Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.hpp @ 4836:d30fa85f9994
6484965: G1: piggy-back liveness accounting phase on marking
Summary: Remove the separate counting phase of concurrent marking by tracking the amount of marked bytes and the cards spanned by marked objects in marking task/worker thread local data structures, which are updated as individual objects are marked.
Reviewed-by: brutisso, tonyp
| author | johnc |
|---|---|
| date | Thu, 12 Jan 2012 00:06:47 -0800 |
| parents | 851b58c26def |
| children | eff609af17d7 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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 | |
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87 inline bool iterate(BitMapClosure* cl, MemRegion mr); |
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88 inline bool iterate(BitMapClosure* cl); |
| 342 | 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; |
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169 oop* _base; // bottom of stack |
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170 jint _index; // one more than last occupied index |
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171 jint _capacity; // max #elements |
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172 jint _saved_index; // value of _index saved at start of GC |
| 342 | 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 | |
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250 // Record the current index. |
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251 void note_start_of_gc(); |
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252 |
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253 // Make sure that we have not added any entries to the stack during GC. |
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254 void note_end_of_gc(); |
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255 |
| 342 | 256 // iterate over the oops in the mark stack, up to the bound recorded via |
| 257 // the call above. | |
| 258 void oops_do(OopClosure* f); | |
| 259 }; | |
| 260 | |
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261 class CMRegionStack VALUE_OBJ_CLASS_SPEC { |
| 342 | 262 MemRegion* _base; |
| 263 jint _capacity; | |
| 264 jint _index; | |
| 265 jint _oops_do_bound; | |
| 266 bool _overflow; | |
| 267 public: | |
| 268 CMRegionStack(); | |
| 269 ~CMRegionStack(); | |
| 270 void allocate(size_t size); | |
| 271 | |
| 272 // This is lock-free; assumes that it will only be called in parallel | |
| 273 // with other "push" operations (no pops). | |
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274 void push_lock_free(MemRegion mr); |
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275 |
| 342 | 276 // Lock-free; assumes that it will only be called in parallel |
| 277 // with other "pop" operations (no pushes). | |
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278 MemRegion pop_lock_free(); |
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279 |
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280 #if 0 |
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281 // The routines that manipulate the region stack with a lock are |
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282 // not currently used. They should be retained, however, as a |
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283 // diagnostic aid. |
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284 |
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285 // These two are the implementations that use a lock. They can be |
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286 // called concurrently with each other but they should not be called |
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287 // concurrently with the lock-free versions (push() / pop()). |
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288 void push_with_lock(MemRegion mr); |
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289 MemRegion pop_with_lock(); |
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290 #endif |
| 342 | 291 |
| 292 bool isEmpty() { return _index == 0; } | |
| 293 bool isFull() { return _index == _capacity; } | |
| 294 | |
| 295 bool overflow() { return _overflow; } | |
| 296 void clear_overflow() { _overflow = false; } | |
| 297 | |
| 298 int size() { return _index; } | |
| 299 | |
| 300 // It iterates over the entries in the region stack and it | |
| 301 // invalidates (i.e. assigns MemRegion()) the ones that point to | |
| 302 // regions in the collection set. | |
| 303 bool invalidate_entries_into_cset(); | |
| 304 | |
| 305 // This gives an upper bound up to which the iteration in | |
| 306 // invalidate_entries_into_cset() will reach. This prevents | |
| 307 // newly-added entries to be unnecessarily scanned. | |
| 308 void set_oops_do_bound() { | |
| 309 _oops_do_bound = _index; | |
| 310 } | |
| 311 | |
| 312 void setEmpty() { _index = 0; clear_overflow(); } | |
| 313 }; | |
| 314 | |
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315 class ForceOverflowSettings VALUE_OBJ_CLASS_SPEC { |
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316 private: |
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317 #ifndef PRODUCT |
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318 uintx _num_remaining; |
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319 bool _force; |
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320 #endif // !defined(PRODUCT) |
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321 |
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322 public: |
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323 void init() PRODUCT_RETURN; |
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324 void update() PRODUCT_RETURN; |
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325 bool should_force() PRODUCT_RETURN_( return false; ); |
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326 }; |
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327 |
| 342 | 328 // this will enable a variety of different statistics per GC task |
| 329 #define _MARKING_STATS_ 0 | |
| 330 // this will enable the higher verbose levels | |
| 331 #define _MARKING_VERBOSE_ 0 | |
| 332 | |
| 333 #if _MARKING_STATS_ | |
| 334 #define statsOnly(statement) \ | |
| 335 do { \ | |
| 336 statement ; \ | |
| 337 } while (0) | |
| 338 #else // _MARKING_STATS_ | |
| 339 #define statsOnly(statement) \ | |
| 340 do { \ | |
| 341 } while (0) | |
| 342 #endif // _MARKING_STATS_ | |
| 343 | |
| 344 typedef enum { | |
| 345 no_verbose = 0, // verbose turned off | |
| 346 stats_verbose, // only prints stats at the end of marking | |
| 347 low_verbose, // low verbose, mostly per region and per major event | |
| 348 medium_verbose, // a bit more detailed than low | |
| 349 high_verbose // per object verbose | |
| 350 } CMVerboseLevel; | |
| 351 | |
| 352 | |
| 353 class ConcurrentMarkThread; | |
| 354 | |
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355 class ConcurrentMark: public CHeapObj { |
| 342 | 356 friend class ConcurrentMarkThread; |
| 357 friend class CMTask; | |
| 358 friend class CMBitMapClosure; | |
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359 friend class CSetMarkOopClosure; |
| 342 | 360 friend class CMGlobalObjectClosure; |
| 361 friend class CMRemarkTask; | |
| 362 friend class CMConcurrentMarkingTask; | |
| 363 friend class G1ParNoteEndTask; | |
| 364 friend class CalcLiveObjectsClosure; | |
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365 friend class G1CMRefProcTaskProxy; |
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366 friend class G1CMRefProcTaskExecutor; |
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367 friend class G1CMParKeepAliveAndDrainClosure; |
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368 friend class G1CMParDrainMarkingStackClosure; |
| 342 | 369 |
| 370 protected: | |
| 371 ConcurrentMarkThread* _cmThread; // the thread doing the work | |
| 372 G1CollectedHeap* _g1h; // the heap. | |
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373 uint _parallel_marking_threads; // the number of marking |
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374 // threads we're use |
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375 uint _max_parallel_marking_threads; // max number of marking |
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376 // threads we'll ever use |
| 342 | 377 double _sleep_factor; // how much we have to sleep, with |
| 378 // respect to the work we just did, to | |
| 379 // meet the marking overhead goal | |
| 380 double _marking_task_overhead; // marking target overhead for | |
| 381 // a single task | |
| 382 | |
| 383 // same as the two above, but for the cleanup task | |
| 384 double _cleanup_sleep_factor; | |
| 385 double _cleanup_task_overhead; | |
| 386 | |
| 2152 | 387 FreeRegionList _cleanup_list; |
| 342 | 388 |
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389 // Concurrent marking support structures |
| 342 | 390 CMBitMap _markBitMap1; |
| 391 CMBitMap _markBitMap2; | |
| 392 CMBitMapRO* _prevMarkBitMap; // completed mark bitmap | |
| 393 CMBitMap* _nextMarkBitMap; // under-construction mark bitmap | |
| 394 bool _at_least_one_mark_complete; | |
| 395 | |
| 396 BitMap _region_bm; | |
| 397 BitMap _card_bm; | |
| 398 | |
| 399 // Heap bounds | |
| 400 HeapWord* _heap_start; | |
| 401 HeapWord* _heap_end; | |
| 402 | |
| 403 // For gray objects | |
| 404 CMMarkStack _markStack; // Grey objects behind global finger. | |
| 405 CMRegionStack _regionStack; // Grey regions behind global finger. | |
| 406 HeapWord* volatile _finger; // the global finger, region aligned, | |
| 407 // always points to the end of the | |
| 408 // last claimed region | |
| 409 | |
| 410 // marking tasks | |
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411 uint _max_task_num; // maximum task number |
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412 uint _active_tasks; // task num currently active |
| 342 | 413 CMTask** _tasks; // task queue array (max_task_num len) |
| 414 CMTaskQueueSet* _task_queues; // task queue set | |
| 415 ParallelTaskTerminator _terminator; // for termination | |
| 416 | |
| 417 // Two sync barriers that are used to synchronise tasks when an | |
| 418 // overflow occurs. The algorithm is the following. All tasks enter | |
| 419 // the first one to ensure that they have all stopped manipulating | |
| 420 // the global data structures. After they exit it, they re-initialise | |
| 421 // their data structures and task 0 re-initialises the global data | |
| 422 // structures. Then, they enter the second sync barrier. This | |
| 423 // ensure, that no task starts doing work before all data | |
| 424 // structures (local and global) have been re-initialised. When they | |
| 425 // exit it, they are free to start working again. | |
| 426 WorkGangBarrierSync _first_overflow_barrier_sync; | |
| 427 WorkGangBarrierSync _second_overflow_barrier_sync; | |
| 428 | |
| 429 // this is set by any task, when an overflow on the global data | |
| 430 // structures is detected. | |
| 431 volatile bool _has_overflown; | |
| 432 // true: marking is concurrent, false: we're in remark | |
| 433 volatile bool _concurrent; | |
| 434 // set at the end of a Full GC so that marking aborts | |
| 435 volatile bool _has_aborted; | |
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436 |
| 342 | 437 // used when remark aborts due to an overflow to indicate that |
| 438 // another concurrent marking phase should start | |
| 439 volatile bool _restart_for_overflow; | |
| 440 | |
| 441 // This is true from the very start of concurrent marking until the | |
| 442 // point when all the tasks complete their work. It is really used | |
| 443 // to determine the points between the end of concurrent marking and | |
| 444 // time of remark. | |
| 445 volatile bool _concurrent_marking_in_progress; | |
| 446 | |
| 447 // verbose level | |
| 448 CMVerboseLevel _verbose_level; | |
| 449 | |
| 450 // These two fields are used to implement the optimisation that | |
| 451 // avoids pushing objects on the global/region stack if there are | |
| 452 // no collection set regions above the lowest finger. | |
| 453 | |
| 454 // This is the lowest finger (among the global and local fingers), | |
| 455 // which is calculated before a new collection set is chosen. | |
| 456 HeapWord* _min_finger; | |
| 457 // If this flag is true, objects/regions that are marked below the | |
| 458 // finger should be pushed on the stack(s). If this is flag is | |
| 459 // false, it is safe not to push them on the stack(s). | |
| 460 bool _should_gray_objects; | |
| 461 | |
| 462 // All of these times are in ms. | |
| 463 NumberSeq _init_times; | |
| 464 NumberSeq _remark_times; | |
| 465 NumberSeq _remark_mark_times; | |
| 466 NumberSeq _remark_weak_ref_times; | |
| 467 NumberSeq _cleanup_times; | |
| 468 double _total_counting_time; | |
| 469 double _total_rs_scrub_time; | |
| 470 | |
| 471 double* _accum_task_vtime; // accumulated task vtime | |
| 472 | |
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473 FlexibleWorkGang* _parallel_workers; |
| 342 | 474 |
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475 ForceOverflowSettings _force_overflow_conc; |
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476 ForceOverflowSettings _force_overflow_stw; |
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477 |
| 342 | 478 void weakRefsWork(bool clear_all_soft_refs); |
| 479 | |
| 480 void swapMarkBitMaps(); | |
| 481 | |
| 482 // It resets the global marking data structures, as well as the | |
| 483 // task local ones; should be called during initial mark. | |
| 484 void reset(); | |
| 485 // It resets all the marking data structures. | |
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486 void clear_marking_state(bool clear_overflow = true); |
| 342 | 487 |
| 488 // It should be called to indicate which phase we're in (concurrent | |
| 489 // mark or remark) and how many threads are currently active. | |
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490 void set_phase(uint active_tasks, bool concurrent); |
| 342 | 491 // We do this after we're done with marking so that the marking data |
| 492 // structures are initialised to a sensible and predictable state. | |
| 493 void set_non_marking_state(); | |
| 494 | |
| 495 // prints all gathered CM-related statistics | |
| 496 void print_stats(); | |
| 497 | |
| 2152 | 498 bool cleanup_list_is_empty() { |
| 499 return _cleanup_list.is_empty(); | |
| 500 } | |
| 501 | |
| 342 | 502 // accessor methods |
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503 uint parallel_marking_threads() { return _parallel_marking_threads; } |
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504 uint max_parallel_marking_threads() { return _max_parallel_marking_threads;} |
| 342 | 505 double sleep_factor() { return _sleep_factor; } |
| 506 double marking_task_overhead() { return _marking_task_overhead;} | |
| 507 double cleanup_sleep_factor() { return _cleanup_sleep_factor; } | |
| 508 double cleanup_task_overhead() { return _cleanup_task_overhead;} | |
| 509 | |
| 510 HeapWord* finger() { return _finger; } | |
| 511 bool concurrent() { return _concurrent; } | |
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512 uint active_tasks() { return _active_tasks; } |
| 342 | 513 ParallelTaskTerminator* terminator() { return &_terminator; } |
| 514 | |
| 515 // It claims the next available region to be scanned by a marking | |
| 516 // task. It might return NULL if the next region is empty or we have | |
| 517 // run out of regions. In the latter case, out_of_regions() | |
| 518 // determines whether we've really run out of regions or the task | |
| 519 // should call claim_region() again. This might seem a bit | |
| 520 // awkward. Originally, the code was written so that claim_region() | |
| 521 // either successfully returned with a non-empty region or there | |
| 522 // were no more regions to be claimed. The problem with this was | |
| 523 // that, in certain circumstances, it iterated over large chunks of | |
| 524 // the heap finding only empty regions and, while it was working, it | |
| 525 // was preventing the calling task to call its regular clock | |
| 526 // method. So, this way, each task will spend very little time in | |
| 527 // claim_region() and is allowed to call the regular clock method | |
| 528 // frequently. | |
| 529 HeapRegion* claim_region(int task); | |
| 530 | |
| 531 // It determines whether we've run out of regions to scan. | |
| 532 bool out_of_regions() { return _finger == _heap_end; } | |
| 533 | |
| 534 // Returns the task with the given id | |
| 535 CMTask* task(int id) { | |
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536 assert(0 <= id && id < (int) _active_tasks, |
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537 "task id not within active bounds"); |
| 342 | 538 return _tasks[id]; |
| 539 } | |
| 540 | |
| 541 // Returns the task queue with the given id | |
| 542 CMTaskQueue* task_queue(int id) { | |
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543 assert(0 <= id && id < (int) _active_tasks, |
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544 "task queue id not within active bounds"); |
| 342 | 545 return (CMTaskQueue*) _task_queues->queue(id); |
| 546 } | |
| 547 | |
| 548 // Returns the task queue set | |
| 549 CMTaskQueueSet* task_queues() { return _task_queues; } | |
| 550 | |
| 551 // Access / manipulation of the overflow flag which is set to | |
| 552 // indicate that the global stack or region stack has overflown | |
| 553 bool has_overflown() { return _has_overflown; } | |
| 554 void set_has_overflown() { _has_overflown = true; } | |
| 555 void clear_has_overflown() { _has_overflown = false; } | |
| 556 | |
| 557 bool has_aborted() { return _has_aborted; } | |
| 558 bool restart_for_overflow() { return _restart_for_overflow; } | |
| 559 | |
| 560 // Methods to enter the two overflow sync barriers | |
| 561 void enter_first_sync_barrier(int task_num); | |
| 562 void enter_second_sync_barrier(int task_num); | |
| 563 | |
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564 ForceOverflowSettings* force_overflow_conc() { |
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565 return &_force_overflow_conc; |
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566 } |
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567 |
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568 ForceOverflowSettings* force_overflow_stw() { |
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569 return &_force_overflow_stw; |
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570 } |
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571 |
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572 ForceOverflowSettings* force_overflow() { |
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573 if (concurrent()) { |
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574 return force_overflow_conc(); |
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575 } else { |
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576 return force_overflow_stw(); |
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577 } |
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578 } |
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579 |
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580 // Live Data Counting data structures... |
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581 // These data structures are initialized at the start of |
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582 // marking. They are written to while marking is active. |
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583 // They are aggregated during remark; the aggregated values |
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584 // are then used to populate the _region_bm, _card_bm, and |
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585 // the total live bytes, which are then subsequently updated |
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586 // during cleanup. |
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587 |
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588 // An array of bitmaps (one bit map per task). Each bitmap |
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589 // is used to record the cards spanned by the live objects |
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590 // marked by that task/worker. |
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591 BitMap* _count_card_bitmaps; |
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592 |
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593 // Used to record the number of marked live bytes |
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594 // (for each region, by worker thread). |
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595 size_t** _count_marked_bytes; |
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596 |
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597 // Card index of the bottom of the G1 heap. Used for biasing indices into |
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598 // the card bitmaps. |
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599 intptr_t _heap_bottom_card_num; |
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600 |
| 342 | 601 public: |
| 602 // Manipulation of the global mark stack. | |
| 603 // Notice that the first mark_stack_push is CAS-based, whereas the | |
| 604 // two below are Mutex-based. This is OK since the first one is only | |
| 605 // called during evacuation pauses and doesn't compete with the | |
| 606 // other two (which are called by the marking tasks during | |
| 607 // concurrent marking or remark). | |
| 608 bool mark_stack_push(oop p) { | |
| 609 _markStack.par_push(p); | |
| 610 if (_markStack.overflow()) { | |
| 611 set_has_overflown(); | |
| 612 return false; | |
| 613 } | |
| 614 return true; | |
| 615 } | |
| 616 bool mark_stack_push(oop* arr, int n) { | |
| 617 _markStack.par_push_arr(arr, n); | |
| 618 if (_markStack.overflow()) { | |
| 619 set_has_overflown(); | |
| 620 return false; | |
| 621 } | |
| 622 return true; | |
| 623 } | |
| 624 void mark_stack_pop(oop* arr, int max, int* n) { | |
| 625 _markStack.par_pop_arr(arr, max, n); | |
| 626 } | |
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627 size_t mark_stack_size() { return _markStack.size(); } |
| 342 | 628 size_t partial_mark_stack_size_target() { return _markStack.maxElems()/3; } |
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629 bool mark_stack_overflow() { return _markStack.overflow(); } |
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630 bool mark_stack_empty() { return _markStack.isEmpty(); } |
| 342 | 631 |
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632 // (Lock-free) Manipulation of the region stack |
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633 bool region_stack_push_lock_free(MemRegion mr) { |
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634 // Currently we only call the lock-free version during evacuation |
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635 // pauses. |
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636 assert(SafepointSynchronize::is_at_safepoint(), "world should be stopped"); |
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637 |
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638 _regionStack.push_lock_free(mr); |
| 342 | 639 if (_regionStack.overflow()) { |
| 640 set_has_overflown(); | |
| 641 return false; | |
| 642 } | |
| 643 return true; | |
| 644 } | |
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645 |
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646 // Lock-free version of region-stack pop. Should only be |
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647 // called in tandem with other lock-free pops. |
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648 MemRegion region_stack_pop_lock_free() { |
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649 return _regionStack.pop_lock_free(); |
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650 } |
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651 |
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652 #if 0 |
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653 // The routines that manipulate the region stack with a lock are |
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654 // not currently used. They should be retained, however, as a |
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655 // diagnostic aid. |
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656 |
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657 bool region_stack_push_with_lock(MemRegion mr) { |
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658 // Currently we only call the lock-based version during either |
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659 // concurrent marking or remark. |
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660 assert(!SafepointSynchronize::is_at_safepoint() || !concurrent(), |
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661 "if we are at a safepoint it should be the remark safepoint"); |
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662 |
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663 _regionStack.push_with_lock(mr); |
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664 if (_regionStack.overflow()) { |
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665 set_has_overflown(); |
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666 return false; |
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667 } |
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668 return true; |
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669 } |
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670 |
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671 MemRegion region_stack_pop_with_lock() { |
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672 // Currently we only call the lock-based version during either |
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673 // concurrent marking or remark. |
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674 assert(!SafepointSynchronize::is_at_safepoint() || !concurrent(), |
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675 "if we are at a safepoint it should be the remark safepoint"); |
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676 |
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677 return _regionStack.pop_with_lock(); |
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678 } |
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679 #endif |
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680 |
| 342 | 681 int region_stack_size() { return _regionStack.size(); } |
| 682 bool region_stack_overflow() { return _regionStack.overflow(); } | |
| 683 bool region_stack_empty() { return _regionStack.isEmpty(); } | |
| 684 | |
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685 // Iterate over any regions that were aborted while draining the |
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686 // region stack (any such regions are saved in the corresponding |
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687 // CMTask) and invalidate (i.e. assign to the empty MemRegion()) |
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688 // any regions that point into the collection set. |
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689 bool invalidate_aborted_regions_in_cset(); |
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690 |
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691 // Returns true if there are any aborted memory regions. |
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692 bool has_aborted_regions(); |
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693 |
| 342 | 694 bool concurrent_marking_in_progress() { |
| 695 return _concurrent_marking_in_progress; | |
| 696 } | |
| 697 void set_concurrent_marking_in_progress() { | |
| 698 _concurrent_marking_in_progress = true; | |
| 699 } | |
| 700 void clear_concurrent_marking_in_progress() { | |
| 701 _concurrent_marking_in_progress = false; | |
| 702 } | |
| 703 | |
| 704 void update_accum_task_vtime(int i, double vtime) { | |
| 705 _accum_task_vtime[i] += vtime; | |
| 706 } | |
| 707 | |
| 708 double all_task_accum_vtime() { | |
| 709 double ret = 0.0; | |
| 710 for (int i = 0; i < (int)_max_task_num; ++i) | |
| 711 ret += _accum_task_vtime[i]; | |
| 712 return ret; | |
| 713 } | |
| 714 | |
| 715 // Attempts to steal an object from the task queues of other tasks | |
| 716 bool try_stealing(int task_num, int* hash_seed, oop& obj) { | |
| 717 return _task_queues->steal(task_num, hash_seed, obj); | |
| 718 } | |
| 719 | |
| 720 // It grays an object by first marking it. Then, if it's behind the | |
| 721 // global finger, it also pushes it on the global stack. | |
| 722 void deal_with_reference(oop obj); | |
| 723 | |
| 724 ConcurrentMark(ReservedSpace rs, int max_regions); | |
| 725 ~ConcurrentMark(); | |
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726 |
| 342 | 727 ConcurrentMarkThread* cmThread() { return _cmThread; } |
| 728 | |
| 729 CMBitMapRO* prevMarkBitMap() const { return _prevMarkBitMap; } | |
| 730 CMBitMap* nextMarkBitMap() const { return _nextMarkBitMap; } | |
| 731 | |
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732 // Returns the number of GC threads to be used in a concurrent |
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733 // phase based on the number of GC threads being used in a STW |
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734 // phase. |
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735 uint scale_parallel_threads(uint n_par_threads); |
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736 |
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737 // Calculates the number of GC threads to be used in a concurrent phase. |
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738 uint calc_parallel_marking_threads(); |
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739 |
| 342 | 740 // The following three are interaction between CM and |
| 741 // G1CollectedHeap | |
| 742 | |
| 743 // This notifies CM that a root during initial-mark needs to be | |
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744 // grayed. It is MT-safe. |
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745 inline void grayRoot(oop obj, size_t word_size, uint worker_id); |
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746 |
| 342 | 747 // It's used during evacuation pauses to gray a region, if |
| 748 // necessary, and it's MT-safe. It assumes that the caller has | |
| 749 // marked any objects on that region. If _should_gray_objects is | |
| 750 // true and we're still doing concurrent marking, the region is | |
| 751 // pushed on the region stack, if it is located below the global | |
| 752 // finger, otherwise we do nothing. | |
| 753 void grayRegionIfNecessary(MemRegion mr); | |
|
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754 |
| 342 | 755 // It's used during evacuation pauses to mark and, if necessary, |
| 756 // gray a single object and it's MT-safe. It assumes the caller did | |
| 757 // not mark the object. If _should_gray_objects is true and we're | |
| 758 // still doing concurrent marking, the objects is pushed on the | |
| 759 // global stack, if it is located below the global finger, otherwise | |
| 760 // we do nothing. | |
| 761 void markAndGrayObjectIfNecessary(oop p); | |
| 762 | |
| 1388 | 763 // It iterates over the heap and for each object it comes across it |
| 764 // will dump the contents of its reference fields, as well as | |
| 765 // liveness information for the object and its referents. The dump | |
| 766 // will be written to a file with the following name: | |
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767 // G1PrintReachableBaseFile + "." + str. |
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768 // vo decides whether the prev (vo == UsePrevMarking), the next |
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769 // (vo == UseNextMarking) marking information, or the mark word |
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770 // (vo == UseMarkWord) will be used to determine the liveness of |
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771 // each object / referent. |
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772 // If all is true, all objects in the heap will be dumped, otherwise |
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773 // only the live ones. In the dump the following symbols / breviations |
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774 // are used: |
| 1388 | 775 // M : an explicitly live object (its bitmap bit is set) |
| 776 // > : an implicitly live object (over tams) | |
| 777 // O : an object outside the G1 heap (typically: in the perm gen) | |
| 778 // NOT : a reference field whose referent is not live | |
| 779 // AND MARKED : indicates that an object is both explicitly and | |
| 780 // implicitly live (it should be one or the other, not both) | |
| 781 void print_reachable(const char* str, | |
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782 VerifyOption vo, bool all) PRODUCT_RETURN; |
| 342 | 783 |
| 784 // Clear the next marking bitmap (will be called concurrently). | |
| 785 void clearNextBitmap(); | |
| 786 | |
| 787 // These two do the work that needs to be done before and after the | |
| 788 // initial root checkpoint. Since this checkpoint can be done at two | |
| 789 // different points (i.e. an explicit pause or piggy-backed on a | |
| 790 // young collection), then it's nice to be able to easily share the | |
| 791 // pre/post code. It might be the case that we can put everything in | |
| 792 // the post method. TP | |
| 793 void checkpointRootsInitialPre(); | |
| 794 void checkpointRootsInitialPost(); | |
| 795 | |
| 796 // Do concurrent phase of marking, to a tentative transitive closure. | |
| 797 void markFromRoots(); | |
| 798 | |
| 799 // Process all unprocessed SATB buffers. It is called at the | |
| 800 // beginning of an evacuation pause. | |
| 801 void drainAllSATBBuffers(); | |
| 802 | |
| 803 void checkpointRootsFinal(bool clear_all_soft_refs); | |
| 804 void checkpointRootsFinalWork(); | |
| 805 void cleanup(); | |
| 806 void completeCleanup(); | |
| 807 | |
| 808 // Mark in the previous bitmap. NB: this is usually read-only, so use | |
| 809 // this carefully! | |
|
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810 inline void markPrev(oop p); |
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811 |
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812 // Clears marks for all objects in the given range, for the prev, |
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813 // next, or both bitmaps. NB: the previous bitmap is usually |
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814 // read-only, so use this carefully! |
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815 void clearRangePrevBitmap(MemRegion mr); |
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816 void clearRangeNextBitmap(MemRegion mr); |
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817 void clearRangeBothBitmaps(MemRegion mr); |
| 342 | 818 |
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819 // Notify data structures that a GC has started. |
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820 void note_start_of_gc() { |
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821 _markStack.note_start_of_gc(); |
| 342 | 822 } |
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823 |
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824 // Notify data structures that a GC is finished. |
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825 void note_end_of_gc() { |
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826 _markStack.note_end_of_gc(); |
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827 } |
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828 |
| 342 | 829 // Iterate over the oops in the mark stack and all local queues. It |
| 830 // also calls invalidate_entries_into_cset() on the region stack. | |
| 831 void oops_do(OopClosure* f); | |
|
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832 |
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833 // Verify that there are no CSet oops on the stacks (taskqueues / |
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834 // global mark stack), enqueued SATB buffers, per-thread SATB |
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835 // buffers, and fingers (global / per-task). The boolean parameters |
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836 // decide which of the above data structures to verify. If marking |
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837 // is not in progress, it's a no-op. |
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838 void verify_no_cset_oops(bool verify_stacks, |
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839 bool verify_enqueued_buffers, |
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840 bool verify_thread_buffers, |
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841 bool verify_fingers) PRODUCT_RETURN; |
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842 |
| 342 | 843 // It is called at the end of an evacuation pause during marking so |
| 844 // that CM is notified of where the new end of the heap is. It | |
| 845 // doesn't do anything if concurrent_marking_in_progress() is false, | |
| 846 // unless the force parameter is true. | |
| 847 void update_g1_committed(bool force = false); | |
| 848 | |
| 849 void complete_marking_in_collection_set(); | |
| 850 | |
| 851 // It indicates that a new collection set is being chosen. | |
| 852 void newCSet(); | |
|
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853 |
| 342 | 854 // It registers a collection set heap region with CM. This is used |
| 855 // to determine whether any heap regions are located above the finger. | |
| 856 void registerCSetRegion(HeapRegion* hr); | |
| 857 | |
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858 // Resets the region fields of any active CMTask whose region fields |
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859 // are in the collection set (i.e. the region currently claimed by |
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860 // the CMTask will be evacuated and may be used, subsequently, as |
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861 // an alloc region). When this happens the region fields in the CMTask |
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862 // are stale and, hence, should be cleared causing the worker thread |
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863 // to claim a new region. |
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864 void reset_active_task_region_fields_in_cset(); |
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865 |
|
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866 // Registers the maximum region-end associated with a set of |
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867 // regions with CM. Again this is used to determine whether any |
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868 // heap regions are located above the finger. |
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869 void register_collection_set_finger(HeapWord* max_finger) { |
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870 // max_finger is the highest heap region end of the regions currently |
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871 // contained in the collection set. If this value is larger than |
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872 // _min_finger then we need to gray objects. |
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873 // This routine is like registerCSetRegion but for an entire |
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874 // collection of regions. |
|
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875 if (max_finger > _min_finger) { |
|
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876 _should_gray_objects = true; |
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877 } |
|
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878 } |
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879 |
| 342 | 880 // Returns "true" if at least one mark has been completed. |
| 881 bool at_least_one_mark_complete() { return _at_least_one_mark_complete; } | |
| 882 | |
| 883 bool isMarked(oop p) const { | |
| 884 assert(p != NULL && p->is_oop(), "expected an oop"); | |
| 885 HeapWord* addr = (HeapWord*)p; | |
| 886 assert(addr >= _nextMarkBitMap->startWord() || | |
| 887 addr < _nextMarkBitMap->endWord(), "in a region"); | |
| 888 | |
| 889 return _nextMarkBitMap->isMarked(addr); | |
| 890 } | |
| 891 | |
| 892 inline bool not_yet_marked(oop p) const; | |
| 893 | |
| 894 // XXX Debug code | |
| 895 bool containing_card_is_marked(void* p); | |
| 896 bool containing_cards_are_marked(void* start, void* last); | |
| 897 | |
| 898 bool isPrevMarked(oop p) const { | |
| 899 assert(p != NULL && p->is_oop(), "expected an oop"); | |
| 900 HeapWord* addr = (HeapWord*)p; | |
| 901 assert(addr >= _prevMarkBitMap->startWord() || | |
| 902 addr < _prevMarkBitMap->endWord(), "in a region"); | |
| 903 | |
| 904 return _prevMarkBitMap->isMarked(addr); | |
| 905 } | |
| 906 | |
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907 inline bool do_yield_check(uint worker_i = 0); |
| 342 | 908 inline bool should_yield(); |
| 909 | |
| 910 // Called to abort the marking cycle after a Full GC takes palce. | |
| 911 void abort(); | |
| 912 | |
| 913 // This prints the global/local fingers. It is used for debugging. | |
| 914 NOT_PRODUCT(void print_finger();) | |
| 915 | |
| 916 void print_summary_info(); | |
| 917 | |
| 1019 | 918 void print_worker_threads_on(outputStream* st) const; |
| 919 | |
| 342 | 920 // The following indicate whether a given verbose level has been |
| 921 // set. Notice that anything above stats is conditional to | |
| 922 // _MARKING_VERBOSE_ having been set to 1 | |
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923 bool verbose_stats() { |
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924 return _verbose_level >= stats_verbose; |
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925 } |
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|
926 bool verbose_low() { |
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927 return _MARKING_VERBOSE_ && _verbose_level >= low_verbose; |
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928 } |
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|
929 bool verbose_medium() { |
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930 return _MARKING_VERBOSE_ && _verbose_level >= medium_verbose; |
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931 } |
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932 bool verbose_high() { |
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933 return _MARKING_VERBOSE_ && _verbose_level >= high_verbose; |
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934 } |
|
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935 |
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936 // Counting data structure accessors |
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937 |
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938 // Returns the card number of the bottom of the G1 heap. |
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939 // Used in biasing indices into accounting card bitmaps. |
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940 intptr_t heap_bottom_card_num() const { |
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941 return _heap_bottom_card_num; |
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942 } |
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943 |
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944 // Returns the card bitmap for a given task or worker id. |
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945 BitMap* count_card_bitmap_for(uint worker_id) { |
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946 assert(0 <= worker_id && worker_id < _max_task_num, "oob"); |
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947 assert(_count_card_bitmaps != NULL, "uninitialized"); |
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948 BitMap* task_card_bm = &_count_card_bitmaps[worker_id]; |
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949 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
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950 return task_card_bm; |
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951 } |
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952 |
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953 // Returns the array containing the marked bytes for each region, |
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954 // for the given worker or task id. |
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955 size_t* count_marked_bytes_array_for(uint worker_id) { |
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956 assert(0 <= worker_id && worker_id < _max_task_num, "oob"); |
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957 assert(_count_marked_bytes != NULL, "uninitialized"); |
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958 size_t* marked_bytes_array = _count_marked_bytes[worker_id]; |
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959 assert(marked_bytes_array != NULL, "uninitialized"); |
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960 return marked_bytes_array; |
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961 } |
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962 |
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963 // Returns the index in the liveness accounting card table bitmap |
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964 // for the given address |
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|
965 inline BitMap::idx_t card_bitmap_index_for(HeapWord* addr); |
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966 |
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967 // Counts the size of the given memory region in the the given |
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968 // marked_bytes array slot for the given HeapRegion. |
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969 // Sets the bits in the given card bitmap that are associated with the |
|
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970 // cards that are spanned by the memory region. |
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971 inline void count_region(MemRegion mr, HeapRegion* hr, |
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972 size_t* marked_bytes_array, |
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973 BitMap* task_card_bm); |
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974 |
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975 // Counts the given memory region in the task/worker counting |
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976 // data structures for the given worker id. |
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977 inline void count_region(MemRegion mr, uint worker_id); |
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978 |
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979 // Counts the given object in the given task/worker counting |
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980 // data structures. |
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981 inline void count_object(oop obj, HeapRegion* hr, |
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982 size_t* marked_bytes_array, |
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983 BitMap* task_card_bm); |
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984 |
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985 // Counts the given object in the task/worker counting data |
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986 // structures for the given worker id. |
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987 inline void count_object(oop obj, HeapRegion* hr, uint worker_id); |
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988 |
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989 // Attempts to mark the given object and, if successful, counts |
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990 // the object in the given task/worker counting structures. |
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991 inline bool par_mark_and_count(oop obj, HeapRegion* hr, |
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992 size_t* marked_bytes_array, |
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993 BitMap* task_card_bm); |
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994 |
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995 // Attempts to mark the given object and, if successful, counts |
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996 // the object in the task/worker counting structures for the |
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997 // given worker id. |
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998 inline bool par_mark_and_count(oop obj, HeapRegion* hr, uint worker_id); |
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999 |
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1000 // Similar to the above routine but we don't know the heap region that |
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1001 // contains the object to be marked/counted, which this routine looks up. |
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1002 inline bool par_mark_and_count(oop obj, uint worker_id); |
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1003 |
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1004 // Similar to the above routine but there are times when we cannot |
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1005 // safely calculate the size of obj due to races and we, therefore, |
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1006 // pass the size in as a parameter. It is the caller's reponsibility |
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1007 // to ensure that the size passed in for obj is valid. |
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1008 inline bool par_mark_and_count(oop obj, size_t word_size, uint worker_id); |
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1009 |
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1010 // Unconditionally mark the given object, and unconditinally count |
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1011 // the object in the counting structures for worker id 0. |
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1012 // Should *not* be called from parallel code. |
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1013 inline bool mark_and_count(oop obj, HeapRegion* hr); |
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1014 |
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1015 // Similar to the above routine but we don't know the heap region that |
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1016 // contains the object to be marked/counted, which this routine looks up. |
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1017 // Should *not* be called from parallel code. |
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1018 inline bool mark_and_count(oop obj); |
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1019 |
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1020 protected: |
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1021 // Clear all the per-task bitmaps and arrays used to store the |
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1022 // counting data. |
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1023 void clear_all_count_data(); |
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1024 |
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1025 // Aggregates the counting data for each worker/task |
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1026 // that was constructed while marking. Also sets |
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1027 // the amount of marked bytes for each region and |
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1028 // the top at concurrent mark count. |
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1029 void aggregate_count_data(); |
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1030 |
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1031 // Verification routine |
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1032 void verify_count_data(); |
| 342 | 1033 }; |
| 1034 | |
| 1035 // A class representing a marking task. | |
| 1036 class CMTask : public TerminatorTerminator { | |
| 1037 private: | |
| 1038 enum PrivateConstants { | |
| 1039 // the regular clock call is called once the scanned words reaches | |
| 1040 // this limit | |
| 1041 words_scanned_period = 12*1024, | |
| 1042 // the regular clock call is called once the number of visited | |
| 1043 // references reaches this limit | |
| 1044 refs_reached_period = 384, | |
| 1045 // initial value for the hash seed, used in the work stealing code | |
| 1046 init_hash_seed = 17, | |
| 1047 // how many entries will be transferred between global stack and | |
| 1048 // local queues | |
| 1049 global_stack_transfer_size = 16 | |
| 1050 }; | |
| 1051 | |
| 1052 int _task_id; | |
| 1053 G1CollectedHeap* _g1h; | |
| 1054 ConcurrentMark* _cm; | |
| 1055 CMBitMap* _nextMarkBitMap; | |
| 1056 // the task queue of this task | |
| 1057 CMTaskQueue* _task_queue; | |
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1058 private: |
| 342 | 1059 // the task queue set---needed for stealing |
| 1060 CMTaskQueueSet* _task_queues; | |
| 1061 // indicates whether the task has been claimed---this is only for | |
| 1062 // debugging purposes | |
| 1063 bool _claimed; | |
| 1064 | |
| 1065 // number of calls to this task | |
| 1066 int _calls; | |
| 1067 | |
| 1068 // when the virtual timer reaches this time, the marking step should | |
| 1069 // exit | |
| 1070 double _time_target_ms; | |
| 1071 // the start time of the current marking step | |
| 1072 double _start_time_ms; | |
| 1073 | |
| 1074 // the oop closure used for iterations over oops | |
| 3771 | 1075 G1CMOopClosure* _cm_oop_closure; |
| 342 | 1076 |
| 1077 // the region this task is scanning, NULL if we're not scanning any | |
| 1078 HeapRegion* _curr_region; | |
| 1079 // the local finger of this task, NULL if we're not scanning a region | |
| 1080 HeapWord* _finger; | |
| 1081 // limit of the region this task is scanning, NULL if we're not scanning one | |
| 1082 HeapWord* _region_limit; | |
| 1083 | |
| 1084 // This is used only when we scan regions popped from the region | |
| 1085 // stack. It records what the last object on such a region we | |
| 1086 // scanned was. It is used to ensure that, if we abort region | |
| 1087 // iteration, we do not rescan the first part of the region. This | |
| 1088 // should be NULL when we're not scanning a region from the region | |
| 1089 // stack. | |
| 1090 HeapWord* _region_finger; | |
| 1091 | |
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1092 // If we abort while scanning a region we record the remaining |
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1093 // unscanned portion and check this field when marking restarts. |
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1094 // This avoids having to push on the region stack while other |
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1095 // marking threads may still be popping regions. |
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1096 // If we were to push the unscanned portion directly to the |
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1097 // region stack then we would need to using locking versions |
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1098 // of the push and pop operations. |
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1099 MemRegion _aborted_region; |
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1100 |
| 342 | 1101 // the number of words this task has scanned |
| 1102 size_t _words_scanned; | |
| 1103 // When _words_scanned reaches this limit, the regular clock is | |
| 1104 // called. Notice that this might be decreased under certain | |
| 1105 // circumstances (i.e. when we believe that we did an expensive | |
| 1106 // operation). | |
| 1107 size_t _words_scanned_limit; | |
| 1108 // the initial value of _words_scanned_limit (i.e. what it was | |
| 1109 // before it was decreased). | |
| 1110 size_t _real_words_scanned_limit; | |
| 1111 | |
| 1112 // the number of references this task has visited | |
| 1113 size_t _refs_reached; | |
| 1114 // When _refs_reached reaches this limit, the regular clock is | |
| 1115 // called. Notice this this might be decreased under certain | |
| 1116 // circumstances (i.e. when we believe that we did an expensive | |
| 1117 // operation). | |
| 1118 size_t _refs_reached_limit; | |
| 1119 // the initial value of _refs_reached_limit (i.e. what it was before | |
| 1120 // it was decreased). | |
| 1121 size_t _real_refs_reached_limit; | |
| 1122 | |
| 1123 // used by the work stealing stuff | |
| 1124 int _hash_seed; | |
| 1125 // if this is true, then the task has aborted for some reason | |
| 1126 bool _has_aborted; | |
| 1127 // set when the task aborts because it has met its time quota | |
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1128 bool _has_timed_out; |
| 342 | 1129 // true when we're draining SATB buffers; this avoids the task |
| 1130 // aborting due to SATB buffers being available (as we're already | |
| 1131 // dealing with them) | |
| 1132 bool _draining_satb_buffers; | |
| 1133 | |
| 1134 // number sequence of past step times | |
| 1135 NumberSeq _step_times_ms; | |
| 1136 // elapsed time of this task | |
| 1137 double _elapsed_time_ms; | |
| 1138 // termination time of this task | |
| 1139 double _termination_time_ms; | |
| 1140 // when this task got into the termination protocol | |
| 1141 double _termination_start_time_ms; | |
| 1142 | |
| 1143 // true when the task is during a concurrent phase, false when it is | |
| 1144 // in the remark phase (so, in the latter case, we do not have to | |
| 1145 // check all the things that we have to check during the concurrent | |
| 1146 // phase, i.e. SATB buffer availability...) | |
| 1147 bool _concurrent; | |
| 1148 | |
| 1149 TruncatedSeq _marking_step_diffs_ms; | |
| 1150 | |
|
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1151 // Counting data structures. Embedding the task's marked_bytes_array |
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1152 // and card bitmap into the actual task saves having to go through |
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1153 // the ConcurrentMark object. |
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1154 size_t* _marked_bytes_array; |
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1155 BitMap* _card_bm; |
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1156 |
| 342 | 1157 // LOTS of statistics related with this task |
| 1158 #if _MARKING_STATS_ | |
| 1159 NumberSeq _all_clock_intervals_ms; | |
| 1160 double _interval_start_time_ms; | |
| 1161 | |
| 1162 int _aborted; | |
| 1163 int _aborted_overflow; | |
| 1164 int _aborted_cm_aborted; | |
| 1165 int _aborted_yield; | |
| 1166 int _aborted_timed_out; | |
| 1167 int _aborted_satb; | |
| 1168 int _aborted_termination; | |
| 1169 | |
| 1170 int _steal_attempts; | |
| 1171 int _steals; | |
| 1172 | |
| 1173 int _clock_due_to_marking; | |
| 1174 int _clock_due_to_scanning; | |
| 1175 | |
| 1176 int _local_pushes; | |
| 1177 int _local_pops; | |
| 1178 int _local_max_size; | |
| 1179 int _objs_scanned; | |
| 1180 | |
| 1181 int _global_pushes; | |
| 1182 int _global_pops; | |
| 1183 int _global_max_size; | |
| 1184 | |
| 1185 int _global_transfers_to; | |
| 1186 int _global_transfers_from; | |
| 1187 | |
| 1188 int _region_stack_pops; | |
| 1189 | |
| 1190 int _regions_claimed; | |
| 1191 int _objs_found_on_bitmap; | |
| 1192 | |
| 1193 int _satb_buffers_processed; | |
| 1194 #endif // _MARKING_STATS_ | |
| 1195 | |
| 1196 // it updates the local fields after this task has claimed | |
| 1197 // a new region to scan | |
| 1198 void setup_for_region(HeapRegion* hr); | |
| 1199 // it brings up-to-date the limit of the region | |
| 1200 void update_region_limit(); | |
| 1201 | |
| 1202 // called when either the words scanned or the refs visited limit | |
| 1203 // has been reached | |
| 1204 void reached_limit(); | |
| 1205 // recalculates the words scanned and refs visited limits | |
| 1206 void recalculate_limits(); | |
| 1207 // decreases the words scanned and refs visited limits when we reach | |
| 1208 // an expensive operation | |
| 1209 void decrease_limits(); | |
| 1210 // it checks whether the words scanned or refs visited reached their | |
| 1211 // respective limit and calls reached_limit() if they have | |
| 1212 void check_limits() { | |
| 1213 if (_words_scanned >= _words_scanned_limit || | |
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1214 _refs_reached >= _refs_reached_limit) { |
| 342 | 1215 reached_limit(); |
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1216 } |
| 342 | 1217 } |
| 1218 // this is supposed to be called regularly during a marking step as | |
| 1219 // it checks a bunch of conditions that might cause the marking step | |
| 1220 // to abort | |
| 1221 void regular_clock_call(); | |
| 1222 bool concurrent() { return _concurrent; } | |
| 1223 | |
| 1224 public: | |
| 1225 // It resets the task; it should be called right at the beginning of | |
| 1226 // a marking phase. | |
| 1227 void reset(CMBitMap* _nextMarkBitMap); | |
| 1228 // it clears all the fields that correspond to a claimed region. | |
| 1229 void clear_region_fields(); | |
| 1230 | |
| 1231 void set_concurrent(bool concurrent) { _concurrent = concurrent; } | |
| 1232 | |
| 1233 // The main method of this class which performs a marking step | |
| 1234 // trying not to exceed the given duration. However, it might exit | |
| 1235 // prematurely, according to some conditions (i.e. SATB buffers are | |
| 1236 // available for processing). | |
|
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1237 void do_marking_step(double target_ms, bool do_stealing, bool do_termination); |
| 342 | 1238 |
| 1239 // These two calls start and stop the timer | |
| 1240 void record_start_time() { | |
| 1241 _elapsed_time_ms = os::elapsedTime() * 1000.0; | |
| 1242 } | |
| 1243 void record_end_time() { | |
| 1244 _elapsed_time_ms = os::elapsedTime() * 1000.0 - _elapsed_time_ms; | |
| 1245 } | |
| 1246 | |
| 1247 // returns the task ID | |
| 1248 int task_id() { return _task_id; } | |
| 1249 | |
| 1250 // From TerminatorTerminator. It determines whether this task should | |
| 1251 // exit the termination protocol after it's entered it. | |
| 1252 virtual bool should_exit_termination(); | |
| 1253 | |
|
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1254 // Resets the local region fields after a task has finished scanning a |
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1255 // region; or when they have become stale as a result of the region |
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1256 // being evacuated. |
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1257 void giveup_current_region(); |
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1258 |
| 342 | 1259 HeapWord* finger() { return _finger; } |
| 1260 | |
| 1261 bool has_aborted() { return _has_aborted; } | |
| 1262 void set_has_aborted() { _has_aborted = true; } | |
| 1263 void clear_has_aborted() { _has_aborted = false; } | |
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1264 bool has_timed_out() { return _has_timed_out; } |
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1265 bool claimed() { return _claimed; } |
| 342 | 1266 |
|
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1267 // Support routines for the partially scanned region that may be |
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1268 // recorded as a result of aborting while draining the CMRegionStack |
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1269 MemRegion aborted_region() { return _aborted_region; } |
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1270 void set_aborted_region(MemRegion mr) |
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1271 { _aborted_region = mr; } |
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1272 |
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1273 // Clears any recorded partially scanned region |
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1274 void clear_aborted_region() { set_aborted_region(MemRegion()); } |
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1275 |
| 3771 | 1276 void set_cm_oop_closure(G1CMOopClosure* cm_oop_closure); |
| 342 | 1277 |
| 1278 // It grays the object by marking it and, if necessary, pushing it | |
| 1279 // on the local queue | |
| 3771 | 1280 inline void deal_with_reference(oop obj); |
| 342 | 1281 |
| 1282 // It scans an object and visits its children. | |
| 3771 | 1283 void scan_object(oop obj); |
| 342 | 1284 |
| 1285 // It pushes an object on the local queue. | |
| 3771 | 1286 inline void push(oop obj); |
| 342 | 1287 |
| 1288 // These two move entries to/from the global stack. | |
| 1289 void move_entries_to_global_stack(); | |
| 1290 void get_entries_from_global_stack(); | |
| 1291 | |
| 1292 // It pops and scans objects from the local queue. If partially is | |
| 1293 // true, then it stops when the queue size is of a given limit. If | |
| 1294 // partially is false, then it stops when the queue is empty. | |
| 1295 void drain_local_queue(bool partially); | |
| 1296 // It moves entries from the global stack to the local queue and | |
| 1297 // drains the local queue. If partially is true, then it stops when | |
| 1298 // both the global stack and the local queue reach a given size. If | |
| 1299 // partially if false, it tries to empty them totally. | |
| 1300 void drain_global_stack(bool partially); | |
| 1301 // It keeps picking SATB buffers and processing them until no SATB | |
| 1302 // buffers are available. | |
| 1303 void drain_satb_buffers(); | |
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1304 |
| 342 | 1305 // It keeps popping regions from the region stack and processing |
| 1306 // them until the region stack is empty. | |
| 1307 void drain_region_stack(BitMapClosure* closure); | |
| 1308 | |
| 1309 // moves the local finger to a new location | |
| 1310 inline void move_finger_to(HeapWord* new_finger) { | |
|
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1311 assert(new_finger >= _finger && new_finger < _region_limit, "invariant"); |
| 342 | 1312 _finger = new_finger; |
| 1313 } | |
| 1314 | |
| 1315 // moves the region finger to a new location | |
| 1316 inline void move_region_finger_to(HeapWord* new_finger) { | |
|
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1317 assert(new_finger < _cm->finger(), "invariant"); |
| 342 | 1318 _region_finger = new_finger; |
| 1319 } | |
| 1320 | |
| 1321 CMTask(int task_num, ConcurrentMark *cm, | |
|
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1322 size_t* marked_bytes, BitMap* card_bm, |
| 342 | 1323 CMTaskQueue* task_queue, CMTaskQueueSet* task_queues); |
| 1324 | |
| 1325 // it prints statistics associated with this task | |
| 1326 void print_stats(); | |
| 1327 | |
| 1328 #if _MARKING_STATS_ | |
| 1329 void increase_objs_found_on_bitmap() { ++_objs_found_on_bitmap; } | |
| 1330 #endif // _MARKING_STATS_ | |
| 1331 }; | |
| 1972 | 1332 |
|
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1333 // Class that's used to to print out per-region liveness |
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1334 // information. It's currently used at the end of marking and also |
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1335 // after we sort the old regions at the end of the cleanup operation. |
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1336 class G1PrintRegionLivenessInfoClosure: public HeapRegionClosure { |
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1337 private: |
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1338 outputStream* _out; |
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1339 |
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1340 // Accumulators for these values. |
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1341 size_t _total_used_bytes; |
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1342 size_t _total_capacity_bytes; |
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1343 size_t _total_prev_live_bytes; |
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1344 size_t _total_next_live_bytes; |
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1345 |
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1346 // These are set up when we come across a "stars humongous" region |
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1347 // (as this is where most of this information is stored, not in the |
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1348 // subsequent "continues humongous" regions). After that, for every |
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1349 // region in a given humongous region series we deduce the right |
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1350 // values for it by simply subtracting the appropriate amount from |
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1351 // these fields. All these values should reach 0 after we've visited |
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1352 // the last region in the series. |
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1353 size_t _hum_used_bytes; |
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1354 size_t _hum_capacity_bytes; |
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1355 size_t _hum_prev_live_bytes; |
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1356 size_t _hum_next_live_bytes; |
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1357 |
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1358 static double perc(size_t val, size_t total) { |
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1359 if (total == 0) { |
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1360 return 0.0; |
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1361 } else { |
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1362 return 100.0 * ((double) val / (double) total); |
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1363 } |
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1364 } |
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1365 |
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1366 static double bytes_to_mb(size_t val) { |
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1367 return (double) val / (double) M; |
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1368 } |
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1369 |
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1370 // See the .cpp file. |
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1371 size_t get_hum_bytes(size_t* hum_bytes); |
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1372 void get_hum_bytes(size_t* used_bytes, size_t* capacity_bytes, |
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1373 size_t* prev_live_bytes, size_t* next_live_bytes); |
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1374 |
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1375 public: |
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1376 // The header and footer are printed in the constructor and |
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1377 // destructor respectively. |
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1378 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name); |
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1379 virtual bool doHeapRegion(HeapRegion* r); |
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1380 ~G1PrintRegionLivenessInfoClosure(); |
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1381 }; |
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1382 |
| 1972 | 1383 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP |