Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.hpp @ 4711:adedfbbf0360
7120038: G1: ParallelGCThreads==0 is broken
Summary: Running G1 with ParallelGCThreads==0 results in various crashes and asserts. Most of these are caused by unguarded references to the worker threads array or an incorrect number of active workers.
Reviewed-by: jmasa, tonyp
| author | johnc |
|---|---|
| date | Fri, 16 Dec 2011 11:40:00 -0800 |
| parents | dc467e8b2c5e |
| children | 441e946dc1af |
| 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; | |
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363 friend class CSetMarkOopClosure; |
| 342 | 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 G1CMRefProcTaskProxy; |
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370 friend class G1CMRefProcTaskExecutor; |
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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 | |
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378 // threads we're use |
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379 size_t _max_parallel_marking_threads; // max number of marking |
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380 // threads we'll ever use |
| 342 | 381 double _sleep_factor; // how much we have to sleep, with |
| 382 // respect to the work we just did, to | |
| 383 // meet the marking overhead goal | |
| 384 double _marking_task_overhead; // marking target overhead for | |
| 385 // a single task | |
| 386 | |
| 387 // same as the two above, but for the cleanup task | |
| 388 double _cleanup_sleep_factor; | |
| 389 double _cleanup_task_overhead; | |
| 390 | |
| 2152 | 391 FreeRegionList _cleanup_list; |
| 342 | 392 |
| 393 // CMS marking support structures | |
| 394 CMBitMap _markBitMap1; | |
| 395 CMBitMap _markBitMap2; | |
| 396 CMBitMapRO* _prevMarkBitMap; // completed mark bitmap | |
| 397 CMBitMap* _nextMarkBitMap; // under-construction mark bitmap | |
| 398 bool _at_least_one_mark_complete; | |
| 399 | |
| 400 BitMap _region_bm; | |
| 401 BitMap _card_bm; | |
| 402 | |
| 403 // Heap bounds | |
| 404 HeapWord* _heap_start; | |
| 405 HeapWord* _heap_end; | |
| 406 | |
| 407 // For gray objects | |
| 408 CMMarkStack _markStack; // Grey objects behind global finger. | |
| 409 CMRegionStack _regionStack; // Grey regions behind global finger. | |
| 410 HeapWord* volatile _finger; // the global finger, region aligned, | |
| 411 // always points to the end of the | |
| 412 // last claimed region | |
| 413 | |
| 414 // marking tasks | |
| 415 size_t _max_task_num; // maximum task number | |
| 416 size_t _active_tasks; // task num currently active | |
| 417 CMTask** _tasks; // task queue array (max_task_num len) | |
| 418 CMTaskQueueSet* _task_queues; // task queue set | |
| 419 ParallelTaskTerminator _terminator; // for termination | |
| 420 | |
| 421 // Two sync barriers that are used to synchronise tasks when an | |
| 422 // overflow occurs. The algorithm is the following. All tasks enter | |
| 423 // the first one to ensure that they have all stopped manipulating | |
| 424 // the global data structures. After they exit it, they re-initialise | |
| 425 // their data structures and task 0 re-initialises the global data | |
| 426 // structures. Then, they enter the second sync barrier. This | |
| 427 // ensure, that no task starts doing work before all data | |
| 428 // structures (local and global) have been re-initialised. When they | |
| 429 // exit it, they are free to start working again. | |
| 430 WorkGangBarrierSync _first_overflow_barrier_sync; | |
| 431 WorkGangBarrierSync _second_overflow_barrier_sync; | |
| 432 | |
| 433 | |
| 434 // this is set by any task, when an overflow on the global data | |
| 435 // structures is detected. | |
| 436 volatile bool _has_overflown; | |
| 437 // true: marking is concurrent, false: we're in remark | |
| 438 volatile bool _concurrent; | |
| 439 // set at the end of a Full GC so that marking aborts | |
| 440 volatile bool _has_aborted; | |
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441 |
| 342 | 442 // used when remark aborts due to an overflow to indicate that |
| 443 // another concurrent marking phase should start | |
| 444 volatile bool _restart_for_overflow; | |
| 445 | |
| 446 // This is true from the very start of concurrent marking until the | |
| 447 // point when all the tasks complete their work. It is really used | |
| 448 // to determine the points between the end of concurrent marking and | |
| 449 // time of remark. | |
| 450 volatile bool _concurrent_marking_in_progress; | |
| 451 | |
| 452 // verbose level | |
| 453 CMVerboseLevel _verbose_level; | |
| 454 | |
| 455 // These two fields are used to implement the optimisation that | |
| 456 // avoids pushing objects on the global/region stack if there are | |
| 457 // no collection set regions above the lowest finger. | |
| 458 | |
| 459 // This is the lowest finger (among the global and local fingers), | |
| 460 // which is calculated before a new collection set is chosen. | |
| 461 HeapWord* _min_finger; | |
| 462 // If this flag is true, objects/regions that are marked below the | |
| 463 // finger should be pushed on the stack(s). If this is flag is | |
| 464 // false, it is safe not to push them on the stack(s). | |
| 465 bool _should_gray_objects; | |
| 466 | |
| 467 // All of these times are in ms. | |
| 468 NumberSeq _init_times; | |
| 469 NumberSeq _remark_times; | |
| 470 NumberSeq _remark_mark_times; | |
| 471 NumberSeq _remark_weak_ref_times; | |
| 472 NumberSeq _cleanup_times; | |
| 473 double _total_counting_time; | |
| 474 double _total_rs_scrub_time; | |
| 475 | |
| 476 double* _accum_task_vtime; // accumulated task vtime | |
| 477 | |
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478 FlexibleWorkGang* _parallel_workers; |
| 342 | 479 |
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480 ForceOverflowSettings _force_overflow_conc; |
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481 ForceOverflowSettings _force_overflow_stw; |
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482 |
| 342 | 483 void weakRefsWork(bool clear_all_soft_refs); |
| 484 | |
| 485 void swapMarkBitMaps(); | |
| 486 | |
| 487 // It resets the global marking data structures, as well as the | |
| 488 // task local ones; should be called during initial mark. | |
| 489 void reset(); | |
| 490 // It resets all the marking data structures. | |
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491 void clear_marking_state(bool clear_overflow = true); |
| 342 | 492 |
| 493 // It should be called to indicate which phase we're in (concurrent | |
| 494 // mark or remark) and how many threads are currently active. | |
| 495 void set_phase(size_t active_tasks, bool concurrent); | |
| 496 // We do this after we're done with marking so that the marking data | |
| 497 // structures are initialised to a sensible and predictable state. | |
| 498 void set_non_marking_state(); | |
| 499 | |
| 500 // prints all gathered CM-related statistics | |
| 501 void print_stats(); | |
| 502 | |
| 2152 | 503 bool cleanup_list_is_empty() { |
| 504 return _cleanup_list.is_empty(); | |
| 505 } | |
| 506 | |
| 342 | 507 // accessor methods |
| 508 size_t parallel_marking_threads() { return _parallel_marking_threads; } | |
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509 size_t max_parallel_marking_threads() { return _max_parallel_marking_threads;} |
| 342 | 510 double sleep_factor() { return _sleep_factor; } |
| 511 double marking_task_overhead() { return _marking_task_overhead;} | |
| 512 double cleanup_sleep_factor() { return _cleanup_sleep_factor; } | |
| 513 double cleanup_task_overhead() { return _cleanup_task_overhead;} | |
| 514 | |
| 515 HeapWord* finger() { return _finger; } | |
| 516 bool concurrent() { return _concurrent; } | |
| 517 size_t active_tasks() { return _active_tasks; } | |
| 518 ParallelTaskTerminator* terminator() { return &_terminator; } | |
| 519 | |
| 520 // It claims the next available region to be scanned by a marking | |
| 521 // task. It might return NULL if the next region is empty or we have | |
| 522 // run out of regions. In the latter case, out_of_regions() | |
| 523 // determines whether we've really run out of regions or the task | |
| 524 // should call claim_region() again. This might seem a bit | |
| 525 // awkward. Originally, the code was written so that claim_region() | |
| 526 // either successfully returned with a non-empty region or there | |
| 527 // were no more regions to be claimed. The problem with this was | |
| 528 // that, in certain circumstances, it iterated over large chunks of | |
| 529 // the heap finding only empty regions and, while it was working, it | |
| 530 // was preventing the calling task to call its regular clock | |
| 531 // method. So, this way, each task will spend very little time in | |
| 532 // claim_region() and is allowed to call the regular clock method | |
| 533 // frequently. | |
| 534 HeapRegion* claim_region(int task); | |
| 535 | |
| 536 // It determines whether we've run out of regions to scan. | |
| 537 bool out_of_regions() { return _finger == _heap_end; } | |
| 538 | |
| 539 // Returns the task with the given id | |
| 540 CMTask* task(int id) { | |
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541 assert(0 <= id && id < (int) _active_tasks, |
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542 "task id not within active bounds"); |
| 342 | 543 return _tasks[id]; |
| 544 } | |
| 545 | |
| 546 // Returns the task queue with the given id | |
| 547 CMTaskQueue* task_queue(int id) { | |
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548 assert(0 <= id && id < (int) _active_tasks, |
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549 "task queue id not within active bounds"); |
| 342 | 550 return (CMTaskQueue*) _task_queues->queue(id); |
| 551 } | |
| 552 | |
| 553 // Returns the task queue set | |
| 554 CMTaskQueueSet* task_queues() { return _task_queues; } | |
| 555 | |
| 556 // Access / manipulation of the overflow flag which is set to | |
| 557 // indicate that the global stack or region stack has overflown | |
| 558 bool has_overflown() { return _has_overflown; } | |
| 559 void set_has_overflown() { _has_overflown = true; } | |
| 560 void clear_has_overflown() { _has_overflown = false; } | |
| 561 | |
| 562 bool has_aborted() { return _has_aborted; } | |
| 563 bool restart_for_overflow() { return _restart_for_overflow; } | |
| 564 | |
| 565 // Methods to enter the two overflow sync barriers | |
| 566 void enter_first_sync_barrier(int task_num); | |
| 567 void enter_second_sync_barrier(int task_num); | |
| 568 | |
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569 ForceOverflowSettings* force_overflow_conc() { |
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570 return &_force_overflow_conc; |
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571 } |
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572 |
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573 ForceOverflowSettings* force_overflow_stw() { |
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574 return &_force_overflow_stw; |
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575 } |
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576 |
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577 ForceOverflowSettings* force_overflow() { |
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578 if (concurrent()) { |
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579 return force_overflow_conc(); |
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580 } else { |
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581 return force_overflow_stw(); |
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582 } |
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583 } |
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584 |
| 342 | 585 public: |
| 586 // Manipulation of the global mark stack. | |
| 587 // Notice that the first mark_stack_push is CAS-based, whereas the | |
| 588 // two below are Mutex-based. This is OK since the first one is only | |
| 589 // called during evacuation pauses and doesn't compete with the | |
| 590 // other two (which are called by the marking tasks during | |
| 591 // concurrent marking or remark). | |
| 592 bool mark_stack_push(oop p) { | |
| 593 _markStack.par_push(p); | |
| 594 if (_markStack.overflow()) { | |
| 595 set_has_overflown(); | |
| 596 return false; | |
| 597 } | |
| 598 return true; | |
| 599 } | |
| 600 bool mark_stack_push(oop* arr, int n) { | |
| 601 _markStack.par_push_arr(arr, n); | |
| 602 if (_markStack.overflow()) { | |
| 603 set_has_overflown(); | |
| 604 return false; | |
| 605 } | |
| 606 return true; | |
| 607 } | |
| 608 void mark_stack_pop(oop* arr, int max, int* n) { | |
| 609 _markStack.par_pop_arr(arr, max, n); | |
| 610 } | |
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611 size_t mark_stack_size() { return _markStack.size(); } |
| 342 | 612 size_t partial_mark_stack_size_target() { return _markStack.maxElems()/3; } |
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613 bool mark_stack_overflow() { return _markStack.overflow(); } |
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614 bool mark_stack_empty() { return _markStack.isEmpty(); } |
| 342 | 615 |
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616 // (Lock-free) Manipulation of the region stack |
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617 bool region_stack_push_lock_free(MemRegion mr) { |
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618 // Currently we only call the lock-free version during evacuation |
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619 // pauses. |
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620 assert(SafepointSynchronize::is_at_safepoint(), "world should be stopped"); |
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621 |
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622 _regionStack.push_lock_free(mr); |
| 342 | 623 if (_regionStack.overflow()) { |
| 624 set_has_overflown(); | |
| 625 return false; | |
| 626 } | |
| 627 return true; | |
| 628 } | |
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629 |
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630 // Lock-free version of region-stack pop. Should only be |
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631 // called in tandem with other lock-free pops. |
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632 MemRegion region_stack_pop_lock_free() { |
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633 return _regionStack.pop_lock_free(); |
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634 } |
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635 |
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636 #if 0 |
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637 // The routines that manipulate the region stack with a lock are |
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638 // not currently used. They should be retained, however, as a |
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639 // diagnostic aid. |
|
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640 |
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641 bool region_stack_push_with_lock(MemRegion mr) { |
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642 // Currently we only call the lock-based version during either |
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643 // concurrent marking or remark. |
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644 assert(!SafepointSynchronize::is_at_safepoint() || !concurrent(), |
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645 "if we are at a safepoint it should be the remark safepoint"); |
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646 |
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647 _regionStack.push_with_lock(mr); |
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648 if (_regionStack.overflow()) { |
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649 set_has_overflown(); |
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650 return false; |
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651 } |
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652 return true; |
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653 } |
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654 |
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655 MemRegion region_stack_pop_with_lock() { |
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656 // Currently we only call the lock-based version during either |
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657 // concurrent marking or remark. |
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658 assert(!SafepointSynchronize::is_at_safepoint() || !concurrent(), |
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659 "if we are at a safepoint it should be the remark safepoint"); |
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660 |
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661 return _regionStack.pop_with_lock(); |
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662 } |
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663 #endif |
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664 |
| 342 | 665 int region_stack_size() { return _regionStack.size(); } |
| 666 bool region_stack_overflow() { return _regionStack.overflow(); } | |
| 667 bool region_stack_empty() { return _regionStack.isEmpty(); } | |
| 668 | |
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669 // Iterate over any regions that were aborted while draining the |
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670 // region stack (any such regions are saved in the corresponding |
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671 // CMTask) and invalidate (i.e. assign to the empty MemRegion()) |
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672 // any regions that point into the collection set. |
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673 bool invalidate_aborted_regions_in_cset(); |
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674 |
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675 // Returns true if there are any aborted memory regions. |
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676 bool has_aborted_regions(); |
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677 |
| 342 | 678 bool concurrent_marking_in_progress() { |
| 679 return _concurrent_marking_in_progress; | |
| 680 } | |
| 681 void set_concurrent_marking_in_progress() { | |
| 682 _concurrent_marking_in_progress = true; | |
| 683 } | |
| 684 void clear_concurrent_marking_in_progress() { | |
| 685 _concurrent_marking_in_progress = false; | |
| 686 } | |
| 687 | |
| 688 void update_accum_task_vtime(int i, double vtime) { | |
| 689 _accum_task_vtime[i] += vtime; | |
| 690 } | |
| 691 | |
| 692 double all_task_accum_vtime() { | |
| 693 double ret = 0.0; | |
| 694 for (int i = 0; i < (int)_max_task_num; ++i) | |
| 695 ret += _accum_task_vtime[i]; | |
| 696 return ret; | |
| 697 } | |
| 698 | |
| 699 // Attempts to steal an object from the task queues of other tasks | |
| 700 bool try_stealing(int task_num, int* hash_seed, oop& obj) { | |
| 701 return _task_queues->steal(task_num, hash_seed, obj); | |
| 702 } | |
| 703 | |
| 704 // It grays an object by first marking it. Then, if it's behind the | |
| 705 // global finger, it also pushes it on the global stack. | |
| 706 void deal_with_reference(oop obj); | |
| 707 | |
| 708 ConcurrentMark(ReservedSpace rs, int max_regions); | |
| 709 ~ConcurrentMark(); | |
| 710 ConcurrentMarkThread* cmThread() { return _cmThread; } | |
| 711 | |
| 712 CMBitMapRO* prevMarkBitMap() const { return _prevMarkBitMap; } | |
| 713 CMBitMap* nextMarkBitMap() const { return _nextMarkBitMap; } | |
| 714 | |
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715 // Returns the number of GC threads to be used in a concurrent |
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716 // phase based on the number of GC threads being used in a STW |
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717 // phase. |
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718 size_t scale_parallel_threads(size_t n_par_threads); |
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719 |
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720 // Calculates the number of GC threads to be used in a concurrent phase. |
| 4711 | 721 size_t calc_parallel_marking_threads(); |
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722 |
| 342 | 723 // The following three are interaction between CM and |
| 724 // G1CollectedHeap | |
| 725 | |
| 726 // This notifies CM that a root during initial-mark needs to be | |
| 727 // grayed and it's MT-safe. Currently, we just mark it. But, in the | |
| 728 // future, we can experiment with pushing it on the stack and we can | |
| 729 // do this without changing G1CollectedHeap. | |
| 730 void grayRoot(oop p); | |
| 731 // It's used during evacuation pauses to gray a region, if | |
| 732 // necessary, and it's MT-safe. It assumes that the caller has | |
| 733 // marked any objects on that region. If _should_gray_objects is | |
| 734 // true and we're still doing concurrent marking, the region is | |
| 735 // pushed on the region stack, if it is located below the global | |
| 736 // finger, otherwise we do nothing. | |
| 737 void grayRegionIfNecessary(MemRegion mr); | |
| 738 // It's used during evacuation pauses to mark and, if necessary, | |
| 739 // gray a single object and it's MT-safe. It assumes the caller did | |
| 740 // not mark the object. If _should_gray_objects is true and we're | |
| 741 // still doing concurrent marking, the objects is pushed on the | |
| 742 // global stack, if it is located below the global finger, otherwise | |
| 743 // we do nothing. | |
| 744 void markAndGrayObjectIfNecessary(oop p); | |
| 745 | |
| 1388 | 746 // It iterates over the heap and for each object it comes across it |
| 747 // will dump the contents of its reference fields, as well as | |
| 748 // liveness information for the object and its referents. The dump | |
| 749 // will be written to a file with the following name: | |
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750 // G1PrintReachableBaseFile + "." + str. |
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751 // vo decides whether the prev (vo == UsePrevMarking), the next |
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752 // (vo == UseNextMarking) marking information, or the mark word |
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753 // (vo == UseMarkWord) will be used to determine the liveness of |
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754 // each object / referent. |
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755 // If all is true, all objects in the heap will be dumped, otherwise |
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756 // only the live ones. In the dump the following symbols / breviations |
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757 // are used: |
| 1388 | 758 // M : an explicitly live object (its bitmap bit is set) |
| 759 // > : an implicitly live object (over tams) | |
| 760 // O : an object outside the G1 heap (typically: in the perm gen) | |
| 761 // NOT : a reference field whose referent is not live | |
| 762 // AND MARKED : indicates that an object is both explicitly and | |
| 763 // implicitly live (it should be one or the other, not both) | |
| 764 void print_reachable(const char* str, | |
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765 VerifyOption vo, bool all) PRODUCT_RETURN; |
| 342 | 766 |
| 767 // Clear the next marking bitmap (will be called concurrently). | |
| 768 void clearNextBitmap(); | |
| 769 | |
| 770 // These two do the work that needs to be done before and after the | |
| 771 // initial root checkpoint. Since this checkpoint can be done at two | |
| 772 // different points (i.e. an explicit pause or piggy-backed on a | |
| 773 // young collection), then it's nice to be able to easily share the | |
| 774 // pre/post code. It might be the case that we can put everything in | |
| 775 // the post method. TP | |
| 776 void checkpointRootsInitialPre(); | |
| 777 void checkpointRootsInitialPost(); | |
| 778 | |
| 779 // Do concurrent phase of marking, to a tentative transitive closure. | |
| 780 void markFromRoots(); | |
| 781 | |
| 782 // Process all unprocessed SATB buffers. It is called at the | |
| 783 // beginning of an evacuation pause. | |
| 784 void drainAllSATBBuffers(); | |
| 785 | |
| 786 void checkpointRootsFinal(bool clear_all_soft_refs); | |
| 787 void checkpointRootsFinalWork(); | |
| 788 void calcDesiredRegions(); | |
| 789 void cleanup(); | |
| 790 void completeCleanup(); | |
| 791 | |
| 792 // Mark in the previous bitmap. NB: this is usually read-only, so use | |
| 793 // this carefully! | |
| 794 void markPrev(oop p); | |
| 795 void clear(oop p); | |
| 796 // Clears marks for all objects in the given range, for both prev and | |
| 797 // next bitmaps. NB: the previous bitmap is usually read-only, so use | |
| 798 // this carefully! | |
| 799 void clearRangeBothMaps(MemRegion mr); | |
| 800 | |
| 801 // Record the current top of the mark and region stacks; a | |
| 802 // subsequent oops_do() on the mark stack and | |
| 803 // invalidate_entries_into_cset() on the region stack will iterate | |
| 804 // only over indices valid at the time of this call. | |
| 805 void set_oops_do_bound() { | |
| 806 _markStack.set_oops_do_bound(); | |
| 807 _regionStack.set_oops_do_bound(); | |
| 808 } | |
| 809 // Iterate over the oops in the mark stack and all local queues. It | |
| 810 // also calls invalidate_entries_into_cset() on the region stack. | |
| 811 void oops_do(OopClosure* f); | |
| 812 // It is called at the end of an evacuation pause during marking so | |
| 813 // that CM is notified of where the new end of the heap is. It | |
| 814 // doesn't do anything if concurrent_marking_in_progress() is false, | |
| 815 // unless the force parameter is true. | |
| 816 void update_g1_committed(bool force = false); | |
| 817 | |
| 818 void complete_marking_in_collection_set(); | |
| 819 | |
| 820 // It indicates that a new collection set is being chosen. | |
| 821 void newCSet(); | |
|
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822 |
| 342 | 823 // It registers a collection set heap region with CM. This is used |
| 824 // to determine whether any heap regions are located above the finger. | |
| 825 void registerCSetRegion(HeapRegion* hr); | |
| 826 | |
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827 // Resets the region fields of any active CMTask whose region fields |
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828 // are in the collection set (i.e. the region currently claimed by |
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829 // the CMTask will be evacuated and may be used, subsequently, as |
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830 // an alloc region). When this happens the region fields in the CMTask |
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831 // are stale and, hence, should be cleared causing the worker thread |
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832 // to claim a new region. |
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833 void reset_active_task_region_fields_in_cset(); |
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834 |
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835 // Registers the maximum region-end associated with a set of |
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836 // regions with CM. Again this is used to determine whether any |
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837 // heap regions are located above the finger. |
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838 void register_collection_set_finger(HeapWord* max_finger) { |
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839 // max_finger is the highest heap region end of the regions currently |
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840 // contained in the collection set. If this value is larger than |
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841 // _min_finger then we need to gray objects. |
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842 // This routine is like registerCSetRegion but for an entire |
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843 // collection of regions. |
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844 if (max_finger > _min_finger) { |
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845 _should_gray_objects = true; |
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846 } |
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847 } |
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848 |
| 342 | 849 // Returns "true" if at least one mark has been completed. |
| 850 bool at_least_one_mark_complete() { return _at_least_one_mark_complete; } | |
| 851 | |
| 852 bool isMarked(oop p) const { | |
| 853 assert(p != NULL && p->is_oop(), "expected an oop"); | |
| 854 HeapWord* addr = (HeapWord*)p; | |
| 855 assert(addr >= _nextMarkBitMap->startWord() || | |
| 856 addr < _nextMarkBitMap->endWord(), "in a region"); | |
| 857 | |
| 858 return _nextMarkBitMap->isMarked(addr); | |
| 859 } | |
| 860 | |
| 861 inline bool not_yet_marked(oop p) const; | |
| 862 | |
| 863 // XXX Debug code | |
| 864 bool containing_card_is_marked(void* p); | |
| 865 bool containing_cards_are_marked(void* start, void* last); | |
| 866 | |
| 867 bool isPrevMarked(oop p) const { | |
| 868 assert(p != NULL && p->is_oop(), "expected an oop"); | |
| 869 HeapWord* addr = (HeapWord*)p; | |
| 870 assert(addr >= _prevMarkBitMap->startWord() || | |
| 871 addr < _prevMarkBitMap->endWord(), "in a region"); | |
| 872 | |
| 873 return _prevMarkBitMap->isMarked(addr); | |
| 874 } | |
| 875 | |
| 876 inline bool do_yield_check(int worker_i = 0); | |
| 877 inline bool should_yield(); | |
| 878 | |
| 879 // Called to abort the marking cycle after a Full GC takes palce. | |
| 880 void abort(); | |
| 881 | |
| 882 // This prints the global/local fingers. It is used for debugging. | |
| 883 NOT_PRODUCT(void print_finger();) | |
| 884 | |
| 885 void print_summary_info(); | |
| 886 | |
| 1019 | 887 void print_worker_threads_on(outputStream* st) const; |
| 888 | |
| 342 | 889 // The following indicate whether a given verbose level has been |
| 890 // set. Notice that anything above stats is conditional to | |
| 891 // _MARKING_VERBOSE_ having been set to 1 | |
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892 bool verbose_stats() { |
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893 return _verbose_level >= stats_verbose; |
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894 } |
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895 bool verbose_low() { |
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896 return _MARKING_VERBOSE_ && _verbose_level >= low_verbose; |
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897 } |
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898 bool verbose_medium() { |
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899 return _MARKING_VERBOSE_ && _verbose_level >= medium_verbose; |
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900 } |
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901 bool verbose_high() { |
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902 return _MARKING_VERBOSE_ && _verbose_level >= high_verbose; |
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903 } |
| 342 | 904 }; |
| 905 | |
| 906 // A class representing a marking task. | |
| 907 class CMTask : public TerminatorTerminator { | |
| 908 private: | |
| 909 enum PrivateConstants { | |
| 910 // the regular clock call is called once the scanned words reaches | |
| 911 // this limit | |
| 912 words_scanned_period = 12*1024, | |
| 913 // the regular clock call is called once the number of visited | |
| 914 // references reaches this limit | |
| 915 refs_reached_period = 384, | |
| 916 // initial value for the hash seed, used in the work stealing code | |
| 917 init_hash_seed = 17, | |
| 918 // how many entries will be transferred between global stack and | |
| 919 // local queues | |
| 920 global_stack_transfer_size = 16 | |
| 921 }; | |
| 922 | |
| 923 int _task_id; | |
| 924 G1CollectedHeap* _g1h; | |
| 925 ConcurrentMark* _cm; | |
| 926 CMBitMap* _nextMarkBitMap; | |
| 927 // the task queue of this task | |
| 928 CMTaskQueue* _task_queue; | |
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929 private: |
| 342 | 930 // the task queue set---needed for stealing |
| 931 CMTaskQueueSet* _task_queues; | |
| 932 // indicates whether the task has been claimed---this is only for | |
| 933 // debugging purposes | |
| 934 bool _claimed; | |
| 935 | |
| 936 // number of calls to this task | |
| 937 int _calls; | |
| 938 | |
| 939 // when the virtual timer reaches this time, the marking step should | |
| 940 // exit | |
| 941 double _time_target_ms; | |
| 942 // the start time of the current marking step | |
| 943 double _start_time_ms; | |
| 944 | |
| 945 // the oop closure used for iterations over oops | |
| 3771 | 946 G1CMOopClosure* _cm_oop_closure; |
| 342 | 947 |
| 948 // the region this task is scanning, NULL if we're not scanning any | |
| 949 HeapRegion* _curr_region; | |
| 950 // the local finger of this task, NULL if we're not scanning a region | |
| 951 HeapWord* _finger; | |
| 952 // limit of the region this task is scanning, NULL if we're not scanning one | |
| 953 HeapWord* _region_limit; | |
| 954 | |
| 955 // This is used only when we scan regions popped from the region | |
| 956 // stack. It records what the last object on such a region we | |
| 957 // scanned was. It is used to ensure that, if we abort region | |
| 958 // iteration, we do not rescan the first part of the region. This | |
| 959 // should be NULL when we're not scanning a region from the region | |
| 960 // stack. | |
| 961 HeapWord* _region_finger; | |
| 962 | |
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963 // If we abort while scanning a region we record the remaining |
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964 // unscanned portion and check this field when marking restarts. |
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965 // This avoids having to push on the region stack while other |
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966 // marking threads may still be popping regions. |
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967 // If we were to push the unscanned portion directly to the |
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968 // region stack then we would need to using locking versions |
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969 // of the push and pop operations. |
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970 MemRegion _aborted_region; |
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971 |
| 342 | 972 // the number of words this task has scanned |
| 973 size_t _words_scanned; | |
| 974 // When _words_scanned reaches this limit, the regular clock is | |
| 975 // called. Notice that this might be decreased under certain | |
| 976 // circumstances (i.e. when we believe that we did an expensive | |
| 977 // operation). | |
| 978 size_t _words_scanned_limit; | |
| 979 // the initial value of _words_scanned_limit (i.e. what it was | |
| 980 // before it was decreased). | |
| 981 size_t _real_words_scanned_limit; | |
| 982 | |
| 983 // the number of references this task has visited | |
| 984 size_t _refs_reached; | |
| 985 // When _refs_reached reaches this limit, the regular clock is | |
| 986 // called. Notice this this might be decreased under certain | |
| 987 // circumstances (i.e. when we believe that we did an expensive | |
| 988 // operation). | |
| 989 size_t _refs_reached_limit; | |
| 990 // the initial value of _refs_reached_limit (i.e. what it was before | |
| 991 // it was decreased). | |
| 992 size_t _real_refs_reached_limit; | |
| 993 | |
| 994 // used by the work stealing stuff | |
| 995 int _hash_seed; | |
| 996 // if this is true, then the task has aborted for some reason | |
| 997 bool _has_aborted; | |
| 998 // set when the task aborts because it has met its time quota | |
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999 bool _has_timed_out; |
| 342 | 1000 // true when we're draining SATB buffers; this avoids the task |
| 1001 // aborting due to SATB buffers being available (as we're already | |
| 1002 // dealing with them) | |
| 1003 bool _draining_satb_buffers; | |
| 1004 | |
| 1005 // number sequence of past step times | |
| 1006 NumberSeq _step_times_ms; | |
| 1007 // elapsed time of this task | |
| 1008 double _elapsed_time_ms; | |
| 1009 // termination time of this task | |
| 1010 double _termination_time_ms; | |
| 1011 // when this task got into the termination protocol | |
| 1012 double _termination_start_time_ms; | |
| 1013 | |
| 1014 // true when the task is during a concurrent phase, false when it is | |
| 1015 // in the remark phase (so, in the latter case, we do not have to | |
| 1016 // check all the things that we have to check during the concurrent | |
| 1017 // phase, i.e. SATB buffer availability...) | |
| 1018 bool _concurrent; | |
| 1019 | |
| 1020 TruncatedSeq _marking_step_diffs_ms; | |
| 1021 | |
| 1022 // LOTS of statistics related with this task | |
| 1023 #if _MARKING_STATS_ | |
| 1024 NumberSeq _all_clock_intervals_ms; | |
| 1025 double _interval_start_time_ms; | |
| 1026 | |
| 1027 int _aborted; | |
| 1028 int _aborted_overflow; | |
| 1029 int _aborted_cm_aborted; | |
| 1030 int _aborted_yield; | |
| 1031 int _aborted_timed_out; | |
| 1032 int _aborted_satb; | |
| 1033 int _aborted_termination; | |
| 1034 | |
| 1035 int _steal_attempts; | |
| 1036 int _steals; | |
| 1037 | |
| 1038 int _clock_due_to_marking; | |
| 1039 int _clock_due_to_scanning; | |
| 1040 | |
| 1041 int _local_pushes; | |
| 1042 int _local_pops; | |
| 1043 int _local_max_size; | |
| 1044 int _objs_scanned; | |
| 1045 | |
| 1046 int _global_pushes; | |
| 1047 int _global_pops; | |
| 1048 int _global_max_size; | |
| 1049 | |
| 1050 int _global_transfers_to; | |
| 1051 int _global_transfers_from; | |
| 1052 | |
| 1053 int _region_stack_pops; | |
| 1054 | |
| 1055 int _regions_claimed; | |
| 1056 int _objs_found_on_bitmap; | |
| 1057 | |
| 1058 int _satb_buffers_processed; | |
| 1059 #endif // _MARKING_STATS_ | |
| 1060 | |
| 1061 // it updates the local fields after this task has claimed | |
| 1062 // a new region to scan | |
| 1063 void setup_for_region(HeapRegion* hr); | |
| 1064 // it brings up-to-date the limit of the region | |
| 1065 void update_region_limit(); | |
| 1066 | |
| 1067 // called when either the words scanned or the refs visited limit | |
| 1068 // has been reached | |
| 1069 void reached_limit(); | |
| 1070 // recalculates the words scanned and refs visited limits | |
| 1071 void recalculate_limits(); | |
| 1072 // decreases the words scanned and refs visited limits when we reach | |
| 1073 // an expensive operation | |
| 1074 void decrease_limits(); | |
| 1075 // it checks whether the words scanned or refs visited reached their | |
| 1076 // respective limit and calls reached_limit() if they have | |
| 1077 void check_limits() { | |
| 1078 if (_words_scanned >= _words_scanned_limit || | |
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1079 _refs_reached >= _refs_reached_limit) { |
| 342 | 1080 reached_limit(); |
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1081 } |
| 342 | 1082 } |
| 1083 // this is supposed to be called regularly during a marking step as | |
| 1084 // it checks a bunch of conditions that might cause the marking step | |
| 1085 // to abort | |
| 1086 void regular_clock_call(); | |
| 1087 bool concurrent() { return _concurrent; } | |
| 1088 | |
| 1089 public: | |
| 1090 // It resets the task; it should be called right at the beginning of | |
| 1091 // a marking phase. | |
| 1092 void reset(CMBitMap* _nextMarkBitMap); | |
| 1093 // it clears all the fields that correspond to a claimed region. | |
| 1094 void clear_region_fields(); | |
| 1095 | |
| 1096 void set_concurrent(bool concurrent) { _concurrent = concurrent; } | |
| 1097 | |
| 1098 // The main method of this class which performs a marking step | |
| 1099 // trying not to exceed the given duration. However, it might exit | |
| 1100 // prematurely, according to some conditions (i.e. SATB buffers are | |
| 1101 // available for processing). | |
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1102 void do_marking_step(double target_ms, bool do_stealing, bool do_termination); |
| 342 | 1103 |
| 1104 // These two calls start and stop the timer | |
| 1105 void record_start_time() { | |
| 1106 _elapsed_time_ms = os::elapsedTime() * 1000.0; | |
| 1107 } | |
| 1108 void record_end_time() { | |
| 1109 _elapsed_time_ms = os::elapsedTime() * 1000.0 - _elapsed_time_ms; | |
| 1110 } | |
| 1111 | |
| 1112 // returns the task ID | |
| 1113 int task_id() { return _task_id; } | |
| 1114 | |
| 1115 // From TerminatorTerminator. It determines whether this task should | |
| 1116 // exit the termination protocol after it's entered it. | |
| 1117 virtual bool should_exit_termination(); | |
| 1118 | |
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1119 // Resets the local region fields after a task has finished scanning a |
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1120 // region; or when they have become stale as a result of the region |
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1121 // being evacuated. |
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1122 void giveup_current_region(); |
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1123 |
| 342 | 1124 HeapWord* finger() { return _finger; } |
| 1125 | |
| 1126 bool has_aborted() { return _has_aborted; } | |
| 1127 void set_has_aborted() { _has_aborted = true; } | |
| 1128 void clear_has_aborted() { _has_aborted = false; } | |
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1129 bool has_timed_out() { return _has_timed_out; } |
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1130 bool claimed() { return _claimed; } |
| 342 | 1131 |
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1132 // Support routines for the partially scanned region that may be |
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1133 // recorded as a result of aborting while draining the CMRegionStack |
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1134 MemRegion aborted_region() { return _aborted_region; } |
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1135 void set_aborted_region(MemRegion mr) |
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1136 { _aborted_region = mr; } |
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1137 |
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1138 // Clears any recorded partially scanned region |
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1139 void clear_aborted_region() { set_aborted_region(MemRegion()); } |
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1140 |
| 3771 | 1141 void set_cm_oop_closure(G1CMOopClosure* cm_oop_closure); |
| 342 | 1142 |
| 1143 // It grays the object by marking it and, if necessary, pushing it | |
| 1144 // on the local queue | |
| 3771 | 1145 inline void deal_with_reference(oop obj); |
| 342 | 1146 |
| 1147 // It scans an object and visits its children. | |
| 3771 | 1148 void scan_object(oop obj); |
| 342 | 1149 |
| 1150 // It pushes an object on the local queue. | |
| 3771 | 1151 inline void push(oop obj); |
| 342 | 1152 |
| 1153 // These two move entries to/from the global stack. | |
| 1154 void move_entries_to_global_stack(); | |
| 1155 void get_entries_from_global_stack(); | |
| 1156 | |
| 1157 // It pops and scans objects from the local queue. If partially is | |
| 1158 // true, then it stops when the queue size is of a given limit. If | |
| 1159 // partially is false, then it stops when the queue is empty. | |
| 1160 void drain_local_queue(bool partially); | |
| 1161 // It moves entries from the global stack to the local queue and | |
| 1162 // drains the local queue. If partially is true, then it stops when | |
| 1163 // both the global stack and the local queue reach a given size. If | |
| 1164 // partially if false, it tries to empty them totally. | |
| 1165 void drain_global_stack(bool partially); | |
| 1166 // It keeps picking SATB buffers and processing them until no SATB | |
| 1167 // buffers are available. | |
| 1168 void drain_satb_buffers(); | |
| 1169 // It keeps popping regions from the region stack and processing | |
| 1170 // them until the region stack is empty. | |
| 1171 void drain_region_stack(BitMapClosure* closure); | |
| 1172 | |
| 1173 // moves the local finger to a new location | |
| 1174 inline void move_finger_to(HeapWord* new_finger) { | |
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1175 assert(new_finger >= _finger && new_finger < _region_limit, "invariant"); |
| 342 | 1176 _finger = new_finger; |
| 1177 } | |
| 1178 | |
| 1179 // moves the region finger to a new location | |
| 1180 inline void move_region_finger_to(HeapWord* new_finger) { | |
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1181 assert(new_finger < _cm->finger(), "invariant"); |
| 342 | 1182 _region_finger = new_finger; |
| 1183 } | |
| 1184 | |
| 1185 CMTask(int task_num, ConcurrentMark *cm, | |
| 1186 CMTaskQueue* task_queue, CMTaskQueueSet* task_queues); | |
| 1187 | |
| 1188 // it prints statistics associated with this task | |
| 1189 void print_stats(); | |
| 1190 | |
| 1191 #if _MARKING_STATS_ | |
| 1192 void increase_objs_found_on_bitmap() { ++_objs_found_on_bitmap; } | |
| 1193 #endif // _MARKING_STATS_ | |
| 1194 }; | |
| 1972 | 1195 |
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1196 // Class that's used to to print out per-region liveness |
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1197 // information. It's currently used at the end of marking and also |
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1198 // after we sort the old regions at the end of the cleanup operation. |
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1199 class G1PrintRegionLivenessInfoClosure: public HeapRegionClosure { |
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1200 private: |
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1201 outputStream* _out; |
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1202 |
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1203 // Accumulators for these values. |
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1204 size_t _total_used_bytes; |
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1205 size_t _total_capacity_bytes; |
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1206 size_t _total_prev_live_bytes; |
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1207 size_t _total_next_live_bytes; |
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1208 |
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1209 // These are set up when we come across a "stars humongous" region |
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1210 // (as this is where most of this information is stored, not in the |
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1211 // subsequent "continues humongous" regions). After that, for every |
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1212 // region in a given humongous region series we deduce the right |
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1213 // values for it by simply subtracting the appropriate amount from |
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1214 // these fields. All these values should reach 0 after we've visited |
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1215 // the last region in the series. |
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1216 size_t _hum_used_bytes; |
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1217 size_t _hum_capacity_bytes; |
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1218 size_t _hum_prev_live_bytes; |
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1219 size_t _hum_next_live_bytes; |
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1220 |
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1221 static double perc(size_t val, size_t total) { |
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1222 if (total == 0) { |
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1223 return 0.0; |
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1224 } else { |
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1225 return 100.0 * ((double) val / (double) total); |
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1226 } |
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1227 } |
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1228 |
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1229 static double bytes_to_mb(size_t val) { |
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1230 return (double) val / (double) M; |
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1231 } |
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1232 |
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1233 // See the .cpp file. |
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1234 size_t get_hum_bytes(size_t* hum_bytes); |
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1235 void get_hum_bytes(size_t* used_bytes, size_t* capacity_bytes, |
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1236 size_t* prev_live_bytes, size_t* next_live_bytes); |
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1237 |
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1238 public: |
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1239 // The header and footer are printed in the constructor and |
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1240 // destructor respectively. |
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1241 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name); |
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1242 virtual bool doHeapRegion(HeapRegion* r); |
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1243 ~G1PrintRegionLivenessInfoClosure(); |
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1244 }; |
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1245 |
| 1972 | 1246 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP |