Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.hpp @ 20190:0982ec23da03
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
Reviewed-by: jwilhelm, ehelin, tschatzl
| author | brutisso |
|---|---|
| date | Thu, 19 Jun 2014 13:31:14 +0200 |
| parents | 8a140676873f |
| children | 581e70386ec9 |
| rev | line source |
|---|---|
| 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 | |
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28 #include "gc_implementation/g1/heapRegionSet.hpp" |
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29 #include "gc_implementation/shared/gcId.hpp" |
| 1972 | 30 #include "utilities/taskqueue.hpp" |
| 31 | |
| 342 | 32 class G1CollectedHeap; |
| 33 class CMTask; | |
| 6197 | 34 typedef GenericTaskQueue<oop, mtGC> CMTaskQueue; |
| 35 typedef GenericTaskQueueSet<CMTaskQueue, mtGC> CMTaskQueueSet; | |
| 342 | 36 |
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37 // Closure used by CM during concurrent reference discovery |
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38 // and reference processing (during remarking) to determine |
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39 // if a particular object is alive. It is primarily used |
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40 // to determine if referents of discovered reference objects |
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41 // are alive. An instance is also embedded into the |
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42 // reference processor as the _is_alive_non_header field |
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43 class G1CMIsAliveClosure: public BoolObjectClosure { |
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44 G1CollectedHeap* _g1; |
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45 public: |
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46 G1CMIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) { } |
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47 |
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48 bool do_object_b(oop obj); |
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49 }; |
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50 |
| 342 | 51 // A generic CM bit map. This is essentially a wrapper around the BitMap |
| 52 // class, with one bit per (1<<_shifter) HeapWords. | |
| 53 | |
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54 class CMBitMapRO VALUE_OBJ_CLASS_SPEC { |
| 342 | 55 protected: |
| 56 HeapWord* _bmStartWord; // base address of range covered by map | |
| 57 size_t _bmWordSize; // map size (in #HeapWords covered) | |
| 58 const int _shifter; // map to char or bit | |
| 59 VirtualSpace _virtual_space; // underlying the bit map | |
| 60 BitMap _bm; // the bit map itself | |
| 61 | |
| 62 public: | |
| 63 // constructor | |
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64 CMBitMapRO(int shifter); |
| 342 | 65 |
| 66 enum { do_yield = true }; | |
| 67 | |
| 68 // inquiries | |
| 69 HeapWord* startWord() const { return _bmStartWord; } | |
| 70 size_t sizeInWords() const { return _bmWordSize; } | |
| 71 // the following is one past the last word in space | |
| 72 HeapWord* endWord() const { return _bmStartWord + _bmWordSize; } | |
| 73 | |
| 74 // read marks | |
| 75 | |
| 76 bool isMarked(HeapWord* addr) const { | |
| 77 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
| 78 "outside underlying space?"); | |
| 79 return _bm.at(heapWordToOffset(addr)); | |
| 80 } | |
| 81 | |
| 82 // iteration | |
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83 inline bool iterate(BitMapClosure* cl, MemRegion mr); |
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84 inline bool iterate(BitMapClosure* cl); |
| 342 | 85 |
| 86 // Return the address corresponding to the next marked bit at or after | |
| 87 // "addr", and before "limit", if "limit" is non-NULL. If there is no | |
| 88 // such bit, returns "limit" if that is non-NULL, or else "endWord()". | |
| 89 HeapWord* getNextMarkedWordAddress(HeapWord* addr, | |
| 90 HeapWord* limit = NULL) const; | |
| 91 // Return the address corresponding to the next unmarked bit at or after | |
| 92 // "addr", and before "limit", if "limit" is non-NULL. If there is no | |
| 93 // such bit, returns "limit" if that is non-NULL, or else "endWord()". | |
| 94 HeapWord* getNextUnmarkedWordAddress(HeapWord* addr, | |
| 95 HeapWord* limit = NULL) const; | |
| 96 | |
| 97 // conversion utilities | |
| 98 HeapWord* offsetToHeapWord(size_t offset) const { | |
| 99 return _bmStartWord + (offset << _shifter); | |
| 100 } | |
| 101 size_t heapWordToOffset(HeapWord* addr) const { | |
| 102 return pointer_delta(addr, _bmStartWord) >> _shifter; | |
| 103 } | |
| 104 int heapWordDiffToOffsetDiff(size_t diff) const; | |
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105 |
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106 // The argument addr should be the start address of a valid object |
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107 HeapWord* nextObject(HeapWord* addr) { |
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108 oop obj = (oop) addr; |
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109 HeapWord* res = addr + obj->size(); |
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110 assert(offsetToHeapWord(heapWordToOffset(res)) == res, "sanity"); |
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111 return res; |
| 342 | 112 } |
| 113 | |
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114 void print_on_error(outputStream* st, const char* prefix) const; |
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115 |
| 342 | 116 // debugging |
| 117 NOT_PRODUCT(bool covers(ReservedSpace rs) const;) | |
| 118 }; | |
| 119 | |
| 120 class CMBitMap : public CMBitMapRO { | |
| 121 | |
| 122 public: | |
| 123 // constructor | |
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124 CMBitMap(int shifter) : |
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125 CMBitMapRO(shifter) {} |
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126 |
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127 // Allocates the back store for the marking bitmap |
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128 bool allocate(ReservedSpace heap_rs); |
| 342 | 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 | |
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165 // Represents a marking stack used by ConcurrentMarking in the G1 collector. |
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166 class CMMarkStack VALUE_OBJ_CLASS_SPEC { |
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167 VirtualSpace _virtual_space; // Underlying backing store for actual stack |
| 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 |
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173 NOT_PRODUCT(jint _max_depth;) // max depth plumbed during run |
| 342 | 174 |
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175 bool _overflow; |
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176 bool _should_expand; |
| 342 | 177 DEBUG_ONLY(bool _drain_in_progress;) |
| 178 DEBUG_ONLY(bool _drain_in_progress_yields;) | |
| 179 | |
| 180 public: | |
| 181 CMMarkStack(ConcurrentMark* cm); | |
| 182 ~CMMarkStack(); | |
| 183 | |
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184 #ifndef PRODUCT |
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185 jint max_depth() const { |
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186 return _max_depth; |
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187 } |
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188 #endif |
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189 |
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190 bool allocate(size_t capacity); |
| 342 | 191 |
| 192 oop pop() { | |
| 193 if (!isEmpty()) { | |
| 194 return _base[--_index] ; | |
| 195 } | |
| 196 return NULL; | |
| 197 } | |
| 198 | |
| 199 // If overflow happens, don't do the push, and record the overflow. | |
| 200 // *Requires* that "ptr" is already marked. | |
| 201 void push(oop ptr) { | |
| 202 if (isFull()) { | |
| 203 // Record overflow. | |
| 204 _overflow = true; | |
| 205 return; | |
| 206 } else { | |
| 207 _base[_index++] = ptr; | |
| 208 NOT_PRODUCT(_max_depth = MAX2(_max_depth, _index)); | |
| 209 } | |
| 210 } | |
| 211 // Non-block impl. Note: concurrency is allowed only with other | |
| 212 // "par_push" operations, not with "pop" or "drain". We would need | |
| 213 // parallel versions of them if such concurrency was desired. | |
| 214 void par_push(oop ptr); | |
| 215 | |
| 216 // Pushes the first "n" elements of "ptr_arr" on the stack. | |
| 217 // Non-block impl. Note: concurrency is allowed only with other | |
| 218 // "par_adjoin_arr" or "push" operations, not with "pop" or "drain". | |
| 219 void par_adjoin_arr(oop* ptr_arr, int n); | |
| 220 | |
| 221 // Pushes the first "n" elements of "ptr_arr" on the stack. | |
| 222 // Locking impl: concurrency is allowed only with | |
| 223 // "par_push_arr" and/or "par_pop_arr" operations, which use the same | |
| 224 // locking strategy. | |
| 225 void par_push_arr(oop* ptr_arr, int n); | |
| 226 | |
| 227 // If returns false, the array was empty. Otherwise, removes up to "max" | |
| 228 // elements from the stack, and transfers them to "ptr_arr" in an | |
| 229 // unspecified order. The actual number transferred is given in "n" ("n | |
| 230 // == 0" is deliberately redundant with the return value.) Locking impl: | |
| 231 // concurrency is allowed only with "par_push_arr" and/or "par_pop_arr" | |
| 232 // operations, which use the same locking strategy. | |
| 233 bool par_pop_arr(oop* ptr_arr, int max, int* n); | |
| 234 | |
| 235 // Drain the mark stack, applying the given closure to all fields of | |
| 236 // objects on the stack. (That is, continue until the stack is empty, | |
| 237 // even if closure applications add entries to the stack.) The "bm" | |
| 238 // argument, if non-null, may be used to verify that only marked objects | |
| 239 // are on the mark stack. If "yield_after" is "true", then the | |
| 240 // concurrent marker performing the drain offers to yield after | |
| 241 // processing each object. If a yield occurs, stops the drain operation | |
| 242 // and returns false. Otherwise, returns true. | |
| 243 template<class OopClosureClass> | |
| 244 bool drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after = false); | |
| 245 | |
| 246 bool isEmpty() { return _index == 0; } | |
| 247 bool isFull() { return _index == _capacity; } | |
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248 int maxElems() { return _capacity; } |
| 342 | 249 |
| 250 bool overflow() { return _overflow; } | |
| 251 void clear_overflow() { _overflow = false; } | |
| 252 | |
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253 bool should_expand() const { return _should_expand; } |
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254 void set_should_expand(); |
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255 |
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256 // Expand the stack, typically in response to an overflow condition |
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257 void expand(); |
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258 |
| 342 | 259 int size() { return _index; } |
| 260 | |
| 261 void setEmpty() { _index = 0; clear_overflow(); } | |
| 262 | |
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263 // Record the current index. |
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264 void note_start_of_gc(); |
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265 |
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266 // Make sure that we have not added any entries to the stack during GC. |
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267 void note_end_of_gc(); |
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268 |
| 342 | 269 // iterate over the oops in the mark stack, up to the bound recorded via |
| 270 // the call above. | |
| 271 void oops_do(OopClosure* f); | |
| 272 }; | |
| 273 | |
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274 class ForceOverflowSettings VALUE_OBJ_CLASS_SPEC { |
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275 private: |
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276 #ifndef PRODUCT |
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277 uintx _num_remaining; |
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278 bool _force; |
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279 #endif // !defined(PRODUCT) |
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280 |
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281 public: |
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282 void init() PRODUCT_RETURN; |
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283 void update() PRODUCT_RETURN; |
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284 bool should_force() PRODUCT_RETURN_( return false; ); |
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285 }; |
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286 |
| 342 | 287 // this will enable a variety of different statistics per GC task |
| 288 #define _MARKING_STATS_ 0 | |
| 289 // this will enable the higher verbose levels | |
| 290 #define _MARKING_VERBOSE_ 0 | |
| 291 | |
| 292 #if _MARKING_STATS_ | |
| 293 #define statsOnly(statement) \ | |
| 294 do { \ | |
| 295 statement ; \ | |
| 296 } while (0) | |
| 297 #else // _MARKING_STATS_ | |
| 298 #define statsOnly(statement) \ | |
| 299 do { \ | |
| 300 } while (0) | |
| 301 #endif // _MARKING_STATS_ | |
| 302 | |
| 303 typedef enum { | |
| 304 no_verbose = 0, // verbose turned off | |
| 305 stats_verbose, // only prints stats at the end of marking | |
| 306 low_verbose, // low verbose, mostly per region and per major event | |
| 307 medium_verbose, // a bit more detailed than low | |
| 308 high_verbose // per object verbose | |
| 309 } CMVerboseLevel; | |
| 310 | |
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311 class YoungList; |
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312 |
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313 // Root Regions are regions that are not empty at the beginning of a |
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314 // marking cycle and which we might collect during an evacuation pause |
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315 // while the cycle is active. Given that, during evacuation pauses, we |
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316 // do not copy objects that are explicitly marked, what we have to do |
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317 // for the root regions is to scan them and mark all objects reachable |
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318 // from them. According to the SATB assumptions, we only need to visit |
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319 // each object once during marking. So, as long as we finish this scan |
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320 // before the next evacuation pause, we can copy the objects from the |
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321 // root regions without having to mark them or do anything else to them. |
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322 // |
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323 // Currently, we only support root region scanning once (at the start |
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324 // of the marking cycle) and the root regions are all the survivor |
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325 // regions populated during the initial-mark pause. |
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326 class CMRootRegions VALUE_OBJ_CLASS_SPEC { |
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327 private: |
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328 YoungList* _young_list; |
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329 ConcurrentMark* _cm; |
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330 |
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331 volatile bool _scan_in_progress; |
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332 volatile bool _should_abort; |
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333 HeapRegion* volatile _next_survivor; |
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334 |
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335 public: |
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336 CMRootRegions(); |
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337 // We actually do most of the initialization in this method. |
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338 void init(G1CollectedHeap* g1h, ConcurrentMark* cm); |
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339 |
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340 // Reset the claiming / scanning of the root regions. |
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341 void prepare_for_scan(); |
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342 |
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343 // Forces get_next() to return NULL so that the iteration aborts early. |
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344 void abort() { _should_abort = true; } |
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345 |
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346 // Return true if the CM thread are actively scanning root regions, |
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347 // false otherwise. |
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348 bool scan_in_progress() { return _scan_in_progress; } |
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349 |
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350 // Claim the next root region to scan atomically, or return NULL if |
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351 // all have been claimed. |
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352 HeapRegion* claim_next(); |
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353 |
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354 // Flag that we're done with root region scanning and notify anyone |
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355 // who's waiting on it. If aborted is false, assume that all regions |
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356 // have been claimed. |
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357 void scan_finished(); |
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358 |
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359 // If CM threads are still scanning root regions, wait until they |
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360 // are done. Return true if we had to wait, false otherwise. |
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361 bool wait_until_scan_finished(); |
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362 }; |
| 342 | 363 |
| 364 class ConcurrentMarkThread; | |
| 365 | |
| 6197 | 366 class ConcurrentMark: public CHeapObj<mtGC> { |
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367 friend class CMMarkStack; |
| 342 | 368 friend class ConcurrentMarkThread; |
| 369 friend class CMTask; | |
| 370 friend class CMBitMapClosure; | |
| 371 friend class CMGlobalObjectClosure; | |
| 372 friend class CMRemarkTask; | |
| 373 friend class CMConcurrentMarkingTask; | |
| 374 friend class G1ParNoteEndTask; | |
| 375 friend class CalcLiveObjectsClosure; | |
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376 friend class G1CMRefProcTaskProxy; |
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377 friend class G1CMRefProcTaskExecutor; |
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378 friend class G1CMKeepAliveAndDrainClosure; |
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379 friend class G1CMDrainMarkingStackClosure; |
| 342 | 380 |
| 381 protected: | |
| 382 ConcurrentMarkThread* _cmThread; // the thread doing the work | |
| 383 G1CollectedHeap* _g1h; // the heap. | |
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384 uint _parallel_marking_threads; // the number of marking |
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385 // threads we're use |
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386 uint _max_parallel_marking_threads; // max number of marking |
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387 // threads we'll ever use |
| 342 | 388 double _sleep_factor; // how much we have to sleep, with |
| 389 // respect to the work we just did, to | |
| 390 // meet the marking overhead goal | |
| 391 double _marking_task_overhead; // marking target overhead for | |
| 392 // a single task | |
| 393 | |
| 394 // same as the two above, but for the cleanup task | |
| 395 double _cleanup_sleep_factor; | |
| 396 double _cleanup_task_overhead; | |
| 397 | |
| 2152 | 398 FreeRegionList _cleanup_list; |
| 342 | 399 |
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400 // Concurrent marking support structures |
| 342 | 401 CMBitMap _markBitMap1; |
| 402 CMBitMap _markBitMap2; | |
| 403 CMBitMapRO* _prevMarkBitMap; // completed mark bitmap | |
| 404 CMBitMap* _nextMarkBitMap; // under-construction mark bitmap | |
| 405 | |
| 406 BitMap _region_bm; | |
| 407 BitMap _card_bm; | |
| 408 | |
| 409 // Heap bounds | |
| 410 HeapWord* _heap_start; | |
| 411 HeapWord* _heap_end; | |
| 412 | |
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413 // Root region tracking and claiming. |
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414 CMRootRegions _root_regions; |
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415 |
| 342 | 416 // For gray objects |
| 417 CMMarkStack _markStack; // Grey objects behind global finger. | |
| 418 HeapWord* volatile _finger; // the global finger, region aligned, | |
| 419 // always points to the end of the | |
| 420 // last claimed region | |
| 421 | |
| 422 // marking tasks | |
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423 uint _max_worker_id;// maximum worker id |
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424 uint _active_tasks; // task num currently active |
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425 CMTask** _tasks; // task queue array (max_worker_id len) |
| 342 | 426 CMTaskQueueSet* _task_queues; // task queue set |
| 427 ParallelTaskTerminator _terminator; // for termination | |
| 428 | |
| 429 // Two sync barriers that are used to synchronise tasks when an | |
| 430 // overflow occurs. The algorithm is the following. All tasks enter | |
| 431 // the first one to ensure that they have all stopped manipulating | |
| 432 // the global data structures. After they exit it, they re-initialise | |
| 433 // their data structures and task 0 re-initialises the global data | |
| 434 // structures. Then, they enter the second sync barrier. This | |
| 435 // ensure, that no task starts doing work before all data | |
| 436 // structures (local and global) have been re-initialised. When they | |
| 437 // exit it, they are free to start working again. | |
| 438 WorkGangBarrierSync _first_overflow_barrier_sync; | |
| 439 WorkGangBarrierSync _second_overflow_barrier_sync; | |
| 440 | |
| 441 // this is set by any task, when an overflow on the global data | |
| 442 // structures is detected. | |
| 443 volatile bool _has_overflown; | |
| 444 // true: marking is concurrent, false: we're in remark | |
| 445 volatile bool _concurrent; | |
| 446 // set at the end of a Full GC so that marking aborts | |
| 447 volatile bool _has_aborted; | |
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448 GCId _aborted_gc_id; |
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449 |
| 342 | 450 // used when remark aborts due to an overflow to indicate that |
| 451 // another concurrent marking phase should start | |
| 452 volatile bool _restart_for_overflow; | |
| 453 | |
| 454 // This is true from the very start of concurrent marking until the | |
| 455 // point when all the tasks complete their work. It is really used | |
| 456 // to determine the points between the end of concurrent marking and | |
| 457 // time of remark. | |
| 458 volatile bool _concurrent_marking_in_progress; | |
| 459 | |
| 460 // verbose level | |
| 461 CMVerboseLevel _verbose_level; | |
| 462 | |
| 463 // All of these times are in ms. | |
| 464 NumberSeq _init_times; | |
| 465 NumberSeq _remark_times; | |
| 466 NumberSeq _remark_mark_times; | |
| 467 NumberSeq _remark_weak_ref_times; | |
| 468 NumberSeq _cleanup_times; | |
| 469 double _total_counting_time; | |
| 470 double _total_rs_scrub_time; | |
| 471 | |
| 472 double* _accum_task_vtime; // accumulated task vtime | |
| 473 | |
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474 FlexibleWorkGang* _parallel_workers; |
| 342 | 475 |
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476 ForceOverflowSettings _force_overflow_conc; |
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477 ForceOverflowSettings _force_overflow_stw; |
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478 |
| 342 | 479 void weakRefsWork(bool clear_all_soft_refs); |
| 480 | |
| 481 void swapMarkBitMaps(); | |
| 482 | |
| 483 // It resets the global marking data structures, as well as the | |
| 484 // task local ones; should be called during initial mark. | |
| 485 void reset(); | |
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486 |
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487 // Resets all the marking data structures. Called when we have to restart |
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488 // marking or when marking completes (via set_non_marking_state below). |
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489 void reset_marking_state(bool clear_overflow = true); |
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490 |
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491 // We do this after we're done with marking so that the marking data |
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492 // structures are initialised to a sensible and predictable state. |
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493 void set_non_marking_state(); |
| 342 | 494 |
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495 // Called to indicate how many threads are currently active. |
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496 void set_concurrency(uint active_tasks); |
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497 |
| 342 | 498 // It should be called to indicate which phase we're in (concurrent |
| 499 // mark or remark) and how many threads are currently active. | |
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500 void set_concurrency_and_phase(uint active_tasks, bool concurrent); |
| 342 | 501 |
| 502 // prints all gathered CM-related statistics | |
| 503 void print_stats(); | |
| 504 | |
| 2152 | 505 bool cleanup_list_is_empty() { |
| 506 return _cleanup_list.is_empty(); | |
| 507 } | |
| 508 | |
| 342 | 509 // accessor methods |
|
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510 uint parallel_marking_threads() const { return _parallel_marking_threads; } |
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511 uint max_parallel_marking_threads() const { return _max_parallel_marking_threads;} |
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512 double sleep_factor() { return _sleep_factor; } |
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513 double marking_task_overhead() { return _marking_task_overhead;} |
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514 double cleanup_sleep_factor() { return _cleanup_sleep_factor; } |
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515 double cleanup_task_overhead() { return _cleanup_task_overhead;} |
| 342 | 516 |
|
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517 bool use_parallel_marking_threads() const { |
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518 assert(parallel_marking_threads() <= |
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519 max_parallel_marking_threads(), "sanity"); |
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520 assert((_parallel_workers == NULL && parallel_marking_threads() == 0) || |
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521 parallel_marking_threads() > 0, |
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522 "parallel workers not set up correctly"); |
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523 return _parallel_workers != NULL; |
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524 } |
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525 |
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526 HeapWord* finger() { return _finger; } |
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527 bool concurrent() { return _concurrent; } |
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528 uint active_tasks() { return _active_tasks; } |
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529 ParallelTaskTerminator* terminator() { return &_terminator; } |
| 342 | 530 |
| 531 // It claims the next available region to be scanned by a marking | |
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532 // task/thread. It might return NULL if the next region is empty or |
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533 // we have run out of regions. In the latter case, out_of_regions() |
| 342 | 534 // determines whether we've really run out of regions or the task |
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535 // should call claim_region() again. This might seem a bit |
| 342 | 536 // awkward. Originally, the code was written so that claim_region() |
| 537 // either successfully returned with a non-empty region or there | |
| 538 // were no more regions to be claimed. The problem with this was | |
| 539 // that, in certain circumstances, it iterated over large chunks of | |
| 540 // the heap finding only empty regions and, while it was working, it | |
| 541 // was preventing the calling task to call its regular clock | |
| 542 // method. So, this way, each task will spend very little time in | |
| 543 // claim_region() and is allowed to call the regular clock method | |
| 544 // frequently. | |
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545 HeapRegion* claim_region(uint worker_id); |
| 342 | 546 |
|
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547 // It determines whether we've run out of regions to scan. Note that |
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548 // the finger can point past the heap end in case the heap was expanded |
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549 // to satisfy an allocation without doing a GC. This is fine, because all |
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550 // objects in those regions will be considered live anyway because of |
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551 // SATB guarantees (i.e. their TAMS will be equal to bottom). |
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552 bool out_of_regions() { return _finger >= _heap_end; } |
| 342 | 553 |
| 554 // Returns the task with the given id | |
| 555 CMTask* task(int id) { | |
|
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556 assert(0 <= id && id < (int) _active_tasks, |
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557 "task id not within active bounds"); |
| 342 | 558 return _tasks[id]; |
| 559 } | |
| 560 | |
| 561 // Returns the task queue with the given id | |
| 562 CMTaskQueue* task_queue(int id) { | |
|
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563 assert(0 <= id && id < (int) _active_tasks, |
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564 "task queue id not within active bounds"); |
| 342 | 565 return (CMTaskQueue*) _task_queues->queue(id); |
| 566 } | |
| 567 | |
| 568 // Returns the task queue set | |
| 569 CMTaskQueueSet* task_queues() { return _task_queues; } | |
| 570 | |
| 571 // Access / manipulation of the overflow flag which is set to | |
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572 // indicate that the global stack has overflown |
| 342 | 573 bool has_overflown() { return _has_overflown; } |
| 574 void set_has_overflown() { _has_overflown = true; } | |
| 575 void clear_has_overflown() { _has_overflown = false; } | |
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576 bool restart_for_overflow() { return _restart_for_overflow; } |
| 342 | 577 |
| 578 // Methods to enter the two overflow sync barriers | |
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579 void enter_first_sync_barrier(uint worker_id); |
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580 void enter_second_sync_barrier(uint worker_id); |
| 342 | 581 |
|
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582 ForceOverflowSettings* force_overflow_conc() { |
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583 return &_force_overflow_conc; |
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584 } |
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585 |
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586 ForceOverflowSettings* force_overflow_stw() { |
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587 return &_force_overflow_stw; |
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588 } |
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589 |
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590 ForceOverflowSettings* force_overflow() { |
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591 if (concurrent()) { |
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592 return force_overflow_conc(); |
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593 } else { |
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594 return force_overflow_stw(); |
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595 } |
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596 } |
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597 |
|
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598 // Live Data Counting data structures... |
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599 // These data structures are initialized at the start of |
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600 // marking. They are written to while marking is active. |
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601 // They are aggregated during remark; the aggregated values |
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602 // are then used to populate the _region_bm, _card_bm, and |
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603 // the total live bytes, which are then subsequently updated |
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604 // during cleanup. |
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605 |
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606 // An array of bitmaps (one bit map per task). Each bitmap |
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607 // is used to record the cards spanned by the live objects |
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608 // marked by that task/worker. |
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609 BitMap* _count_card_bitmaps; |
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610 |
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611 // Used to record the number of marked live bytes |
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612 // (for each region, by worker thread). |
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613 size_t** _count_marked_bytes; |
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614 |
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615 // Card index of the bottom of the G1 heap. Used for biasing indices into |
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616 // the card bitmaps. |
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617 intptr_t _heap_bottom_card_num; |
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618 |
|
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619 // Set to true when initialization is complete |
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620 bool _completed_initialization; |
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621 |
| 342 | 622 public: |
| 623 // Manipulation of the global mark stack. | |
| 624 // Notice that the first mark_stack_push is CAS-based, whereas the | |
| 625 // two below are Mutex-based. This is OK since the first one is only | |
| 626 // called during evacuation pauses and doesn't compete with the | |
| 627 // other two (which are called by the marking tasks during | |
| 628 // concurrent marking or remark). | |
| 629 bool mark_stack_push(oop p) { | |
| 630 _markStack.par_push(p); | |
| 631 if (_markStack.overflow()) { | |
| 632 set_has_overflown(); | |
| 633 return false; | |
| 634 } | |
| 635 return true; | |
| 636 } | |
| 637 bool mark_stack_push(oop* arr, int n) { | |
| 638 _markStack.par_push_arr(arr, n); | |
| 639 if (_markStack.overflow()) { | |
| 640 set_has_overflown(); | |
| 641 return false; | |
| 642 } | |
| 643 return true; | |
| 644 } | |
| 645 void mark_stack_pop(oop* arr, int max, int* n) { | |
| 646 _markStack.par_pop_arr(arr, max, n); | |
| 647 } | |
|
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648 size_t mark_stack_size() { return _markStack.size(); } |
| 342 | 649 size_t partial_mark_stack_size_target() { return _markStack.maxElems()/3; } |
|
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650 bool mark_stack_overflow() { return _markStack.overflow(); } |
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651 bool mark_stack_empty() { return _markStack.isEmpty(); } |
| 342 | 652 |
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653 CMRootRegions* root_regions() { return &_root_regions; } |
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654 |
| 342 | 655 bool concurrent_marking_in_progress() { |
| 656 return _concurrent_marking_in_progress; | |
| 657 } | |
| 658 void set_concurrent_marking_in_progress() { | |
| 659 _concurrent_marking_in_progress = true; | |
| 660 } | |
| 661 void clear_concurrent_marking_in_progress() { | |
| 662 _concurrent_marking_in_progress = false; | |
| 663 } | |
| 664 | |
| 665 void update_accum_task_vtime(int i, double vtime) { | |
| 666 _accum_task_vtime[i] += vtime; | |
| 667 } | |
| 668 | |
| 669 double all_task_accum_vtime() { | |
| 670 double ret = 0.0; | |
|
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671 for (uint i = 0; i < _max_worker_id; ++i) |
| 342 | 672 ret += _accum_task_vtime[i]; |
| 673 return ret; | |
| 674 } | |
| 675 | |
| 676 // Attempts to steal an object from the task queues of other tasks | |
|
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677 bool try_stealing(uint worker_id, int* hash_seed, oop& obj) { |
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678 return _task_queues->steal(worker_id, hash_seed, obj); |
| 342 | 679 } |
| 680 | |
|
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681 ConcurrentMark(G1CollectedHeap* g1h, ReservedSpace heap_rs); |
| 342 | 682 ~ConcurrentMark(); |
|
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683 |
| 342 | 684 ConcurrentMarkThread* cmThread() { return _cmThread; } |
| 685 | |
| 686 CMBitMapRO* prevMarkBitMap() const { return _prevMarkBitMap; } | |
| 687 CMBitMap* nextMarkBitMap() const { return _nextMarkBitMap; } | |
| 688 | |
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689 // Returns the number of GC threads to be used in a concurrent |
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690 // phase based on the number of GC threads being used in a STW |
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691 // phase. |
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692 uint scale_parallel_threads(uint n_par_threads); |
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693 |
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694 // Calculates the number of GC threads to be used in a concurrent phase. |
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695 uint calc_parallel_marking_threads(); |
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696 |
| 342 | 697 // The following three are interaction between CM and |
| 698 // G1CollectedHeap | |
| 699 | |
| 700 // This notifies CM that a root during initial-mark needs to be | |
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701 // grayed. It is MT-safe. word_size is the size of the object in |
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702 // words. It is passed explicitly as sometimes we cannot calculate |
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703 // it from the given object because it might be in an inconsistent |
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704 // state (e.g., in to-space and being copied). So the caller is |
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705 // responsible for dealing with this issue (e.g., get the size from |
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706 // the from-space image when the to-space image might be |
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707 // inconsistent) and always passing the size. hr is the region that |
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708 // contains the object and it's passed optionally from callers who |
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709 // might already have it (no point in recalculating it). |
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710 inline void grayRoot(oop obj, size_t word_size, |
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711 uint worker_id, HeapRegion* hr = NULL); |
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712 |
| 1388 | 713 // It iterates over the heap and for each object it comes across it |
| 714 // will dump the contents of its reference fields, as well as | |
| 715 // liveness information for the object and its referents. The dump | |
| 716 // will be written to a file with the following name: | |
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717 // G1PrintReachableBaseFile + "." + str. |
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718 // vo decides whether the prev (vo == UsePrevMarking), the next |
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719 // (vo == UseNextMarking) marking information, or the mark word |
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720 // (vo == UseMarkWord) will be used to determine the liveness of |
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721 // each object / referent. |
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722 // If all is true, all objects in the heap will be dumped, otherwise |
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723 // only the live ones. In the dump the following symbols / breviations |
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724 // are used: |
| 1388 | 725 // M : an explicitly live object (its bitmap bit is set) |
| 726 // > : an implicitly live object (over tams) | |
| 727 // O : an object outside the G1 heap (typically: in the perm gen) | |
| 728 // NOT : a reference field whose referent is not live | |
| 729 // AND MARKED : indicates that an object is both explicitly and | |
| 730 // implicitly live (it should be one or the other, not both) | |
| 731 void print_reachable(const char* str, | |
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732 VerifyOption vo, bool all) PRODUCT_RETURN; |
| 342 | 733 |
| 734 // Clear the next marking bitmap (will be called concurrently). | |
| 735 void clearNextBitmap(); | |
| 736 | |
| 737 // These two do the work that needs to be done before and after the | |
| 738 // initial root checkpoint. Since this checkpoint can be done at two | |
| 739 // different points (i.e. an explicit pause or piggy-backed on a | |
| 740 // young collection), then it's nice to be able to easily share the | |
| 741 // pre/post code. It might be the case that we can put everything in | |
| 742 // the post method. TP | |
| 743 void checkpointRootsInitialPre(); | |
| 744 void checkpointRootsInitialPost(); | |
| 745 | |
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746 // Scan all the root regions and mark everything reachable from |
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747 // them. |
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748 void scanRootRegions(); |
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749 |
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|
750 // Scan a single root region and mark everything reachable from it. |
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751 void scanRootRegion(HeapRegion* hr, uint worker_id); |
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752 |
| 342 | 753 // Do concurrent phase of marking, to a tentative transitive closure. |
| 754 void markFromRoots(); | |
| 755 | |
| 756 void checkpointRootsFinal(bool clear_all_soft_refs); | |
| 757 void checkpointRootsFinalWork(); | |
| 758 void cleanup(); | |
| 759 void completeCleanup(); | |
| 760 | |
| 761 // Mark in the previous bitmap. NB: this is usually read-only, so use | |
| 762 // this carefully! | |
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763 inline void markPrev(oop p); |
|
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764 |
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765 // Clears marks for all objects in the given range, for the prev, |
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766 // next, or both bitmaps. NB: the previous bitmap is usually |
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767 // read-only, so use this carefully! |
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768 void clearRangePrevBitmap(MemRegion mr); |
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769 void clearRangeNextBitmap(MemRegion mr); |
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770 void clearRangeBothBitmaps(MemRegion mr); |
| 342 | 771 |
|
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772 // Notify data structures that a GC has started. |
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773 void note_start_of_gc() { |
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774 _markStack.note_start_of_gc(); |
| 342 | 775 } |
|
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776 |
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777 // Notify data structures that a GC is finished. |
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778 void note_end_of_gc() { |
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779 _markStack.note_end_of_gc(); |
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780 } |
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781 |
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782 // Verify that there are no CSet oops on the stacks (taskqueues / |
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783 // global mark stack), enqueued SATB buffers, per-thread SATB |
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784 // buffers, and fingers (global / per-task). The boolean parameters |
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785 // decide which of the above data structures to verify. If marking |
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786 // is not in progress, it's a no-op. |
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787 void verify_no_cset_oops(bool verify_stacks, |
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788 bool verify_enqueued_buffers, |
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789 bool verify_thread_buffers, |
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790 bool verify_fingers) PRODUCT_RETURN; |
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791 |
| 342 | 792 // It is called at the end of an evacuation pause during marking so |
| 793 // that CM is notified of where the new end of the heap is. It | |
| 794 // doesn't do anything if concurrent_marking_in_progress() is false, | |
| 795 // unless the force parameter is true. | |
| 796 void update_g1_committed(bool force = false); | |
| 797 | |
| 798 bool isMarked(oop p) const { | |
| 799 assert(p != NULL && p->is_oop(), "expected an oop"); | |
| 800 HeapWord* addr = (HeapWord*)p; | |
| 801 assert(addr >= _nextMarkBitMap->startWord() || | |
| 802 addr < _nextMarkBitMap->endWord(), "in a region"); | |
| 803 | |
| 804 return _nextMarkBitMap->isMarked(addr); | |
| 805 } | |
| 806 | |
| 807 inline bool not_yet_marked(oop p) const; | |
| 808 | |
| 809 // XXX Debug code | |
| 810 bool containing_card_is_marked(void* p); | |
| 811 bool containing_cards_are_marked(void* start, void* last); | |
| 812 | |
| 813 bool isPrevMarked(oop p) const { | |
| 814 assert(p != NULL && p->is_oop(), "expected an oop"); | |
| 815 HeapWord* addr = (HeapWord*)p; | |
| 816 assert(addr >= _prevMarkBitMap->startWord() || | |
| 817 addr < _prevMarkBitMap->endWord(), "in a region"); | |
| 818 | |
| 819 return _prevMarkBitMap->isMarked(addr); | |
| 820 } | |
| 821 | |
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822 inline bool do_yield_check(uint worker_i = 0); |
| 342 | 823 inline bool should_yield(); |
| 824 | |
| 825 // Called to abort the marking cycle after a Full GC takes palce. | |
| 826 void abort(); | |
| 827 | |
| 10405 | 828 bool has_aborted() { return _has_aborted; } |
| 829 | |
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830 const GCId& concurrent_gc_id(); |
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831 |
| 342 | 832 // This prints the global/local fingers. It is used for debugging. |
| 833 NOT_PRODUCT(void print_finger();) | |
| 834 | |
| 835 void print_summary_info(); | |
| 836 | |
| 1019 | 837 void print_worker_threads_on(outputStream* st) const; |
| 838 | |
|
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839 void print_on_error(outputStream* st) const; |
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840 |
| 342 | 841 // The following indicate whether a given verbose level has been |
| 842 // set. Notice that anything above stats is conditional to | |
| 843 // _MARKING_VERBOSE_ having been set to 1 | |
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844 bool verbose_stats() { |
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845 return _verbose_level >= stats_verbose; |
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846 } |
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847 bool verbose_low() { |
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848 return _MARKING_VERBOSE_ && _verbose_level >= low_verbose; |
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849 } |
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850 bool verbose_medium() { |
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851 return _MARKING_VERBOSE_ && _verbose_level >= medium_verbose; |
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852 } |
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853 bool verbose_high() { |
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854 return _MARKING_VERBOSE_ && _verbose_level >= high_verbose; |
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855 } |
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856 |
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857 // Liveness counting |
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858 |
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859 // Utility routine to set an exclusive range of cards on the given |
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860 // card liveness bitmap |
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861 inline void set_card_bitmap_range(BitMap* card_bm, |
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862 BitMap::idx_t start_idx, |
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863 BitMap::idx_t end_idx, |
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864 bool is_par); |
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865 |
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866 // Returns the card number of the bottom of the G1 heap. |
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867 // Used in biasing indices into accounting card bitmaps. |
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868 intptr_t heap_bottom_card_num() const { |
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869 return _heap_bottom_card_num; |
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870 } |
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871 |
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872 // Returns the card bitmap for a given task or worker id. |
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873 BitMap* count_card_bitmap_for(uint worker_id) { |
|
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874 assert(0 <= worker_id && worker_id < _max_worker_id, "oob"); |
|
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875 assert(_count_card_bitmaps != NULL, "uninitialized"); |
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876 BitMap* task_card_bm = &_count_card_bitmaps[worker_id]; |
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877 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
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878 return task_card_bm; |
|
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|
879 } |
|
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880 |
|
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881 // Returns the array containing the marked bytes for each region, |
|
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882 // for the given worker or task id. |
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883 size_t* count_marked_bytes_array_for(uint worker_id) { |
|
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884 assert(0 <= worker_id && worker_id < _max_worker_id, "oob"); |
|
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885 assert(_count_marked_bytes != NULL, "uninitialized"); |
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886 size_t* marked_bytes_array = _count_marked_bytes[worker_id]; |
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887 assert(marked_bytes_array != NULL, "uninitialized"); |
|
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888 return marked_bytes_array; |
|
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|
889 } |
|
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|
890 |
|
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|
891 // Returns the index in the liveness accounting card table bitmap |
|
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892 // for the given address |
|
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|
893 inline BitMap::idx_t card_bitmap_index_for(HeapWord* addr); |
|
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894 |
|
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|
895 // Counts the size of the given memory region in the the given |
|
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896 // marked_bytes array slot for the given HeapRegion. |
|
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897 // Sets the bits in the given card bitmap that are associated with the |
|
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898 // cards that are spanned by the memory region. |
|
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899 inline void count_region(MemRegion mr, HeapRegion* hr, |
|
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900 size_t* marked_bytes_array, |
|
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901 BitMap* task_card_bm); |
|
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|
902 |
|
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|
903 // Counts the given memory region in the task/worker counting |
|
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|
904 // data structures for the given worker id. |
|
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905 inline void count_region(MemRegion mr, HeapRegion* hr, uint worker_id); |
|
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906 |
|
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|
907 // Counts the given memory region in the task/worker counting |
|
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908 // data structures for the given worker id. |
|
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909 inline void count_region(MemRegion mr, uint worker_id); |
|
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|
910 |
|
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|
911 // Counts the given object in the given task/worker counting |
|
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912 // data structures. |
|
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913 inline void count_object(oop obj, HeapRegion* hr, |
|
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914 size_t* marked_bytes_array, |
|
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915 BitMap* task_card_bm); |
|
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|
916 |
|
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|
917 // Counts the given object in the task/worker counting data |
|
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918 // structures for the given worker id. |
|
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|
919 inline void count_object(oop obj, HeapRegion* hr, uint worker_id); |
|
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|
920 |
|
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|
921 // Attempts to mark the given object and, if successful, counts |
|
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922 // the object in the given task/worker counting structures. |
|
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923 inline bool par_mark_and_count(oop obj, HeapRegion* hr, |
|
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924 size_t* marked_bytes_array, |
|
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|
925 BitMap* task_card_bm); |
|
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|
926 |
|
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|
927 // Attempts to mark the given object and, if successful, counts |
|
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928 // the object in the task/worker counting structures for the |
|
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929 // given worker id. |
|
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930 inline bool par_mark_and_count(oop obj, size_t word_size, |
|
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931 HeapRegion* hr, uint worker_id); |
|
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|
932 |
|
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|
933 // Attempts to mark the given object and, if successful, counts |
|
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934 // the object in the task/worker counting structures for the |
|
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|
935 // given worker id. |
|
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|
936 inline bool par_mark_and_count(oop obj, HeapRegion* hr, uint worker_id); |
|
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|
937 |
|
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|
938 // Similar to the above routine but we don't know the heap region that |
|
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939 // contains the object to be marked/counted, which this routine looks up. |
|
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940 inline bool par_mark_and_count(oop obj, uint worker_id); |
|
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|
941 |
|
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|
942 // Similar to the above routine but there are times when we cannot |
|
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|
943 // safely calculate the size of obj due to races and we, therefore, |
|
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|
944 // pass the size in as a parameter. It is the caller's reponsibility |
|
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|
945 // to ensure that the size passed in for obj is valid. |
|
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946 inline bool par_mark_and_count(oop obj, size_t word_size, uint worker_id); |
|
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|
947 |
|
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|
948 // Unconditionally mark the given object, and unconditinally count |
|
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|
949 // the object in the counting structures for worker id 0. |
|
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|
950 // Should *not* be called from parallel code. |
|
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|
951 inline bool mark_and_count(oop obj, HeapRegion* hr); |
|
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|
952 |
|
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|
953 // Similar to the above routine but we don't know the heap region that |
|
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|
954 // contains the object to be marked/counted, which this routine looks up. |
|
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|
955 // Should *not* be called from parallel code. |
|
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|
956 inline bool mark_and_count(oop obj); |
|
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|
957 |
|
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|
958 // Returns true if initialization was successfully completed. |
|
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959 bool completed_initialization() const { |
|
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|
960 return _completed_initialization; |
|
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|
961 } |
|
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|
962 |
|
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|
963 protected: |
|
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|
964 // Clear all the per-task bitmaps and arrays used to store the |
|
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|
965 // counting data. |
|
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|
966 void clear_all_count_data(); |
|
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|
967 |
|
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|
968 // Aggregates the counting data for each worker/task |
|
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|
969 // that was constructed while marking. Also sets |
|
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|
970 // the amount of marked bytes for each region and |
|
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|
971 // the top at concurrent mark count. |
|
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|
972 void aggregate_count_data(); |
|
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|
973 |
|
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|
974 // Verification routine |
|
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|
975 void verify_count_data(); |
| 342 | 976 }; |
| 977 | |
| 978 // A class representing a marking task. | |
| 979 class CMTask : public TerminatorTerminator { | |
| 980 private: | |
| 981 enum PrivateConstants { | |
| 982 // the regular clock call is called once the scanned words reaches | |
| 983 // this limit | |
| 984 words_scanned_period = 12*1024, | |
| 985 // the regular clock call is called once the number of visited | |
| 986 // references reaches this limit | |
| 987 refs_reached_period = 384, | |
| 988 // initial value for the hash seed, used in the work stealing code | |
| 989 init_hash_seed = 17, | |
| 990 // how many entries will be transferred between global stack and | |
| 991 // local queues | |
| 992 global_stack_transfer_size = 16 | |
| 993 }; | |
| 994 | |
|
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995 uint _worker_id; |
| 342 | 996 G1CollectedHeap* _g1h; |
| 997 ConcurrentMark* _cm; | |
| 998 CMBitMap* _nextMarkBitMap; | |
| 999 // the task queue of this task | |
| 1000 CMTaskQueue* _task_queue; | |
|
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1001 private: |
| 342 | 1002 // the task queue set---needed for stealing |
| 1003 CMTaskQueueSet* _task_queues; | |
| 1004 // indicates whether the task has been claimed---this is only for | |
| 1005 // debugging purposes | |
| 1006 bool _claimed; | |
| 1007 | |
| 1008 // number of calls to this task | |
| 1009 int _calls; | |
| 1010 | |
| 1011 // when the virtual timer reaches this time, the marking step should | |
| 1012 // exit | |
| 1013 double _time_target_ms; | |
| 1014 // the start time of the current marking step | |
| 1015 double _start_time_ms; | |
| 1016 | |
| 1017 // the oop closure used for iterations over oops | |
| 3771 | 1018 G1CMOopClosure* _cm_oop_closure; |
| 342 | 1019 |
| 1020 // the region this task is scanning, NULL if we're not scanning any | |
| 1021 HeapRegion* _curr_region; | |
| 1022 // the local finger of this task, NULL if we're not scanning a region | |
| 1023 HeapWord* _finger; | |
| 1024 // limit of the region this task is scanning, NULL if we're not scanning one | |
| 1025 HeapWord* _region_limit; | |
| 1026 | |
| 1027 // the number of words this task has scanned | |
| 1028 size_t _words_scanned; | |
| 1029 // When _words_scanned reaches this limit, the regular clock is | |
| 1030 // called. Notice that this might be decreased under certain | |
| 1031 // circumstances (i.e. when we believe that we did an expensive | |
| 1032 // operation). | |
| 1033 size_t _words_scanned_limit; | |
| 1034 // the initial value of _words_scanned_limit (i.e. what it was | |
| 1035 // before it was decreased). | |
| 1036 size_t _real_words_scanned_limit; | |
| 1037 | |
| 1038 // the number of references this task has visited | |
| 1039 size_t _refs_reached; | |
| 1040 // When _refs_reached reaches this limit, the regular clock is | |
| 1041 // called. Notice this this might be decreased under certain | |
| 1042 // circumstances (i.e. when we believe that we did an expensive | |
| 1043 // operation). | |
| 1044 size_t _refs_reached_limit; | |
| 1045 // the initial value of _refs_reached_limit (i.e. what it was before | |
| 1046 // it was decreased). | |
| 1047 size_t _real_refs_reached_limit; | |
| 1048 | |
| 1049 // used by the work stealing stuff | |
| 1050 int _hash_seed; | |
| 1051 // if this is true, then the task has aborted for some reason | |
| 1052 bool _has_aborted; | |
| 1053 // set when the task aborts because it has met its time quota | |
|
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1054 bool _has_timed_out; |
| 342 | 1055 // true when we're draining SATB buffers; this avoids the task |
| 1056 // aborting due to SATB buffers being available (as we're already | |
| 1057 // dealing with them) | |
| 1058 bool _draining_satb_buffers; | |
| 1059 | |
| 1060 // number sequence of past step times | |
| 1061 NumberSeq _step_times_ms; | |
| 1062 // elapsed time of this task | |
| 1063 double _elapsed_time_ms; | |
| 1064 // termination time of this task | |
| 1065 double _termination_time_ms; | |
| 1066 // when this task got into the termination protocol | |
| 1067 double _termination_start_time_ms; | |
| 1068 | |
| 1069 // true when the task is during a concurrent phase, false when it is | |
| 1070 // in the remark phase (so, in the latter case, we do not have to | |
| 1071 // check all the things that we have to check during the concurrent | |
| 1072 // phase, i.e. SATB buffer availability...) | |
| 1073 bool _concurrent; | |
| 1074 | |
| 1075 TruncatedSeq _marking_step_diffs_ms; | |
| 1076 | |
|
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1077 // Counting data structures. Embedding the task's marked_bytes_array |
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1078 // and card bitmap into the actual task saves having to go through |
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1079 // the ConcurrentMark object. |
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1080 size_t* _marked_bytes_array; |
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1081 BitMap* _card_bm; |
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1082 |
| 342 | 1083 // LOTS of statistics related with this task |
| 1084 #if _MARKING_STATS_ | |
| 1085 NumberSeq _all_clock_intervals_ms; | |
| 1086 double _interval_start_time_ms; | |
| 1087 | |
| 1088 int _aborted; | |
| 1089 int _aborted_overflow; | |
| 1090 int _aborted_cm_aborted; | |
| 1091 int _aborted_yield; | |
| 1092 int _aborted_timed_out; | |
| 1093 int _aborted_satb; | |
| 1094 int _aborted_termination; | |
| 1095 | |
| 1096 int _steal_attempts; | |
| 1097 int _steals; | |
| 1098 | |
| 1099 int _clock_due_to_marking; | |
| 1100 int _clock_due_to_scanning; | |
| 1101 | |
| 1102 int _local_pushes; | |
| 1103 int _local_pops; | |
| 1104 int _local_max_size; | |
| 1105 int _objs_scanned; | |
| 1106 | |
| 1107 int _global_pushes; | |
| 1108 int _global_pops; | |
| 1109 int _global_max_size; | |
| 1110 | |
| 1111 int _global_transfers_to; | |
| 1112 int _global_transfers_from; | |
| 1113 | |
| 1114 int _regions_claimed; | |
| 1115 int _objs_found_on_bitmap; | |
| 1116 | |
| 1117 int _satb_buffers_processed; | |
| 1118 #endif // _MARKING_STATS_ | |
| 1119 | |
| 1120 // it updates the local fields after this task has claimed | |
| 1121 // a new region to scan | |
| 1122 void setup_for_region(HeapRegion* hr); | |
| 1123 // it brings up-to-date the limit of the region | |
| 1124 void update_region_limit(); | |
| 1125 | |
| 1126 // called when either the words scanned or the refs visited limit | |
| 1127 // has been reached | |
| 1128 void reached_limit(); | |
| 1129 // recalculates the words scanned and refs visited limits | |
| 1130 void recalculate_limits(); | |
| 1131 // decreases the words scanned and refs visited limits when we reach | |
| 1132 // an expensive operation | |
| 1133 void decrease_limits(); | |
| 1134 // it checks whether the words scanned or refs visited reached their | |
| 1135 // respective limit and calls reached_limit() if they have | |
| 1136 void check_limits() { | |
| 1137 if (_words_scanned >= _words_scanned_limit || | |
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1138 _refs_reached >= _refs_reached_limit) { |
| 342 | 1139 reached_limit(); |
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1140 } |
| 342 | 1141 } |
| 1142 // this is supposed to be called regularly during a marking step as | |
| 1143 // it checks a bunch of conditions that might cause the marking step | |
| 1144 // to abort | |
| 1145 void regular_clock_call(); | |
| 1146 bool concurrent() { return _concurrent; } | |
| 1147 | |
| 1148 public: | |
| 1149 // It resets the task; it should be called right at the beginning of | |
| 1150 // a marking phase. | |
| 1151 void reset(CMBitMap* _nextMarkBitMap); | |
| 1152 // it clears all the fields that correspond to a claimed region. | |
| 1153 void clear_region_fields(); | |
| 1154 | |
| 1155 void set_concurrent(bool concurrent) { _concurrent = concurrent; } | |
| 1156 | |
| 1157 // The main method of this class which performs a marking step | |
| 1158 // trying not to exceed the given duration. However, it might exit | |
| 1159 // prematurely, according to some conditions (i.e. SATB buffers are | |
| 1160 // available for processing). | |
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1161 void do_marking_step(double target_ms, |
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1162 bool do_termination, |
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1163 bool is_serial); |
| 342 | 1164 |
| 1165 // These two calls start and stop the timer | |
| 1166 void record_start_time() { | |
| 1167 _elapsed_time_ms = os::elapsedTime() * 1000.0; | |
| 1168 } | |
| 1169 void record_end_time() { | |
| 1170 _elapsed_time_ms = os::elapsedTime() * 1000.0 - _elapsed_time_ms; | |
| 1171 } | |
| 1172 | |
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1173 // returns the worker ID associated with this task. |
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1174 uint worker_id() { return _worker_id; } |
| 342 | 1175 |
| 1176 // From TerminatorTerminator. It determines whether this task should | |
| 1177 // exit the termination protocol after it's entered it. | |
| 1178 virtual bool should_exit_termination(); | |
| 1179 | |
|
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1180 // Resets the local region fields after a task has finished scanning a |
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1181 // region; or when they have become stale as a result of the region |
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1182 // being evacuated. |
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1183 void giveup_current_region(); |
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1184 |
| 342 | 1185 HeapWord* finger() { return _finger; } |
| 1186 | |
| 1187 bool has_aborted() { return _has_aborted; } | |
| 1188 void set_has_aborted() { _has_aborted = true; } | |
| 1189 void clear_has_aborted() { _has_aborted = false; } | |
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1190 bool has_timed_out() { return _has_timed_out; } |
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1191 bool claimed() { return _claimed; } |
| 342 | 1192 |
| 3771 | 1193 void set_cm_oop_closure(G1CMOopClosure* cm_oop_closure); |
| 342 | 1194 |
| 1195 // It grays the object by marking it and, if necessary, pushing it | |
| 1196 // on the local queue | |
| 3771 | 1197 inline void deal_with_reference(oop obj); |
| 342 | 1198 |
| 1199 // It scans an object and visits its children. | |
| 3771 | 1200 void scan_object(oop obj); |
| 342 | 1201 |
| 1202 // It pushes an object on the local queue. | |
| 3771 | 1203 inline void push(oop obj); |
| 342 | 1204 |
| 1205 // These two move entries to/from the global stack. | |
| 1206 void move_entries_to_global_stack(); | |
| 1207 void get_entries_from_global_stack(); | |
| 1208 | |
| 1209 // It pops and scans objects from the local queue. If partially is | |
| 1210 // true, then it stops when the queue size is of a given limit. If | |
| 1211 // partially is false, then it stops when the queue is empty. | |
| 1212 void drain_local_queue(bool partially); | |
| 1213 // It moves entries from the global stack to the local queue and | |
| 1214 // drains the local queue. If partially is true, then it stops when | |
| 1215 // both the global stack and the local queue reach a given size. If | |
| 1216 // partially if false, it tries to empty them totally. | |
| 1217 void drain_global_stack(bool partially); | |
| 1218 // It keeps picking SATB buffers and processing them until no SATB | |
| 1219 // buffers are available. | |
| 1220 void drain_satb_buffers(); | |
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1221 |
| 342 | 1222 // moves the local finger to a new location |
| 1223 inline void move_finger_to(HeapWord* new_finger) { | |
|
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1224 assert(new_finger >= _finger && new_finger < _region_limit, "invariant"); |
| 342 | 1225 _finger = new_finger; |
| 1226 } | |
| 1227 | |
|
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1228 CMTask(uint worker_id, ConcurrentMark *cm, |
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1229 size_t* marked_bytes, BitMap* card_bm, |
| 342 | 1230 CMTaskQueue* task_queue, CMTaskQueueSet* task_queues); |
| 1231 | |
| 1232 // it prints statistics associated with this task | |
| 1233 void print_stats(); | |
| 1234 | |
| 1235 #if _MARKING_STATS_ | |
| 1236 void increase_objs_found_on_bitmap() { ++_objs_found_on_bitmap; } | |
| 1237 #endif // _MARKING_STATS_ | |
| 1238 }; | |
| 1972 | 1239 |
|
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1240 // Class that's used to to print out per-region liveness |
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1241 // information. It's currently used at the end of marking and also |
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1242 // after we sort the old regions at the end of the cleanup operation. |
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1243 class G1PrintRegionLivenessInfoClosure: public HeapRegionClosure { |
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1244 private: |
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1245 outputStream* _out; |
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1246 |
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1247 // Accumulators for these values. |
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1248 size_t _total_used_bytes; |
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1249 size_t _total_capacity_bytes; |
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1250 size_t _total_prev_live_bytes; |
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1251 size_t _total_next_live_bytes; |
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1252 |
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|
1253 // These are set up when we come across a "stars humongous" region |
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1254 // (as this is where most of this information is stored, not in the |
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1255 // subsequent "continues humongous" regions). After that, for every |
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1256 // region in a given humongous region series we deduce the right |
|
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1257 // values for it by simply subtracting the appropriate amount from |
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1258 // these fields. All these values should reach 0 after we've visited |
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1259 // the last region in the series. |
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1260 size_t _hum_used_bytes; |
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1261 size_t _hum_capacity_bytes; |
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1262 size_t _hum_prev_live_bytes; |
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1263 size_t _hum_next_live_bytes; |
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1264 |
|
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1265 // Accumulator for the remembered set size |
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1266 size_t _total_remset_bytes; |
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1267 |
| 12080 | 1268 // Accumulator for strong code roots memory size |
| 1269 size_t _total_strong_code_roots_bytes; | |
| 1270 | |
|
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1271 static double perc(size_t val, size_t total) { |
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1272 if (total == 0) { |
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1273 return 0.0; |
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1274 } else { |
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1275 return 100.0 * ((double) val / (double) total); |
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1276 } |
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1277 } |
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1278 |
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1279 static double bytes_to_mb(size_t val) { |
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1280 return (double) val / (double) M; |
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1281 } |
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1282 |
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1283 // See the .cpp file. |
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1284 size_t get_hum_bytes(size_t* hum_bytes); |
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1285 void get_hum_bytes(size_t* used_bytes, size_t* capacity_bytes, |
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1286 size_t* prev_live_bytes, size_t* next_live_bytes); |
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1287 |
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1288 public: |
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1289 // The header and footer are printed in the constructor and |
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1290 // destructor respectively. |
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1291 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name); |
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1292 virtual bool doHeapRegion(HeapRegion* r); |
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1293 ~G1PrintRegionLivenessInfoClosure(); |
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1294 }; |
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|
1295 |
| 1972 | 1296 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP |