Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.hpp @ 5935:a735aec54ea4
7123170: JCK vm/jvmti/ResourceExhausted/resexh001/resexh00101/ tests fails since 7u4 b02
Summary: The JVMTI ResourceExhausted events must be generated in all places where OOME is thrown
Reviewed-by: acorn, coleenp, dcubed, dholmes, dsamersoff, jwilhelm, tonyp
Contributed-by: serguei.spitsyn@oracle.com
author | sspitsyn |
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date | Wed, 14 Mar 2012 20:06:48 -0700 |
parents | eff609af17d7 |
children | 2a0172480595 |
rev | line source |
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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 | |
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87 inline bool iterate(BitMapClosure* cl, MemRegion mr); |
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88 inline bool iterate(BitMapClosure* cl); |
342 | 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 | |
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352 class YoungList; |
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353 |
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354 // Root Regions are regions that are not empty at the beginning of a |
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355 // marking cycle and which we might collect during an evacuation pause |
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356 // while the cycle is active. Given that, during evacuation pauses, we |
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357 // do not copy objects that are explicitly marked, what we have to do |
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358 // for the root regions is to scan them and mark all objects reachable |
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359 // from them. According to the SATB assumptions, we only need to visit |
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360 // each object once during marking. So, as long as we finish this scan |
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361 // before the next evacuation pause, we can copy the objects from the |
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362 // root regions without having to mark them or do anything else to them. |
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363 // |
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364 // Currently, we only support root region scanning once (at the start |
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365 // of the marking cycle) and the root regions are all the survivor |
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366 // regions populated during the initial-mark pause. |
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367 class CMRootRegions VALUE_OBJ_CLASS_SPEC { |
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368 private: |
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369 YoungList* _young_list; |
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370 ConcurrentMark* _cm; |
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371 |
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372 volatile bool _scan_in_progress; |
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373 volatile bool _should_abort; |
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374 HeapRegion* volatile _next_survivor; |
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375 |
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376 public: |
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377 CMRootRegions(); |
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378 // We actually do most of the initialization in this method. |
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379 void init(G1CollectedHeap* g1h, ConcurrentMark* cm); |
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380 |
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381 // Reset the claiming / scanning of the root regions. |
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382 void prepare_for_scan(); |
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383 |
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384 // Forces get_next() to return NULL so that the iteration aborts early. |
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385 void abort() { _should_abort = true; } |
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386 |
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387 // Return true if the CM thread are actively scanning root regions, |
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388 // false otherwise. |
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389 bool scan_in_progress() { return _scan_in_progress; } |
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390 |
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391 // Claim the next root region to scan atomically, or return NULL if |
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392 // all have been claimed. |
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393 HeapRegion* claim_next(); |
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394 |
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395 // Flag that we're done with root region scanning and notify anyone |
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396 // who's waiting on it. If aborted is false, assume that all regions |
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397 // have been claimed. |
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398 void scan_finished(); |
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399 |
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400 // If CM threads are still scanning root regions, wait until they |
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401 // are done. Return true if we had to wait, false otherwise. |
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402 bool wait_until_scan_finished(); |
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403 }; |
342 | 404 |
405 class ConcurrentMarkThread; | |
406 | |
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407 class ConcurrentMark : public CHeapObj { |
342 | 408 friend class ConcurrentMarkThread; |
409 friend class CMTask; | |
410 friend class CMBitMapClosure; | |
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411 friend class CSetMarkOopClosure; |
342 | 412 friend class CMGlobalObjectClosure; |
413 friend class CMRemarkTask; | |
414 friend class CMConcurrentMarkingTask; | |
415 friend class G1ParNoteEndTask; | |
416 friend class CalcLiveObjectsClosure; | |
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417 friend class G1CMRefProcTaskProxy; |
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418 friend class G1CMRefProcTaskExecutor; |
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419 friend class G1CMParKeepAliveAndDrainClosure; |
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420 friend class G1CMParDrainMarkingStackClosure; |
342 | 421 |
422 protected: | |
423 ConcurrentMarkThread* _cmThread; // the thread doing the work | |
424 G1CollectedHeap* _g1h; // the heap. | |
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425 uint _parallel_marking_threads; // the number of marking |
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426 // threads we're use |
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427 uint _max_parallel_marking_threads; // max number of marking |
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428 // threads we'll ever use |
342 | 429 double _sleep_factor; // how much we have to sleep, with |
430 // respect to the work we just did, to | |
431 // meet the marking overhead goal | |
432 double _marking_task_overhead; // marking target overhead for | |
433 // a single task | |
434 | |
435 // same as the two above, but for the cleanup task | |
436 double _cleanup_sleep_factor; | |
437 double _cleanup_task_overhead; | |
438 | |
2152 | 439 FreeRegionList _cleanup_list; |
342 | 440 |
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441 // Concurrent marking support structures |
342 | 442 CMBitMap _markBitMap1; |
443 CMBitMap _markBitMap2; | |
444 CMBitMapRO* _prevMarkBitMap; // completed mark bitmap | |
445 CMBitMap* _nextMarkBitMap; // under-construction mark bitmap | |
446 bool _at_least_one_mark_complete; | |
447 | |
448 BitMap _region_bm; | |
449 BitMap _card_bm; | |
450 | |
451 // Heap bounds | |
452 HeapWord* _heap_start; | |
453 HeapWord* _heap_end; | |
454 | |
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455 // Root region tracking and claiming. |
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456 CMRootRegions _root_regions; |
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457 |
342 | 458 // For gray objects |
459 CMMarkStack _markStack; // Grey objects behind global finger. | |
460 CMRegionStack _regionStack; // Grey regions behind global finger. | |
461 HeapWord* volatile _finger; // the global finger, region aligned, | |
462 // always points to the end of the | |
463 // last claimed region | |
464 | |
465 // marking tasks | |
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466 uint _max_task_num; // maximum task number |
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467 uint _active_tasks; // task num currently active |
342 | 468 CMTask** _tasks; // task queue array (max_task_num len) |
469 CMTaskQueueSet* _task_queues; // task queue set | |
470 ParallelTaskTerminator _terminator; // for termination | |
471 | |
472 // Two sync barriers that are used to synchronise tasks when an | |
473 // overflow occurs. The algorithm is the following. All tasks enter | |
474 // the first one to ensure that they have all stopped manipulating | |
475 // the global data structures. After they exit it, they re-initialise | |
476 // their data structures and task 0 re-initialises the global data | |
477 // structures. Then, they enter the second sync barrier. This | |
478 // ensure, that no task starts doing work before all data | |
479 // structures (local and global) have been re-initialised. When they | |
480 // exit it, they are free to start working again. | |
481 WorkGangBarrierSync _first_overflow_barrier_sync; | |
482 WorkGangBarrierSync _second_overflow_barrier_sync; | |
483 | |
484 // this is set by any task, when an overflow on the global data | |
485 // structures is detected. | |
486 volatile bool _has_overflown; | |
487 // true: marking is concurrent, false: we're in remark | |
488 volatile bool _concurrent; | |
489 // set at the end of a Full GC so that marking aborts | |
490 volatile bool _has_aborted; | |
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491 |
342 | 492 // used when remark aborts due to an overflow to indicate that |
493 // another concurrent marking phase should start | |
494 volatile bool _restart_for_overflow; | |
495 | |
496 // This is true from the very start of concurrent marking until the | |
497 // point when all the tasks complete their work. It is really used | |
498 // to determine the points between the end of concurrent marking and | |
499 // time of remark. | |
500 volatile bool _concurrent_marking_in_progress; | |
501 | |
502 // verbose level | |
503 CMVerboseLevel _verbose_level; | |
504 | |
505 // These two fields are used to implement the optimisation that | |
506 // avoids pushing objects on the global/region stack if there are | |
507 // no collection set regions above the lowest finger. | |
508 | |
509 // This is the lowest finger (among the global and local fingers), | |
510 // which is calculated before a new collection set is chosen. | |
511 HeapWord* _min_finger; | |
512 // If this flag is true, objects/regions that are marked below the | |
513 // finger should be pushed on the stack(s). If this is flag is | |
514 // false, it is safe not to push them on the stack(s). | |
515 bool _should_gray_objects; | |
516 | |
517 // All of these times are in ms. | |
518 NumberSeq _init_times; | |
519 NumberSeq _remark_times; | |
520 NumberSeq _remark_mark_times; | |
521 NumberSeq _remark_weak_ref_times; | |
522 NumberSeq _cleanup_times; | |
523 double _total_counting_time; | |
524 double _total_rs_scrub_time; | |
525 | |
526 double* _accum_task_vtime; // accumulated task vtime | |
527 | |
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528 FlexibleWorkGang* _parallel_workers; |
342 | 529 |
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530 ForceOverflowSettings _force_overflow_conc; |
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531 ForceOverflowSettings _force_overflow_stw; |
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532 |
342 | 533 void weakRefsWork(bool clear_all_soft_refs); |
534 | |
535 void swapMarkBitMaps(); | |
536 | |
537 // It resets the global marking data structures, as well as the | |
538 // task local ones; should be called during initial mark. | |
539 void reset(); | |
540 // It resets all the marking data structures. | |
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541 void clear_marking_state(bool clear_overflow = true); |
342 | 542 |
543 // It should be called to indicate which phase we're in (concurrent | |
544 // mark or remark) and how many threads are currently active. | |
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545 void set_phase(uint active_tasks, bool concurrent); |
342 | 546 // We do this after we're done with marking so that the marking data |
547 // structures are initialised to a sensible and predictable state. | |
548 void set_non_marking_state(); | |
549 | |
550 // prints all gathered CM-related statistics | |
551 void print_stats(); | |
552 | |
2152 | 553 bool cleanup_list_is_empty() { |
554 return _cleanup_list.is_empty(); | |
555 } | |
556 | |
342 | 557 // accessor methods |
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558 uint parallel_marking_threads() { return _parallel_marking_threads; } |
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559 uint max_parallel_marking_threads() { return _max_parallel_marking_threads;} |
342 | 560 double sleep_factor() { return _sleep_factor; } |
561 double marking_task_overhead() { return _marking_task_overhead;} | |
562 double cleanup_sleep_factor() { return _cleanup_sleep_factor; } | |
563 double cleanup_task_overhead() { return _cleanup_task_overhead;} | |
564 | |
565 HeapWord* finger() { return _finger; } | |
566 bool concurrent() { return _concurrent; } | |
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567 uint active_tasks() { return _active_tasks; } |
342 | 568 ParallelTaskTerminator* terminator() { return &_terminator; } |
569 | |
570 // It claims the next available region to be scanned by a marking | |
571 // task. It might return NULL if the next region is empty or we have | |
572 // run out of regions. In the latter case, out_of_regions() | |
573 // determines whether we've really run out of regions or the task | |
574 // should call claim_region() again. This might seem a bit | |
575 // awkward. Originally, the code was written so that claim_region() | |
576 // either successfully returned with a non-empty region or there | |
577 // were no more regions to be claimed. The problem with this was | |
578 // that, in certain circumstances, it iterated over large chunks of | |
579 // the heap finding only empty regions and, while it was working, it | |
580 // was preventing the calling task to call its regular clock | |
581 // method. So, this way, each task will spend very little time in | |
582 // claim_region() and is allowed to call the regular clock method | |
583 // frequently. | |
584 HeapRegion* claim_region(int task); | |
585 | |
586 // It determines whether we've run out of regions to scan. | |
587 bool out_of_regions() { return _finger == _heap_end; } | |
588 | |
589 // Returns the task with the given id | |
590 CMTask* task(int id) { | |
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591 assert(0 <= id && id < (int) _active_tasks, |
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592 "task id not within active bounds"); |
342 | 593 return _tasks[id]; |
594 } | |
595 | |
596 // Returns the task queue with the given id | |
597 CMTaskQueue* task_queue(int id) { | |
1023
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598 assert(0 <= id && id < (int) _active_tasks, |
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599 "task queue id not within active bounds"); |
342 | 600 return (CMTaskQueue*) _task_queues->queue(id); |
601 } | |
602 | |
603 // Returns the task queue set | |
604 CMTaskQueueSet* task_queues() { return _task_queues; } | |
605 | |
606 // Access / manipulation of the overflow flag which is set to | |
607 // indicate that the global stack or region stack has overflown | |
608 bool has_overflown() { return _has_overflown; } | |
609 void set_has_overflown() { _has_overflown = true; } | |
610 void clear_has_overflown() { _has_overflown = false; } | |
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611 bool restart_for_overflow() { return _restart_for_overflow; } |
342 | 612 |
613 bool has_aborted() { return _has_aborted; } | |
614 | |
615 // Methods to enter the two overflow sync barriers | |
616 void enter_first_sync_barrier(int task_num); | |
617 void enter_second_sync_barrier(int task_num); | |
618 | |
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619 ForceOverflowSettings* force_overflow_conc() { |
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620 return &_force_overflow_conc; |
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621 } |
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622 |
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623 ForceOverflowSettings* force_overflow_stw() { |
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624 return &_force_overflow_stw; |
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625 } |
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626 |
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627 ForceOverflowSettings* force_overflow() { |
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628 if (concurrent()) { |
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629 return force_overflow_conc(); |
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630 } else { |
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631 return force_overflow_stw(); |
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632 } |
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633 } |
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634 |
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635 // Live Data Counting data structures... |
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636 // These data structures are initialized at the start of |
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637 // marking. They are written to while marking is active. |
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638 // They are aggregated during remark; the aggregated values |
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639 // are then used to populate the _region_bm, _card_bm, and |
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640 // the total live bytes, which are then subsequently updated |
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641 // during cleanup. |
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642 |
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643 // An array of bitmaps (one bit map per task). Each bitmap |
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644 // is used to record the cards spanned by the live objects |
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645 // marked by that task/worker. |
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646 BitMap* _count_card_bitmaps; |
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647 |
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648 // Used to record the number of marked live bytes |
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649 // (for each region, by worker thread). |
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650 size_t** _count_marked_bytes; |
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651 |
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652 // Card index of the bottom of the G1 heap. Used for biasing indices into |
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653 // the card bitmaps. |
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654 intptr_t _heap_bottom_card_num; |
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655 |
342 | 656 public: |
657 // Manipulation of the global mark stack. | |
658 // Notice that the first mark_stack_push is CAS-based, whereas the | |
659 // two below are Mutex-based. This is OK since the first one is only | |
660 // called during evacuation pauses and doesn't compete with the | |
661 // other two (which are called by the marking tasks during | |
662 // concurrent marking or remark). | |
663 bool mark_stack_push(oop p) { | |
664 _markStack.par_push(p); | |
665 if (_markStack.overflow()) { | |
666 set_has_overflown(); | |
667 return false; | |
668 } | |
669 return true; | |
670 } | |
671 bool mark_stack_push(oop* arr, int n) { | |
672 _markStack.par_push_arr(arr, n); | |
673 if (_markStack.overflow()) { | |
674 set_has_overflown(); | |
675 return false; | |
676 } | |
677 return true; | |
678 } | |
679 void mark_stack_pop(oop* arr, int max, int* n) { | |
680 _markStack.par_pop_arr(arr, max, n); | |
681 } | |
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682 size_t mark_stack_size() { return _markStack.size(); } |
342 | 683 size_t partial_mark_stack_size_target() { return _markStack.maxElems()/3; } |
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684 bool mark_stack_overflow() { return _markStack.overflow(); } |
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685 bool mark_stack_empty() { return _markStack.isEmpty(); } |
342 | 686 |
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687 // (Lock-free) Manipulation of the region stack |
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688 bool region_stack_push_lock_free(MemRegion mr) { |
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689 // Currently we only call the lock-free version during evacuation |
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690 // pauses. |
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691 assert(SafepointSynchronize::is_at_safepoint(), "world should be stopped"); |
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692 |
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693 _regionStack.push_lock_free(mr); |
342 | 694 if (_regionStack.overflow()) { |
695 set_has_overflown(); | |
696 return false; | |
697 } | |
698 return true; | |
699 } | |
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700 |
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701 // Lock-free version of region-stack pop. Should only be |
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702 // called in tandem with other lock-free pops. |
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703 MemRegion region_stack_pop_lock_free() { |
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704 return _regionStack.pop_lock_free(); |
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705 } |
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706 |
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707 #if 0 |
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708 // The routines that manipulate the region stack with a lock are |
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709 // not currently used. They should be retained, however, as a |
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710 // diagnostic aid. |
1358
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711 |
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712 bool region_stack_push_with_lock(MemRegion mr) { |
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713 // Currently we only call the lock-based version during either |
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714 // concurrent marking or remark. |
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715 assert(!SafepointSynchronize::is_at_safepoint() || !concurrent(), |
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716 "if we are at a safepoint it should be the remark safepoint"); |
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717 |
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718 _regionStack.push_with_lock(mr); |
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719 if (_regionStack.overflow()) { |
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720 set_has_overflown(); |
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721 return false; |
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722 } |
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723 return true; |
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724 } |
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725 |
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726 MemRegion region_stack_pop_with_lock() { |
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727 // Currently we only call the lock-based version during either |
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728 // concurrent marking or remark. |
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729 assert(!SafepointSynchronize::is_at_safepoint() || !concurrent(), |
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730 "if we are at a safepoint it should be the remark safepoint"); |
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731 |
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732 return _regionStack.pop_with_lock(); |
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733 } |
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734 #endif |
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735 |
342 | 736 int region_stack_size() { return _regionStack.size(); } |
737 bool region_stack_overflow() { return _regionStack.overflow(); } | |
738 bool region_stack_empty() { return _regionStack.isEmpty(); } | |
739 | |
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740 // Iterate over any regions that were aborted while draining the |
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741 // region stack (any such regions are saved in the corresponding |
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742 // CMTask) and invalidate (i.e. assign to the empty MemRegion()) |
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743 // any regions that point into the collection set. |
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744 bool invalidate_aborted_regions_in_cset(); |
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745 |
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746 // Returns true if there are any aborted memory regions. |
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747 bool has_aborted_regions(); |
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748 |
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749 CMRootRegions* root_regions() { return &_root_regions; } |
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750 |
342 | 751 bool concurrent_marking_in_progress() { |
752 return _concurrent_marking_in_progress; | |
753 } | |
754 void set_concurrent_marking_in_progress() { | |
755 _concurrent_marking_in_progress = true; | |
756 } | |
757 void clear_concurrent_marking_in_progress() { | |
758 _concurrent_marking_in_progress = false; | |
759 } | |
760 | |
761 void update_accum_task_vtime(int i, double vtime) { | |
762 _accum_task_vtime[i] += vtime; | |
763 } | |
764 | |
765 double all_task_accum_vtime() { | |
766 double ret = 0.0; | |
767 for (int i = 0; i < (int)_max_task_num; ++i) | |
768 ret += _accum_task_vtime[i]; | |
769 return ret; | |
770 } | |
771 | |
772 // Attempts to steal an object from the task queues of other tasks | |
773 bool try_stealing(int task_num, int* hash_seed, oop& obj) { | |
774 return _task_queues->steal(task_num, hash_seed, obj); | |
775 } | |
776 | |
777 // It grays an object by first marking it. Then, if it's behind the | |
778 // global finger, it also pushes it on the global stack. | |
779 void deal_with_reference(oop obj); | |
780 | |
781 ConcurrentMark(ReservedSpace rs, int max_regions); | |
782 ~ConcurrentMark(); | |
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783 |
342 | 784 ConcurrentMarkThread* cmThread() { return _cmThread; } |
785 | |
786 CMBitMapRO* prevMarkBitMap() const { return _prevMarkBitMap; } | |
787 CMBitMap* nextMarkBitMap() const { return _nextMarkBitMap; } | |
788 | |
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789 // Returns the number of GC threads to be used in a concurrent |
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790 // phase based on the number of GC threads being used in a STW |
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791 // phase. |
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792 uint scale_parallel_threads(uint n_par_threads); |
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793 |
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794 // Calculates the number of GC threads to be used in a concurrent phase. |
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795 uint calc_parallel_marking_threads(); |
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796 |
342 | 797 // The following three are interaction between CM and |
798 // G1CollectedHeap | |
799 | |
800 // This notifies CM that a root during initial-mark needs to be | |
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801 // grayed. It is MT-safe. word_size is the size of the object in |
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802 // words. It is passed explicitly as sometimes we cannot calculate |
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803 // it from the given object because it might be in an inconsistent |
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804 // state (e.g., in to-space and being copied). So the caller is |
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805 // responsible for dealing with this issue (e.g., get the size from |
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806 // the from-space image when the to-space image might be |
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807 // inconsistent) and always passing the size. hr is the region that |
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808 // contains the object and it's passed optionally from callers who |
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809 // might already have it (no point in recalculating it). |
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810 inline void grayRoot(oop obj, size_t word_size, |
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811 uint worker_id, HeapRegion* hr = NULL); |
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812 |
342 | 813 // It's used during evacuation pauses to gray a region, if |
814 // necessary, and it's MT-safe. It assumes that the caller has | |
815 // marked any objects on that region. If _should_gray_objects is | |
816 // true and we're still doing concurrent marking, the region is | |
817 // pushed on the region stack, if it is located below the global | |
818 // finger, otherwise we do nothing. | |
819 void grayRegionIfNecessary(MemRegion mr); | |
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820 |
342 | 821 // It's used during evacuation pauses to mark and, if necessary, |
822 // gray a single object and it's MT-safe. It assumes the caller did | |
823 // not mark the object. If _should_gray_objects is true and we're | |
824 // still doing concurrent marking, the objects is pushed on the | |
825 // global stack, if it is located below the global finger, otherwise | |
826 // we do nothing. | |
827 void markAndGrayObjectIfNecessary(oop p); | |
828 | |
1388 | 829 // It iterates over the heap and for each object it comes across it |
830 // will dump the contents of its reference fields, as well as | |
831 // liveness information for the object and its referents. The dump | |
832 // will be written to a file with the following name: | |
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833 // G1PrintReachableBaseFile + "." + str. |
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834 // vo decides whether the prev (vo == UsePrevMarking), the next |
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835 // (vo == UseNextMarking) marking information, or the mark word |
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836 // (vo == UseMarkWord) will be used to determine the liveness of |
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837 // each object / referent. |
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838 // If all is true, all objects in the heap will be dumped, otherwise |
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839 // only the live ones. In the dump the following symbols / breviations |
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840 // are used: |
1388 | 841 // M : an explicitly live object (its bitmap bit is set) |
842 // > : an implicitly live object (over tams) | |
843 // O : an object outside the G1 heap (typically: in the perm gen) | |
844 // NOT : a reference field whose referent is not live | |
845 // AND MARKED : indicates that an object is both explicitly and | |
846 // implicitly live (it should be one or the other, not both) | |
847 void print_reachable(const char* str, | |
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848 VerifyOption vo, bool all) PRODUCT_RETURN; |
342 | 849 |
850 // Clear the next marking bitmap (will be called concurrently). | |
851 void clearNextBitmap(); | |
852 | |
853 // These two do the work that needs to be done before and after the | |
854 // initial root checkpoint. Since this checkpoint can be done at two | |
855 // different points (i.e. an explicit pause or piggy-backed on a | |
856 // young collection), then it's nice to be able to easily share the | |
857 // pre/post code. It might be the case that we can put everything in | |
858 // the post method. TP | |
859 void checkpointRootsInitialPre(); | |
860 void checkpointRootsInitialPost(); | |
861 | |
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862 // Scan all the root regions and mark everything reachable from |
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863 // them. |
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864 void scanRootRegions(); |
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865 |
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866 // Scan a single root region and mark everything reachable from it. |
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867 void scanRootRegion(HeapRegion* hr, uint worker_id); |
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868 |
342 | 869 // Do concurrent phase of marking, to a tentative transitive closure. |
870 void markFromRoots(); | |
871 | |
872 // Process all unprocessed SATB buffers. It is called at the | |
873 // beginning of an evacuation pause. | |
874 void drainAllSATBBuffers(); | |
875 | |
876 void checkpointRootsFinal(bool clear_all_soft_refs); | |
877 void checkpointRootsFinalWork(); | |
878 void cleanup(); | |
879 void completeCleanup(); | |
880 | |
881 // Mark in the previous bitmap. NB: this is usually read-only, so use | |
882 // this carefully! | |
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883 inline void markPrev(oop p); |
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884 |
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885 // Clears marks for all objects in the given range, for the prev, |
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886 // next, or both bitmaps. NB: the previous bitmap is usually |
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887 // read-only, so use this carefully! |
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888 void clearRangePrevBitmap(MemRegion mr); |
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889 void clearRangeNextBitmap(MemRegion mr); |
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890 void clearRangeBothBitmaps(MemRegion mr); |
342 | 891 |
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892 // Notify data structures that a GC has started. |
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893 void note_start_of_gc() { |
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894 _markStack.note_start_of_gc(); |
342 | 895 } |
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896 |
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897 // Notify data structures that a GC is finished. |
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898 void note_end_of_gc() { |
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899 _markStack.note_end_of_gc(); |
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900 } |
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901 |
342 | 902 // Iterate over the oops in the mark stack and all local queues. It |
903 // also calls invalidate_entries_into_cset() on the region stack. | |
904 void oops_do(OopClosure* f); | |
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905 |
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906 // Verify that there are no CSet oops on the stacks (taskqueues / |
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907 // global mark stack), enqueued SATB buffers, per-thread SATB |
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908 // buffers, and fingers (global / per-task). The boolean parameters |
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909 // decide which of the above data structures to verify. If marking |
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910 // is not in progress, it's a no-op. |
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911 void verify_no_cset_oops(bool verify_stacks, |
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912 bool verify_enqueued_buffers, |
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913 bool verify_thread_buffers, |
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914 bool verify_fingers) PRODUCT_RETURN; |
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915 |
342 | 916 // It is called at the end of an evacuation pause during marking so |
917 // that CM is notified of where the new end of the heap is. It | |
918 // doesn't do anything if concurrent_marking_in_progress() is false, | |
919 // unless the force parameter is true. | |
920 void update_g1_committed(bool force = false); | |
921 | |
922 void complete_marking_in_collection_set(); | |
923 | |
924 // It indicates that a new collection set is being chosen. | |
925 void newCSet(); | |
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926 |
342 | 927 // It registers a collection set heap region with CM. This is used |
928 // to determine whether any heap regions are located above the finger. | |
929 void registerCSetRegion(HeapRegion* hr); | |
930 | |
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931 // Resets the region fields of any active CMTask whose region fields |
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932 // are in the collection set (i.e. the region currently claimed by |
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933 // the CMTask will be evacuated and may be used, subsequently, as |
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934 // an alloc region). When this happens the region fields in the CMTask |
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935 // are stale and, hence, should be cleared causing the worker thread |
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936 // to claim a new region. |
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937 void reset_active_task_region_fields_in_cset(); |
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938 |
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939 // Registers the maximum region-end associated with a set of |
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940 // regions with CM. Again this is used to determine whether any |
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941 // heap regions are located above the finger. |
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942 void register_collection_set_finger(HeapWord* max_finger) { |
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943 // max_finger is the highest heap region end of the regions currently |
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944 // contained in the collection set. If this value is larger than |
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945 // _min_finger then we need to gray objects. |
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946 // This routine is like registerCSetRegion but for an entire |
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947 // collection of regions. |
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948 if (max_finger > _min_finger) { |
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949 _should_gray_objects = true; |
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950 } |
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951 } |
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952 |
342 | 953 // Returns "true" if at least one mark has been completed. |
954 bool at_least_one_mark_complete() { return _at_least_one_mark_complete; } | |
955 | |
956 bool isMarked(oop p) const { | |
957 assert(p != NULL && p->is_oop(), "expected an oop"); | |
958 HeapWord* addr = (HeapWord*)p; | |
959 assert(addr >= _nextMarkBitMap->startWord() || | |
960 addr < _nextMarkBitMap->endWord(), "in a region"); | |
961 | |
962 return _nextMarkBitMap->isMarked(addr); | |
963 } | |
964 | |
965 inline bool not_yet_marked(oop p) const; | |
966 | |
967 // XXX Debug code | |
968 bool containing_card_is_marked(void* p); | |
969 bool containing_cards_are_marked(void* start, void* last); | |
970 | |
971 bool isPrevMarked(oop p) const { | |
972 assert(p != NULL && p->is_oop(), "expected an oop"); | |
973 HeapWord* addr = (HeapWord*)p; | |
974 assert(addr >= _prevMarkBitMap->startWord() || | |
975 addr < _prevMarkBitMap->endWord(), "in a region"); | |
976 | |
977 return _prevMarkBitMap->isMarked(addr); | |
978 } | |
979 | |
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980 inline bool do_yield_check(uint worker_i = 0); |
342 | 981 inline bool should_yield(); |
982 | |
983 // Called to abort the marking cycle after a Full GC takes palce. | |
984 void abort(); | |
985 | |
986 // This prints the global/local fingers. It is used for debugging. | |
987 NOT_PRODUCT(void print_finger();) | |
988 | |
989 void print_summary_info(); | |
990 | |
1019 | 991 void print_worker_threads_on(outputStream* st) const; |
992 | |
342 | 993 // The following indicate whether a given verbose level has been |
994 // set. Notice that anything above stats is conditional to | |
995 // _MARKING_VERBOSE_ having been set to 1 | |
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996 bool verbose_stats() { |
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997 return _verbose_level >= stats_verbose; |
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998 } |
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999 bool verbose_low() { |
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1000 return _MARKING_VERBOSE_ && _verbose_level >= low_verbose; |
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1001 } |
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1002 bool verbose_medium() { |
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1003 return _MARKING_VERBOSE_ && _verbose_level >= medium_verbose; |
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1004 } |
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1005 bool verbose_high() { |
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1006 return _MARKING_VERBOSE_ && _verbose_level >= high_verbose; |
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1007 } |
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1008 |
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1009 // Counting data structure accessors |
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1010 |
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1011 // Returns the card number of the bottom of the G1 heap. |
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1012 // Used in biasing indices into accounting card bitmaps. |
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1013 intptr_t heap_bottom_card_num() const { |
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1014 return _heap_bottom_card_num; |
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1015 } |
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1016 |
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1017 // Returns the card bitmap for a given task or worker id. |
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1018 BitMap* count_card_bitmap_for(uint worker_id) { |
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1019 assert(0 <= worker_id && worker_id < _max_task_num, "oob"); |
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1020 assert(_count_card_bitmaps != NULL, "uninitialized"); |
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1021 BitMap* task_card_bm = &_count_card_bitmaps[worker_id]; |
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1022 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
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1023 return task_card_bm; |
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1024 } |
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1025 |
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1026 // Returns the array containing the marked bytes for each region, |
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1027 // for the given worker or task id. |
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1028 size_t* count_marked_bytes_array_for(uint worker_id) { |
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1029 assert(0 <= worker_id && worker_id < _max_task_num, "oob"); |
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1030 assert(_count_marked_bytes != NULL, "uninitialized"); |
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1031 size_t* marked_bytes_array = _count_marked_bytes[worker_id]; |
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1032 assert(marked_bytes_array != NULL, "uninitialized"); |
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1033 return marked_bytes_array; |
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1034 } |
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1035 |
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1036 // Returns the index in the liveness accounting card table bitmap |
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1037 // for the given address |
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1038 inline BitMap::idx_t card_bitmap_index_for(HeapWord* addr); |
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1039 |
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1040 // Counts the size of the given memory region in the the given |
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1041 // marked_bytes array slot for the given HeapRegion. |
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1042 // Sets the bits in the given card bitmap that are associated with the |
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1043 // cards that are spanned by the memory region. |
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1044 inline void count_region(MemRegion mr, HeapRegion* hr, |
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1045 size_t* marked_bytes_array, |
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1046 BitMap* task_card_bm); |
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1047 |
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1048 // Counts the given memory region in the task/worker counting |
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1049 // data structures for the given worker id. |
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1050 inline void count_region(MemRegion mr, HeapRegion* hr, uint worker_id); |
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1051 |
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1052 // Counts the given memory region in the task/worker counting |
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1053 // data structures for the given worker id. |
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1054 inline void count_region(MemRegion mr, uint worker_id); |
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1055 |
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1056 // Counts the given object in the given task/worker counting |
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1057 // data structures. |
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1058 inline void count_object(oop obj, HeapRegion* hr, |
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1059 size_t* marked_bytes_array, |
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1060 BitMap* task_card_bm); |
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1061 |
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1062 // Counts the given object in the task/worker counting data |
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1063 // structures for the given worker id. |
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1064 inline void count_object(oop obj, HeapRegion* hr, uint worker_id); |
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1065 |
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1066 // Attempts to mark the given object and, if successful, counts |
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1067 // the object in the given task/worker counting structures. |
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1068 inline bool par_mark_and_count(oop obj, HeapRegion* hr, |
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1069 size_t* marked_bytes_array, |
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1070 BitMap* task_card_bm); |
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1071 |
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1072 // Attempts to mark the given object and, if successful, counts |
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1073 // the object in the task/worker counting structures for the |
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1074 // given worker id. |
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1075 inline bool par_mark_and_count(oop obj, size_t word_size, |
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1076 HeapRegion* hr, uint worker_id); |
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1077 |
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1078 // Attempts to mark the given object and, if successful, counts |
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1079 // the object in the task/worker counting structures for the |
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1080 // given worker id. |
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1081 inline bool par_mark_and_count(oop obj, HeapRegion* hr, uint worker_id); |
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1082 |
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1083 // Similar to the above routine but we don't know the heap region that |
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1084 // contains the object to be marked/counted, which this routine looks up. |
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1085 inline bool par_mark_and_count(oop obj, uint worker_id); |
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1086 |
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1087 // Similar to the above routine but there are times when we cannot |
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1088 // safely calculate the size of obj due to races and we, therefore, |
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1089 // pass the size in as a parameter. It is the caller's reponsibility |
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1090 // to ensure that the size passed in for obj is valid. |
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1091 inline bool par_mark_and_count(oop obj, size_t word_size, uint worker_id); |
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1092 |
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1093 // Unconditionally mark the given object, and unconditinally count |
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1094 // the object in the counting structures for worker id 0. |
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1095 // Should *not* be called from parallel code. |
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1096 inline bool mark_and_count(oop obj, HeapRegion* hr); |
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1097 |
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1098 // Similar to the above routine but we don't know the heap region that |
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1099 // contains the object to be marked/counted, which this routine looks up. |
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1100 // Should *not* be called from parallel code. |
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1101 inline bool mark_and_count(oop obj); |
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1102 |
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1103 protected: |
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1104 // Clear all the per-task bitmaps and arrays used to store the |
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1105 // counting data. |
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1106 void clear_all_count_data(); |
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1107 |
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1108 // Aggregates the counting data for each worker/task |
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1109 // that was constructed while marking. Also sets |
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1110 // the amount of marked bytes for each region and |
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1111 // the top at concurrent mark count. |
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1112 void aggregate_count_data(); |
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1113 |
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1114 // Verification routine |
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1115 void verify_count_data(); |
342 | 1116 }; |
1117 | |
1118 // A class representing a marking task. | |
1119 class CMTask : public TerminatorTerminator { | |
1120 private: | |
1121 enum PrivateConstants { | |
1122 // the regular clock call is called once the scanned words reaches | |
1123 // this limit | |
1124 words_scanned_period = 12*1024, | |
1125 // the regular clock call is called once the number of visited | |
1126 // references reaches this limit | |
1127 refs_reached_period = 384, | |
1128 // initial value for the hash seed, used in the work stealing code | |
1129 init_hash_seed = 17, | |
1130 // how many entries will be transferred between global stack and | |
1131 // local queues | |
1132 global_stack_transfer_size = 16 | |
1133 }; | |
1134 | |
1135 int _task_id; | |
1136 G1CollectedHeap* _g1h; | |
1137 ConcurrentMark* _cm; | |
1138 CMBitMap* _nextMarkBitMap; | |
1139 // the task queue of this task | |
1140 CMTaskQueue* _task_queue; | |
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1141 private: |
342 | 1142 // the task queue set---needed for stealing |
1143 CMTaskQueueSet* _task_queues; | |
1144 // indicates whether the task has been claimed---this is only for | |
1145 // debugging purposes | |
1146 bool _claimed; | |
1147 | |
1148 // number of calls to this task | |
1149 int _calls; | |
1150 | |
1151 // when the virtual timer reaches this time, the marking step should | |
1152 // exit | |
1153 double _time_target_ms; | |
1154 // the start time of the current marking step | |
1155 double _start_time_ms; | |
1156 | |
1157 // the oop closure used for iterations over oops | |
3771 | 1158 G1CMOopClosure* _cm_oop_closure; |
342 | 1159 |
1160 // the region this task is scanning, NULL if we're not scanning any | |
1161 HeapRegion* _curr_region; | |
1162 // the local finger of this task, NULL if we're not scanning a region | |
1163 HeapWord* _finger; | |
1164 // limit of the region this task is scanning, NULL if we're not scanning one | |
1165 HeapWord* _region_limit; | |
1166 | |
1167 // This is used only when we scan regions popped from the region | |
1168 // stack. It records what the last object on such a region we | |
1169 // scanned was. It is used to ensure that, if we abort region | |
1170 // iteration, we do not rescan the first part of the region. This | |
1171 // should be NULL when we're not scanning a region from the region | |
1172 // stack. | |
1173 HeapWord* _region_finger; | |
1174 | |
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1175 // If we abort while scanning a region we record the remaining |
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1176 // unscanned portion and check this field when marking restarts. |
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1177 // This avoids having to push on the region stack while other |
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1178 // marking threads may still be popping regions. |
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1179 // If we were to push the unscanned portion directly to the |
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1180 // region stack then we would need to using locking versions |
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1181 // of the push and pop operations. |
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1182 MemRegion _aborted_region; |
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1183 |
342 | 1184 // the number of words this task has scanned |
1185 size_t _words_scanned; | |
1186 // When _words_scanned reaches this limit, the regular clock is | |
1187 // called. Notice that this might be decreased under certain | |
1188 // circumstances (i.e. when we believe that we did an expensive | |
1189 // operation). | |
1190 size_t _words_scanned_limit; | |
1191 // the initial value of _words_scanned_limit (i.e. what it was | |
1192 // before it was decreased). | |
1193 size_t _real_words_scanned_limit; | |
1194 | |
1195 // the number of references this task has visited | |
1196 size_t _refs_reached; | |
1197 // When _refs_reached reaches this limit, the regular clock is | |
1198 // called. Notice this this might be decreased under certain | |
1199 // circumstances (i.e. when we believe that we did an expensive | |
1200 // operation). | |
1201 size_t _refs_reached_limit; | |
1202 // the initial value of _refs_reached_limit (i.e. what it was before | |
1203 // it was decreased). | |
1204 size_t _real_refs_reached_limit; | |
1205 | |
1206 // used by the work stealing stuff | |
1207 int _hash_seed; | |
1208 // if this is true, then the task has aborted for some reason | |
1209 bool _has_aborted; | |
1210 // set when the task aborts because it has met its time quota | |
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1211 bool _has_timed_out; |
342 | 1212 // true when we're draining SATB buffers; this avoids the task |
1213 // aborting due to SATB buffers being available (as we're already | |
1214 // dealing with them) | |
1215 bool _draining_satb_buffers; | |
1216 | |
1217 // number sequence of past step times | |
1218 NumberSeq _step_times_ms; | |
1219 // elapsed time of this task | |
1220 double _elapsed_time_ms; | |
1221 // termination time of this task | |
1222 double _termination_time_ms; | |
1223 // when this task got into the termination protocol | |
1224 double _termination_start_time_ms; | |
1225 | |
1226 // true when the task is during a concurrent phase, false when it is | |
1227 // in the remark phase (so, in the latter case, we do not have to | |
1228 // check all the things that we have to check during the concurrent | |
1229 // phase, i.e. SATB buffer availability...) | |
1230 bool _concurrent; | |
1231 | |
1232 TruncatedSeq _marking_step_diffs_ms; | |
1233 | |
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1234 // Counting data structures. Embedding the task's marked_bytes_array |
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1235 // and card bitmap into the actual task saves having to go through |
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1236 // the ConcurrentMark object. |
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1237 size_t* _marked_bytes_array; |
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1238 BitMap* _card_bm; |
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1239 |
342 | 1240 // LOTS of statistics related with this task |
1241 #if _MARKING_STATS_ | |
1242 NumberSeq _all_clock_intervals_ms; | |
1243 double _interval_start_time_ms; | |
1244 | |
1245 int _aborted; | |
1246 int _aborted_overflow; | |
1247 int _aborted_cm_aborted; | |
1248 int _aborted_yield; | |
1249 int _aborted_timed_out; | |
1250 int _aborted_satb; | |
1251 int _aborted_termination; | |
1252 | |
1253 int _steal_attempts; | |
1254 int _steals; | |
1255 | |
1256 int _clock_due_to_marking; | |
1257 int _clock_due_to_scanning; | |
1258 | |
1259 int _local_pushes; | |
1260 int _local_pops; | |
1261 int _local_max_size; | |
1262 int _objs_scanned; | |
1263 | |
1264 int _global_pushes; | |
1265 int _global_pops; | |
1266 int _global_max_size; | |
1267 | |
1268 int _global_transfers_to; | |
1269 int _global_transfers_from; | |
1270 | |
1271 int _region_stack_pops; | |
1272 | |
1273 int _regions_claimed; | |
1274 int _objs_found_on_bitmap; | |
1275 | |
1276 int _satb_buffers_processed; | |
1277 #endif // _MARKING_STATS_ | |
1278 | |
1279 // it updates the local fields after this task has claimed | |
1280 // a new region to scan | |
1281 void setup_for_region(HeapRegion* hr); | |
1282 // it brings up-to-date the limit of the region | |
1283 void update_region_limit(); | |
1284 | |
1285 // called when either the words scanned or the refs visited limit | |
1286 // has been reached | |
1287 void reached_limit(); | |
1288 // recalculates the words scanned and refs visited limits | |
1289 void recalculate_limits(); | |
1290 // decreases the words scanned and refs visited limits when we reach | |
1291 // an expensive operation | |
1292 void decrease_limits(); | |
1293 // it checks whether the words scanned or refs visited reached their | |
1294 // respective limit and calls reached_limit() if they have | |
1295 void check_limits() { | |
1296 if (_words_scanned >= _words_scanned_limit || | |
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1297 _refs_reached >= _refs_reached_limit) { |
342 | 1298 reached_limit(); |
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1299 } |
342 | 1300 } |
1301 // this is supposed to be called regularly during a marking step as | |
1302 // it checks a bunch of conditions that might cause the marking step | |
1303 // to abort | |
1304 void regular_clock_call(); | |
1305 bool concurrent() { return _concurrent; } | |
1306 | |
1307 public: | |
1308 // It resets the task; it should be called right at the beginning of | |
1309 // a marking phase. | |
1310 void reset(CMBitMap* _nextMarkBitMap); | |
1311 // it clears all the fields that correspond to a claimed region. | |
1312 void clear_region_fields(); | |
1313 | |
1314 void set_concurrent(bool concurrent) { _concurrent = concurrent; } | |
1315 | |
1316 // The main method of this class which performs a marking step | |
1317 // trying not to exceed the given duration. However, it might exit | |
1318 // prematurely, according to some conditions (i.e. SATB buffers are | |
1319 // available for processing). | |
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1320 void do_marking_step(double target_ms, bool do_stealing, bool do_termination); |
342 | 1321 |
1322 // These two calls start and stop the timer | |
1323 void record_start_time() { | |
1324 _elapsed_time_ms = os::elapsedTime() * 1000.0; | |
1325 } | |
1326 void record_end_time() { | |
1327 _elapsed_time_ms = os::elapsedTime() * 1000.0 - _elapsed_time_ms; | |
1328 } | |
1329 | |
1330 // returns the task ID | |
1331 int task_id() { return _task_id; } | |
1332 | |
1333 // From TerminatorTerminator. It determines whether this task should | |
1334 // exit the termination protocol after it's entered it. | |
1335 virtual bool should_exit_termination(); | |
1336 | |
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1337 // Resets the local region fields after a task has finished scanning a |
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1338 // region; or when they have become stale as a result of the region |
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1339 // being evacuated. |
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1340 void giveup_current_region(); |
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1341 |
342 | 1342 HeapWord* finger() { return _finger; } |
1343 | |
1344 bool has_aborted() { return _has_aborted; } | |
1345 void set_has_aborted() { _has_aborted = true; } | |
1346 void clear_has_aborted() { _has_aborted = false; } | |
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1347 bool has_timed_out() { return _has_timed_out; } |
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1348 bool claimed() { return _claimed; } |
342 | 1349 |
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1350 // Support routines for the partially scanned region that may be |
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1351 // recorded as a result of aborting while draining the CMRegionStack |
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1352 MemRegion aborted_region() { return _aborted_region; } |
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1353 void set_aborted_region(MemRegion mr) |
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1354 { _aborted_region = mr; } |
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1355 |
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1356 // Clears any recorded partially scanned region |
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1357 void clear_aborted_region() { set_aborted_region(MemRegion()); } |
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1358 |
3771 | 1359 void set_cm_oop_closure(G1CMOopClosure* cm_oop_closure); |
342 | 1360 |
1361 // It grays the object by marking it and, if necessary, pushing it | |
1362 // on the local queue | |
3771 | 1363 inline void deal_with_reference(oop obj); |
342 | 1364 |
1365 // It scans an object and visits its children. | |
3771 | 1366 void scan_object(oop obj); |
342 | 1367 |
1368 // It pushes an object on the local queue. | |
3771 | 1369 inline void push(oop obj); |
342 | 1370 |
1371 // These two move entries to/from the global stack. | |
1372 void move_entries_to_global_stack(); | |
1373 void get_entries_from_global_stack(); | |
1374 | |
1375 // It pops and scans objects from the local queue. If partially is | |
1376 // true, then it stops when the queue size is of a given limit. If | |
1377 // partially is false, then it stops when the queue is empty. | |
1378 void drain_local_queue(bool partially); | |
1379 // It moves entries from the global stack to the local queue and | |
1380 // drains the local queue. If partially is true, then it stops when | |
1381 // both the global stack and the local queue reach a given size. If | |
1382 // partially if false, it tries to empty them totally. | |
1383 void drain_global_stack(bool partially); | |
1384 // It keeps picking SATB buffers and processing them until no SATB | |
1385 // buffers are available. | |
1386 void drain_satb_buffers(); | |
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1387 |
342 | 1388 // It keeps popping regions from the region stack and processing |
1389 // them until the region stack is empty. | |
1390 void drain_region_stack(BitMapClosure* closure); | |
1391 | |
1392 // moves the local finger to a new location | |
1393 inline void move_finger_to(HeapWord* new_finger) { | |
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1394 assert(new_finger >= _finger && new_finger < _region_limit, "invariant"); |
342 | 1395 _finger = new_finger; |
1396 } | |
1397 | |
1398 // moves the region finger to a new location | |
1399 inline void move_region_finger_to(HeapWord* new_finger) { | |
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1400 assert(new_finger < _cm->finger(), "invariant"); |
342 | 1401 _region_finger = new_finger; |
1402 } | |
1403 | |
1404 CMTask(int task_num, ConcurrentMark *cm, | |
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1405 size_t* marked_bytes, BitMap* card_bm, |
342 | 1406 CMTaskQueue* task_queue, CMTaskQueueSet* task_queues); |
1407 | |
1408 // it prints statistics associated with this task | |
1409 void print_stats(); | |
1410 | |
1411 #if _MARKING_STATS_ | |
1412 void increase_objs_found_on_bitmap() { ++_objs_found_on_bitmap; } | |
1413 #endif // _MARKING_STATS_ | |
1414 }; | |
1972 | 1415 |
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1416 // Class that's used to to print out per-region liveness |
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1417 // information. It's currently used at the end of marking and also |
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1418 // after we sort the old regions at the end of the cleanup operation. |
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1419 class G1PrintRegionLivenessInfoClosure: public HeapRegionClosure { |
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1420 private: |
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1421 outputStream* _out; |
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1422 |
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1423 // Accumulators for these values. |
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1424 size_t _total_used_bytes; |
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1425 size_t _total_capacity_bytes; |
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1426 size_t _total_prev_live_bytes; |
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1427 size_t _total_next_live_bytes; |
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1428 |
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1429 // These are set up when we come across a "stars humongous" region |
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1430 // (as this is where most of this information is stored, not in the |
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1431 // subsequent "continues humongous" regions). After that, for every |
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1432 // region in a given humongous region series we deduce the right |
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1433 // values for it by simply subtracting the appropriate amount from |
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1434 // these fields. All these values should reach 0 after we've visited |
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1435 // the last region in the series. |
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1436 size_t _hum_used_bytes; |
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1437 size_t _hum_capacity_bytes; |
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1438 size_t _hum_prev_live_bytes; |
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1439 size_t _hum_next_live_bytes; |
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1440 |
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1441 static double perc(size_t val, size_t total) { |
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1442 if (total == 0) { |
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1443 return 0.0; |
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1444 } else { |
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1445 return 100.0 * ((double) val / (double) total); |
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1446 } |
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1447 } |
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1448 |
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1449 static double bytes_to_mb(size_t val) { |
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1450 return (double) val / (double) M; |
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1451 } |
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1452 |
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1453 // See the .cpp file. |
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1454 size_t get_hum_bytes(size_t* hum_bytes); |
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1455 void get_hum_bytes(size_t* used_bytes, size_t* capacity_bytes, |
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1456 size_t* prev_live_bytes, size_t* next_live_bytes); |
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1457 |
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1458 public: |
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1459 // The header and footer are printed in the constructor and |
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1460 // destructor respectively. |
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1461 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name); |
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1462 virtual bool doHeapRegion(HeapRegion* r); |
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1463 ~G1PrintRegionLivenessInfoClosure(); |
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1464 }; |
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1972 | 1466 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP |