547 |
548 private: | |
549 jlong _time_of_last_gc; | |
550 void update_time_of_last_gc(jlong now) { | |
551 _time_of_last_gc = now; | |
552 } | |
553 | |
554 OopTaskQueueSet* _task_queues; | |
555 | |
556 // Overflow list of grey objects, threaded through mark-word | |
557 // Manipulated with CAS in the parallel/multi-threaded case. | |
558 oop _overflow_list; | |
559 // The following array-pair keeps track of mark words | |
560 // displaced for accomodating overflow list above. | |
561 // This code will likely be revisited under RFE#4922830. | |
6197 | 562 Stack<oop, mtGC> _preserved_oop_stack; |
563 Stack<markOop, mtGC> _preserved_mark_stack; | |
0 | 564 |
565 int* _hash_seed; | |
566 | |
567 // In support of multi-threaded concurrent phases | |
568 YieldingFlexibleWorkGang* _conc_workers; | |
569 | |
570 // Performance Counters | |
571 CollectorCounters* _gc_counters; | |
572 | |
573 // Initialization Errors | |
574 bool _completed_initialization; | |
575 | |
576 // In support of ExplicitGCInvokesConcurrent | |
10405 | 577 static bool _full_gc_requested; |
578 static GCCause::Cause _full_gc_cause; | |
579 unsigned int _collection_count_start; | |
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580 |
0 | 581 // Should we unload classes this concurrent cycle? |
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582 bool _should_unload_classes; |
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583 unsigned int _concurrent_cycles_since_last_unload; |
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584 unsigned int concurrent_cycles_since_last_unload() const { |
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585 return _concurrent_cycles_since_last_unload; |
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586 } |
0 | 587 // Did we (allow) unload classes in the previous concurrent cycle? |
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588 bool unloaded_classes_last_cycle() const { |
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589 return concurrent_cycles_since_last_unload() == 0; |
0 | 590 } |
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591 // Root scanning options for perm gen |
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592 int _roots_scanning_options; |
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593 int roots_scanning_options() const { return _roots_scanning_options; } |
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594 void add_root_scanning_option(int o) { _roots_scanning_options |= o; } |
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595 void remove_root_scanning_option(int o) { _roots_scanning_options &= ~o; } |
0 | 596 |
597 // Verification support | |
598 CMSBitMap _verification_mark_bm; | |
599 void verify_after_remark_work_1(); | |
600 void verify_after_remark_work_2(); | |
601 | |
602 // true if any verification flag is on. | |
603 bool _verifying; | |
604 bool verifying() const { return _verifying; } | |
605 void set_verifying(bool v) { _verifying = v; } | |
606 | |
607 // Collector policy | |
608 ConcurrentMarkSweepPolicy* _collector_policy; | |
609 ConcurrentMarkSweepPolicy* collector_policy() { return _collector_policy; } | |
610 | |
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611 void set_did_compact(bool v); |
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612 |
0 | 613 // XXX Move these to CMSStats ??? FIX ME !!! |
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614 elapsedTimer _inter_sweep_timer; // time between sweeps |
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615 elapsedTimer _intra_sweep_timer; // time _in_ sweeps |
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616 // padded decaying average estimates of the above |
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617 AdaptivePaddedAverage _inter_sweep_estimate; |
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618 AdaptivePaddedAverage _intra_sweep_estimate; |
0 | 619 |
10405 | 620 CMSTracer* _gc_tracer_cm; |
621 ConcurrentGCTimer* _gc_timer_cm; | |
622 | |
623 bool _cms_start_registered; | |
624 | |
625 GCHeapSummary _last_heap_summary; | |
626 MetaspaceSummary _last_metaspace_summary; | |
627 | |
628 void register_foreground_gc_start(GCCause::Cause cause); | |
629 void register_gc_start(GCCause::Cause cause); | |
630 void register_gc_end(); | |
631 void save_heap_summary(); | |
632 void report_heap_summary(GCWhen::Type when); | |
633 | |
0 | 634 protected: |
635 ConcurrentMarkSweepGeneration* _cmsGen; // old gen (CMS) | |
636 MemRegion _span; // span covering above two | |
637 CardTableRS* _ct; // card table | |
638 | |
639 // CMS marking support structures | |
640 CMSBitMap _markBitMap; | |
641 CMSBitMap _modUnionTable; | |
642 CMSMarkStack _markStack; | |
643 | |
644 HeapWord* _restart_addr; // in support of marking stack overflow | |
645 void lower_restart_addr(HeapWord* low); | |
646 | |
647 // Counters in support of marking stack / work queue overflow handling: | |
648 // a non-zero value indicates certain types of overflow events during | |
649 // the current CMS cycle and could lead to stack resizing efforts at | |
650 // an opportune future time. | |
651 size_t _ser_pmc_preclean_ovflw; | |
652 size_t _ser_pmc_remark_ovflw; | |
653 size_t _par_pmc_remark_ovflw; | |
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654 size_t _ser_kac_preclean_ovflw; |
0 | 655 size_t _ser_kac_ovflw; |
656 size_t _par_kac_ovflw; | |
534 | 657 NOT_PRODUCT(ssize_t _num_par_pushes;) |
0 | 658 |
659 // ("Weak") Reference processing support | |
660 ReferenceProcessor* _ref_processor; | |
661 CMSIsAliveClosure _is_alive_closure; | |
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662 // keep this textually after _markBitMap and _span; c'tor dependency |
0 | 663 |
664 ConcurrentMarkSweepThread* _cmsThread; // the thread doing the work | |
665 ModUnionClosure _modUnionClosure; | |
666 ModUnionClosurePar _modUnionClosurePar; | |
667 | |
668 // CMS abstract state machine | |
669 // initial_state: Idling | |
670 // next_state(Idling) = {Marking} | |
671 // next_state(Marking) = {Precleaning, Sweeping} | |
672 // next_state(Precleaning) = {AbortablePreclean, FinalMarking} | |
673 // next_state(AbortablePreclean) = {FinalMarking} | |
674 // next_state(FinalMarking) = {Sweeping} | |
675 // next_state(Sweeping) = {Resizing} | |
676 // next_state(Resizing) = {Resetting} | |
677 // next_state(Resetting) = {Idling} | |
678 // The numeric values below are chosen so that: | |
679 // . _collectorState <= Idling == post-sweep && pre-mark | |
680 // . _collectorState in (Idling, Sweeping) == {initial,final}marking || | |
681 // precleaning || abortablePrecleanb | |
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682 public: |
0 | 683 enum CollectorState { |
684 Resizing = 0, | |
685 Resetting = 1, | |
686 Idling = 2, | |
687 InitialMarking = 3, | |
688 Marking = 4, | |
689 Precleaning = 5, | |
690 AbortablePreclean = 6, | |
691 FinalMarking = 7, | |
692 Sweeping = 8 | |
693 }; | |
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694 protected: |
0 | 695 static CollectorState _collectorState; |
696 | |
697 // State related to prologue/epilogue invocation for my generations | |
698 bool _between_prologue_and_epilogue; | |
699 | |
700 // Signalling/State related to coordination between fore- and backgroud GC | |
701 // Note: When the baton has been passed from background GC to foreground GC, | |
702 // _foregroundGCIsActive is true and _foregroundGCShouldWait is false. | |
703 static bool _foregroundGCIsActive; // true iff foreground collector is active or | |
704 // wants to go active | |
705 static bool _foregroundGCShouldWait; // true iff background GC is active and has not | |
706 // yet passed the baton to the foreground GC | |
707 | |
708 // Support for CMSScheduleRemark (abortable preclean) | |
709 bool _abort_preclean; | |
710 bool _start_sampling; | |
711 | |
712 int _numYields; | |
713 size_t _numDirtyCards; | |
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714 size_t _sweep_count; |
0 | 715 // number of full gc's since the last concurrent gc. |
716 uint _full_gcs_since_conc_gc; | |
717 | |
718 // occupancy used for bootstrapping stats | |
719 double _bootstrap_occupancy; | |
720 | |
721 // timer | |
722 elapsedTimer _timer; | |
723 | |
724 // Timing, allocation and promotion statistics, used for scheduling. | |
725 CMSStats _stats; | |
726 | |
727 // Allocation limits installed in the young gen, used only in | |
728 // CMSIncrementalMode. When an allocation in the young gen would cross one of | |
729 // these limits, the cms generation is notified and the cms thread is started | |
730 // or stopped, respectively. | |
731 HeapWord* _icms_start_limit; | |
732 HeapWord* _icms_stop_limit; | |
733 | |
734 enum CMS_op_type { | |
735 CMS_op_checkpointRootsInitial, | |
736 CMS_op_checkpointRootsFinal | |
737 }; | |
738 | |
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739 void do_CMS_operation(CMS_op_type op, GCCause::Cause gc_cause); |
0 | 740 bool stop_world_and_do(CMS_op_type op); |
741 | |
742 OopTaskQueueSet* task_queues() { return _task_queues; } | |
743 int* hash_seed(int i) { return &_hash_seed[i]; } | |
744 YieldingFlexibleWorkGang* conc_workers() { return _conc_workers; } | |
745 | |
746 // Support for parallelizing Eden rescan in CMS remark phase | |
747 void sample_eden(); // ... sample Eden space top | |
748 | |
749 private: | |
750 // Support for parallelizing young gen rescan in CMS remark phase | |
751 Generation* _young_gen; // the younger gen | |
752 HeapWord** _top_addr; // ... Top of Eden | |
753 HeapWord** _end_addr; // ... End of Eden | |
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754 Mutex* _eden_chunk_lock; |
0 | 755 HeapWord** _eden_chunk_array; // ... Eden partitioning array |
756 size_t _eden_chunk_index; // ... top (exclusive) of array | |
757 size_t _eden_chunk_capacity; // ... max entries in array | |
758 | |
759 // Support for parallelizing survivor space rescan | |
760 HeapWord** _survivor_chunk_array; | |
761 size_t _survivor_chunk_index; | |
762 size_t _survivor_chunk_capacity; | |
763 size_t* _cursor; | |
764 ChunkArray* _survivor_plab_array; | |
765 | |
766 // Support for marking stack overflow handling | |
767 bool take_from_overflow_list(size_t num, CMSMarkStack* to_stack); | |
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768 bool par_take_from_overflow_list(size_t num, |
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769 OopTaskQueue* to_work_q, |
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770 int no_of_gc_threads); |
0 | 771 void push_on_overflow_list(oop p); |
772 void par_push_on_overflow_list(oop p); | |
773 // the following is, obviously, not, in general, "MT-stable" | |
774 bool overflow_list_is_empty() const; | |
775 | |
776 void preserve_mark_if_necessary(oop p); | |
777 void par_preserve_mark_if_necessary(oop p); | |
778 void preserve_mark_work(oop p, markOop m); | |
779 void restore_preserved_marks_if_any(); | |
780 NOT_PRODUCT(bool no_preserved_marks() const;) | |
781 // in support of testing overflow code | |
782 NOT_PRODUCT(int _overflow_counter;) | |
783 NOT_PRODUCT(bool simulate_overflow();) // sequential | |
784 NOT_PRODUCT(bool par_simulate_overflow();) // MT version | |
785 | |
786 // CMS work methods | |
787 void checkpointRootsInitialWork(bool asynch); // initial checkpoint work | |
788 | |
789 // a return value of false indicates failure due to stack overflow | |
790 bool markFromRootsWork(bool asynch); // concurrent marking work | |
791 | |
792 public: // FIX ME!!! only for testing | |
793 bool do_marking_st(bool asynch); // single-threaded marking | |
794 bool do_marking_mt(bool asynch); // multi-threaded marking | |
795 | |
796 private: | |
797 | |
798 // concurrent precleaning work | |
799 size_t preclean_mod_union_table(ConcurrentMarkSweepGeneration* gen, | |
800 ScanMarkedObjectsAgainCarefullyClosure* cl); | |
801 size_t preclean_card_table(ConcurrentMarkSweepGeneration* gen, | |
802 ScanMarkedObjectsAgainCarefullyClosure* cl); | |
803 // Does precleaning work, returning a quantity indicative of | |
804 // the amount of "useful work" done. | |
805 size_t preclean_work(bool clean_refs, bool clean_survivors); | |
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806 void preclean_klasses(MarkRefsIntoAndScanClosure* cl, Mutex* freelistLock); |
0 | 807 void abortable_preclean(); // Preclean while looking for possible abort |
808 void initialize_sequential_subtasks_for_young_gen_rescan(int i); | |
809 // Helper function for above; merge-sorts the per-thread plab samples | |
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810 void merge_survivor_plab_arrays(ContiguousSpace* surv, int no_of_gc_threads); |
0 | 811 // Resets (i.e. clears) the per-thread plab sample vectors |
812 void reset_survivor_plab_arrays(); | |
813 | |
814 // final (second) checkpoint work | |
815 void checkpointRootsFinalWork(bool asynch, bool clear_all_soft_refs, | |
816 bool init_mark_was_synchronous); | |
817 // work routine for parallel version of remark | |
818 void do_remark_parallel(); | |
819 // work routine for non-parallel version of remark | |
820 void do_remark_non_parallel(); | |
821 // reference processing work routine (during second checkpoint) | |
822 void refProcessingWork(bool asynch, bool clear_all_soft_refs); | |
823 | |
824 // concurrent sweeping work | |
825 void sweepWork(ConcurrentMarkSweepGeneration* gen, bool asynch); | |
826 | |
827 // (concurrent) resetting of support data structures | |
828 void reset(bool asynch); | |
829 | |
830 // Clear _expansion_cause fields of constituent generations | |
831 void clear_expansion_cause(); | |
832 | |
833 // An auxilliary method used to record the ends of | |
834 // used regions of each generation to limit the extent of sweep | |
835 void save_sweep_limits(); | |
836 | |
837 // A work method used by foreground collection to determine | |
838 // what type of collection (compacting or not, continuing or fresh) | |
839 // it should do. | |
840 void decide_foreground_collection_type(bool clear_all_soft_refs, | |
841 bool* should_compact, bool* should_start_over); | |
842 | |
843 // A work method used by the foreground collector to do | |
844 // a mark-sweep-compact. | |
845 void do_compaction_work(bool clear_all_soft_refs); | |
846 | |
847 // A work method used by the foreground collector to do | |
848 // a mark-sweep, after taking over from a possibly on-going | |
849 // concurrent mark-sweep collection. | |
850 void do_mark_sweep_work(bool clear_all_soft_refs, | |
851 CollectorState first_state, bool should_start_over); | |
852 | |
10405 | 853 // Work methods for reporting concurrent mode interruption or failure |
854 bool is_external_interruption(); | |
855 void report_concurrent_mode_interruption(); | |
856 | |
0 | 857 // If the backgrould GC is active, acquire control from the background |
858 // GC and do the collection. | |
859 void acquire_control_and_collect(bool full, bool clear_all_soft_refs); | |
860 | |
861 // For synchronizing passing of control from background to foreground | |
862 // GC. waitForForegroundGC() is called by the background | |
863 // collector. It if had to wait for a foreground collection, | |
864 // it returns true and the background collection should assume | |
865 // that the collection was finished by the foreground | |
866 // collector. | |
867 bool waitForForegroundGC(); | |
868 | |
869 // Incremental mode triggering: recompute the icms duty cycle and set the | |
870 // allocation limits in the young gen. | |
871 void icms_update_allocation_limits(); | |
872 | |
873 size_t block_size_using_printezis_bits(HeapWord* addr) const; | |
874 size_t block_size_if_printezis_bits(HeapWord* addr) const; | |
875 HeapWord* next_card_start_after_block(HeapWord* addr) const; | |
876 | |
877 void setup_cms_unloading_and_verification_state(); | |
878 public: | |
879 CMSCollector(ConcurrentMarkSweepGeneration* cmsGen, | |
880 CardTableRS* ct, | |
881 ConcurrentMarkSweepPolicy* cp); | |
882 ConcurrentMarkSweepThread* cmsThread() { return _cmsThread; } | |
883 | |
884 ReferenceProcessor* ref_processor() { return _ref_processor; } | |
885 void ref_processor_init(); | |
886 | |
887 Mutex* bitMapLock() const { return _markBitMap.lock(); } | |
888 static CollectorState abstract_state() { return _collectorState; } | |
889 | |
890 bool should_abort_preclean() const; // Whether preclean should be aborted. | |
891 size_t get_eden_used() const; | |
892 size_t get_eden_capacity() const; | |
893 | |
894 ConcurrentMarkSweepGeneration* cmsGen() { return _cmsGen; } | |
895 | |
896 // locking checks | |
897 NOT_PRODUCT(static bool have_cms_token();) | |
898 | |
899 // XXXPERM bool should_collect(bool full, size_t size, bool tlab); | |
900 bool shouldConcurrentCollect(); | |
901 | |
902 void collect(bool full, | |
903 bool clear_all_soft_refs, | |
904 size_t size, | |
905 bool tlab); | |
10405 | 906 void collect_in_background(bool clear_all_soft_refs, GCCause::Cause cause); |
907 void collect_in_foreground(bool clear_all_soft_refs, GCCause::Cause cause); | |
0 | 908 |
909 // In support of ExplicitGCInvokesConcurrent | |
10405 | 910 static void request_full_gc(unsigned int full_gc_count, GCCause::Cause cause); |
0 | 911 // Should we unload classes in a particular concurrent cycle? |
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912 bool should_unload_classes() const { |
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913 return _should_unload_classes; |
0 | 914 } |
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915 void update_should_unload_classes(); |
0 | 916 |
917 void direct_allocated(HeapWord* start, size_t size); | |
918 | |
919 // Object is dead if not marked and current phase is sweeping. | |
920 bool is_dead_obj(oop obj) const; | |
921 | |
922 // After a promotion (of "start"), do any necessary marking. | |
923 // If "par", then it's being done by a parallel GC thread. | |
924 // The last two args indicate if we need precise marking | |
925 // and if so the size of the object so it can be dirtied | |
926 // in its entirety. | |
927 void promoted(bool par, HeapWord* start, | |
928 bool is_obj_array, size_t obj_size); | |
929 | |
930 HeapWord* allocation_limit_reached(Space* space, HeapWord* top, | |
931 size_t word_size); | |
932 | |
933 void getFreelistLocks() const; | |
934 void releaseFreelistLocks() const; | |
935 bool haveFreelistLocks() const; | |
936 | |
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937 // Adjust size of underlying generation |
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938 void compute_new_size(); |
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939 |
0 | 940 // GC prologue and epilogue |
941 void gc_prologue(bool full); | |
942 void gc_epilogue(bool full); | |
943 | |
944 jlong time_of_last_gc(jlong now) { | |
945 if (_collectorState <= Idling) { | |
946 // gc not in progress | |
947 return _time_of_last_gc; | |
948 } else { | |
949 // collection in progress | |
950 return now; | |
951 } | |
952 } | |
953 | |
954 // Support for parallel remark of survivor space | |
955 void* get_data_recorder(int thr_num); | |
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956 void sample_eden_chunk(); |
0 | 957 |
958 CMSBitMap* markBitMap() { return &_markBitMap; } | |
959 void directAllocated(HeapWord* start, size_t size); | |
960 | |
961 // main CMS steps and related support | |
962 void checkpointRootsInitial(bool asynch); | |
963 bool markFromRoots(bool asynch); // a return value of false indicates failure | |
964 // due to stack overflow | |
965 void preclean(); | |
966 void checkpointRootsFinal(bool asynch, bool clear_all_soft_refs, | |
967 bool init_mark_was_synchronous); | |
968 void sweep(bool asynch); | |
969 | |
970 // Check that the currently executing thread is the expected | |
971 // one (foreground collector or background collector). | |
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972 static void check_correct_thread_executing() PRODUCT_RETURN; |
0 | 973 // XXXPERM void print_statistics() PRODUCT_RETURN; |
974 | |
975 bool is_cms_reachable(HeapWord* addr); | |
976 | |
977 // Performance Counter Support | |
978 CollectorCounters* counters() { return _gc_counters; } | |
979 | |
980 // timer stuff | |
981 void startTimer() { assert(!_timer.is_active(), "Error"); _timer.start(); } | |
982 void stopTimer() { assert( _timer.is_active(), "Error"); _timer.stop(); } | |
983 void resetTimer() { assert(!_timer.is_active(), "Error"); _timer.reset(); } | |
984 double timerValue() { assert(!_timer.is_active(), "Error"); return _timer.seconds(); } | |
985 | |
986 int yields() { return _numYields; } | |
987 void resetYields() { _numYields = 0; } | |
988 void incrementYields() { _numYields++; } | |
989 void resetNumDirtyCards() { _numDirtyCards = 0; } | |
990 void incrementNumDirtyCards(size_t num) { _numDirtyCards += num; } | |
991 size_t numDirtyCards() { return _numDirtyCards; } | |
992 | |
993 static bool foregroundGCShouldWait() { return _foregroundGCShouldWait; } | |
994 static void set_foregroundGCShouldWait(bool v) { _foregroundGCShouldWait = v; } | |
995 static bool foregroundGCIsActive() { return _foregroundGCIsActive; } | |
996 static void set_foregroundGCIsActive(bool v) { _foregroundGCIsActive = v; } | |
1145
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997 size_t sweep_count() const { return _sweep_count; } |
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998 void increment_sweep_count() { _sweep_count++; } |
0 | 999 |
1000 // Timers/stats for gc scheduling and incremental mode pacing. | |
1001 CMSStats& stats() { return _stats; } | |
1002 | |
1003 // Convenience methods that check whether CMSIncrementalMode is enabled and | |
1004 // forward to the corresponding methods in ConcurrentMarkSweepThread. | |
1005 static void start_icms(); | |
1006 static void stop_icms(); // Called at the end of the cms cycle. | |
1007 static void disable_icms(); // Called before a foreground collection. | |
1008 static void enable_icms(); // Called after a foreground collection. | |
1009 void icms_wait(); // Called at yield points. | |
1010 | |
1011 // Adaptive size policy | |
1012 CMSAdaptiveSizePolicy* size_policy(); | |
1013 CMSGCAdaptivePolicyCounters* gc_adaptive_policy_counters(); | |
1014 | |
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1015 static void print_on_error(outputStream* st); |
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1016 |
0 | 1017 // debugging |
6008 | 1018 void verify(); |
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1019 bool verify_after_remark(bool silent = VerifySilently); |
0 | 1020 void verify_ok_to_terminate() const PRODUCT_RETURN; |
1021 void verify_work_stacks_empty() const PRODUCT_RETURN; | |
1022 void verify_overflow_empty() const PRODUCT_RETURN; | |
1023 | |
1024 // convenience methods in support of debugging | |
1025 static const size_t skip_header_HeapWords() PRODUCT_RETURN0; | |
1026 HeapWord* block_start(const void* p) const PRODUCT_RETURN0; | |
1027 | |
1028 // accessors | |
1029 CMSMarkStack* verification_mark_stack() { return &_markStack; } | |
1030 CMSBitMap* verification_mark_bm() { return &_verification_mark_bm; } | |
1031 | |
1032 // Initialization errors | |
1033 bool completed_initialization() { return _completed_initialization; } | |
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1034 |
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1035 void print_eden_and_survivor_chunk_arrays(); |
0 | 1036 }; |
1037 | |
1038 class CMSExpansionCause : public AllStatic { | |
1039 public: | |
1040 enum Cause { | |
1041 _no_expansion, | |
1042 _satisfy_free_ratio, | |
1043 _satisfy_promotion, | |
1044 _satisfy_allocation, | |
1045 _allocate_par_lab, | |
1046 _allocate_par_spooling_space, | |
1047 _adaptive_size_policy | |
1048 }; | |
1049 // Return a string describing the cause of the expansion. | |
1050 static const char* to_string(CMSExpansionCause::Cause cause); | |
1051 }; | |
1052 | |
1053 class ConcurrentMarkSweepGeneration: public CardGeneration { | |
1054 friend class VMStructs; | |
1055 friend class ConcurrentMarkSweepThread; | |
1056 friend class ConcurrentMarkSweep; | |
1057 friend class CMSCollector; | |
1058 protected: | |
1059 static CMSCollector* _collector; // the collector that collects us | |
1060 CompactibleFreeListSpace* _cmsSpace; // underlying space (only one for now) | |
1061 | |
1062 // Performance Counters | |
1063 GenerationCounters* _gen_counters; | |
1064 GSpaceCounters* _space_counters; | |
1065 | |
1066 // Words directly allocated, used by CMSStats. | |
1067 size_t _direct_allocated_words; | |
1068 | |
1069 // Non-product stat counters | |
1070 NOT_PRODUCT( | |
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1071 size_t _numObjectsPromoted; |
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1072 size_t _numWordsPromoted; |
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1073 size_t _numObjectsAllocated; |
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1074 size_t _numWordsAllocated; |
0 | 1075 ) |
1076 | |
1077 // Used for sizing decisions | |
1078 bool _incremental_collection_failed; | |
1079 bool incremental_collection_failed() { | |
1080 return _incremental_collection_failed; | |
1081 } | |
1082 void set_incremental_collection_failed() { | |
1083 _incremental_collection_failed = true; | |
1084 } | |
1085 void clear_incremental_collection_failed() { | |
1086 _incremental_collection_failed = false; | |
1087 } | |
1088 | |
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1089 // accessors |
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1090 void set_expansion_cause(CMSExpansionCause::Cause v) { _expansion_cause = v;} |
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1091 CMSExpansionCause::Cause expansion_cause() const { return _expansion_cause; } |
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1092 |
0 | 1093 private: |
1094 // For parallel young-gen GC support. | |
1095 CMSParGCThreadState** _par_gc_thread_states; | |
1096 | |
1097 // Reason generation was expanded | |
1098 CMSExpansionCause::Cause _expansion_cause; | |
1099 | |
1100 // In support of MinChunkSize being larger than min object size | |
1101 const double _dilatation_factor; | |
1102 | |
1103 enum CollectionTypes { | |
1104 Concurrent_collection_type = 0, | |
1105 MS_foreground_collection_type = 1, | |
1106 MSC_foreground_collection_type = 2, | |
1107 Unknown_collection_type = 3 | |
1108 }; | |
1109 | |
1110 CollectionTypes _debug_collection_type; | |
1111 | |
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1112 // True if a compactiing collection was done. |
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1113 bool _did_compact; |
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1114 bool did_compact() { return _did_compact; } |
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1115 |
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1116 // Fraction of current occupancy at which to start a CMS collection which |
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1117 // will collect this generation (at least). |
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1118 double _initiating_occupancy; |
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1119 |
0 | 1120 protected: |
1121 // Shrink generation by specified size (returns false if unable to shrink) | |
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1122 void shrink_free_list_by(size_t bytes); |
0 | 1123 |
1124 // Update statistics for GC | |
1125 virtual void update_gc_stats(int level, bool full); | |
1126 | |
1127 // Maximum available space in the generation (including uncommitted) | |
1128 // space. | |
1129 size_t max_available() const; | |
1130 | |
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1131 // getter and initializer for _initiating_occupancy field. |
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1132 double initiating_occupancy() const { return _initiating_occupancy; } |
8035 | 1133 void init_initiating_occupancy(intx io, uintx tr); |
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1134 |
0 | 1135 public: |
1136 ConcurrentMarkSweepGeneration(ReservedSpace rs, size_t initial_byte_size, | |
1137 int level, CardTableRS* ct, | |
1138 bool use_adaptive_freelists, | |
6026 | 1139 FreeBlockDictionary<FreeChunk>::DictionaryChoice); |
0 | 1140 |
1141 // Accessors | |
1142 CMSCollector* collector() const { return _collector; } | |
1143 static void set_collector(CMSCollector* collector) { | |
1144 assert(_collector == NULL, "already set"); | |
1145 _collector = collector; | |
1146 } | |
1147 CompactibleFreeListSpace* cmsSpace() const { return _cmsSpace; } | |
1148 | |
1149 Mutex* freelistLock() const; | |
1150 | |
1151 virtual Generation::Name kind() { return Generation::ConcurrentMarkSweep; } | |
1152 | |
1153 // Adaptive size policy | |
1154 CMSAdaptiveSizePolicy* size_policy(); | |
1155 | |
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1156 void set_did_compact(bool v) { _did_compact = v; } |
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1157 |
0 | 1158 bool refs_discovery_is_atomic() const { return false; } |
1159 bool refs_discovery_is_mt() const { | |
1160 // Note: CMS does MT-discovery during the parallel-remark | |
1161 // phases. Use ReferenceProcessorMTMutator to make refs | |
1162 // discovery MT-safe during such phases or other parallel | |
1163 // discovery phases in the future. This may all go away | |
1164 // if/when we decide that refs discovery is sufficiently | |
1165 // rare that the cost of the CAS's involved is in the | |
1166 // noise. That's a measurement that should be done, and | |
1167 // the code simplified if that turns out to be the case. | |
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1168 return ConcGCThreads > 1; |
0 | 1169 } |
1170 | |
1171 // Override | |
1172 virtual void ref_processor_init(); | |
1173 | |
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1174 // Grow generation by specified size (returns false if unable to grow) |
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1175 bool grow_by(size_t bytes); |
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1176 // Grow generation to reserved size. |
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1177 bool grow_to_reserved(); |
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1178 |
0 | 1179 void clear_expansion_cause() { _expansion_cause = CMSExpansionCause::_no_expansion; } |
1180 | |
1181 // Space enquiries | |
1182 size_t capacity() const; | |
1183 size_t used() const; | |
1184 size_t free() const; | |
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1185 double occupancy() const { return ((double)used())/((double)capacity()); } |
0 | 1186 size_t contiguous_available() const; |
1187 size_t unsafe_max_alloc_nogc() const; | |
1188 | |
1189 // over-rides | |
1190 MemRegion used_region() const; | |
1191 MemRegion used_region_at_save_marks() const; | |
1192 | |
1193 // Does a "full" (forced) collection invoked on this generation collect | |
1194 // all younger generations as well? Note that the second conjunct is a | |
1195 // hack to allow the collection of the younger gen first if the flag is | |
1196 // set. This is better than using th policy's should_collect_gen0_first() | |
1197 // since that causes us to do an extra unnecessary pair of restart-&-stop-world. | |
1198 virtual bool full_collects_younger_generations() const { | |
1199 return UseCMSCompactAtFullCollection && !CollectGen0First; | |
1200 } | |
1201 | |
1202 void space_iterate(SpaceClosure* blk, bool usedOnly = false); | |
1203 | |
1204 // Support for compaction | |
1205 CompactibleSpace* first_compaction_space() const; | |
1206 // Adjust quantites in the generation affected by | |
1207 // the compaction. | |
1208 void reset_after_compaction(); | |
1209 | |
1210 // Allocation support | |
1211 HeapWord* allocate(size_t size, bool tlab); | |
1212 HeapWord* have_lock_and_allocate(size_t size, bool tlab); | |
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1213 oop promote(oop obj, size_t obj_size); |
0 | 1214 HeapWord* par_allocate(size_t size, bool tlab) { |
1215 return allocate(size, tlab); | |
1216 } | |
1217 | |
1218 // Incremental mode triggering. | |
1219 HeapWord* allocation_limit_reached(Space* space, HeapWord* top, | |
1220 size_t word_size); | |
1221 | |
1222 // Used by CMSStats to track direct allocation. The value is sampled and | |
1223 // reset after each young gen collection. | |
1224 size_t direct_allocated_words() const { return _direct_allocated_words; } | |
1225 void reset_direct_allocated_words() { _direct_allocated_words = 0; } | |
1226 | |
1227 // Overrides for parallel promotion. | |
1228 virtual oop par_promote(int thread_num, | |
1229 oop obj, markOop m, size_t word_sz); | |
1230 // This one should not be called for CMS. | |
1231 virtual void par_promote_alloc_undo(int thread_num, | |
1232 HeapWord* obj, size_t word_sz); | |
1233 virtual void par_promote_alloc_done(int thread_num); | |
1234 virtual void par_oop_since_save_marks_iterate_done(int thread_num); | |
1235 | |
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1236 virtual bool promotion_attempt_is_safe(size_t promotion_in_bytes) const; |
0 | 1237 |
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1238 // Inform this (non-young) generation that a promotion failure was |
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1239 // encountered during a collection of a younger generation that |
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1240 // promotes into this generation. |
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1241 virtual void promotion_failure_occurred(); |
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1242 |
0 | 1243 bool should_collect(bool full, size_t size, bool tlab); |
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1244 virtual bool should_concurrent_collect() const; |
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1245 virtual bool is_too_full() const; |
0 | 1246 void collect(bool full, |
1247 bool clear_all_soft_refs, | |
1248 size_t size, | |
1249 bool tlab); | |
1250 | |
1251 HeapWord* expand_and_allocate(size_t word_size, | |
1252 bool tlab, | |
1253 bool parallel = false); | |
1254 | |
1255 // GC prologue and epilogue | |
1256 void gc_prologue(bool full); | |
1257 void gc_prologue_work(bool full, bool registerClosure, | |
1258 ModUnionClosure* modUnionClosure); | |
1259 void gc_epilogue(bool full); | |
1260 void gc_epilogue_work(bool full); | |
1261 | |
1262 // Time since last GC of this generation | |
1263 jlong time_of_last_gc(jlong now) { | |
1264 return collector()->time_of_last_gc(now); | |
1265 } | |
1266 void update_time_of_last_gc(jlong now) { | |
1267 collector()-> update_time_of_last_gc(now); | |
1268 } | |
1269 | |
1270 // Allocation failure | |
1271 void expand(size_t bytes, size_t expand_bytes, | |
1272 CMSExpansionCause::Cause cause); | |
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1273 virtual bool expand(size_t bytes, size_t expand_bytes); |
0 | 1274 void shrink(size_t bytes); |
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1275 void shrink_by(size_t bytes); |
0 | 1276 HeapWord* expand_and_par_lab_allocate(CMSParGCThreadState* ps, size_t word_sz); |
1277 bool expand_and_ensure_spooling_space(PromotionInfo* promo); | |
1278 | |
1279 // Iteration support and related enquiries | |
1280 void save_marks(); | |
1281 bool no_allocs_since_save_marks(); | |
1282 void younger_refs_iterate(OopsInGenClosure* cl); | |
1283 | |
1284 // Iteration support specific to CMS generations | |
1285 void save_sweep_limit(); | |
1286 | |
1287 // More iteration support | |
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1288 virtual void oop_iterate(MemRegion mr, ExtendedOopClosure* cl); |
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1289 virtual void oop_iterate(ExtendedOopClosure* cl); |
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1290 virtual void safe_object_iterate(ObjectClosure* cl); |
0 | 1291 virtual void object_iterate(ObjectClosure* cl); |
1292 | |
1293 // Need to declare the full complement of closures, whether we'll | |
1294 // override them or not, or get message from the compiler: | |
1295 // oop_since_save_marks_iterate_nv hides virtual function... | |
1296 #define CMS_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \ | |
1297 void oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl); | |
1298 ALL_SINCE_SAVE_MARKS_CLOSURES(CMS_SINCE_SAVE_MARKS_DECL) | |
1299 | |
1300 // Smart allocation XXX -- move to CFLSpace? | |
1301 void setNearLargestChunk(); | |
1302 bool isNearLargestChunk(HeapWord* addr); | |
1303 | |
1304 // Get the chunk at the end of the space. Delagates to | |
1305 // the space. | |
1306 FreeChunk* find_chunk_at_end(); | |
1307 | |
1308 void post_compact(); | |
1309 | |
1310 // Debugging | |
1311 void prepare_for_verify(); | |
6008 | 1312 void verify(); |
0 | 1313 void print_statistics() PRODUCT_RETURN; |
1314 | |
1315 // Performance Counters support | |
1316 virtual void update_counters(); | |
1317 virtual void update_counters(size_t used); | |
1318 void initialize_performance_counters(); | |
1319 CollectorCounters* counters() { return collector()->counters(); } | |
1320 | |
1321 // Support for parallel remark of survivor space | |
1322 void* get_data_recorder(int thr_num) { | |
1323 //Delegate to collector | |
1324 return collector()->get_data_recorder(thr_num); | |
1325 } | |
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1326 void sample_eden_chunk() { |
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1327 //Delegate to collector |
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1328 return collector()->sample_eden_chunk(); |
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1329 } |
0 | 1330 |
1331 // Printing | |
1332 const char* name() const; | |
1333 virtual const char* short_name() const { return "CMS"; } | |
1334 void print() const; | |
1335 void printOccupancy(const char* s); | |
1336 bool must_be_youngest() const { return false; } | |
1337 bool must_be_oldest() const { return true; } | |
1338 | |
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1339 // Resize the generation after a compacting GC. The |
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1340 // generation can be treated as a contiguous space |
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1341 // after the compaction. |
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1342 virtual void compute_new_size(); |
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1343 // Resize the generation after a non-compacting |
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1344 // collection. |
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1345 void compute_new_size_free_list(); |
0 | 1346 |
1347 CollectionTypes debug_collection_type() { return _debug_collection_type; } | |
1348 void rotate_debug_collection_type(); | |
1349 }; | |
1350 | |
1351 class ASConcurrentMarkSweepGeneration : public ConcurrentMarkSweepGeneration { | |
1352 | |
1353 // Return the size policy from the heap's collector | |
1354 // policy casted to CMSAdaptiveSizePolicy*. | |
1355 CMSAdaptiveSizePolicy* cms_size_policy() const; | |
1356 | |
1357 // Resize the generation based on the adaptive size | |
1358 // policy. | |
1359 void resize(size_t cur_promo, size_t desired_promo); | |
1360 | |
1361 // Return the GC counters from the collector policy | |
1362 CMSGCAdaptivePolicyCounters* gc_adaptive_policy_counters(); | |
1363 | |
1364 virtual void shrink_by(size_t bytes); | |
1365 | |
1366 public: | |
1367 ASConcurrentMarkSweepGeneration(ReservedSpace rs, size_t initial_byte_size, | |
1368 int level, CardTableRS* ct, | |
1369 bool use_adaptive_freelists, | |
6026 | 1370 FreeBlockDictionary<FreeChunk>::DictionaryChoice |
0 | 1371 dictionaryChoice) : |
1372 ConcurrentMarkSweepGeneration(rs, initial_byte_size, level, ct, | |
1373 use_adaptive_freelists, dictionaryChoice) {} | |
1374 | |
1375 virtual const char* short_name() const { return "ASCMS"; } | |
1376 virtual Generation::Name kind() { return Generation::ASConcurrentMarkSweep; } | |
1377 | |
1378 virtual void update_counters(); | |
1379 virtual void update_counters(size_t used); | |
1380 }; | |
1381 | |
1382 // | |
1383 // Closures of various sorts used by CMS to accomplish its work | |
1384 // | |
1385 | |
1386 // This closure is used to check that a certain set of oops is empty. | |
1387 class FalseClosure: public OopClosure { | |
1388 public: | |
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1389 void do_oop(oop* p) { guarantee(false, "Should be an empty set"); } |
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1390 void do_oop(narrowOop* p) { guarantee(false, "Should be an empty set"); } |
0 | 1391 }; |
1392 | |
1393 // This closure is used to do concurrent marking from the roots | |
1394 // following the first checkpoint. | |
1395 class MarkFromRootsClosure: public BitMapClosure { | |
1396 CMSCollector* _collector; | |
1397 MemRegion _span; | |
1398 CMSBitMap* _bitMap; | |
1399 CMSBitMap* _mut; | |
1400 CMSMarkStack* _markStack; | |
1401 bool _yield; | |
1402 int _skipBits; | |
1403 HeapWord* _finger; | |
1404 HeapWord* _threshold; | |
1405 DEBUG_ONLY(bool _verifying;) | |
1406 | |
1407 public: | |
1408 MarkFromRootsClosure(CMSCollector* collector, MemRegion span, | |
1409 CMSBitMap* bitMap, | |
1410 CMSMarkStack* markStack, | |
1411 bool should_yield, bool verifying = false); | |
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1412 bool do_bit(size_t offset); |
0 | 1413 void reset(HeapWord* addr); |
1414 inline void do_yield_check(); | |
1415 | |
1416 private: | |
1417 void scanOopsInOop(HeapWord* ptr); | |
1418 void do_yield_work(); | |
1419 }; | |
1420 | |
1421 // This closure is used to do concurrent multi-threaded | |
1422 // marking from the roots following the first checkpoint. | |
1423 // XXX This should really be a subclass of The serial version | |
1424 // above, but i have not had the time to refactor things cleanly. | |
1425 // That willbe done for Dolphin. | |
1426 class Par_MarkFromRootsClosure: public BitMapClosure { | |
1427 CMSCollector* _collector; | |
1428 MemRegion _whole_span; | |
1429 MemRegion _span; | |
1430 CMSBitMap* _bit_map; | |
1431 CMSBitMap* _mut; | |
1432 OopTaskQueue* _work_queue; | |
1433 CMSMarkStack* _overflow_stack; | |
1434 bool _yield; | |
1435 int _skip_bits; | |
1436 HeapWord* _finger; | |
1437 HeapWord* _threshold; | |
1438 CMSConcMarkingTask* _task; | |
1439 public: | |
1440 Par_MarkFromRootsClosure(CMSConcMarkingTask* task, CMSCollector* collector, | |
1441 MemRegion span, | |
1442 CMSBitMap* bit_map, | |
1443 OopTaskQueue* work_queue, | |
1444 CMSMarkStack* overflow_stack, | |
1445 bool should_yield); | |
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1446 bool do_bit(size_t offset); |
0 | 1447 inline void do_yield_check(); |
1448 | |
1449 private: | |
1450 void scan_oops_in_oop(HeapWord* ptr); | |
1451 void do_yield_work(); | |
1452 bool get_work_from_overflow_stack(); | |
1453 }; | |
1454 | |
1455 // The following closures are used to do certain kinds of verification of | |
1456 // CMS marking. | |
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1457 class PushAndMarkVerifyClosure: public CMSOopClosure { |
0 | 1458 CMSCollector* _collector; |
1459 MemRegion _span; | |
1460 CMSBitMap* _verification_bm; | |
1461 CMSBitMap* _cms_bm; | |
1462 CMSMarkStack* _mark_stack; | |
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1463 protected: |
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1464 void do_oop(oop p); |
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1465 template <class T> inline void do_oop_work(T *p) { |
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1466 oop obj = oopDesc::load_decode_heap_oop(p); |
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1467 do_oop(obj); |
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1468 } |
0 | 1469 public: |
1470 PushAndMarkVerifyClosure(CMSCollector* cms_collector, | |
1471 MemRegion span, | |
1472 CMSBitMap* verification_bm, | |
1473 CMSBitMap* cms_bm, | |
1474 CMSMarkStack* mark_stack); | |
1475 void do_oop(oop* p); | |
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1476 void do_oop(narrowOop* p); |
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1477 |
0 | 1478 // Deal with a stack overflow condition |
1479 void handle_stack_overflow(HeapWord* lost); | |
1480 }; | |
1481 | |
1482 class MarkFromRootsVerifyClosure: public BitMapClosure { | |
1483 CMSCollector* _collector; | |
1484 MemRegion _span; | |
1485 CMSBitMap* _verification_bm; | |
1486 CMSBitMap* _cms_bm; | |
1487 CMSMarkStack* _mark_stack; | |
1488 HeapWord* _finger; | |
1489 PushAndMarkVerifyClosure _pam_verify_closure; | |
1490 public: | |
1491 MarkFromRootsVerifyClosure(CMSCollector* collector, MemRegion span, | |
1492 CMSBitMap* verification_bm, | |
1493 CMSBitMap* cms_bm, | |
1494 CMSMarkStack* mark_stack); | |
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1495 bool do_bit(size_t offset); |
0 | 1496 void reset(HeapWord* addr); |
1497 }; | |
1498 | |
1499 | |
1500 // This closure is used to check that a certain set of bits is | |
1501 // "empty" (i.e. the bit vector doesn't have any 1-bits). | |
1502 class FalseBitMapClosure: public BitMapClosure { | |
1503 public: | |
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1504 bool do_bit(size_t offset) { |
0 | 1505 guarantee(false, "Should not have a 1 bit"); |
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1506 return true; |
0 | 1507 } |
1508 }; | |
1509 | |
1510 // This closure is used during the second checkpointing phase | |
1511 // to rescan the marked objects on the dirty cards in the mod | |
1512 // union table and the card table proper. It's invoked via | |
1513 // MarkFromDirtyCardsClosure below. It uses either | |
1514 // [Par_]MarkRefsIntoAndScanClosure (Par_ in the parallel case) | |
1515 // declared in genOopClosures.hpp to accomplish some of its work. | |
1516 // In the parallel case the bitMap is shared, so access to | |
1517 // it needs to be suitably synchronized for updates by embedded | |
1518 // closures that update it; however, this closure itself only | |
1519 // reads the bit_map and because it is idempotent, is immune to | |
1520 // reading stale values. | |
1521 class ScanMarkedObjectsAgainClosure: public UpwardsObjectClosure { | |
1522 #ifdef ASSERT | |
1523 CMSCollector* _collector; | |
1524 MemRegion _span; | |
1525 union { | |
1526 CMSMarkStack* _mark_stack; | |
1527 OopTaskQueue* _work_queue; | |
1528 }; | |
1529 #endif // ASSERT | |
1530 bool _parallel; | |
1531 CMSBitMap* _bit_map; | |
1532 union { | |
1533 MarkRefsIntoAndScanClosure* _scan_closure; | |
1534 Par_MarkRefsIntoAndScanClosure* _par_scan_closure; | |
1535 }; | |
1536 | |
1537 public: | |
1538 ScanMarkedObjectsAgainClosure(CMSCollector* collector, | |
1539 MemRegion span, | |
1540 ReferenceProcessor* rp, | |
1541 CMSBitMap* bit_map, | |
1542 CMSMarkStack* mark_stack, | |
1543 MarkRefsIntoAndScanClosure* cl): | |
1544 #ifdef ASSERT | |
1545 _collector(collector), | |
1546 _span(span), | |
1547 _mark_stack(mark_stack), | |
1548 #endif // ASSERT | |
1549 _parallel(false), | |
1550 _bit_map(bit_map), | |
1551 _scan_closure(cl) { } | |
1552 | |
1553 ScanMarkedObjectsAgainClosure(CMSCollector* collector, | |
1554 MemRegion span, | |
1555 ReferenceProcessor* rp, | |
1556 CMSBitMap* bit_map, | |
1557 OopTaskQueue* work_queue, | |
1558 Par_MarkRefsIntoAndScanClosure* cl): | |
1559 #ifdef ASSERT | |
1560 _collector(collector), | |
1561 _span(span), | |
1562 _work_queue(work_queue), | |
1563 #endif // ASSERT | |
1564 _parallel(true), | |
1565 _bit_map(bit_map), | |
1566 _par_scan_closure(cl) { } | |
1567 | |
1568 bool do_object_b(oop obj) { | |
1569 guarantee(false, "Call do_object_b(oop, MemRegion) form instead"); | |
1570 return false; | |
1571 } | |
1572 bool do_object_bm(oop p, MemRegion mr); | |
1573 }; | |
1574 | |
1575 // This closure is used during the second checkpointing phase | |
1576 // to rescan the marked objects on the dirty cards in the mod | |
1577 // union table and the card table proper. It invokes | |
1578 // ScanMarkedObjectsAgainClosure above to accomplish much of its work. | |
1579 // In the parallel case, the bit map is shared and requires | |
1580 // synchronized access. | |
1581 class MarkFromDirtyCardsClosure: public MemRegionClosure { | |
1582 CompactibleFreeListSpace* _space; | |
1583 ScanMarkedObjectsAgainClosure _scan_cl; | |
1584 size_t _num_dirty_cards; | |
1585 | |
1586 public: | |
1587 MarkFromDirtyCardsClosure(CMSCollector* collector, | |
1588 MemRegion span, | |
1589 CompactibleFreeListSpace* space, | |
1590 CMSBitMap* bit_map, | |
1591 CMSMarkStack* mark_stack, | |
1592 MarkRefsIntoAndScanClosure* cl): | |
1593 _space(space), | |
1594 _num_dirty_cards(0), | |
1595 _scan_cl(collector, span, collector->ref_processor(), bit_map, | |
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1596 mark_stack, cl) { } |
0 | 1597 |
1598 MarkFromDirtyCardsClosure(CMSCollector* collector, | |
1599 MemRegion span, | |
1600 CompactibleFreeListSpace* space, | |
1601 CMSBitMap* bit_map, | |
1602 OopTaskQueue* work_queue, | |
1603 Par_MarkRefsIntoAndScanClosure* cl): | |
1604 _space(space), | |
1605 _num_dirty_cards(0), | |
1606 _scan_cl(collector, span, collector->ref_processor(), bit_map, | |
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1607 work_queue, cl) { } |
0 | 1608 |
1609 void do_MemRegion(MemRegion mr); | |
1610 void set_space(CompactibleFreeListSpace* space) { _space = space; } | |
1611 size_t num_dirty_cards() { return _num_dirty_cards; } | |
1612 }; | |
1613 | |
1614 // This closure is used in the non-product build to check | |
1615 // that there are no MemRegions with a certain property. | |
1616 class FalseMemRegionClosure: public MemRegionClosure { | |
1617 void do_MemRegion(MemRegion mr) { | |
1618 guarantee(!mr.is_empty(), "Shouldn't be empty"); | |
1619 guarantee(false, "Should never be here"); | |
1620 } | |
1621 }; | |
1622 | |
1623 // This closure is used during the precleaning phase | |
1624 // to "carefully" rescan marked objects on dirty cards. | |
1625 // It uses MarkRefsIntoAndScanClosure declared in genOopClosures.hpp | |
1626 // to accomplish some of its work. | |
1627 class ScanMarkedObjectsAgainCarefullyClosure: public ObjectClosureCareful { | |
1628 CMSCollector* _collector; | |
1629 MemRegion _span; | |
1630 bool _yield; | |
1631 Mutex* _freelistLock; | |
1632 CMSBitMap* _bitMap; | |
1633 CMSMarkStack* _markStack; | |
1634 MarkRefsIntoAndScanClosure* _scanningClosure; | |
1635 | |
1636 public: | |
1637 ScanMarkedObjectsAgainCarefullyClosure(CMSCollector* collector, | |
1638 MemRegion span, | |
1639 CMSBitMap* bitMap, | |
1640 CMSMarkStack* markStack, | |
1641 MarkRefsIntoAndScanClosure* cl, | |
1642 bool should_yield): | |
1643 _collector(collector), | |
1644 _span(span), | |
1645 _yield(should_yield), | |
1646 _bitMap(bitMap), | |
1647 _markStack(markStack), | |
1648 _scanningClosure(cl) { | |
1649 } | |
1650 | |
1651 void do_object(oop p) { | |
1652 guarantee(false, "call do_object_careful instead"); | |
1653 } | |
1654 | |
1655 size_t do_object_careful(oop p) { | |
1656 guarantee(false, "Unexpected caller"); | |
1657 return 0; | |
1658 } | |
1659 | |
1660 size_t do_object_careful_m(oop p, MemRegion mr); | |
1661 | |
1662 void setFreelistLock(Mutex* m) { | |
1663 _freelistLock = m; | |
1664 _scanningClosure->set_freelistLock(m); | |
1665 } | |
1666 | |
1667 private: | |
1668 inline bool do_yield_check(); | |
1669 | |
1670 void do_yield_work(); | |
1671 }; | |
1672 | |
1673 class SurvivorSpacePrecleanClosure: public ObjectClosureCareful { | |
1674 CMSCollector* _collector; | |
1675 MemRegion _span; | |
1676 bool _yield; | |
1677 CMSBitMap* _bit_map; | |
1678 CMSMarkStack* _mark_stack; | |
1679 PushAndMarkClosure* _scanning_closure; | |
1680 unsigned int _before_count; | |
1681 | |
1682 public: | |
1683 SurvivorSpacePrecleanClosure(CMSCollector* collector, | |
1684 MemRegion span, | |
1685 CMSBitMap* bit_map, | |
1686 CMSMarkStack* mark_stack, | |
1687 PushAndMarkClosure* cl, | |
1688 unsigned int before_count, | |
1689 bool should_yield): | |
1690 _collector(collector), | |
1691 _span(span), | |
1692 _yield(should_yield), | |
1693 _bit_map(bit_map), | |
1694 _mark_stack(mark_stack), | |
1695 _scanning_closure(cl), | |
1696 _before_count(before_count) | |
1697 { } | |
1698 | |
1699 void do_object(oop p) { | |
1700 guarantee(false, "call do_object_careful instead"); | |
1701 } | |
1702 | |
1703 size_t do_object_careful(oop p); | |
1704 | |
1705 size_t do_object_careful_m(oop p, MemRegion mr) { | |
1706 guarantee(false, "Unexpected caller"); | |
1707 return 0; | |
1708 } | |
1709 | |
1710 private: | |
1711 inline void do_yield_check(); | |
1712 void do_yield_work(); | |
1713 }; | |
1714 | |
1715 // This closure is used to accomplish the sweeping work | |
1716 // after the second checkpoint but before the concurrent reset | |
1717 // phase. | |
1718 // | |
1719 // Terminology | |
1720 // left hand chunk (LHC) - block of one or more chunks currently being | |
1721 // coalesced. The LHC is available for coalescing with a new chunk. | |
1722 // right hand chunk (RHC) - block that is currently being swept that is | |
1723 // free or garbage that can be coalesced with the LHC. | |
1724 // _inFreeRange is true if there is currently a LHC | |
1725 // _lastFreeRangeCoalesced is true if the LHC consists of more than one chunk. | |
1726 // _freeRangeInFreeLists is true if the LHC is in the free lists. | |
1727 // _freeFinger is the address of the current LHC | |
1728 class SweepClosure: public BlkClosureCareful { | |
1729 CMSCollector* _collector; // collector doing the work | |
1730 ConcurrentMarkSweepGeneration* _g; // Generation being swept | |
1731 CompactibleFreeListSpace* _sp; // Space being swept | |
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1732 HeapWord* _limit;// the address at or above which the sweep should stop |
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1733 // because we do not expect newly garbage blocks |
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1734 // eligible for sweeping past that address. |
0 | 1735 Mutex* _freelistLock; // Free list lock (in space) |
1736 CMSBitMap* _bitMap; // Marking bit map (in | |
1737 // generation) | |
1738 bool _inFreeRange; // Indicates if we are in the | |
1739 // midst of a free run | |
1740 bool _freeRangeInFreeLists; | |
1741 // Often, we have just found | |
1742 // a free chunk and started | |
1743 // a new free range; we do not | |
1744 // eagerly remove this chunk from | |
1745 // the free lists unless there is | |
1746 // a possibility of coalescing. | |
1747 // When true, this flag indicates | |
1748 // that the _freeFinger below | |
1749 // points to a potentially free chunk | |
1750 // that may still be in the free lists | |
1751 bool _lastFreeRangeCoalesced; | |
1752 // free range contains chunks | |
1753 // coalesced | |
1754 bool _yield; | |
1755 // Whether sweeping should be | |
1756 // done with yields. For instance | |
1757 // when done by the foreground | |
1758 // collector we shouldn't yield. | |
1759 HeapWord* _freeFinger; // When _inFreeRange is set, the | |
1760 // pointer to the "left hand | |
1761 // chunk" | |
1762 size_t _freeRangeSize; | |
1763 // When _inFreeRange is set, this | |
1764 // indicates the accumulated size | |
1765 // of the "left hand chunk" | |
1766 NOT_PRODUCT( | |
1767 size_t _numObjectsFreed; | |
1768 size_t _numWordsFreed; | |
1769 size_t _numObjectsLive; | |
1770 size_t _numWordsLive; | |
1771 size_t _numObjectsAlreadyFree; | |
1772 size_t _numWordsAlreadyFree; | |
1773 FreeChunk* _last_fc; | |
1774 ) | |
1775 private: | |
1776 // Code that is common to a free chunk or garbage when | |
1777 // encountered during sweeping. | |
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1778 void do_post_free_or_garbage_chunk(FreeChunk *fc, size_t chunkSize); |
0 | 1779 // Process a free chunk during sweeping. |
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1780 void do_already_free_chunk(FreeChunk *fc); |
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1781 // Work method called when processing an already free or a |
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1782 // freshly garbage chunk to do a lookahead and possibly a |
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1783 // premptive flush if crossing over _limit. |
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1784 void lookahead_and_flush(FreeChunk* fc, size_t chunkSize); |
0 | 1785 // Process a garbage chunk during sweeping. |
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1786 size_t do_garbage_chunk(FreeChunk *fc); |
0 | 1787 // Process a live chunk during sweeping. |
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1788 size_t do_live_chunk(FreeChunk* fc); |
0 | 1789 |
1790 // Accessors. | |
1791 HeapWord* freeFinger() const { return _freeFinger; } | |
1792 void set_freeFinger(HeapWord* v) { _freeFinger = v; } | |
1793 bool inFreeRange() const { return _inFreeRange; } | |
1794 void set_inFreeRange(bool v) { _inFreeRange = v; } | |
1795 bool lastFreeRangeCoalesced() const { return _lastFreeRangeCoalesced; } | |
1796 void set_lastFreeRangeCoalesced(bool v) { _lastFreeRangeCoalesced = v; } | |
1797 bool freeRangeInFreeLists() const { return _freeRangeInFreeLists; } | |
1798 void set_freeRangeInFreeLists(bool v) { _freeRangeInFreeLists = v; } | |
1799 | |
1800 // Initialize a free range. | |
1801 void initialize_free_range(HeapWord* freeFinger, bool freeRangeInFreeLists); | |
1802 // Return this chunk to the free lists. | |
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1803 void flush_cur_free_chunk(HeapWord* chunk, size_t size); |
0 | 1804 |
1805 // Check if we should yield and do so when necessary. | |
1806 inline void do_yield_check(HeapWord* addr); | |
1807 | |
1808 // Yield | |
1809 void do_yield_work(HeapWord* addr); | |
1810 | |
1811 // Debugging/Printing | |
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1812 void print_free_block_coalesced(FreeChunk* fc) const; |
0 | 1813 |
1814 public: | |
1815 SweepClosure(CMSCollector* collector, ConcurrentMarkSweepGeneration* g, | |
1816 CMSBitMap* bitMap, bool should_yield); | |
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1817 ~SweepClosure() PRODUCT_RETURN; |
0 | 1818 |
1819 size_t do_blk_careful(HeapWord* addr); | |
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1820 void print() const { print_on(tty); } |
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1821 void print_on(outputStream *st) const; |
0 | 1822 }; |
1823 | |
1824 // Closures related to weak references processing | |
1825 | |
1826 // During CMS' weak reference processing, this is a | |
1827 // work-routine/closure used to complete transitive | |
1828 // marking of objects as live after a certain point | |
1829 // in which an initial set has been completely accumulated. | |
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1830 // This closure is currently used both during the final |
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1831 // remark stop-world phase, as well as during the concurrent |
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1832 // precleaning of the discovered reference lists. |
0 | 1833 class CMSDrainMarkingStackClosure: public VoidClosure { |
1834 CMSCollector* _collector; | |
1835 MemRegion _span; | |
1836 CMSMarkStack* _mark_stack; | |
1837 CMSBitMap* _bit_map; | |
1838 CMSKeepAliveClosure* _keep_alive; | |
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1839 bool _concurrent_precleaning; |
0 | 1840 public: |
1841 CMSDrainMarkingStackClosure(CMSCollector* collector, MemRegion span, | |
1842 CMSBitMap* bit_map, CMSMarkStack* mark_stack, | |
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1843 CMSKeepAliveClosure* keep_alive, |
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1844 bool cpc): |
0 | 1845 _collector(collector), |
1846 _span(span), | |
1847 _bit_map(bit_map), | |
1848 _mark_stack(mark_stack), | |
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1849 _keep_alive(keep_alive), |
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1850 _concurrent_precleaning(cpc) { |
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1851 assert(_concurrent_precleaning == _keep_alive->concurrent_precleaning(), |
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1852 "Mismatch"); |
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1853 } |
0 | 1854 |
1855 void do_void(); | |
1856 }; | |
1857 | |
1858 // A parallel version of CMSDrainMarkingStackClosure above. | |
1859 class CMSParDrainMarkingStackClosure: public VoidClosure { | |
1860 CMSCollector* _collector; | |
1861 MemRegion _span; | |
1862 OopTaskQueue* _work_queue; | |
1863 CMSBitMap* _bit_map; | |
1864 CMSInnerParMarkAndPushClosure _mark_and_push; | |
1865 | |
1866 public: | |
1867 CMSParDrainMarkingStackClosure(CMSCollector* collector, | |
1868 MemRegion span, CMSBitMap* bit_map, | |
1869 OopTaskQueue* work_queue): | |
1870 _collector(collector), | |
1871 _span(span), | |
1872 _bit_map(bit_map), | |
1873 _work_queue(work_queue), | |
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1874 _mark_and_push(collector, span, bit_map, work_queue) { } |
0 | 1875 |
1876 public: | |
1877 void trim_queue(uint max); | |
1878 void do_void(); | |
1879 }; | |
1880 | |
1881 // Allow yielding or short-circuiting of reference list | |
1882 // prelceaning work. | |
1883 class CMSPrecleanRefsYieldClosure: public YieldClosure { | |
1884 CMSCollector* _collector; | |
1885 void do_yield_work(); | |
1886 public: | |
1887 CMSPrecleanRefsYieldClosure(CMSCollector* collector): | |
1888 _collector(collector) {} | |
1889 virtual bool should_return(); | |
1890 }; | |
1891 | |
1892 | |
1893 // Convenience class that locks free list locks for given CMS collector | |
1894 class FreelistLocker: public StackObj { | |
1895 private: | |
1896 CMSCollector* _collector; | |
1897 public: | |
1898 FreelistLocker(CMSCollector* collector): | |
1899 _collector(collector) { | |
1900 _collector->getFreelistLocks(); | |
1901 } | |
1902 | |
1903 ~FreelistLocker() { | |
1904 _collector->releaseFreelistLocks(); | |
1905 } | |
1906 }; | |
1907 | |
1908 // Mark all dead objects in a given space. | |
1909 class MarkDeadObjectsClosure: public BlkClosure { | |
1910 const CMSCollector* _collector; | |
1911 const CompactibleFreeListSpace* _sp; | |
1912 CMSBitMap* _live_bit_map; | |
1913 CMSBitMap* _dead_bit_map; | |
1914 public: | |
1915 MarkDeadObjectsClosure(const CMSCollector* collector, | |
1916 const CompactibleFreeListSpace* sp, | |
1917 CMSBitMap *live_bit_map, | |
1918 CMSBitMap *dead_bit_map) : | |
1919 _collector(collector), | |
1920 _sp(sp), | |
1921 _live_bit_map(live_bit_map), | |
1922 _dead_bit_map(dead_bit_map) {} | |
1923 size_t do_blk(HeapWord* addr); | |
1924 }; | |
1703
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1925 |
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1926 class TraceCMSMemoryManagerStats : public TraceMemoryManagerStats { |
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1927 |
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1928 public: |
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1929 TraceCMSMemoryManagerStats(CMSCollector::CollectorState phase, GCCause::Cause cause); |
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1930 }; |
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1931 |
1972 | 1932 |
1933 #endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CONCURRENTMARKSWEEPGENERATION_HPP |