Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.hpp @ 6615:09aad8452938
7190310: Inlining WeakReference.get(), and hoisting $referent may lead to non-terminating loops
Summary: In C2 add software membar after load from Reference.referent field to prevent commoning of loads across safepoint since GC can change its value. In C1 always generate Reference.get() intrinsic.
Reviewed-by: roland, twisti, dholmes, johnc
author | kvn |
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date | Mon, 20 Aug 2012 09:58:58 -0700 |
parents | d2a62e0f25eb |
children | 988bf00cc564 |
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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; | |
6197 | 33 typedef GenericTaskQueue<oop, mtGC> CMTaskQueue; |
34 typedef GenericTaskQueueSet<CMTaskQueue, mtGC> CMTaskQueueSet; | |
342 | 35 |
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36 // Closure used by CM during concurrent reference discovery |
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37 // and reference processing (during remarking) to determine |
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38 // if a particular object is alive. It is primarily used |
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39 // to determine if referents of discovered reference objects |
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40 // are alive. An instance is also embedded into the |
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41 // reference processor as the _is_alive_non_header field |
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42 class G1CMIsAliveClosure: public BoolObjectClosure { |
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43 G1CollectedHeap* _g1; |
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44 public: |
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45 G1CMIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) { } |
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46 |
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47 void do_object(oop obj) { |
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48 ShouldNotCallThis(); |
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49 } |
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50 bool do_object_b(oop obj); |
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51 }; |
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52 |
342 | 53 // A generic CM bit map. This is essentially a wrapper around the BitMap |
54 // class, with one bit per (1<<_shifter) HeapWords. | |
55 | |
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56 class CMBitMapRO VALUE_OBJ_CLASS_SPEC { |
342 | 57 protected: |
58 HeapWord* _bmStartWord; // base address of range covered by map | |
59 size_t _bmWordSize; // map size (in #HeapWords covered) | |
60 const int _shifter; // map to char or bit | |
61 VirtualSpace _virtual_space; // underlying the bit map | |
62 BitMap _bm; // the bit map itself | |
63 | |
64 public: | |
65 // constructor | |
66 CMBitMapRO(ReservedSpace rs, int shifter); | |
67 | |
68 enum { do_yield = true }; | |
69 | |
70 // inquiries | |
71 HeapWord* startWord() const { return _bmStartWord; } | |
72 size_t sizeInWords() const { return _bmWordSize; } | |
73 // the following is one past the last word in space | |
74 HeapWord* endWord() const { return _bmStartWord + _bmWordSize; } | |
75 | |
76 // read marks | |
77 | |
78 bool isMarked(HeapWord* addr) const { | |
79 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
80 "outside underlying space?"); | |
81 return _bm.at(heapWordToOffset(addr)); | |
82 } | |
83 | |
84 // iteration | |
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85 inline bool iterate(BitMapClosure* cl, MemRegion mr); |
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86 inline bool iterate(BitMapClosure* cl); |
342 | 87 |
88 // Return the address corresponding to the next marked bit at or after | |
89 // "addr", and before "limit", if "limit" is non-NULL. If there is no | |
90 // such bit, returns "limit" if that is non-NULL, or else "endWord()". | |
91 HeapWord* getNextMarkedWordAddress(HeapWord* addr, | |
92 HeapWord* limit = NULL) const; | |
93 // Return the address corresponding to the next unmarked bit at or after | |
94 // "addr", and before "limit", if "limit" is non-NULL. If there is no | |
95 // such bit, returns "limit" if that is non-NULL, or else "endWord()". | |
96 HeapWord* getNextUnmarkedWordAddress(HeapWord* addr, | |
97 HeapWord* limit = NULL) const; | |
98 | |
99 // conversion utilities | |
100 // XXX Fix these so that offsets are size_t's... | |
101 HeapWord* offsetToHeapWord(size_t offset) const { | |
102 return _bmStartWord + (offset << _shifter); | |
103 } | |
104 size_t heapWordToOffset(HeapWord* addr) const { | |
105 return pointer_delta(addr, _bmStartWord) >> _shifter; | |
106 } | |
107 int heapWordDiffToOffsetDiff(size_t diff) const; | |
108 HeapWord* nextWord(HeapWord* addr) { | |
109 return offsetToHeapWord(heapWordToOffset(addr) + 1); | |
110 } | |
111 | |
112 // debugging | |
113 NOT_PRODUCT(bool covers(ReservedSpace rs) const;) | |
114 }; | |
115 | |
116 class CMBitMap : public CMBitMapRO { | |
117 | |
118 public: | |
119 // constructor | |
120 CMBitMap(ReservedSpace rs, int shifter) : | |
121 CMBitMapRO(rs, shifter) {} | |
122 | |
123 // write marks | |
124 void mark(HeapWord* addr) { | |
125 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
126 "outside underlying space?"); | |
3771 | 127 _bm.set_bit(heapWordToOffset(addr)); |
342 | 128 } |
129 void clear(HeapWord* addr) { | |
130 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
131 "outside underlying space?"); | |
3771 | 132 _bm.clear_bit(heapWordToOffset(addr)); |
342 | 133 } |
134 bool parMark(HeapWord* addr) { | |
135 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
136 "outside underlying space?"); | |
3771 | 137 return _bm.par_set_bit(heapWordToOffset(addr)); |
342 | 138 } |
139 bool parClear(HeapWord* addr) { | |
140 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
141 "outside underlying space?"); | |
3771 | 142 return _bm.par_clear_bit(heapWordToOffset(addr)); |
342 | 143 } |
144 void markRange(MemRegion mr); | |
145 void clearAll(); | |
146 void clearRange(MemRegion mr); | |
147 | |
148 // Starting at the bit corresponding to "addr" (inclusive), find the next | |
149 // "1" bit, if any. This bit starts some run of consecutive "1"'s; find | |
150 // the end of this run (stopping at "end_addr"). Return the MemRegion | |
151 // covering from the start of the region corresponding to the first bit | |
152 // of the run to the end of the region corresponding to the last bit of | |
153 // the run. If there is no "1" bit at or after "addr", return an empty | |
154 // MemRegion. | |
155 MemRegion getAndClearMarkedRegion(HeapWord* addr, HeapWord* end_addr); | |
156 }; | |
157 | |
158 // Represents a marking stack used by the CM collector. | |
159 // Ideally this should be GrowableArray<> just like MSC's marking stack(s). | |
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160 class CMMarkStack VALUE_OBJ_CLASS_SPEC { |
342 | 161 ConcurrentMark* _cm; |
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162 oop* _base; // bottom of stack |
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163 jint _index; // one more than last occupied index |
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164 jint _capacity; // max #elements |
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165 jint _saved_index; // value of _index saved at start of GC |
342 | 166 NOT_PRODUCT(jint _max_depth;) // max depth plumbed during run |
167 | |
168 bool _overflow; | |
169 DEBUG_ONLY(bool _drain_in_progress;) | |
170 DEBUG_ONLY(bool _drain_in_progress_yields;) | |
171 | |
172 public: | |
173 CMMarkStack(ConcurrentMark* cm); | |
174 ~CMMarkStack(); | |
175 | |
176 void allocate(size_t size); | |
177 | |
178 oop pop() { | |
179 if (!isEmpty()) { | |
180 return _base[--_index] ; | |
181 } | |
182 return NULL; | |
183 } | |
184 | |
185 // If overflow happens, don't do the push, and record the overflow. | |
186 // *Requires* that "ptr" is already marked. | |
187 void push(oop ptr) { | |
188 if (isFull()) { | |
189 // Record overflow. | |
190 _overflow = true; | |
191 return; | |
192 } else { | |
193 _base[_index++] = ptr; | |
194 NOT_PRODUCT(_max_depth = MAX2(_max_depth, _index)); | |
195 } | |
196 } | |
197 // Non-block impl. Note: concurrency is allowed only with other | |
198 // "par_push" operations, not with "pop" or "drain". We would need | |
199 // parallel versions of them if such concurrency was desired. | |
200 void par_push(oop ptr); | |
201 | |
202 // Pushes the first "n" elements of "ptr_arr" on the stack. | |
203 // Non-block impl. Note: concurrency is allowed only with other | |
204 // "par_adjoin_arr" or "push" operations, not with "pop" or "drain". | |
205 void par_adjoin_arr(oop* ptr_arr, int n); | |
206 | |
207 // Pushes the first "n" elements of "ptr_arr" on the stack. | |
208 // Locking impl: concurrency is allowed only with | |
209 // "par_push_arr" and/or "par_pop_arr" operations, which use the same | |
210 // locking strategy. | |
211 void par_push_arr(oop* ptr_arr, int n); | |
212 | |
213 // If returns false, the array was empty. Otherwise, removes up to "max" | |
214 // elements from the stack, and transfers them to "ptr_arr" in an | |
215 // unspecified order. The actual number transferred is given in "n" ("n | |
216 // == 0" is deliberately redundant with the return value.) Locking impl: | |
217 // concurrency is allowed only with "par_push_arr" and/or "par_pop_arr" | |
218 // operations, which use the same locking strategy. | |
219 bool par_pop_arr(oop* ptr_arr, int max, int* n); | |
220 | |
221 // Drain the mark stack, applying the given closure to all fields of | |
222 // objects on the stack. (That is, continue until the stack is empty, | |
223 // even if closure applications add entries to the stack.) The "bm" | |
224 // argument, if non-null, may be used to verify that only marked objects | |
225 // are on the mark stack. If "yield_after" is "true", then the | |
226 // concurrent marker performing the drain offers to yield after | |
227 // processing each object. If a yield occurs, stops the drain operation | |
228 // and returns false. Otherwise, returns true. | |
229 template<class OopClosureClass> | |
230 bool drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after = false); | |
231 | |
232 bool isEmpty() { return _index == 0; } | |
233 bool isFull() { return _index == _capacity; } | |
234 int maxElems() { return _capacity; } | |
235 | |
236 bool overflow() { return _overflow; } | |
237 void clear_overflow() { _overflow = false; } | |
238 | |
239 int size() { return _index; } | |
240 | |
241 void setEmpty() { _index = 0; clear_overflow(); } | |
242 | |
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243 // Record the current index. |
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244 void note_start_of_gc(); |
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245 |
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246 // Make sure that we have not added any entries to the stack during GC. |
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247 void note_end_of_gc(); |
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248 |
342 | 249 // iterate over the oops in the mark stack, up to the bound recorded via |
250 // the call above. | |
251 void oops_do(OopClosure* f); | |
252 }; | |
253 | |
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254 class ForceOverflowSettings VALUE_OBJ_CLASS_SPEC { |
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255 private: |
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256 #ifndef PRODUCT |
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257 uintx _num_remaining; |
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258 bool _force; |
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259 #endif // !defined(PRODUCT) |
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260 |
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261 public: |
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262 void init() PRODUCT_RETURN; |
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263 void update() PRODUCT_RETURN; |
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264 bool should_force() PRODUCT_RETURN_( return false; ); |
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265 }; |
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266 |
342 | 267 // this will enable a variety of different statistics per GC task |
268 #define _MARKING_STATS_ 0 | |
269 // this will enable the higher verbose levels | |
270 #define _MARKING_VERBOSE_ 0 | |
271 | |
272 #if _MARKING_STATS_ | |
273 #define statsOnly(statement) \ | |
274 do { \ | |
275 statement ; \ | |
276 } while (0) | |
277 #else // _MARKING_STATS_ | |
278 #define statsOnly(statement) \ | |
279 do { \ | |
280 } while (0) | |
281 #endif // _MARKING_STATS_ | |
282 | |
283 typedef enum { | |
284 no_verbose = 0, // verbose turned off | |
285 stats_verbose, // only prints stats at the end of marking | |
286 low_verbose, // low verbose, mostly per region and per major event | |
287 medium_verbose, // a bit more detailed than low | |
288 high_verbose // per object verbose | |
289 } CMVerboseLevel; | |
290 | |
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291 class YoungList; |
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292 |
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293 // Root Regions are regions that are not empty at the beginning of a |
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294 // marking cycle and which we might collect during an evacuation pause |
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295 // while the cycle is active. Given that, during evacuation pauses, we |
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296 // do not copy objects that are explicitly marked, what we have to do |
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297 // for the root regions is to scan them and mark all objects reachable |
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298 // from them. According to the SATB assumptions, we only need to visit |
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299 // each object once during marking. So, as long as we finish this scan |
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300 // before the next evacuation pause, we can copy the objects from the |
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301 // root regions without having to mark them or do anything else to them. |
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302 // |
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303 // Currently, we only support root region scanning once (at the start |
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304 // of the marking cycle) and the root regions are all the survivor |
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305 // regions populated during the initial-mark pause. |
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306 class CMRootRegions VALUE_OBJ_CLASS_SPEC { |
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307 private: |
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308 YoungList* _young_list; |
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309 ConcurrentMark* _cm; |
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310 |
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311 volatile bool _scan_in_progress; |
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312 volatile bool _should_abort; |
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313 HeapRegion* volatile _next_survivor; |
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314 |
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315 public: |
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316 CMRootRegions(); |
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317 // We actually do most of the initialization in this method. |
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318 void init(G1CollectedHeap* g1h, ConcurrentMark* cm); |
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319 |
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320 // Reset the claiming / scanning of the root regions. |
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321 void prepare_for_scan(); |
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322 |
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323 // Forces get_next() to return NULL so that the iteration aborts early. |
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324 void abort() { _should_abort = true; } |
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325 |
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326 // Return true if the CM thread are actively scanning root regions, |
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327 // false otherwise. |
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328 bool scan_in_progress() { return _scan_in_progress; } |
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329 |
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330 // Claim the next root region to scan atomically, or return NULL if |
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331 // all have been claimed. |
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332 HeapRegion* claim_next(); |
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333 |
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334 // Flag that we're done with root region scanning and notify anyone |
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335 // who's waiting on it. If aborted is false, assume that all regions |
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336 // have been claimed. |
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337 void scan_finished(); |
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338 |
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339 // If CM threads are still scanning root regions, wait until they |
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340 // are done. Return true if we had to wait, false otherwise. |
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341 bool wait_until_scan_finished(); |
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342 }; |
342 | 343 |
344 class ConcurrentMarkThread; | |
345 | |
6197 | 346 class ConcurrentMark: public CHeapObj<mtGC> { |
342 | 347 friend class ConcurrentMarkThread; |
348 friend class CMTask; | |
349 friend class CMBitMapClosure; | |
350 friend class CMGlobalObjectClosure; | |
351 friend class CMRemarkTask; | |
352 friend class CMConcurrentMarkingTask; | |
353 friend class G1ParNoteEndTask; | |
354 friend class CalcLiveObjectsClosure; | |
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355 friend class G1CMRefProcTaskProxy; |
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356 friend class G1CMRefProcTaskExecutor; |
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357 friend class G1CMParKeepAliveAndDrainClosure; |
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358 friend class G1CMParDrainMarkingStackClosure; |
342 | 359 |
360 protected: | |
361 ConcurrentMarkThread* _cmThread; // the thread doing the work | |
362 G1CollectedHeap* _g1h; // the heap. | |
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363 uint _parallel_marking_threads; // the number of marking |
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364 // threads we're use |
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365 uint _max_parallel_marking_threads; // max number of marking |
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366 // threads we'll ever use |
342 | 367 double _sleep_factor; // how much we have to sleep, with |
368 // respect to the work we just did, to | |
369 // meet the marking overhead goal | |
370 double _marking_task_overhead; // marking target overhead for | |
371 // a single task | |
372 | |
373 // same as the two above, but for the cleanup task | |
374 double _cleanup_sleep_factor; | |
375 double _cleanup_task_overhead; | |
376 | |
2152 | 377 FreeRegionList _cleanup_list; |
342 | 378 |
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379 // Concurrent marking support structures |
342 | 380 CMBitMap _markBitMap1; |
381 CMBitMap _markBitMap2; | |
382 CMBitMapRO* _prevMarkBitMap; // completed mark bitmap | |
383 CMBitMap* _nextMarkBitMap; // under-construction mark bitmap | |
384 | |
385 BitMap _region_bm; | |
386 BitMap _card_bm; | |
387 | |
388 // Heap bounds | |
389 HeapWord* _heap_start; | |
390 HeapWord* _heap_end; | |
391 | |
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392 // Root region tracking and claiming. |
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393 CMRootRegions _root_regions; |
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394 |
342 | 395 // For gray objects |
396 CMMarkStack _markStack; // Grey objects behind global finger. | |
397 HeapWord* volatile _finger; // the global finger, region aligned, | |
398 // always points to the end of the | |
399 // last claimed region | |
400 | |
401 // marking tasks | |
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402 uint _max_task_num; // maximum task number |
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403 uint _active_tasks; // task num currently active |
342 | 404 CMTask** _tasks; // task queue array (max_task_num len) |
405 CMTaskQueueSet* _task_queues; // task queue set | |
406 ParallelTaskTerminator _terminator; // for termination | |
407 | |
408 // Two sync barriers that are used to synchronise tasks when an | |
409 // overflow occurs. The algorithm is the following. All tasks enter | |
410 // the first one to ensure that they have all stopped manipulating | |
411 // the global data structures. After they exit it, they re-initialise | |
412 // their data structures and task 0 re-initialises the global data | |
413 // structures. Then, they enter the second sync barrier. This | |
414 // ensure, that no task starts doing work before all data | |
415 // structures (local and global) have been re-initialised. When they | |
416 // exit it, they are free to start working again. | |
417 WorkGangBarrierSync _first_overflow_barrier_sync; | |
418 WorkGangBarrierSync _second_overflow_barrier_sync; | |
419 | |
420 // this is set by any task, when an overflow on the global data | |
421 // structures is detected. | |
422 volatile bool _has_overflown; | |
423 // true: marking is concurrent, false: we're in remark | |
424 volatile bool _concurrent; | |
425 // set at the end of a Full GC so that marking aborts | |
426 volatile bool _has_aborted; | |
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427 |
342 | 428 // used when remark aborts due to an overflow to indicate that |
429 // another concurrent marking phase should start | |
430 volatile bool _restart_for_overflow; | |
431 | |
432 // This is true from the very start of concurrent marking until the | |
433 // point when all the tasks complete their work. It is really used | |
434 // to determine the points between the end of concurrent marking and | |
435 // time of remark. | |
436 volatile bool _concurrent_marking_in_progress; | |
437 | |
438 // verbose level | |
439 CMVerboseLevel _verbose_level; | |
440 | |
441 // All of these times are in ms. | |
442 NumberSeq _init_times; | |
443 NumberSeq _remark_times; | |
444 NumberSeq _remark_mark_times; | |
445 NumberSeq _remark_weak_ref_times; | |
446 NumberSeq _cleanup_times; | |
447 double _total_counting_time; | |
448 double _total_rs_scrub_time; | |
449 | |
450 double* _accum_task_vtime; // accumulated task vtime | |
451 | |
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452 FlexibleWorkGang* _parallel_workers; |
342 | 453 |
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454 ForceOverflowSettings _force_overflow_conc; |
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455 ForceOverflowSettings _force_overflow_stw; |
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456 |
342 | 457 void weakRefsWork(bool clear_all_soft_refs); |
458 | |
459 void swapMarkBitMaps(); | |
460 | |
461 // It resets the global marking data structures, as well as the | |
462 // task local ones; should be called during initial mark. | |
463 void reset(); | |
464 // It resets all the marking data structures. | |
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465 void clear_marking_state(bool clear_overflow = true); |
342 | 466 |
467 // It should be called to indicate which phase we're in (concurrent | |
468 // mark or remark) and how many threads are currently active. | |
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469 void set_phase(uint active_tasks, bool concurrent); |
342 | 470 // We do this after we're done with marking so that the marking data |
471 // structures are initialised to a sensible and predictable state. | |
472 void set_non_marking_state(); | |
473 | |
474 // prints all gathered CM-related statistics | |
475 void print_stats(); | |
476 | |
2152 | 477 bool cleanup_list_is_empty() { |
478 return _cleanup_list.is_empty(); | |
479 } | |
480 | |
342 | 481 // accessor methods |
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482 uint parallel_marking_threads() { return _parallel_marking_threads; } |
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483 uint max_parallel_marking_threads() { return _max_parallel_marking_threads;} |
342 | 484 double sleep_factor() { return _sleep_factor; } |
485 double marking_task_overhead() { return _marking_task_overhead;} | |
486 double cleanup_sleep_factor() { return _cleanup_sleep_factor; } | |
487 double cleanup_task_overhead() { return _cleanup_task_overhead;} | |
488 | |
489 HeapWord* finger() { return _finger; } | |
490 bool concurrent() { return _concurrent; } | |
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491 uint active_tasks() { return _active_tasks; } |
342 | 492 ParallelTaskTerminator* terminator() { return &_terminator; } |
493 | |
494 // It claims the next available region to be scanned by a marking | |
495 // task. It might return NULL if the next region is empty or we have | |
496 // run out of regions. In the latter case, out_of_regions() | |
497 // determines whether we've really run out of regions or the task | |
498 // should call claim_region() again. This might seem a bit | |
499 // awkward. Originally, the code was written so that claim_region() | |
500 // either successfully returned with a non-empty region or there | |
501 // were no more regions to be claimed. The problem with this was | |
502 // that, in certain circumstances, it iterated over large chunks of | |
503 // the heap finding only empty regions and, while it was working, it | |
504 // was preventing the calling task to call its regular clock | |
505 // method. So, this way, each task will spend very little time in | |
506 // claim_region() and is allowed to call the regular clock method | |
507 // frequently. | |
508 HeapRegion* claim_region(int task); | |
509 | |
510 // It determines whether we've run out of regions to scan. | |
511 bool out_of_regions() { return _finger == _heap_end; } | |
512 | |
513 // Returns the task with the given id | |
514 CMTask* task(int id) { | |
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515 assert(0 <= id && id < (int) _active_tasks, |
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516 "task id not within active bounds"); |
342 | 517 return _tasks[id]; |
518 } | |
519 | |
520 // Returns the task queue with the given id | |
521 CMTaskQueue* task_queue(int id) { | |
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522 assert(0 <= id && id < (int) _active_tasks, |
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523 "task queue id not within active bounds"); |
342 | 524 return (CMTaskQueue*) _task_queues->queue(id); |
525 } | |
526 | |
527 // Returns the task queue set | |
528 CMTaskQueueSet* task_queues() { return _task_queues; } | |
529 | |
530 // Access / manipulation of the overflow flag which is set to | |
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531 // indicate that the global stack has overflown |
342 | 532 bool has_overflown() { return _has_overflown; } |
533 void set_has_overflown() { _has_overflown = true; } | |
534 void clear_has_overflown() { _has_overflown = false; } | |
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535 bool restart_for_overflow() { return _restart_for_overflow; } |
342 | 536 |
537 bool has_aborted() { return _has_aborted; } | |
538 | |
539 // Methods to enter the two overflow sync barriers | |
540 void enter_first_sync_barrier(int task_num); | |
541 void enter_second_sync_barrier(int task_num); | |
542 | |
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543 ForceOverflowSettings* force_overflow_conc() { |
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544 return &_force_overflow_conc; |
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545 } |
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546 |
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547 ForceOverflowSettings* force_overflow_stw() { |
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548 return &_force_overflow_stw; |
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549 } |
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550 |
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551 ForceOverflowSettings* force_overflow() { |
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552 if (concurrent()) { |
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553 return force_overflow_conc(); |
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554 } else { |
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555 return force_overflow_stw(); |
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556 } |
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557 } |
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558 |
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559 // Live Data Counting data structures... |
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560 // These data structures are initialized at the start of |
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561 // marking. They are written to while marking is active. |
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562 // They are aggregated during remark; the aggregated values |
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563 // are then used to populate the _region_bm, _card_bm, and |
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564 // the total live bytes, which are then subsequently updated |
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565 // during cleanup. |
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566 |
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567 // An array of bitmaps (one bit map per task). Each bitmap |
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568 // is used to record the cards spanned by the live objects |
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569 // marked by that task/worker. |
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570 BitMap* _count_card_bitmaps; |
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571 |
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572 // Used to record the number of marked live bytes |
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573 // (for each region, by worker thread). |
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574 size_t** _count_marked_bytes; |
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575 |
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576 // Card index of the bottom of the G1 heap. Used for biasing indices into |
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577 // the card bitmaps. |
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578 intptr_t _heap_bottom_card_num; |
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579 |
342 | 580 public: |
581 // Manipulation of the global mark stack. | |
582 // Notice that the first mark_stack_push is CAS-based, whereas the | |
583 // two below are Mutex-based. This is OK since the first one is only | |
584 // called during evacuation pauses and doesn't compete with the | |
585 // other two (which are called by the marking tasks during | |
586 // concurrent marking or remark). | |
587 bool mark_stack_push(oop p) { | |
588 _markStack.par_push(p); | |
589 if (_markStack.overflow()) { | |
590 set_has_overflown(); | |
591 return false; | |
592 } | |
593 return true; | |
594 } | |
595 bool mark_stack_push(oop* arr, int n) { | |
596 _markStack.par_push_arr(arr, n); | |
597 if (_markStack.overflow()) { | |
598 set_has_overflown(); | |
599 return false; | |
600 } | |
601 return true; | |
602 } | |
603 void mark_stack_pop(oop* arr, int max, int* n) { | |
604 _markStack.par_pop_arr(arr, max, n); | |
605 } | |
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606 size_t mark_stack_size() { return _markStack.size(); } |
342 | 607 size_t partial_mark_stack_size_target() { return _markStack.maxElems()/3; } |
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608 bool mark_stack_overflow() { return _markStack.overflow(); } |
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609 bool mark_stack_empty() { return _markStack.isEmpty(); } |
342 | 610 |
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611 CMRootRegions* root_regions() { return &_root_regions; } |
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612 |
342 | 613 bool concurrent_marking_in_progress() { |
614 return _concurrent_marking_in_progress; | |
615 } | |
616 void set_concurrent_marking_in_progress() { | |
617 _concurrent_marking_in_progress = true; | |
618 } | |
619 void clear_concurrent_marking_in_progress() { | |
620 _concurrent_marking_in_progress = false; | |
621 } | |
622 | |
623 void update_accum_task_vtime(int i, double vtime) { | |
624 _accum_task_vtime[i] += vtime; | |
625 } | |
626 | |
627 double all_task_accum_vtime() { | |
628 double ret = 0.0; | |
629 for (int i = 0; i < (int)_max_task_num; ++i) | |
630 ret += _accum_task_vtime[i]; | |
631 return ret; | |
632 } | |
633 | |
634 // Attempts to steal an object from the task queues of other tasks | |
635 bool try_stealing(int task_num, int* hash_seed, oop& obj) { | |
636 return _task_queues->steal(task_num, hash_seed, obj); | |
637 } | |
638 | |
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639 ConcurrentMark(ReservedSpace rs, uint max_regions); |
342 | 640 ~ConcurrentMark(); |
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641 |
342 | 642 ConcurrentMarkThread* cmThread() { return _cmThread; } |
643 | |
644 CMBitMapRO* prevMarkBitMap() const { return _prevMarkBitMap; } | |
645 CMBitMap* nextMarkBitMap() const { return _nextMarkBitMap; } | |
646 | |
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647 // Returns the number of GC threads to be used in a concurrent |
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648 // phase based on the number of GC threads being used in a STW |
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649 // phase. |
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650 uint scale_parallel_threads(uint n_par_threads); |
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651 |
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652 // Calculates the number of GC threads to be used in a concurrent phase. |
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653 uint calc_parallel_marking_threads(); |
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654 |
342 | 655 // The following three are interaction between CM and |
656 // G1CollectedHeap | |
657 | |
658 // This notifies CM that a root during initial-mark needs to be | |
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659 // grayed. It is MT-safe. word_size is the size of the object in |
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660 // words. It is passed explicitly as sometimes we cannot calculate |
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661 // it from the given object because it might be in an inconsistent |
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662 // state (e.g., in to-space and being copied). So the caller is |
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663 // responsible for dealing with this issue (e.g., get the size from |
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664 // the from-space image when the to-space image might be |
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665 // inconsistent) and always passing the size. hr is the region that |
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666 // contains the object and it's passed optionally from callers who |
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667 // might already have it (no point in recalculating it). |
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668 inline void grayRoot(oop obj, size_t word_size, |
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669 uint worker_id, HeapRegion* hr = NULL); |
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670 |
1388 | 671 // It iterates over the heap and for each object it comes across it |
672 // will dump the contents of its reference fields, as well as | |
673 // liveness information for the object and its referents. The dump | |
674 // will be written to a file with the following name: | |
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675 // G1PrintReachableBaseFile + "." + str. |
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676 // vo decides whether the prev (vo == UsePrevMarking), the next |
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677 // (vo == UseNextMarking) marking information, or the mark word |
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678 // (vo == UseMarkWord) will be used to determine the liveness of |
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679 // each object / referent. |
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680 // If all is true, all objects in the heap will be dumped, otherwise |
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681 // only the live ones. In the dump the following symbols / breviations |
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682 // are used: |
1388 | 683 // M : an explicitly live object (its bitmap bit is set) |
684 // > : an implicitly live object (over tams) | |
685 // O : an object outside the G1 heap (typically: in the perm gen) | |
686 // NOT : a reference field whose referent is not live | |
687 // AND MARKED : indicates that an object is both explicitly and | |
688 // implicitly live (it should be one or the other, not both) | |
689 void print_reachable(const char* str, | |
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690 VerifyOption vo, bool all) PRODUCT_RETURN; |
342 | 691 |
692 // Clear the next marking bitmap (will be called concurrently). | |
693 void clearNextBitmap(); | |
694 | |
695 // These two do the work that needs to be done before and after the | |
696 // initial root checkpoint. Since this checkpoint can be done at two | |
697 // different points (i.e. an explicit pause or piggy-backed on a | |
698 // young collection), then it's nice to be able to easily share the | |
699 // pre/post code. It might be the case that we can put everything in | |
700 // the post method. TP | |
701 void checkpointRootsInitialPre(); | |
702 void checkpointRootsInitialPost(); | |
703 | |
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704 // Scan all the root regions and mark everything reachable from |
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705 // them. |
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706 void scanRootRegions(); |
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707 |
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708 // Scan a single root region and mark everything reachable from it. |
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709 void scanRootRegion(HeapRegion* hr, uint worker_id); |
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710 |
342 | 711 // Do concurrent phase of marking, to a tentative transitive closure. |
712 void markFromRoots(); | |
713 | |
714 void checkpointRootsFinal(bool clear_all_soft_refs); | |
715 void checkpointRootsFinalWork(); | |
716 void cleanup(); | |
717 void completeCleanup(); | |
718 | |
719 // Mark in the previous bitmap. NB: this is usually read-only, so use | |
720 // this carefully! | |
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721 inline void markPrev(oop p); |
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722 |
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723 // Clears marks for all objects in the given range, for the prev, |
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724 // next, or both bitmaps. NB: the previous bitmap is usually |
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725 // read-only, so use this carefully! |
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726 void clearRangePrevBitmap(MemRegion mr); |
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727 void clearRangeNextBitmap(MemRegion mr); |
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728 void clearRangeBothBitmaps(MemRegion mr); |
342 | 729 |
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730 // Notify data structures that a GC has started. |
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731 void note_start_of_gc() { |
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732 _markStack.note_start_of_gc(); |
342 | 733 } |
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734 |
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735 // Notify data structures that a GC is finished. |
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736 void note_end_of_gc() { |
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737 _markStack.note_end_of_gc(); |
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738 } |
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739 |
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740 // Verify that there are no CSet oops on the stacks (taskqueues / |
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741 // global mark stack), enqueued SATB buffers, per-thread SATB |
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742 // buffers, and fingers (global / per-task). The boolean parameters |
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743 // decide which of the above data structures to verify. If marking |
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744 // is not in progress, it's a no-op. |
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745 void verify_no_cset_oops(bool verify_stacks, |
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746 bool verify_enqueued_buffers, |
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747 bool verify_thread_buffers, |
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748 bool verify_fingers) PRODUCT_RETURN; |
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749 |
342 | 750 // It is called at the end of an evacuation pause during marking so |
751 // that CM is notified of where the new end of the heap is. It | |
752 // doesn't do anything if concurrent_marking_in_progress() is false, | |
753 // unless the force parameter is true. | |
754 void update_g1_committed(bool force = false); | |
755 | |
756 bool isMarked(oop p) const { | |
757 assert(p != NULL && p->is_oop(), "expected an oop"); | |
758 HeapWord* addr = (HeapWord*)p; | |
759 assert(addr >= _nextMarkBitMap->startWord() || | |
760 addr < _nextMarkBitMap->endWord(), "in a region"); | |
761 | |
762 return _nextMarkBitMap->isMarked(addr); | |
763 } | |
764 | |
765 inline bool not_yet_marked(oop p) const; | |
766 | |
767 // XXX Debug code | |
768 bool containing_card_is_marked(void* p); | |
769 bool containing_cards_are_marked(void* start, void* last); | |
770 | |
771 bool isPrevMarked(oop p) const { | |
772 assert(p != NULL && p->is_oop(), "expected an oop"); | |
773 HeapWord* addr = (HeapWord*)p; | |
774 assert(addr >= _prevMarkBitMap->startWord() || | |
775 addr < _prevMarkBitMap->endWord(), "in a region"); | |
776 | |
777 return _prevMarkBitMap->isMarked(addr); | |
778 } | |
779 | |
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780 inline bool do_yield_check(uint worker_i = 0); |
342 | 781 inline bool should_yield(); |
782 | |
783 // Called to abort the marking cycle after a Full GC takes palce. | |
784 void abort(); | |
785 | |
786 // This prints the global/local fingers. It is used for debugging. | |
787 NOT_PRODUCT(void print_finger();) | |
788 | |
789 void print_summary_info(); | |
790 | |
1019 | 791 void print_worker_threads_on(outputStream* st) const; |
792 | |
342 | 793 // The following indicate whether a given verbose level has been |
794 // set. Notice that anything above stats is conditional to | |
795 // _MARKING_VERBOSE_ having been set to 1 | |
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796 bool verbose_stats() { |
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797 return _verbose_level >= stats_verbose; |
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798 } |
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799 bool verbose_low() { |
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800 return _MARKING_VERBOSE_ && _verbose_level >= low_verbose; |
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801 } |
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802 bool verbose_medium() { |
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803 return _MARKING_VERBOSE_ && _verbose_level >= medium_verbose; |
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804 } |
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805 bool verbose_high() { |
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806 return _MARKING_VERBOSE_ && _verbose_level >= high_verbose; |
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807 } |
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808 |
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809 // Counting data structure accessors |
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810 |
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811 // Returns the card number of the bottom of the G1 heap. |
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812 // Used in biasing indices into accounting card bitmaps. |
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813 intptr_t heap_bottom_card_num() const { |
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814 return _heap_bottom_card_num; |
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815 } |
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816 |
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817 // Returns the card bitmap for a given task or worker id. |
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818 BitMap* count_card_bitmap_for(uint worker_id) { |
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819 assert(0 <= worker_id && worker_id < _max_task_num, "oob"); |
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820 assert(_count_card_bitmaps != NULL, "uninitialized"); |
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821 BitMap* task_card_bm = &_count_card_bitmaps[worker_id]; |
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822 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
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823 return task_card_bm; |
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824 } |
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825 |
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826 // Returns the array containing the marked bytes for each region, |
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827 // for the given worker or task id. |
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828 size_t* count_marked_bytes_array_for(uint worker_id) { |
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829 assert(0 <= worker_id && worker_id < _max_task_num, "oob"); |
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830 assert(_count_marked_bytes != NULL, "uninitialized"); |
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831 size_t* marked_bytes_array = _count_marked_bytes[worker_id]; |
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832 assert(marked_bytes_array != NULL, "uninitialized"); |
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833 return marked_bytes_array; |
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834 } |
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835 |
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836 // Returns the index in the liveness accounting card table bitmap |
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837 // for the given address |
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838 inline BitMap::idx_t card_bitmap_index_for(HeapWord* addr); |
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839 |
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840 // Counts the size of the given memory region in the the given |
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841 // marked_bytes array slot for the given HeapRegion. |
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842 // Sets the bits in the given card bitmap that are associated with the |
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843 // cards that are spanned by the memory region. |
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844 inline void count_region(MemRegion mr, HeapRegion* hr, |
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845 size_t* marked_bytes_array, |
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846 BitMap* task_card_bm); |
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847 |
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848 // Counts the given memory region in the task/worker counting |
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849 // data structures for the given worker id. |
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850 inline void count_region(MemRegion mr, HeapRegion* hr, uint worker_id); |
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851 |
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852 // Counts the given memory region in the task/worker counting |
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853 // data structures for the given worker id. |
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854 inline void count_region(MemRegion mr, uint worker_id); |
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855 |
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856 // Counts the given object in the given task/worker counting |
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857 // data structures. |
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858 inline void count_object(oop obj, HeapRegion* hr, |
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859 size_t* marked_bytes_array, |
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860 BitMap* task_card_bm); |
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861 |
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862 // Counts the given object in the task/worker counting data |
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863 // structures for the given worker id. |
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864 inline void count_object(oop obj, HeapRegion* hr, uint worker_id); |
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865 |
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866 // Attempts to mark the given object and, if successful, counts |
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867 // the object in the given task/worker counting structures. |
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868 inline bool par_mark_and_count(oop obj, HeapRegion* hr, |
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869 size_t* marked_bytes_array, |
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870 BitMap* task_card_bm); |
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871 |
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872 // Attempts to mark the given object and, if successful, counts |
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873 // the object in the task/worker counting structures for the |
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874 // given worker id. |
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875 inline bool par_mark_and_count(oop obj, size_t word_size, |
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876 HeapRegion* hr, uint worker_id); |
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877 |
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878 // Attempts to mark the given object and, if successful, counts |
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879 // the object in the task/worker counting structures for the |
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880 // given worker id. |
4836
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881 inline bool par_mark_and_count(oop obj, HeapRegion* hr, uint worker_id); |
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882 |
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883 // Similar to the above routine but we don't know the heap region that |
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884 // contains the object to be marked/counted, which this routine looks up. |
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885 inline bool par_mark_and_count(oop obj, uint worker_id); |
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886 |
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887 // Similar to the above routine but there are times when we cannot |
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888 // safely calculate the size of obj due to races and we, therefore, |
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889 // pass the size in as a parameter. It is the caller's reponsibility |
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890 // to ensure that the size passed in for obj is valid. |
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891 inline bool par_mark_and_count(oop obj, size_t word_size, uint worker_id); |
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892 |
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893 // Unconditionally mark the given object, and unconditinally count |
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894 // the object in the counting structures for worker id 0. |
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895 // Should *not* be called from parallel code. |
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896 inline bool mark_and_count(oop obj, HeapRegion* hr); |
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897 |
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898 // Similar to the above routine but we don't know the heap region that |
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899 // contains the object to be marked/counted, which this routine looks up. |
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900 // Should *not* be called from parallel code. |
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901 inline bool mark_and_count(oop obj); |
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902 |
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903 protected: |
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904 // Clear all the per-task bitmaps and arrays used to store the |
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905 // counting data. |
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906 void clear_all_count_data(); |
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907 |
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908 // Aggregates the counting data for each worker/task |
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909 // that was constructed while marking. Also sets |
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910 // the amount of marked bytes for each region and |
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911 // the top at concurrent mark count. |
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912 void aggregate_count_data(); |
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913 |
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914 // Verification routine |
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915 void verify_count_data(); |
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; | |
845
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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 // the number of words this task has scanned | |
968 size_t _words_scanned; | |
969 // When _words_scanned reaches this limit, the regular clock is | |
970 // called. Notice that this might be decreased under certain | |
971 // circumstances (i.e. when we believe that we did an expensive | |
972 // operation). | |
973 size_t _words_scanned_limit; | |
974 // the initial value of _words_scanned_limit (i.e. what it was | |
975 // before it was decreased). | |
976 size_t _real_words_scanned_limit; | |
977 | |
978 // the number of references this task has visited | |
979 size_t _refs_reached; | |
980 // When _refs_reached reaches this limit, the regular clock is | |
981 // called. Notice this this might be decreased under certain | |
982 // circumstances (i.e. when we believe that we did an expensive | |
983 // operation). | |
984 size_t _refs_reached_limit; | |
985 // the initial value of _refs_reached_limit (i.e. what it was before | |
986 // it was decreased). | |
987 size_t _real_refs_reached_limit; | |
988 | |
989 // used by the work stealing stuff | |
990 int _hash_seed; | |
991 // if this is true, then the task has aborted for some reason | |
992 bool _has_aborted; | |
993 // set when the task aborts because it has met its time quota | |
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994 bool _has_timed_out; |
342 | 995 // true when we're draining SATB buffers; this avoids the task |
996 // aborting due to SATB buffers being available (as we're already | |
997 // dealing with them) | |
998 bool _draining_satb_buffers; | |
999 | |
1000 // number sequence of past step times | |
1001 NumberSeq _step_times_ms; | |
1002 // elapsed time of this task | |
1003 double _elapsed_time_ms; | |
1004 // termination time of this task | |
1005 double _termination_time_ms; | |
1006 // when this task got into the termination protocol | |
1007 double _termination_start_time_ms; | |
1008 | |
1009 // true when the task is during a concurrent phase, false when it is | |
1010 // in the remark phase (so, in the latter case, we do not have to | |
1011 // check all the things that we have to check during the concurrent | |
1012 // phase, i.e. SATB buffer availability...) | |
1013 bool _concurrent; | |
1014 | |
1015 TruncatedSeq _marking_step_diffs_ms; | |
1016 | |
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1017 // Counting data structures. Embedding the task's marked_bytes_array |
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1018 // and card bitmap into the actual task saves having to go through |
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1019 // the ConcurrentMark object. |
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1020 size_t* _marked_bytes_array; |
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1021 BitMap* _card_bm; |
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1022 |
342 | 1023 // LOTS of statistics related with this task |
1024 #if _MARKING_STATS_ | |
1025 NumberSeq _all_clock_intervals_ms; | |
1026 double _interval_start_time_ms; | |
1027 | |
1028 int _aborted; | |
1029 int _aborted_overflow; | |
1030 int _aborted_cm_aborted; | |
1031 int _aborted_yield; | |
1032 int _aborted_timed_out; | |
1033 int _aborted_satb; | |
1034 int _aborted_termination; | |
1035 | |
1036 int _steal_attempts; | |
1037 int _steals; | |
1038 | |
1039 int _clock_due_to_marking; | |
1040 int _clock_due_to_scanning; | |
1041 | |
1042 int _local_pushes; | |
1043 int _local_pops; | |
1044 int _local_max_size; | |
1045 int _objs_scanned; | |
1046 | |
1047 int _global_pushes; | |
1048 int _global_pops; | |
1049 int _global_max_size; | |
1050 | |
1051 int _global_transfers_to; | |
1052 int _global_transfers_from; | |
1053 | |
1054 int _regions_claimed; | |
1055 int _objs_found_on_bitmap; | |
1056 | |
1057 int _satb_buffers_processed; | |
1058 #endif // _MARKING_STATS_ | |
1059 | |
1060 // it updates the local fields after this task has claimed | |
1061 // a new region to scan | |
1062 void setup_for_region(HeapRegion* hr); | |
1063 // it brings up-to-date the limit of the region | |
1064 void update_region_limit(); | |
1065 | |
1066 // called when either the words scanned or the refs visited limit | |
1067 // has been reached | |
1068 void reached_limit(); | |
1069 // recalculates the words scanned and refs visited limits | |
1070 void recalculate_limits(); | |
1071 // decreases the words scanned and refs visited limits when we reach | |
1072 // an expensive operation | |
1073 void decrease_limits(); | |
1074 // it checks whether the words scanned or refs visited reached their | |
1075 // respective limit and calls reached_limit() if they have | |
1076 void check_limits() { | |
1077 if (_words_scanned >= _words_scanned_limit || | |
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1078 _refs_reached >= _refs_reached_limit) { |
342 | 1079 reached_limit(); |
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1080 } |
342 | 1081 } |
1082 // this is supposed to be called regularly during a marking step as | |
1083 // it checks a bunch of conditions that might cause the marking step | |
1084 // to abort | |
1085 void regular_clock_call(); | |
1086 bool concurrent() { return _concurrent; } | |
1087 | |
1088 public: | |
1089 // It resets the task; it should be called right at the beginning of | |
1090 // a marking phase. | |
1091 void reset(CMBitMap* _nextMarkBitMap); | |
1092 // it clears all the fields that correspond to a claimed region. | |
1093 void clear_region_fields(); | |
1094 | |
1095 void set_concurrent(bool concurrent) { _concurrent = concurrent; } | |
1096 | |
1097 // The main method of this class which performs a marking step | |
1098 // trying not to exceed the given duration. However, it might exit | |
1099 // prematurely, according to some conditions (i.e. SATB buffers are | |
1100 // available for processing). | |
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1101 void do_marking_step(double target_ms, bool do_stealing, bool do_termination); |
342 | 1102 |
1103 // These two calls start and stop the timer | |
1104 void record_start_time() { | |
1105 _elapsed_time_ms = os::elapsedTime() * 1000.0; | |
1106 } | |
1107 void record_end_time() { | |
1108 _elapsed_time_ms = os::elapsedTime() * 1000.0 - _elapsed_time_ms; | |
1109 } | |
1110 | |
1111 // returns the task ID | |
1112 int task_id() { return _task_id; } | |
1113 | |
1114 // From TerminatorTerminator. It determines whether this task should | |
1115 // exit the termination protocol after it's entered it. | |
1116 virtual bool should_exit_termination(); | |
1117 | |
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1118 // Resets the local region fields after a task has finished scanning a |
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1119 // region; or when they have become stale as a result of the region |
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1120 // being evacuated. |
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1121 void giveup_current_region(); |
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1122 |
342 | 1123 HeapWord* finger() { return _finger; } |
1124 | |
1125 bool has_aborted() { return _has_aborted; } | |
1126 void set_has_aborted() { _has_aborted = true; } | |
1127 void clear_has_aborted() { _has_aborted = false; } | |
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1128 bool has_timed_out() { return _has_timed_out; } |
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1129 bool claimed() { return _claimed; } |
342 | 1130 |
3771 | 1131 void set_cm_oop_closure(G1CMOopClosure* cm_oop_closure); |
342 | 1132 |
1133 // It grays the object by marking it and, if necessary, pushing it | |
1134 // on the local queue | |
3771 | 1135 inline void deal_with_reference(oop obj); |
342 | 1136 |
1137 // It scans an object and visits its children. | |
3771 | 1138 void scan_object(oop obj); |
342 | 1139 |
1140 // It pushes an object on the local queue. | |
3771 | 1141 inline void push(oop obj); |
342 | 1142 |
1143 // These two move entries to/from the global stack. | |
1144 void move_entries_to_global_stack(); | |
1145 void get_entries_from_global_stack(); | |
1146 | |
1147 // It pops and scans objects from the local queue. If partially is | |
1148 // true, then it stops when the queue size is of a given limit. If | |
1149 // partially is false, then it stops when the queue is empty. | |
1150 void drain_local_queue(bool partially); | |
1151 // It moves entries from the global stack to the local queue and | |
1152 // drains the local queue. If partially is true, then it stops when | |
1153 // both the global stack and the local queue reach a given size. If | |
1154 // partially if false, it tries to empty them totally. | |
1155 void drain_global_stack(bool partially); | |
1156 // It keeps picking SATB buffers and processing them until no SATB | |
1157 // buffers are available. | |
1158 void drain_satb_buffers(); | |
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1159 |
342 | 1160 // moves the local finger to a new location |
1161 inline void move_finger_to(HeapWord* new_finger) { | |
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1162 assert(new_finger >= _finger && new_finger < _region_limit, "invariant"); |
342 | 1163 _finger = new_finger; |
1164 } | |
1165 | |
1166 CMTask(int task_num, ConcurrentMark *cm, | |
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1167 size_t* marked_bytes, BitMap* card_bm, |
342 | 1168 CMTaskQueue* task_queue, CMTaskQueueSet* task_queues); |
1169 | |
1170 // it prints statistics associated with this task | |
1171 void print_stats(); | |
1172 | |
1173 #if _MARKING_STATS_ | |
1174 void increase_objs_found_on_bitmap() { ++_objs_found_on_bitmap; } | |
1175 #endif // _MARKING_STATS_ | |
1176 }; | |
1972 | 1177 |
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1178 // Class that's used to to print out per-region liveness |
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1179 // information. It's currently used at the end of marking and also |
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1180 // after we sort the old regions at the end of the cleanup operation. |
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1181 class G1PrintRegionLivenessInfoClosure: public HeapRegionClosure { |
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1182 private: |
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1183 outputStream* _out; |
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1184 |
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1185 // Accumulators for these values. |
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1186 size_t _total_used_bytes; |
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1187 size_t _total_capacity_bytes; |
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1188 size_t _total_prev_live_bytes; |
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1189 size_t _total_next_live_bytes; |
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1190 |
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1191 // These are set up when we come across a "stars humongous" region |
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1192 // (as this is where most of this information is stored, not in the |
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1193 // subsequent "continues humongous" regions). After that, for every |
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1194 // region in a given humongous region series we deduce the right |
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1195 // values for it by simply subtracting the appropriate amount from |
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1196 // these fields. All these values should reach 0 after we've visited |
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1197 // the last region in the series. |
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1198 size_t _hum_used_bytes; |
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1199 size_t _hum_capacity_bytes; |
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1200 size_t _hum_prev_live_bytes; |
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1201 size_t _hum_next_live_bytes; |
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1202 |
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1203 static double perc(size_t val, size_t total) { |
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1204 if (total == 0) { |
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1205 return 0.0; |
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1206 } else { |
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1207 return 100.0 * ((double) val / (double) total); |
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1208 } |
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1209 } |
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1210 |
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1211 static double bytes_to_mb(size_t val) { |
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1212 return (double) val / (double) M; |
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1213 } |
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1214 |
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1215 // See the .cpp file. |
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1216 size_t get_hum_bytes(size_t* hum_bytes); |
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1217 void get_hum_bytes(size_t* used_bytes, size_t* capacity_bytes, |
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1218 size_t* prev_live_bytes, size_t* next_live_bytes); |
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1219 |
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1220 public: |
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1221 // The header and footer are printed in the constructor and |
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1222 // destructor respectively. |
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1223 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name); |
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1224 virtual bool doHeapRegion(HeapRegion* r); |
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1225 ~G1PrintRegionLivenessInfoClosure(); |
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1226 }; |
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1227 |
1972 | 1228 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP |