Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.hpp @ 3772:6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
Summary: Perform a heap verification after the first phase of G1's full GC using objects' mark words to determine liveness. The third parameter of the heap verification routines, which was used in G1 to determine which marking bitmap to use in liveness calculations, has been changed from a boolean to an enum with values defined for using the mark word, and the 'prev' and 'next' bitmaps.
Reviewed-by: tonyp, ysr
| author | johnc |
|---|---|
| date | Tue, 14 Jun 2011 11:01:10 -0700 |
| parents | 842b840e67db |
| children | 23d434c6290d |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 2152 | 2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
| 342 | 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. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP | |
| 27 | |
| 2152 | 28 #include "gc_implementation/g1/heapRegionSets.hpp" |
| 1972 | 29 #include "utilities/taskqueue.hpp" |
| 30 | |
| 342 | 31 class G1CollectedHeap; |
| 32 class CMTask; | |
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33 typedef GenericTaskQueue<oop> CMTaskQueue; |
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34 typedef GenericTaskQueueSet<CMTaskQueue> CMTaskQueueSet; |
| 342 | 35 |
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36 // Closure used by CM during concurrent reference discovery |
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37 // and reference processing (during remarking) to determine |
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38 // if a particular object is alive. It is primarily used |
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39 // to determine if referents of discovered reference objects |
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40 // are alive. An instance is also embedded into the |
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41 // reference processor as the _is_alive_non_header field |
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42 class G1CMIsAliveClosure: public BoolObjectClosure { |
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43 G1CollectedHeap* _g1; |
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44 public: |
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45 G1CMIsAliveClosure(G1CollectedHeap* g1) : |
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46 _g1(g1) |
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47 {} |
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48 |
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49 void do_object(oop obj) { |
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50 ShouldNotCallThis(); |
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51 } |
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52 bool do_object_b(oop obj); |
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53 }; |
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54 |
| 342 | 55 // A generic CM bit map. This is essentially a wrapper around the BitMap |
| 56 // class, with one bit per (1<<_shifter) HeapWords. | |
| 57 | |
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58 class CMBitMapRO VALUE_OBJ_CLASS_SPEC { |
| 342 | 59 protected: |
| 60 HeapWord* _bmStartWord; // base address of range covered by map | |
| 61 size_t _bmWordSize; // map size (in #HeapWords covered) | |
| 62 const int _shifter; // map to char or bit | |
| 63 VirtualSpace _virtual_space; // underlying the bit map | |
| 64 BitMap _bm; // the bit map itself | |
| 65 | |
| 66 public: | |
| 67 // constructor | |
| 68 CMBitMapRO(ReservedSpace rs, int shifter); | |
| 69 | |
| 70 enum { do_yield = true }; | |
| 71 | |
| 72 // inquiries | |
| 73 HeapWord* startWord() const { return _bmStartWord; } | |
| 74 size_t sizeInWords() const { return _bmWordSize; } | |
| 75 // the following is one past the last word in space | |
| 76 HeapWord* endWord() const { return _bmStartWord + _bmWordSize; } | |
| 77 | |
| 78 // read marks | |
| 79 | |
| 80 bool isMarked(HeapWord* addr) const { | |
| 81 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
| 82 "outside underlying space?"); | |
| 83 return _bm.at(heapWordToOffset(addr)); | |
| 84 } | |
| 85 | |
| 86 // iteration | |
| 87 bool iterate(BitMapClosure* cl) { return _bm.iterate(cl); } | |
| 88 bool iterate(BitMapClosure* cl, MemRegion mr); | |
| 89 | |
| 90 // Return the address corresponding to the next marked bit at or after | |
| 91 // "addr", and before "limit", if "limit" is non-NULL. If there is no | |
| 92 // such bit, returns "limit" if that is non-NULL, or else "endWord()". | |
| 93 HeapWord* getNextMarkedWordAddress(HeapWord* addr, | |
| 94 HeapWord* limit = NULL) const; | |
| 95 // Return the address corresponding to the next unmarked bit at or after | |
| 96 // "addr", and before "limit", if "limit" is non-NULL. If there is no | |
| 97 // such bit, returns "limit" if that is non-NULL, or else "endWord()". | |
| 98 HeapWord* getNextUnmarkedWordAddress(HeapWord* addr, | |
| 99 HeapWord* limit = NULL) const; | |
| 100 | |
| 101 // conversion utilities | |
| 102 // XXX Fix these so that offsets are size_t's... | |
| 103 HeapWord* offsetToHeapWord(size_t offset) const { | |
| 104 return _bmStartWord + (offset << _shifter); | |
| 105 } | |
| 106 size_t heapWordToOffset(HeapWord* addr) const { | |
| 107 return pointer_delta(addr, _bmStartWord) >> _shifter; | |
| 108 } | |
| 109 int heapWordDiffToOffsetDiff(size_t diff) const; | |
| 110 HeapWord* nextWord(HeapWord* addr) { | |
| 111 return offsetToHeapWord(heapWordToOffset(addr) + 1); | |
| 112 } | |
| 113 | |
| 114 void mostly_disjoint_range_union(BitMap* from_bitmap, | |
| 115 size_t from_start_index, | |
| 116 HeapWord* to_start_word, | |
| 117 size_t word_num); | |
| 118 | |
| 119 // debugging | |
| 120 NOT_PRODUCT(bool covers(ReservedSpace rs) const;) | |
| 121 }; | |
| 122 | |
| 123 class CMBitMap : public CMBitMapRO { | |
| 124 | |
| 125 public: | |
| 126 // constructor | |
| 127 CMBitMap(ReservedSpace rs, int shifter) : | |
| 128 CMBitMapRO(rs, shifter) {} | |
| 129 | |
| 130 // write marks | |
| 131 void mark(HeapWord* addr) { | |
| 132 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
| 133 "outside underlying space?"); | |
| 3771 | 134 _bm.set_bit(heapWordToOffset(addr)); |
| 342 | 135 } |
| 136 void clear(HeapWord* addr) { | |
| 137 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
| 138 "outside underlying space?"); | |
| 3771 | 139 _bm.clear_bit(heapWordToOffset(addr)); |
| 342 | 140 } |
| 141 bool parMark(HeapWord* addr) { | |
| 142 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
| 143 "outside underlying space?"); | |
| 3771 | 144 return _bm.par_set_bit(heapWordToOffset(addr)); |
| 342 | 145 } |
| 146 bool parClear(HeapWord* addr) { | |
| 147 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
| 148 "outside underlying space?"); | |
| 3771 | 149 return _bm.par_clear_bit(heapWordToOffset(addr)); |
| 342 | 150 } |
| 151 void markRange(MemRegion mr); | |
| 152 void clearAll(); | |
| 153 void clearRange(MemRegion mr); | |
| 154 | |
| 155 // Starting at the bit corresponding to "addr" (inclusive), find the next | |
| 156 // "1" bit, if any. This bit starts some run of consecutive "1"'s; find | |
| 157 // the end of this run (stopping at "end_addr"). Return the MemRegion | |
| 158 // covering from the start of the region corresponding to the first bit | |
| 159 // of the run to the end of the region corresponding to the last bit of | |
| 160 // the run. If there is no "1" bit at or after "addr", return an empty | |
| 161 // MemRegion. | |
| 162 MemRegion getAndClearMarkedRegion(HeapWord* addr, HeapWord* end_addr); | |
| 163 }; | |
| 164 | |
| 165 // Represents a marking stack used by the CM collector. | |
| 166 // Ideally this should be GrowableArray<> just like MSC's marking stack(s). | |
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167 class CMMarkStack VALUE_OBJ_CLASS_SPEC { |
| 342 | 168 ConcurrentMark* _cm; |
| 169 oop* _base; // bottom of stack | |
| 170 jint _index; // one more than last occupied index | |
| 171 jint _capacity; // max #elements | |
| 172 jint _oops_do_bound; // Number of elements to include in next iteration. | |
| 173 NOT_PRODUCT(jint _max_depth;) // max depth plumbed during run | |
| 174 | |
| 175 bool _overflow; | |
| 176 DEBUG_ONLY(bool _drain_in_progress;) | |
| 177 DEBUG_ONLY(bool _drain_in_progress_yields;) | |
| 178 | |
| 179 public: | |
| 180 CMMarkStack(ConcurrentMark* cm); | |
| 181 ~CMMarkStack(); | |
| 182 | |
| 183 void allocate(size_t size); | |
| 184 | |
| 185 oop pop() { | |
| 186 if (!isEmpty()) { | |
| 187 return _base[--_index] ; | |
| 188 } | |
| 189 return NULL; | |
| 190 } | |
| 191 | |
| 192 // If overflow happens, don't do the push, and record the overflow. | |
| 193 // *Requires* that "ptr" is already marked. | |
| 194 void push(oop ptr) { | |
| 195 if (isFull()) { | |
| 196 // Record overflow. | |
| 197 _overflow = true; | |
| 198 return; | |
| 199 } else { | |
| 200 _base[_index++] = ptr; | |
| 201 NOT_PRODUCT(_max_depth = MAX2(_max_depth, _index)); | |
| 202 } | |
| 203 } | |
| 204 // Non-block impl. Note: concurrency is allowed only with other | |
| 205 // "par_push" operations, not with "pop" or "drain". We would need | |
| 206 // parallel versions of them if such concurrency was desired. | |
| 207 void par_push(oop ptr); | |
| 208 | |
| 209 // Pushes the first "n" elements of "ptr_arr" on the stack. | |
| 210 // Non-block impl. Note: concurrency is allowed only with other | |
| 211 // "par_adjoin_arr" or "push" operations, not with "pop" or "drain". | |
| 212 void par_adjoin_arr(oop* ptr_arr, int n); | |
| 213 | |
| 214 // Pushes the first "n" elements of "ptr_arr" on the stack. | |
| 215 // Locking impl: concurrency is allowed only with | |
| 216 // "par_push_arr" and/or "par_pop_arr" operations, which use the same | |
| 217 // locking strategy. | |
| 218 void par_push_arr(oop* ptr_arr, int n); | |
| 219 | |
| 220 // If returns false, the array was empty. Otherwise, removes up to "max" | |
| 221 // elements from the stack, and transfers them to "ptr_arr" in an | |
| 222 // unspecified order. The actual number transferred is given in "n" ("n | |
| 223 // == 0" is deliberately redundant with the return value.) Locking impl: | |
| 224 // concurrency is allowed only with "par_push_arr" and/or "par_pop_arr" | |
| 225 // operations, which use the same locking strategy. | |
| 226 bool par_pop_arr(oop* ptr_arr, int max, int* n); | |
| 227 | |
| 228 // Drain the mark stack, applying the given closure to all fields of | |
| 229 // objects on the stack. (That is, continue until the stack is empty, | |
| 230 // even if closure applications add entries to the stack.) The "bm" | |
| 231 // argument, if non-null, may be used to verify that only marked objects | |
| 232 // are on the mark stack. If "yield_after" is "true", then the | |
| 233 // concurrent marker performing the drain offers to yield after | |
| 234 // processing each object. If a yield occurs, stops the drain operation | |
| 235 // and returns false. Otherwise, returns true. | |
| 236 template<class OopClosureClass> | |
| 237 bool drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after = false); | |
| 238 | |
| 239 bool isEmpty() { return _index == 0; } | |
| 240 bool isFull() { return _index == _capacity; } | |
| 241 int maxElems() { return _capacity; } | |
| 242 | |
| 243 bool overflow() { return _overflow; } | |
| 244 void clear_overflow() { _overflow = false; } | |
| 245 | |
| 246 int size() { return _index; } | |
| 247 | |
| 248 void setEmpty() { _index = 0; clear_overflow(); } | |
| 249 | |
| 250 // Record the current size; a subsequent "oops_do" will iterate only over | |
| 251 // indices valid at the time of this call. | |
| 252 void set_oops_do_bound(jint bound = -1) { | |
| 253 if (bound == -1) { | |
| 254 _oops_do_bound = _index; | |
| 255 } else { | |
| 256 _oops_do_bound = bound; | |
| 257 } | |
| 258 } | |
| 259 jint oops_do_bound() { return _oops_do_bound; } | |
| 260 // iterate over the oops in the mark stack, up to the bound recorded via | |
| 261 // the call above. | |
| 262 void oops_do(OopClosure* f); | |
| 263 }; | |
| 264 | |
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265 class CMRegionStack VALUE_OBJ_CLASS_SPEC { |
| 342 | 266 MemRegion* _base; |
| 267 jint _capacity; | |
| 268 jint _index; | |
| 269 jint _oops_do_bound; | |
| 270 bool _overflow; | |
| 271 public: | |
| 272 CMRegionStack(); | |
| 273 ~CMRegionStack(); | |
| 274 void allocate(size_t size); | |
| 275 | |
| 276 // This is lock-free; assumes that it will only be called in parallel | |
| 277 // with other "push" operations (no pops). | |
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278 void push_lock_free(MemRegion mr); |
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279 |
| 342 | 280 // Lock-free; assumes that it will only be called in parallel |
| 281 // with other "pop" operations (no pushes). | |
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282 MemRegion pop_lock_free(); |
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283 |
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284 #if 0 |
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285 // The routines that manipulate the region stack with a lock are |
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286 // not currently used. They should be retained, however, as a |
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287 // diagnostic aid. |
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288 |
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289 // These two are the implementations that use a lock. They can be |
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290 // called concurrently with each other but they should not be called |
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291 // concurrently with the lock-free versions (push() / pop()). |
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292 void push_with_lock(MemRegion mr); |
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293 MemRegion pop_with_lock(); |
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294 #endif |
| 342 | 295 |
| 296 bool isEmpty() { return _index == 0; } | |
| 297 bool isFull() { return _index == _capacity; } | |
| 298 | |
| 299 bool overflow() { return _overflow; } | |
| 300 void clear_overflow() { _overflow = false; } | |
| 301 | |
| 302 int size() { return _index; } | |
| 303 | |
| 304 // It iterates over the entries in the region stack and it | |
| 305 // invalidates (i.e. assigns MemRegion()) the ones that point to | |
| 306 // regions in the collection set. | |
| 307 bool invalidate_entries_into_cset(); | |
| 308 | |
| 309 // This gives an upper bound up to which the iteration in | |
| 310 // invalidate_entries_into_cset() will reach. This prevents | |
| 311 // newly-added entries to be unnecessarily scanned. | |
| 312 void set_oops_do_bound() { | |
| 313 _oops_do_bound = _index; | |
| 314 } | |
| 315 | |
| 316 void setEmpty() { _index = 0; clear_overflow(); } | |
| 317 }; | |
| 318 | |
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319 class ForceOverflowSettings VALUE_OBJ_CLASS_SPEC { |
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320 private: |
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321 #ifndef PRODUCT |
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322 uintx _num_remaining; |
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323 bool _force; |
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324 #endif // !defined(PRODUCT) |
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325 |
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326 public: |
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327 void init() PRODUCT_RETURN; |
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328 void update() PRODUCT_RETURN; |
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329 bool should_force() PRODUCT_RETURN_( return false; ); |
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330 }; |
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331 |
| 342 | 332 // this will enable a variety of different statistics per GC task |
| 333 #define _MARKING_STATS_ 0 | |
| 334 // this will enable the higher verbose levels | |
| 335 #define _MARKING_VERBOSE_ 0 | |
| 336 | |
| 337 #if _MARKING_STATS_ | |
| 338 #define statsOnly(statement) \ | |
| 339 do { \ | |
| 340 statement ; \ | |
| 341 } while (0) | |
| 342 #else // _MARKING_STATS_ | |
| 343 #define statsOnly(statement) \ | |
| 344 do { \ | |
| 345 } while (0) | |
| 346 #endif // _MARKING_STATS_ | |
| 347 | |
| 348 typedef enum { | |
| 349 no_verbose = 0, // verbose turned off | |
| 350 stats_verbose, // only prints stats at the end of marking | |
| 351 low_verbose, // low verbose, mostly per region and per major event | |
| 352 medium_verbose, // a bit more detailed than low | |
| 353 high_verbose // per object verbose | |
| 354 } CMVerboseLevel; | |
| 355 | |
| 356 | |
| 357 class ConcurrentMarkThread; | |
| 358 | |
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359 class ConcurrentMark: public CHeapObj { |
| 342 | 360 friend class ConcurrentMarkThread; |
| 361 friend class CMTask; | |
| 362 friend class CMBitMapClosure; | |
| 363 friend class CSMarkOopClosure; | |
| 364 friend class CMGlobalObjectClosure; | |
| 365 friend class CMRemarkTask; | |
| 366 friend class CMConcurrentMarkingTask; | |
| 367 friend class G1ParNoteEndTask; | |
| 368 friend class CalcLiveObjectsClosure; | |
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369 friend class G1RefProcTaskProxy; |
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370 friend class G1RefProcTaskExecutor; |
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371 friend class G1CMParKeepAliveAndDrainClosure; |
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372 friend class G1CMParDrainMarkingStackClosure; |
| 342 | 373 |
| 374 protected: | |
| 375 ConcurrentMarkThread* _cmThread; // the thread doing the work | |
| 376 G1CollectedHeap* _g1h; // the heap. | |
| 377 size_t _parallel_marking_threads; // the number of marking | |
| 378 // threads we'll use | |
| 379 double _sleep_factor; // how much we have to sleep, with | |
| 380 // respect to the work we just did, to | |
| 381 // meet the marking overhead goal | |
| 382 double _marking_task_overhead; // marking target overhead for | |
| 383 // a single task | |
| 384 | |
| 385 // same as the two above, but for the cleanup task | |
| 386 double _cleanup_sleep_factor; | |
| 387 double _cleanup_task_overhead; | |
| 388 | |
| 2152 | 389 FreeRegionList _cleanup_list; |
| 342 | 390 |
| 391 // CMS marking support structures | |
| 392 CMBitMap _markBitMap1; | |
| 393 CMBitMap _markBitMap2; | |
| 394 CMBitMapRO* _prevMarkBitMap; // completed mark bitmap | |
| 395 CMBitMap* _nextMarkBitMap; // under-construction mark bitmap | |
| 396 bool _at_least_one_mark_complete; | |
| 397 | |
| 398 BitMap _region_bm; | |
| 399 BitMap _card_bm; | |
| 400 | |
| 401 // Heap bounds | |
| 402 HeapWord* _heap_start; | |
| 403 HeapWord* _heap_end; | |
| 404 | |
| 405 // For gray objects | |
| 406 CMMarkStack _markStack; // Grey objects behind global finger. | |
| 407 CMRegionStack _regionStack; // Grey regions behind global finger. | |
| 408 HeapWord* volatile _finger; // the global finger, region aligned, | |
| 409 // always points to the end of the | |
| 410 // last claimed region | |
| 411 | |
| 412 // marking tasks | |
| 413 size_t _max_task_num; // maximum task number | |
| 414 size_t _active_tasks; // task num currently active | |
| 415 CMTask** _tasks; // task queue array (max_task_num len) | |
| 416 CMTaskQueueSet* _task_queues; // task queue set | |
| 417 ParallelTaskTerminator _terminator; // for termination | |
| 418 | |
| 419 // Two sync barriers that are used to synchronise tasks when an | |
| 420 // overflow occurs. The algorithm is the following. All tasks enter | |
| 421 // the first one to ensure that they have all stopped manipulating | |
| 422 // the global data structures. After they exit it, they re-initialise | |
| 423 // their data structures and task 0 re-initialises the global data | |
| 424 // structures. Then, they enter the second sync barrier. This | |
| 425 // ensure, that no task starts doing work before all data | |
| 426 // structures (local and global) have been re-initialised. When they | |
| 427 // exit it, they are free to start working again. | |
| 428 WorkGangBarrierSync _first_overflow_barrier_sync; | |
| 429 WorkGangBarrierSync _second_overflow_barrier_sync; | |
| 430 | |
| 431 | |
| 432 // this is set by any task, when an overflow on the global data | |
| 433 // structures is detected. | |
| 434 volatile bool _has_overflown; | |
| 435 // true: marking is concurrent, false: we're in remark | |
| 436 volatile bool _concurrent; | |
| 437 // set at the end of a Full GC so that marking aborts | |
| 438 volatile bool _has_aborted; | |
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439 |
| 342 | 440 // used when remark aborts due to an overflow to indicate that |
| 441 // another concurrent marking phase should start | |
| 442 volatile bool _restart_for_overflow; | |
| 443 | |
| 444 // This is true from the very start of concurrent marking until the | |
| 445 // point when all the tasks complete their work. It is really used | |
| 446 // to determine the points between the end of concurrent marking and | |
| 447 // time of remark. | |
| 448 volatile bool _concurrent_marking_in_progress; | |
| 449 | |
| 450 // verbose level | |
| 451 CMVerboseLevel _verbose_level; | |
| 452 | |
| 453 // These two fields are used to implement the optimisation that | |
| 454 // avoids pushing objects on the global/region stack if there are | |
| 455 // no collection set regions above the lowest finger. | |
| 456 | |
| 457 // This is the lowest finger (among the global and local fingers), | |
| 458 // which is calculated before a new collection set is chosen. | |
| 459 HeapWord* _min_finger; | |
| 460 // If this flag is true, objects/regions that are marked below the | |
| 461 // finger should be pushed on the stack(s). If this is flag is | |
| 462 // false, it is safe not to push them on the stack(s). | |
| 463 bool _should_gray_objects; | |
| 464 | |
| 465 // All of these times are in ms. | |
| 466 NumberSeq _init_times; | |
| 467 NumberSeq _remark_times; | |
| 468 NumberSeq _remark_mark_times; | |
| 469 NumberSeq _remark_weak_ref_times; | |
| 470 NumberSeq _cleanup_times; | |
| 471 double _total_counting_time; | |
| 472 double _total_rs_scrub_time; | |
| 473 | |
| 474 double* _accum_task_vtime; // accumulated task vtime | |
| 475 | |
| 476 WorkGang* _parallel_workers; | |
| 477 | |
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478 ForceOverflowSettings _force_overflow_conc; |
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479 ForceOverflowSettings _force_overflow_stw; |
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480 |
| 342 | 481 void weakRefsWork(bool clear_all_soft_refs); |
| 482 | |
| 483 void swapMarkBitMaps(); | |
| 484 | |
| 485 // It resets the global marking data structures, as well as the | |
| 486 // task local ones; should be called during initial mark. | |
| 487 void reset(); | |
| 488 // It resets all the marking data structures. | |
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489 void clear_marking_state(bool clear_overflow = true); |
| 342 | 490 |
| 491 // It should be called to indicate which phase we're in (concurrent | |
| 492 // mark or remark) and how many threads are currently active. | |
| 493 void set_phase(size_t active_tasks, bool concurrent); | |
| 494 // We do this after we're done with marking so that the marking data | |
| 495 // structures are initialised to a sensible and predictable state. | |
| 496 void set_non_marking_state(); | |
| 497 | |
| 498 // prints all gathered CM-related statistics | |
| 499 void print_stats(); | |
| 500 | |
| 2152 | 501 bool cleanup_list_is_empty() { |
| 502 return _cleanup_list.is_empty(); | |
| 503 } | |
| 504 | |
| 342 | 505 // accessor methods |
| 506 size_t parallel_marking_threads() { return _parallel_marking_threads; } | |
| 507 double sleep_factor() { return _sleep_factor; } | |
| 508 double marking_task_overhead() { return _marking_task_overhead;} | |
| 509 double cleanup_sleep_factor() { return _cleanup_sleep_factor; } | |
| 510 double cleanup_task_overhead() { return _cleanup_task_overhead;} | |
| 511 | |
| 512 HeapWord* finger() { return _finger; } | |
| 513 bool concurrent() { return _concurrent; } | |
| 514 size_t active_tasks() { return _active_tasks; } | |
| 515 ParallelTaskTerminator* terminator() { return &_terminator; } | |
| 516 | |
| 517 // It claims the next available region to be scanned by a marking | |
| 518 // task. It might return NULL if the next region is empty or we have | |
| 519 // run out of regions. In the latter case, out_of_regions() | |
| 520 // determines whether we've really run out of regions or the task | |
| 521 // should call claim_region() again. This might seem a bit | |
| 522 // awkward. Originally, the code was written so that claim_region() | |
| 523 // either successfully returned with a non-empty region or there | |
| 524 // were no more regions to be claimed. The problem with this was | |
| 525 // that, in certain circumstances, it iterated over large chunks of | |
| 526 // the heap finding only empty regions and, while it was working, it | |
| 527 // was preventing the calling task to call its regular clock | |
| 528 // method. So, this way, each task will spend very little time in | |
| 529 // claim_region() and is allowed to call the regular clock method | |
| 530 // frequently. | |
| 531 HeapRegion* claim_region(int task); | |
| 532 | |
| 533 // It determines whether we've run out of regions to scan. | |
| 534 bool out_of_regions() { return _finger == _heap_end; } | |
| 535 | |
| 536 // Returns the task with the given id | |
| 537 CMTask* task(int id) { | |
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538 assert(0 <= id && id < (int) _active_tasks, |
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539 "task id not within active bounds"); |
| 342 | 540 return _tasks[id]; |
| 541 } | |
| 542 | |
| 543 // Returns the task queue with the given id | |
| 544 CMTaskQueue* task_queue(int id) { | |
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545 assert(0 <= id && id < (int) _active_tasks, |
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546 "task queue id not within active bounds"); |
| 342 | 547 return (CMTaskQueue*) _task_queues->queue(id); |
| 548 } | |
| 549 | |
| 550 // Returns the task queue set | |
| 551 CMTaskQueueSet* task_queues() { return _task_queues; } | |
| 552 | |
| 553 // Access / manipulation of the overflow flag which is set to | |
| 554 // indicate that the global stack or region stack has overflown | |
| 555 bool has_overflown() { return _has_overflown; } | |
| 556 void set_has_overflown() { _has_overflown = true; } | |
| 557 void clear_has_overflown() { _has_overflown = false; } | |
| 558 | |
| 559 bool has_aborted() { return _has_aborted; } | |
| 560 bool restart_for_overflow() { return _restart_for_overflow; } | |
| 561 | |
| 562 // Methods to enter the two overflow sync barriers | |
| 563 void enter_first_sync_barrier(int task_num); | |
| 564 void enter_second_sync_barrier(int task_num); | |
| 565 | |
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566 ForceOverflowSettings* force_overflow_conc() { |
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567 return &_force_overflow_conc; |
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568 } |
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569 |
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570 ForceOverflowSettings* force_overflow_stw() { |
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571 return &_force_overflow_stw; |
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572 } |
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573 |
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574 ForceOverflowSettings* force_overflow() { |
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575 if (concurrent()) { |
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576 return force_overflow_conc(); |
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577 } else { |
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578 return force_overflow_stw(); |
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579 } |
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580 } |
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581 |
| 342 | 582 public: |
| 583 // Manipulation of the global mark stack. | |
| 584 // Notice that the first mark_stack_push is CAS-based, whereas the | |
| 585 // two below are Mutex-based. This is OK since the first one is only | |
| 586 // called during evacuation pauses and doesn't compete with the | |
| 587 // other two (which are called by the marking tasks during | |
| 588 // concurrent marking or remark). | |
| 589 bool mark_stack_push(oop p) { | |
| 590 _markStack.par_push(p); | |
| 591 if (_markStack.overflow()) { | |
| 592 set_has_overflown(); | |
| 593 return false; | |
| 594 } | |
| 595 return true; | |
| 596 } | |
| 597 bool mark_stack_push(oop* arr, int n) { | |
| 598 _markStack.par_push_arr(arr, n); | |
| 599 if (_markStack.overflow()) { | |
| 600 set_has_overflown(); | |
| 601 return false; | |
| 602 } | |
| 603 return true; | |
| 604 } | |
| 605 void mark_stack_pop(oop* arr, int max, int* n) { | |
| 606 _markStack.par_pop_arr(arr, max, n); | |
| 607 } | |
| 608 size_t mark_stack_size() { return _markStack.size(); } | |
| 609 size_t partial_mark_stack_size_target() { return _markStack.maxElems()/3; } | |
| 610 bool mark_stack_overflow() { return _markStack.overflow(); } | |
| 611 bool mark_stack_empty() { return _markStack.isEmpty(); } | |
| 612 | |
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613 // (Lock-free) Manipulation of the region stack |
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614 bool region_stack_push_lock_free(MemRegion mr) { |
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615 // Currently we only call the lock-free version during evacuation |
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616 // pauses. |
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617 assert(SafepointSynchronize::is_at_safepoint(), "world should be stopped"); |
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618 |
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619 _regionStack.push_lock_free(mr); |
| 342 | 620 if (_regionStack.overflow()) { |
| 621 set_has_overflown(); | |
| 622 return false; | |
| 623 } | |
| 624 return true; | |
| 625 } | |
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626 |
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627 // Lock-free version of region-stack pop. Should only be |
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628 // called in tandem with other lock-free pops. |
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629 MemRegion region_stack_pop_lock_free() { |
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630 return _regionStack.pop_lock_free(); |
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631 } |
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632 |
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633 #if 0 |
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634 // The routines that manipulate the region stack with a lock are |
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635 // not currently used. They should be retained, however, as a |
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636 // diagnostic aid. |
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637 |
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638 bool region_stack_push_with_lock(MemRegion mr) { |
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639 // Currently we only call the lock-based version during either |
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640 // concurrent marking or remark. |
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641 assert(!SafepointSynchronize::is_at_safepoint() || !concurrent(), |
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642 "if we are at a safepoint it should be the remark safepoint"); |
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643 |
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644 _regionStack.push_with_lock(mr); |
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645 if (_regionStack.overflow()) { |
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646 set_has_overflown(); |
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647 return false; |
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648 } |
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649 return true; |
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650 } |
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651 |
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652 MemRegion region_stack_pop_with_lock() { |
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653 // Currently we only call the lock-based version during either |
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654 // concurrent marking or remark. |
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655 assert(!SafepointSynchronize::is_at_safepoint() || !concurrent(), |
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656 "if we are at a safepoint it should be the remark safepoint"); |
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657 |
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658 return _regionStack.pop_with_lock(); |
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659 } |
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660 #endif |
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661 |
| 342 | 662 int region_stack_size() { return _regionStack.size(); } |
| 663 bool region_stack_overflow() { return _regionStack.overflow(); } | |
| 664 bool region_stack_empty() { return _regionStack.isEmpty(); } | |
| 665 | |
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666 // Iterate over any regions that were aborted while draining the |
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667 // region stack (any such regions are saved in the corresponding |
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668 // CMTask) and invalidate (i.e. assign to the empty MemRegion()) |
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669 // any regions that point into the collection set. |
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670 bool invalidate_aborted_regions_in_cset(); |
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671 |
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672 // Returns true if there are any aborted memory regions. |
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673 bool has_aborted_regions(); |
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674 |
| 342 | 675 bool concurrent_marking_in_progress() { |
| 676 return _concurrent_marking_in_progress; | |
| 677 } | |
| 678 void set_concurrent_marking_in_progress() { | |
| 679 _concurrent_marking_in_progress = true; | |
| 680 } | |
| 681 void clear_concurrent_marking_in_progress() { | |
| 682 _concurrent_marking_in_progress = false; | |
| 683 } | |
| 684 | |
| 685 void update_accum_task_vtime(int i, double vtime) { | |
| 686 _accum_task_vtime[i] += vtime; | |
| 687 } | |
| 688 | |
| 689 double all_task_accum_vtime() { | |
| 690 double ret = 0.0; | |
| 691 for (int i = 0; i < (int)_max_task_num; ++i) | |
| 692 ret += _accum_task_vtime[i]; | |
| 693 return ret; | |
| 694 } | |
| 695 | |
| 696 // Attempts to steal an object from the task queues of other tasks | |
| 697 bool try_stealing(int task_num, int* hash_seed, oop& obj) { | |
| 698 return _task_queues->steal(task_num, hash_seed, obj); | |
| 699 } | |
| 700 | |
| 701 // It grays an object by first marking it. Then, if it's behind the | |
| 702 // global finger, it also pushes it on the global stack. | |
| 703 void deal_with_reference(oop obj); | |
| 704 | |
| 705 ConcurrentMark(ReservedSpace rs, int max_regions); | |
| 706 ~ConcurrentMark(); | |
| 707 ConcurrentMarkThread* cmThread() { return _cmThread; } | |
| 708 | |
| 709 CMBitMapRO* prevMarkBitMap() const { return _prevMarkBitMap; } | |
| 710 CMBitMap* nextMarkBitMap() const { return _nextMarkBitMap; } | |
| 711 | |
| 712 // The following three are interaction between CM and | |
| 713 // G1CollectedHeap | |
| 714 | |
| 715 // This notifies CM that a root during initial-mark needs to be | |
| 716 // grayed and it's MT-safe. Currently, we just mark it. But, in the | |
| 717 // future, we can experiment with pushing it on the stack and we can | |
| 718 // do this without changing G1CollectedHeap. | |
| 719 void grayRoot(oop p); | |
| 720 // It's used during evacuation pauses to gray a region, if | |
| 721 // necessary, and it's MT-safe. It assumes that the caller has | |
| 722 // marked any objects on that region. If _should_gray_objects is | |
| 723 // true and we're still doing concurrent marking, the region is | |
| 724 // pushed on the region stack, if it is located below the global | |
| 725 // finger, otherwise we do nothing. | |
| 726 void grayRegionIfNecessary(MemRegion mr); | |
| 727 // It's used during evacuation pauses to mark and, if necessary, | |
| 728 // gray a single object and it's MT-safe. It assumes the caller did | |
| 729 // not mark the object. If _should_gray_objects is true and we're | |
| 730 // still doing concurrent marking, the objects is pushed on the | |
| 731 // global stack, if it is located below the global finger, otherwise | |
| 732 // we do nothing. | |
| 733 void markAndGrayObjectIfNecessary(oop p); | |
| 734 | |
| 1388 | 735 // It iterates over the heap and for each object it comes across it |
| 736 // will dump the contents of its reference fields, as well as | |
| 737 // liveness information for the object and its referents. The dump | |
| 738 // will be written to a file with the following name: | |
|
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739 // G1PrintReachableBaseFile + "." + str. |
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740 // vo decides whether the prev (vo == UsePrevMarking), the next |
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741 // (vo == UseNextMarking) marking information, or the mark word |
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742 // (vo == UseMarkWord) will be used to determine the liveness of |
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743 // each object / referent. |
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744 // If all is true, all objects in the heap will be dumped, otherwise |
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745 // only the live ones. In the dump the following symbols / breviations |
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746 // are used: |
| 1388 | 747 // M : an explicitly live object (its bitmap bit is set) |
| 748 // > : an implicitly live object (over tams) | |
| 749 // O : an object outside the G1 heap (typically: in the perm gen) | |
| 750 // NOT : a reference field whose referent is not live | |
| 751 // AND MARKED : indicates that an object is both explicitly and | |
| 752 // implicitly live (it should be one or the other, not both) | |
| 753 void print_reachable(const char* str, | |
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754 VerifyOption vo, bool all) PRODUCT_RETURN; |
| 342 | 755 |
| 756 // Clear the next marking bitmap (will be called concurrently). | |
| 757 void clearNextBitmap(); | |
| 758 | |
| 759 // main CMS steps and related support | |
| 760 void checkpointRootsInitial(); | |
| 761 | |
| 762 // These two do the work that needs to be done before and after the | |
| 763 // initial root checkpoint. Since this checkpoint can be done at two | |
| 764 // different points (i.e. an explicit pause or piggy-backed on a | |
| 765 // young collection), then it's nice to be able to easily share the | |
| 766 // pre/post code. It might be the case that we can put everything in | |
| 767 // the post method. TP | |
| 768 void checkpointRootsInitialPre(); | |
| 769 void checkpointRootsInitialPost(); | |
| 770 | |
| 771 // Do concurrent phase of marking, to a tentative transitive closure. | |
| 772 void markFromRoots(); | |
| 773 | |
| 774 // Process all unprocessed SATB buffers. It is called at the | |
| 775 // beginning of an evacuation pause. | |
| 776 void drainAllSATBBuffers(); | |
| 777 | |
| 778 void checkpointRootsFinal(bool clear_all_soft_refs); | |
| 779 void checkpointRootsFinalWork(); | |
| 780 void calcDesiredRegions(); | |
| 781 void cleanup(); | |
| 782 void completeCleanup(); | |
| 783 | |
| 784 // Mark in the previous bitmap. NB: this is usually read-only, so use | |
| 785 // this carefully! | |
| 786 void markPrev(oop p); | |
| 787 void clear(oop p); | |
| 788 // Clears marks for all objects in the given range, for both prev and | |
| 789 // next bitmaps. NB: the previous bitmap is usually read-only, so use | |
| 790 // this carefully! | |
| 791 void clearRangeBothMaps(MemRegion mr); | |
| 792 | |
| 793 // Record the current top of the mark and region stacks; a | |
| 794 // subsequent oops_do() on the mark stack and | |
| 795 // invalidate_entries_into_cset() on the region stack will iterate | |
| 796 // only over indices valid at the time of this call. | |
| 797 void set_oops_do_bound() { | |
| 798 _markStack.set_oops_do_bound(); | |
| 799 _regionStack.set_oops_do_bound(); | |
| 800 } | |
| 801 // Iterate over the oops in the mark stack and all local queues. It | |
| 802 // also calls invalidate_entries_into_cset() on the region stack. | |
| 803 void oops_do(OopClosure* f); | |
| 804 // It is called at the end of an evacuation pause during marking so | |
| 805 // that CM is notified of where the new end of the heap is. It | |
| 806 // doesn't do anything if concurrent_marking_in_progress() is false, | |
| 807 // unless the force parameter is true. | |
| 808 void update_g1_committed(bool force = false); | |
| 809 | |
| 810 void complete_marking_in_collection_set(); | |
| 811 | |
| 812 // It indicates that a new collection set is being chosen. | |
| 813 void newCSet(); | |
|
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814 |
| 342 | 815 // It registers a collection set heap region with CM. This is used |
| 816 // to determine whether any heap regions are located above the finger. | |
| 817 void registerCSetRegion(HeapRegion* hr); | |
| 818 | |
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819 // Resets the region fields of any active CMTask whose region fields |
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820 // are in the collection set (i.e. the region currently claimed by |
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821 // the CMTask will be evacuated and may be used, subsequently, as |
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822 // an alloc region). When this happens the region fields in the CMTask |
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823 // are stale and, hence, should be cleared causing the worker thread |
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824 // to claim a new region. |
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825 void reset_active_task_region_fields_in_cset(); |
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826 |
|
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827 // Registers the maximum region-end associated with a set of |
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828 // regions with CM. Again this is used to determine whether any |
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829 // heap regions are located above the finger. |
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830 void register_collection_set_finger(HeapWord* max_finger) { |
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831 // max_finger is the highest heap region end of the regions currently |
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832 // contained in the collection set. If this value is larger than |
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833 // _min_finger then we need to gray objects. |
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834 // This routine is like registerCSetRegion but for an entire |
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835 // collection of regions. |
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836 if (max_finger > _min_finger) |
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837 _should_gray_objects = true; |
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838 } |
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839 |
| 342 | 840 // Returns "true" if at least one mark has been completed. |
| 841 bool at_least_one_mark_complete() { return _at_least_one_mark_complete; } | |
| 842 | |
| 843 bool isMarked(oop p) const { | |
| 844 assert(p != NULL && p->is_oop(), "expected an oop"); | |
| 845 HeapWord* addr = (HeapWord*)p; | |
| 846 assert(addr >= _nextMarkBitMap->startWord() || | |
| 847 addr < _nextMarkBitMap->endWord(), "in a region"); | |
| 848 | |
| 849 return _nextMarkBitMap->isMarked(addr); | |
| 850 } | |
| 851 | |
| 852 inline bool not_yet_marked(oop p) const; | |
| 853 | |
| 854 // XXX Debug code | |
| 855 bool containing_card_is_marked(void* p); | |
| 856 bool containing_cards_are_marked(void* start, void* last); | |
| 857 | |
| 858 bool isPrevMarked(oop p) const { | |
| 859 assert(p != NULL && p->is_oop(), "expected an oop"); | |
| 860 HeapWord* addr = (HeapWord*)p; | |
| 861 assert(addr >= _prevMarkBitMap->startWord() || | |
| 862 addr < _prevMarkBitMap->endWord(), "in a region"); | |
| 863 | |
| 864 return _prevMarkBitMap->isMarked(addr); | |
| 865 } | |
| 866 | |
| 867 inline bool do_yield_check(int worker_i = 0); | |
| 868 inline bool should_yield(); | |
| 869 | |
| 870 // Called to abort the marking cycle after a Full GC takes palce. | |
| 871 void abort(); | |
| 872 | |
| 873 // This prints the global/local fingers. It is used for debugging. | |
| 874 NOT_PRODUCT(void print_finger();) | |
| 875 | |
| 876 void print_summary_info(); | |
| 877 | |
| 1019 | 878 void print_worker_threads_on(outputStream* st) const; |
| 879 | |
| 342 | 880 // The following indicate whether a given verbose level has been |
| 881 // set. Notice that anything above stats is conditional to | |
| 882 // _MARKING_VERBOSE_ having been set to 1 | |
| 883 bool verbose_stats() | |
| 884 { return _verbose_level >= stats_verbose; } | |
| 885 bool verbose_low() | |
| 886 { return _MARKING_VERBOSE_ && _verbose_level >= low_verbose; } | |
| 887 bool verbose_medium() | |
| 888 { return _MARKING_VERBOSE_ && _verbose_level >= medium_verbose; } | |
| 889 bool verbose_high() | |
| 890 { return _MARKING_VERBOSE_ && _verbose_level >= high_verbose; } | |
| 891 }; | |
| 892 | |
| 893 // A class representing a marking task. | |
| 894 class CMTask : public TerminatorTerminator { | |
| 895 private: | |
| 896 enum PrivateConstants { | |
| 897 // the regular clock call is called once the scanned words reaches | |
| 898 // this limit | |
| 899 words_scanned_period = 12*1024, | |
| 900 // the regular clock call is called once the number of visited | |
| 901 // references reaches this limit | |
| 902 refs_reached_period = 384, | |
| 903 // initial value for the hash seed, used in the work stealing code | |
| 904 init_hash_seed = 17, | |
| 905 // how many entries will be transferred between global stack and | |
| 906 // local queues | |
| 907 global_stack_transfer_size = 16 | |
| 908 }; | |
| 909 | |
| 910 int _task_id; | |
| 911 G1CollectedHeap* _g1h; | |
| 912 ConcurrentMark* _cm; | |
| 913 CMBitMap* _nextMarkBitMap; | |
| 914 // the task queue of this task | |
| 915 CMTaskQueue* _task_queue; | |
|
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916 private: |
| 342 | 917 // the task queue set---needed for stealing |
| 918 CMTaskQueueSet* _task_queues; | |
| 919 // indicates whether the task has been claimed---this is only for | |
| 920 // debugging purposes | |
| 921 bool _claimed; | |
| 922 | |
| 923 // number of calls to this task | |
| 924 int _calls; | |
| 925 | |
| 926 // when the virtual timer reaches this time, the marking step should | |
| 927 // exit | |
| 928 double _time_target_ms; | |
| 929 // the start time of the current marking step | |
| 930 double _start_time_ms; | |
| 931 | |
| 932 // the oop closure used for iterations over oops | |
| 3771 | 933 G1CMOopClosure* _cm_oop_closure; |
| 342 | 934 |
| 935 // the region this task is scanning, NULL if we're not scanning any | |
| 936 HeapRegion* _curr_region; | |
| 937 // the local finger of this task, NULL if we're not scanning a region | |
| 938 HeapWord* _finger; | |
| 939 // limit of the region this task is scanning, NULL if we're not scanning one | |
| 940 HeapWord* _region_limit; | |
| 941 | |
| 942 // This is used only when we scan regions popped from the region | |
| 943 // stack. It records what the last object on such a region we | |
| 944 // scanned was. It is used to ensure that, if we abort region | |
| 945 // iteration, we do not rescan the first part of the region. This | |
| 946 // should be NULL when we're not scanning a region from the region | |
| 947 // stack. | |
| 948 HeapWord* _region_finger; | |
| 949 | |
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950 // If we abort while scanning a region we record the remaining |
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951 // unscanned portion and check this field when marking restarts. |
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952 // This avoids having to push on the region stack while other |
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953 // marking threads may still be popping regions. |
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954 // If we were to push the unscanned portion directly to the |
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955 // region stack then we would need to using locking versions |
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956 // of the push and pop operations. |
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957 MemRegion _aborted_region; |
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958 |
| 342 | 959 // the number of words this task has scanned |
| 960 size_t _words_scanned; | |
| 961 // When _words_scanned reaches this limit, the regular clock is | |
| 962 // called. Notice that this might be decreased under certain | |
| 963 // circumstances (i.e. when we believe that we did an expensive | |
| 964 // operation). | |
| 965 size_t _words_scanned_limit; | |
| 966 // the initial value of _words_scanned_limit (i.e. what it was | |
| 967 // before it was decreased). | |
| 968 size_t _real_words_scanned_limit; | |
| 969 | |
| 970 // the number of references this task has visited | |
| 971 size_t _refs_reached; | |
| 972 // When _refs_reached reaches this limit, the regular clock is | |
| 973 // called. Notice this this might be decreased under certain | |
| 974 // circumstances (i.e. when we believe that we did an expensive | |
| 975 // operation). | |
| 976 size_t _refs_reached_limit; | |
| 977 // the initial value of _refs_reached_limit (i.e. what it was before | |
| 978 // it was decreased). | |
| 979 size_t _real_refs_reached_limit; | |
| 980 | |
| 981 // used by the work stealing stuff | |
| 982 int _hash_seed; | |
| 983 // if this is true, then the task has aborted for some reason | |
| 984 bool _has_aborted; | |
| 985 // set when the task aborts because it has met its time quota | |
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986 bool _has_timed_out; |
| 342 | 987 // true when we're draining SATB buffers; this avoids the task |
| 988 // aborting due to SATB buffers being available (as we're already | |
| 989 // dealing with them) | |
| 990 bool _draining_satb_buffers; | |
| 991 | |
| 992 // number sequence of past step times | |
| 993 NumberSeq _step_times_ms; | |
| 994 // elapsed time of this task | |
| 995 double _elapsed_time_ms; | |
| 996 // termination time of this task | |
| 997 double _termination_time_ms; | |
| 998 // when this task got into the termination protocol | |
| 999 double _termination_start_time_ms; | |
| 1000 | |
| 1001 // true when the task is during a concurrent phase, false when it is | |
| 1002 // in the remark phase (so, in the latter case, we do not have to | |
| 1003 // check all the things that we have to check during the concurrent | |
| 1004 // phase, i.e. SATB buffer availability...) | |
| 1005 bool _concurrent; | |
| 1006 | |
| 1007 TruncatedSeq _marking_step_diffs_ms; | |
| 1008 | |
| 1009 // LOTS of statistics related with this task | |
| 1010 #if _MARKING_STATS_ | |
| 1011 NumberSeq _all_clock_intervals_ms; | |
| 1012 double _interval_start_time_ms; | |
| 1013 | |
| 1014 int _aborted; | |
| 1015 int _aborted_overflow; | |
| 1016 int _aborted_cm_aborted; | |
| 1017 int _aborted_yield; | |
| 1018 int _aborted_timed_out; | |
| 1019 int _aborted_satb; | |
| 1020 int _aborted_termination; | |
| 1021 | |
| 1022 int _steal_attempts; | |
| 1023 int _steals; | |
| 1024 | |
| 1025 int _clock_due_to_marking; | |
| 1026 int _clock_due_to_scanning; | |
| 1027 | |
| 1028 int _local_pushes; | |
| 1029 int _local_pops; | |
| 1030 int _local_max_size; | |
| 1031 int _objs_scanned; | |
| 1032 | |
| 1033 int _global_pushes; | |
| 1034 int _global_pops; | |
| 1035 int _global_max_size; | |
| 1036 | |
| 1037 int _global_transfers_to; | |
| 1038 int _global_transfers_from; | |
| 1039 | |
| 1040 int _region_stack_pops; | |
| 1041 | |
| 1042 int _regions_claimed; | |
| 1043 int _objs_found_on_bitmap; | |
| 1044 | |
| 1045 int _satb_buffers_processed; | |
| 1046 #endif // _MARKING_STATS_ | |
| 1047 | |
| 1048 // it updates the local fields after this task has claimed | |
| 1049 // a new region to scan | |
| 1050 void setup_for_region(HeapRegion* hr); | |
| 1051 // it brings up-to-date the limit of the region | |
| 1052 void update_region_limit(); | |
| 1053 | |
| 1054 // called when either the words scanned or the refs visited limit | |
| 1055 // has been reached | |
| 1056 void reached_limit(); | |
| 1057 // recalculates the words scanned and refs visited limits | |
| 1058 void recalculate_limits(); | |
| 1059 // decreases the words scanned and refs visited limits when we reach | |
| 1060 // an expensive operation | |
| 1061 void decrease_limits(); | |
| 1062 // it checks whether the words scanned or refs visited reached their | |
| 1063 // respective limit and calls reached_limit() if they have | |
| 1064 void check_limits() { | |
| 1065 if (_words_scanned >= _words_scanned_limit || | |
| 1066 _refs_reached >= _refs_reached_limit) | |
| 1067 reached_limit(); | |
| 1068 } | |
| 1069 // this is supposed to be called regularly during a marking step as | |
| 1070 // it checks a bunch of conditions that might cause the marking step | |
| 1071 // to abort | |
| 1072 void regular_clock_call(); | |
| 1073 bool concurrent() { return _concurrent; } | |
| 1074 | |
| 1075 public: | |
| 1076 // It resets the task; it should be called right at the beginning of | |
| 1077 // a marking phase. | |
| 1078 void reset(CMBitMap* _nextMarkBitMap); | |
| 1079 // it clears all the fields that correspond to a claimed region. | |
| 1080 void clear_region_fields(); | |
| 1081 | |
| 1082 void set_concurrent(bool concurrent) { _concurrent = concurrent; } | |
| 1083 | |
| 1084 // The main method of this class which performs a marking step | |
| 1085 // trying not to exceed the given duration. However, it might exit | |
| 1086 // prematurely, according to some conditions (i.e. SATB buffers are | |
| 1087 // available for processing). | |
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1088 void do_marking_step(double target_ms, bool do_stealing, bool do_termination); |
| 342 | 1089 |
| 1090 // These two calls start and stop the timer | |
| 1091 void record_start_time() { | |
| 1092 _elapsed_time_ms = os::elapsedTime() * 1000.0; | |
| 1093 } | |
| 1094 void record_end_time() { | |
| 1095 _elapsed_time_ms = os::elapsedTime() * 1000.0 - _elapsed_time_ms; | |
| 1096 } | |
| 1097 | |
| 1098 // returns the task ID | |
| 1099 int task_id() { return _task_id; } | |
| 1100 | |
| 1101 // From TerminatorTerminator. It determines whether this task should | |
| 1102 // exit the termination protocol after it's entered it. | |
| 1103 virtual bool should_exit_termination(); | |
| 1104 | |
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1105 // Resets the local region fields after a task has finished scanning a |
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1106 // region; or when they have become stale as a result of the region |
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1107 // being evacuated. |
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1108 void giveup_current_region(); |
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1109 |
| 342 | 1110 HeapWord* finger() { return _finger; } |
| 1111 | |
| 1112 bool has_aborted() { return _has_aborted; } | |
| 1113 void set_has_aborted() { _has_aborted = true; } | |
| 1114 void clear_has_aborted() { _has_aborted = false; } | |
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1115 bool has_timed_out() { return _has_timed_out; } |
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1116 bool claimed() { return _claimed; } |
| 342 | 1117 |
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1118 // Support routines for the partially scanned region that may be |
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1119 // recorded as a result of aborting while draining the CMRegionStack |
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1120 MemRegion aborted_region() { return _aborted_region; } |
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1121 void set_aborted_region(MemRegion mr) |
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1122 { _aborted_region = mr; } |
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1123 |
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1124 // Clears any recorded partially scanned region |
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1125 void clear_aborted_region() { set_aborted_region(MemRegion()); } |
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1126 |
| 3771 | 1127 void set_cm_oop_closure(G1CMOopClosure* cm_oop_closure); |
| 342 | 1128 |
| 1129 // It grays the object by marking it and, if necessary, pushing it | |
| 1130 // on the local queue | |
| 3771 | 1131 inline void deal_with_reference(oop obj); |
| 342 | 1132 |
| 1133 // It scans an object and visits its children. | |
| 3771 | 1134 void scan_object(oop obj); |
| 342 | 1135 |
| 1136 // It pushes an object on the local queue. | |
| 3771 | 1137 inline void push(oop obj); |
| 342 | 1138 |
| 1139 // These two move entries to/from the global stack. | |
| 1140 void move_entries_to_global_stack(); | |
| 1141 void get_entries_from_global_stack(); | |
| 1142 | |
| 1143 // It pops and scans objects from the local queue. If partially is | |
| 1144 // true, then it stops when the queue size is of a given limit. If | |
| 1145 // partially is false, then it stops when the queue is empty. | |
| 1146 void drain_local_queue(bool partially); | |
| 1147 // It moves entries from the global stack to the local queue and | |
| 1148 // drains the local queue. If partially is true, then it stops when | |
| 1149 // both the global stack and the local queue reach a given size. If | |
| 1150 // partially if false, it tries to empty them totally. | |
| 1151 void drain_global_stack(bool partially); | |
| 1152 // It keeps picking SATB buffers and processing them until no SATB | |
| 1153 // buffers are available. | |
| 1154 void drain_satb_buffers(); | |
| 1155 // It keeps popping regions from the region stack and processing | |
| 1156 // them until the region stack is empty. | |
| 1157 void drain_region_stack(BitMapClosure* closure); | |
| 1158 | |
| 1159 // moves the local finger to a new location | |
| 1160 inline void move_finger_to(HeapWord* new_finger) { | |
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1161 assert(new_finger >= _finger && new_finger < _region_limit, "invariant"); |
| 342 | 1162 _finger = new_finger; |
| 1163 } | |
| 1164 | |
| 1165 // moves the region finger to a new location | |
| 1166 inline void move_region_finger_to(HeapWord* new_finger) { | |
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1167 assert(new_finger < _cm->finger(), "invariant"); |
| 342 | 1168 _region_finger = new_finger; |
| 1169 } | |
| 1170 | |
| 1171 CMTask(int task_num, ConcurrentMark *cm, | |
| 1172 CMTaskQueue* task_queue, CMTaskQueueSet* task_queues); | |
| 1173 | |
| 1174 // it prints statistics associated with this task | |
| 1175 void print_stats(); | |
| 1176 | |
| 1177 #if _MARKING_STATS_ | |
| 1178 void increase_objs_found_on_bitmap() { ++_objs_found_on_bitmap; } | |
| 1179 #endif // _MARKING_STATS_ | |
| 1180 }; | |
| 1972 | 1181 |
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1182 // Class that's used to to print out per-region liveness |
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1183 // information. It's currently used at the end of marking and also |
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1184 // after we sort the old regions at the end of the cleanup operation. |
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1185 class G1PrintRegionLivenessInfoClosure: public HeapRegionClosure { |
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1186 private: |
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1187 outputStream* _out; |
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1188 |
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1189 // Accumulators for these values. |
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1190 size_t _total_used_bytes; |
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1191 size_t _total_capacity_bytes; |
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1192 size_t _total_prev_live_bytes; |
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1193 size_t _total_next_live_bytes; |
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1194 |
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1195 // These are set up when we come across a "stars humongous" region |
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1196 // (as this is where most of this information is stored, not in the |
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1197 // subsequent "continues humongous" regions). After that, for every |
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1198 // region in a given humongous region series we deduce the right |
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1199 // values for it by simply subtracting the appropriate amount from |
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1200 // these fields. All these values should reach 0 after we've visited |
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1201 // the last region in the series. |
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1202 size_t _hum_used_bytes; |
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1203 size_t _hum_capacity_bytes; |
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1204 size_t _hum_prev_live_bytes; |
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1205 size_t _hum_next_live_bytes; |
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1206 |
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1207 static double perc(size_t val, size_t total) { |
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1208 if (total == 0) { |
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1209 return 0.0; |
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1210 } else { |
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1211 return 100.0 * ((double) val / (double) total); |
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1212 } |
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1213 } |
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1214 |
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1215 static double bytes_to_mb(size_t val) { |
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1216 return (double) val / (double) M; |
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1217 } |
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1218 |
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1219 // See the .cpp file. |
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1220 size_t get_hum_bytes(size_t* hum_bytes); |
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1221 void get_hum_bytes(size_t* used_bytes, size_t* capacity_bytes, |
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1222 size_t* prev_live_bytes, size_t* next_live_bytes); |
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1223 |
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1224 public: |
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1225 // The header and footer are printed in the constructor and |
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1226 // destructor respectively. |
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1227 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name); |
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1228 virtual bool doHeapRegion(HeapRegion* r); |
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1229 ~G1PrintRegionLivenessInfoClosure(); |
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1230 }; |
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1231 |
| 1972 | 1232 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP |