Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.hpp @ 12233:40136aa2cdb1
8010722: assert: failed: heap size is too big for compressed oops
Summary: Use conservative assumptions of required alignment for the various garbage collector components into account when determining the maximum heap size that supports compressed oops. Using this conservative value avoids several circular dependencies in the calculation.
Reviewed-by: stefank, dholmes
| author | tschatzl |
|---|---|
| date | Wed, 11 Sep 2013 16:25:02 +0200 |
| parents | 5888334c9c24 |
| children | 63a4eb8bcd23 58fc1b1523dc |
| 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 | |
| 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 bool do_object_b(oop obj); |
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48 }; |
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49 |
| 342 | 50 // A generic CM bit map. This is essentially a wrapper around the BitMap |
| 51 // class, with one bit per (1<<_shifter) HeapWords. | |
| 52 | |
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53 class CMBitMapRO VALUE_OBJ_CLASS_SPEC { |
| 342 | 54 protected: |
| 55 HeapWord* _bmStartWord; // base address of range covered by map | |
| 56 size_t _bmWordSize; // map size (in #HeapWords covered) | |
| 57 const int _shifter; // map to char or bit | |
| 58 VirtualSpace _virtual_space; // underlying the bit map | |
| 59 BitMap _bm; // the bit map itself | |
| 60 | |
| 61 public: | |
| 62 // constructor | |
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63 CMBitMapRO(int shifter); |
| 342 | 64 |
| 65 enum { do_yield = true }; | |
| 66 | |
| 67 // inquiries | |
| 68 HeapWord* startWord() const { return _bmStartWord; } | |
| 69 size_t sizeInWords() const { return _bmWordSize; } | |
| 70 // the following is one past the last word in space | |
| 71 HeapWord* endWord() const { return _bmStartWord + _bmWordSize; } | |
| 72 | |
| 73 // read marks | |
| 74 | |
| 75 bool isMarked(HeapWord* addr) const { | |
| 76 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
| 77 "outside underlying space?"); | |
| 78 return _bm.at(heapWordToOffset(addr)); | |
| 79 } | |
| 80 | |
| 81 // iteration | |
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82 inline bool iterate(BitMapClosure* cl, MemRegion mr); |
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83 inline bool iterate(BitMapClosure* cl); |
| 342 | 84 |
| 85 // Return the address corresponding to the next marked bit at or after | |
| 86 // "addr", and before "limit", if "limit" is non-NULL. If there is no | |
| 87 // such bit, returns "limit" if that is non-NULL, or else "endWord()". | |
| 88 HeapWord* getNextMarkedWordAddress(HeapWord* addr, | |
| 89 HeapWord* limit = NULL) const; | |
| 90 // Return the address corresponding to the next unmarked bit at or after | |
| 91 // "addr", and before "limit", if "limit" is non-NULL. If there is no | |
| 92 // such bit, returns "limit" if that is non-NULL, or else "endWord()". | |
| 93 HeapWord* getNextUnmarkedWordAddress(HeapWord* addr, | |
| 94 HeapWord* limit = NULL) const; | |
| 95 | |
| 96 // conversion utilities | |
| 97 HeapWord* offsetToHeapWord(size_t offset) const { | |
| 98 return _bmStartWord + (offset << _shifter); | |
| 99 } | |
| 100 size_t heapWordToOffset(HeapWord* addr) const { | |
| 101 return pointer_delta(addr, _bmStartWord) >> _shifter; | |
| 102 } | |
| 103 int heapWordDiffToOffsetDiff(size_t diff) const; | |
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104 |
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105 // The argument addr should be the start address of a valid object |
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106 HeapWord* nextObject(HeapWord* addr) { |
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107 oop obj = (oop) addr; |
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108 HeapWord* res = addr + obj->size(); |
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109 assert(offsetToHeapWord(heapWordToOffset(res)) == res, "sanity"); |
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110 return res; |
| 342 | 111 } |
| 112 | |
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113 void print_on_error(outputStream* st, const char* prefix) const; |
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114 |
| 342 | 115 // debugging |
| 116 NOT_PRODUCT(bool covers(ReservedSpace rs) const;) | |
| 117 }; | |
| 118 | |
| 119 class CMBitMap : public CMBitMapRO { | |
| 120 | |
| 121 public: | |
| 122 // constructor | |
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123 CMBitMap(int shifter) : |
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124 CMBitMapRO(shifter) {} |
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125 |
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126 // Allocates the back store for the marking bitmap |
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127 bool allocate(ReservedSpace heap_rs); |
| 342 | 128 |
| 129 // write marks | |
| 130 void mark(HeapWord* addr) { | |
| 131 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
| 132 "outside underlying space?"); | |
| 3771 | 133 _bm.set_bit(heapWordToOffset(addr)); |
| 342 | 134 } |
| 135 void clear(HeapWord* addr) { | |
| 136 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
| 137 "outside underlying space?"); | |
| 3771 | 138 _bm.clear_bit(heapWordToOffset(addr)); |
| 342 | 139 } |
| 140 bool parMark(HeapWord* addr) { | |
| 141 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
| 142 "outside underlying space?"); | |
| 3771 | 143 return _bm.par_set_bit(heapWordToOffset(addr)); |
| 342 | 144 } |
| 145 bool parClear(HeapWord* addr) { | |
| 146 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
| 147 "outside underlying space?"); | |
| 3771 | 148 return _bm.par_clear_bit(heapWordToOffset(addr)); |
| 342 | 149 } |
| 150 void markRange(MemRegion mr); | |
| 151 void clearAll(); | |
| 152 void clearRange(MemRegion mr); | |
| 153 | |
| 154 // Starting at the bit corresponding to "addr" (inclusive), find the next | |
| 155 // "1" bit, if any. This bit starts some run of consecutive "1"'s; find | |
| 156 // the end of this run (stopping at "end_addr"). Return the MemRegion | |
| 157 // covering from the start of the region corresponding to the first bit | |
| 158 // of the run to the end of the region corresponding to the last bit of | |
| 159 // the run. If there is no "1" bit at or after "addr", return an empty | |
| 160 // MemRegion. | |
| 161 MemRegion getAndClearMarkedRegion(HeapWord* addr, HeapWord* end_addr); | |
| 162 }; | |
| 163 | |
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164 // Represents a marking stack used by ConcurrentMarking in the G1 collector. |
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165 class CMMarkStack VALUE_OBJ_CLASS_SPEC { |
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166 VirtualSpace _virtual_space; // Underlying backing store for actual stack |
| 342 | 167 ConcurrentMark* _cm; |
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168 oop* _base; // bottom of stack |
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169 jint _index; // one more than last occupied index |
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170 jint _capacity; // max #elements |
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171 jint _saved_index; // value of _index saved at start of GC |
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172 NOT_PRODUCT(jint _max_depth;) // max depth plumbed during run |
| 342 | 173 |
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174 bool _overflow; |
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175 bool _should_expand; |
| 342 | 176 DEBUG_ONLY(bool _drain_in_progress;) |
| 177 DEBUG_ONLY(bool _drain_in_progress_yields;) | |
| 178 | |
| 179 public: | |
| 180 CMMarkStack(ConcurrentMark* cm); | |
| 181 ~CMMarkStack(); | |
| 182 | |
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183 #ifndef PRODUCT |
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184 jint max_depth() const { |
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185 return _max_depth; |
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186 } |
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187 #endif |
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188 |
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189 bool allocate(size_t capacity); |
| 342 | 190 |
| 191 oop pop() { | |
| 192 if (!isEmpty()) { | |
| 193 return _base[--_index] ; | |
| 194 } | |
| 195 return NULL; | |
| 196 } | |
| 197 | |
| 198 // If overflow happens, don't do the push, and record the overflow. | |
| 199 // *Requires* that "ptr" is already marked. | |
| 200 void push(oop ptr) { | |
| 201 if (isFull()) { | |
| 202 // Record overflow. | |
| 203 _overflow = true; | |
| 204 return; | |
| 205 } else { | |
| 206 _base[_index++] = ptr; | |
| 207 NOT_PRODUCT(_max_depth = MAX2(_max_depth, _index)); | |
| 208 } | |
| 209 } | |
| 210 // Non-block impl. Note: concurrency is allowed only with other | |
| 211 // "par_push" operations, not with "pop" or "drain". We would need | |
| 212 // parallel versions of them if such concurrency was desired. | |
| 213 void par_push(oop ptr); | |
| 214 | |
| 215 // Pushes the first "n" elements of "ptr_arr" on the stack. | |
| 216 // Non-block impl. Note: concurrency is allowed only with other | |
| 217 // "par_adjoin_arr" or "push" operations, not with "pop" or "drain". | |
| 218 void par_adjoin_arr(oop* ptr_arr, int n); | |
| 219 | |
| 220 // Pushes the first "n" elements of "ptr_arr" on the stack. | |
| 221 // Locking impl: concurrency is allowed only with | |
| 222 // "par_push_arr" and/or "par_pop_arr" operations, which use the same | |
| 223 // locking strategy. | |
| 224 void par_push_arr(oop* ptr_arr, int n); | |
| 225 | |
| 226 // If returns false, the array was empty. Otherwise, removes up to "max" | |
| 227 // elements from the stack, and transfers them to "ptr_arr" in an | |
| 228 // unspecified order. The actual number transferred is given in "n" ("n | |
| 229 // == 0" is deliberately redundant with the return value.) Locking impl: | |
| 230 // concurrency is allowed only with "par_push_arr" and/or "par_pop_arr" | |
| 231 // operations, which use the same locking strategy. | |
| 232 bool par_pop_arr(oop* ptr_arr, int max, int* n); | |
| 233 | |
| 234 // Drain the mark stack, applying the given closure to all fields of | |
| 235 // objects on the stack. (That is, continue until the stack is empty, | |
| 236 // even if closure applications add entries to the stack.) The "bm" | |
| 237 // argument, if non-null, may be used to verify that only marked objects | |
| 238 // are on the mark stack. If "yield_after" is "true", then the | |
| 239 // concurrent marker performing the drain offers to yield after | |
| 240 // processing each object. If a yield occurs, stops the drain operation | |
| 241 // and returns false. Otherwise, returns true. | |
| 242 template<class OopClosureClass> | |
| 243 bool drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after = false); | |
| 244 | |
| 245 bool isEmpty() { return _index == 0; } | |
| 246 bool isFull() { return _index == _capacity; } | |
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247 int maxElems() { return _capacity; } |
| 342 | 248 |
| 249 bool overflow() { return _overflow; } | |
| 250 void clear_overflow() { _overflow = false; } | |
| 251 | |
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252 bool should_expand() const { return _should_expand; } |
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253 void set_should_expand(); |
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254 |
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255 // Expand the stack, typically in response to an overflow condition |
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256 void expand(); |
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257 |
| 342 | 258 int size() { return _index; } |
| 259 | |
| 260 void setEmpty() { _index = 0; clear_overflow(); } | |
| 261 | |
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262 // Record the current index. |
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263 void note_start_of_gc(); |
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264 |
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265 // Make sure that we have not added any entries to the stack during GC. |
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266 void note_end_of_gc(); |
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267 |
| 342 | 268 // iterate over the oops in the mark stack, up to the bound recorded via |
| 269 // the call above. | |
| 270 void oops_do(OopClosure* f); | |
| 271 }; | |
| 272 | |
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273 class ForceOverflowSettings VALUE_OBJ_CLASS_SPEC { |
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274 private: |
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275 #ifndef PRODUCT |
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276 uintx _num_remaining; |
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277 bool _force; |
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278 #endif // !defined(PRODUCT) |
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279 |
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280 public: |
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281 void init() PRODUCT_RETURN; |
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282 void update() PRODUCT_RETURN; |
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283 bool should_force() PRODUCT_RETURN_( return false; ); |
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284 }; |
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285 |
| 342 | 286 // this will enable a variety of different statistics per GC task |
| 287 #define _MARKING_STATS_ 0 | |
| 288 // this will enable the higher verbose levels | |
| 289 #define _MARKING_VERBOSE_ 0 | |
| 290 | |
| 291 #if _MARKING_STATS_ | |
| 292 #define statsOnly(statement) \ | |
| 293 do { \ | |
| 294 statement ; \ | |
| 295 } while (0) | |
| 296 #else // _MARKING_STATS_ | |
| 297 #define statsOnly(statement) \ | |
| 298 do { \ | |
| 299 } while (0) | |
| 300 #endif // _MARKING_STATS_ | |
| 301 | |
| 302 typedef enum { | |
| 303 no_verbose = 0, // verbose turned off | |
| 304 stats_verbose, // only prints stats at the end of marking | |
| 305 low_verbose, // low verbose, mostly per region and per major event | |
| 306 medium_verbose, // a bit more detailed than low | |
| 307 high_verbose // per object verbose | |
| 308 } CMVerboseLevel; | |
| 309 | |
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310 class YoungList; |
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311 |
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312 // Root Regions are regions that are not empty at the beginning of a |
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313 // marking cycle and which we might collect during an evacuation pause |
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314 // while the cycle is active. Given that, during evacuation pauses, we |
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315 // do not copy objects that are explicitly marked, what we have to do |
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316 // for the root regions is to scan them and mark all objects reachable |
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317 // from them. According to the SATB assumptions, we only need to visit |
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318 // each object once during marking. So, as long as we finish this scan |
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319 // before the next evacuation pause, we can copy the objects from the |
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320 // root regions without having to mark them or do anything else to them. |
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321 // |
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322 // Currently, we only support root region scanning once (at the start |
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323 // of the marking cycle) and the root regions are all the survivor |
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324 // regions populated during the initial-mark pause. |
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325 class CMRootRegions VALUE_OBJ_CLASS_SPEC { |
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326 private: |
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327 YoungList* _young_list; |
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328 ConcurrentMark* _cm; |
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329 |
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330 volatile bool _scan_in_progress; |
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331 volatile bool _should_abort; |
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332 HeapRegion* volatile _next_survivor; |
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333 |
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334 public: |
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335 CMRootRegions(); |
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336 // We actually do most of the initialization in this method. |
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337 void init(G1CollectedHeap* g1h, ConcurrentMark* cm); |
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338 |
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339 // Reset the claiming / scanning of the root regions. |
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340 void prepare_for_scan(); |
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341 |
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342 // Forces get_next() to return NULL so that the iteration aborts early. |
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343 void abort() { _should_abort = true; } |
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344 |
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345 // Return true if the CM thread are actively scanning root regions, |
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346 // false otherwise. |
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347 bool scan_in_progress() { return _scan_in_progress; } |
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348 |
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349 // Claim the next root region to scan atomically, or return NULL if |
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350 // all have been claimed. |
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351 HeapRegion* claim_next(); |
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352 |
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353 // Flag that we're done with root region scanning and notify anyone |
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354 // who's waiting on it. If aborted is false, assume that all regions |
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355 // have been claimed. |
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356 void scan_finished(); |
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357 |
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358 // If CM threads are still scanning root regions, wait until they |
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359 // are done. Return true if we had to wait, false otherwise. |
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360 bool wait_until_scan_finished(); |
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361 }; |
| 342 | 362 |
| 363 class ConcurrentMarkThread; | |
| 364 | |
| 6197 | 365 class ConcurrentMark: public CHeapObj<mtGC> { |
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366 friend class CMMarkStack; |
| 342 | 367 friend class ConcurrentMarkThread; |
| 368 friend class CMTask; | |
| 369 friend class CMBitMapClosure; | |
| 370 friend class CMGlobalObjectClosure; | |
| 371 friend class CMRemarkTask; | |
| 372 friend class CMConcurrentMarkingTask; | |
| 373 friend class G1ParNoteEndTask; | |
| 374 friend class CalcLiveObjectsClosure; | |
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375 friend class G1CMRefProcTaskProxy; |
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376 friend class G1CMRefProcTaskExecutor; |
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377 friend class G1CMKeepAliveAndDrainClosure; |
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378 friend class G1CMDrainMarkingStackClosure; |
| 342 | 379 |
| 380 protected: | |
| 381 ConcurrentMarkThread* _cmThread; // the thread doing the work | |
| 382 G1CollectedHeap* _g1h; // the heap. | |
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383 uint _parallel_marking_threads; // the number of marking |
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384 // threads we're use |
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385 uint _max_parallel_marking_threads; // max number of marking |
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386 // threads we'll ever use |
| 342 | 387 double _sleep_factor; // how much we have to sleep, with |
| 388 // respect to the work we just did, to | |
| 389 // meet the marking overhead goal | |
| 390 double _marking_task_overhead; // marking target overhead for | |
| 391 // a single task | |
| 392 | |
| 393 // same as the two above, but for the cleanup task | |
| 394 double _cleanup_sleep_factor; | |
| 395 double _cleanup_task_overhead; | |
| 396 | |
| 2152 | 397 FreeRegionList _cleanup_list; |
| 342 | 398 |
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399 // Concurrent marking support structures |
| 342 | 400 CMBitMap _markBitMap1; |
| 401 CMBitMap _markBitMap2; | |
| 402 CMBitMapRO* _prevMarkBitMap; // completed mark bitmap | |
| 403 CMBitMap* _nextMarkBitMap; // under-construction mark bitmap | |
| 404 | |
| 405 BitMap _region_bm; | |
| 406 BitMap _card_bm; | |
| 407 | |
| 408 // Heap bounds | |
| 409 HeapWord* _heap_start; | |
| 410 HeapWord* _heap_end; | |
| 411 | |
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412 // Root region tracking and claiming. |
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413 CMRootRegions _root_regions; |
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414 |
| 342 | 415 // For gray objects |
| 416 CMMarkStack _markStack; // Grey objects behind global finger. | |
| 417 HeapWord* volatile _finger; // the global finger, region aligned, | |
| 418 // always points to the end of the | |
| 419 // last claimed region | |
| 420 | |
| 421 // marking tasks | |
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422 uint _max_worker_id;// maximum worker id |
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423 uint _active_tasks; // task num currently active |
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424 CMTask** _tasks; // task queue array (max_worker_id len) |
| 342 | 425 CMTaskQueueSet* _task_queues; // task queue set |
| 426 ParallelTaskTerminator _terminator; // for termination | |
| 427 | |
| 428 // Two sync barriers that are used to synchronise tasks when an | |
| 429 // overflow occurs. The algorithm is the following. All tasks enter | |
| 430 // the first one to ensure that they have all stopped manipulating | |
| 431 // the global data structures. After they exit it, they re-initialise | |
| 432 // their data structures and task 0 re-initialises the global data | |
| 433 // structures. Then, they enter the second sync barrier. This | |
| 434 // ensure, that no task starts doing work before all data | |
| 435 // structures (local and global) have been re-initialised. When they | |
| 436 // exit it, they are free to start working again. | |
| 437 WorkGangBarrierSync _first_overflow_barrier_sync; | |
| 438 WorkGangBarrierSync _second_overflow_barrier_sync; | |
| 439 | |
| 440 // this is set by any task, when an overflow on the global data | |
| 441 // structures is detected. | |
| 442 volatile bool _has_overflown; | |
| 443 // true: marking is concurrent, false: we're in remark | |
| 444 volatile bool _concurrent; | |
| 445 // set at the end of a Full GC so that marking aborts | |
| 446 volatile bool _has_aborted; | |
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447 |
| 342 | 448 // used when remark aborts due to an overflow to indicate that |
| 449 // another concurrent marking phase should start | |
| 450 volatile bool _restart_for_overflow; | |
| 451 | |
| 452 // This is true from the very start of concurrent marking until the | |
| 453 // point when all the tasks complete their work. It is really used | |
| 454 // to determine the points between the end of concurrent marking and | |
| 455 // time of remark. | |
| 456 volatile bool _concurrent_marking_in_progress; | |
| 457 | |
| 458 // verbose level | |
| 459 CMVerboseLevel _verbose_level; | |
| 460 | |
| 461 // All of these times are in ms. | |
| 462 NumberSeq _init_times; | |
| 463 NumberSeq _remark_times; | |
| 464 NumberSeq _remark_mark_times; | |
| 465 NumberSeq _remark_weak_ref_times; | |
| 466 NumberSeq _cleanup_times; | |
| 467 double _total_counting_time; | |
| 468 double _total_rs_scrub_time; | |
| 469 | |
| 470 double* _accum_task_vtime; // accumulated task vtime | |
| 471 | |
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472 FlexibleWorkGang* _parallel_workers; |
| 342 | 473 |
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474 ForceOverflowSettings _force_overflow_conc; |
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475 ForceOverflowSettings _force_overflow_stw; |
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476 |
| 342 | 477 void weakRefsWork(bool clear_all_soft_refs); |
| 478 | |
| 479 void swapMarkBitMaps(); | |
| 480 | |
| 481 // It resets the global marking data structures, as well as the | |
| 482 // task local ones; should be called during initial mark. | |
| 483 void reset(); | |
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484 |
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485 // Resets all the marking data structures. Called when we have to restart |
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486 // marking or when marking completes (via set_non_marking_state below). |
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487 void reset_marking_state(bool clear_overflow = true); |
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488 |
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489 // We do this after we're done with marking so that the marking data |
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490 // structures are initialised to a sensible and predictable state. |
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491 void set_non_marking_state(); |
| 342 | 492 |
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493 // Called to indicate how many threads are currently active. |
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494 void set_concurrency(uint active_tasks); |
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495 |
| 342 | 496 // It should be called to indicate which phase we're in (concurrent |
| 497 // mark or remark) and how many threads are currently active. | |
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498 void set_concurrency_and_phase(uint active_tasks, bool concurrent); |
| 342 | 499 |
| 500 // prints all gathered CM-related statistics | |
| 501 void print_stats(); | |
| 502 | |
| 2152 | 503 bool cleanup_list_is_empty() { |
| 504 return _cleanup_list.is_empty(); | |
| 505 } | |
| 506 | |
| 342 | 507 // accessor methods |
|
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508 uint parallel_marking_threads() const { return _parallel_marking_threads; } |
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509 uint max_parallel_marking_threads() const { return _max_parallel_marking_threads;} |
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510 double sleep_factor() { return _sleep_factor; } |
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511 double marking_task_overhead() { return _marking_task_overhead;} |
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512 double cleanup_sleep_factor() { return _cleanup_sleep_factor; } |
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513 double cleanup_task_overhead() { return _cleanup_task_overhead;} |
| 342 | 514 |
|
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515 bool use_parallel_marking_threads() const { |
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516 assert(parallel_marking_threads() <= |
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517 max_parallel_marking_threads(), "sanity"); |
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518 assert((_parallel_workers == NULL && parallel_marking_threads() == 0) || |
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519 parallel_marking_threads() > 0, |
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520 "parallel workers not set up correctly"); |
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521 return _parallel_workers != NULL; |
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522 } |
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523 |
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524 HeapWord* finger() { return _finger; } |
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525 bool concurrent() { return _concurrent; } |
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526 uint active_tasks() { return _active_tasks; } |
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527 ParallelTaskTerminator* terminator() { return &_terminator; } |
| 342 | 528 |
| 529 // It claims the next available region to be scanned by a marking | |
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530 // task/thread. It might return NULL if the next region is empty or |
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531 // we have run out of regions. In the latter case, out_of_regions() |
| 342 | 532 // determines whether we've really run out of regions or the task |
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533 // should call claim_region() again. This might seem a bit |
| 342 | 534 // awkward. Originally, the code was written so that claim_region() |
| 535 // either successfully returned with a non-empty region or there | |
| 536 // were no more regions to be claimed. The problem with this was | |
| 537 // that, in certain circumstances, it iterated over large chunks of | |
| 538 // the heap finding only empty regions and, while it was working, it | |
| 539 // was preventing the calling task to call its regular clock | |
| 540 // method. So, this way, each task will spend very little time in | |
| 541 // claim_region() and is allowed to call the regular clock method | |
| 542 // frequently. | |
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543 HeapRegion* claim_region(uint worker_id); |
| 342 | 544 |
| 545 // It determines whether we've run out of regions to scan. | |
| 546 bool out_of_regions() { return _finger == _heap_end; } | |
| 547 | |
| 548 // Returns the task with the given id | |
| 549 CMTask* task(int id) { | |
|
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550 assert(0 <= id && id < (int) _active_tasks, |
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551 "task id not within active bounds"); |
| 342 | 552 return _tasks[id]; |
| 553 } | |
| 554 | |
| 555 // Returns the task queue with the given id | |
| 556 CMTaskQueue* task_queue(int id) { | |
|
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557 assert(0 <= id && id < (int) _active_tasks, |
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558 "task queue id not within active bounds"); |
| 342 | 559 return (CMTaskQueue*) _task_queues->queue(id); |
| 560 } | |
| 561 | |
| 562 // Returns the task queue set | |
| 563 CMTaskQueueSet* task_queues() { return _task_queues; } | |
| 564 | |
| 565 // Access / manipulation of the overflow flag which is set to | |
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566 // indicate that the global stack has overflown |
| 342 | 567 bool has_overflown() { return _has_overflown; } |
| 568 void set_has_overflown() { _has_overflown = true; } | |
| 569 void clear_has_overflown() { _has_overflown = false; } | |
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570 bool restart_for_overflow() { return _restart_for_overflow; } |
| 342 | 571 |
| 572 // Methods to enter the two overflow sync barriers | |
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573 void enter_first_sync_barrier(uint worker_id); |
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574 void enter_second_sync_barrier(uint worker_id); |
| 342 | 575 |
|
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576 ForceOverflowSettings* force_overflow_conc() { |
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577 return &_force_overflow_conc; |
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578 } |
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579 |
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580 ForceOverflowSettings* force_overflow_stw() { |
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581 return &_force_overflow_stw; |
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582 } |
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583 |
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584 ForceOverflowSettings* force_overflow() { |
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585 if (concurrent()) { |
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586 return force_overflow_conc(); |
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587 } else { |
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588 return force_overflow_stw(); |
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589 } |
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590 } |
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591 |
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592 // Live Data Counting data structures... |
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593 // These data structures are initialized at the start of |
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594 // marking. They are written to while marking is active. |
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595 // They are aggregated during remark; the aggregated values |
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596 // are then used to populate the _region_bm, _card_bm, and |
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597 // the total live bytes, which are then subsequently updated |
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598 // during cleanup. |
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599 |
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600 // An array of bitmaps (one bit map per task). Each bitmap |
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601 // is used to record the cards spanned by the live objects |
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602 // marked by that task/worker. |
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603 BitMap* _count_card_bitmaps; |
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604 |
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605 // Used to record the number of marked live bytes |
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606 // (for each region, by worker thread). |
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607 size_t** _count_marked_bytes; |
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608 |
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609 // Card index of the bottom of the G1 heap. Used for biasing indices into |
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610 // the card bitmaps. |
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611 intptr_t _heap_bottom_card_num; |
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612 |
|
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613 // Set to true when initialization is complete |
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614 bool _completed_initialization; |
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615 |
| 342 | 616 public: |
| 617 // Manipulation of the global mark stack. | |
| 618 // Notice that the first mark_stack_push is CAS-based, whereas the | |
| 619 // two below are Mutex-based. This is OK since the first one is only | |
| 620 // called during evacuation pauses and doesn't compete with the | |
| 621 // other two (which are called by the marking tasks during | |
| 622 // concurrent marking or remark). | |
| 623 bool mark_stack_push(oop p) { | |
| 624 _markStack.par_push(p); | |
| 625 if (_markStack.overflow()) { | |
| 626 set_has_overflown(); | |
| 627 return false; | |
| 628 } | |
| 629 return true; | |
| 630 } | |
| 631 bool mark_stack_push(oop* arr, int n) { | |
| 632 _markStack.par_push_arr(arr, n); | |
| 633 if (_markStack.overflow()) { | |
| 634 set_has_overflown(); | |
| 635 return false; | |
| 636 } | |
| 637 return true; | |
| 638 } | |
| 639 void mark_stack_pop(oop* arr, int max, int* n) { | |
| 640 _markStack.par_pop_arr(arr, max, n); | |
| 641 } | |
|
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642 size_t mark_stack_size() { return _markStack.size(); } |
| 342 | 643 size_t partial_mark_stack_size_target() { return _markStack.maxElems()/3; } |
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644 bool mark_stack_overflow() { return _markStack.overflow(); } |
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645 bool mark_stack_empty() { return _markStack.isEmpty(); } |
| 342 | 646 |
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647 CMRootRegions* root_regions() { return &_root_regions; } |
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648 |
| 342 | 649 bool concurrent_marking_in_progress() { |
| 650 return _concurrent_marking_in_progress; | |
| 651 } | |
| 652 void set_concurrent_marking_in_progress() { | |
| 653 _concurrent_marking_in_progress = true; | |
| 654 } | |
| 655 void clear_concurrent_marking_in_progress() { | |
| 656 _concurrent_marking_in_progress = false; | |
| 657 } | |
| 658 | |
| 659 void update_accum_task_vtime(int i, double vtime) { | |
| 660 _accum_task_vtime[i] += vtime; | |
| 661 } | |
| 662 | |
| 663 double all_task_accum_vtime() { | |
| 664 double ret = 0.0; | |
|
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665 for (uint i = 0; i < _max_worker_id; ++i) |
| 342 | 666 ret += _accum_task_vtime[i]; |
| 667 return ret; | |
| 668 } | |
| 669 | |
| 670 // Attempts to steal an object from the task queues of other tasks | |
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671 bool try_stealing(uint worker_id, int* hash_seed, oop& obj) { |
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672 return _task_queues->steal(worker_id, hash_seed, obj); |
| 342 | 673 } |
| 674 | |
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675 ConcurrentMark(G1CollectedHeap* g1h, ReservedSpace heap_rs); |
| 342 | 676 ~ConcurrentMark(); |
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677 |
| 342 | 678 ConcurrentMarkThread* cmThread() { return _cmThread; } |
| 679 | |
| 680 CMBitMapRO* prevMarkBitMap() const { return _prevMarkBitMap; } | |
| 681 CMBitMap* nextMarkBitMap() const { return _nextMarkBitMap; } | |
| 682 | |
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683 // Returns the number of GC threads to be used in a concurrent |
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684 // phase based on the number of GC threads being used in a STW |
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685 // phase. |
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686 uint scale_parallel_threads(uint n_par_threads); |
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687 |
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688 // Calculates the number of GC threads to be used in a concurrent phase. |
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689 uint calc_parallel_marking_threads(); |
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690 |
| 342 | 691 // The following three are interaction between CM and |
| 692 // G1CollectedHeap | |
| 693 | |
| 694 // This notifies CM that a root during initial-mark needs to be | |
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695 // grayed. It is MT-safe. word_size is the size of the object in |
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696 // words. It is passed explicitly as sometimes we cannot calculate |
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697 // it from the given object because it might be in an inconsistent |
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698 // state (e.g., in to-space and being copied). So the caller is |
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699 // responsible for dealing with this issue (e.g., get the size from |
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700 // the from-space image when the to-space image might be |
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701 // inconsistent) and always passing the size. hr is the region that |
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702 // contains the object and it's passed optionally from callers who |
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703 // might already have it (no point in recalculating it). |
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704 inline void grayRoot(oop obj, size_t word_size, |
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705 uint worker_id, HeapRegion* hr = NULL); |
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706 |
| 1388 | 707 // It iterates over the heap and for each object it comes across it |
| 708 // will dump the contents of its reference fields, as well as | |
| 709 // liveness information for the object and its referents. The dump | |
| 710 // will be written to a file with the following name: | |
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711 // G1PrintReachableBaseFile + "." + str. |
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712 // vo decides whether the prev (vo == UsePrevMarking), the next |
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713 // (vo == UseNextMarking) marking information, or the mark word |
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714 // (vo == UseMarkWord) will be used to determine the liveness of |
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715 // each object / referent. |
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716 // If all is true, all objects in the heap will be dumped, otherwise |
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717 // only the live ones. In the dump the following symbols / breviations |
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718 // are used: |
| 1388 | 719 // M : an explicitly live object (its bitmap bit is set) |
| 720 // > : an implicitly live object (over tams) | |
| 721 // O : an object outside the G1 heap (typically: in the perm gen) | |
| 722 // NOT : a reference field whose referent is not live | |
| 723 // AND MARKED : indicates that an object is both explicitly and | |
| 724 // implicitly live (it should be one or the other, not both) | |
| 725 void print_reachable(const char* str, | |
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726 VerifyOption vo, bool all) PRODUCT_RETURN; |
| 342 | 727 |
| 728 // Clear the next marking bitmap (will be called concurrently). | |
| 729 void clearNextBitmap(); | |
| 730 | |
| 731 // These two do the work that needs to be done before and after the | |
| 732 // initial root checkpoint. Since this checkpoint can be done at two | |
| 733 // different points (i.e. an explicit pause or piggy-backed on a | |
| 734 // young collection), then it's nice to be able to easily share the | |
| 735 // pre/post code. It might be the case that we can put everything in | |
| 736 // the post method. TP | |
| 737 void checkpointRootsInitialPre(); | |
| 738 void checkpointRootsInitialPost(); | |
| 739 | |
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740 // Scan all the root regions and mark everything reachable from |
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741 // them. |
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742 void scanRootRegions(); |
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743 |
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744 // Scan a single root region and mark everything reachable from it. |
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745 void scanRootRegion(HeapRegion* hr, uint worker_id); |
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746 |
| 342 | 747 // Do concurrent phase of marking, to a tentative transitive closure. |
| 748 void markFromRoots(); | |
| 749 | |
| 750 void checkpointRootsFinal(bool clear_all_soft_refs); | |
| 751 void checkpointRootsFinalWork(); | |
| 752 void cleanup(); | |
| 753 void completeCleanup(); | |
| 754 | |
| 755 // Mark in the previous bitmap. NB: this is usually read-only, so use | |
| 756 // this carefully! | |
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757 inline void markPrev(oop p); |
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758 |
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759 // Clears marks for all objects in the given range, for the prev, |
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760 // next, or both bitmaps. NB: the previous bitmap is usually |
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761 // read-only, so use this carefully! |
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762 void clearRangePrevBitmap(MemRegion mr); |
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763 void clearRangeNextBitmap(MemRegion mr); |
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764 void clearRangeBothBitmaps(MemRegion mr); |
| 342 | 765 |
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766 // Notify data structures that a GC has started. |
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767 void note_start_of_gc() { |
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768 _markStack.note_start_of_gc(); |
| 342 | 769 } |
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770 |
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771 // Notify data structures that a GC is finished. |
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772 void note_end_of_gc() { |
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773 _markStack.note_end_of_gc(); |
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774 } |
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775 |
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776 // Verify that there are no CSet oops on the stacks (taskqueues / |
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777 // global mark stack), enqueued SATB buffers, per-thread SATB |
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778 // buffers, and fingers (global / per-task). The boolean parameters |
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779 // decide which of the above data structures to verify. If marking |
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780 // is not in progress, it's a no-op. |
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781 void verify_no_cset_oops(bool verify_stacks, |
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782 bool verify_enqueued_buffers, |
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783 bool verify_thread_buffers, |
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784 bool verify_fingers) PRODUCT_RETURN; |
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785 |
| 342 | 786 // It is called at the end of an evacuation pause during marking so |
| 787 // that CM is notified of where the new end of the heap is. It | |
| 788 // doesn't do anything if concurrent_marking_in_progress() is false, | |
| 789 // unless the force parameter is true. | |
| 790 void update_g1_committed(bool force = false); | |
| 791 | |
| 792 bool isMarked(oop p) const { | |
| 793 assert(p != NULL && p->is_oop(), "expected an oop"); | |
| 794 HeapWord* addr = (HeapWord*)p; | |
| 795 assert(addr >= _nextMarkBitMap->startWord() || | |
| 796 addr < _nextMarkBitMap->endWord(), "in a region"); | |
| 797 | |
| 798 return _nextMarkBitMap->isMarked(addr); | |
| 799 } | |
| 800 | |
| 801 inline bool not_yet_marked(oop p) const; | |
| 802 | |
| 803 // XXX Debug code | |
| 804 bool containing_card_is_marked(void* p); | |
| 805 bool containing_cards_are_marked(void* start, void* last); | |
| 806 | |
| 807 bool isPrevMarked(oop p) const { | |
| 808 assert(p != NULL && p->is_oop(), "expected an oop"); | |
| 809 HeapWord* addr = (HeapWord*)p; | |
| 810 assert(addr >= _prevMarkBitMap->startWord() || | |
| 811 addr < _prevMarkBitMap->endWord(), "in a region"); | |
| 812 | |
| 813 return _prevMarkBitMap->isMarked(addr); | |
| 814 } | |
| 815 | |
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816 inline bool do_yield_check(uint worker_i = 0); |
| 342 | 817 inline bool should_yield(); |
| 818 | |
| 819 // Called to abort the marking cycle after a Full GC takes palce. | |
| 820 void abort(); | |
| 821 | |
| 10405 | 822 bool has_aborted() { return _has_aborted; } |
| 823 | |
| 342 | 824 // This prints the global/local fingers. It is used for debugging. |
| 825 NOT_PRODUCT(void print_finger();) | |
| 826 | |
| 827 void print_summary_info(); | |
| 828 | |
| 1019 | 829 void print_worker_threads_on(outputStream* st) const; |
| 830 | |
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831 void print_on_error(outputStream* st) const; |
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832 |
| 342 | 833 // The following indicate whether a given verbose level has been |
| 834 // set. Notice that anything above stats is conditional to | |
| 835 // _MARKING_VERBOSE_ having been set to 1 | |
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836 bool verbose_stats() { |
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837 return _verbose_level >= stats_verbose; |
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838 } |
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839 bool verbose_low() { |
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840 return _MARKING_VERBOSE_ && _verbose_level >= low_verbose; |
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841 } |
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842 bool verbose_medium() { |
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843 return _MARKING_VERBOSE_ && _verbose_level >= medium_verbose; |
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844 } |
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845 bool verbose_high() { |
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846 return _MARKING_VERBOSE_ && _verbose_level >= high_verbose; |
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847 } |
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848 |
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849 // Liveness counting |
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850 |
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851 // Utility routine to set an exclusive range of cards on the given |
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852 // card liveness bitmap |
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853 inline void set_card_bitmap_range(BitMap* card_bm, |
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854 BitMap::idx_t start_idx, |
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855 BitMap::idx_t end_idx, |
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856 bool is_par); |
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857 |
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858 // Returns the card number of the bottom of the G1 heap. |
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859 // Used in biasing indices into accounting card bitmaps. |
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860 intptr_t heap_bottom_card_num() const { |
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861 return _heap_bottom_card_num; |
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862 } |
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863 |
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864 // Returns the card bitmap for a given task or worker id. |
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865 BitMap* count_card_bitmap_for(uint worker_id) { |
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866 assert(0 <= worker_id && worker_id < _max_worker_id, "oob"); |
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867 assert(_count_card_bitmaps != NULL, "uninitialized"); |
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868 BitMap* task_card_bm = &_count_card_bitmaps[worker_id]; |
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869 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
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870 return task_card_bm; |
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871 } |
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872 |
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873 // Returns the array containing the marked bytes for each region, |
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874 // for the given worker or task id. |
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875 size_t* count_marked_bytes_array_for(uint worker_id) { |
|
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876 assert(0 <= worker_id && worker_id < _max_worker_id, "oob"); |
|
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877 assert(_count_marked_bytes != NULL, "uninitialized"); |
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878 size_t* marked_bytes_array = _count_marked_bytes[worker_id]; |
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879 assert(marked_bytes_array != NULL, "uninitialized"); |
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880 return marked_bytes_array; |
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881 } |
|
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882 |
|
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883 // Returns the index in the liveness accounting card table bitmap |
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884 // for the given address |
|
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885 inline BitMap::idx_t card_bitmap_index_for(HeapWord* addr); |
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886 |
|
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887 // Counts the size of the given memory region in the the given |
|
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888 // marked_bytes array slot for the given HeapRegion. |
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889 // Sets the bits in the given card bitmap that are associated with the |
|
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890 // cards that are spanned by the memory region. |
|
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891 inline void count_region(MemRegion mr, HeapRegion* hr, |
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892 size_t* marked_bytes_array, |
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893 BitMap* task_card_bm); |
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894 |
|
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895 // Counts the given memory region in the task/worker counting |
|
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896 // data structures for the given worker id. |
|
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897 inline void count_region(MemRegion mr, HeapRegion* hr, uint worker_id); |
|
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898 |
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899 // Counts the given memory region in the task/worker counting |
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900 // data structures for the given worker id. |
|
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901 inline void count_region(MemRegion mr, uint worker_id); |
|
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902 |
|
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903 // Counts the given object in the given task/worker counting |
|
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904 // data structures. |
|
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905 inline void count_object(oop obj, HeapRegion* hr, |
|
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906 size_t* marked_bytes_array, |
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907 BitMap* task_card_bm); |
|
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908 |
|
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909 // Counts the given object in the task/worker counting data |
|
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910 // structures for the given worker id. |
|
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911 inline void count_object(oop obj, HeapRegion* hr, uint worker_id); |
|
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912 |
|
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913 // Attempts to mark the given object and, if successful, counts |
|
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914 // the object in the given task/worker counting structures. |
|
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915 inline bool par_mark_and_count(oop obj, HeapRegion* hr, |
|
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916 size_t* marked_bytes_array, |
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917 BitMap* task_card_bm); |
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918 |
|
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919 // Attempts to mark the given object and, if successful, counts |
|
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920 // the object in the task/worker counting structures for the |
|
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921 // given worker id. |
|
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922 inline bool par_mark_and_count(oop obj, size_t word_size, |
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923 HeapRegion* hr, uint worker_id); |
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924 |
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925 // Attempts to mark the given object and, if successful, counts |
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926 // the object in the task/worker counting structures for the |
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927 // given worker id. |
|
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928 inline bool par_mark_and_count(oop obj, HeapRegion* hr, uint worker_id); |
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929 |
|
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930 // Similar to the above routine but we don't know the heap region that |
|
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931 // contains the object to be marked/counted, which this routine looks up. |
|
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932 inline bool par_mark_and_count(oop obj, uint worker_id); |
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933 |
|
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934 // Similar to the above routine but there are times when we cannot |
|
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935 // safely calculate the size of obj due to races and we, therefore, |
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936 // pass the size in as a parameter. It is the caller's reponsibility |
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937 // to ensure that the size passed in for obj is valid. |
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938 inline bool par_mark_and_count(oop obj, size_t word_size, uint worker_id); |
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939 |
|
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940 // Unconditionally mark the given object, and unconditinally count |
|
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941 // the object in the counting structures for worker id 0. |
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942 // Should *not* be called from parallel code. |
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943 inline bool mark_and_count(oop obj, HeapRegion* hr); |
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944 |
|
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945 // Similar to the above routine but we don't know the heap region that |
|
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946 // contains the object to be marked/counted, which this routine looks up. |
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947 // Should *not* be called from parallel code. |
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948 inline bool mark_and_count(oop obj); |
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949 |
|
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950 // Returns true if initialization was successfully completed. |
|
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951 bool completed_initialization() const { |
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952 return _completed_initialization; |
|
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953 } |
|
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|
954 |
|
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|
955 protected: |
|
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|
956 // Clear all the per-task bitmaps and arrays used to store the |
|
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|
957 // counting data. |
|
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|
958 void clear_all_count_data(); |
|
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|
959 |
|
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|
960 // Aggregates the counting data for each worker/task |
|
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961 // that was constructed while marking. Also sets |
|
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|
962 // the amount of marked bytes for each region and |
|
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963 // the top at concurrent mark count. |
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|
964 void aggregate_count_data(); |
|
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|
965 |
|
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|
966 // Verification routine |
|
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967 void verify_count_data(); |
| 342 | 968 }; |
| 969 | |
| 970 // A class representing a marking task. | |
| 971 class CMTask : public TerminatorTerminator { | |
| 972 private: | |
| 973 enum PrivateConstants { | |
| 974 // the regular clock call is called once the scanned words reaches | |
| 975 // this limit | |
| 976 words_scanned_period = 12*1024, | |
| 977 // the regular clock call is called once the number of visited | |
| 978 // references reaches this limit | |
| 979 refs_reached_period = 384, | |
| 980 // initial value for the hash seed, used in the work stealing code | |
| 981 init_hash_seed = 17, | |
| 982 // how many entries will be transferred between global stack and | |
| 983 // local queues | |
| 984 global_stack_transfer_size = 16 | |
| 985 }; | |
| 986 | |
|
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987 uint _worker_id; |
| 342 | 988 G1CollectedHeap* _g1h; |
| 989 ConcurrentMark* _cm; | |
| 990 CMBitMap* _nextMarkBitMap; | |
| 991 // the task queue of this task | |
| 992 CMTaskQueue* _task_queue; | |
|
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993 private: |
| 342 | 994 // the task queue set---needed for stealing |
| 995 CMTaskQueueSet* _task_queues; | |
| 996 // indicates whether the task has been claimed---this is only for | |
| 997 // debugging purposes | |
| 998 bool _claimed; | |
| 999 | |
| 1000 // number of calls to this task | |
| 1001 int _calls; | |
| 1002 | |
| 1003 // when the virtual timer reaches this time, the marking step should | |
| 1004 // exit | |
| 1005 double _time_target_ms; | |
| 1006 // the start time of the current marking step | |
| 1007 double _start_time_ms; | |
| 1008 | |
| 1009 // the oop closure used for iterations over oops | |
| 3771 | 1010 G1CMOopClosure* _cm_oop_closure; |
| 342 | 1011 |
| 1012 // the region this task is scanning, NULL if we're not scanning any | |
| 1013 HeapRegion* _curr_region; | |
| 1014 // the local finger of this task, NULL if we're not scanning a region | |
| 1015 HeapWord* _finger; | |
| 1016 // limit of the region this task is scanning, NULL if we're not scanning one | |
| 1017 HeapWord* _region_limit; | |
| 1018 | |
| 1019 // the number of words this task has scanned | |
| 1020 size_t _words_scanned; | |
| 1021 // When _words_scanned reaches this limit, the regular clock is | |
| 1022 // called. Notice that this might be decreased under certain | |
| 1023 // circumstances (i.e. when we believe that we did an expensive | |
| 1024 // operation). | |
| 1025 size_t _words_scanned_limit; | |
| 1026 // the initial value of _words_scanned_limit (i.e. what it was | |
| 1027 // before it was decreased). | |
| 1028 size_t _real_words_scanned_limit; | |
| 1029 | |
| 1030 // the number of references this task has visited | |
| 1031 size_t _refs_reached; | |
| 1032 // When _refs_reached reaches this limit, the regular clock is | |
| 1033 // called. Notice this this might be decreased under certain | |
| 1034 // circumstances (i.e. when we believe that we did an expensive | |
| 1035 // operation). | |
| 1036 size_t _refs_reached_limit; | |
| 1037 // the initial value of _refs_reached_limit (i.e. what it was before | |
| 1038 // it was decreased). | |
| 1039 size_t _real_refs_reached_limit; | |
| 1040 | |
| 1041 // used by the work stealing stuff | |
| 1042 int _hash_seed; | |
| 1043 // if this is true, then the task has aborted for some reason | |
| 1044 bool _has_aborted; | |
| 1045 // set when the task aborts because it has met its time quota | |
|
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1046 bool _has_timed_out; |
| 342 | 1047 // true when we're draining SATB buffers; this avoids the task |
| 1048 // aborting due to SATB buffers being available (as we're already | |
| 1049 // dealing with them) | |
| 1050 bool _draining_satb_buffers; | |
| 1051 | |
| 1052 // number sequence of past step times | |
| 1053 NumberSeq _step_times_ms; | |
| 1054 // elapsed time of this task | |
| 1055 double _elapsed_time_ms; | |
| 1056 // termination time of this task | |
| 1057 double _termination_time_ms; | |
| 1058 // when this task got into the termination protocol | |
| 1059 double _termination_start_time_ms; | |
| 1060 | |
| 1061 // true when the task is during a concurrent phase, false when it is | |
| 1062 // in the remark phase (so, in the latter case, we do not have to | |
| 1063 // check all the things that we have to check during the concurrent | |
| 1064 // phase, i.e. SATB buffer availability...) | |
| 1065 bool _concurrent; | |
| 1066 | |
| 1067 TruncatedSeq _marking_step_diffs_ms; | |
| 1068 | |
|
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1069 // Counting data structures. Embedding the task's marked_bytes_array |
|
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1070 // and card bitmap into the actual task saves having to go through |
|
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1071 // the ConcurrentMark object. |
|
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|
1072 size_t* _marked_bytes_array; |
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1073 BitMap* _card_bm; |
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1074 |
| 342 | 1075 // LOTS of statistics related with this task |
| 1076 #if _MARKING_STATS_ | |
| 1077 NumberSeq _all_clock_intervals_ms; | |
| 1078 double _interval_start_time_ms; | |
| 1079 | |
| 1080 int _aborted; | |
| 1081 int _aborted_overflow; | |
| 1082 int _aborted_cm_aborted; | |
| 1083 int _aborted_yield; | |
| 1084 int _aborted_timed_out; | |
| 1085 int _aborted_satb; | |
| 1086 int _aborted_termination; | |
| 1087 | |
| 1088 int _steal_attempts; | |
| 1089 int _steals; | |
| 1090 | |
| 1091 int _clock_due_to_marking; | |
| 1092 int _clock_due_to_scanning; | |
| 1093 | |
| 1094 int _local_pushes; | |
| 1095 int _local_pops; | |
| 1096 int _local_max_size; | |
| 1097 int _objs_scanned; | |
| 1098 | |
| 1099 int _global_pushes; | |
| 1100 int _global_pops; | |
| 1101 int _global_max_size; | |
| 1102 | |
| 1103 int _global_transfers_to; | |
| 1104 int _global_transfers_from; | |
| 1105 | |
| 1106 int _regions_claimed; | |
| 1107 int _objs_found_on_bitmap; | |
| 1108 | |
| 1109 int _satb_buffers_processed; | |
| 1110 #endif // _MARKING_STATS_ | |
| 1111 | |
| 1112 // it updates the local fields after this task has claimed | |
| 1113 // a new region to scan | |
| 1114 void setup_for_region(HeapRegion* hr); | |
| 1115 // it brings up-to-date the limit of the region | |
| 1116 void update_region_limit(); | |
| 1117 | |
| 1118 // called when either the words scanned or the refs visited limit | |
| 1119 // has been reached | |
| 1120 void reached_limit(); | |
| 1121 // recalculates the words scanned and refs visited limits | |
| 1122 void recalculate_limits(); | |
| 1123 // decreases the words scanned and refs visited limits when we reach | |
| 1124 // an expensive operation | |
| 1125 void decrease_limits(); | |
| 1126 // it checks whether the words scanned or refs visited reached their | |
| 1127 // respective limit and calls reached_limit() if they have | |
| 1128 void check_limits() { | |
| 1129 if (_words_scanned >= _words_scanned_limit || | |
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1130 _refs_reached >= _refs_reached_limit) { |
| 342 | 1131 reached_limit(); |
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1132 } |
| 342 | 1133 } |
| 1134 // this is supposed to be called regularly during a marking step as | |
| 1135 // it checks a bunch of conditions that might cause the marking step | |
| 1136 // to abort | |
| 1137 void regular_clock_call(); | |
| 1138 bool concurrent() { return _concurrent; } | |
| 1139 | |
| 1140 public: | |
| 1141 // It resets the task; it should be called right at the beginning of | |
| 1142 // a marking phase. | |
| 1143 void reset(CMBitMap* _nextMarkBitMap); | |
| 1144 // it clears all the fields that correspond to a claimed region. | |
| 1145 void clear_region_fields(); | |
| 1146 | |
| 1147 void set_concurrent(bool concurrent) { _concurrent = concurrent; } | |
| 1148 | |
| 1149 // The main method of this class which performs a marking step | |
| 1150 // trying not to exceed the given duration. However, it might exit | |
| 1151 // prematurely, according to some conditions (i.e. SATB buffers are | |
| 1152 // available for processing). | |
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1153 void do_marking_step(double target_ms, |
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1154 bool do_termination, |
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1155 bool is_serial); |
| 342 | 1156 |
| 1157 // These two calls start and stop the timer | |
| 1158 void record_start_time() { | |
| 1159 _elapsed_time_ms = os::elapsedTime() * 1000.0; | |
| 1160 } | |
| 1161 void record_end_time() { | |
| 1162 _elapsed_time_ms = os::elapsedTime() * 1000.0 - _elapsed_time_ms; | |
| 1163 } | |
| 1164 | |
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1165 // returns the worker ID associated with this task. |
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1166 uint worker_id() { return _worker_id; } |
| 342 | 1167 |
| 1168 // From TerminatorTerminator. It determines whether this task should | |
| 1169 // exit the termination protocol after it's entered it. | |
| 1170 virtual bool should_exit_termination(); | |
| 1171 | |
|
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1172 // Resets the local region fields after a task has finished scanning a |
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1173 // region; or when they have become stale as a result of the region |
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1174 // being evacuated. |
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1175 void giveup_current_region(); |
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1176 |
| 342 | 1177 HeapWord* finger() { return _finger; } |
| 1178 | |
| 1179 bool has_aborted() { return _has_aborted; } | |
| 1180 void set_has_aborted() { _has_aborted = true; } | |
| 1181 void clear_has_aborted() { _has_aborted = false; } | |
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1182 bool has_timed_out() { return _has_timed_out; } |
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1183 bool claimed() { return _claimed; } |
| 342 | 1184 |
| 3771 | 1185 void set_cm_oop_closure(G1CMOopClosure* cm_oop_closure); |
| 342 | 1186 |
| 1187 // It grays the object by marking it and, if necessary, pushing it | |
| 1188 // on the local queue | |
| 3771 | 1189 inline void deal_with_reference(oop obj); |
| 342 | 1190 |
| 1191 // It scans an object and visits its children. | |
| 3771 | 1192 void scan_object(oop obj); |
| 342 | 1193 |
| 1194 // It pushes an object on the local queue. | |
| 3771 | 1195 inline void push(oop obj); |
| 342 | 1196 |
| 1197 // These two move entries to/from the global stack. | |
| 1198 void move_entries_to_global_stack(); | |
| 1199 void get_entries_from_global_stack(); | |
| 1200 | |
| 1201 // It pops and scans objects from the local queue. If partially is | |
| 1202 // true, then it stops when the queue size is of a given limit. If | |
| 1203 // partially is false, then it stops when the queue is empty. | |
| 1204 void drain_local_queue(bool partially); | |
| 1205 // It moves entries from the global stack to the local queue and | |
| 1206 // drains the local queue. If partially is true, then it stops when | |
| 1207 // both the global stack and the local queue reach a given size. If | |
| 1208 // partially if false, it tries to empty them totally. | |
| 1209 void drain_global_stack(bool partially); | |
| 1210 // It keeps picking SATB buffers and processing them until no SATB | |
| 1211 // buffers are available. | |
| 1212 void drain_satb_buffers(); | |
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1213 |
| 342 | 1214 // moves the local finger to a new location |
| 1215 inline void move_finger_to(HeapWord* new_finger) { | |
|
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1216 assert(new_finger >= _finger && new_finger < _region_limit, "invariant"); |
| 342 | 1217 _finger = new_finger; |
| 1218 } | |
| 1219 | |
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1220 CMTask(uint worker_id, ConcurrentMark *cm, |
|
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1221 size_t* marked_bytes, BitMap* card_bm, |
| 342 | 1222 CMTaskQueue* task_queue, CMTaskQueueSet* task_queues); |
| 1223 | |
| 1224 // it prints statistics associated with this task | |
| 1225 void print_stats(); | |
| 1226 | |
| 1227 #if _MARKING_STATS_ | |
| 1228 void increase_objs_found_on_bitmap() { ++_objs_found_on_bitmap; } | |
| 1229 #endif // _MARKING_STATS_ | |
| 1230 }; | |
| 1972 | 1231 |
|
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1232 // Class that's used to to print out per-region liveness |
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1233 // information. It's currently used at the end of marking and also |
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1234 // after we sort the old regions at the end of the cleanup operation. |
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1235 class G1PrintRegionLivenessInfoClosure: public HeapRegionClosure { |
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1236 private: |
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1237 outputStream* _out; |
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1238 |
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1239 // Accumulators for these values. |
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1240 size_t _total_used_bytes; |
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1241 size_t _total_capacity_bytes; |
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1242 size_t _total_prev_live_bytes; |
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1243 size_t _total_next_live_bytes; |
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1244 |
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1245 // These are set up when we come across a "stars humongous" region |
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1246 // (as this is where most of this information is stored, not in the |
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1247 // subsequent "continues humongous" regions). After that, for every |
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1248 // region in a given humongous region series we deduce the right |
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1249 // values for it by simply subtracting the appropriate amount from |
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1250 // these fields. All these values should reach 0 after we've visited |
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1251 // the last region in the series. |
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1252 size_t _hum_used_bytes; |
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1253 size_t _hum_capacity_bytes; |
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1254 size_t _hum_prev_live_bytes; |
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1255 size_t _hum_next_live_bytes; |
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1256 |
|
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1257 // Accumulator for the remembered set size |
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1258 size_t _total_remset_bytes; |
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1259 |
| 12080 | 1260 // Accumulator for strong code roots memory size |
| 1261 size_t _total_strong_code_roots_bytes; | |
| 1262 | |
|
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1263 static double perc(size_t val, size_t total) { |
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1264 if (total == 0) { |
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1265 return 0.0; |
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1266 } else { |
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1267 return 100.0 * ((double) val / (double) total); |
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1268 } |
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1269 } |
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1270 |
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1271 static double bytes_to_mb(size_t val) { |
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1272 return (double) val / (double) M; |
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1273 } |
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1274 |
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1275 // See the .cpp file. |
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1276 size_t get_hum_bytes(size_t* hum_bytes); |
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1277 void get_hum_bytes(size_t* used_bytes, size_t* capacity_bytes, |
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1278 size_t* prev_live_bytes, size_t* next_live_bytes); |
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1279 |
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1280 public: |
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1281 // The header and footer are printed in the constructor and |
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1282 // destructor respectively. |
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1283 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name); |
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1284 virtual bool doHeapRegion(HeapRegion* r); |
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1285 ~G1PrintRegionLivenessInfoClosure(); |
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1286 }; |
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1287 |
| 1972 | 1288 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP |