Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.hpp @ 4787:2ace1c4ee8da
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
Summary: This change simplifies the interaction between GC and concurrent marking. By disabling survivor spaces during the initial-mark pause we don't need to propagate marks of objects we copy during each GC (since we never need to copy an explicitly marked object).
Reviewed-by: johnc, brutisso
author | tonyp |
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date | Tue, 10 Jan 2012 18:58:13 -0500 |
parents | 441e946dc1af |
children | 2e966d967c5c |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP | |
27 | |
2152 | 28 #include "gc_implementation/g1/heapRegionSets.hpp" |
1972 | 29 #include "utilities/taskqueue.hpp" |
30 | |
342 | 31 class G1CollectedHeap; |
32 class CMTask; | |
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33 typedef GenericTaskQueue<oop> CMTaskQueue; |
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34 typedef GenericTaskQueueSet<CMTaskQueue> CMTaskQueueSet; |
342 | 35 |
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36 // Closure used by CM during concurrent reference discovery |
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37 // and reference processing (during remarking) to determine |
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38 // if a particular object is alive. It is primarily used |
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39 // to determine if referents of discovered reference objects |
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40 // are alive. An instance is also embedded into the |
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41 // reference processor as the _is_alive_non_header field |
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42 class G1CMIsAliveClosure: public BoolObjectClosure { |
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43 G1CollectedHeap* _g1; |
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44 public: |
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45 G1CMIsAliveClosure(G1CollectedHeap* g1) : |
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46 _g1(g1) |
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47 {} |
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48 |
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49 void do_object(oop obj) { |
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50 ShouldNotCallThis(); |
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51 } |
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52 bool do_object_b(oop obj); |
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53 }; |
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54 |
342 | 55 // A generic CM bit map. This is essentially a wrapper around the BitMap |
56 // class, with one bit per (1<<_shifter) HeapWords. | |
57 | |
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58 class CMBitMapRO VALUE_OBJ_CLASS_SPEC { |
342 | 59 protected: |
60 HeapWord* _bmStartWord; // base address of range covered by map | |
61 size_t _bmWordSize; // map size (in #HeapWords covered) | |
62 const int _shifter; // map to char or bit | |
63 VirtualSpace _virtual_space; // underlying the bit map | |
64 BitMap _bm; // the bit map itself | |
65 | |
66 public: | |
67 // constructor | |
68 CMBitMapRO(ReservedSpace rs, int shifter); | |
69 | |
70 enum { do_yield = true }; | |
71 | |
72 // inquiries | |
73 HeapWord* startWord() const { return _bmStartWord; } | |
74 size_t sizeInWords() const { return _bmWordSize; } | |
75 // the following is one past the last word in space | |
76 HeapWord* endWord() const { return _bmStartWord + _bmWordSize; } | |
77 | |
78 // read marks | |
79 | |
80 bool isMarked(HeapWord* addr) const { | |
81 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
82 "outside underlying space?"); | |
83 return _bm.at(heapWordToOffset(addr)); | |
84 } | |
85 | |
86 // iteration | |
87 bool iterate(BitMapClosure* cl) { return _bm.iterate(cl); } | |
88 bool iterate(BitMapClosure* cl, MemRegion mr); | |
89 | |
90 // Return the address corresponding to the next marked bit at or after | |
91 // "addr", and before "limit", if "limit" is non-NULL. If there is no | |
92 // such bit, returns "limit" if that is non-NULL, or else "endWord()". | |
93 HeapWord* getNextMarkedWordAddress(HeapWord* addr, | |
94 HeapWord* limit = NULL) const; | |
95 // Return the address corresponding to the next unmarked bit at or after | |
96 // "addr", and before "limit", if "limit" is non-NULL. If there is no | |
97 // such bit, returns "limit" if that is non-NULL, or else "endWord()". | |
98 HeapWord* getNextUnmarkedWordAddress(HeapWord* addr, | |
99 HeapWord* limit = NULL) const; | |
100 | |
101 // conversion utilities | |
102 // XXX Fix these so that offsets are size_t's... | |
103 HeapWord* offsetToHeapWord(size_t offset) const { | |
104 return _bmStartWord + (offset << _shifter); | |
105 } | |
106 size_t heapWordToOffset(HeapWord* addr) const { | |
107 return pointer_delta(addr, _bmStartWord) >> _shifter; | |
108 } | |
109 int heapWordDiffToOffsetDiff(size_t diff) const; | |
110 HeapWord* nextWord(HeapWord* addr) { | |
111 return offsetToHeapWord(heapWordToOffset(addr) + 1); | |
112 } | |
113 | |
114 void mostly_disjoint_range_union(BitMap* from_bitmap, | |
115 size_t from_start_index, | |
116 HeapWord* to_start_word, | |
117 size_t word_num); | |
118 | |
119 // debugging | |
120 NOT_PRODUCT(bool covers(ReservedSpace rs) const;) | |
121 }; | |
122 | |
123 class CMBitMap : public CMBitMapRO { | |
124 | |
125 public: | |
126 // constructor | |
127 CMBitMap(ReservedSpace rs, int shifter) : | |
128 CMBitMapRO(rs, shifter) {} | |
129 | |
130 // write marks | |
131 void mark(HeapWord* addr) { | |
132 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
133 "outside underlying space?"); | |
3771 | 134 _bm.set_bit(heapWordToOffset(addr)); |
342 | 135 } |
136 void clear(HeapWord* addr) { | |
137 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
138 "outside underlying space?"); | |
3771 | 139 _bm.clear_bit(heapWordToOffset(addr)); |
342 | 140 } |
141 bool parMark(HeapWord* addr) { | |
142 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
143 "outside underlying space?"); | |
3771 | 144 return _bm.par_set_bit(heapWordToOffset(addr)); |
342 | 145 } |
146 bool parClear(HeapWord* addr) { | |
147 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
148 "outside underlying space?"); | |
3771 | 149 return _bm.par_clear_bit(heapWordToOffset(addr)); |
342 | 150 } |
151 void markRange(MemRegion mr); | |
152 void clearAll(); | |
153 void clearRange(MemRegion mr); | |
154 | |
155 // Starting at the bit corresponding to "addr" (inclusive), find the next | |
156 // "1" bit, if any. This bit starts some run of consecutive "1"'s; find | |
157 // the end of this run (stopping at "end_addr"). Return the MemRegion | |
158 // covering from the start of the region corresponding to the first bit | |
159 // of the run to the end of the region corresponding to the last bit of | |
160 // the run. If there is no "1" bit at or after "addr", return an empty | |
161 // MemRegion. | |
162 MemRegion getAndClearMarkedRegion(HeapWord* addr, HeapWord* end_addr); | |
163 }; | |
164 | |
165 // Represents a marking stack used by the CM collector. | |
166 // Ideally this should be GrowableArray<> just like MSC's marking stack(s). | |
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167 class CMMarkStack VALUE_OBJ_CLASS_SPEC { |
342 | 168 ConcurrentMark* _cm; |
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169 oop* _base; // bottom of stack |
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170 jint _index; // one more than last occupied index |
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171 jint _capacity; // max #elements |
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172 jint _saved_index; // value of _index saved at start of GC |
342 | 173 NOT_PRODUCT(jint _max_depth;) // max depth plumbed during run |
174 | |
175 bool _overflow; | |
176 DEBUG_ONLY(bool _drain_in_progress;) | |
177 DEBUG_ONLY(bool _drain_in_progress_yields;) | |
178 | |
179 public: | |
180 CMMarkStack(ConcurrentMark* cm); | |
181 ~CMMarkStack(); | |
182 | |
183 void allocate(size_t size); | |
184 | |
185 oop pop() { | |
186 if (!isEmpty()) { | |
187 return _base[--_index] ; | |
188 } | |
189 return NULL; | |
190 } | |
191 | |
192 // If overflow happens, don't do the push, and record the overflow. | |
193 // *Requires* that "ptr" is already marked. | |
194 void push(oop ptr) { | |
195 if (isFull()) { | |
196 // Record overflow. | |
197 _overflow = true; | |
198 return; | |
199 } else { | |
200 _base[_index++] = ptr; | |
201 NOT_PRODUCT(_max_depth = MAX2(_max_depth, _index)); | |
202 } | |
203 } | |
204 // Non-block impl. Note: concurrency is allowed only with other | |
205 // "par_push" operations, not with "pop" or "drain". We would need | |
206 // parallel versions of them if such concurrency was desired. | |
207 void par_push(oop ptr); | |
208 | |
209 // Pushes the first "n" elements of "ptr_arr" on the stack. | |
210 // Non-block impl. Note: concurrency is allowed only with other | |
211 // "par_adjoin_arr" or "push" operations, not with "pop" or "drain". | |
212 void par_adjoin_arr(oop* ptr_arr, int n); | |
213 | |
214 // Pushes the first "n" elements of "ptr_arr" on the stack. | |
215 // Locking impl: concurrency is allowed only with | |
216 // "par_push_arr" and/or "par_pop_arr" operations, which use the same | |
217 // locking strategy. | |
218 void par_push_arr(oop* ptr_arr, int n); | |
219 | |
220 // If returns false, the array was empty. Otherwise, removes up to "max" | |
221 // elements from the stack, and transfers them to "ptr_arr" in an | |
222 // unspecified order. The actual number transferred is given in "n" ("n | |
223 // == 0" is deliberately redundant with the return value.) Locking impl: | |
224 // concurrency is allowed only with "par_push_arr" and/or "par_pop_arr" | |
225 // operations, which use the same locking strategy. | |
226 bool par_pop_arr(oop* ptr_arr, int max, int* n); | |
227 | |
228 // Drain the mark stack, applying the given closure to all fields of | |
229 // objects on the stack. (That is, continue until the stack is empty, | |
230 // even if closure applications add entries to the stack.) The "bm" | |
231 // argument, if non-null, may be used to verify that only marked objects | |
232 // are on the mark stack. If "yield_after" is "true", then the | |
233 // concurrent marker performing the drain offers to yield after | |
234 // processing each object. If a yield occurs, stops the drain operation | |
235 // and returns false. Otherwise, returns true. | |
236 template<class OopClosureClass> | |
237 bool drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after = false); | |
238 | |
239 bool isEmpty() { return _index == 0; } | |
240 bool isFull() { return _index == _capacity; } | |
241 int maxElems() { return _capacity; } | |
242 | |
243 bool overflow() { return _overflow; } | |
244 void clear_overflow() { _overflow = false; } | |
245 | |
246 int size() { return _index; } | |
247 | |
248 void setEmpty() { _index = 0; clear_overflow(); } | |
249 | |
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250 // Record the current index. |
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251 void note_start_of_gc(); |
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252 |
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253 // Make sure that we have not added any entries to the stack during GC. |
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254 void note_end_of_gc(); |
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255 |
342 | 256 // iterate over the oops in the mark stack, up to the bound recorded via |
257 // the call above. | |
258 void oops_do(OopClosure* f); | |
259 }; | |
260 | |
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261 class CMRegionStack VALUE_OBJ_CLASS_SPEC { |
342 | 262 MemRegion* _base; |
263 jint _capacity; | |
264 jint _index; | |
265 jint _oops_do_bound; | |
266 bool _overflow; | |
267 public: | |
268 CMRegionStack(); | |
269 ~CMRegionStack(); | |
270 void allocate(size_t size); | |
271 | |
272 // This is lock-free; assumes that it will only be called in parallel | |
273 // with other "push" operations (no pops). | |
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274 void push_lock_free(MemRegion mr); |
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275 |
342 | 276 // Lock-free; assumes that it will only be called in parallel |
277 // with other "pop" operations (no pushes). | |
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278 MemRegion pop_lock_free(); |
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279 |
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280 #if 0 |
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281 // The routines that manipulate the region stack with a lock are |
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282 // not currently used. They should be retained, however, as a |
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283 // diagnostic aid. |
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284 |
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285 // These two are the implementations that use a lock. They can be |
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286 // called concurrently with each other but they should not be called |
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287 // concurrently with the lock-free versions (push() / pop()). |
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288 void push_with_lock(MemRegion mr); |
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289 MemRegion pop_with_lock(); |
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290 #endif |
342 | 291 |
292 bool isEmpty() { return _index == 0; } | |
293 bool isFull() { return _index == _capacity; } | |
294 | |
295 bool overflow() { return _overflow; } | |
296 void clear_overflow() { _overflow = false; } | |
297 | |
298 int size() { return _index; } | |
299 | |
300 // It iterates over the entries in the region stack and it | |
301 // invalidates (i.e. assigns MemRegion()) the ones that point to | |
302 // regions in the collection set. | |
303 bool invalidate_entries_into_cset(); | |
304 | |
305 // This gives an upper bound up to which the iteration in | |
306 // invalidate_entries_into_cset() will reach. This prevents | |
307 // newly-added entries to be unnecessarily scanned. | |
308 void set_oops_do_bound() { | |
309 _oops_do_bound = _index; | |
310 } | |
311 | |
312 void setEmpty() { _index = 0; clear_overflow(); } | |
313 }; | |
314 | |
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315 class ForceOverflowSettings VALUE_OBJ_CLASS_SPEC { |
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316 private: |
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317 #ifndef PRODUCT |
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318 uintx _num_remaining; |
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319 bool _force; |
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320 #endif // !defined(PRODUCT) |
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321 |
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322 public: |
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323 void init() PRODUCT_RETURN; |
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324 void update() PRODUCT_RETURN; |
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325 bool should_force() PRODUCT_RETURN_( return false; ); |
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326 }; |
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327 |
342 | 328 // this will enable a variety of different statistics per GC task |
329 #define _MARKING_STATS_ 0 | |
330 // this will enable the higher verbose levels | |
331 #define _MARKING_VERBOSE_ 0 | |
332 | |
333 #if _MARKING_STATS_ | |
334 #define statsOnly(statement) \ | |
335 do { \ | |
336 statement ; \ | |
337 } while (0) | |
338 #else // _MARKING_STATS_ | |
339 #define statsOnly(statement) \ | |
340 do { \ | |
341 } while (0) | |
342 #endif // _MARKING_STATS_ | |
343 | |
344 typedef enum { | |
345 no_verbose = 0, // verbose turned off | |
346 stats_verbose, // only prints stats at the end of marking | |
347 low_verbose, // low verbose, mostly per region and per major event | |
348 medium_verbose, // a bit more detailed than low | |
349 high_verbose // per object verbose | |
350 } CMVerboseLevel; | |
351 | |
352 | |
353 class ConcurrentMarkThread; | |
354 | |
549
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355 class ConcurrentMark: public CHeapObj { |
342 | 356 friend class ConcurrentMarkThread; |
357 friend class CMTask; | |
358 friend class CMBitMapClosure; | |
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359 friend class CSetMarkOopClosure; |
342 | 360 friend class CMGlobalObjectClosure; |
361 friend class CMRemarkTask; | |
362 friend class CMConcurrentMarkingTask; | |
363 friend class G1ParNoteEndTask; | |
364 friend class CalcLiveObjectsClosure; | |
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365 friend class G1CMRefProcTaskProxy; |
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366 friend class G1CMRefProcTaskExecutor; |
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367 friend class G1CMParKeepAliveAndDrainClosure; |
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368 friend class G1CMParDrainMarkingStackClosure; |
342 | 369 |
370 protected: | |
371 ConcurrentMarkThread* _cmThread; // the thread doing the work | |
372 G1CollectedHeap* _g1h; // the heap. | |
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373 uint _parallel_marking_threads; // the number of marking |
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374 // threads we're use |
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375 uint _max_parallel_marking_threads; // max number of marking |
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376 // threads we'll ever use |
342 | 377 double _sleep_factor; // how much we have to sleep, with |
378 // respect to the work we just did, to | |
379 // meet the marking overhead goal | |
380 double _marking_task_overhead; // marking target overhead for | |
381 // a single task | |
382 | |
383 // same as the two above, but for the cleanup task | |
384 double _cleanup_sleep_factor; | |
385 double _cleanup_task_overhead; | |
386 | |
2152 | 387 FreeRegionList _cleanup_list; |
342 | 388 |
389 // CMS marking support structures | |
390 CMBitMap _markBitMap1; | |
391 CMBitMap _markBitMap2; | |
392 CMBitMapRO* _prevMarkBitMap; // completed mark bitmap | |
393 CMBitMap* _nextMarkBitMap; // under-construction mark bitmap | |
394 bool _at_least_one_mark_complete; | |
395 | |
396 BitMap _region_bm; | |
397 BitMap _card_bm; | |
398 | |
399 // Heap bounds | |
400 HeapWord* _heap_start; | |
401 HeapWord* _heap_end; | |
402 | |
403 // For gray objects | |
404 CMMarkStack _markStack; // Grey objects behind global finger. | |
405 CMRegionStack _regionStack; // Grey regions behind global finger. | |
406 HeapWord* volatile _finger; // the global finger, region aligned, | |
407 // always points to the end of the | |
408 // last claimed region | |
409 | |
410 // marking tasks | |
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411 uint _max_task_num; // maximum task number |
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412 uint _active_tasks; // task num currently active |
342 | 413 CMTask** _tasks; // task queue array (max_task_num len) |
414 CMTaskQueueSet* _task_queues; // task queue set | |
415 ParallelTaskTerminator _terminator; // for termination | |
416 | |
417 // Two sync barriers that are used to synchronise tasks when an | |
418 // overflow occurs. The algorithm is the following. All tasks enter | |
419 // the first one to ensure that they have all stopped manipulating | |
420 // the global data structures. After they exit it, they re-initialise | |
421 // their data structures and task 0 re-initialises the global data | |
422 // structures. Then, they enter the second sync barrier. This | |
423 // ensure, that no task starts doing work before all data | |
424 // structures (local and global) have been re-initialised. When they | |
425 // exit it, they are free to start working again. | |
426 WorkGangBarrierSync _first_overflow_barrier_sync; | |
427 WorkGangBarrierSync _second_overflow_barrier_sync; | |
428 | |
429 | |
430 // this is set by any task, when an overflow on the global data | |
431 // structures is detected. | |
432 volatile bool _has_overflown; | |
433 // true: marking is concurrent, false: we're in remark | |
434 volatile bool _concurrent; | |
435 // set at the end of a Full GC so that marking aborts | |
436 volatile bool _has_aborted; | |
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437 |
342 | 438 // used when remark aborts due to an overflow to indicate that |
439 // another concurrent marking phase should start | |
440 volatile bool _restart_for_overflow; | |
441 | |
442 // This is true from the very start of concurrent marking until the | |
443 // point when all the tasks complete their work. It is really used | |
444 // to determine the points between the end of concurrent marking and | |
445 // time of remark. | |
446 volatile bool _concurrent_marking_in_progress; | |
447 | |
448 // verbose level | |
449 CMVerboseLevel _verbose_level; | |
450 | |
451 // These two fields are used to implement the optimisation that | |
452 // avoids pushing objects on the global/region stack if there are | |
453 // no collection set regions above the lowest finger. | |
454 | |
455 // This is the lowest finger (among the global and local fingers), | |
456 // which is calculated before a new collection set is chosen. | |
457 HeapWord* _min_finger; | |
458 // If this flag is true, objects/regions that are marked below the | |
459 // finger should be pushed on the stack(s). If this is flag is | |
460 // false, it is safe not to push them on the stack(s). | |
461 bool _should_gray_objects; | |
462 | |
463 // All of these times are in ms. | |
464 NumberSeq _init_times; | |
465 NumberSeq _remark_times; | |
466 NumberSeq _remark_mark_times; | |
467 NumberSeq _remark_weak_ref_times; | |
468 NumberSeq _cleanup_times; | |
469 double _total_counting_time; | |
470 double _total_rs_scrub_time; | |
471 | |
472 double* _accum_task_vtime; // accumulated task vtime | |
473 | |
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474 FlexibleWorkGang* _parallel_workers; |
342 | 475 |
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476 ForceOverflowSettings _force_overflow_conc; |
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477 ForceOverflowSettings _force_overflow_stw; |
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478 |
342 | 479 void weakRefsWork(bool clear_all_soft_refs); |
480 | |
481 void swapMarkBitMaps(); | |
482 | |
483 // It resets the global marking data structures, as well as the | |
484 // task local ones; should be called during initial mark. | |
485 void reset(); | |
486 // It resets all the marking data structures. | |
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487 void clear_marking_state(bool clear_overflow = true); |
342 | 488 |
489 // It should be called to indicate which phase we're in (concurrent | |
490 // mark or remark) and how many threads are currently active. | |
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491 void set_phase(uint active_tasks, bool concurrent); |
342 | 492 // We do this after we're done with marking so that the marking data |
493 // structures are initialised to a sensible and predictable state. | |
494 void set_non_marking_state(); | |
495 | |
496 // prints all gathered CM-related statistics | |
497 void print_stats(); | |
498 | |
2152 | 499 bool cleanup_list_is_empty() { |
500 return _cleanup_list.is_empty(); | |
501 } | |
502 | |
342 | 503 // accessor methods |
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504 uint parallel_marking_threads() { return _parallel_marking_threads; } |
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505 uint max_parallel_marking_threads() { return _max_parallel_marking_threads;} |
342 | 506 double sleep_factor() { return _sleep_factor; } |
507 double marking_task_overhead() { return _marking_task_overhead;} | |
508 double cleanup_sleep_factor() { return _cleanup_sleep_factor; } | |
509 double cleanup_task_overhead() { return _cleanup_task_overhead;} | |
510 | |
511 HeapWord* finger() { return _finger; } | |
512 bool concurrent() { return _concurrent; } | |
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513 uint active_tasks() { return _active_tasks; } |
342 | 514 ParallelTaskTerminator* terminator() { return &_terminator; } |
515 | |
516 // It claims the next available region to be scanned by a marking | |
517 // task. It might return NULL if the next region is empty or we have | |
518 // run out of regions. In the latter case, out_of_regions() | |
519 // determines whether we've really run out of regions or the task | |
520 // should call claim_region() again. This might seem a bit | |
521 // awkward. Originally, the code was written so that claim_region() | |
522 // either successfully returned with a non-empty region or there | |
523 // were no more regions to be claimed. The problem with this was | |
524 // that, in certain circumstances, it iterated over large chunks of | |
525 // the heap finding only empty regions and, while it was working, it | |
526 // was preventing the calling task to call its regular clock | |
527 // method. So, this way, each task will spend very little time in | |
528 // claim_region() and is allowed to call the regular clock method | |
529 // frequently. | |
530 HeapRegion* claim_region(int task); | |
531 | |
532 // It determines whether we've run out of regions to scan. | |
533 bool out_of_regions() { return _finger == _heap_end; } | |
534 | |
535 // Returns the task with the given id | |
536 CMTask* task(int id) { | |
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537 assert(0 <= id && id < (int) _active_tasks, |
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538 "task id not within active bounds"); |
342 | 539 return _tasks[id]; |
540 } | |
541 | |
542 // Returns the task queue with the given id | |
543 CMTaskQueue* task_queue(int id) { | |
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544 assert(0 <= id && id < (int) _active_tasks, |
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545 "task queue id not within active bounds"); |
342 | 546 return (CMTaskQueue*) _task_queues->queue(id); |
547 } | |
548 | |
549 // Returns the task queue set | |
550 CMTaskQueueSet* task_queues() { return _task_queues; } | |
551 | |
552 // Access / manipulation of the overflow flag which is set to | |
553 // indicate that the global stack or region stack has overflown | |
554 bool has_overflown() { return _has_overflown; } | |
555 void set_has_overflown() { _has_overflown = true; } | |
556 void clear_has_overflown() { _has_overflown = false; } | |
557 | |
558 bool has_aborted() { return _has_aborted; } | |
559 bool restart_for_overflow() { return _restart_for_overflow; } | |
560 | |
561 // Methods to enter the two overflow sync barriers | |
562 void enter_first_sync_barrier(int task_num); | |
563 void enter_second_sync_barrier(int task_num); | |
564 | |
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565 ForceOverflowSettings* force_overflow_conc() { |
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566 return &_force_overflow_conc; |
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567 } |
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568 |
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569 ForceOverflowSettings* force_overflow_stw() { |
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570 return &_force_overflow_stw; |
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571 } |
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572 |
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573 ForceOverflowSettings* force_overflow() { |
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574 if (concurrent()) { |
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575 return force_overflow_conc(); |
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576 } else { |
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577 return force_overflow_stw(); |
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578 } |
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579 } |
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580 |
342 | 581 public: |
582 // Manipulation of the global mark stack. | |
583 // Notice that the first mark_stack_push is CAS-based, whereas the | |
584 // two below are Mutex-based. This is OK since the first one is only | |
585 // called during evacuation pauses and doesn't compete with the | |
586 // other two (which are called by the marking tasks during | |
587 // concurrent marking or remark). | |
588 bool mark_stack_push(oop p) { | |
589 _markStack.par_push(p); | |
590 if (_markStack.overflow()) { | |
591 set_has_overflown(); | |
592 return false; | |
593 } | |
594 return true; | |
595 } | |
596 bool mark_stack_push(oop* arr, int n) { | |
597 _markStack.par_push_arr(arr, n); | |
598 if (_markStack.overflow()) { | |
599 set_has_overflown(); | |
600 return false; | |
601 } | |
602 return true; | |
603 } | |
604 void mark_stack_pop(oop* arr, int max, int* n) { | |
605 _markStack.par_pop_arr(arr, max, n); | |
606 } | |
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607 size_t mark_stack_size() { return _markStack.size(); } |
342 | 608 size_t partial_mark_stack_size_target() { return _markStack.maxElems()/3; } |
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609 bool mark_stack_overflow() { return _markStack.overflow(); } |
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610 bool mark_stack_empty() { return _markStack.isEmpty(); } |
342 | 611 |
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612 // (Lock-free) Manipulation of the region stack |
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613 bool region_stack_push_lock_free(MemRegion mr) { |
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614 // Currently we only call the lock-free version during evacuation |
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615 // pauses. |
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616 assert(SafepointSynchronize::is_at_safepoint(), "world should be stopped"); |
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617 |
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618 _regionStack.push_lock_free(mr); |
342 | 619 if (_regionStack.overflow()) { |
620 set_has_overflown(); | |
621 return false; | |
622 } | |
623 return true; | |
624 } | |
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625 |
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626 // Lock-free version of region-stack pop. Should only be |
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627 // called in tandem with other lock-free pops. |
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628 MemRegion region_stack_pop_lock_free() { |
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629 return _regionStack.pop_lock_free(); |
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630 } |
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631 |
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632 #if 0 |
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633 // The routines that manipulate the region stack with a lock are |
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634 // not currently used. They should be retained, however, as a |
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635 // diagnostic aid. |
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636 |
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637 bool region_stack_push_with_lock(MemRegion mr) { |
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638 // Currently we only call the lock-based version during either |
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639 // concurrent marking or remark. |
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640 assert(!SafepointSynchronize::is_at_safepoint() || !concurrent(), |
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641 "if we are at a safepoint it should be the remark safepoint"); |
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642 |
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643 _regionStack.push_with_lock(mr); |
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644 if (_regionStack.overflow()) { |
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645 set_has_overflown(); |
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646 return false; |
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647 } |
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648 return true; |
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649 } |
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650 |
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651 MemRegion region_stack_pop_with_lock() { |
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652 // Currently we only call the lock-based version during either |
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653 // concurrent marking or remark. |
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654 assert(!SafepointSynchronize::is_at_safepoint() || !concurrent(), |
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655 "if we are at a safepoint it should be the remark safepoint"); |
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656 |
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657 return _regionStack.pop_with_lock(); |
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658 } |
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659 #endif |
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660 |
342 | 661 int region_stack_size() { return _regionStack.size(); } |
662 bool region_stack_overflow() { return _regionStack.overflow(); } | |
663 bool region_stack_empty() { return _regionStack.isEmpty(); } | |
664 | |
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665 // Iterate over any regions that were aborted while draining the |
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666 // region stack (any such regions are saved in the corresponding |
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667 // CMTask) and invalidate (i.e. assign to the empty MemRegion()) |
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668 // any regions that point into the collection set. |
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669 bool invalidate_aborted_regions_in_cset(); |
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670 |
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671 // Returns true if there are any aborted memory regions. |
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672 bool has_aborted_regions(); |
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673 |
342 | 674 bool concurrent_marking_in_progress() { |
675 return _concurrent_marking_in_progress; | |
676 } | |
677 void set_concurrent_marking_in_progress() { | |
678 _concurrent_marking_in_progress = true; | |
679 } | |
680 void clear_concurrent_marking_in_progress() { | |
681 _concurrent_marking_in_progress = false; | |
682 } | |
683 | |
684 void update_accum_task_vtime(int i, double vtime) { | |
685 _accum_task_vtime[i] += vtime; | |
686 } | |
687 | |
688 double all_task_accum_vtime() { | |
689 double ret = 0.0; | |
690 for (int i = 0; i < (int)_max_task_num; ++i) | |
691 ret += _accum_task_vtime[i]; | |
692 return ret; | |
693 } | |
694 | |
695 // Attempts to steal an object from the task queues of other tasks | |
696 bool try_stealing(int task_num, int* hash_seed, oop& obj) { | |
697 return _task_queues->steal(task_num, hash_seed, obj); | |
698 } | |
699 | |
700 // It grays an object by first marking it. Then, if it's behind the | |
701 // global finger, it also pushes it on the global stack. | |
702 void deal_with_reference(oop obj); | |
703 | |
704 ConcurrentMark(ReservedSpace rs, int max_regions); | |
705 ~ConcurrentMark(); | |
706 ConcurrentMarkThread* cmThread() { return _cmThread; } | |
707 | |
708 CMBitMapRO* prevMarkBitMap() const { return _prevMarkBitMap; } | |
709 CMBitMap* nextMarkBitMap() const { return _nextMarkBitMap; } | |
710 | |
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711 // Returns the number of GC threads to be used in a concurrent |
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712 // phase based on the number of GC threads being used in a STW |
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713 // phase. |
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714 uint scale_parallel_threads(uint n_par_threads); |
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715 |
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716 // Calculates the number of GC threads to be used in a concurrent phase. |
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717 uint calc_parallel_marking_threads(); |
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718 |
342 | 719 // The following three are interaction between CM and |
720 // G1CollectedHeap | |
721 | |
722 // This notifies CM that a root during initial-mark needs to be | |
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723 // grayed. It is MT-safe. |
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724 inline void grayRoot(oop obj, size_t word_size); |
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725 |
342 | 726 // It's used during evacuation pauses to gray a region, if |
727 // necessary, and it's MT-safe. It assumes that the caller has | |
728 // marked any objects on that region. If _should_gray_objects is | |
729 // true and we're still doing concurrent marking, the region is | |
730 // pushed on the region stack, if it is located below the global | |
731 // finger, otherwise we do nothing. | |
732 void grayRegionIfNecessary(MemRegion mr); | |
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733 |
342 | 734 // It's used during evacuation pauses to mark and, if necessary, |
735 // gray a single object and it's MT-safe. It assumes the caller did | |
736 // not mark the object. If _should_gray_objects is true and we're | |
737 // still doing concurrent marking, the objects is pushed on the | |
738 // global stack, if it is located below the global finger, otherwise | |
739 // we do nothing. | |
740 void markAndGrayObjectIfNecessary(oop p); | |
741 | |
1388 | 742 // It iterates over the heap and for each object it comes across it |
743 // will dump the contents of its reference fields, as well as | |
744 // liveness information for the object and its referents. The dump | |
745 // will be written to a file with the following name: | |
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746 // G1PrintReachableBaseFile + "." + str. |
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747 // vo decides whether the prev (vo == UsePrevMarking), the next |
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748 // (vo == UseNextMarking) marking information, or the mark word |
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749 // (vo == UseMarkWord) will be used to determine the liveness of |
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750 // each object / referent. |
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751 // If all is true, all objects in the heap will be dumped, otherwise |
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752 // only the live ones. In the dump the following symbols / breviations |
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753 // are used: |
1388 | 754 // M : an explicitly live object (its bitmap bit is set) |
755 // > : an implicitly live object (over tams) | |
756 // O : an object outside the G1 heap (typically: in the perm gen) | |
757 // NOT : a reference field whose referent is not live | |
758 // AND MARKED : indicates that an object is both explicitly and | |
759 // implicitly live (it should be one or the other, not both) | |
760 void print_reachable(const char* str, | |
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761 VerifyOption vo, bool all) PRODUCT_RETURN; |
342 | 762 |
763 // Clear the next marking bitmap (will be called concurrently). | |
764 void clearNextBitmap(); | |
765 | |
766 // These two do the work that needs to be done before and after the | |
767 // initial root checkpoint. Since this checkpoint can be done at two | |
768 // different points (i.e. an explicit pause or piggy-backed on a | |
769 // young collection), then it's nice to be able to easily share the | |
770 // pre/post code. It might be the case that we can put everything in | |
771 // the post method. TP | |
772 void checkpointRootsInitialPre(); | |
773 void checkpointRootsInitialPost(); | |
774 | |
775 // Do concurrent phase of marking, to a tentative transitive closure. | |
776 void markFromRoots(); | |
777 | |
778 // Process all unprocessed SATB buffers. It is called at the | |
779 // beginning of an evacuation pause. | |
780 void drainAllSATBBuffers(); | |
781 | |
782 void checkpointRootsFinal(bool clear_all_soft_refs); | |
783 void checkpointRootsFinalWork(); | |
784 void calcDesiredRegions(); | |
785 void cleanup(); | |
786 void completeCleanup(); | |
787 | |
788 // Mark in the previous bitmap. NB: this is usually read-only, so use | |
789 // this carefully! | |
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790 inline void markPrev(oop p); |
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791 inline void markNext(oop p); |
342 | 792 void clear(oop p); |
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793 // Clears marks for all objects in the given range, for the prev, |
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794 // next, or both bitmaps. NB: the previous bitmap is usually |
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795 // read-only, so use this carefully! |
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796 void clearRangePrevBitmap(MemRegion mr); |
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797 void clearRangeNextBitmap(MemRegion mr); |
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798 void clearRangeBothBitmaps(MemRegion mr); |
342 | 799 |
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800 // Notify data structures that a GC has started. |
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801 void note_start_of_gc() { |
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802 _markStack.note_start_of_gc(); |
342 | 803 } |
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804 |
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805 // Notify data structures that a GC is finished. |
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806 void note_end_of_gc() { |
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807 _markStack.note_end_of_gc(); |
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808 } |
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809 |
342 | 810 // Iterate over the oops in the mark stack and all local queues. It |
811 // also calls invalidate_entries_into_cset() on the region stack. | |
812 void oops_do(OopClosure* f); | |
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813 |
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814 // Verify that there are no CSet oops on the stacks (taskqueues / |
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815 // global mark stack), enqueued SATB buffers, per-thread SATB |
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816 // buffers, and fingers (global / per-task). The boolean parameters |
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817 // decide which of the above data structures to verify. If marking |
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818 // is not in progress, it's a no-op. |
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819 void verify_no_cset_oops(bool verify_stacks, |
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820 bool verify_enqueued_buffers, |
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821 bool verify_thread_buffers, |
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822 bool verify_fingers) PRODUCT_RETURN; |
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823 |
342 | 824 // It is called at the end of an evacuation pause during marking so |
825 // that CM is notified of where the new end of the heap is. It | |
826 // doesn't do anything if concurrent_marking_in_progress() is false, | |
827 // unless the force parameter is true. | |
828 void update_g1_committed(bool force = false); | |
829 | |
830 void complete_marking_in_collection_set(); | |
831 | |
832 // It indicates that a new collection set is being chosen. | |
833 void newCSet(); | |
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834 |
342 | 835 // It registers a collection set heap region with CM. This is used |
836 // to determine whether any heap regions are located above the finger. | |
837 void registerCSetRegion(HeapRegion* hr); | |
838 | |
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839 // Resets the region fields of any active CMTask whose region fields |
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840 // are in the collection set (i.e. the region currently claimed by |
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841 // the CMTask will be evacuated and may be used, subsequently, as |
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842 // an alloc region). When this happens the region fields in the CMTask |
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843 // are stale and, hence, should be cleared causing the worker thread |
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844 // to claim a new region. |
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845 void reset_active_task_region_fields_in_cset(); |
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846 |
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847 // Registers the maximum region-end associated with a set of |
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848 // regions with CM. Again this is used to determine whether any |
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849 // heap regions are located above the finger. |
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850 void register_collection_set_finger(HeapWord* max_finger) { |
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851 // max_finger is the highest heap region end of the regions currently |
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852 // contained in the collection set. If this value is larger than |
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853 // _min_finger then we need to gray objects. |
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854 // This routine is like registerCSetRegion but for an entire |
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855 // collection of regions. |
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856 if (max_finger > _min_finger) { |
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857 _should_gray_objects = true; |
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858 } |
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859 } |
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860 |
342 | 861 // Returns "true" if at least one mark has been completed. |
862 bool at_least_one_mark_complete() { return _at_least_one_mark_complete; } | |
863 | |
864 bool isMarked(oop p) const { | |
865 assert(p != NULL && p->is_oop(), "expected an oop"); | |
866 HeapWord* addr = (HeapWord*)p; | |
867 assert(addr >= _nextMarkBitMap->startWord() || | |
868 addr < _nextMarkBitMap->endWord(), "in a region"); | |
869 | |
870 return _nextMarkBitMap->isMarked(addr); | |
871 } | |
872 | |
873 inline bool not_yet_marked(oop p) const; | |
874 | |
875 // XXX Debug code | |
876 bool containing_card_is_marked(void* p); | |
877 bool containing_cards_are_marked(void* start, void* last); | |
878 | |
879 bool isPrevMarked(oop p) const { | |
880 assert(p != NULL && p->is_oop(), "expected an oop"); | |
881 HeapWord* addr = (HeapWord*)p; | |
882 assert(addr >= _prevMarkBitMap->startWord() || | |
883 addr < _prevMarkBitMap->endWord(), "in a region"); | |
884 | |
885 return _prevMarkBitMap->isMarked(addr); | |
886 } | |
887 | |
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888 inline bool do_yield_check(uint worker_i = 0); |
342 | 889 inline bool should_yield(); |
890 | |
891 // Called to abort the marking cycle after a Full GC takes palce. | |
892 void abort(); | |
893 | |
894 // This prints the global/local fingers. It is used for debugging. | |
895 NOT_PRODUCT(void print_finger();) | |
896 | |
897 void print_summary_info(); | |
898 | |
1019 | 899 void print_worker_threads_on(outputStream* st) const; |
900 | |
342 | 901 // The following indicate whether a given verbose level has been |
902 // set. Notice that anything above stats is conditional to | |
903 // _MARKING_VERBOSE_ having been set to 1 | |
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904 bool verbose_stats() { |
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905 return _verbose_level >= stats_verbose; |
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906 } |
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907 bool verbose_low() { |
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908 return _MARKING_VERBOSE_ && _verbose_level >= low_verbose; |
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909 } |
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910 bool verbose_medium() { |
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911 return _MARKING_VERBOSE_ && _verbose_level >= medium_verbose; |
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912 } |
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913 bool verbose_high() { |
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914 return _MARKING_VERBOSE_ && _verbose_level >= high_verbose; |
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915 } |
342 | 916 }; |
917 | |
918 // A class representing a marking task. | |
919 class CMTask : public TerminatorTerminator { | |
920 private: | |
921 enum PrivateConstants { | |
922 // the regular clock call is called once the scanned words reaches | |
923 // this limit | |
924 words_scanned_period = 12*1024, | |
925 // the regular clock call is called once the number of visited | |
926 // references reaches this limit | |
927 refs_reached_period = 384, | |
928 // initial value for the hash seed, used in the work stealing code | |
929 init_hash_seed = 17, | |
930 // how many entries will be transferred between global stack and | |
931 // local queues | |
932 global_stack_transfer_size = 16 | |
933 }; | |
934 | |
935 int _task_id; | |
936 G1CollectedHeap* _g1h; | |
937 ConcurrentMark* _cm; | |
938 CMBitMap* _nextMarkBitMap; | |
939 // the task queue of this task | |
940 CMTaskQueue* _task_queue; | |
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941 private: |
342 | 942 // the task queue set---needed for stealing |
943 CMTaskQueueSet* _task_queues; | |
944 // indicates whether the task has been claimed---this is only for | |
945 // debugging purposes | |
946 bool _claimed; | |
947 | |
948 // number of calls to this task | |
949 int _calls; | |
950 | |
951 // when the virtual timer reaches this time, the marking step should | |
952 // exit | |
953 double _time_target_ms; | |
954 // the start time of the current marking step | |
955 double _start_time_ms; | |
956 | |
957 // the oop closure used for iterations over oops | |
3771 | 958 G1CMOopClosure* _cm_oop_closure; |
342 | 959 |
960 // the region this task is scanning, NULL if we're not scanning any | |
961 HeapRegion* _curr_region; | |
962 // the local finger of this task, NULL if we're not scanning a region | |
963 HeapWord* _finger; | |
964 // limit of the region this task is scanning, NULL if we're not scanning one | |
965 HeapWord* _region_limit; | |
966 | |
967 // This is used only when we scan regions popped from the region | |
968 // stack. It records what the last object on such a region we | |
969 // scanned was. It is used to ensure that, if we abort region | |
970 // iteration, we do not rescan the first part of the region. This | |
971 // should be NULL when we're not scanning a region from the region | |
972 // stack. | |
973 HeapWord* _region_finger; | |
974 | |
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975 // If we abort while scanning a region we record the remaining |
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976 // unscanned portion and check this field when marking restarts. |
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977 // This avoids having to push on the region stack while other |
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978 // marking threads may still be popping regions. |
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979 // If we were to push the unscanned portion directly to the |
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980 // region stack then we would need to using locking versions |
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981 // of the push and pop operations. |
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982 MemRegion _aborted_region; |
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983 |
342 | 984 // the number of words this task has scanned |
985 size_t _words_scanned; | |
986 // When _words_scanned reaches this limit, the regular clock is | |
987 // called. Notice that this might be decreased under certain | |
988 // circumstances (i.e. when we believe that we did an expensive | |
989 // operation). | |
990 size_t _words_scanned_limit; | |
991 // the initial value of _words_scanned_limit (i.e. what it was | |
992 // before it was decreased). | |
993 size_t _real_words_scanned_limit; | |
994 | |
995 // the number of references this task has visited | |
996 size_t _refs_reached; | |
997 // When _refs_reached reaches this limit, the regular clock is | |
998 // called. Notice this this might be decreased under certain | |
999 // circumstances (i.e. when we believe that we did an expensive | |
1000 // operation). | |
1001 size_t _refs_reached_limit; | |
1002 // the initial value of _refs_reached_limit (i.e. what it was before | |
1003 // it was decreased). | |
1004 size_t _real_refs_reached_limit; | |
1005 | |
1006 // used by the work stealing stuff | |
1007 int _hash_seed; | |
1008 // if this is true, then the task has aborted for some reason | |
1009 bool _has_aborted; | |
1010 // set when the task aborts because it has met its time quota | |
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1011 bool _has_timed_out; |
342 | 1012 // true when we're draining SATB buffers; this avoids the task |
1013 // aborting due to SATB buffers being available (as we're already | |
1014 // dealing with them) | |
1015 bool _draining_satb_buffers; | |
1016 | |
1017 // number sequence of past step times | |
1018 NumberSeq _step_times_ms; | |
1019 // elapsed time of this task | |
1020 double _elapsed_time_ms; | |
1021 // termination time of this task | |
1022 double _termination_time_ms; | |
1023 // when this task got into the termination protocol | |
1024 double _termination_start_time_ms; | |
1025 | |
1026 // true when the task is during a concurrent phase, false when it is | |
1027 // in the remark phase (so, in the latter case, we do not have to | |
1028 // check all the things that we have to check during the concurrent | |
1029 // phase, i.e. SATB buffer availability...) | |
1030 bool _concurrent; | |
1031 | |
1032 TruncatedSeq _marking_step_diffs_ms; | |
1033 | |
1034 // LOTS of statistics related with this task | |
1035 #if _MARKING_STATS_ | |
1036 NumberSeq _all_clock_intervals_ms; | |
1037 double _interval_start_time_ms; | |
1038 | |
1039 int _aborted; | |
1040 int _aborted_overflow; | |
1041 int _aborted_cm_aborted; | |
1042 int _aborted_yield; | |
1043 int _aborted_timed_out; | |
1044 int _aborted_satb; | |
1045 int _aborted_termination; | |
1046 | |
1047 int _steal_attempts; | |
1048 int _steals; | |
1049 | |
1050 int _clock_due_to_marking; | |
1051 int _clock_due_to_scanning; | |
1052 | |
1053 int _local_pushes; | |
1054 int _local_pops; | |
1055 int _local_max_size; | |
1056 int _objs_scanned; | |
1057 | |
1058 int _global_pushes; | |
1059 int _global_pops; | |
1060 int _global_max_size; | |
1061 | |
1062 int _global_transfers_to; | |
1063 int _global_transfers_from; | |
1064 | |
1065 int _region_stack_pops; | |
1066 | |
1067 int _regions_claimed; | |
1068 int _objs_found_on_bitmap; | |
1069 | |
1070 int _satb_buffers_processed; | |
1071 #endif // _MARKING_STATS_ | |
1072 | |
1073 // it updates the local fields after this task has claimed | |
1074 // a new region to scan | |
1075 void setup_for_region(HeapRegion* hr); | |
1076 // it brings up-to-date the limit of the region | |
1077 void update_region_limit(); | |
1078 | |
1079 // called when either the words scanned or the refs visited limit | |
1080 // has been reached | |
1081 void reached_limit(); | |
1082 // recalculates the words scanned and refs visited limits | |
1083 void recalculate_limits(); | |
1084 // decreases the words scanned and refs visited limits when we reach | |
1085 // an expensive operation | |
1086 void decrease_limits(); | |
1087 // it checks whether the words scanned or refs visited reached their | |
1088 // respective limit and calls reached_limit() if they have | |
1089 void check_limits() { | |
1090 if (_words_scanned >= _words_scanned_limit || | |
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1091 _refs_reached >= _refs_reached_limit) { |
342 | 1092 reached_limit(); |
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1093 } |
342 | 1094 } |
1095 // this is supposed to be called regularly during a marking step as | |
1096 // it checks a bunch of conditions that might cause the marking step | |
1097 // to abort | |
1098 void regular_clock_call(); | |
1099 bool concurrent() { return _concurrent; } | |
1100 | |
1101 public: | |
1102 // It resets the task; it should be called right at the beginning of | |
1103 // a marking phase. | |
1104 void reset(CMBitMap* _nextMarkBitMap); | |
1105 // it clears all the fields that correspond to a claimed region. | |
1106 void clear_region_fields(); | |
1107 | |
1108 void set_concurrent(bool concurrent) { _concurrent = concurrent; } | |
1109 | |
1110 // The main method of this class which performs a marking step | |
1111 // trying not to exceed the given duration. However, it might exit | |
1112 // prematurely, according to some conditions (i.e. SATB buffers are | |
1113 // available for processing). | |
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1114 void do_marking_step(double target_ms, bool do_stealing, bool do_termination); |
342 | 1115 |
1116 // These two calls start and stop the timer | |
1117 void record_start_time() { | |
1118 _elapsed_time_ms = os::elapsedTime() * 1000.0; | |
1119 } | |
1120 void record_end_time() { | |
1121 _elapsed_time_ms = os::elapsedTime() * 1000.0 - _elapsed_time_ms; | |
1122 } | |
1123 | |
1124 // returns the task ID | |
1125 int task_id() { return _task_id; } | |
1126 | |
1127 // From TerminatorTerminator. It determines whether this task should | |
1128 // exit the termination protocol after it's entered it. | |
1129 virtual bool should_exit_termination(); | |
1130 | |
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1131 // Resets the local region fields after a task has finished scanning a |
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1132 // region; or when they have become stale as a result of the region |
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1133 // being evacuated. |
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1134 void giveup_current_region(); |
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1135 |
342 | 1136 HeapWord* finger() { return _finger; } |
1137 | |
1138 bool has_aborted() { return _has_aborted; } | |
1139 void set_has_aborted() { _has_aborted = true; } | |
1140 void clear_has_aborted() { _has_aborted = false; } | |
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1141 bool has_timed_out() { return _has_timed_out; } |
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1142 bool claimed() { return _claimed; } |
342 | 1143 |
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1144 // Support routines for the partially scanned region that may be |
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1145 // recorded as a result of aborting while draining the CMRegionStack |
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1146 MemRegion aborted_region() { return _aborted_region; } |
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1147 void set_aborted_region(MemRegion mr) |
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1148 { _aborted_region = mr; } |
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1149 |
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1150 // Clears any recorded partially scanned region |
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1151 void clear_aborted_region() { set_aborted_region(MemRegion()); } |
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1152 |
3771 | 1153 void set_cm_oop_closure(G1CMOopClosure* cm_oop_closure); |
342 | 1154 |
1155 // It grays the object by marking it and, if necessary, pushing it | |
1156 // on the local queue | |
3771 | 1157 inline void deal_with_reference(oop obj); |
342 | 1158 |
1159 // It scans an object and visits its children. | |
3771 | 1160 void scan_object(oop obj); |
342 | 1161 |
1162 // It pushes an object on the local queue. | |
3771 | 1163 inline void push(oop obj); |
342 | 1164 |
1165 // These two move entries to/from the global stack. | |
1166 void move_entries_to_global_stack(); | |
1167 void get_entries_from_global_stack(); | |
1168 | |
1169 // It pops and scans objects from the local queue. If partially is | |
1170 // true, then it stops when the queue size is of a given limit. If | |
1171 // partially is false, then it stops when the queue is empty. | |
1172 void drain_local_queue(bool partially); | |
1173 // It moves entries from the global stack to the local queue and | |
1174 // drains the local queue. If partially is true, then it stops when | |
1175 // both the global stack and the local queue reach a given size. If | |
1176 // partially if false, it tries to empty them totally. | |
1177 void drain_global_stack(bool partially); | |
1178 // It keeps picking SATB buffers and processing them until no SATB | |
1179 // buffers are available. | |
1180 void drain_satb_buffers(); | |
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1181 |
342 | 1182 // It keeps popping regions from the region stack and processing |
1183 // them until the region stack is empty. | |
1184 void drain_region_stack(BitMapClosure* closure); | |
1185 | |
1186 // moves the local finger to a new location | |
1187 inline void move_finger_to(HeapWord* new_finger) { | |
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1188 assert(new_finger >= _finger && new_finger < _region_limit, "invariant"); |
342 | 1189 _finger = new_finger; |
1190 } | |
1191 | |
1192 // moves the region finger to a new location | |
1193 inline void move_region_finger_to(HeapWord* new_finger) { | |
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1194 assert(new_finger < _cm->finger(), "invariant"); |
342 | 1195 _region_finger = new_finger; |
1196 } | |
1197 | |
1198 CMTask(int task_num, ConcurrentMark *cm, | |
1199 CMTaskQueue* task_queue, CMTaskQueueSet* task_queues); | |
1200 | |
1201 // it prints statistics associated with this task | |
1202 void print_stats(); | |
1203 | |
1204 #if _MARKING_STATS_ | |
1205 void increase_objs_found_on_bitmap() { ++_objs_found_on_bitmap; } | |
1206 #endif // _MARKING_STATS_ | |
1207 }; | |
1972 | 1208 |
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1209 // Class that's used to to print out per-region liveness |
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1210 // information. It's currently used at the end of marking and also |
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1211 // after we sort the old regions at the end of the cleanup operation. |
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1212 class G1PrintRegionLivenessInfoClosure: public HeapRegionClosure { |
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1213 private: |
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1214 outputStream* _out; |
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1215 |
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1216 // Accumulators for these values. |
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1217 size_t _total_used_bytes; |
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1218 size_t _total_capacity_bytes; |
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1219 size_t _total_prev_live_bytes; |
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1220 size_t _total_next_live_bytes; |
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1221 |
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1222 // These are set up when we come across a "stars humongous" region |
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1223 // (as this is where most of this information is stored, not in the |
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1224 // subsequent "continues humongous" regions). After that, for every |
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1225 // region in a given humongous region series we deduce the right |
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1226 // values for it by simply subtracting the appropriate amount from |
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1227 // these fields. All these values should reach 0 after we've visited |
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1228 // the last region in the series. |
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1229 size_t _hum_used_bytes; |
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1230 size_t _hum_capacity_bytes; |
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1231 size_t _hum_prev_live_bytes; |
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1232 size_t _hum_next_live_bytes; |
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1233 |
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1234 static double perc(size_t val, size_t total) { |
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1235 if (total == 0) { |
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1236 return 0.0; |
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1237 } else { |
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1238 return 100.0 * ((double) val / (double) total); |
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1239 } |
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1240 } |
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1241 |
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1242 static double bytes_to_mb(size_t val) { |
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1243 return (double) val / (double) M; |
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1244 } |
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1245 |
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1246 // See the .cpp file. |
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1247 size_t get_hum_bytes(size_t* hum_bytes); |
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1248 void get_hum_bytes(size_t* used_bytes, size_t* capacity_bytes, |
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1249 size_t* prev_live_bytes, size_t* next_live_bytes); |
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1250 |
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1251 public: |
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1252 // The header and footer are printed in the constructor and |
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1253 // destructor respectively. |
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1254 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name); |
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1255 virtual bool doHeapRegion(HeapRegion* r); |
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1256 ~G1PrintRegionLivenessInfoClosure(); |
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1257 }; |
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1258 |
1972 | 1259 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP |