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annotate src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.inline.hpp @ 1562:dfe27f03244a
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date | Tue, 01 Jun 2010 11:48:33 -0700 |
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children | f95d63e2154a |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2008, 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 | |
25 inline void CMSBitMap::clear_all() { | |
26 assert_locked(); | |
27 // CMS bitmaps are usually cover large memory regions | |
28 _bm.clear_large(); | |
29 return; | |
30 } | |
31 | |
32 inline size_t CMSBitMap::heapWordToOffset(HeapWord* addr) const { | |
33 return (pointer_delta(addr, _bmStartWord)) >> _shifter; | |
34 } | |
35 | |
36 inline HeapWord* CMSBitMap::offsetToHeapWord(size_t offset) const { | |
37 return _bmStartWord + (offset << _shifter); | |
38 } | |
39 | |
40 inline size_t CMSBitMap::heapWordDiffToOffsetDiff(size_t diff) const { | |
41 assert((diff & ((1 << _shifter) - 1)) == 0, "argument check"); | |
42 return diff >> _shifter; | |
43 } | |
44 | |
45 inline void CMSBitMap::mark(HeapWord* addr) { | |
46 assert_locked(); | |
47 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
48 "outside underlying space?"); | |
49 _bm.set_bit(heapWordToOffset(addr)); | |
50 } | |
51 | |
52 inline bool CMSBitMap::par_mark(HeapWord* addr) { | |
53 assert_locked(); | |
54 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
55 "outside underlying space?"); | |
56 return _bm.par_at_put(heapWordToOffset(addr), true); | |
57 } | |
58 | |
59 inline void CMSBitMap::par_clear(HeapWord* addr) { | |
60 assert_locked(); | |
61 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
62 "outside underlying space?"); | |
63 _bm.par_at_put(heapWordToOffset(addr), false); | |
64 } | |
65 | |
66 inline void CMSBitMap::mark_range(MemRegion mr) { | |
67 NOT_PRODUCT(region_invariant(mr)); | |
68 // Range size is usually just 1 bit. | |
69 _bm.set_range(heapWordToOffset(mr.start()), heapWordToOffset(mr.end()), | |
70 BitMap::small_range); | |
71 } | |
72 | |
73 inline void CMSBitMap::clear_range(MemRegion mr) { | |
74 NOT_PRODUCT(region_invariant(mr)); | |
75 // Range size is usually just 1 bit. | |
76 _bm.clear_range(heapWordToOffset(mr.start()), heapWordToOffset(mr.end()), | |
77 BitMap::small_range); | |
78 } | |
79 | |
80 inline void CMSBitMap::par_mark_range(MemRegion mr) { | |
81 NOT_PRODUCT(region_invariant(mr)); | |
82 // Range size is usually just 1 bit. | |
83 _bm.par_set_range(heapWordToOffset(mr.start()), heapWordToOffset(mr.end()), | |
84 BitMap::small_range); | |
85 } | |
86 | |
87 inline void CMSBitMap::par_clear_range(MemRegion mr) { | |
88 NOT_PRODUCT(region_invariant(mr)); | |
89 // Range size is usually just 1 bit. | |
90 _bm.par_clear_range(heapWordToOffset(mr.start()), heapWordToOffset(mr.end()), | |
91 BitMap::small_range); | |
92 } | |
93 | |
94 inline void CMSBitMap::mark_large_range(MemRegion mr) { | |
95 NOT_PRODUCT(region_invariant(mr)); | |
96 // Range size must be greater than 32 bytes. | |
97 _bm.set_range(heapWordToOffset(mr.start()), heapWordToOffset(mr.end()), | |
98 BitMap::large_range); | |
99 } | |
100 | |
101 inline void CMSBitMap::clear_large_range(MemRegion mr) { | |
102 NOT_PRODUCT(region_invariant(mr)); | |
103 // Range size must be greater than 32 bytes. | |
104 _bm.clear_range(heapWordToOffset(mr.start()), heapWordToOffset(mr.end()), | |
105 BitMap::large_range); | |
106 } | |
107 | |
108 inline void CMSBitMap::par_mark_large_range(MemRegion mr) { | |
109 NOT_PRODUCT(region_invariant(mr)); | |
110 // Range size must be greater than 32 bytes. | |
111 _bm.par_set_range(heapWordToOffset(mr.start()), heapWordToOffset(mr.end()), | |
112 BitMap::large_range); | |
113 } | |
114 | |
115 inline void CMSBitMap::par_clear_large_range(MemRegion mr) { | |
116 NOT_PRODUCT(region_invariant(mr)); | |
117 // Range size must be greater than 32 bytes. | |
118 _bm.par_clear_range(heapWordToOffset(mr.start()), heapWordToOffset(mr.end()), | |
119 BitMap::large_range); | |
120 } | |
121 | |
122 // Starting at "addr" (inclusive) return a memory region | |
123 // corresponding to the first maximally contiguous marked ("1") region. | |
124 inline MemRegion CMSBitMap::getAndClearMarkedRegion(HeapWord* addr) { | |
125 return getAndClearMarkedRegion(addr, endWord()); | |
126 } | |
127 | |
128 // Starting at "start_addr" (inclusive) return a memory region | |
129 // corresponding to the first maximal contiguous marked ("1") region | |
130 // strictly less than end_addr. | |
131 inline MemRegion CMSBitMap::getAndClearMarkedRegion(HeapWord* start_addr, | |
132 HeapWord* end_addr) { | |
133 HeapWord *start, *end; | |
134 assert_locked(); | |
135 start = getNextMarkedWordAddress (start_addr, end_addr); | |
136 end = getNextUnmarkedWordAddress(start, end_addr); | |
137 assert(start <= end, "Consistency check"); | |
138 MemRegion mr(start, end); | |
139 if (!mr.is_empty()) { | |
140 clear_range(mr); | |
141 } | |
142 return mr; | |
143 } | |
144 | |
145 inline bool CMSBitMap::isMarked(HeapWord* addr) const { | |
146 assert_locked(); | |
147 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
148 "outside underlying space?"); | |
149 return _bm.at(heapWordToOffset(addr)); | |
150 } | |
151 | |
152 // The same as isMarked() but without a lock check. | |
153 inline bool CMSBitMap::par_isMarked(HeapWord* addr) const { | |
154 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
155 "outside underlying space?"); | |
156 return _bm.at(heapWordToOffset(addr)); | |
157 } | |
158 | |
159 | |
160 inline bool CMSBitMap::isUnmarked(HeapWord* addr) const { | |
161 assert_locked(); | |
162 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
163 "outside underlying space?"); | |
164 return !_bm.at(heapWordToOffset(addr)); | |
165 } | |
166 | |
167 // Return the HeapWord address corresponding to next "1" bit | |
168 // (inclusive). | |
169 inline HeapWord* CMSBitMap::getNextMarkedWordAddress(HeapWord* addr) const { | |
170 return getNextMarkedWordAddress(addr, endWord()); | |
171 } | |
172 | |
173 // Return the least HeapWord address corresponding to next "1" bit | |
174 // starting at start_addr (inclusive) but strictly less than end_addr. | |
175 inline HeapWord* CMSBitMap::getNextMarkedWordAddress( | |
176 HeapWord* start_addr, HeapWord* end_addr) const { | |
177 assert_locked(); | |
178 size_t nextOffset = _bm.get_next_one_offset( | |
179 heapWordToOffset(start_addr), | |
180 heapWordToOffset(end_addr)); | |
181 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
182 assert(nextAddr >= start_addr && | |
183 nextAddr <= end_addr, "get_next_one postcondition"); | |
184 assert((nextAddr == end_addr) || | |
185 isMarked(nextAddr), "get_next_one postcondition"); | |
186 return nextAddr; | |
187 } | |
188 | |
189 | |
190 // Return the HeapWord address corrsponding to the next "0" bit | |
191 // (inclusive). | |
192 inline HeapWord* CMSBitMap::getNextUnmarkedWordAddress(HeapWord* addr) const { | |
193 return getNextUnmarkedWordAddress(addr, endWord()); | |
194 } | |
195 | |
196 // Return the HeapWord address corrsponding to the next "0" bit | |
197 // (inclusive). | |
198 inline HeapWord* CMSBitMap::getNextUnmarkedWordAddress( | |
199 HeapWord* start_addr, HeapWord* end_addr) const { | |
200 assert_locked(); | |
201 size_t nextOffset = _bm.get_next_zero_offset( | |
202 heapWordToOffset(start_addr), | |
203 heapWordToOffset(end_addr)); | |
204 HeapWord* nextAddr = offsetToHeapWord(nextOffset); | |
205 assert(nextAddr >= start_addr && | |
206 nextAddr <= end_addr, "get_next_zero postcondition"); | |
207 assert((nextAddr == end_addr) || | |
208 isUnmarked(nextAddr), "get_next_zero postcondition"); | |
209 return nextAddr; | |
210 } | |
211 | |
212 inline bool CMSBitMap::isAllClear() const { | |
213 assert_locked(); | |
214 return getNextMarkedWordAddress(startWord()) >= endWord(); | |
215 } | |
216 | |
217 inline void CMSBitMap::iterate(BitMapClosure* cl, HeapWord* left, | |
218 HeapWord* right) { | |
219 assert_locked(); | |
220 left = MAX2(_bmStartWord, left); | |
221 right = MIN2(_bmStartWord + _bmWordSize, right); | |
222 if (right > left) { | |
223 _bm.iterate(cl, heapWordToOffset(left), heapWordToOffset(right)); | |
224 } | |
225 } | |
226 | |
227 inline void CMSCollector::start_icms() { | |
228 if (CMSIncrementalMode) { | |
229 ConcurrentMarkSweepThread::start_icms(); | |
230 } | |
231 } | |
232 | |
233 inline void CMSCollector::stop_icms() { | |
234 if (CMSIncrementalMode) { | |
235 ConcurrentMarkSweepThread::stop_icms(); | |
236 } | |
237 } | |
238 | |
239 inline void CMSCollector::disable_icms() { | |
240 if (CMSIncrementalMode) { | |
241 ConcurrentMarkSweepThread::disable_icms(); | |
242 } | |
243 } | |
244 | |
245 inline void CMSCollector::enable_icms() { | |
246 if (CMSIncrementalMode) { | |
247 ConcurrentMarkSweepThread::enable_icms(); | |
248 } | |
249 } | |
250 | |
251 inline void CMSCollector::icms_wait() { | |
252 if (CMSIncrementalMode) { | |
253 cmsThread()->icms_wait(); | |
254 } | |
255 } | |
256 | |
257 inline void CMSCollector::save_sweep_limits() { | |
258 _cmsGen->save_sweep_limit(); | |
259 _permGen->save_sweep_limit(); | |
260 } | |
261 | |
262 inline bool CMSCollector::is_dead_obj(oop obj) const { | |
263 HeapWord* addr = (HeapWord*)obj; | |
264 assert((_cmsGen->cmsSpace()->is_in_reserved(addr) | |
265 && _cmsGen->cmsSpace()->block_is_obj(addr)) | |
266 || | |
267 (_permGen->cmsSpace()->is_in_reserved(addr) | |
268 && _permGen->cmsSpace()->block_is_obj(addr)), | |
269 "must be object"); | |
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270 return should_unload_classes() && |
0 | 271 _collectorState == Sweeping && |
272 !_markBitMap.isMarked(addr); | |
273 } | |
274 | |
275 inline bool CMSCollector::should_abort_preclean() const { | |
276 // We are in the midst of an "abortable preclean" and either | |
277 // scavenge is done or foreground GC wants to take over collection | |
278 return _collectorState == AbortablePreclean && | |
279 (_abort_preclean || _foregroundGCIsActive || | |
280 GenCollectedHeap::heap()->incremental_collection_will_fail()); | |
281 } | |
282 | |
283 inline size_t CMSCollector::get_eden_used() const { | |
284 return _young_gen->as_DefNewGeneration()->eden()->used(); | |
285 } | |
286 | |
287 inline size_t CMSCollector::get_eden_capacity() const { | |
288 return _young_gen->as_DefNewGeneration()->eden()->capacity(); | |
289 } | |
290 | |
291 inline bool CMSStats::valid() const { | |
292 return _valid_bits == _ALL_VALID; | |
293 } | |
294 | |
295 inline void CMSStats::record_gc0_begin() { | |
296 if (_gc0_begin_time.is_updated()) { | |
297 float last_gc0_period = _gc0_begin_time.seconds(); | |
298 _gc0_period = AdaptiveWeightedAverage::exp_avg(_gc0_period, | |
299 last_gc0_period, _gc0_alpha); | |
300 _gc0_alpha = _saved_alpha; | |
301 _valid_bits |= _GC0_VALID; | |
302 } | |
303 _cms_used_at_gc0_begin = _cms_gen->cmsSpace()->used(); | |
304 | |
305 _gc0_begin_time.update(); | |
306 } | |
307 | |
308 inline void CMSStats::record_gc0_end(size_t cms_gen_bytes_used) { | |
309 float last_gc0_duration = _gc0_begin_time.seconds(); | |
310 _gc0_duration = AdaptiveWeightedAverage::exp_avg(_gc0_duration, | |
311 last_gc0_duration, _gc0_alpha); | |
312 | |
313 // Amount promoted. | |
314 _cms_used_at_gc0_end = cms_gen_bytes_used; | |
315 | |
316 size_t promoted_bytes = 0; | |
317 if (_cms_used_at_gc0_end >= _cms_used_at_gc0_begin) { | |
318 promoted_bytes = _cms_used_at_gc0_end - _cms_used_at_gc0_begin; | |
319 } | |
320 | |
321 // If the younger gen collections were skipped, then the | |
322 // number of promoted bytes will be 0 and adding it to the | |
323 // average will incorrectly lessen the average. It is, however, | |
324 // also possible that no promotion was needed. | |
325 // | |
326 // _gc0_promoted used to be calculated as | |
327 // _gc0_promoted = AdaptiveWeightedAverage::exp_avg(_gc0_promoted, | |
328 // promoted_bytes, _gc0_alpha); | |
329 _cms_gen->gc_stats()->avg_promoted()->sample(promoted_bytes); | |
330 _gc0_promoted = (size_t) _cms_gen->gc_stats()->avg_promoted()->average(); | |
331 | |
332 // Amount directly allocated. | |
333 size_t allocated_bytes = _cms_gen->direct_allocated_words() * HeapWordSize; | |
334 _cms_gen->reset_direct_allocated_words(); | |
335 _cms_allocated = AdaptiveWeightedAverage::exp_avg(_cms_allocated, | |
336 allocated_bytes, _gc0_alpha); | |
337 } | |
338 | |
339 inline void CMSStats::record_cms_begin() { | |
340 _cms_timer.stop(); | |
341 | |
342 // This is just an approximate value, but is good enough. | |
343 _cms_used_at_cms_begin = _cms_used_at_gc0_end; | |
344 | |
345 _cms_period = AdaptiveWeightedAverage::exp_avg((float)_cms_period, | |
346 (float) _cms_timer.seconds(), _cms_alpha); | |
347 _cms_begin_time.update(); | |
348 | |
349 _cms_timer.reset(); | |
350 _cms_timer.start(); | |
351 } | |
352 | |
353 inline void CMSStats::record_cms_end() { | |
354 _cms_timer.stop(); | |
355 | |
356 float cur_duration = _cms_timer.seconds(); | |
357 _cms_duration = AdaptiveWeightedAverage::exp_avg(_cms_duration, | |
358 cur_duration, _cms_alpha); | |
359 | |
360 // Avoid division by 0. | |
361 const size_t cms_used_mb = MAX2(_cms_used_at_cms_begin / M, (size_t)1); | |
362 _cms_duration_per_mb = AdaptiveWeightedAverage::exp_avg(_cms_duration_per_mb, | |
363 cur_duration / cms_used_mb, | |
364 _cms_alpha); | |
365 | |
366 _cms_end_time.update(); | |
367 _cms_alpha = _saved_alpha; | |
368 _allow_duty_cycle_reduction = true; | |
369 _valid_bits |= _CMS_VALID; | |
370 | |
371 _cms_timer.start(); | |
372 } | |
373 | |
374 inline double CMSStats::cms_time_since_begin() const { | |
375 return _cms_begin_time.seconds(); | |
376 } | |
377 | |
378 inline double CMSStats::cms_time_since_end() const { | |
379 return _cms_end_time.seconds(); | |
380 } | |
381 | |
382 inline double CMSStats::promotion_rate() const { | |
383 assert(valid(), "statistics not valid yet"); | |
384 return gc0_promoted() / gc0_period(); | |
385 } | |
386 | |
387 inline double CMSStats::cms_allocation_rate() const { | |
388 assert(valid(), "statistics not valid yet"); | |
389 return cms_allocated() / gc0_period(); | |
390 } | |
391 | |
392 inline double CMSStats::cms_consumption_rate() const { | |
393 assert(valid(), "statistics not valid yet"); | |
394 return (gc0_promoted() + cms_allocated()) / gc0_period(); | |
395 } | |
396 | |
397 inline unsigned int CMSStats::icms_update_duty_cycle() { | |
398 // Update the duty cycle only if pacing is enabled and the stats are valid | |
399 // (after at least one young gen gc and one cms cycle have completed). | |
400 if (CMSIncrementalPacing && valid()) { | |
401 return icms_update_duty_cycle_impl(); | |
402 } | |
403 return _icms_duty_cycle; | |
404 } | |
405 | |
406 inline void ConcurrentMarkSweepGeneration::save_sweep_limit() { | |
407 cmsSpace()->save_sweep_limit(); | |
408 } | |
409 | |
410 inline size_t ConcurrentMarkSweepGeneration::capacity() const { | |
411 return _cmsSpace->capacity(); | |
412 } | |
413 | |
414 inline size_t ConcurrentMarkSweepGeneration::used() const { | |
415 return _cmsSpace->used(); | |
416 } | |
417 | |
418 inline size_t ConcurrentMarkSweepGeneration::free() const { | |
419 return _cmsSpace->free(); | |
420 } | |
421 | |
422 inline MemRegion ConcurrentMarkSweepGeneration::used_region() const { | |
423 return _cmsSpace->used_region(); | |
424 } | |
425 | |
426 inline MemRegion ConcurrentMarkSweepGeneration::used_region_at_save_marks() const { | |
427 return _cmsSpace->used_region_at_save_marks(); | |
428 } | |
429 | |
430 inline void MarkFromRootsClosure::do_yield_check() { | |
431 if (ConcurrentMarkSweepThread::should_yield() && | |
432 !_collector->foregroundGCIsActive() && | |
433 _yield) { | |
434 do_yield_work(); | |
435 } | |
436 } | |
437 | |
438 inline void Par_MarkFromRootsClosure::do_yield_check() { | |
439 if (ConcurrentMarkSweepThread::should_yield() && | |
440 !_collector->foregroundGCIsActive() && | |
441 _yield) { | |
442 do_yield_work(); | |
443 } | |
444 } | |
445 | |
446 // Return value of "true" indicates that the on-going preclean | |
447 // should be aborted. | |
448 inline bool ScanMarkedObjectsAgainCarefullyClosure::do_yield_check() { | |
449 if (ConcurrentMarkSweepThread::should_yield() && | |
450 !_collector->foregroundGCIsActive() && | |
451 _yield) { | |
452 // Sample young gen size before and after yield | |
453 _collector->sample_eden(); | |
454 do_yield_work(); | |
455 _collector->sample_eden(); | |
456 return _collector->should_abort_preclean(); | |
457 } | |
458 return false; | |
459 } | |
460 | |
461 inline void SurvivorSpacePrecleanClosure::do_yield_check() { | |
462 if (ConcurrentMarkSweepThread::should_yield() && | |
463 !_collector->foregroundGCIsActive() && | |
464 _yield) { | |
465 // Sample young gen size before and after yield | |
466 _collector->sample_eden(); | |
467 do_yield_work(); | |
468 _collector->sample_eden(); | |
469 } | |
470 } | |
471 | |
472 inline void SweepClosure::do_yield_check(HeapWord* addr) { | |
473 if (ConcurrentMarkSweepThread::should_yield() && | |
474 !_collector->foregroundGCIsActive() && | |
475 _yield) { | |
476 do_yield_work(addr); | |
477 } | |
478 } | |
479 | |
480 inline void MarkRefsIntoAndScanClosure::do_yield_check() { | |
481 // The conditions are ordered for the remarking phase | |
482 // when _yield is false. | |
483 if (_yield && | |
484 !_collector->foregroundGCIsActive() && | |
485 ConcurrentMarkSweepThread::should_yield()) { | |
486 do_yield_work(); | |
487 } | |
488 } | |
489 | |
490 | |
491 inline void ModUnionClosure::do_MemRegion(MemRegion mr) { | |
492 // Align the end of mr so it's at a card boundary. | |
493 // This is superfluous except at the end of the space; | |
494 // we should do better than this XXX | |
495 MemRegion mr2(mr.start(), (HeapWord*)round_to((intptr_t)mr.end(), | |
496 CardTableModRefBS::card_size /* bytes */)); | |
497 _t->mark_range(mr2); | |
498 } | |
499 | |
500 inline void ModUnionClosurePar::do_MemRegion(MemRegion mr) { | |
501 // Align the end of mr so it's at a card boundary. | |
502 // This is superfluous except at the end of the space; | |
503 // we should do better than this XXX | |
504 MemRegion mr2(mr.start(), (HeapWord*)round_to((intptr_t)mr.end(), | |
505 CardTableModRefBS::card_size /* bytes */)); | |
506 _t->par_mark_range(mr2); | |
507 } |