Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp @ 9072:8617e38bb4cb
8008508: CMS does not correctly reduce heap size after a Full GC
Reviewed-by: johnc, ysr
| author | jmasa |
|---|---|
| date | Mon, 11 Feb 2013 10:31:56 -0800 |
| parents | f64ffbf81af5 |
| children | 7b835924c31c |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 8035 | 2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CONCURRENTMARKSWEEPGENERATION_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CONCURRENTMARKSWEEPGENERATION_HPP | |
| 27 | |
| 28 #include "gc_implementation/shared/gSpaceCounters.hpp" | |
| 29 #include "gc_implementation/shared/gcStats.hpp" | |
| 30 #include "gc_implementation/shared/generationCounters.hpp" | |
| 6026 | 31 #include "memory/freeBlockDictionary.hpp" |
| 1972 | 32 #include "memory/generation.hpp" |
| 33 #include "runtime/mutexLocker.hpp" | |
| 34 #include "runtime/virtualspace.hpp" | |
| 35 #include "services/memoryService.hpp" | |
| 36 #include "utilities/bitMap.inline.hpp" | |
| 37 #include "utilities/stack.inline.hpp" | |
| 38 #include "utilities/taskqueue.hpp" | |
| 39 #include "utilities/yieldingWorkgroup.hpp" | |
| 40 | |
| 0 | 41 // ConcurrentMarkSweepGeneration is in support of a concurrent |
| 42 // mark-sweep old generation in the Detlefs-Printezis--Boehm-Demers-Schenker | |
| 43 // style. We assume, for now, that this generation is always the | |
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44 // seniormost generation and for simplicity |
| 0 | 45 // in the first implementation, that this generation is a single compactible |
| 46 // space. Neither of these restrictions appears essential, and will be | |
| 47 // relaxed in the future when more time is available to implement the | |
| 48 // greater generality (and there's a need for it). | |
| 49 // | |
| 50 // Concurrent mode failures are currently handled by | |
| 51 // means of a sliding mark-compact. | |
| 52 | |
| 53 class CMSAdaptiveSizePolicy; | |
| 54 class CMSConcMarkingTask; | |
| 55 class CMSGCAdaptivePolicyCounters; | |
| 56 class ConcurrentMarkSweepGeneration; | |
| 57 class ConcurrentMarkSweepPolicy; | |
| 58 class ConcurrentMarkSweepThread; | |
| 59 class CompactibleFreeListSpace; | |
| 60 class FreeChunk; | |
| 61 class PromotionInfo; | |
| 62 class ScanMarkedObjectsAgainCarefullyClosure; | |
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63 class TenuredGeneration; |
| 0 | 64 |
| 65 // A generic CMS bit map. It's the basis for both the CMS marking bit map | |
| 66 // as well as for the mod union table (in each case only a subset of the | |
| 67 // methods are used). This is essentially a wrapper around the BitMap class, | |
| 68 // with one bit per (1<<_shifter) HeapWords. (i.e. for the marking bit map, | |
| 69 // we have _shifter == 0. and for the mod union table we have | |
| 70 // shifter == CardTableModRefBS::card_shift - LogHeapWordSize.) | |
| 71 // XXX 64-bit issues in BitMap? | |
| 72 class CMSBitMap VALUE_OBJ_CLASS_SPEC { | |
| 73 friend class VMStructs; | |
| 74 | |
| 75 HeapWord* _bmStartWord; // base address of range covered by map | |
| 76 size_t _bmWordSize; // map size (in #HeapWords covered) | |
| 77 const int _shifter; // shifts to convert HeapWord to bit position | |
| 78 VirtualSpace _virtual_space; // underlying the bit map | |
| 79 BitMap _bm; // the bit map itself | |
| 80 public: | |
| 81 Mutex* const _lock; // mutex protecting _bm; | |
| 82 | |
| 83 public: | |
| 84 // constructor | |
| 85 CMSBitMap(int shifter, int mutex_rank, const char* mutex_name); | |
| 86 | |
| 87 // allocates the actual storage for the map | |
| 88 bool allocate(MemRegion mr); | |
| 89 // field getter | |
| 90 Mutex* lock() const { return _lock; } | |
| 91 // locking verifier convenience function | |
| 92 void assert_locked() const PRODUCT_RETURN; | |
| 93 | |
| 94 // inquiries | |
| 95 HeapWord* startWord() const { return _bmStartWord; } | |
| 96 size_t sizeInWords() const { return _bmWordSize; } | |
| 97 size_t sizeInBits() const { return _bm.size(); } | |
| 98 // the following is one past the last word in space | |
| 99 HeapWord* endWord() const { return _bmStartWord + _bmWordSize; } | |
| 100 | |
| 101 // reading marks | |
| 102 bool isMarked(HeapWord* addr) const; | |
| 103 bool par_isMarked(HeapWord* addr) const; // do not lock checks | |
| 104 bool isUnmarked(HeapWord* addr) const; | |
| 105 bool isAllClear() const; | |
| 106 | |
| 107 // writing marks | |
| 108 void mark(HeapWord* addr); | |
| 109 // For marking by parallel GC threads; | |
| 110 // returns true if we did, false if another thread did | |
| 111 bool par_mark(HeapWord* addr); | |
| 112 | |
| 113 void mark_range(MemRegion mr); | |
| 114 void par_mark_range(MemRegion mr); | |
| 115 void mark_large_range(MemRegion mr); | |
| 116 void par_mark_large_range(MemRegion mr); | |
| 117 void par_clear(HeapWord* addr); // For unmarking by parallel GC threads. | |
| 118 void clear_range(MemRegion mr); | |
| 119 void par_clear_range(MemRegion mr); | |
| 120 void clear_large_range(MemRegion mr); | |
| 121 void par_clear_large_range(MemRegion mr); | |
| 122 void clear_all(); | |
| 123 void clear_all_incrementally(); // Not yet implemented!! | |
| 124 | |
| 125 NOT_PRODUCT( | |
| 126 // checks the memory region for validity | |
| 127 void region_invariant(MemRegion mr); | |
| 128 ) | |
| 129 | |
| 130 // iteration | |
| 131 void iterate(BitMapClosure* cl) { | |
| 132 _bm.iterate(cl); | |
| 133 } | |
| 134 void iterate(BitMapClosure* cl, HeapWord* left, HeapWord* right); | |
| 135 void dirty_range_iterate_clear(MemRegionClosure* cl); | |
| 136 void dirty_range_iterate_clear(MemRegion mr, MemRegionClosure* cl); | |
| 137 | |
| 138 // auxiliary support for iteration | |
| 139 HeapWord* getNextMarkedWordAddress(HeapWord* addr) const; | |
| 140 HeapWord* getNextMarkedWordAddress(HeapWord* start_addr, | |
| 141 HeapWord* end_addr) const; | |
| 142 HeapWord* getNextUnmarkedWordAddress(HeapWord* addr) const; | |
| 143 HeapWord* getNextUnmarkedWordAddress(HeapWord* start_addr, | |
| 144 HeapWord* end_addr) const; | |
| 145 MemRegion getAndClearMarkedRegion(HeapWord* addr); | |
| 146 MemRegion getAndClearMarkedRegion(HeapWord* start_addr, | |
| 147 HeapWord* end_addr); | |
| 148 | |
| 149 // conversion utilities | |
| 150 HeapWord* offsetToHeapWord(size_t offset) const; | |
| 151 size_t heapWordToOffset(HeapWord* addr) const; | |
| 152 size_t heapWordDiffToOffsetDiff(size_t diff) const; | |
| 153 | |
| 154 // debugging | |
| 155 // is this address range covered by the bit-map? | |
| 156 NOT_PRODUCT( | |
| 157 bool covers(MemRegion mr) const; | |
| 158 bool covers(HeapWord* start, size_t size = 0) const; | |
| 159 ) | |
| 160 void verifyNoOneBitsInRange(HeapWord* left, HeapWord* right) PRODUCT_RETURN; | |
| 161 }; | |
| 162 | |
| 163 // Represents a marking stack used by the CMS collector. | |
| 164 // Ideally this should be GrowableArray<> just like MSC's marking stack(s). | |
| 6197 | 165 class CMSMarkStack: public CHeapObj<mtGC> { |
| 0 | 166 // |
| 167 friend class CMSCollector; // to get at expasion stats further below | |
| 168 // | |
| 169 | |
| 170 VirtualSpace _virtual_space; // space for the stack | |
| 171 oop* _base; // bottom of stack | |
| 172 size_t _index; // one more than last occupied index | |
| 173 size_t _capacity; // max #elements | |
| 174 Mutex _par_lock; // an advisory lock used in case of parallel access | |
| 175 NOT_PRODUCT(size_t _max_depth;) // max depth plumbed during run | |
| 176 | |
| 177 protected: | |
| 178 size_t _hit_limit; // we hit max stack size limit | |
| 179 size_t _failed_double; // we failed expansion before hitting limit | |
| 180 | |
| 181 public: | |
| 182 CMSMarkStack(): | |
| 183 _par_lock(Mutex::event, "CMSMarkStack._par_lock", true), | |
| 184 _hit_limit(0), | |
| 185 _failed_double(0) {} | |
| 186 | |
| 187 bool allocate(size_t size); | |
| 188 | |
| 189 size_t capacity() const { return _capacity; } | |
| 190 | |
| 191 oop pop() { | |
| 192 if (!isEmpty()) { | |
| 193 return _base[--_index] ; | |
| 194 } | |
| 195 return NULL; | |
| 196 } | |
| 197 | |
| 198 bool push(oop ptr) { | |
| 199 if (isFull()) { | |
| 200 return false; | |
| 201 } else { | |
| 202 _base[_index++] = ptr; | |
| 203 NOT_PRODUCT(_max_depth = MAX2(_max_depth, _index)); | |
| 204 return true; | |
| 205 } | |
| 206 } | |
| 207 | |
| 208 bool isEmpty() const { return _index == 0; } | |
| 209 bool isFull() const { | |
| 210 assert(_index <= _capacity, "buffer overflow"); | |
| 211 return _index == _capacity; | |
| 212 } | |
| 213 | |
| 214 size_t length() { return _index; } | |
| 215 | |
| 216 // "Parallel versions" of some of the above | |
| 217 oop par_pop() { | |
| 218 // lock and pop | |
| 219 MutexLockerEx x(&_par_lock, Mutex::_no_safepoint_check_flag); | |
| 220 return pop(); | |
| 221 } | |
| 222 | |
| 223 bool par_push(oop ptr) { | |
| 224 // lock and push | |
| 225 MutexLockerEx x(&_par_lock, Mutex::_no_safepoint_check_flag); | |
| 226 return push(ptr); | |
| 227 } | |
| 228 | |
| 229 // Forcibly reset the stack, losing all of its contents. | |
| 230 void reset() { | |
| 231 _index = 0; | |
| 232 } | |
| 233 | |
| 234 // Expand the stack, typically in response to an overflow condition | |
| 235 void expand(); | |
| 236 | |
| 237 // Compute the least valued stack element. | |
| 238 oop least_value(HeapWord* low) { | |
| 239 oop least = (oop)low; | |
| 240 for (size_t i = 0; i < _index; i++) { | |
| 241 least = MIN2(least, _base[i]); | |
| 242 } | |
| 243 return least; | |
| 244 } | |
| 245 | |
| 246 // Exposed here to allow stack expansion in || case | |
| 247 Mutex* par_lock() { return &_par_lock; } | |
| 248 }; | |
| 249 | |
| 250 class CardTableRS; | |
| 251 class CMSParGCThreadState; | |
| 252 | |
| 253 class ModUnionClosure: public MemRegionClosure { | |
| 254 protected: | |
| 255 CMSBitMap* _t; | |
| 256 public: | |
| 257 ModUnionClosure(CMSBitMap* t): _t(t) { } | |
| 258 void do_MemRegion(MemRegion mr); | |
| 259 }; | |
| 260 | |
| 261 class ModUnionClosurePar: public ModUnionClosure { | |
| 262 public: | |
| 263 ModUnionClosurePar(CMSBitMap* t): ModUnionClosure(t) { } | |
| 264 void do_MemRegion(MemRegion mr); | |
| 265 }; | |
| 266 | |
| 267 // Survivor Chunk Array in support of parallelization of | |
| 268 // Survivor Space rescan. | |
| 6197 | 269 class ChunkArray: public CHeapObj<mtGC> { |
| 0 | 270 size_t _index; |
| 271 size_t _capacity; | |
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272 size_t _overflows; |
| 0 | 273 HeapWord** _array; // storage for array |
| 274 | |
| 275 public: | |
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276 ChunkArray() : _index(0), _capacity(0), _overflows(0), _array(NULL) {} |
| 0 | 277 ChunkArray(HeapWord** a, size_t c): |
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278 _index(0), _capacity(c), _overflows(0), _array(a) {} |
| 0 | 279 |
| 280 HeapWord** array() { return _array; } | |
| 281 void set_array(HeapWord** a) { _array = a; } | |
| 282 | |
| 283 size_t capacity() { return _capacity; } | |
| 284 void set_capacity(size_t c) { _capacity = c; } | |
| 285 | |
| 286 size_t end() { | |
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287 assert(_index <= capacity(), |
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288 err_msg("_index (" SIZE_FORMAT ") > _capacity (" SIZE_FORMAT "): out of bounds", |
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289 _index, _capacity)); |
| 0 | 290 return _index; |
| 291 } // exclusive | |
| 292 | |
| 293 HeapWord* nth(size_t n) { | |
| 294 assert(n < end(), "Out of bounds access"); | |
| 295 return _array[n]; | |
| 296 } | |
| 297 | |
| 298 void reset() { | |
| 299 _index = 0; | |
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300 if (_overflows > 0 && PrintCMSStatistics > 1) { |
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301 warning("CMS: ChunkArray[" SIZE_FORMAT "] overflowed " SIZE_FORMAT " times", |
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302 _capacity, _overflows); |
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303 } |
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304 _overflows = 0; |
| 0 | 305 } |
| 306 | |
| 307 void record_sample(HeapWord* p, size_t sz) { | |
| 308 // For now we do not do anything with the size | |
| 309 if (_index < _capacity) { | |
| 310 _array[_index++] = p; | |
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311 } else { |
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312 ++_overflows; |
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313 assert(_index == _capacity, |
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314 err_msg("_index (" SIZE_FORMAT ") > _capacity (" SIZE_FORMAT |
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315 "): out of bounds at overflow#" SIZE_FORMAT, |
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316 _index, _capacity, _overflows)); |
| 0 | 317 } |
| 318 } | |
| 319 }; | |
| 320 | |
| 321 // | |
| 322 // Timing, allocation and promotion statistics for gc scheduling and incremental | |
| 323 // mode pacing. Most statistics are exponential averages. | |
| 324 // | |
| 325 class CMSStats VALUE_OBJ_CLASS_SPEC { | |
| 326 private: | |
| 327 ConcurrentMarkSweepGeneration* const _cms_gen; // The cms (old) gen. | |
| 328 | |
| 329 // The following are exponential averages with factor alpha: | |
| 330 // avg = (100 - alpha) * avg + alpha * cur_sample | |
| 331 // | |
| 332 // The durations measure: end_time[n] - start_time[n] | |
| 333 // The periods measure: start_time[n] - start_time[n-1] | |
| 334 // | |
| 335 // The cms period and duration include only concurrent collections; time spent | |
| 336 // in foreground cms collections due to System.gc() or because of a failure to | |
| 337 // keep up are not included. | |
| 338 // | |
| 339 // There are 3 alphas to "bootstrap" the statistics. The _saved_alpha is the | |
| 340 // real value, but is used only after the first period. A value of 100 is | |
| 341 // used for the first sample so it gets the entire weight. | |
| 342 unsigned int _saved_alpha; // 0-100 | |
| 343 unsigned int _gc0_alpha; | |
| 344 unsigned int _cms_alpha; | |
| 345 | |
| 346 double _gc0_duration; | |
| 347 double _gc0_period; | |
| 348 size_t _gc0_promoted; // bytes promoted per gc0 | |
| 349 double _cms_duration; | |
| 350 double _cms_duration_pre_sweep; // time from initiation to start of sweep | |
| 351 double _cms_duration_per_mb; | |
| 352 double _cms_period; | |
| 353 size_t _cms_allocated; // bytes of direct allocation per gc0 period | |
| 354 | |
| 355 // Timers. | |
| 356 elapsedTimer _cms_timer; | |
| 357 TimeStamp _gc0_begin_time; | |
| 358 TimeStamp _cms_begin_time; | |
| 359 TimeStamp _cms_end_time; | |
| 360 | |
| 361 // Snapshots of the amount used in the CMS generation. | |
| 362 size_t _cms_used_at_gc0_begin; | |
| 363 size_t _cms_used_at_gc0_end; | |
| 364 size_t _cms_used_at_cms_begin; | |
| 365 | |
| 366 // Used to prevent the duty cycle from being reduced in the middle of a cms | |
| 367 // cycle. | |
| 368 bool _allow_duty_cycle_reduction; | |
| 369 | |
| 370 enum { | |
| 371 _GC0_VALID = 0x1, | |
| 372 _CMS_VALID = 0x2, | |
| 373 _ALL_VALID = _GC0_VALID | _CMS_VALID | |
| 374 }; | |
| 375 | |
| 376 unsigned int _valid_bits; | |
| 377 | |
| 378 unsigned int _icms_duty_cycle; // icms duty cycle (0-100). | |
| 379 | |
| 380 protected: | |
| 381 | |
| 382 // Return a duty cycle that avoids wild oscillations, by limiting the amount | |
| 383 // of change between old_duty_cycle and new_duty_cycle (the latter is treated | |
| 384 // as a recommended value). | |
| 385 static unsigned int icms_damped_duty_cycle(unsigned int old_duty_cycle, | |
| 386 unsigned int new_duty_cycle); | |
| 387 unsigned int icms_update_duty_cycle_impl(); | |
| 388 | |
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389 // In support of adjusting of cms trigger ratios based on history |
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390 // of concurrent mode failure. |
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391 double cms_free_adjustment_factor(size_t free) const; |
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392 void adjust_cms_free_adjustment_factor(bool fail, size_t free); |
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393 |
| 0 | 394 public: |
| 395 CMSStats(ConcurrentMarkSweepGeneration* cms_gen, | |
| 396 unsigned int alpha = CMSExpAvgFactor); | |
| 397 | |
| 398 // Whether or not the statistics contain valid data; higher level statistics | |
| 399 // cannot be called until this returns true (they require at least one young | |
| 400 // gen and one cms cycle to have completed). | |
| 401 bool valid() const; | |
| 402 | |
| 403 // Record statistics. | |
| 404 void record_gc0_begin(); | |
| 405 void record_gc0_end(size_t cms_gen_bytes_used); | |
| 406 void record_cms_begin(); | |
| 407 void record_cms_end(); | |
| 408 | |
| 409 // Allow management of the cms timer, which must be stopped/started around | |
| 410 // yield points. | |
| 411 elapsedTimer& cms_timer() { return _cms_timer; } | |
| 412 void start_cms_timer() { _cms_timer.start(); } | |
| 413 void stop_cms_timer() { _cms_timer.stop(); } | |
| 414 | |
| 415 // Basic statistics; units are seconds or bytes. | |
| 416 double gc0_period() const { return _gc0_period; } | |
| 417 double gc0_duration() const { return _gc0_duration; } | |
| 418 size_t gc0_promoted() const { return _gc0_promoted; } | |
| 419 double cms_period() const { return _cms_period; } | |
| 420 double cms_duration() const { return _cms_duration; } | |
| 421 double cms_duration_per_mb() const { return _cms_duration_per_mb; } | |
| 422 size_t cms_allocated() const { return _cms_allocated; } | |
| 423 | |
| 424 size_t cms_used_at_gc0_end() const { return _cms_used_at_gc0_end;} | |
| 425 | |
| 426 // Seconds since the last background cms cycle began or ended. | |
| 427 double cms_time_since_begin() const; | |
| 428 double cms_time_since_end() const; | |
| 429 | |
| 430 // Higher level statistics--caller must check that valid() returns true before | |
| 431 // calling. | |
| 432 | |
| 433 // Returns bytes promoted per second of wall clock time. | |
| 434 double promotion_rate() const; | |
| 435 | |
| 436 // Returns bytes directly allocated per second of wall clock time. | |
| 437 double cms_allocation_rate() const; | |
| 438 | |
| 439 // Rate at which space in the cms generation is being consumed (sum of the | |
| 440 // above two). | |
| 441 double cms_consumption_rate() const; | |
| 442 | |
| 443 // Returns an estimate of the number of seconds until the cms generation will | |
| 444 // fill up, assuming no collection work is done. | |
| 445 double time_until_cms_gen_full() const; | |
| 446 | |
| 447 // Returns an estimate of the number of seconds remaining until | |
| 448 // the cms generation collection should start. | |
| 449 double time_until_cms_start() const; | |
| 450 | |
| 451 // End of higher level statistics. | |
| 452 | |
| 453 // Returns the cms incremental mode duty cycle, as a percentage (0-100). | |
| 454 unsigned int icms_duty_cycle() const { return _icms_duty_cycle; } | |
| 455 | |
| 456 // Update the duty cycle and return the new value. | |
| 457 unsigned int icms_update_duty_cycle(); | |
| 458 | |
| 459 // Debugging. | |
| 460 void print_on(outputStream* st) const PRODUCT_RETURN; | |
| 461 void print() const { print_on(gclog_or_tty); } | |
| 462 }; | |
| 463 | |
| 464 // A closure related to weak references processing which | |
| 465 // we embed in the CMSCollector, since we need to pass | |
| 466 // it to the reference processor for secondary filtering | |
| 467 // of references based on reachability of referent; | |
| 468 // see role of _is_alive_non_header closure in the | |
| 469 // ReferenceProcessor class. | |
| 470 // For objects in the CMS generation, this closure checks | |
| 471 // if the object is "live" (reachable). Used in weak | |
| 472 // reference processing. | |
| 473 class CMSIsAliveClosure: public BoolObjectClosure { | |
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474 const MemRegion _span; |
| 0 | 475 const CMSBitMap* _bit_map; |
| 476 | |
| 477 friend class CMSCollector; | |
| 478 public: | |
| 479 CMSIsAliveClosure(MemRegion span, | |
| 480 CMSBitMap* bit_map): | |
| 481 _span(span), | |
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482 _bit_map(bit_map) { |
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483 assert(!span.is_empty(), "Empty span could spell trouble"); |
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484 } |
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485 |
| 0 | 486 void do_object(oop obj) { |
| 487 assert(false, "not to be invoked"); | |
| 488 } | |
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489 |
| 0 | 490 bool do_object_b(oop obj); |
| 491 }; | |
| 492 | |
| 493 | |
| 494 // Implements AbstractRefProcTaskExecutor for CMS. | |
| 495 class CMSRefProcTaskExecutor: public AbstractRefProcTaskExecutor { | |
| 496 public: | |
| 497 | |
| 498 CMSRefProcTaskExecutor(CMSCollector& collector) | |
| 499 : _collector(collector) | |
| 500 { } | |
| 501 | |
| 502 // Executes a task using worker threads. | |
| 503 virtual void execute(ProcessTask& task); | |
| 504 virtual void execute(EnqueueTask& task); | |
| 505 private: | |
| 506 CMSCollector& _collector; | |
| 507 }; | |
| 508 | |
| 509 | |
| 6197 | 510 class CMSCollector: public CHeapObj<mtGC> { |
| 0 | 511 friend class VMStructs; |
| 512 friend class ConcurrentMarkSweepThread; | |
| 513 friend class ConcurrentMarkSweepGeneration; | |
| 514 friend class CompactibleFreeListSpace; | |
| 515 friend class CMSParRemarkTask; | |
| 516 friend class CMSConcMarkingTask; | |
| 517 friend class CMSRefProcTaskProxy; | |
| 518 friend class CMSRefProcTaskExecutor; | |
| 519 friend class ScanMarkedObjectsAgainCarefullyClosure; // for sampling eden | |
| 520 friend class SurvivorSpacePrecleanClosure; // --- ditto ------- | |
| 521 friend class PushOrMarkClosure; // to access _restart_addr | |
| 522 friend class Par_PushOrMarkClosure; // to access _restart_addr | |
| 523 friend class MarkFromRootsClosure; // -- ditto -- | |
| 524 // ... and for clearing cards | |
| 525 friend class Par_MarkFromRootsClosure; // to access _restart_addr | |
| 526 // ... and for clearing cards | |
| 527 friend class Par_ConcMarkingClosure; // to access _restart_addr etc. | |
| 528 friend class MarkFromRootsVerifyClosure; // to access _restart_addr | |
| 529 friend class PushAndMarkVerifyClosure; // -- ditto -- | |
| 530 friend class MarkRefsIntoAndScanClosure; // to access _overflow_list | |
| 531 friend class PushAndMarkClosure; // -- ditto -- | |
| 532 friend class Par_PushAndMarkClosure; // -- ditto -- | |
| 533 friend class CMSKeepAliveClosure; // -- ditto -- | |
| 534 friend class CMSDrainMarkingStackClosure; // -- ditto -- | |
| 535 friend class CMSInnerParMarkAndPushClosure; // -- ditto -- | |
| 536 NOT_PRODUCT(friend class ScanMarkedObjectsAgainClosure;) // assertion on _overflow_list | |
| 537 friend class ReleaseForegroundGC; // to access _foregroundGCShouldWait | |
| 538 friend class VM_CMS_Operation; | |
| 539 friend class VM_CMS_Initial_Mark; | |
| 540 friend class VM_CMS_Final_Remark; | |
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541 friend class TraceCMSMemoryManagerStats; |
| 0 | 542 |
| 543 private: | |
| 544 jlong _time_of_last_gc; | |
| 545 void update_time_of_last_gc(jlong now) { | |
| 546 _time_of_last_gc = now; | |
| 547 } | |
| 548 | |
| 549 OopTaskQueueSet* _task_queues; | |
| 550 | |
| 551 // Overflow list of grey objects, threaded through mark-word | |
| 552 // Manipulated with CAS in the parallel/multi-threaded case. | |
| 553 oop _overflow_list; | |
| 554 // The following array-pair keeps track of mark words | |
| 555 // displaced for accomodating overflow list above. | |
| 556 // This code will likely be revisited under RFE#4922830. | |
| 6197 | 557 Stack<oop, mtGC> _preserved_oop_stack; |
| 558 Stack<markOop, mtGC> _preserved_mark_stack; | |
| 0 | 559 |
| 560 int* _hash_seed; | |
| 561 | |
| 562 // In support of multi-threaded concurrent phases | |
| 563 YieldingFlexibleWorkGang* _conc_workers; | |
| 564 | |
| 565 // Performance Counters | |
| 566 CollectorCounters* _gc_counters; | |
| 567 | |
| 568 // Initialization Errors | |
| 569 bool _completed_initialization; | |
| 570 | |
| 571 // In support of ExplicitGCInvokesConcurrent | |
| 572 static bool _full_gc_requested; | |
| 573 unsigned int _collection_count_start; | |
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574 |
| 0 | 575 // Should we unload classes this concurrent cycle? |
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576 bool _should_unload_classes; |
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577 unsigned int _concurrent_cycles_since_last_unload; |
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578 unsigned int concurrent_cycles_since_last_unload() const { |
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579 return _concurrent_cycles_since_last_unload; |
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580 } |
| 0 | 581 // Did we (allow) unload classes in the previous concurrent cycle? |
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582 bool unloaded_classes_last_cycle() const { |
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583 return concurrent_cycles_since_last_unload() == 0; |
| 0 | 584 } |
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585 // Root scanning options for perm gen |
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586 int _roots_scanning_options; |
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587 int roots_scanning_options() const { return _roots_scanning_options; } |
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588 void add_root_scanning_option(int o) { _roots_scanning_options |= o; } |
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589 void remove_root_scanning_option(int o) { _roots_scanning_options &= ~o; } |
| 0 | 590 |
| 591 // Verification support | |
| 592 CMSBitMap _verification_mark_bm; | |
| 593 void verify_after_remark_work_1(); | |
| 594 void verify_after_remark_work_2(); | |
| 595 | |
| 596 // true if any verification flag is on. | |
| 597 bool _verifying; | |
| 598 bool verifying() const { return _verifying; } | |
| 599 void set_verifying(bool v) { _verifying = v; } | |
| 600 | |
| 601 // Collector policy | |
| 602 ConcurrentMarkSweepPolicy* _collector_policy; | |
| 603 ConcurrentMarkSweepPolicy* collector_policy() { return _collector_policy; } | |
| 604 | |
| 605 // XXX Move these to CMSStats ??? FIX ME !!! | |
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606 elapsedTimer _inter_sweep_timer; // time between sweeps |
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607 elapsedTimer _intra_sweep_timer; // time _in_ sweeps |
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608 // padded decaying average estimates of the above |
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609 AdaptivePaddedAverage _inter_sweep_estimate; |
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610 AdaptivePaddedAverage _intra_sweep_estimate; |
| 0 | 611 |
| 612 protected: | |
| 613 ConcurrentMarkSweepGeneration* _cmsGen; // old gen (CMS) | |
| 614 MemRegion _span; // span covering above two | |
| 615 CardTableRS* _ct; // card table | |
| 616 | |
| 617 // CMS marking support structures | |
| 618 CMSBitMap _markBitMap; | |
| 619 CMSBitMap _modUnionTable; | |
| 620 CMSMarkStack _markStack; | |
| 621 | |
| 622 HeapWord* _restart_addr; // in support of marking stack overflow | |
| 623 void lower_restart_addr(HeapWord* low); | |
| 624 | |
| 625 // Counters in support of marking stack / work queue overflow handling: | |
| 626 // a non-zero value indicates certain types of overflow events during | |
| 627 // the current CMS cycle and could lead to stack resizing efforts at | |
| 628 // an opportune future time. | |
| 629 size_t _ser_pmc_preclean_ovflw; | |
| 630 size_t _ser_pmc_remark_ovflw; | |
| 631 size_t _par_pmc_remark_ovflw; | |
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632 size_t _ser_kac_preclean_ovflw; |
| 0 | 633 size_t _ser_kac_ovflw; |
| 634 size_t _par_kac_ovflw; | |
| 534 | 635 NOT_PRODUCT(ssize_t _num_par_pushes;) |
| 0 | 636 |
| 637 // ("Weak") Reference processing support | |
| 638 ReferenceProcessor* _ref_processor; | |
| 639 CMSIsAliveClosure _is_alive_closure; | |
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640 // keep this textually after _markBitMap and _span; c'tor dependency |
| 0 | 641 |
| 642 ConcurrentMarkSweepThread* _cmsThread; // the thread doing the work | |
| 643 ModUnionClosure _modUnionClosure; | |
| 644 ModUnionClosurePar _modUnionClosurePar; | |
| 645 | |
| 646 // CMS abstract state machine | |
| 647 // initial_state: Idling | |
| 648 // next_state(Idling) = {Marking} | |
| 649 // next_state(Marking) = {Precleaning, Sweeping} | |
| 650 // next_state(Precleaning) = {AbortablePreclean, FinalMarking} | |
| 651 // next_state(AbortablePreclean) = {FinalMarking} | |
| 652 // next_state(FinalMarking) = {Sweeping} | |
| 653 // next_state(Sweeping) = {Resizing} | |
| 654 // next_state(Resizing) = {Resetting} | |
| 655 // next_state(Resetting) = {Idling} | |
| 656 // The numeric values below are chosen so that: | |
| 657 // . _collectorState <= Idling == post-sweep && pre-mark | |
| 658 // . _collectorState in (Idling, Sweeping) == {initial,final}marking || | |
| 659 // precleaning || abortablePrecleanb | |
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660 public: |
| 0 | 661 enum CollectorState { |
| 662 Resizing = 0, | |
| 663 Resetting = 1, | |
| 664 Idling = 2, | |
| 665 InitialMarking = 3, | |
| 666 Marking = 4, | |
| 667 Precleaning = 5, | |
| 668 AbortablePreclean = 6, | |
| 669 FinalMarking = 7, | |
| 670 Sweeping = 8 | |
| 671 }; | |
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672 protected: |
| 0 | 673 static CollectorState _collectorState; |
| 674 | |
| 675 // State related to prologue/epilogue invocation for my generations | |
| 676 bool _between_prologue_and_epilogue; | |
| 677 | |
| 678 // Signalling/State related to coordination between fore- and backgroud GC | |
| 679 // Note: When the baton has been passed from background GC to foreground GC, | |
| 680 // _foregroundGCIsActive is true and _foregroundGCShouldWait is false. | |
| 681 static bool _foregroundGCIsActive; // true iff foreground collector is active or | |
| 682 // wants to go active | |
| 683 static bool _foregroundGCShouldWait; // true iff background GC is active and has not | |
| 684 // yet passed the baton to the foreground GC | |
| 685 | |
| 686 // Support for CMSScheduleRemark (abortable preclean) | |
| 687 bool _abort_preclean; | |
| 688 bool _start_sampling; | |
| 689 | |
| 690 int _numYields; | |
| 691 size_t _numDirtyCards; | |
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692 size_t _sweep_count; |
| 0 | 693 // number of full gc's since the last concurrent gc. |
| 694 uint _full_gcs_since_conc_gc; | |
| 695 | |
| 696 // occupancy used for bootstrapping stats | |
| 697 double _bootstrap_occupancy; | |
| 698 | |
| 699 // timer | |
| 700 elapsedTimer _timer; | |
| 701 | |
| 702 // Timing, allocation and promotion statistics, used for scheduling. | |
| 703 CMSStats _stats; | |
| 704 | |
| 705 // Allocation limits installed in the young gen, used only in | |
| 706 // CMSIncrementalMode. When an allocation in the young gen would cross one of | |
| 707 // these limits, the cms generation is notified and the cms thread is started | |
| 708 // or stopped, respectively. | |
| 709 HeapWord* _icms_start_limit; | |
| 710 HeapWord* _icms_stop_limit; | |
| 711 | |
| 712 enum CMS_op_type { | |
| 713 CMS_op_checkpointRootsInitial, | |
| 714 CMS_op_checkpointRootsFinal | |
| 715 }; | |
| 716 | |
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717 void do_CMS_operation(CMS_op_type op, GCCause::Cause gc_cause); |
| 0 | 718 bool stop_world_and_do(CMS_op_type op); |
| 719 | |
| 720 OopTaskQueueSet* task_queues() { return _task_queues; } | |
| 721 int* hash_seed(int i) { return &_hash_seed[i]; } | |
| 722 YieldingFlexibleWorkGang* conc_workers() { return _conc_workers; } | |
| 723 | |
| 724 // Support for parallelizing Eden rescan in CMS remark phase | |
| 725 void sample_eden(); // ... sample Eden space top | |
| 726 | |
| 727 private: | |
| 728 // Support for parallelizing young gen rescan in CMS remark phase | |
| 729 Generation* _young_gen; // the younger gen | |
| 730 HeapWord** _top_addr; // ... Top of Eden | |
| 731 HeapWord** _end_addr; // ... End of Eden | |
| 732 HeapWord** _eden_chunk_array; // ... Eden partitioning array | |
| 733 size_t _eden_chunk_index; // ... top (exclusive) of array | |
| 734 size_t _eden_chunk_capacity; // ... max entries in array | |
| 735 | |
| 736 // Support for parallelizing survivor space rescan | |
| 737 HeapWord** _survivor_chunk_array; | |
| 738 size_t _survivor_chunk_index; | |
| 739 size_t _survivor_chunk_capacity; | |
| 740 size_t* _cursor; | |
| 741 ChunkArray* _survivor_plab_array; | |
| 742 | |
| 743 // Support for marking stack overflow handling | |
| 744 bool take_from_overflow_list(size_t num, CMSMarkStack* to_stack); | |
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745 bool par_take_from_overflow_list(size_t num, |
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746 OopTaskQueue* to_work_q, |
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747 int no_of_gc_threads); |
| 0 | 748 void push_on_overflow_list(oop p); |
| 749 void par_push_on_overflow_list(oop p); | |
| 750 // the following is, obviously, not, in general, "MT-stable" | |
| 751 bool overflow_list_is_empty() const; | |
| 752 | |
| 753 void preserve_mark_if_necessary(oop p); | |
| 754 void par_preserve_mark_if_necessary(oop p); | |
| 755 void preserve_mark_work(oop p, markOop m); | |
| 756 void restore_preserved_marks_if_any(); | |
| 757 NOT_PRODUCT(bool no_preserved_marks() const;) | |
| 758 // in support of testing overflow code | |
| 759 NOT_PRODUCT(int _overflow_counter;) | |
| 760 NOT_PRODUCT(bool simulate_overflow();) // sequential | |
| 761 NOT_PRODUCT(bool par_simulate_overflow();) // MT version | |
| 762 | |
| 763 // CMS work methods | |
| 764 void checkpointRootsInitialWork(bool asynch); // initial checkpoint work | |
| 765 | |
| 766 // a return value of false indicates failure due to stack overflow | |
| 767 bool markFromRootsWork(bool asynch); // concurrent marking work | |
| 768 | |
| 769 public: // FIX ME!!! only for testing | |
| 770 bool do_marking_st(bool asynch); // single-threaded marking | |
| 771 bool do_marking_mt(bool asynch); // multi-threaded marking | |
| 772 | |
| 773 private: | |
| 774 | |
| 775 // concurrent precleaning work | |
| 776 size_t preclean_mod_union_table(ConcurrentMarkSweepGeneration* gen, | |
| 777 ScanMarkedObjectsAgainCarefullyClosure* cl); | |
| 778 size_t preclean_card_table(ConcurrentMarkSweepGeneration* gen, | |
| 779 ScanMarkedObjectsAgainCarefullyClosure* cl); | |
| 780 // Does precleaning work, returning a quantity indicative of | |
| 781 // the amount of "useful work" done. | |
| 782 size_t preclean_work(bool clean_refs, bool clean_survivors); | |
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783 void preclean_klasses(MarkRefsIntoAndScanClosure* cl, Mutex* freelistLock); |
| 0 | 784 void abortable_preclean(); // Preclean while looking for possible abort |
| 785 void initialize_sequential_subtasks_for_young_gen_rescan(int i); | |
| 786 // Helper function for above; merge-sorts the per-thread plab samples | |
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787 void merge_survivor_plab_arrays(ContiguousSpace* surv, int no_of_gc_threads); |
| 0 | 788 // Resets (i.e. clears) the per-thread plab sample vectors |
| 789 void reset_survivor_plab_arrays(); | |
| 790 | |
| 791 // final (second) checkpoint work | |
| 792 void checkpointRootsFinalWork(bool asynch, bool clear_all_soft_refs, | |
| 793 bool init_mark_was_synchronous); | |
| 794 // work routine for parallel version of remark | |
| 795 void do_remark_parallel(); | |
| 796 // work routine for non-parallel version of remark | |
| 797 void do_remark_non_parallel(); | |
| 798 // reference processing work routine (during second checkpoint) | |
| 799 void refProcessingWork(bool asynch, bool clear_all_soft_refs); | |
| 800 | |
| 801 // concurrent sweeping work | |
| 802 void sweepWork(ConcurrentMarkSweepGeneration* gen, bool asynch); | |
| 803 | |
| 804 // (concurrent) resetting of support data structures | |
| 805 void reset(bool asynch); | |
| 806 | |
| 807 // Clear _expansion_cause fields of constituent generations | |
| 808 void clear_expansion_cause(); | |
| 809 | |
| 810 // An auxilliary method used to record the ends of | |
| 811 // used regions of each generation to limit the extent of sweep | |
| 812 void save_sweep_limits(); | |
| 813 | |
| 814 // A work method used by foreground collection to determine | |
| 815 // what type of collection (compacting or not, continuing or fresh) | |
| 816 // it should do. | |
| 817 void decide_foreground_collection_type(bool clear_all_soft_refs, | |
| 818 bool* should_compact, bool* should_start_over); | |
| 819 | |
| 820 // A work method used by the foreground collector to do | |
| 821 // a mark-sweep-compact. | |
| 822 void do_compaction_work(bool clear_all_soft_refs); | |
| 823 | |
| 824 // A work method used by the foreground collector to do | |
| 825 // a mark-sweep, after taking over from a possibly on-going | |
| 826 // concurrent mark-sweep collection. | |
| 827 void do_mark_sweep_work(bool clear_all_soft_refs, | |
| 828 CollectorState first_state, bool should_start_over); | |
| 829 | |
| 830 // If the backgrould GC is active, acquire control from the background | |
| 831 // GC and do the collection. | |
| 832 void acquire_control_and_collect(bool full, bool clear_all_soft_refs); | |
| 833 | |
| 834 // For synchronizing passing of control from background to foreground | |
| 835 // GC. waitForForegroundGC() is called by the background | |
| 836 // collector. It if had to wait for a foreground collection, | |
| 837 // it returns true and the background collection should assume | |
| 838 // that the collection was finished by the foreground | |
| 839 // collector. | |
| 840 bool waitForForegroundGC(); | |
| 841 | |
| 842 // Incremental mode triggering: recompute the icms duty cycle and set the | |
| 843 // allocation limits in the young gen. | |
| 844 void icms_update_allocation_limits(); | |
| 845 | |
| 846 size_t block_size_using_printezis_bits(HeapWord* addr) const; | |
| 847 size_t block_size_if_printezis_bits(HeapWord* addr) const; | |
| 848 HeapWord* next_card_start_after_block(HeapWord* addr) const; | |
| 849 | |
| 850 void setup_cms_unloading_and_verification_state(); | |
| 851 public: | |
| 852 CMSCollector(ConcurrentMarkSweepGeneration* cmsGen, | |
| 853 CardTableRS* ct, | |
| 854 ConcurrentMarkSweepPolicy* cp); | |
| 855 ConcurrentMarkSweepThread* cmsThread() { return _cmsThread; } | |
| 856 | |
| 857 ReferenceProcessor* ref_processor() { return _ref_processor; } | |
| 858 void ref_processor_init(); | |
| 859 | |
| 860 Mutex* bitMapLock() const { return _markBitMap.lock(); } | |
| 861 static CollectorState abstract_state() { return _collectorState; } | |
| 862 | |
| 863 bool should_abort_preclean() const; // Whether preclean should be aborted. | |
| 864 size_t get_eden_used() const; | |
| 865 size_t get_eden_capacity() const; | |
| 866 | |
| 867 ConcurrentMarkSweepGeneration* cmsGen() { return _cmsGen; } | |
| 868 | |
| 869 // locking checks | |
| 870 NOT_PRODUCT(static bool have_cms_token();) | |
| 871 | |
| 872 // XXXPERM bool should_collect(bool full, size_t size, bool tlab); | |
| 873 bool shouldConcurrentCollect(); | |
| 874 | |
| 875 void collect(bool full, | |
| 876 bool clear_all_soft_refs, | |
| 877 size_t size, | |
| 878 bool tlab); | |
| 879 void collect_in_background(bool clear_all_soft_refs); | |
| 880 void collect_in_foreground(bool clear_all_soft_refs); | |
| 881 | |
| 882 // In support of ExplicitGCInvokesConcurrent | |
| 883 static void request_full_gc(unsigned int full_gc_count); | |
| 884 // Should we unload classes in a particular concurrent cycle? | |
|
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885 bool should_unload_classes() const { |
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886 return _should_unload_classes; |
| 0 | 887 } |
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888 void update_should_unload_classes(); |
| 0 | 889 |
| 890 void direct_allocated(HeapWord* start, size_t size); | |
| 891 | |
| 892 // Object is dead if not marked and current phase is sweeping. | |
| 893 bool is_dead_obj(oop obj) const; | |
| 894 | |
| 895 // After a promotion (of "start"), do any necessary marking. | |
| 896 // If "par", then it's being done by a parallel GC thread. | |
| 897 // The last two args indicate if we need precise marking | |
| 898 // and if so the size of the object so it can be dirtied | |
| 899 // in its entirety. | |
| 900 void promoted(bool par, HeapWord* start, | |
| 901 bool is_obj_array, size_t obj_size); | |
| 902 | |
| 903 HeapWord* allocation_limit_reached(Space* space, HeapWord* top, | |
| 904 size_t word_size); | |
| 905 | |
| 906 void getFreelistLocks() const; | |
| 907 void releaseFreelistLocks() const; | |
| 908 bool haveFreelistLocks() const; | |
| 909 | |
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910 // Adjust size of underlying generation |
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911 void compute_new_size(); |
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912 |
| 0 | 913 // GC prologue and epilogue |
| 914 void gc_prologue(bool full); | |
| 915 void gc_epilogue(bool full); | |
| 916 | |
| 917 jlong time_of_last_gc(jlong now) { | |
| 918 if (_collectorState <= Idling) { | |
| 919 // gc not in progress | |
| 920 return _time_of_last_gc; | |
| 921 } else { | |
| 922 // collection in progress | |
| 923 return now; | |
| 924 } | |
| 925 } | |
| 926 | |
| 927 // Support for parallel remark of survivor space | |
| 928 void* get_data_recorder(int thr_num); | |
| 929 | |
| 930 CMSBitMap* markBitMap() { return &_markBitMap; } | |
| 931 void directAllocated(HeapWord* start, size_t size); | |
| 932 | |
| 933 // main CMS steps and related support | |
| 934 void checkpointRootsInitial(bool asynch); | |
| 935 bool markFromRoots(bool asynch); // a return value of false indicates failure | |
| 936 // due to stack overflow | |
| 937 void preclean(); | |
| 938 void checkpointRootsFinal(bool asynch, bool clear_all_soft_refs, | |
| 939 bool init_mark_was_synchronous); | |
| 940 void sweep(bool asynch); | |
| 941 | |
| 942 // Check that the currently executing thread is the expected | |
| 943 // one (foreground collector or background collector). | |
|
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944 static void check_correct_thread_executing() PRODUCT_RETURN; |
| 0 | 945 // XXXPERM void print_statistics() PRODUCT_RETURN; |
| 946 | |
| 947 bool is_cms_reachable(HeapWord* addr); | |
| 948 | |
| 949 // Performance Counter Support | |
| 950 CollectorCounters* counters() { return _gc_counters; } | |
| 951 | |
| 952 // timer stuff | |
| 953 void startTimer() { assert(!_timer.is_active(), "Error"); _timer.start(); } | |
| 954 void stopTimer() { assert( _timer.is_active(), "Error"); _timer.stop(); } | |
| 955 void resetTimer() { assert(!_timer.is_active(), "Error"); _timer.reset(); } | |
| 956 double timerValue() { assert(!_timer.is_active(), "Error"); return _timer.seconds(); } | |
| 957 | |
| 958 int yields() { return _numYields; } | |
| 959 void resetYields() { _numYields = 0; } | |
| 960 void incrementYields() { _numYields++; } | |
| 961 void resetNumDirtyCards() { _numDirtyCards = 0; } | |
| 962 void incrementNumDirtyCards(size_t num) { _numDirtyCards += num; } | |
| 963 size_t numDirtyCards() { return _numDirtyCards; } | |
| 964 | |
| 965 static bool foregroundGCShouldWait() { return _foregroundGCShouldWait; } | |
| 966 static void set_foregroundGCShouldWait(bool v) { _foregroundGCShouldWait = v; } | |
| 967 static bool foregroundGCIsActive() { return _foregroundGCIsActive; } | |
| 968 static void set_foregroundGCIsActive(bool v) { _foregroundGCIsActive = v; } | |
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969 size_t sweep_count() const { return _sweep_count; } |
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970 void increment_sweep_count() { _sweep_count++; } |
| 0 | 971 |
| 972 // Timers/stats for gc scheduling and incremental mode pacing. | |
| 973 CMSStats& stats() { return _stats; } | |
| 974 | |
| 975 // Convenience methods that check whether CMSIncrementalMode is enabled and | |
| 976 // forward to the corresponding methods in ConcurrentMarkSweepThread. | |
| 977 static void start_icms(); | |
| 978 static void stop_icms(); // Called at the end of the cms cycle. | |
| 979 static void disable_icms(); // Called before a foreground collection. | |
| 980 static void enable_icms(); // Called after a foreground collection. | |
| 981 void icms_wait(); // Called at yield points. | |
| 982 | |
| 983 // Adaptive size policy | |
| 984 CMSAdaptiveSizePolicy* size_policy(); | |
| 985 CMSGCAdaptivePolicyCounters* gc_adaptive_policy_counters(); | |
| 986 | |
| 987 // debugging | |
| 6008 | 988 void verify(); |
| 0 | 989 bool verify_after_remark(); |
| 990 void verify_ok_to_terminate() const PRODUCT_RETURN; | |
| 991 void verify_work_stacks_empty() const PRODUCT_RETURN; | |
| 992 void verify_overflow_empty() const PRODUCT_RETURN; | |
| 993 | |
| 994 // convenience methods in support of debugging | |
| 995 static const size_t skip_header_HeapWords() PRODUCT_RETURN0; | |
| 996 HeapWord* block_start(const void* p) const PRODUCT_RETURN0; | |
| 997 | |
| 998 // accessors | |
| 999 CMSMarkStack* verification_mark_stack() { return &_markStack; } | |
| 1000 CMSBitMap* verification_mark_bm() { return &_verification_mark_bm; } | |
| 1001 | |
| 1002 // Initialization errors | |
| 1003 bool completed_initialization() { return _completed_initialization; } | |
| 1004 }; | |
| 1005 | |
| 1006 class CMSExpansionCause : public AllStatic { | |
| 1007 public: | |
| 1008 enum Cause { | |
| 1009 _no_expansion, | |
| 1010 _satisfy_free_ratio, | |
| 1011 _satisfy_promotion, | |
| 1012 _satisfy_allocation, | |
| 1013 _allocate_par_lab, | |
| 1014 _allocate_par_spooling_space, | |
| 1015 _adaptive_size_policy | |
| 1016 }; | |
| 1017 // Return a string describing the cause of the expansion. | |
| 1018 static const char* to_string(CMSExpansionCause::Cause cause); | |
| 1019 }; | |
| 1020 | |
| 1021 class ConcurrentMarkSweepGeneration: public CardGeneration { | |
| 1022 friend class VMStructs; | |
| 1023 friend class ConcurrentMarkSweepThread; | |
| 1024 friend class ConcurrentMarkSweep; | |
| 1025 friend class CMSCollector; | |
| 1026 protected: | |
| 1027 static CMSCollector* _collector; // the collector that collects us | |
| 1028 CompactibleFreeListSpace* _cmsSpace; // underlying space (only one for now) | |
| 1029 | |
| 1030 // Performance Counters | |
| 1031 GenerationCounters* _gen_counters; | |
| 1032 GSpaceCounters* _space_counters; | |
| 1033 | |
| 1034 // Words directly allocated, used by CMSStats. | |
| 1035 size_t _direct_allocated_words; | |
| 1036 | |
| 1037 // Non-product stat counters | |
| 1038 NOT_PRODUCT( | |
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1039 size_t _numObjectsPromoted; |
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1040 size_t _numWordsPromoted; |
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1041 size_t _numObjectsAllocated; |
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1042 size_t _numWordsAllocated; |
| 0 | 1043 ) |
| 1044 | |
| 1045 // Used for sizing decisions | |
| 1046 bool _incremental_collection_failed; | |
| 1047 bool incremental_collection_failed() { | |
| 1048 return _incremental_collection_failed; | |
| 1049 } | |
| 1050 void set_incremental_collection_failed() { | |
| 1051 _incremental_collection_failed = true; | |
| 1052 } | |
| 1053 void clear_incremental_collection_failed() { | |
| 1054 _incremental_collection_failed = false; | |
| 1055 } | |
| 1056 | |
|
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1057 // accessors |
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1058 void set_expansion_cause(CMSExpansionCause::Cause v) { _expansion_cause = v;} |
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1059 CMSExpansionCause::Cause expansion_cause() const { return _expansion_cause; } |
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1060 |
| 0 | 1061 private: |
| 1062 // For parallel young-gen GC support. | |
| 1063 CMSParGCThreadState** _par_gc_thread_states; | |
| 1064 | |
| 1065 // Reason generation was expanded | |
| 1066 CMSExpansionCause::Cause _expansion_cause; | |
| 1067 | |
| 1068 // In support of MinChunkSize being larger than min object size | |
| 1069 const double _dilatation_factor; | |
| 1070 | |
| 1071 enum CollectionTypes { | |
| 1072 Concurrent_collection_type = 0, | |
| 1073 MS_foreground_collection_type = 1, | |
| 1074 MSC_foreground_collection_type = 2, | |
| 1075 Unknown_collection_type = 3 | |
| 1076 }; | |
| 1077 | |
| 1078 CollectionTypes _debug_collection_type; | |
| 1079 | |
|
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1080 // Fraction of current occupancy at which to start a CMS collection which |
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1081 // will collect this generation (at least). |
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1082 double _initiating_occupancy; |
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1083 |
| 0 | 1084 protected: |
| 1085 // Shrink generation by specified size (returns false if unable to shrink) | |
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1086 void shrink_free_list_by(size_t bytes); |
| 0 | 1087 |
| 1088 // Update statistics for GC | |
| 1089 virtual void update_gc_stats(int level, bool full); | |
| 1090 | |
| 1091 // Maximum available space in the generation (including uncommitted) | |
| 1092 // space. | |
| 1093 size_t max_available() const; | |
| 1094 | |
|
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1095 // getter and initializer for _initiating_occupancy field. |
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1096 double initiating_occupancy() const { return _initiating_occupancy; } |
| 8035 | 1097 void init_initiating_occupancy(intx io, uintx tr); |
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1098 |
| 0 | 1099 public: |
| 1100 ConcurrentMarkSweepGeneration(ReservedSpace rs, size_t initial_byte_size, | |
| 1101 int level, CardTableRS* ct, | |
| 1102 bool use_adaptive_freelists, | |
| 6026 | 1103 FreeBlockDictionary<FreeChunk>::DictionaryChoice); |
| 0 | 1104 |
| 1105 // Accessors | |
| 1106 CMSCollector* collector() const { return _collector; } | |
| 1107 static void set_collector(CMSCollector* collector) { | |
| 1108 assert(_collector == NULL, "already set"); | |
| 1109 _collector = collector; | |
| 1110 } | |
| 1111 CompactibleFreeListSpace* cmsSpace() const { return _cmsSpace; } | |
| 1112 | |
| 1113 Mutex* freelistLock() const; | |
| 1114 | |
| 1115 virtual Generation::Name kind() { return Generation::ConcurrentMarkSweep; } | |
| 1116 | |
| 1117 // Adaptive size policy | |
| 1118 CMSAdaptiveSizePolicy* size_policy(); | |
| 1119 | |
| 1120 bool refs_discovery_is_atomic() const { return false; } | |
| 1121 bool refs_discovery_is_mt() const { | |
| 1122 // Note: CMS does MT-discovery during the parallel-remark | |
| 1123 // phases. Use ReferenceProcessorMTMutator to make refs | |
| 1124 // discovery MT-safe during such phases or other parallel | |
| 1125 // discovery phases in the future. This may all go away | |
| 1126 // if/when we decide that refs discovery is sufficiently | |
| 1127 // rare that the cost of the CAS's involved is in the | |
| 1128 // noise. That's a measurement that should be done, and | |
| 1129 // the code simplified if that turns out to be the case. | |
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1130 return ConcGCThreads > 1; |
| 0 | 1131 } |
| 1132 | |
| 1133 // Override | |
| 1134 virtual void ref_processor_init(); | |
| 1135 | |
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1136 // Grow generation by specified size (returns false if unable to grow) |
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1137 bool grow_by(size_t bytes); |
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1138 // Grow generation to reserved size. |
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1139 bool grow_to_reserved(); |
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1140 |
| 0 | 1141 void clear_expansion_cause() { _expansion_cause = CMSExpansionCause::_no_expansion; } |
| 1142 | |
| 1143 // Space enquiries | |
| 1144 size_t capacity() const; | |
| 1145 size_t used() const; | |
| 1146 size_t free() const; | |
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1147 double occupancy() const { return ((double)used())/((double)capacity()); } |
| 0 | 1148 size_t contiguous_available() const; |
| 1149 size_t unsafe_max_alloc_nogc() const; | |
| 1150 | |
| 1151 // over-rides | |
| 1152 MemRegion used_region() const; | |
| 1153 MemRegion used_region_at_save_marks() const; | |
| 1154 | |
| 1155 // Does a "full" (forced) collection invoked on this generation collect | |
| 1156 // all younger generations as well? Note that the second conjunct is a | |
| 1157 // hack to allow the collection of the younger gen first if the flag is | |
| 1158 // set. This is better than using th policy's should_collect_gen0_first() | |
| 1159 // since that causes us to do an extra unnecessary pair of restart-&-stop-world. | |
| 1160 virtual bool full_collects_younger_generations() const { | |
| 1161 return UseCMSCompactAtFullCollection && !CollectGen0First; | |
| 1162 } | |
| 1163 | |
| 1164 void space_iterate(SpaceClosure* blk, bool usedOnly = false); | |
| 1165 | |
| 1166 // Support for compaction | |
| 1167 CompactibleSpace* first_compaction_space() const; | |
| 1168 // Adjust quantites in the generation affected by | |
| 1169 // the compaction. | |
| 1170 void reset_after_compaction(); | |
| 1171 | |
| 1172 // Allocation support | |
| 1173 HeapWord* allocate(size_t size, bool tlab); | |
| 1174 HeapWord* have_lock_and_allocate(size_t size, bool tlab); | |
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1175 oop promote(oop obj, size_t obj_size); |
| 0 | 1176 HeapWord* par_allocate(size_t size, bool tlab) { |
| 1177 return allocate(size, tlab); | |
| 1178 } | |
| 1179 | |
| 1180 // Incremental mode triggering. | |
| 1181 HeapWord* allocation_limit_reached(Space* space, HeapWord* top, | |
| 1182 size_t word_size); | |
| 1183 | |
| 1184 // Used by CMSStats to track direct allocation. The value is sampled and | |
| 1185 // reset after each young gen collection. | |
| 1186 size_t direct_allocated_words() const { return _direct_allocated_words; } | |
| 1187 void reset_direct_allocated_words() { _direct_allocated_words = 0; } | |
| 1188 | |
| 1189 // Overrides for parallel promotion. | |
| 1190 virtual oop par_promote(int thread_num, | |
| 1191 oop obj, markOop m, size_t word_sz); | |
| 1192 // This one should not be called for CMS. | |
| 1193 virtual void par_promote_alloc_undo(int thread_num, | |
| 1194 HeapWord* obj, size_t word_sz); | |
| 1195 virtual void par_promote_alloc_done(int thread_num); | |
| 1196 virtual void par_oop_since_save_marks_iterate_done(int thread_num); | |
| 1197 | |
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1198 virtual bool promotion_attempt_is_safe(size_t promotion_in_bytes) const; |
| 0 | 1199 |
|
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1200 // Inform this (non-young) generation that a promotion failure was |
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1201 // encountered during a collection of a younger generation that |
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1202 // promotes into this generation. |
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1203 virtual void promotion_failure_occurred(); |
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1204 |
| 0 | 1205 bool should_collect(bool full, size_t size, bool tlab); |
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1206 virtual bool should_concurrent_collect() const; |
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1207 virtual bool is_too_full() const; |
| 0 | 1208 void collect(bool full, |
| 1209 bool clear_all_soft_refs, | |
| 1210 size_t size, | |
| 1211 bool tlab); | |
| 1212 | |
| 1213 HeapWord* expand_and_allocate(size_t word_size, | |
| 1214 bool tlab, | |
| 1215 bool parallel = false); | |
| 1216 | |
| 1217 // GC prologue and epilogue | |
| 1218 void gc_prologue(bool full); | |
| 1219 void gc_prologue_work(bool full, bool registerClosure, | |
| 1220 ModUnionClosure* modUnionClosure); | |
| 1221 void gc_epilogue(bool full); | |
| 1222 void gc_epilogue_work(bool full); | |
| 1223 | |
| 1224 // Time since last GC of this generation | |
| 1225 jlong time_of_last_gc(jlong now) { | |
| 1226 return collector()->time_of_last_gc(now); | |
| 1227 } | |
| 1228 void update_time_of_last_gc(jlong now) { | |
| 1229 collector()-> update_time_of_last_gc(now); | |
| 1230 } | |
| 1231 | |
| 1232 // Allocation failure | |
| 1233 void expand(size_t bytes, size_t expand_bytes, | |
| 1234 CMSExpansionCause::Cause cause); | |
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1235 virtual bool expand(size_t bytes, size_t expand_bytes); |
| 0 | 1236 void shrink(size_t bytes); |
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1237 void shrink_by(size_t bytes); |
| 0 | 1238 HeapWord* expand_and_par_lab_allocate(CMSParGCThreadState* ps, size_t word_sz); |
| 1239 bool expand_and_ensure_spooling_space(PromotionInfo* promo); | |
| 1240 | |
| 1241 // Iteration support and related enquiries | |
| 1242 void save_marks(); | |
| 1243 bool no_allocs_since_save_marks(); | |
| 1244 void object_iterate_since_last_GC(ObjectClosure* cl); | |
| 1245 void younger_refs_iterate(OopsInGenClosure* cl); | |
| 1246 | |
| 1247 // Iteration support specific to CMS generations | |
| 1248 void save_sweep_limit(); | |
| 1249 | |
| 1250 // More iteration support | |
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1251 virtual void oop_iterate(MemRegion mr, ExtendedOopClosure* cl); |
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1252 virtual void oop_iterate(ExtendedOopClosure* cl); |
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1253 virtual void safe_object_iterate(ObjectClosure* cl); |
| 0 | 1254 virtual void object_iterate(ObjectClosure* cl); |
| 1255 | |
| 1256 // Need to declare the full complement of closures, whether we'll | |
| 1257 // override them or not, or get message from the compiler: | |
| 1258 // oop_since_save_marks_iterate_nv hides virtual function... | |
| 1259 #define CMS_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \ | |
| 1260 void oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl); | |
| 1261 ALL_SINCE_SAVE_MARKS_CLOSURES(CMS_SINCE_SAVE_MARKS_DECL) | |
| 1262 | |
| 1263 // Smart allocation XXX -- move to CFLSpace? | |
| 1264 void setNearLargestChunk(); | |
| 1265 bool isNearLargestChunk(HeapWord* addr); | |
| 1266 | |
| 1267 // Get the chunk at the end of the space. Delagates to | |
| 1268 // the space. | |
| 1269 FreeChunk* find_chunk_at_end(); | |
| 1270 | |
| 1271 void post_compact(); | |
| 1272 | |
| 1273 // Debugging | |
| 1274 void prepare_for_verify(); | |
| 6008 | 1275 void verify(); |
| 0 | 1276 void print_statistics() PRODUCT_RETURN; |
| 1277 | |
| 1278 // Performance Counters support | |
| 1279 virtual void update_counters(); | |
| 1280 virtual void update_counters(size_t used); | |
| 1281 void initialize_performance_counters(); | |
| 1282 CollectorCounters* counters() { return collector()->counters(); } | |
| 1283 | |
| 1284 // Support for parallel remark of survivor space | |
| 1285 void* get_data_recorder(int thr_num) { | |
| 1286 //Delegate to collector | |
| 1287 return collector()->get_data_recorder(thr_num); | |
| 1288 } | |
| 1289 | |
| 1290 // Printing | |
| 1291 const char* name() const; | |
| 1292 virtual const char* short_name() const { return "CMS"; } | |
| 1293 void print() const; | |
| 1294 void printOccupancy(const char* s); | |
| 1295 bool must_be_youngest() const { return false; } | |
| 1296 bool must_be_oldest() const { return true; } | |
| 1297 | |
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1298 // Resize the generation after a compacting GC. The |
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1299 // generation can be treated as a contiguous space |
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1300 // after the compaction. |
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1301 virtual void compute_new_size(); |
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1302 // Resize the generation after a non-compacting |
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1303 // collection. |
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1304 void compute_new_size_free_list(); |
| 0 | 1305 |
| 1306 CollectionTypes debug_collection_type() { return _debug_collection_type; } | |
| 1307 void rotate_debug_collection_type(); | |
| 1308 }; | |
| 1309 | |
| 1310 class ASConcurrentMarkSweepGeneration : public ConcurrentMarkSweepGeneration { | |
| 1311 | |
| 1312 // Return the size policy from the heap's collector | |
| 1313 // policy casted to CMSAdaptiveSizePolicy*. | |
| 1314 CMSAdaptiveSizePolicy* cms_size_policy() const; | |
| 1315 | |
| 1316 // Resize the generation based on the adaptive size | |
| 1317 // policy. | |
| 1318 void resize(size_t cur_promo, size_t desired_promo); | |
| 1319 | |
| 1320 // Return the GC counters from the collector policy | |
| 1321 CMSGCAdaptivePolicyCounters* gc_adaptive_policy_counters(); | |
| 1322 | |
| 1323 virtual void shrink_by(size_t bytes); | |
| 1324 | |
| 1325 public: | |
| 1326 ASConcurrentMarkSweepGeneration(ReservedSpace rs, size_t initial_byte_size, | |
| 1327 int level, CardTableRS* ct, | |
| 1328 bool use_adaptive_freelists, | |
| 6026 | 1329 FreeBlockDictionary<FreeChunk>::DictionaryChoice |
| 0 | 1330 dictionaryChoice) : |
| 1331 ConcurrentMarkSweepGeneration(rs, initial_byte_size, level, ct, | |
| 1332 use_adaptive_freelists, dictionaryChoice) {} | |
| 1333 | |
| 1334 virtual const char* short_name() const { return "ASCMS"; } | |
| 1335 virtual Generation::Name kind() { return Generation::ASConcurrentMarkSweep; } | |
| 1336 | |
| 1337 virtual void update_counters(); | |
| 1338 virtual void update_counters(size_t used); | |
| 1339 }; | |
| 1340 | |
| 1341 // | |
| 1342 // Closures of various sorts used by CMS to accomplish its work | |
| 1343 // | |
| 1344 | |
| 1345 // This closure is used to check that a certain set of oops is empty. | |
| 1346 class FalseClosure: public OopClosure { | |
| 1347 public: | |
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1348 void do_oop(oop* p) { guarantee(false, "Should be an empty set"); } |
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1349 void do_oop(narrowOop* p) { guarantee(false, "Should be an empty set"); } |
| 0 | 1350 }; |
| 1351 | |
| 1352 // This closure is used to do concurrent marking from the roots | |
| 1353 // following the first checkpoint. | |
| 1354 class MarkFromRootsClosure: public BitMapClosure { | |
| 1355 CMSCollector* _collector; | |
| 1356 MemRegion _span; | |
| 1357 CMSBitMap* _bitMap; | |
| 1358 CMSBitMap* _mut; | |
| 1359 CMSMarkStack* _markStack; | |
| 1360 bool _yield; | |
| 1361 int _skipBits; | |
| 1362 HeapWord* _finger; | |
| 1363 HeapWord* _threshold; | |
| 1364 DEBUG_ONLY(bool _verifying;) | |
| 1365 | |
| 1366 public: | |
| 1367 MarkFromRootsClosure(CMSCollector* collector, MemRegion span, | |
| 1368 CMSBitMap* bitMap, | |
| 1369 CMSMarkStack* markStack, | |
| 1370 bool should_yield, bool verifying = false); | |
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1371 bool do_bit(size_t offset); |
| 0 | 1372 void reset(HeapWord* addr); |
| 1373 inline void do_yield_check(); | |
| 1374 | |
| 1375 private: | |
| 1376 void scanOopsInOop(HeapWord* ptr); | |
| 1377 void do_yield_work(); | |
| 1378 }; | |
| 1379 | |
| 1380 // This closure is used to do concurrent multi-threaded | |
| 1381 // marking from the roots following the first checkpoint. | |
| 1382 // XXX This should really be a subclass of The serial version | |
| 1383 // above, but i have not had the time to refactor things cleanly. | |
| 1384 // That willbe done for Dolphin. | |
| 1385 class Par_MarkFromRootsClosure: public BitMapClosure { | |
| 1386 CMSCollector* _collector; | |
| 1387 MemRegion _whole_span; | |
| 1388 MemRegion _span; | |
| 1389 CMSBitMap* _bit_map; | |
| 1390 CMSBitMap* _mut; | |
| 1391 OopTaskQueue* _work_queue; | |
| 1392 CMSMarkStack* _overflow_stack; | |
| 1393 bool _yield; | |
| 1394 int _skip_bits; | |
| 1395 HeapWord* _finger; | |
| 1396 HeapWord* _threshold; | |
| 1397 CMSConcMarkingTask* _task; | |
| 1398 public: | |
| 1399 Par_MarkFromRootsClosure(CMSConcMarkingTask* task, CMSCollector* collector, | |
| 1400 MemRegion span, | |
| 1401 CMSBitMap* bit_map, | |
| 1402 OopTaskQueue* work_queue, | |
| 1403 CMSMarkStack* overflow_stack, | |
| 1404 bool should_yield); | |
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1405 bool do_bit(size_t offset); |
| 0 | 1406 inline void do_yield_check(); |
| 1407 | |
| 1408 private: | |
| 1409 void scan_oops_in_oop(HeapWord* ptr); | |
| 1410 void do_yield_work(); | |
| 1411 bool get_work_from_overflow_stack(); | |
| 1412 }; | |
| 1413 | |
| 1414 // The following closures are used to do certain kinds of verification of | |
| 1415 // CMS marking. | |
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1416 class PushAndMarkVerifyClosure: public CMSOopClosure { |
| 0 | 1417 CMSCollector* _collector; |
| 1418 MemRegion _span; | |
| 1419 CMSBitMap* _verification_bm; | |
| 1420 CMSBitMap* _cms_bm; | |
| 1421 CMSMarkStack* _mark_stack; | |
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1422 protected: |
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1423 void do_oop(oop p); |
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1424 template <class T> inline void do_oop_work(T *p) { |
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1425 oop obj = oopDesc::load_decode_heap_oop(p); |
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1426 do_oop(obj); |
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1427 } |
| 0 | 1428 public: |
| 1429 PushAndMarkVerifyClosure(CMSCollector* cms_collector, | |
| 1430 MemRegion span, | |
| 1431 CMSBitMap* verification_bm, | |
| 1432 CMSBitMap* cms_bm, | |
| 1433 CMSMarkStack* mark_stack); | |
| 1434 void do_oop(oop* p); | |
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1435 void do_oop(narrowOop* p); |
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1436 |
| 0 | 1437 // Deal with a stack overflow condition |
| 1438 void handle_stack_overflow(HeapWord* lost); | |
| 1439 }; | |
| 1440 | |
| 1441 class MarkFromRootsVerifyClosure: public BitMapClosure { | |
| 1442 CMSCollector* _collector; | |
| 1443 MemRegion _span; | |
| 1444 CMSBitMap* _verification_bm; | |
| 1445 CMSBitMap* _cms_bm; | |
| 1446 CMSMarkStack* _mark_stack; | |
| 1447 HeapWord* _finger; | |
| 1448 PushAndMarkVerifyClosure _pam_verify_closure; | |
| 1449 public: | |
| 1450 MarkFromRootsVerifyClosure(CMSCollector* collector, MemRegion span, | |
| 1451 CMSBitMap* verification_bm, | |
| 1452 CMSBitMap* cms_bm, | |
| 1453 CMSMarkStack* mark_stack); | |
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1454 bool do_bit(size_t offset); |
| 0 | 1455 void reset(HeapWord* addr); |
| 1456 }; | |
| 1457 | |
| 1458 | |
| 1459 // This closure is used to check that a certain set of bits is | |
| 1460 // "empty" (i.e. the bit vector doesn't have any 1-bits). | |
| 1461 class FalseBitMapClosure: public BitMapClosure { | |
| 1462 public: | |
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1463 bool do_bit(size_t offset) { |
| 0 | 1464 guarantee(false, "Should not have a 1 bit"); |
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1465 return true; |
| 0 | 1466 } |
| 1467 }; | |
| 1468 | |
| 1469 // This closure is used during the second checkpointing phase | |
| 1470 // to rescan the marked objects on the dirty cards in the mod | |
| 1471 // union table and the card table proper. It's invoked via | |
| 1472 // MarkFromDirtyCardsClosure below. It uses either | |
| 1473 // [Par_]MarkRefsIntoAndScanClosure (Par_ in the parallel case) | |
| 1474 // declared in genOopClosures.hpp to accomplish some of its work. | |
| 1475 // In the parallel case the bitMap is shared, so access to | |
| 1476 // it needs to be suitably synchronized for updates by embedded | |
| 1477 // closures that update it; however, this closure itself only | |
| 1478 // reads the bit_map and because it is idempotent, is immune to | |
| 1479 // reading stale values. | |
| 1480 class ScanMarkedObjectsAgainClosure: public UpwardsObjectClosure { | |
| 1481 #ifdef ASSERT | |
| 1482 CMSCollector* _collector; | |
| 1483 MemRegion _span; | |
| 1484 union { | |
| 1485 CMSMarkStack* _mark_stack; | |
| 1486 OopTaskQueue* _work_queue; | |
| 1487 }; | |
| 1488 #endif // ASSERT | |
| 1489 bool _parallel; | |
| 1490 CMSBitMap* _bit_map; | |
| 1491 union { | |
| 1492 MarkRefsIntoAndScanClosure* _scan_closure; | |
| 1493 Par_MarkRefsIntoAndScanClosure* _par_scan_closure; | |
| 1494 }; | |
| 1495 | |
| 1496 public: | |
| 1497 ScanMarkedObjectsAgainClosure(CMSCollector* collector, | |
| 1498 MemRegion span, | |
| 1499 ReferenceProcessor* rp, | |
| 1500 CMSBitMap* bit_map, | |
| 1501 CMSMarkStack* mark_stack, | |
| 1502 MarkRefsIntoAndScanClosure* cl): | |
| 1503 #ifdef ASSERT | |
| 1504 _collector(collector), | |
| 1505 _span(span), | |
| 1506 _mark_stack(mark_stack), | |
| 1507 #endif // ASSERT | |
| 1508 _parallel(false), | |
| 1509 _bit_map(bit_map), | |
| 1510 _scan_closure(cl) { } | |
| 1511 | |
| 1512 ScanMarkedObjectsAgainClosure(CMSCollector* collector, | |
| 1513 MemRegion span, | |
| 1514 ReferenceProcessor* rp, | |
| 1515 CMSBitMap* bit_map, | |
| 1516 OopTaskQueue* work_queue, | |
| 1517 Par_MarkRefsIntoAndScanClosure* cl): | |
| 1518 #ifdef ASSERT | |
| 1519 _collector(collector), | |
| 1520 _span(span), | |
| 1521 _work_queue(work_queue), | |
| 1522 #endif // ASSERT | |
| 1523 _parallel(true), | |
| 1524 _bit_map(bit_map), | |
| 1525 _par_scan_closure(cl) { } | |
| 1526 | |
| 1527 void do_object(oop obj) { | |
| 1528 guarantee(false, "Call do_object_b(oop, MemRegion) instead"); | |
| 1529 } | |
| 1530 bool do_object_b(oop obj) { | |
| 1531 guarantee(false, "Call do_object_b(oop, MemRegion) form instead"); | |
| 1532 return false; | |
| 1533 } | |
| 1534 bool do_object_bm(oop p, MemRegion mr); | |
| 1535 }; | |
| 1536 | |
| 1537 // This closure is used during the second checkpointing phase | |
| 1538 // to rescan the marked objects on the dirty cards in the mod | |
| 1539 // union table and the card table proper. It invokes | |
| 1540 // ScanMarkedObjectsAgainClosure above to accomplish much of its work. | |
| 1541 // In the parallel case, the bit map is shared and requires | |
| 1542 // synchronized access. | |
| 1543 class MarkFromDirtyCardsClosure: public MemRegionClosure { | |
| 1544 CompactibleFreeListSpace* _space; | |
| 1545 ScanMarkedObjectsAgainClosure _scan_cl; | |
| 1546 size_t _num_dirty_cards; | |
| 1547 | |
| 1548 public: | |
| 1549 MarkFromDirtyCardsClosure(CMSCollector* collector, | |
| 1550 MemRegion span, | |
| 1551 CompactibleFreeListSpace* space, | |
| 1552 CMSBitMap* bit_map, | |
| 1553 CMSMarkStack* mark_stack, | |
| 1554 MarkRefsIntoAndScanClosure* cl): | |
| 1555 _space(space), | |
| 1556 _num_dirty_cards(0), | |
| 1557 _scan_cl(collector, span, collector->ref_processor(), bit_map, | |
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1558 mark_stack, cl) { } |
| 0 | 1559 |
| 1560 MarkFromDirtyCardsClosure(CMSCollector* collector, | |
| 1561 MemRegion span, | |
| 1562 CompactibleFreeListSpace* space, | |
| 1563 CMSBitMap* bit_map, | |
| 1564 OopTaskQueue* work_queue, | |
| 1565 Par_MarkRefsIntoAndScanClosure* cl): | |
| 1566 _space(space), | |
| 1567 _num_dirty_cards(0), | |
| 1568 _scan_cl(collector, span, collector->ref_processor(), bit_map, | |
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1569 work_queue, cl) { } |
| 0 | 1570 |
| 1571 void do_MemRegion(MemRegion mr); | |
| 1572 void set_space(CompactibleFreeListSpace* space) { _space = space; } | |
| 1573 size_t num_dirty_cards() { return _num_dirty_cards; } | |
| 1574 }; | |
| 1575 | |
| 1576 // This closure is used in the non-product build to check | |
| 1577 // that there are no MemRegions with a certain property. | |
| 1578 class FalseMemRegionClosure: public MemRegionClosure { | |
| 1579 void do_MemRegion(MemRegion mr) { | |
| 1580 guarantee(!mr.is_empty(), "Shouldn't be empty"); | |
| 1581 guarantee(false, "Should never be here"); | |
| 1582 } | |
| 1583 }; | |
| 1584 | |
| 1585 // This closure is used during the precleaning phase | |
| 1586 // to "carefully" rescan marked objects on dirty cards. | |
| 1587 // It uses MarkRefsIntoAndScanClosure declared in genOopClosures.hpp | |
| 1588 // to accomplish some of its work. | |
| 1589 class ScanMarkedObjectsAgainCarefullyClosure: public ObjectClosureCareful { | |
| 1590 CMSCollector* _collector; | |
| 1591 MemRegion _span; | |
| 1592 bool _yield; | |
| 1593 Mutex* _freelistLock; | |
| 1594 CMSBitMap* _bitMap; | |
| 1595 CMSMarkStack* _markStack; | |
| 1596 MarkRefsIntoAndScanClosure* _scanningClosure; | |
| 1597 | |
| 1598 public: | |
| 1599 ScanMarkedObjectsAgainCarefullyClosure(CMSCollector* collector, | |
| 1600 MemRegion span, | |
| 1601 CMSBitMap* bitMap, | |
| 1602 CMSMarkStack* markStack, | |
| 1603 MarkRefsIntoAndScanClosure* cl, | |
| 1604 bool should_yield): | |
| 1605 _collector(collector), | |
| 1606 _span(span), | |
| 1607 _yield(should_yield), | |
| 1608 _bitMap(bitMap), | |
| 1609 _markStack(markStack), | |
| 1610 _scanningClosure(cl) { | |
| 1611 } | |
| 1612 | |
| 1613 void do_object(oop p) { | |
| 1614 guarantee(false, "call do_object_careful instead"); | |
| 1615 } | |
| 1616 | |
| 1617 size_t do_object_careful(oop p) { | |
| 1618 guarantee(false, "Unexpected caller"); | |
| 1619 return 0; | |
| 1620 } | |
| 1621 | |
| 1622 size_t do_object_careful_m(oop p, MemRegion mr); | |
| 1623 | |
| 1624 void setFreelistLock(Mutex* m) { | |
| 1625 _freelistLock = m; | |
| 1626 _scanningClosure->set_freelistLock(m); | |
| 1627 } | |
| 1628 | |
| 1629 private: | |
| 1630 inline bool do_yield_check(); | |
| 1631 | |
| 1632 void do_yield_work(); | |
| 1633 }; | |
| 1634 | |
| 1635 class SurvivorSpacePrecleanClosure: public ObjectClosureCareful { | |
| 1636 CMSCollector* _collector; | |
| 1637 MemRegion _span; | |
| 1638 bool _yield; | |
| 1639 CMSBitMap* _bit_map; | |
| 1640 CMSMarkStack* _mark_stack; | |
| 1641 PushAndMarkClosure* _scanning_closure; | |
| 1642 unsigned int _before_count; | |
| 1643 | |
| 1644 public: | |
| 1645 SurvivorSpacePrecleanClosure(CMSCollector* collector, | |
| 1646 MemRegion span, | |
| 1647 CMSBitMap* bit_map, | |
| 1648 CMSMarkStack* mark_stack, | |
| 1649 PushAndMarkClosure* cl, | |
| 1650 unsigned int before_count, | |
| 1651 bool should_yield): | |
| 1652 _collector(collector), | |
| 1653 _span(span), | |
| 1654 _yield(should_yield), | |
| 1655 _bit_map(bit_map), | |
| 1656 _mark_stack(mark_stack), | |
| 1657 _scanning_closure(cl), | |
| 1658 _before_count(before_count) | |
| 1659 { } | |
| 1660 | |
| 1661 void do_object(oop p) { | |
| 1662 guarantee(false, "call do_object_careful instead"); | |
| 1663 } | |
| 1664 | |
| 1665 size_t do_object_careful(oop p); | |
| 1666 | |
| 1667 size_t do_object_careful_m(oop p, MemRegion mr) { | |
| 1668 guarantee(false, "Unexpected caller"); | |
| 1669 return 0; | |
| 1670 } | |
| 1671 | |
| 1672 private: | |
| 1673 inline void do_yield_check(); | |
| 1674 void do_yield_work(); | |
| 1675 }; | |
| 1676 | |
| 1677 // This closure is used to accomplish the sweeping work | |
| 1678 // after the second checkpoint but before the concurrent reset | |
| 1679 // phase. | |
| 1680 // | |
| 1681 // Terminology | |
| 1682 // left hand chunk (LHC) - block of one or more chunks currently being | |
| 1683 // coalesced. The LHC is available for coalescing with a new chunk. | |
| 1684 // right hand chunk (RHC) - block that is currently being swept that is | |
| 1685 // free or garbage that can be coalesced with the LHC. | |
| 1686 // _inFreeRange is true if there is currently a LHC | |
| 1687 // _lastFreeRangeCoalesced is true if the LHC consists of more than one chunk. | |
| 1688 // _freeRangeInFreeLists is true if the LHC is in the free lists. | |
| 1689 // _freeFinger is the address of the current LHC | |
| 1690 class SweepClosure: public BlkClosureCareful { | |
| 1691 CMSCollector* _collector; // collector doing the work | |
| 1692 ConcurrentMarkSweepGeneration* _g; // Generation being swept | |
| 1693 CompactibleFreeListSpace* _sp; // Space being swept | |
|
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1694 HeapWord* _limit;// the address at or above which the sweep should stop |
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1695 // because we do not expect newly garbage blocks |
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1696 // eligible for sweeping past that address. |
| 0 | 1697 Mutex* _freelistLock; // Free list lock (in space) |
| 1698 CMSBitMap* _bitMap; // Marking bit map (in | |
| 1699 // generation) | |
| 1700 bool _inFreeRange; // Indicates if we are in the | |
| 1701 // midst of a free run | |
| 1702 bool _freeRangeInFreeLists; | |
| 1703 // Often, we have just found | |
| 1704 // a free chunk and started | |
| 1705 // a new free range; we do not | |
| 1706 // eagerly remove this chunk from | |
| 1707 // the free lists unless there is | |
| 1708 // a possibility of coalescing. | |
| 1709 // When true, this flag indicates | |
| 1710 // that the _freeFinger below | |
| 1711 // points to a potentially free chunk | |
| 1712 // that may still be in the free lists | |
| 1713 bool _lastFreeRangeCoalesced; | |
| 1714 // free range contains chunks | |
| 1715 // coalesced | |
| 1716 bool _yield; | |
| 1717 // Whether sweeping should be | |
| 1718 // done with yields. For instance | |
| 1719 // when done by the foreground | |
| 1720 // collector we shouldn't yield. | |
| 1721 HeapWord* _freeFinger; // When _inFreeRange is set, the | |
| 1722 // pointer to the "left hand | |
| 1723 // chunk" | |
| 1724 size_t _freeRangeSize; | |
| 1725 // When _inFreeRange is set, this | |
| 1726 // indicates the accumulated size | |
| 1727 // of the "left hand chunk" | |
| 1728 NOT_PRODUCT( | |
| 1729 size_t _numObjectsFreed; | |
| 1730 size_t _numWordsFreed; | |
| 1731 size_t _numObjectsLive; | |
| 1732 size_t _numWordsLive; | |
| 1733 size_t _numObjectsAlreadyFree; | |
| 1734 size_t _numWordsAlreadyFree; | |
| 1735 FreeChunk* _last_fc; | |
| 1736 ) | |
| 1737 private: | |
| 1738 // Code that is common to a free chunk or garbage when | |
| 1739 // encountered during sweeping. | |
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1740 void do_post_free_or_garbage_chunk(FreeChunk *fc, size_t chunkSize); |
| 0 | 1741 // Process a free chunk during sweeping. |
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1742 void do_already_free_chunk(FreeChunk *fc); |
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1743 // Work method called when processing an already free or a |
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1744 // freshly garbage chunk to do a lookahead and possibly a |
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1745 // premptive flush if crossing over _limit. |
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1746 void lookahead_and_flush(FreeChunk* fc, size_t chunkSize); |
| 0 | 1747 // Process a garbage chunk during sweeping. |
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1748 size_t do_garbage_chunk(FreeChunk *fc); |
| 0 | 1749 // Process a live chunk during sweeping. |
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1750 size_t do_live_chunk(FreeChunk* fc); |
| 0 | 1751 |
| 1752 // Accessors. | |
| 1753 HeapWord* freeFinger() const { return _freeFinger; } | |
| 1754 void set_freeFinger(HeapWord* v) { _freeFinger = v; } | |
| 1755 bool inFreeRange() const { return _inFreeRange; } | |
| 1756 void set_inFreeRange(bool v) { _inFreeRange = v; } | |
| 1757 bool lastFreeRangeCoalesced() const { return _lastFreeRangeCoalesced; } | |
| 1758 void set_lastFreeRangeCoalesced(bool v) { _lastFreeRangeCoalesced = v; } | |
| 1759 bool freeRangeInFreeLists() const { return _freeRangeInFreeLists; } | |
| 1760 void set_freeRangeInFreeLists(bool v) { _freeRangeInFreeLists = v; } | |
| 1761 | |
| 1762 // Initialize a free range. | |
| 1763 void initialize_free_range(HeapWord* freeFinger, bool freeRangeInFreeLists); | |
| 1764 // Return this chunk to the free lists. | |
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1765 void flush_cur_free_chunk(HeapWord* chunk, size_t size); |
| 0 | 1766 |
| 1767 // Check if we should yield and do so when necessary. | |
| 1768 inline void do_yield_check(HeapWord* addr); | |
| 1769 | |
| 1770 // Yield | |
| 1771 void do_yield_work(HeapWord* addr); | |
| 1772 | |
| 1773 // Debugging/Printing | |
|
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1774 void print_free_block_coalesced(FreeChunk* fc) const; |
| 0 | 1775 |
| 1776 public: | |
| 1777 SweepClosure(CMSCollector* collector, ConcurrentMarkSweepGeneration* g, | |
| 1778 CMSBitMap* bitMap, bool should_yield); | |
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1779 ~SweepClosure() PRODUCT_RETURN; |
| 0 | 1780 |
| 1781 size_t do_blk_careful(HeapWord* addr); | |
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1782 void print() const { print_on(tty); } |
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1783 void print_on(outputStream *st) const; |
| 0 | 1784 }; |
| 1785 | |
| 1786 // Closures related to weak references processing | |
| 1787 | |
| 1788 // During CMS' weak reference processing, this is a | |
| 1789 // work-routine/closure used to complete transitive | |
| 1790 // marking of objects as live after a certain point | |
| 1791 // in which an initial set has been completely accumulated. | |
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1792 // This closure is currently used both during the final |
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1793 // remark stop-world phase, as well as during the concurrent |
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1794 // precleaning of the discovered reference lists. |
| 0 | 1795 class CMSDrainMarkingStackClosure: public VoidClosure { |
| 1796 CMSCollector* _collector; | |
| 1797 MemRegion _span; | |
| 1798 CMSMarkStack* _mark_stack; | |
| 1799 CMSBitMap* _bit_map; | |
| 1800 CMSKeepAliveClosure* _keep_alive; | |
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1801 bool _concurrent_precleaning; |
| 0 | 1802 public: |
| 1803 CMSDrainMarkingStackClosure(CMSCollector* collector, MemRegion span, | |
| 1804 CMSBitMap* bit_map, CMSMarkStack* mark_stack, | |
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1805 CMSKeepAliveClosure* keep_alive, |
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1806 bool cpc): |
| 0 | 1807 _collector(collector), |
| 1808 _span(span), | |
| 1809 _bit_map(bit_map), | |
| 1810 _mark_stack(mark_stack), | |
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1811 _keep_alive(keep_alive), |
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1812 _concurrent_precleaning(cpc) { |
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1813 assert(_concurrent_precleaning == _keep_alive->concurrent_precleaning(), |
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1814 "Mismatch"); |
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1815 } |
| 0 | 1816 |
| 1817 void do_void(); | |
| 1818 }; | |
| 1819 | |
| 1820 // A parallel version of CMSDrainMarkingStackClosure above. | |
| 1821 class CMSParDrainMarkingStackClosure: public VoidClosure { | |
| 1822 CMSCollector* _collector; | |
| 1823 MemRegion _span; | |
| 1824 OopTaskQueue* _work_queue; | |
| 1825 CMSBitMap* _bit_map; | |
| 1826 CMSInnerParMarkAndPushClosure _mark_and_push; | |
| 1827 | |
| 1828 public: | |
| 1829 CMSParDrainMarkingStackClosure(CMSCollector* collector, | |
| 1830 MemRegion span, CMSBitMap* bit_map, | |
| 1831 OopTaskQueue* work_queue): | |
| 1832 _collector(collector), | |
| 1833 _span(span), | |
| 1834 _bit_map(bit_map), | |
| 1835 _work_queue(work_queue), | |
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1836 _mark_and_push(collector, span, bit_map, work_queue) { } |
| 0 | 1837 |
| 1838 public: | |
| 1839 void trim_queue(uint max); | |
| 1840 void do_void(); | |
| 1841 }; | |
| 1842 | |
| 1843 // Allow yielding or short-circuiting of reference list | |
| 1844 // prelceaning work. | |
| 1845 class CMSPrecleanRefsYieldClosure: public YieldClosure { | |
| 1846 CMSCollector* _collector; | |
| 1847 void do_yield_work(); | |
| 1848 public: | |
| 1849 CMSPrecleanRefsYieldClosure(CMSCollector* collector): | |
| 1850 _collector(collector) {} | |
| 1851 virtual bool should_return(); | |
| 1852 }; | |
| 1853 | |
| 1854 | |
| 1855 // Convenience class that locks free list locks for given CMS collector | |
| 1856 class FreelistLocker: public StackObj { | |
| 1857 private: | |
| 1858 CMSCollector* _collector; | |
| 1859 public: | |
| 1860 FreelistLocker(CMSCollector* collector): | |
| 1861 _collector(collector) { | |
| 1862 _collector->getFreelistLocks(); | |
| 1863 } | |
| 1864 | |
| 1865 ~FreelistLocker() { | |
| 1866 _collector->releaseFreelistLocks(); | |
| 1867 } | |
| 1868 }; | |
| 1869 | |
| 1870 // Mark all dead objects in a given space. | |
| 1871 class MarkDeadObjectsClosure: public BlkClosure { | |
| 1872 const CMSCollector* _collector; | |
| 1873 const CompactibleFreeListSpace* _sp; | |
| 1874 CMSBitMap* _live_bit_map; | |
| 1875 CMSBitMap* _dead_bit_map; | |
| 1876 public: | |
| 1877 MarkDeadObjectsClosure(const CMSCollector* collector, | |
| 1878 const CompactibleFreeListSpace* sp, | |
| 1879 CMSBitMap *live_bit_map, | |
| 1880 CMSBitMap *dead_bit_map) : | |
| 1881 _collector(collector), | |
| 1882 _sp(sp), | |
| 1883 _live_bit_map(live_bit_map), | |
| 1884 _dead_bit_map(dead_bit_map) {} | |
| 1885 size_t do_blk(HeapWord* addr); | |
| 1886 }; | |
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1887 |
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1888 class TraceCMSMemoryManagerStats : public TraceMemoryManagerStats { |
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1889 |
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1890 public: |
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1891 TraceCMSMemoryManagerStats(CMSCollector::CollectorState phase, GCCause::Cause cause); |
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1892 }; |
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1893 |
| 1972 | 1894 |
| 1895 #endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CONCURRENTMARKSWEEPGENERATION_HPP |