Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.hpp @ 8008:256d3f43c177
8005875: G1: Kitchensink fails with ParallelGCThreads=0
Summary: Check that the concurrent marking worker gang exists in ConcurrentMark::print_worker_threads_on(). Changes were also reviewed by Vitaly Davidovich <vitalyd@gmail.com>.
Reviewed-by: brutisso
| author | johnc |
|---|---|
| date | Thu, 31 Jan 2013 10:45:09 -0800 |
| parents | d275c3dc73e6 |
| children | f90b9bceb8e5 |
| rev | line source |
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| 342 | 1 /* |
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2 * Copyright (c) 2001, 2013, 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; | |
| 6197 | 33 typedef GenericTaskQueue<oop, mtGC> CMTaskQueue; |
| 34 typedef GenericTaskQueueSet<CMTaskQueue, mtGC> 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) : _g1(g1) { } |
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46 |
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47 void do_object(oop obj) { |
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48 ShouldNotCallThis(); |
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49 } |
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50 bool do_object_b(oop obj); |
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51 }; |
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52 |
| 342 | 53 // A generic CM bit map. This is essentially a wrapper around the BitMap |
| 54 // class, with one bit per (1<<_shifter) HeapWords. | |
| 55 | |
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56 class CMBitMapRO VALUE_OBJ_CLASS_SPEC { |
| 342 | 57 protected: |
| 58 HeapWord* _bmStartWord; // base address of range covered by map | |
| 59 size_t _bmWordSize; // map size (in #HeapWords covered) | |
| 60 const int _shifter; // map to char or bit | |
| 61 VirtualSpace _virtual_space; // underlying the bit map | |
| 62 BitMap _bm; // the bit map itself | |
| 63 | |
| 64 public: | |
| 65 // constructor | |
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66 CMBitMapRO(int shifter); |
| 342 | 67 |
| 68 enum { do_yield = true }; | |
| 69 | |
| 70 // inquiries | |
| 71 HeapWord* startWord() const { return _bmStartWord; } | |
| 72 size_t sizeInWords() const { return _bmWordSize; } | |
| 73 // the following is one past the last word in space | |
| 74 HeapWord* endWord() const { return _bmStartWord + _bmWordSize; } | |
| 75 | |
| 76 // read marks | |
| 77 | |
| 78 bool isMarked(HeapWord* addr) const { | |
| 79 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
| 80 "outside underlying space?"); | |
| 81 return _bm.at(heapWordToOffset(addr)); | |
| 82 } | |
| 83 | |
| 84 // iteration | |
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85 inline bool iterate(BitMapClosure* cl, MemRegion mr); |
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86 inline bool iterate(BitMapClosure* cl); |
| 342 | 87 |
| 88 // Return the address corresponding to the next marked bit at or after | |
| 89 // "addr", and before "limit", if "limit" is non-NULL. If there is no | |
| 90 // such bit, returns "limit" if that is non-NULL, or else "endWord()". | |
| 91 HeapWord* getNextMarkedWordAddress(HeapWord* addr, | |
| 92 HeapWord* limit = NULL) const; | |
| 93 // Return the address corresponding to the next unmarked bit at or after | |
| 94 // "addr", and before "limit", if "limit" is non-NULL. If there is no | |
| 95 // such bit, returns "limit" if that is non-NULL, or else "endWord()". | |
| 96 HeapWord* getNextUnmarkedWordAddress(HeapWord* addr, | |
| 97 HeapWord* limit = NULL) const; | |
| 98 | |
| 99 // conversion utilities | |
| 100 // XXX Fix these so that offsets are size_t's... | |
| 101 HeapWord* offsetToHeapWord(size_t offset) const { | |
| 102 return _bmStartWord + (offset << _shifter); | |
| 103 } | |
| 104 size_t heapWordToOffset(HeapWord* addr) const { | |
| 105 return pointer_delta(addr, _bmStartWord) >> _shifter; | |
| 106 } | |
| 107 int heapWordDiffToOffsetDiff(size_t diff) const; | |
| 108 HeapWord* nextWord(HeapWord* addr) { | |
| 109 return offsetToHeapWord(heapWordToOffset(addr) + 1); | |
| 110 } | |
| 111 | |
| 112 // debugging | |
| 113 NOT_PRODUCT(bool covers(ReservedSpace rs) const;) | |
| 114 }; | |
| 115 | |
| 116 class CMBitMap : public CMBitMapRO { | |
| 117 | |
| 118 public: | |
| 119 // constructor | |
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120 CMBitMap(int shifter) : |
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121 CMBitMapRO(shifter) {} |
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122 |
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123 // Allocates the back store for the marking bitmap |
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124 bool allocate(ReservedSpace heap_rs); |
| 342 | 125 |
| 126 // write marks | |
| 127 void mark(HeapWord* addr) { | |
| 128 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
| 129 "outside underlying space?"); | |
| 3771 | 130 _bm.set_bit(heapWordToOffset(addr)); |
| 342 | 131 } |
| 132 void clear(HeapWord* addr) { | |
| 133 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
| 134 "outside underlying space?"); | |
| 3771 | 135 _bm.clear_bit(heapWordToOffset(addr)); |
| 342 | 136 } |
| 137 bool parMark(HeapWord* addr) { | |
| 138 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
| 139 "outside underlying space?"); | |
| 3771 | 140 return _bm.par_set_bit(heapWordToOffset(addr)); |
| 342 | 141 } |
| 142 bool parClear(HeapWord* addr) { | |
| 143 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
| 144 "outside underlying space?"); | |
| 3771 | 145 return _bm.par_clear_bit(heapWordToOffset(addr)); |
| 342 | 146 } |
| 147 void markRange(MemRegion mr); | |
| 148 void clearAll(); | |
| 149 void clearRange(MemRegion mr); | |
| 150 | |
| 151 // Starting at the bit corresponding to "addr" (inclusive), find the next | |
| 152 // "1" bit, if any. This bit starts some run of consecutive "1"'s; find | |
| 153 // the end of this run (stopping at "end_addr"). Return the MemRegion | |
| 154 // covering from the start of the region corresponding to the first bit | |
| 155 // of the run to the end of the region corresponding to the last bit of | |
| 156 // the run. If there is no "1" bit at or after "addr", return an empty | |
| 157 // MemRegion. | |
| 158 MemRegion getAndClearMarkedRegion(HeapWord* addr, HeapWord* end_addr); | |
| 159 }; | |
| 160 | |
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161 // Represents a marking stack used by ConcurrentMarking in the G1 collector. |
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162 class CMMarkStack VALUE_OBJ_CLASS_SPEC { |
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163 VirtualSpace _virtual_space; // Underlying backing store for actual stack |
| 342 | 164 ConcurrentMark* _cm; |
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165 oop* _base; // bottom of stack |
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166 jint _index; // one more than last occupied index |
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167 jint _capacity; // max #elements |
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168 jint _saved_index; // value of _index saved at start of GC |
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169 NOT_PRODUCT(jint _max_depth;) // max depth plumbed during run |
| 342 | 170 |
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171 bool _overflow; |
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172 bool _should_expand; |
| 342 | 173 DEBUG_ONLY(bool _drain_in_progress;) |
| 174 DEBUG_ONLY(bool _drain_in_progress_yields;) | |
| 175 | |
| 176 public: | |
| 177 CMMarkStack(ConcurrentMark* cm); | |
| 178 ~CMMarkStack(); | |
| 179 | |
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180 #ifndef PRODUCT |
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181 jint max_depth() const { |
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182 return _max_depth; |
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183 } |
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184 #endif |
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185 |
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186 bool allocate(size_t capacity); |
| 342 | 187 |
| 188 oop pop() { | |
| 189 if (!isEmpty()) { | |
| 190 return _base[--_index] ; | |
| 191 } | |
| 192 return NULL; | |
| 193 } | |
| 194 | |
| 195 // If overflow happens, don't do the push, and record the overflow. | |
| 196 // *Requires* that "ptr" is already marked. | |
| 197 void push(oop ptr) { | |
| 198 if (isFull()) { | |
| 199 // Record overflow. | |
| 200 _overflow = true; | |
| 201 return; | |
| 202 } else { | |
| 203 _base[_index++] = ptr; | |
| 204 NOT_PRODUCT(_max_depth = MAX2(_max_depth, _index)); | |
| 205 } | |
| 206 } | |
| 207 // Non-block impl. Note: concurrency is allowed only with other | |
| 208 // "par_push" operations, not with "pop" or "drain". We would need | |
| 209 // parallel versions of them if such concurrency was desired. | |
| 210 void par_push(oop ptr); | |
| 211 | |
| 212 // Pushes the first "n" elements of "ptr_arr" on the stack. | |
| 213 // Non-block impl. Note: concurrency is allowed only with other | |
| 214 // "par_adjoin_arr" or "push" operations, not with "pop" or "drain". | |
| 215 void par_adjoin_arr(oop* ptr_arr, int n); | |
| 216 | |
| 217 // Pushes the first "n" elements of "ptr_arr" on the stack. | |
| 218 // Locking impl: concurrency is allowed only with | |
| 219 // "par_push_arr" and/or "par_pop_arr" operations, which use the same | |
| 220 // locking strategy. | |
| 221 void par_push_arr(oop* ptr_arr, int n); | |
| 222 | |
| 223 // If returns false, the array was empty. Otherwise, removes up to "max" | |
| 224 // elements from the stack, and transfers them to "ptr_arr" in an | |
| 225 // unspecified order. The actual number transferred is given in "n" ("n | |
| 226 // == 0" is deliberately redundant with the return value.) Locking impl: | |
| 227 // concurrency is allowed only with "par_push_arr" and/or "par_pop_arr" | |
| 228 // operations, which use the same locking strategy. | |
| 229 bool par_pop_arr(oop* ptr_arr, int max, int* n); | |
| 230 | |
| 231 // Drain the mark stack, applying the given closure to all fields of | |
| 232 // objects on the stack. (That is, continue until the stack is empty, | |
| 233 // even if closure applications add entries to the stack.) The "bm" | |
| 234 // argument, if non-null, may be used to verify that only marked objects | |
| 235 // are on the mark stack. If "yield_after" is "true", then the | |
| 236 // concurrent marker performing the drain offers to yield after | |
| 237 // processing each object. If a yield occurs, stops the drain operation | |
| 238 // and returns false. Otherwise, returns true. | |
| 239 template<class OopClosureClass> | |
| 240 bool drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after = false); | |
| 241 | |
| 242 bool isEmpty() { return _index == 0; } | |
| 243 bool isFull() { return _index == _capacity; } | |
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244 int maxElems() { return _capacity; } |
| 342 | 245 |
| 246 bool overflow() { return _overflow; } | |
| 247 void clear_overflow() { _overflow = false; } | |
| 248 | |
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249 bool should_expand() const { return _should_expand; } |
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250 void set_should_expand(); |
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251 |
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252 // Expand the stack, typically in response to an overflow condition |
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253 void expand(); |
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254 |
| 342 | 255 int size() { return _index; } |
| 256 | |
| 257 void setEmpty() { _index = 0; clear_overflow(); } | |
| 258 | |
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259 // Record the current index. |
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260 void note_start_of_gc(); |
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261 |
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262 // Make sure that we have not added any entries to the stack during GC. |
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263 void note_end_of_gc(); |
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264 |
| 342 | 265 // iterate over the oops in the mark stack, up to the bound recorded via |
| 266 // the call above. | |
| 267 void oops_do(OopClosure* f); | |
| 268 }; | |
| 269 | |
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270 class ForceOverflowSettings VALUE_OBJ_CLASS_SPEC { |
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271 private: |
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272 #ifndef PRODUCT |
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273 uintx _num_remaining; |
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274 bool _force; |
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275 #endif // !defined(PRODUCT) |
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276 |
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277 public: |
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278 void init() PRODUCT_RETURN; |
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279 void update() PRODUCT_RETURN; |
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280 bool should_force() PRODUCT_RETURN_( return false; ); |
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281 }; |
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282 |
| 342 | 283 // this will enable a variety of different statistics per GC task |
| 284 #define _MARKING_STATS_ 0 | |
| 285 // this will enable the higher verbose levels | |
| 286 #define _MARKING_VERBOSE_ 0 | |
| 287 | |
| 288 #if _MARKING_STATS_ | |
| 289 #define statsOnly(statement) \ | |
| 290 do { \ | |
| 291 statement ; \ | |
| 292 } while (0) | |
| 293 #else // _MARKING_STATS_ | |
| 294 #define statsOnly(statement) \ | |
| 295 do { \ | |
| 296 } while (0) | |
| 297 #endif // _MARKING_STATS_ | |
| 298 | |
| 299 typedef enum { | |
| 300 no_verbose = 0, // verbose turned off | |
| 301 stats_verbose, // only prints stats at the end of marking | |
| 302 low_verbose, // low verbose, mostly per region and per major event | |
| 303 medium_verbose, // a bit more detailed than low | |
| 304 high_verbose // per object verbose | |
| 305 } CMVerboseLevel; | |
| 306 | |
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307 class YoungList; |
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308 |
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309 // Root Regions are regions that are not empty at the beginning of a |
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310 // marking cycle and which we might collect during an evacuation pause |
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311 // while the cycle is active. Given that, during evacuation pauses, we |
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312 // do not copy objects that are explicitly marked, what we have to do |
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313 // for the root regions is to scan them and mark all objects reachable |
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314 // from them. According to the SATB assumptions, we only need to visit |
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315 // each object once during marking. So, as long as we finish this scan |
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316 // before the next evacuation pause, we can copy the objects from the |
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317 // root regions without having to mark them or do anything else to them. |
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318 // |
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319 // Currently, we only support root region scanning once (at the start |
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320 // of the marking cycle) and the root regions are all the survivor |
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321 // regions populated during the initial-mark pause. |
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322 class CMRootRegions VALUE_OBJ_CLASS_SPEC { |
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323 private: |
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324 YoungList* _young_list; |
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325 ConcurrentMark* _cm; |
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326 |
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327 volatile bool _scan_in_progress; |
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328 volatile bool _should_abort; |
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329 HeapRegion* volatile _next_survivor; |
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330 |
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331 public: |
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332 CMRootRegions(); |
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333 // We actually do most of the initialization in this method. |
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334 void init(G1CollectedHeap* g1h, ConcurrentMark* cm); |
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335 |
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336 // Reset the claiming / scanning of the root regions. |
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337 void prepare_for_scan(); |
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338 |
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339 // Forces get_next() to return NULL so that the iteration aborts early. |
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340 void abort() { _should_abort = true; } |
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341 |
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342 // Return true if the CM thread are actively scanning root regions, |
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343 // false otherwise. |
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344 bool scan_in_progress() { return _scan_in_progress; } |
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345 |
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346 // Claim the next root region to scan atomically, or return NULL if |
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347 // all have been claimed. |
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348 HeapRegion* claim_next(); |
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349 |
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350 // Flag that we're done with root region scanning and notify anyone |
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351 // who's waiting on it. If aborted is false, assume that all regions |
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352 // have been claimed. |
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353 void scan_finished(); |
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354 |
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355 // If CM threads are still scanning root regions, wait until they |
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356 // are done. Return true if we had to wait, false otherwise. |
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357 bool wait_until_scan_finished(); |
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358 }; |
| 342 | 359 |
| 360 class ConcurrentMarkThread; | |
| 361 | |
| 6197 | 362 class ConcurrentMark: public CHeapObj<mtGC> { |
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363 friend class CMMarkStack; |
| 342 | 364 friend class ConcurrentMarkThread; |
| 365 friend class CMTask; | |
| 366 friend class CMBitMapClosure; | |
| 367 friend class CMGlobalObjectClosure; | |
| 368 friend class CMRemarkTask; | |
| 369 friend class CMConcurrentMarkingTask; | |
| 370 friend class G1ParNoteEndTask; | |
| 371 friend class CalcLiveObjectsClosure; | |
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372 friend class G1CMRefProcTaskProxy; |
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373 friend class G1CMRefProcTaskExecutor; |
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374 friend class G1CMParKeepAliveAndDrainClosure; |
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375 friend class G1CMParDrainMarkingStackClosure; |
| 342 | 376 |
| 377 protected: | |
| 378 ConcurrentMarkThread* _cmThread; // the thread doing the work | |
| 379 G1CollectedHeap* _g1h; // the heap. | |
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380 uint _parallel_marking_threads; // the number of marking |
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381 // threads we're use |
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382 uint _max_parallel_marking_threads; // max number of marking |
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383 // threads we'll ever use |
| 342 | 384 double _sleep_factor; // how much we have to sleep, with |
| 385 // respect to the work we just did, to | |
| 386 // meet the marking overhead goal | |
| 387 double _marking_task_overhead; // marking target overhead for | |
| 388 // a single task | |
| 389 | |
| 390 // same as the two above, but for the cleanup task | |
| 391 double _cleanup_sleep_factor; | |
| 392 double _cleanup_task_overhead; | |
| 393 | |
| 2152 | 394 FreeRegionList _cleanup_list; |
| 342 | 395 |
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396 // Concurrent marking support structures |
| 342 | 397 CMBitMap _markBitMap1; |
| 398 CMBitMap _markBitMap2; | |
| 399 CMBitMapRO* _prevMarkBitMap; // completed mark bitmap | |
| 400 CMBitMap* _nextMarkBitMap; // under-construction mark bitmap | |
| 401 | |
| 402 BitMap _region_bm; | |
| 403 BitMap _card_bm; | |
| 404 | |
| 405 // Heap bounds | |
| 406 HeapWord* _heap_start; | |
| 407 HeapWord* _heap_end; | |
| 408 | |
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409 // Root region tracking and claiming. |
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410 CMRootRegions _root_regions; |
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411 |
| 342 | 412 // For gray objects |
| 413 CMMarkStack _markStack; // Grey objects behind global finger. | |
| 414 HeapWord* volatile _finger; // the global finger, region aligned, | |
| 415 // always points to the end of the | |
| 416 // last claimed region | |
| 417 | |
| 418 // marking tasks | |
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419 uint _max_worker_id;// maximum worker id |
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420 uint _active_tasks; // task num currently active |
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421 CMTask** _tasks; // task queue array (max_worker_id len) |
| 342 | 422 CMTaskQueueSet* _task_queues; // task queue set |
| 423 ParallelTaskTerminator _terminator; // for termination | |
| 424 | |
| 425 // Two sync barriers that are used to synchronise tasks when an | |
| 426 // overflow occurs. The algorithm is the following. All tasks enter | |
| 427 // the first one to ensure that they have all stopped manipulating | |
| 428 // the global data structures. After they exit it, they re-initialise | |
| 429 // their data structures and task 0 re-initialises the global data | |
| 430 // structures. Then, they enter the second sync barrier. This | |
| 431 // ensure, that no task starts doing work before all data | |
| 432 // structures (local and global) have been re-initialised. When they | |
| 433 // exit it, they are free to start working again. | |
| 434 WorkGangBarrierSync _first_overflow_barrier_sync; | |
| 435 WorkGangBarrierSync _second_overflow_barrier_sync; | |
| 436 | |
| 437 // this is set by any task, when an overflow on the global data | |
| 438 // structures is detected. | |
| 439 volatile bool _has_overflown; | |
| 440 // true: marking is concurrent, false: we're in remark | |
| 441 volatile bool _concurrent; | |
| 442 // set at the end of a Full GC so that marking aborts | |
| 443 volatile bool _has_aborted; | |
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444 |
| 342 | 445 // used when remark aborts due to an overflow to indicate that |
| 446 // another concurrent marking phase should start | |
| 447 volatile bool _restart_for_overflow; | |
| 448 | |
| 449 // This is true from the very start of concurrent marking until the | |
| 450 // point when all the tasks complete their work. It is really used | |
| 451 // to determine the points between the end of concurrent marking and | |
| 452 // time of remark. | |
| 453 volatile bool _concurrent_marking_in_progress; | |
| 454 | |
| 455 // verbose level | |
| 456 CMVerboseLevel _verbose_level; | |
| 457 | |
| 458 // All of these times are in ms. | |
| 459 NumberSeq _init_times; | |
| 460 NumberSeq _remark_times; | |
| 461 NumberSeq _remark_mark_times; | |
| 462 NumberSeq _remark_weak_ref_times; | |
| 463 NumberSeq _cleanup_times; | |
| 464 double _total_counting_time; | |
| 465 double _total_rs_scrub_time; | |
| 466 | |
| 467 double* _accum_task_vtime; // accumulated task vtime | |
| 468 | |
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469 FlexibleWorkGang* _parallel_workers; |
| 342 | 470 |
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471 ForceOverflowSettings _force_overflow_conc; |
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472 ForceOverflowSettings _force_overflow_stw; |
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473 |
| 342 | 474 void weakRefsWork(bool clear_all_soft_refs); |
| 475 | |
| 476 void swapMarkBitMaps(); | |
| 477 | |
| 478 // It resets the global marking data structures, as well as the | |
| 479 // task local ones; should be called during initial mark. | |
| 480 void reset(); | |
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481 |
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482 // Resets all the marking data structures. Called when we have to restart |
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483 // marking or when marking completes (via set_non_marking_state below). |
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484 void reset_marking_state(bool clear_overflow = true); |
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485 |
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486 // We do this after we're done with marking so that the marking data |
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487 // structures are initialised to a sensible and predictable state. |
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488 void set_non_marking_state(); |
| 342 | 489 |
| 490 // It should be called to indicate which phase we're in (concurrent | |
| 491 // mark or remark) and how many threads are currently active. | |
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492 void set_phase(uint active_tasks, bool concurrent); |
| 342 | 493 |
| 494 // prints all gathered CM-related statistics | |
| 495 void print_stats(); | |
| 496 | |
| 2152 | 497 bool cleanup_list_is_empty() { |
| 498 return _cleanup_list.is_empty(); | |
| 499 } | |
| 500 | |
| 342 | 501 // accessor methods |
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502 uint parallel_marking_threads() const { return _parallel_marking_threads; } |
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503 uint max_parallel_marking_threads() const { return _max_parallel_marking_threads;} |
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504 double sleep_factor() { return _sleep_factor; } |
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505 double marking_task_overhead() { return _marking_task_overhead;} |
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506 double cleanup_sleep_factor() { return _cleanup_sleep_factor; } |
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507 double cleanup_task_overhead() { return _cleanup_task_overhead;} |
| 342 | 508 |
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509 bool use_parallel_marking_threads() const { |
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510 assert(parallel_marking_threads() <= |
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511 max_parallel_marking_threads(), "sanity"); |
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512 assert((_parallel_workers == NULL && parallel_marking_threads() == 0) || |
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513 parallel_marking_threads() > 0, |
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514 "parallel workers not set up correctly"); |
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515 return _parallel_workers != NULL; |
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516 } |
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517 |
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518 HeapWord* finger() { return _finger; } |
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519 bool concurrent() { return _concurrent; } |
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520 uint active_tasks() { return _active_tasks; } |
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521 ParallelTaskTerminator* terminator() { return &_terminator; } |
| 342 | 522 |
| 523 // It claims the next available region to be scanned by a marking | |
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524 // task/thread. It might return NULL if the next region is empty or |
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525 // we have run out of regions. In the latter case, out_of_regions() |
| 342 | 526 // determines whether we've really run out of regions or the task |
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527 // should call claim_region() again. This might seem a bit |
| 342 | 528 // awkward. Originally, the code was written so that claim_region() |
| 529 // either successfully returned with a non-empty region or there | |
| 530 // were no more regions to be claimed. The problem with this was | |
| 531 // that, in certain circumstances, it iterated over large chunks of | |
| 532 // the heap finding only empty regions and, while it was working, it | |
| 533 // was preventing the calling task to call its regular clock | |
| 534 // method. So, this way, each task will spend very little time in | |
| 535 // claim_region() and is allowed to call the regular clock method | |
| 536 // frequently. | |
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537 HeapRegion* claim_region(uint worker_id); |
| 342 | 538 |
| 539 // It determines whether we've run out of regions to scan. | |
| 540 bool out_of_regions() { return _finger == _heap_end; } | |
| 541 | |
| 542 // Returns the task with the given id | |
| 543 CMTask* task(int id) { | |
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544 assert(0 <= id && id < (int) _active_tasks, |
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545 "task id not within active bounds"); |
| 342 | 546 return _tasks[id]; |
| 547 } | |
| 548 | |
| 549 // Returns the task queue with the given id | |
| 550 CMTaskQueue* task_queue(int id) { | |
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551 assert(0 <= id && id < (int) _active_tasks, |
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552 "task queue id not within active bounds"); |
| 342 | 553 return (CMTaskQueue*) _task_queues->queue(id); |
| 554 } | |
| 555 | |
| 556 // Returns the task queue set | |
| 557 CMTaskQueueSet* task_queues() { return _task_queues; } | |
| 558 | |
| 559 // Access / manipulation of the overflow flag which is set to | |
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560 // indicate that the global stack has overflown |
| 342 | 561 bool has_overflown() { return _has_overflown; } |
| 562 void set_has_overflown() { _has_overflown = true; } | |
| 563 void clear_has_overflown() { _has_overflown = false; } | |
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564 bool restart_for_overflow() { return _restart_for_overflow; } |
| 342 | 565 |
| 566 bool has_aborted() { return _has_aborted; } | |
| 567 | |
| 568 // Methods to enter the two overflow sync barriers | |
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569 void enter_first_sync_barrier(uint worker_id); |
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570 void enter_second_sync_barrier(uint worker_id); |
| 342 | 571 |
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572 ForceOverflowSettings* force_overflow_conc() { |
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573 return &_force_overflow_conc; |
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574 } |
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575 |
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576 ForceOverflowSettings* force_overflow_stw() { |
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577 return &_force_overflow_stw; |
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578 } |
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579 |
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580 ForceOverflowSettings* force_overflow() { |
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581 if (concurrent()) { |
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582 return force_overflow_conc(); |
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583 } else { |
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584 return force_overflow_stw(); |
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585 } |
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586 } |
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587 |
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588 // Live Data Counting data structures... |
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589 // These data structures are initialized at the start of |
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590 // marking. They are written to while marking is active. |
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591 // They are aggregated during remark; the aggregated values |
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592 // are then used to populate the _region_bm, _card_bm, and |
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593 // the total live bytes, which are then subsequently updated |
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594 // during cleanup. |
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595 |
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596 // An array of bitmaps (one bit map per task). Each bitmap |
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597 // is used to record the cards spanned by the live objects |
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598 // marked by that task/worker. |
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599 BitMap* _count_card_bitmaps; |
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600 |
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601 // Used to record the number of marked live bytes |
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602 // (for each region, by worker thread). |
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603 size_t** _count_marked_bytes; |
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604 |
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605 // Card index of the bottom of the G1 heap. Used for biasing indices into |
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606 // the card bitmaps. |
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607 intptr_t _heap_bottom_card_num; |
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608 |
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609 // Set to true when initialization is complete |
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610 bool _completed_initialization; |
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611 |
| 342 | 612 public: |
| 613 // Manipulation of the global mark stack. | |
| 614 // Notice that the first mark_stack_push is CAS-based, whereas the | |
| 615 // two below are Mutex-based. This is OK since the first one is only | |
| 616 // called during evacuation pauses and doesn't compete with the | |
| 617 // other two (which are called by the marking tasks during | |
| 618 // concurrent marking or remark). | |
| 619 bool mark_stack_push(oop p) { | |
| 620 _markStack.par_push(p); | |
| 621 if (_markStack.overflow()) { | |
| 622 set_has_overflown(); | |
| 623 return false; | |
| 624 } | |
| 625 return true; | |
| 626 } | |
| 627 bool mark_stack_push(oop* arr, int n) { | |
| 628 _markStack.par_push_arr(arr, n); | |
| 629 if (_markStack.overflow()) { | |
| 630 set_has_overflown(); | |
| 631 return false; | |
| 632 } | |
| 633 return true; | |
| 634 } | |
| 635 void mark_stack_pop(oop* arr, int max, int* n) { | |
| 636 _markStack.par_pop_arr(arr, max, n); | |
| 637 } | |
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638 size_t mark_stack_size() { return _markStack.size(); } |
| 342 | 639 size_t partial_mark_stack_size_target() { return _markStack.maxElems()/3; } |
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640 bool mark_stack_overflow() { return _markStack.overflow(); } |
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641 bool mark_stack_empty() { return _markStack.isEmpty(); } |
| 342 | 642 |
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643 CMRootRegions* root_regions() { return &_root_regions; } |
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644 |
| 342 | 645 bool concurrent_marking_in_progress() { |
| 646 return _concurrent_marking_in_progress; | |
| 647 } | |
| 648 void set_concurrent_marking_in_progress() { | |
| 649 _concurrent_marking_in_progress = true; | |
| 650 } | |
| 651 void clear_concurrent_marking_in_progress() { | |
| 652 _concurrent_marking_in_progress = false; | |
| 653 } | |
| 654 | |
| 655 void update_accum_task_vtime(int i, double vtime) { | |
| 656 _accum_task_vtime[i] += vtime; | |
| 657 } | |
| 658 | |
| 659 double all_task_accum_vtime() { | |
| 660 double ret = 0.0; | |
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661 for (uint i = 0; i < _max_worker_id; ++i) |
| 342 | 662 ret += _accum_task_vtime[i]; |
| 663 return ret; | |
| 664 } | |
| 665 | |
| 666 // Attempts to steal an object from the task queues of other tasks | |
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667 bool try_stealing(uint worker_id, int* hash_seed, oop& obj) { |
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668 return _task_queues->steal(worker_id, hash_seed, obj); |
| 342 | 669 } |
| 670 | |
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671 ConcurrentMark(G1CollectedHeap* g1h, ReservedSpace heap_rs); |
| 342 | 672 ~ConcurrentMark(); |
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673 |
| 342 | 674 ConcurrentMarkThread* cmThread() { return _cmThread; } |
| 675 | |
| 676 CMBitMapRO* prevMarkBitMap() const { return _prevMarkBitMap; } | |
| 677 CMBitMap* nextMarkBitMap() const { return _nextMarkBitMap; } | |
| 678 | |
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679 // Returns the number of GC threads to be used in a concurrent |
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680 // phase based on the number of GC threads being used in a STW |
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681 // phase. |
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682 uint scale_parallel_threads(uint n_par_threads); |
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683 |
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684 // Calculates the number of GC threads to be used in a concurrent phase. |
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685 uint calc_parallel_marking_threads(); |
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686 |
| 342 | 687 // The following three are interaction between CM and |
| 688 // G1CollectedHeap | |
| 689 | |
| 690 // This notifies CM that a root during initial-mark needs to be | |
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691 // grayed. It is MT-safe. word_size is the size of the object in |
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692 // words. It is passed explicitly as sometimes we cannot calculate |
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693 // it from the given object because it might be in an inconsistent |
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694 // state (e.g., in to-space and being copied). So the caller is |
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695 // responsible for dealing with this issue (e.g., get the size from |
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696 // the from-space image when the to-space image might be |
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697 // inconsistent) and always passing the size. hr is the region that |
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698 // contains the object and it's passed optionally from callers who |
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699 // might already have it (no point in recalculating it). |
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700 inline void grayRoot(oop obj, size_t word_size, |
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701 uint worker_id, HeapRegion* hr = NULL); |
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702 |
| 1388 | 703 // It iterates over the heap and for each object it comes across it |
| 704 // will dump the contents of its reference fields, as well as | |
| 705 // liveness information for the object and its referents. The dump | |
| 706 // will be written to a file with the following name: | |
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707 // G1PrintReachableBaseFile + "." + str. |
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708 // vo decides whether the prev (vo == UsePrevMarking), the next |
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709 // (vo == UseNextMarking) marking information, or the mark word |
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710 // (vo == UseMarkWord) will be used to determine the liveness of |
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711 // each object / referent. |
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712 // If all is true, all objects in the heap will be dumped, otherwise |
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713 // only the live ones. In the dump the following symbols / breviations |
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714 // are used: |
| 1388 | 715 // M : an explicitly live object (its bitmap bit is set) |
| 716 // > : an implicitly live object (over tams) | |
| 717 // O : an object outside the G1 heap (typically: in the perm gen) | |
| 718 // NOT : a reference field whose referent is not live | |
| 719 // AND MARKED : indicates that an object is both explicitly and | |
| 720 // implicitly live (it should be one or the other, not both) | |
| 721 void print_reachable(const char* str, | |
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722 VerifyOption vo, bool all) PRODUCT_RETURN; |
| 342 | 723 |
| 724 // Clear the next marking bitmap (will be called concurrently). | |
| 725 void clearNextBitmap(); | |
| 726 | |
| 727 // These two do the work that needs to be done before and after the | |
| 728 // initial root checkpoint. Since this checkpoint can be done at two | |
| 729 // different points (i.e. an explicit pause or piggy-backed on a | |
| 730 // young collection), then it's nice to be able to easily share the | |
| 731 // pre/post code. It might be the case that we can put everything in | |
| 732 // the post method. TP | |
| 733 void checkpointRootsInitialPre(); | |
| 734 void checkpointRootsInitialPost(); | |
| 735 | |
|
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736 // Scan all the root regions and mark everything reachable from |
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737 // them. |
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738 void scanRootRegions(); |
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739 |
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740 // Scan a single root region and mark everything reachable from it. |
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741 void scanRootRegion(HeapRegion* hr, uint worker_id); |
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742 |
| 342 | 743 // Do concurrent phase of marking, to a tentative transitive closure. |
| 744 void markFromRoots(); | |
| 745 | |
| 746 void checkpointRootsFinal(bool clear_all_soft_refs); | |
| 747 void checkpointRootsFinalWork(); | |
| 748 void cleanup(); | |
| 749 void completeCleanup(); | |
| 750 | |
| 751 // Mark in the previous bitmap. NB: this is usually read-only, so use | |
| 752 // this carefully! | |
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753 inline void markPrev(oop p); |
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754 |
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755 // Clears marks for all objects in the given range, for the prev, |
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756 // next, or both bitmaps. NB: the previous bitmap is usually |
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757 // read-only, so use this carefully! |
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758 void clearRangePrevBitmap(MemRegion mr); |
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759 void clearRangeNextBitmap(MemRegion mr); |
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760 void clearRangeBothBitmaps(MemRegion mr); |
| 342 | 761 |
|
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762 // Notify data structures that a GC has started. |
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763 void note_start_of_gc() { |
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764 _markStack.note_start_of_gc(); |
| 342 | 765 } |
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766 |
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767 // Notify data structures that a GC is finished. |
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768 void note_end_of_gc() { |
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769 _markStack.note_end_of_gc(); |
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770 } |
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771 |
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772 // Verify that there are no CSet oops on the stacks (taskqueues / |
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773 // global mark stack), enqueued SATB buffers, per-thread SATB |
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774 // buffers, and fingers (global / per-task). The boolean parameters |
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775 // decide which of the above data structures to verify. If marking |
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776 // is not in progress, it's a no-op. |
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777 void verify_no_cset_oops(bool verify_stacks, |
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778 bool verify_enqueued_buffers, |
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779 bool verify_thread_buffers, |
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780 bool verify_fingers) PRODUCT_RETURN; |
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781 |
| 342 | 782 // It is called at the end of an evacuation pause during marking so |
| 783 // that CM is notified of where the new end of the heap is. It | |
| 784 // doesn't do anything if concurrent_marking_in_progress() is false, | |
| 785 // unless the force parameter is true. | |
| 786 void update_g1_committed(bool force = false); | |
| 787 | |
| 788 bool isMarked(oop p) const { | |
| 789 assert(p != NULL && p->is_oop(), "expected an oop"); | |
| 790 HeapWord* addr = (HeapWord*)p; | |
| 791 assert(addr >= _nextMarkBitMap->startWord() || | |
| 792 addr < _nextMarkBitMap->endWord(), "in a region"); | |
| 793 | |
| 794 return _nextMarkBitMap->isMarked(addr); | |
| 795 } | |
| 796 | |
| 797 inline bool not_yet_marked(oop p) const; | |
| 798 | |
| 799 // XXX Debug code | |
| 800 bool containing_card_is_marked(void* p); | |
| 801 bool containing_cards_are_marked(void* start, void* last); | |
| 802 | |
| 803 bool isPrevMarked(oop p) const { | |
| 804 assert(p != NULL && p->is_oop(), "expected an oop"); | |
| 805 HeapWord* addr = (HeapWord*)p; | |
| 806 assert(addr >= _prevMarkBitMap->startWord() || | |
| 807 addr < _prevMarkBitMap->endWord(), "in a region"); | |
| 808 | |
| 809 return _prevMarkBitMap->isMarked(addr); | |
| 810 } | |
| 811 | |
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812 inline bool do_yield_check(uint worker_i = 0); |
| 342 | 813 inline bool should_yield(); |
| 814 | |
| 815 // Called to abort the marking cycle after a Full GC takes palce. | |
| 816 void abort(); | |
| 817 | |
| 818 // This prints the global/local fingers. It is used for debugging. | |
| 819 NOT_PRODUCT(void print_finger();) | |
| 820 | |
| 821 void print_summary_info(); | |
| 822 | |
| 1019 | 823 void print_worker_threads_on(outputStream* st) const; |
| 824 | |
| 342 | 825 // The following indicate whether a given verbose level has been |
| 826 // set. Notice that anything above stats is conditional to | |
| 827 // _MARKING_VERBOSE_ having been set to 1 | |
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828 bool verbose_stats() { |
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829 return _verbose_level >= stats_verbose; |
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830 } |
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831 bool verbose_low() { |
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832 return _MARKING_VERBOSE_ && _verbose_level >= low_verbose; |
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833 } |
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834 bool verbose_medium() { |
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835 return _MARKING_VERBOSE_ && _verbose_level >= medium_verbose; |
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836 } |
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837 bool verbose_high() { |
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838 return _MARKING_VERBOSE_ && _verbose_level >= high_verbose; |
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839 } |
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840 |
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841 // Liveness counting |
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842 |
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843 // Utility routine to set an exclusive range of cards on the given |
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844 // card liveness bitmap |
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845 inline void set_card_bitmap_range(BitMap* card_bm, |
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846 BitMap::idx_t start_idx, |
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847 BitMap::idx_t end_idx, |
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848 bool is_par); |
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849 |
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850 // Returns the card number of the bottom of the G1 heap. |
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851 // Used in biasing indices into accounting card bitmaps. |
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852 intptr_t heap_bottom_card_num() const { |
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853 return _heap_bottom_card_num; |
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854 } |
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855 |
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856 // Returns the card bitmap for a given task or worker id. |
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857 BitMap* count_card_bitmap_for(uint worker_id) { |
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858 assert(0 <= worker_id && worker_id < _max_worker_id, "oob"); |
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859 assert(_count_card_bitmaps != NULL, "uninitialized"); |
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860 BitMap* task_card_bm = &_count_card_bitmaps[worker_id]; |
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861 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
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862 return task_card_bm; |
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863 } |
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864 |
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865 // Returns the array containing the marked bytes for each region, |
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866 // for the given worker or task id. |
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867 size_t* count_marked_bytes_array_for(uint worker_id) { |
|
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868 assert(0 <= worker_id && worker_id < _max_worker_id, "oob"); |
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869 assert(_count_marked_bytes != NULL, "uninitialized"); |
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870 size_t* marked_bytes_array = _count_marked_bytes[worker_id]; |
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871 assert(marked_bytes_array != NULL, "uninitialized"); |
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872 return marked_bytes_array; |
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873 } |
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874 |
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875 // Returns the index in the liveness accounting card table bitmap |
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876 // for the given address |
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877 inline BitMap::idx_t card_bitmap_index_for(HeapWord* addr); |
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878 |
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879 // Counts the size of the given memory region in the the given |
|
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880 // marked_bytes array slot for the given HeapRegion. |
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881 // Sets the bits in the given card bitmap that are associated with the |
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882 // cards that are spanned by the memory region. |
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883 inline void count_region(MemRegion mr, HeapRegion* hr, |
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884 size_t* marked_bytes_array, |
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885 BitMap* task_card_bm); |
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886 |
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887 // Counts the given memory region in the task/worker counting |
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888 // data structures for the given worker id. |
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889 inline void count_region(MemRegion mr, HeapRegion* hr, uint worker_id); |
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890 |
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891 // Counts the given memory region in the task/worker counting |
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892 // data structures for the given worker id. |
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893 inline void count_region(MemRegion mr, uint worker_id); |
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894 |
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895 // Counts the given object in the given task/worker counting |
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896 // data structures. |
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897 inline void count_object(oop obj, HeapRegion* hr, |
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898 size_t* marked_bytes_array, |
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899 BitMap* task_card_bm); |
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900 |
|
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901 // Counts the given object in the task/worker counting data |
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902 // structures for the given worker id. |
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903 inline void count_object(oop obj, HeapRegion* hr, uint worker_id); |
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904 |
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905 // Attempts to mark the given object and, if successful, counts |
|
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906 // the object in the given task/worker counting structures. |
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907 inline bool par_mark_and_count(oop obj, HeapRegion* hr, |
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908 size_t* marked_bytes_array, |
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909 BitMap* task_card_bm); |
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910 |
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911 // Attempts to mark the given object and, if successful, counts |
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912 // the object in the task/worker counting structures for the |
|
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913 // given worker id. |
|
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914 inline bool par_mark_and_count(oop obj, size_t word_size, |
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915 HeapRegion* hr, uint worker_id); |
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916 |
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917 // Attempts to mark the given object and, if successful, counts |
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918 // the object in the task/worker counting structures for the |
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919 // given worker id. |
|
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920 inline bool par_mark_and_count(oop obj, HeapRegion* hr, uint worker_id); |
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921 |
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922 // Similar to the above routine but we don't know the heap region that |
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923 // contains the object to be marked/counted, which this routine looks up. |
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924 inline bool par_mark_and_count(oop obj, uint worker_id); |
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925 |
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926 // Similar to the above routine but there are times when we cannot |
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927 // safely calculate the size of obj due to races and we, therefore, |
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928 // pass the size in as a parameter. It is the caller's reponsibility |
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929 // to ensure that the size passed in for obj is valid. |
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930 inline bool par_mark_and_count(oop obj, size_t word_size, uint worker_id); |
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931 |
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932 // Unconditionally mark the given object, and unconditinally count |
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933 // the object in the counting structures for worker id 0. |
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934 // Should *not* be called from parallel code. |
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935 inline bool mark_and_count(oop obj, HeapRegion* hr); |
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936 |
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937 // Similar to the above routine but we don't know the heap region that |
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938 // contains the object to be marked/counted, which this routine looks up. |
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939 // Should *not* be called from parallel code. |
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940 inline bool mark_and_count(oop obj); |
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941 |
|
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942 // Returns true if initialization was successfully completed. |
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943 bool completed_initialization() const { |
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944 return _completed_initialization; |
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945 } |
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946 |
|
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947 protected: |
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948 // Clear all the per-task bitmaps and arrays used to store the |
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949 // counting data. |
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950 void clear_all_count_data(); |
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951 |
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952 // Aggregates the counting data for each worker/task |
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953 // that was constructed while marking. Also sets |
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954 // the amount of marked bytes for each region and |
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955 // the top at concurrent mark count. |
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956 void aggregate_count_data(); |
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957 |
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958 // Verification routine |
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959 void verify_count_data(); |
| 342 | 960 }; |
| 961 | |
| 962 // A class representing a marking task. | |
| 963 class CMTask : public TerminatorTerminator { | |
| 964 private: | |
| 965 enum PrivateConstants { | |
| 966 // the regular clock call is called once the scanned words reaches | |
| 967 // this limit | |
| 968 words_scanned_period = 12*1024, | |
| 969 // the regular clock call is called once the number of visited | |
| 970 // references reaches this limit | |
| 971 refs_reached_period = 384, | |
| 972 // initial value for the hash seed, used in the work stealing code | |
| 973 init_hash_seed = 17, | |
| 974 // how many entries will be transferred between global stack and | |
| 975 // local queues | |
| 976 global_stack_transfer_size = 16 | |
| 977 }; | |
| 978 | |
|
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979 uint _worker_id; |
| 342 | 980 G1CollectedHeap* _g1h; |
| 981 ConcurrentMark* _cm; | |
| 982 CMBitMap* _nextMarkBitMap; | |
| 983 // the task queue of this task | |
| 984 CMTaskQueue* _task_queue; | |
|
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985 private: |
| 342 | 986 // the task queue set---needed for stealing |
| 987 CMTaskQueueSet* _task_queues; | |
| 988 // indicates whether the task has been claimed---this is only for | |
| 989 // debugging purposes | |
| 990 bool _claimed; | |
| 991 | |
| 992 // number of calls to this task | |
| 993 int _calls; | |
| 994 | |
| 995 // when the virtual timer reaches this time, the marking step should | |
| 996 // exit | |
| 997 double _time_target_ms; | |
| 998 // the start time of the current marking step | |
| 999 double _start_time_ms; | |
| 1000 | |
| 1001 // the oop closure used for iterations over oops | |
| 3771 | 1002 G1CMOopClosure* _cm_oop_closure; |
| 342 | 1003 |
| 1004 // the region this task is scanning, NULL if we're not scanning any | |
| 1005 HeapRegion* _curr_region; | |
| 1006 // the local finger of this task, NULL if we're not scanning a region | |
| 1007 HeapWord* _finger; | |
| 1008 // limit of the region this task is scanning, NULL if we're not scanning one | |
| 1009 HeapWord* _region_limit; | |
| 1010 | |
| 1011 // the number of words this task has scanned | |
| 1012 size_t _words_scanned; | |
| 1013 // When _words_scanned reaches this limit, the regular clock is | |
| 1014 // called. Notice that this might be decreased under certain | |
| 1015 // circumstances (i.e. when we believe that we did an expensive | |
| 1016 // operation). | |
| 1017 size_t _words_scanned_limit; | |
| 1018 // the initial value of _words_scanned_limit (i.e. what it was | |
| 1019 // before it was decreased). | |
| 1020 size_t _real_words_scanned_limit; | |
| 1021 | |
| 1022 // the number of references this task has visited | |
| 1023 size_t _refs_reached; | |
| 1024 // When _refs_reached reaches this limit, the regular clock is | |
| 1025 // called. Notice this this might be decreased under certain | |
| 1026 // circumstances (i.e. when we believe that we did an expensive | |
| 1027 // operation). | |
| 1028 size_t _refs_reached_limit; | |
| 1029 // the initial value of _refs_reached_limit (i.e. what it was before | |
| 1030 // it was decreased). | |
| 1031 size_t _real_refs_reached_limit; | |
| 1032 | |
| 1033 // used by the work stealing stuff | |
| 1034 int _hash_seed; | |
| 1035 // if this is true, then the task has aborted for some reason | |
| 1036 bool _has_aborted; | |
| 1037 // set when the task aborts because it has met its time quota | |
|
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1038 bool _has_timed_out; |
| 342 | 1039 // true when we're draining SATB buffers; this avoids the task |
| 1040 // aborting due to SATB buffers being available (as we're already | |
| 1041 // dealing with them) | |
| 1042 bool _draining_satb_buffers; | |
| 1043 | |
| 1044 // number sequence of past step times | |
| 1045 NumberSeq _step_times_ms; | |
| 1046 // elapsed time of this task | |
| 1047 double _elapsed_time_ms; | |
| 1048 // termination time of this task | |
| 1049 double _termination_time_ms; | |
| 1050 // when this task got into the termination protocol | |
| 1051 double _termination_start_time_ms; | |
| 1052 | |
| 1053 // true when the task is during a concurrent phase, false when it is | |
| 1054 // in the remark phase (so, in the latter case, we do not have to | |
| 1055 // check all the things that we have to check during the concurrent | |
| 1056 // phase, i.e. SATB buffer availability...) | |
| 1057 bool _concurrent; | |
| 1058 | |
| 1059 TruncatedSeq _marking_step_diffs_ms; | |
| 1060 | |
|
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1061 // Counting data structures. Embedding the task's marked_bytes_array |
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1062 // and card bitmap into the actual task saves having to go through |
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1063 // the ConcurrentMark object. |
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1064 size_t* _marked_bytes_array; |
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1065 BitMap* _card_bm; |
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1066 |
| 342 | 1067 // LOTS of statistics related with this task |
| 1068 #if _MARKING_STATS_ | |
| 1069 NumberSeq _all_clock_intervals_ms; | |
| 1070 double _interval_start_time_ms; | |
| 1071 | |
| 1072 int _aborted; | |
| 1073 int _aborted_overflow; | |
| 1074 int _aborted_cm_aborted; | |
| 1075 int _aborted_yield; | |
| 1076 int _aborted_timed_out; | |
| 1077 int _aborted_satb; | |
| 1078 int _aborted_termination; | |
| 1079 | |
| 1080 int _steal_attempts; | |
| 1081 int _steals; | |
| 1082 | |
| 1083 int _clock_due_to_marking; | |
| 1084 int _clock_due_to_scanning; | |
| 1085 | |
| 1086 int _local_pushes; | |
| 1087 int _local_pops; | |
| 1088 int _local_max_size; | |
| 1089 int _objs_scanned; | |
| 1090 | |
| 1091 int _global_pushes; | |
| 1092 int _global_pops; | |
| 1093 int _global_max_size; | |
| 1094 | |
| 1095 int _global_transfers_to; | |
| 1096 int _global_transfers_from; | |
| 1097 | |
| 1098 int _regions_claimed; | |
| 1099 int _objs_found_on_bitmap; | |
| 1100 | |
| 1101 int _satb_buffers_processed; | |
| 1102 #endif // _MARKING_STATS_ | |
| 1103 | |
| 1104 // it updates the local fields after this task has claimed | |
| 1105 // a new region to scan | |
| 1106 void setup_for_region(HeapRegion* hr); | |
| 1107 // it brings up-to-date the limit of the region | |
| 1108 void update_region_limit(); | |
| 1109 | |
| 1110 // called when either the words scanned or the refs visited limit | |
| 1111 // has been reached | |
| 1112 void reached_limit(); | |
| 1113 // recalculates the words scanned and refs visited limits | |
| 1114 void recalculate_limits(); | |
| 1115 // decreases the words scanned and refs visited limits when we reach | |
| 1116 // an expensive operation | |
| 1117 void decrease_limits(); | |
| 1118 // it checks whether the words scanned or refs visited reached their | |
| 1119 // respective limit and calls reached_limit() if they have | |
| 1120 void check_limits() { | |
| 1121 if (_words_scanned >= _words_scanned_limit || | |
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1122 _refs_reached >= _refs_reached_limit) { |
| 342 | 1123 reached_limit(); |
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1124 } |
| 342 | 1125 } |
| 1126 // this is supposed to be called regularly during a marking step as | |
| 1127 // it checks a bunch of conditions that might cause the marking step | |
| 1128 // to abort | |
| 1129 void regular_clock_call(); | |
| 1130 bool concurrent() { return _concurrent; } | |
| 1131 | |
| 1132 public: | |
| 1133 // It resets the task; it should be called right at the beginning of | |
| 1134 // a marking phase. | |
| 1135 void reset(CMBitMap* _nextMarkBitMap); | |
| 1136 // it clears all the fields that correspond to a claimed region. | |
| 1137 void clear_region_fields(); | |
| 1138 | |
| 1139 void set_concurrent(bool concurrent) { _concurrent = concurrent; } | |
| 1140 | |
| 1141 // The main method of this class which performs a marking step | |
| 1142 // trying not to exceed the given duration. However, it might exit | |
| 1143 // prematurely, according to some conditions (i.e. SATB buffers are | |
| 1144 // available for processing). | |
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1145 void do_marking_step(double target_ms, bool do_stealing, bool do_termination); |
| 342 | 1146 |
| 1147 // These two calls start and stop the timer | |
| 1148 void record_start_time() { | |
| 1149 _elapsed_time_ms = os::elapsedTime() * 1000.0; | |
| 1150 } | |
| 1151 void record_end_time() { | |
| 1152 _elapsed_time_ms = os::elapsedTime() * 1000.0 - _elapsed_time_ms; | |
| 1153 } | |
| 1154 | |
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1155 // returns the worker ID associated with this task. |
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1156 uint worker_id() { return _worker_id; } |
| 342 | 1157 |
| 1158 // From TerminatorTerminator. It determines whether this task should | |
| 1159 // exit the termination protocol after it's entered it. | |
| 1160 virtual bool should_exit_termination(); | |
| 1161 | |
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1162 // Resets the local region fields after a task has finished scanning a |
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1163 // region; or when they have become stale as a result of the region |
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1164 // being evacuated. |
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1165 void giveup_current_region(); |
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1166 |
| 342 | 1167 HeapWord* finger() { return _finger; } |
| 1168 | |
| 1169 bool has_aborted() { return _has_aborted; } | |
| 1170 void set_has_aborted() { _has_aborted = true; } | |
| 1171 void clear_has_aborted() { _has_aborted = false; } | |
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1172 bool has_timed_out() { return _has_timed_out; } |
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1173 bool claimed() { return _claimed; } |
| 342 | 1174 |
| 3771 | 1175 void set_cm_oop_closure(G1CMOopClosure* cm_oop_closure); |
| 342 | 1176 |
| 1177 // It grays the object by marking it and, if necessary, pushing it | |
| 1178 // on the local queue | |
| 3771 | 1179 inline void deal_with_reference(oop obj); |
| 342 | 1180 |
| 1181 // It scans an object and visits its children. | |
| 3771 | 1182 void scan_object(oop obj); |
| 342 | 1183 |
| 1184 // It pushes an object on the local queue. | |
| 3771 | 1185 inline void push(oop obj); |
| 342 | 1186 |
| 1187 // These two move entries to/from the global stack. | |
| 1188 void move_entries_to_global_stack(); | |
| 1189 void get_entries_from_global_stack(); | |
| 1190 | |
| 1191 // It pops and scans objects from the local queue. If partially is | |
| 1192 // true, then it stops when the queue size is of a given limit. If | |
| 1193 // partially is false, then it stops when the queue is empty. | |
| 1194 void drain_local_queue(bool partially); | |
| 1195 // It moves entries from the global stack to the local queue and | |
| 1196 // drains the local queue. If partially is true, then it stops when | |
| 1197 // both the global stack and the local queue reach a given size. If | |
| 1198 // partially if false, it tries to empty them totally. | |
| 1199 void drain_global_stack(bool partially); | |
| 1200 // It keeps picking SATB buffers and processing them until no SATB | |
| 1201 // buffers are available. | |
| 1202 void drain_satb_buffers(); | |
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1203 |
| 342 | 1204 // moves the local finger to a new location |
| 1205 inline void move_finger_to(HeapWord* new_finger) { | |
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1206 assert(new_finger >= _finger && new_finger < _region_limit, "invariant"); |
| 342 | 1207 _finger = new_finger; |
| 1208 } | |
| 1209 | |
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1210 CMTask(uint worker_id, ConcurrentMark *cm, |
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1211 size_t* marked_bytes, BitMap* card_bm, |
| 342 | 1212 CMTaskQueue* task_queue, CMTaskQueueSet* task_queues); |
| 1213 | |
| 1214 // it prints statistics associated with this task | |
| 1215 void print_stats(); | |
| 1216 | |
| 1217 #if _MARKING_STATS_ | |
| 1218 void increase_objs_found_on_bitmap() { ++_objs_found_on_bitmap; } | |
| 1219 #endif // _MARKING_STATS_ | |
| 1220 }; | |
| 1972 | 1221 |
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1222 // Class that's used to to print out per-region liveness |
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1223 // information. It's currently used at the end of marking and also |
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1224 // after we sort the old regions at the end of the cleanup operation. |
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1225 class G1PrintRegionLivenessInfoClosure: public HeapRegionClosure { |
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1226 private: |
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1227 outputStream* _out; |
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1228 |
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1229 // Accumulators for these values. |
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1230 size_t _total_used_bytes; |
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1231 size_t _total_capacity_bytes; |
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1232 size_t _total_prev_live_bytes; |
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1233 size_t _total_next_live_bytes; |
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1234 |
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1235 // These are set up when we come across a "stars humongous" region |
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1236 // (as this is where most of this information is stored, not in the |
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1237 // subsequent "continues humongous" regions). After that, for every |
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1238 // region in a given humongous region series we deduce the right |
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1239 // values for it by simply subtracting the appropriate amount from |
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1240 // these fields. All these values should reach 0 after we've visited |
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1241 // the last region in the series. |
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1242 size_t _hum_used_bytes; |
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1243 size_t _hum_capacity_bytes; |
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1244 size_t _hum_prev_live_bytes; |
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1245 size_t _hum_next_live_bytes; |
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1246 |
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1247 static double perc(size_t val, size_t total) { |
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1248 if (total == 0) { |
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1249 return 0.0; |
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1250 } else { |
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1251 return 100.0 * ((double) val / (double) total); |
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1252 } |
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1253 } |
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1254 |
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1255 static double bytes_to_mb(size_t val) { |
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1256 return (double) val / (double) M; |
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1257 } |
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1258 |
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1259 // See the .cpp file. |
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1260 size_t get_hum_bytes(size_t* hum_bytes); |
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1261 void get_hum_bytes(size_t* used_bytes, size_t* capacity_bytes, |
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1262 size_t* prev_live_bytes, size_t* next_live_bytes); |
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1263 |
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1264 public: |
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1265 // The header and footer are printed in the constructor and |
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1266 // destructor respectively. |
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1267 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name); |
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1268 virtual bool doHeapRegion(HeapRegion* r); |
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1269 ~G1PrintRegionLivenessInfoClosure(); |
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1270 }; |
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1271 |
| 1972 | 1272 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP |