Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/concurrentMark.hpp @ 20305:755930f931e3
8027959: Early reclamation of large objects in G1
Summary: Try to reclaim humongous objects at every young collection after doing a conservative estimate of its liveness.
Reviewed-by: brutisso, mgerdin
author | tschatzl |
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date | Wed, 23 Jul 2014 09:03:32 +0200 |
parents | 3bf2fc51186b |
children | 6701abbc4441 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP | |
27 | |
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28 #include "classfile/javaClasses.hpp" |
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29 #include "gc_implementation/g1/heapRegionSet.hpp" |
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30 #include "gc_implementation/shared/gcId.hpp" |
1972 | 31 #include "utilities/taskqueue.hpp" |
32 | |
342 | 33 class G1CollectedHeap; |
34 class CMTask; | |
6197 | 35 typedef GenericTaskQueue<oop, mtGC> CMTaskQueue; |
36 typedef GenericTaskQueueSet<CMTaskQueue, mtGC> CMTaskQueueSet; | |
342 | 37 |
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38 // Closure used by CM during concurrent reference discovery |
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39 // and reference processing (during remarking) to determine |
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40 // if a particular object is alive. It is primarily used |
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41 // to determine if referents of discovered reference objects |
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42 // are alive. An instance is also embedded into the |
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43 // reference processor as the _is_alive_non_header field |
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44 class G1CMIsAliveClosure: public BoolObjectClosure { |
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45 G1CollectedHeap* _g1; |
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46 public: |
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47 G1CMIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) { } |
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48 |
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49 bool do_object_b(oop obj); |
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50 }; |
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51 |
342 | 52 // A generic CM bit map. This is essentially a wrapper around the BitMap |
53 // class, with one bit per (1<<_shifter) HeapWords. | |
54 | |
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55 class CMBitMapRO VALUE_OBJ_CLASS_SPEC { |
342 | 56 protected: |
57 HeapWord* _bmStartWord; // base address of range covered by map | |
58 size_t _bmWordSize; // map size (in #HeapWords covered) | |
59 const int _shifter; // map to char or bit | |
60 VirtualSpace _virtual_space; // underlying the bit map | |
61 BitMap _bm; // the bit map itself | |
62 | |
63 public: | |
64 // constructor | |
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65 CMBitMapRO(int shifter); |
342 | 66 |
67 enum { do_yield = true }; | |
68 | |
69 // inquiries | |
70 HeapWord* startWord() const { return _bmStartWord; } | |
71 size_t sizeInWords() const { return _bmWordSize; } | |
72 // the following is one past the last word in space | |
73 HeapWord* endWord() const { return _bmStartWord + _bmWordSize; } | |
74 | |
75 // read marks | |
76 | |
77 bool isMarked(HeapWord* addr) const { | |
78 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
79 "outside underlying space?"); | |
80 return _bm.at(heapWordToOffset(addr)); | |
81 } | |
82 | |
83 // iteration | |
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84 inline bool iterate(BitMapClosure* cl, MemRegion mr); |
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85 inline bool iterate(BitMapClosure* cl); |
342 | 86 |
87 // Return the address corresponding to the next marked bit at or after | |
88 // "addr", and before "limit", if "limit" is non-NULL. If there is no | |
89 // such bit, returns "limit" if that is non-NULL, or else "endWord()". | |
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90 HeapWord* getNextMarkedWordAddress(const HeapWord* addr, |
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91 const HeapWord* limit = NULL) const; |
342 | 92 // Return the address corresponding to the next unmarked bit at or after |
93 // "addr", and before "limit", if "limit" is non-NULL. If there is no | |
94 // such bit, returns "limit" if that is non-NULL, or else "endWord()". | |
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95 HeapWord* getNextUnmarkedWordAddress(const HeapWord* addr, |
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96 const HeapWord* limit = NULL) const; |
342 | 97 |
98 // conversion utilities | |
99 HeapWord* offsetToHeapWord(size_t offset) const { | |
100 return _bmStartWord + (offset << _shifter); | |
101 } | |
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102 size_t heapWordToOffset(const HeapWord* addr) const { |
342 | 103 return pointer_delta(addr, _bmStartWord) >> _shifter; |
104 } | |
105 int heapWordDiffToOffsetDiff(size_t diff) const; | |
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106 |
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107 // The argument addr should be the start address of a valid object |
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108 HeapWord* nextObject(HeapWord* addr) { |
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109 oop obj = (oop) addr; |
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110 HeapWord* res = addr + obj->size(); |
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111 assert(offsetToHeapWord(heapWordToOffset(res)) == res, "sanity"); |
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112 return res; |
342 | 113 } |
114 | |
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115 void print_on_error(outputStream* st, const char* prefix) const; |
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116 |
342 | 117 // debugging |
118 NOT_PRODUCT(bool covers(ReservedSpace rs) const;) | |
119 }; | |
120 | |
121 class CMBitMap : public CMBitMapRO { | |
122 | |
123 public: | |
124 // constructor | |
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125 CMBitMap(int shifter) : |
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126 CMBitMapRO(shifter) {} |
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127 |
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128 // Allocates the back store for the marking bitmap |
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129 bool allocate(ReservedSpace heap_rs); |
342 | 130 |
131 // write marks | |
132 void mark(HeapWord* addr) { | |
133 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
134 "outside underlying space?"); | |
3771 | 135 _bm.set_bit(heapWordToOffset(addr)); |
342 | 136 } |
137 void clear(HeapWord* addr) { | |
138 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
139 "outside underlying space?"); | |
3771 | 140 _bm.clear_bit(heapWordToOffset(addr)); |
342 | 141 } |
142 bool parMark(HeapWord* addr) { | |
143 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
144 "outside underlying space?"); | |
3771 | 145 return _bm.par_set_bit(heapWordToOffset(addr)); |
342 | 146 } |
147 bool parClear(HeapWord* addr) { | |
148 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
149 "outside underlying space?"); | |
3771 | 150 return _bm.par_clear_bit(heapWordToOffset(addr)); |
342 | 151 } |
152 void markRange(MemRegion mr); | |
153 void clearAll(); | |
154 void clearRange(MemRegion mr); | |
155 | |
156 // Starting at the bit corresponding to "addr" (inclusive), find the next | |
157 // "1" bit, if any. This bit starts some run of consecutive "1"'s; find | |
158 // the end of this run (stopping at "end_addr"). Return the MemRegion | |
159 // covering from the start of the region corresponding to the first bit | |
160 // of the run to the end of the region corresponding to the last bit of | |
161 // the run. If there is no "1" bit at or after "addr", return an empty | |
162 // MemRegion. | |
163 MemRegion getAndClearMarkedRegion(HeapWord* addr, HeapWord* end_addr); | |
164 }; | |
165 | |
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166 // Represents a marking stack used by ConcurrentMarking in the G1 collector. |
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167 class CMMarkStack VALUE_OBJ_CLASS_SPEC { |
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168 VirtualSpace _virtual_space; // Underlying backing store for actual stack |
342 | 169 ConcurrentMark* _cm; |
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170 oop* _base; // bottom of stack |
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171 jint _index; // one more than last occupied index |
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172 jint _capacity; // max #elements |
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173 jint _saved_index; // value of _index saved at start of GC |
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174 NOT_PRODUCT(jint _max_depth;) // max depth plumbed during run |
342 | 175 |
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176 bool _overflow; |
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177 bool _should_expand; |
342 | 178 DEBUG_ONLY(bool _drain_in_progress;) |
179 DEBUG_ONLY(bool _drain_in_progress_yields;) | |
180 | |
181 public: | |
182 CMMarkStack(ConcurrentMark* cm); | |
183 ~CMMarkStack(); | |
184 | |
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185 #ifndef PRODUCT |
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186 jint max_depth() const { |
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187 return _max_depth; |
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188 } |
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189 #endif |
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190 |
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191 bool allocate(size_t capacity); |
342 | 192 |
193 oop pop() { | |
194 if (!isEmpty()) { | |
195 return _base[--_index] ; | |
196 } | |
197 return NULL; | |
198 } | |
199 | |
200 // If overflow happens, don't do the push, and record the overflow. | |
201 // *Requires* that "ptr" is already marked. | |
202 void push(oop ptr) { | |
203 if (isFull()) { | |
204 // Record overflow. | |
205 _overflow = true; | |
206 return; | |
207 } else { | |
208 _base[_index++] = ptr; | |
209 NOT_PRODUCT(_max_depth = MAX2(_max_depth, _index)); | |
210 } | |
211 } | |
212 // Non-block impl. Note: concurrency is allowed only with other | |
213 // "par_push" operations, not with "pop" or "drain". We would need | |
214 // parallel versions of them if such concurrency was desired. | |
215 void par_push(oop ptr); | |
216 | |
217 // Pushes the first "n" elements of "ptr_arr" on the stack. | |
218 // Non-block impl. Note: concurrency is allowed only with other | |
219 // "par_adjoin_arr" or "push" operations, not with "pop" or "drain". | |
220 void par_adjoin_arr(oop* ptr_arr, int n); | |
221 | |
222 // Pushes the first "n" elements of "ptr_arr" on the stack. | |
223 // Locking impl: concurrency is allowed only with | |
224 // "par_push_arr" and/or "par_pop_arr" operations, which use the same | |
225 // locking strategy. | |
226 void par_push_arr(oop* ptr_arr, int n); | |
227 | |
228 // If returns false, the array was empty. Otherwise, removes up to "max" | |
229 // elements from the stack, and transfers them to "ptr_arr" in an | |
230 // unspecified order. The actual number transferred is given in "n" ("n | |
231 // == 0" is deliberately redundant with the return value.) Locking impl: | |
232 // concurrency is allowed only with "par_push_arr" and/or "par_pop_arr" | |
233 // operations, which use the same locking strategy. | |
234 bool par_pop_arr(oop* ptr_arr, int max, int* n); | |
235 | |
236 // Drain the mark stack, applying the given closure to all fields of | |
237 // objects on the stack. (That is, continue until the stack is empty, | |
238 // even if closure applications add entries to the stack.) The "bm" | |
239 // argument, if non-null, may be used to verify that only marked objects | |
240 // are on the mark stack. If "yield_after" is "true", then the | |
241 // concurrent marker performing the drain offers to yield after | |
242 // processing each object. If a yield occurs, stops the drain operation | |
243 // and returns false. Otherwise, returns true. | |
244 template<class OopClosureClass> | |
245 bool drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after = false); | |
246 | |
247 bool isEmpty() { return _index == 0; } | |
248 bool isFull() { return _index == _capacity; } | |
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249 int maxElems() { return _capacity; } |
342 | 250 |
251 bool overflow() { return _overflow; } | |
252 void clear_overflow() { _overflow = false; } | |
253 | |
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254 bool should_expand() const { return _should_expand; } |
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255 void set_should_expand(); |
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256 |
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257 // Expand the stack, typically in response to an overflow condition |
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258 void expand(); |
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259 |
342 | 260 int size() { return _index; } |
261 | |
262 void setEmpty() { _index = 0; clear_overflow(); } | |
263 | |
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264 // Record the current index. |
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265 void note_start_of_gc(); |
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266 |
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267 // Make sure that we have not added any entries to the stack during GC. |
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268 void note_end_of_gc(); |
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269 |
342 | 270 // iterate over the oops in the mark stack, up to the bound recorded via |
271 // the call above. | |
272 void oops_do(OopClosure* f); | |
273 }; | |
274 | |
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275 class ForceOverflowSettings VALUE_OBJ_CLASS_SPEC { |
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276 private: |
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277 #ifndef PRODUCT |
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278 uintx _num_remaining; |
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279 bool _force; |
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280 #endif // !defined(PRODUCT) |
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281 |
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282 public: |
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283 void init() PRODUCT_RETURN; |
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284 void update() PRODUCT_RETURN; |
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285 bool should_force() PRODUCT_RETURN_( return false; ); |
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286 }; |
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287 |
342 | 288 // this will enable a variety of different statistics per GC task |
289 #define _MARKING_STATS_ 0 | |
290 // this will enable the higher verbose levels | |
291 #define _MARKING_VERBOSE_ 0 | |
292 | |
293 #if _MARKING_STATS_ | |
294 #define statsOnly(statement) \ | |
295 do { \ | |
296 statement ; \ | |
297 } while (0) | |
298 #else // _MARKING_STATS_ | |
299 #define statsOnly(statement) \ | |
300 do { \ | |
301 } while (0) | |
302 #endif // _MARKING_STATS_ | |
303 | |
304 typedef enum { | |
305 no_verbose = 0, // verbose turned off | |
306 stats_verbose, // only prints stats at the end of marking | |
307 low_verbose, // low verbose, mostly per region and per major event | |
308 medium_verbose, // a bit more detailed than low | |
309 high_verbose // per object verbose | |
310 } CMVerboseLevel; | |
311 | |
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312 class YoungList; |
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313 |
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314 // Root Regions are regions that are not empty at the beginning of a |
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315 // marking cycle and which we might collect during an evacuation pause |
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316 // while the cycle is active. Given that, during evacuation pauses, we |
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317 // do not copy objects that are explicitly marked, what we have to do |
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318 // for the root regions is to scan them and mark all objects reachable |
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319 // from them. According to the SATB assumptions, we only need to visit |
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320 // each object once during marking. So, as long as we finish this scan |
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321 // before the next evacuation pause, we can copy the objects from the |
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322 // root regions without having to mark them or do anything else to them. |
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323 // |
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324 // Currently, we only support root region scanning once (at the start |
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325 // of the marking cycle) and the root regions are all the survivor |
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326 // regions populated during the initial-mark pause. |
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327 class CMRootRegions VALUE_OBJ_CLASS_SPEC { |
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328 private: |
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329 YoungList* _young_list; |
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330 ConcurrentMark* _cm; |
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331 |
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332 volatile bool _scan_in_progress; |
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333 volatile bool _should_abort; |
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334 HeapRegion* volatile _next_survivor; |
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335 |
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336 public: |
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337 CMRootRegions(); |
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338 // We actually do most of the initialization in this method. |
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339 void init(G1CollectedHeap* g1h, ConcurrentMark* cm); |
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340 |
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341 // Reset the claiming / scanning of the root regions. |
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342 void prepare_for_scan(); |
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343 |
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344 // Forces get_next() to return NULL so that the iteration aborts early. |
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345 void abort() { _should_abort = true; } |
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346 |
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347 // Return true if the CM thread are actively scanning root regions, |
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348 // false otherwise. |
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349 bool scan_in_progress() { return _scan_in_progress; } |
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350 |
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351 // Claim the next root region to scan atomically, or return NULL if |
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352 // all have been claimed. |
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353 HeapRegion* claim_next(); |
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354 |
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355 // Flag that we're done with root region scanning and notify anyone |
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356 // who's waiting on it. If aborted is false, assume that all regions |
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357 // have been claimed. |
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358 void scan_finished(); |
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359 |
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360 // If CM threads are still scanning root regions, wait until they |
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361 // are done. Return true if we had to wait, false otherwise. |
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362 bool wait_until_scan_finished(); |
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363 }; |
342 | 364 |
365 class ConcurrentMarkThread; | |
366 | |
6197 | 367 class ConcurrentMark: public CHeapObj<mtGC> { |
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368 friend class CMMarkStack; |
342 | 369 friend class ConcurrentMarkThread; |
370 friend class CMTask; | |
371 friend class CMBitMapClosure; | |
372 friend class CMGlobalObjectClosure; | |
373 friend class CMRemarkTask; | |
374 friend class CMConcurrentMarkingTask; | |
375 friend class G1ParNoteEndTask; | |
376 friend class CalcLiveObjectsClosure; | |
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377 friend class G1CMRefProcTaskProxy; |
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378 friend class G1CMRefProcTaskExecutor; |
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379 friend class G1CMKeepAliveAndDrainClosure; |
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380 friend class G1CMDrainMarkingStackClosure; |
342 | 381 |
382 protected: | |
383 ConcurrentMarkThread* _cmThread; // the thread doing the work | |
384 G1CollectedHeap* _g1h; // the heap. | |
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385 uint _parallel_marking_threads; // the number of marking |
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386 // threads we're use |
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387 uint _max_parallel_marking_threads; // max number of marking |
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388 // threads we'll ever use |
342 | 389 double _sleep_factor; // how much we have to sleep, with |
390 // respect to the work we just did, to | |
391 // meet the marking overhead goal | |
392 double _marking_task_overhead; // marking target overhead for | |
393 // a single task | |
394 | |
395 // same as the two above, but for the cleanup task | |
396 double _cleanup_sleep_factor; | |
397 double _cleanup_task_overhead; | |
398 | |
2152 | 399 FreeRegionList _cleanup_list; |
342 | 400 |
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401 // Concurrent marking support structures |
342 | 402 CMBitMap _markBitMap1; |
403 CMBitMap _markBitMap2; | |
404 CMBitMapRO* _prevMarkBitMap; // completed mark bitmap | |
405 CMBitMap* _nextMarkBitMap; // under-construction mark bitmap | |
406 | |
407 BitMap _region_bm; | |
408 BitMap _card_bm; | |
409 | |
410 // Heap bounds | |
411 HeapWord* _heap_start; | |
412 HeapWord* _heap_end; | |
413 | |
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414 // Root region tracking and claiming. |
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415 CMRootRegions _root_regions; |
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416 |
342 | 417 // For gray objects |
418 CMMarkStack _markStack; // Grey objects behind global finger. | |
419 HeapWord* volatile _finger; // the global finger, region aligned, | |
420 // always points to the end of the | |
421 // last claimed region | |
422 | |
423 // marking tasks | |
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424 uint _max_worker_id;// maximum worker id |
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425 uint _active_tasks; // task num currently active |
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426 CMTask** _tasks; // task queue array (max_worker_id len) |
342 | 427 CMTaskQueueSet* _task_queues; // task queue set |
428 ParallelTaskTerminator _terminator; // for termination | |
429 | |
430 // Two sync barriers that are used to synchronise tasks when an | |
431 // overflow occurs. The algorithm is the following. All tasks enter | |
432 // the first one to ensure that they have all stopped manipulating | |
433 // the global data structures. After they exit it, they re-initialise | |
434 // their data structures and task 0 re-initialises the global data | |
435 // structures. Then, they enter the second sync barrier. This | |
436 // ensure, that no task starts doing work before all data | |
437 // structures (local and global) have been re-initialised. When they | |
438 // exit it, they are free to start working again. | |
439 WorkGangBarrierSync _first_overflow_barrier_sync; | |
440 WorkGangBarrierSync _second_overflow_barrier_sync; | |
441 | |
442 // this is set by any task, when an overflow on the global data | |
443 // structures is detected. | |
444 volatile bool _has_overflown; | |
445 // true: marking is concurrent, false: we're in remark | |
446 volatile bool _concurrent; | |
447 // set at the end of a Full GC so that marking aborts | |
448 volatile bool _has_aborted; | |
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449 GCId _aborted_gc_id; |
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450 |
342 | 451 // used when remark aborts due to an overflow to indicate that |
452 // another concurrent marking phase should start | |
453 volatile bool _restart_for_overflow; | |
454 | |
455 // This is true from the very start of concurrent marking until the | |
456 // point when all the tasks complete their work. It is really used | |
457 // to determine the points between the end of concurrent marking and | |
458 // time of remark. | |
459 volatile bool _concurrent_marking_in_progress; | |
460 | |
461 // verbose level | |
462 CMVerboseLevel _verbose_level; | |
463 | |
464 // All of these times are in ms. | |
465 NumberSeq _init_times; | |
466 NumberSeq _remark_times; | |
467 NumberSeq _remark_mark_times; | |
468 NumberSeq _remark_weak_ref_times; | |
469 NumberSeq _cleanup_times; | |
470 double _total_counting_time; | |
471 double _total_rs_scrub_time; | |
472 | |
473 double* _accum_task_vtime; // accumulated task vtime | |
474 | |
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475 FlexibleWorkGang* _parallel_workers; |
342 | 476 |
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477 ForceOverflowSettings _force_overflow_conc; |
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478 ForceOverflowSettings _force_overflow_stw; |
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479 |
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480 void weakRefsWorkParallelPart(BoolObjectClosure* is_alive, bool purged_classes); |
342 | 481 void weakRefsWork(bool clear_all_soft_refs); |
482 | |
483 void swapMarkBitMaps(); | |
484 | |
485 // It resets the global marking data structures, as well as the | |
486 // task local ones; should be called during initial mark. | |
487 void reset(); | |
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488 |
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489 // Resets all the marking data structures. Called when we have to restart |
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490 // marking or when marking completes (via set_non_marking_state below). |
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491 void reset_marking_state(bool clear_overflow = true); |
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492 |
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493 // We do this after we're done with marking so that the marking data |
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494 // structures are initialised to a sensible and predictable state. |
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495 void set_non_marking_state(); |
342 | 496 |
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497 // Called to indicate how many threads are currently active. |
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498 void set_concurrency(uint active_tasks); |
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499 |
342 | 500 // It should be called to indicate which phase we're in (concurrent |
501 // mark or remark) and how many threads are currently active. | |
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502 void set_concurrency_and_phase(uint active_tasks, bool concurrent); |
342 | 503 |
504 // prints all gathered CM-related statistics | |
505 void print_stats(); | |
506 | |
2152 | 507 bool cleanup_list_is_empty() { |
508 return _cleanup_list.is_empty(); | |
509 } | |
510 | |
342 | 511 // accessor methods |
8008
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512 uint parallel_marking_threads() const { return _parallel_marking_threads; } |
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513 uint max_parallel_marking_threads() const { return _max_parallel_marking_threads;} |
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514 double sleep_factor() { return _sleep_factor; } |
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515 double marking_task_overhead() { return _marking_task_overhead;} |
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516 double cleanup_sleep_factor() { return _cleanup_sleep_factor; } |
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517 double cleanup_task_overhead() { return _cleanup_task_overhead;} |
342 | 518 |
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519 bool use_parallel_marking_threads() const { |
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520 assert(parallel_marking_threads() <= |
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521 max_parallel_marking_threads(), "sanity"); |
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522 assert((_parallel_workers == NULL && parallel_marking_threads() == 0) || |
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523 parallel_marking_threads() > 0, |
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524 "parallel workers not set up correctly"); |
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525 return _parallel_workers != NULL; |
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526 } |
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527 |
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528 HeapWord* finger() { return _finger; } |
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529 bool concurrent() { return _concurrent; } |
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530 uint active_tasks() { return _active_tasks; } |
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531 ParallelTaskTerminator* terminator() { return &_terminator; } |
342 | 532 |
533 // It claims the next available region to be scanned by a marking | |
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534 // task/thread. It might return NULL if the next region is empty or |
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535 // we have run out of regions. In the latter case, out_of_regions() |
342 | 536 // determines whether we've really run out of regions or the task |
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537 // should call claim_region() again. This might seem a bit |
342 | 538 // awkward. Originally, the code was written so that claim_region() |
539 // either successfully returned with a non-empty region or there | |
540 // were no more regions to be claimed. The problem with this was | |
541 // that, in certain circumstances, it iterated over large chunks of | |
542 // the heap finding only empty regions and, while it was working, it | |
543 // was preventing the calling task to call its regular clock | |
544 // method. So, this way, each task will spend very little time in | |
545 // claim_region() and is allowed to call the regular clock method | |
546 // frequently. | |
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547 HeapRegion* claim_region(uint worker_id); |
342 | 548 |
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549 // It determines whether we've run out of regions to scan. Note that |
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550 // the finger can point past the heap end in case the heap was expanded |
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551 // to satisfy an allocation without doing a GC. This is fine, because all |
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552 // objects in those regions will be considered live anyway because of |
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553 // SATB guarantees (i.e. their TAMS will be equal to bottom). |
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554 bool out_of_regions() { return _finger >= _heap_end; } |
342 | 555 |
556 // Returns the task with the given id | |
557 CMTask* task(int id) { | |
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558 assert(0 <= id && id < (int) _active_tasks, |
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559 "task id not within active bounds"); |
342 | 560 return _tasks[id]; |
561 } | |
562 | |
563 // Returns the task queue with the given id | |
564 CMTaskQueue* task_queue(int id) { | |
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565 assert(0 <= id && id < (int) _active_tasks, |
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566 "task queue id not within active bounds"); |
342 | 567 return (CMTaskQueue*) _task_queues->queue(id); |
568 } | |
569 | |
570 // Returns the task queue set | |
571 CMTaskQueueSet* task_queues() { return _task_queues; } | |
572 | |
573 // Access / manipulation of the overflow flag which is set to | |
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574 // indicate that the global stack has overflown |
342 | 575 bool has_overflown() { return _has_overflown; } |
576 void set_has_overflown() { _has_overflown = true; } | |
577 void clear_has_overflown() { _has_overflown = false; } | |
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578 bool restart_for_overflow() { return _restart_for_overflow; } |
342 | 579 |
580 // Methods to enter the two overflow sync barriers | |
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581 void enter_first_sync_barrier(uint worker_id); |
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582 void enter_second_sync_barrier(uint worker_id); |
342 | 583 |
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584 ForceOverflowSettings* force_overflow_conc() { |
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585 return &_force_overflow_conc; |
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586 } |
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587 |
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588 ForceOverflowSettings* force_overflow_stw() { |
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589 return &_force_overflow_stw; |
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590 } |
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591 |
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592 ForceOverflowSettings* force_overflow() { |
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593 if (concurrent()) { |
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594 return force_overflow_conc(); |
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595 } else { |
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596 return force_overflow_stw(); |
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597 } |
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598 } |
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599 |
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600 // Live Data Counting data structures... |
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601 // These data structures are initialized at the start of |
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602 // marking. They are written to while marking is active. |
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603 // They are aggregated during remark; the aggregated values |
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604 // are then used to populate the _region_bm, _card_bm, and |
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605 // the total live bytes, which are then subsequently updated |
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606 // during cleanup. |
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607 |
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608 // An array of bitmaps (one bit map per task). Each bitmap |
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609 // is used to record the cards spanned by the live objects |
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610 // marked by that task/worker. |
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611 BitMap* _count_card_bitmaps; |
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612 |
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613 // Used to record the number of marked live bytes |
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614 // (for each region, by worker thread). |
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615 size_t** _count_marked_bytes; |
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616 |
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617 // Card index of the bottom of the G1 heap. Used for biasing indices into |
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618 // the card bitmaps. |
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619 intptr_t _heap_bottom_card_num; |
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620 |
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621 // Set to true when initialization is complete |
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622 bool _completed_initialization; |
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623 |
342 | 624 public: |
625 // Manipulation of the global mark stack. | |
626 // Notice that the first mark_stack_push is CAS-based, whereas the | |
627 // two below are Mutex-based. This is OK since the first one is only | |
628 // called during evacuation pauses and doesn't compete with the | |
629 // other two (which are called by the marking tasks during | |
630 // concurrent marking or remark). | |
631 bool mark_stack_push(oop p) { | |
632 _markStack.par_push(p); | |
633 if (_markStack.overflow()) { | |
634 set_has_overflown(); | |
635 return false; | |
636 } | |
637 return true; | |
638 } | |
639 bool mark_stack_push(oop* arr, int n) { | |
640 _markStack.par_push_arr(arr, n); | |
641 if (_markStack.overflow()) { | |
642 set_has_overflown(); | |
643 return false; | |
644 } | |
645 return true; | |
646 } | |
647 void mark_stack_pop(oop* arr, int max, int* n) { | |
648 _markStack.par_pop_arr(arr, max, n); | |
649 } | |
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650 size_t mark_stack_size() { return _markStack.size(); } |
342 | 651 size_t partial_mark_stack_size_target() { return _markStack.maxElems()/3; } |
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652 bool mark_stack_overflow() { return _markStack.overflow(); } |
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653 bool mark_stack_empty() { return _markStack.isEmpty(); } |
342 | 654 |
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655 CMRootRegions* root_regions() { return &_root_regions; } |
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656 |
342 | 657 bool concurrent_marking_in_progress() { |
658 return _concurrent_marking_in_progress; | |
659 } | |
660 void set_concurrent_marking_in_progress() { | |
661 _concurrent_marking_in_progress = true; | |
662 } | |
663 void clear_concurrent_marking_in_progress() { | |
664 _concurrent_marking_in_progress = false; | |
665 } | |
666 | |
667 void update_accum_task_vtime(int i, double vtime) { | |
668 _accum_task_vtime[i] += vtime; | |
669 } | |
670 | |
671 double all_task_accum_vtime() { | |
672 double ret = 0.0; | |
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673 for (uint i = 0; i < _max_worker_id; ++i) |
342 | 674 ret += _accum_task_vtime[i]; |
675 return ret; | |
676 } | |
677 | |
678 // Attempts to steal an object from the task queues of other tasks | |
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679 bool try_stealing(uint worker_id, int* hash_seed, oop& obj) { |
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680 return _task_queues->steal(worker_id, hash_seed, obj); |
342 | 681 } |
682 | |
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683 ConcurrentMark(G1CollectedHeap* g1h, ReservedSpace heap_rs); |
342 | 684 ~ConcurrentMark(); |
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685 |
342 | 686 ConcurrentMarkThread* cmThread() { return _cmThread; } |
687 | |
688 CMBitMapRO* prevMarkBitMap() const { return _prevMarkBitMap; } | |
689 CMBitMap* nextMarkBitMap() const { return _nextMarkBitMap; } | |
690 | |
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691 // Returns the number of GC threads to be used in a concurrent |
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692 // phase based on the number of GC threads being used in a STW |
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693 // phase. |
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694 uint scale_parallel_threads(uint n_par_threads); |
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695 |
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696 // Calculates the number of GC threads to be used in a concurrent phase. |
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697 uint calc_parallel_marking_threads(); |
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698 |
342 | 699 // The following three are interaction between CM and |
700 // G1CollectedHeap | |
701 | |
702 // This notifies CM that a root during initial-mark needs to be | |
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703 // grayed. It is MT-safe. word_size is the size of the object in |
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704 // words. It is passed explicitly as sometimes we cannot calculate |
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705 // it from the given object because it might be in an inconsistent |
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706 // state (e.g., in to-space and being copied). So the caller is |
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707 // responsible for dealing with this issue (e.g., get the size from |
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708 // the from-space image when the to-space image might be |
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709 // inconsistent) and always passing the size. hr is the region that |
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710 // contains the object and it's passed optionally from callers who |
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711 // might already have it (no point in recalculating it). |
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712 inline void grayRoot(oop obj, size_t word_size, |
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713 uint worker_id, HeapRegion* hr = NULL); |
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714 |
1388 | 715 // It iterates over the heap and for each object it comes across it |
716 // will dump the contents of its reference fields, as well as | |
717 // liveness information for the object and its referents. The dump | |
718 // will be written to a file with the following name: | |
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719 // G1PrintReachableBaseFile + "." + str. |
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720 // vo decides whether the prev (vo == UsePrevMarking), the next |
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721 // (vo == UseNextMarking) marking information, or the mark word |
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722 // (vo == UseMarkWord) will be used to determine the liveness of |
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723 // each object / referent. |
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724 // If all is true, all objects in the heap will be dumped, otherwise |
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725 // only the live ones. In the dump the following symbols / breviations |
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726 // are used: |
1388 | 727 // M : an explicitly live object (its bitmap bit is set) |
728 // > : an implicitly live object (over tams) | |
729 // O : an object outside the G1 heap (typically: in the perm gen) | |
730 // NOT : a reference field whose referent is not live | |
731 // AND MARKED : indicates that an object is both explicitly and | |
732 // implicitly live (it should be one or the other, not both) | |
733 void print_reachable(const char* str, | |
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734 VerifyOption vo, bool all) PRODUCT_RETURN; |
342 | 735 |
736 // Clear the next marking bitmap (will be called concurrently). | |
737 void clearNextBitmap(); | |
738 | |
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739 // Return whether the next mark bitmap has no marks set. |
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740 bool nextMarkBitmapIsClear(); |
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741 |
342 | 742 // These two do the work that needs to be done before and after the |
743 // initial root checkpoint. Since this checkpoint can be done at two | |
744 // different points (i.e. an explicit pause or piggy-backed on a | |
745 // young collection), then it's nice to be able to easily share the | |
746 // pre/post code. It might be the case that we can put everything in | |
747 // the post method. TP | |
748 void checkpointRootsInitialPre(); | |
749 void checkpointRootsInitialPost(); | |
750 | |
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751 // Scan all the root regions and mark everything reachable from |
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752 // them. |
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753 void scanRootRegions(); |
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754 |
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755 // Scan a single root region and mark everything reachable from it. |
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756 void scanRootRegion(HeapRegion* hr, uint worker_id); |
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757 |
342 | 758 // Do concurrent phase of marking, to a tentative transitive closure. |
759 void markFromRoots(); | |
760 | |
761 void checkpointRootsFinal(bool clear_all_soft_refs); | |
762 void checkpointRootsFinalWork(); | |
763 void cleanup(); | |
764 void completeCleanup(); | |
765 | |
766 // Mark in the previous bitmap. NB: this is usually read-only, so use | |
767 // this carefully! | |
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768 inline void markPrev(oop p); |
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769 |
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770 // Clears marks for all objects in the given range, for the prev, |
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771 // next, or both bitmaps. NB: the previous bitmap is usually |
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772 // read-only, so use this carefully! |
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773 void clearRangePrevBitmap(MemRegion mr); |
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774 void clearRangeNextBitmap(MemRegion mr); |
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775 void clearRangeBothBitmaps(MemRegion mr); |
342 | 776 |
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777 // Notify data structures that a GC has started. |
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778 void note_start_of_gc() { |
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779 _markStack.note_start_of_gc(); |
342 | 780 } |
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781 |
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782 // Notify data structures that a GC is finished. |
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783 void note_end_of_gc() { |
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784 _markStack.note_end_of_gc(); |
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785 } |
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786 |
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787 // Verify that there are no CSet oops on the stacks (taskqueues / |
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788 // global mark stack), enqueued SATB buffers, per-thread SATB |
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789 // buffers, and fingers (global / per-task). The boolean parameters |
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790 // decide which of the above data structures to verify. If marking |
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791 // is not in progress, it's a no-op. |
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792 void verify_no_cset_oops(bool verify_stacks, |
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793 bool verify_enqueued_buffers, |
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794 bool verify_thread_buffers, |
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795 bool verify_fingers) PRODUCT_RETURN; |
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796 |
342 | 797 // It is called at the end of an evacuation pause during marking so |
798 // that CM is notified of where the new end of the heap is. It | |
799 // doesn't do anything if concurrent_marking_in_progress() is false, | |
800 // unless the force parameter is true. | |
801 void update_g1_committed(bool force = false); | |
802 | |
803 bool isMarked(oop p) const { | |
804 assert(p != NULL && p->is_oop(), "expected an oop"); | |
805 HeapWord* addr = (HeapWord*)p; | |
806 assert(addr >= _nextMarkBitMap->startWord() || | |
807 addr < _nextMarkBitMap->endWord(), "in a region"); | |
808 | |
809 return _nextMarkBitMap->isMarked(addr); | |
810 } | |
811 | |
812 inline bool not_yet_marked(oop p) const; | |
813 | |
814 // XXX Debug code | |
815 bool containing_card_is_marked(void* p); | |
816 bool containing_cards_are_marked(void* start, void* last); | |
817 | |
818 bool isPrevMarked(oop p) const { | |
819 assert(p != NULL && p->is_oop(), "expected an oop"); | |
820 HeapWord* addr = (HeapWord*)p; | |
821 assert(addr >= _prevMarkBitMap->startWord() || | |
822 addr < _prevMarkBitMap->endWord(), "in a region"); | |
823 | |
824 return _prevMarkBitMap->isMarked(addr); | |
825 } | |
826 | |
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827 inline bool do_yield_check(uint worker_i = 0); |
342 | 828 |
829 // Called to abort the marking cycle after a Full GC takes palce. | |
830 void abort(); | |
831 | |
10405 | 832 bool has_aborted() { return _has_aborted; } |
833 | |
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834 const GCId& concurrent_gc_id(); |
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835 |
342 | 836 // This prints the global/local fingers. It is used for debugging. |
837 NOT_PRODUCT(void print_finger();) | |
838 | |
839 void print_summary_info(); | |
840 | |
1019 | 841 void print_worker_threads_on(outputStream* st) const; |
842 | |
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843 void print_on_error(outputStream* st) const; |
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844 |
342 | 845 // The following indicate whether a given verbose level has been |
846 // set. Notice that anything above stats is conditional to | |
847 // _MARKING_VERBOSE_ having been set to 1 | |
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848 bool verbose_stats() { |
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849 return _verbose_level >= stats_verbose; |
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850 } |
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851 bool verbose_low() { |
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852 return _MARKING_VERBOSE_ && _verbose_level >= low_verbose; |
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853 } |
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854 bool verbose_medium() { |
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855 return _MARKING_VERBOSE_ && _verbose_level >= medium_verbose; |
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856 } |
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857 bool verbose_high() { |
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858 return _MARKING_VERBOSE_ && _verbose_level >= high_verbose; |
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859 } |
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860 |
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861 // Liveness counting |
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862 |
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863 // Utility routine to set an exclusive range of cards on the given |
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864 // card liveness bitmap |
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865 inline void set_card_bitmap_range(BitMap* card_bm, |
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866 BitMap::idx_t start_idx, |
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867 BitMap::idx_t end_idx, |
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868 bool is_par); |
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869 |
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870 // Returns the card number of the bottom of the G1 heap. |
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871 // Used in biasing indices into accounting card bitmaps. |
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872 intptr_t heap_bottom_card_num() const { |
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873 return _heap_bottom_card_num; |
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874 } |
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875 |
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876 // Returns the card bitmap for a given task or worker id. |
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877 BitMap* count_card_bitmap_for(uint worker_id) { |
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878 assert(0 <= worker_id && worker_id < _max_worker_id, "oob"); |
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879 assert(_count_card_bitmaps != NULL, "uninitialized"); |
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880 BitMap* task_card_bm = &_count_card_bitmaps[worker_id]; |
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881 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
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882 return task_card_bm; |
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883 } |
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884 |
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885 // Returns the array containing the marked bytes for each region, |
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886 // for the given worker or task id. |
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887 size_t* count_marked_bytes_array_for(uint worker_id) { |
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888 assert(0 <= worker_id && worker_id < _max_worker_id, "oob"); |
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889 assert(_count_marked_bytes != NULL, "uninitialized"); |
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890 size_t* marked_bytes_array = _count_marked_bytes[worker_id]; |
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891 assert(marked_bytes_array != NULL, "uninitialized"); |
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892 return marked_bytes_array; |
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893 } |
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894 |
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895 // Returns the index in the liveness accounting card table bitmap |
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896 // for the given address |
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897 inline BitMap::idx_t card_bitmap_index_for(HeapWord* addr); |
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898 |
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899 // Counts the size of the given memory region in the the given |
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900 // marked_bytes array slot for the given HeapRegion. |
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901 // Sets the bits in the given card bitmap that are associated with the |
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902 // cards that are spanned by the memory region. |
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903 inline void count_region(MemRegion mr, HeapRegion* hr, |
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904 size_t* marked_bytes_array, |
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905 BitMap* task_card_bm); |
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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, HeapRegion* hr, uint worker_id); |
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910 |
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911 // Counts the given memory region in the task/worker counting |
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912 // data structures for the given worker id. |
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913 inline void count_region(MemRegion mr, uint worker_id); |
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914 |
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915 // Counts the given object in the given task/worker counting |
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916 // data structures. |
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917 inline void count_object(oop obj, HeapRegion* hr, |
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918 size_t* marked_bytes_array, |
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919 BitMap* task_card_bm); |
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920 |
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921 // Counts the given object in the task/worker counting data |
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922 // structures for the given worker id. |
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923 inline void count_object(oop obj, 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 given task/worker counting structures. |
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927 inline bool par_mark_and_count(oop obj, HeapRegion* hr, |
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928 size_t* marked_bytes_array, |
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929 BitMap* task_card_bm); |
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930 |
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931 // Attempts to mark the given object and, if successful, counts |
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932 // the object in the task/worker counting structures for the |
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933 // given worker id. |
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934 inline bool par_mark_and_count(oop obj, size_t word_size, |
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935 HeapRegion* hr, uint worker_id); |
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936 |
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937 // Attempts to mark the given object and, if successful, counts |
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938 // the object in the task/worker counting structures for the |
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939 // given worker id. |
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940 inline bool par_mark_and_count(oop obj, HeapRegion* hr, uint worker_id); |
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941 |
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942 // Similar to the above routine but we don't know the heap region that |
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943 // contains the object to be marked/counted, which this routine looks up. |
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944 inline bool par_mark_and_count(oop obj, uint worker_id); |
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945 |
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946 // Similar to the above routine but there are times when we cannot |
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947 // safely calculate the size of obj due to races and we, therefore, |
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948 // pass the size in as a parameter. It is the caller's reponsibility |
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949 // to ensure that the size passed in for obj is valid. |
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950 inline bool par_mark_and_count(oop obj, size_t word_size, uint worker_id); |
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951 |
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952 // Unconditionally mark the given object, and unconditinally count |
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953 // the object in the counting structures for worker id 0. |
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954 // Should *not* be called from parallel code. |
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955 inline bool mark_and_count(oop obj, HeapRegion* hr); |
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956 |
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957 // Similar to the above routine but we don't know the heap region that |
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958 // contains the object to be marked/counted, which this routine looks up. |
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959 // Should *not* be called from parallel code. |
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960 inline bool mark_and_count(oop obj); |
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961 |
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962 // Returns true if initialization was successfully completed. |
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963 bool completed_initialization() const { |
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964 return _completed_initialization; |
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965 } |
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966 |
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967 protected: |
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968 // Clear all the per-task bitmaps and arrays used to store the |
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969 // counting data. |
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970 void clear_all_count_data(); |
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971 |
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972 // Aggregates the counting data for each worker/task |
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973 // that was constructed while marking. Also sets |
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974 // the amount of marked bytes for each region and |
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975 // the top at concurrent mark count. |
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976 void aggregate_count_data(); |
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977 |
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978 // Verification routine |
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979 void verify_count_data(); |
342 | 980 }; |
981 | |
982 // A class representing a marking task. | |
983 class CMTask : public TerminatorTerminator { | |
984 private: | |
985 enum PrivateConstants { | |
986 // the regular clock call is called once the scanned words reaches | |
987 // this limit | |
988 words_scanned_period = 12*1024, | |
989 // the regular clock call is called once the number of visited | |
990 // references reaches this limit | |
991 refs_reached_period = 384, | |
992 // initial value for the hash seed, used in the work stealing code | |
993 init_hash_seed = 17, | |
994 // how many entries will be transferred between global stack and | |
995 // local queues | |
996 global_stack_transfer_size = 16 | |
997 }; | |
998 | |
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999 uint _worker_id; |
342 | 1000 G1CollectedHeap* _g1h; |
1001 ConcurrentMark* _cm; | |
1002 CMBitMap* _nextMarkBitMap; | |
1003 // the task queue of this task | |
1004 CMTaskQueue* _task_queue; | |
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1005 private: |
342 | 1006 // the task queue set---needed for stealing |
1007 CMTaskQueueSet* _task_queues; | |
1008 // indicates whether the task has been claimed---this is only for | |
1009 // debugging purposes | |
1010 bool _claimed; | |
1011 | |
1012 // number of calls to this task | |
1013 int _calls; | |
1014 | |
1015 // when the virtual timer reaches this time, the marking step should | |
1016 // exit | |
1017 double _time_target_ms; | |
1018 // the start time of the current marking step | |
1019 double _start_time_ms; | |
1020 | |
1021 // the oop closure used for iterations over oops | |
3771 | 1022 G1CMOopClosure* _cm_oop_closure; |
342 | 1023 |
1024 // the region this task is scanning, NULL if we're not scanning any | |
1025 HeapRegion* _curr_region; | |
1026 // the local finger of this task, NULL if we're not scanning a region | |
1027 HeapWord* _finger; | |
1028 // limit of the region this task is scanning, NULL if we're not scanning one | |
1029 HeapWord* _region_limit; | |
1030 | |
1031 // the number of words this task has scanned | |
1032 size_t _words_scanned; | |
1033 // When _words_scanned reaches this limit, the regular clock is | |
1034 // called. Notice that this might be decreased under certain | |
1035 // circumstances (i.e. when we believe that we did an expensive | |
1036 // operation). | |
1037 size_t _words_scanned_limit; | |
1038 // the initial value of _words_scanned_limit (i.e. what it was | |
1039 // before it was decreased). | |
1040 size_t _real_words_scanned_limit; | |
1041 | |
1042 // the number of references this task has visited | |
1043 size_t _refs_reached; | |
1044 // When _refs_reached reaches this limit, the regular clock is | |
1045 // called. Notice this this might be decreased under certain | |
1046 // circumstances (i.e. when we believe that we did an expensive | |
1047 // operation). | |
1048 size_t _refs_reached_limit; | |
1049 // the initial value of _refs_reached_limit (i.e. what it was before | |
1050 // it was decreased). | |
1051 size_t _real_refs_reached_limit; | |
1052 | |
1053 // used by the work stealing stuff | |
1054 int _hash_seed; | |
1055 // if this is true, then the task has aborted for some reason | |
1056 bool _has_aborted; | |
1057 // set when the task aborts because it has met its time quota | |
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1058 bool _has_timed_out; |
342 | 1059 // true when we're draining SATB buffers; this avoids the task |
1060 // aborting due to SATB buffers being available (as we're already | |
1061 // dealing with them) | |
1062 bool _draining_satb_buffers; | |
1063 | |
1064 // number sequence of past step times | |
1065 NumberSeq _step_times_ms; | |
1066 // elapsed time of this task | |
1067 double _elapsed_time_ms; | |
1068 // termination time of this task | |
1069 double _termination_time_ms; | |
1070 // when this task got into the termination protocol | |
1071 double _termination_start_time_ms; | |
1072 | |
1073 // true when the task is during a concurrent phase, false when it is | |
1074 // in the remark phase (so, in the latter case, we do not have to | |
1075 // check all the things that we have to check during the concurrent | |
1076 // phase, i.e. SATB buffer availability...) | |
1077 bool _concurrent; | |
1078 | |
1079 TruncatedSeq _marking_step_diffs_ms; | |
1080 | |
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1081 // Counting data structures. Embedding the task's marked_bytes_array |
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1082 // and card bitmap into the actual task saves having to go through |
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1083 // the ConcurrentMark object. |
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1084 size_t* _marked_bytes_array; |
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1085 BitMap* _card_bm; |
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1086 |
342 | 1087 // LOTS of statistics related with this task |
1088 #if _MARKING_STATS_ | |
1089 NumberSeq _all_clock_intervals_ms; | |
1090 double _interval_start_time_ms; | |
1091 | |
1092 int _aborted; | |
1093 int _aborted_overflow; | |
1094 int _aborted_cm_aborted; | |
1095 int _aborted_yield; | |
1096 int _aborted_timed_out; | |
1097 int _aborted_satb; | |
1098 int _aborted_termination; | |
1099 | |
1100 int _steal_attempts; | |
1101 int _steals; | |
1102 | |
1103 int _clock_due_to_marking; | |
1104 int _clock_due_to_scanning; | |
1105 | |
1106 int _local_pushes; | |
1107 int _local_pops; | |
1108 int _local_max_size; | |
1109 int _objs_scanned; | |
1110 | |
1111 int _global_pushes; | |
1112 int _global_pops; | |
1113 int _global_max_size; | |
1114 | |
1115 int _global_transfers_to; | |
1116 int _global_transfers_from; | |
1117 | |
1118 int _regions_claimed; | |
1119 int _objs_found_on_bitmap; | |
1120 | |
1121 int _satb_buffers_processed; | |
1122 #endif // _MARKING_STATS_ | |
1123 | |
1124 // it updates the local fields after this task has claimed | |
1125 // a new region to scan | |
1126 void setup_for_region(HeapRegion* hr); | |
1127 // it brings up-to-date the limit of the region | |
1128 void update_region_limit(); | |
1129 | |
1130 // called when either the words scanned or the refs visited limit | |
1131 // has been reached | |
1132 void reached_limit(); | |
1133 // recalculates the words scanned and refs visited limits | |
1134 void recalculate_limits(); | |
1135 // decreases the words scanned and refs visited limits when we reach | |
1136 // an expensive operation | |
1137 void decrease_limits(); | |
1138 // it checks whether the words scanned or refs visited reached their | |
1139 // respective limit and calls reached_limit() if they have | |
1140 void check_limits() { | |
1141 if (_words_scanned >= _words_scanned_limit || | |
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1142 _refs_reached >= _refs_reached_limit) { |
342 | 1143 reached_limit(); |
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1144 } |
342 | 1145 } |
1146 // this is supposed to be called regularly during a marking step as | |
1147 // it checks a bunch of conditions that might cause the marking step | |
1148 // to abort | |
1149 void regular_clock_call(); | |
1150 bool concurrent() { return _concurrent; } | |
1151 | |
1152 public: | |
1153 // It resets the task; it should be called right at the beginning of | |
1154 // a marking phase. | |
1155 void reset(CMBitMap* _nextMarkBitMap); | |
1156 // it clears all the fields that correspond to a claimed region. | |
1157 void clear_region_fields(); | |
1158 | |
1159 void set_concurrent(bool concurrent) { _concurrent = concurrent; } | |
1160 | |
1161 // The main method of this class which performs a marking step | |
1162 // trying not to exceed the given duration. However, it might exit | |
1163 // prematurely, according to some conditions (i.e. SATB buffers are | |
1164 // available for processing). | |
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1165 void do_marking_step(double target_ms, |
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1166 bool do_termination, |
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1167 bool is_serial); |
342 | 1168 |
1169 // These two calls start and stop the timer | |
1170 void record_start_time() { | |
1171 _elapsed_time_ms = os::elapsedTime() * 1000.0; | |
1172 } | |
1173 void record_end_time() { | |
1174 _elapsed_time_ms = os::elapsedTime() * 1000.0 - _elapsed_time_ms; | |
1175 } | |
1176 | |
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1177 // returns the worker ID associated with this task. |
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1178 uint worker_id() { return _worker_id; } |
342 | 1179 |
1180 // From TerminatorTerminator. It determines whether this task should | |
1181 // exit the termination protocol after it's entered it. | |
1182 virtual bool should_exit_termination(); | |
1183 | |
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1184 // Resets the local region fields after a task has finished scanning a |
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1185 // region; or when they have become stale as a result of the region |
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1186 // being evacuated. |
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1187 void giveup_current_region(); |
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1188 |
342 | 1189 HeapWord* finger() { return _finger; } |
1190 | |
1191 bool has_aborted() { return _has_aborted; } | |
1192 void set_has_aborted() { _has_aborted = true; } | |
1193 void clear_has_aborted() { _has_aborted = false; } | |
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1194 bool has_timed_out() { return _has_timed_out; } |
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1195 bool claimed() { return _claimed; } |
342 | 1196 |
3771 | 1197 void set_cm_oop_closure(G1CMOopClosure* cm_oop_closure); |
342 | 1198 |
1199 // It grays the object by marking it and, if necessary, pushing it | |
1200 // on the local queue | |
3771 | 1201 inline void deal_with_reference(oop obj); |
342 | 1202 |
1203 // It scans an object and visits its children. | |
3771 | 1204 void scan_object(oop obj); |
342 | 1205 |
1206 // It pushes an object on the local queue. | |
3771 | 1207 inline void push(oop obj); |
342 | 1208 |
1209 // These two move entries to/from the global stack. | |
1210 void move_entries_to_global_stack(); | |
1211 void get_entries_from_global_stack(); | |
1212 | |
1213 // It pops and scans objects from the local queue. If partially is | |
1214 // true, then it stops when the queue size is of a given limit. If | |
1215 // partially is false, then it stops when the queue is empty. | |
1216 void drain_local_queue(bool partially); | |
1217 // It moves entries from the global stack to the local queue and | |
1218 // drains the local queue. If partially is true, then it stops when | |
1219 // both the global stack and the local queue reach a given size. If | |
1220 // partially if false, it tries to empty them totally. | |
1221 void drain_global_stack(bool partially); | |
1222 // It keeps picking SATB buffers and processing them until no SATB | |
1223 // buffers are available. | |
1224 void drain_satb_buffers(); | |
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1225 |
342 | 1226 // moves the local finger to a new location |
1227 inline void move_finger_to(HeapWord* new_finger) { | |
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1228 assert(new_finger >= _finger && new_finger < _region_limit, "invariant"); |
342 | 1229 _finger = new_finger; |
1230 } | |
1231 | |
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1232 CMTask(uint worker_id, ConcurrentMark *cm, |
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1233 size_t* marked_bytes, BitMap* card_bm, |
342 | 1234 CMTaskQueue* task_queue, CMTaskQueueSet* task_queues); |
1235 | |
1236 // it prints statistics associated with this task | |
1237 void print_stats(); | |
1238 | |
1239 #if _MARKING_STATS_ | |
1240 void increase_objs_found_on_bitmap() { ++_objs_found_on_bitmap; } | |
1241 #endif // _MARKING_STATS_ | |
1242 }; | |
1972 | 1243 |
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1244 // Class that's used to to print out per-region liveness |
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1245 // information. It's currently used at the end of marking and also |
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1246 // after we sort the old regions at the end of the cleanup operation. |
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1247 class G1PrintRegionLivenessInfoClosure: public HeapRegionClosure { |
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1248 private: |
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1249 outputStream* _out; |
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1250 |
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1251 // Accumulators for these values. |
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1252 size_t _total_used_bytes; |
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1253 size_t _total_capacity_bytes; |
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1254 size_t _total_prev_live_bytes; |
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1255 size_t _total_next_live_bytes; |
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1256 |
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1257 // These are set up when we come across a "stars humongous" region |
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1258 // (as this is where most of this information is stored, not in the |
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1259 // subsequent "continues humongous" regions). After that, for every |
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1260 // region in a given humongous region series we deduce the right |
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1261 // values for it by simply subtracting the appropriate amount from |
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1262 // these fields. All these values should reach 0 after we've visited |
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1263 // the last region in the series. |
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1264 size_t _hum_used_bytes; |
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1265 size_t _hum_capacity_bytes; |
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1266 size_t _hum_prev_live_bytes; |
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1267 size_t _hum_next_live_bytes; |
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1268 |
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1269 // Accumulator for the remembered set size |
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1270 size_t _total_remset_bytes; |
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1271 |
12080 | 1272 // Accumulator for strong code roots memory size |
1273 size_t _total_strong_code_roots_bytes; | |
1274 | |
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1275 static double perc(size_t val, size_t total) { |
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1276 if (total == 0) { |
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1277 return 0.0; |
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1278 } else { |
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1279 return 100.0 * ((double) val / (double) total); |
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1280 } |
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1281 } |
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1282 |
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1283 static double bytes_to_mb(size_t val) { |
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1284 return (double) val / (double) M; |
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1285 } |
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1286 |
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1287 // See the .cpp file. |
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1288 size_t get_hum_bytes(size_t* hum_bytes); |
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1289 void get_hum_bytes(size_t* used_bytes, size_t* capacity_bytes, |
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1290 size_t* prev_live_bytes, size_t* next_live_bytes); |
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1291 |
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1292 public: |
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1293 // The header and footer are printed in the constructor and |
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1294 // destructor respectively. |
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1295 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name); |
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1296 virtual bool doHeapRegion(HeapRegion* r); |
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1297 ~G1PrintRegionLivenessInfoClosure(); |
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1298 }; |
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1299 |
1972 | 1300 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP |