Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/concurrentMark.hpp @ 23660:b5f3a471e646
Merge.
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 01 Jun 2016 00:11:44 +0200 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP | |
27 | |
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28 #include "classfile/javaClasses.hpp" |
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29 #include "gc_implementation/g1/heapRegionSet.hpp" |
20337 | 30 #include "gc_implementation/g1/g1RegionToSpaceMapper.hpp" |
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31 #include "gc_implementation/shared/gcId.hpp" |
1972 | 32 #include "utilities/taskqueue.hpp" |
33 | |
342 | 34 class G1CollectedHeap; |
20337 | 35 class CMBitMap; |
342 | 36 class CMTask; |
6197 | 37 typedef GenericTaskQueue<oop, mtGC> CMTaskQueue; |
38 typedef GenericTaskQueueSet<CMTaskQueue, mtGC> CMTaskQueueSet; | |
342 | 39 |
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40 // Closure used by CM during concurrent reference discovery |
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41 // and reference processing (during remarking) to determine |
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42 // if a particular object is alive. It is primarily used |
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43 // to determine if referents of discovered reference objects |
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44 // are alive. An instance is also embedded into the |
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45 // reference processor as the _is_alive_non_header field |
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46 class G1CMIsAliveClosure: public BoolObjectClosure { |
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47 G1CollectedHeap* _g1; |
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48 public: |
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49 G1CMIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) { } |
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50 |
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51 bool do_object_b(oop obj); |
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52 }; |
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53 |
342 | 54 // A generic CM bit map. This is essentially a wrapper around the BitMap |
55 // class, with one bit per (1<<_shifter) HeapWords. | |
56 | |
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57 class CMBitMapRO VALUE_OBJ_CLASS_SPEC { |
342 | 58 protected: |
59 HeapWord* _bmStartWord; // base address of range covered by map | |
60 size_t _bmWordSize; // map size (in #HeapWords covered) | |
61 const int _shifter; // map to char or bit | |
62 BitMap _bm; // the bit map itself | |
63 | |
64 public: | |
65 // constructor | |
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66 CMBitMapRO(int shifter); |
342 | 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()". | |
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91 HeapWord* getNextMarkedWordAddress(const HeapWord* addr, |
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92 const HeapWord* limit = NULL) const; |
342 | 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()". | |
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96 HeapWord* getNextUnmarkedWordAddress(const HeapWord* addr, |
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97 const HeapWord* limit = NULL) const; |
342 | 98 |
99 // conversion utilities | |
100 HeapWord* offsetToHeapWord(size_t offset) const { | |
101 return _bmStartWord + (offset << _shifter); | |
102 } | |
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103 size_t heapWordToOffset(const HeapWord* addr) const { |
342 | 104 return pointer_delta(addr, _bmStartWord) >> _shifter; |
105 } | |
106 int heapWordDiffToOffsetDiff(size_t diff) const; | |
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107 |
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108 // The argument addr should be the start address of a valid object |
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109 HeapWord* nextObject(HeapWord* addr) { |
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110 oop obj = (oop) addr; |
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111 HeapWord* res = addr + obj->size(); |
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112 assert(offsetToHeapWord(heapWordToOffset(res)) == res, "sanity"); |
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113 return res; |
342 | 114 } |
115 | |
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116 void print_on_error(outputStream* st, const char* prefix) const; |
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117 |
342 | 118 // debugging |
20337 | 119 NOT_PRODUCT(bool covers(MemRegion rs) const;) |
120 }; | |
121 | |
122 class CMBitMapMappingChangedListener : public G1MappingChangedListener { | |
123 private: | |
124 CMBitMap* _bm; | |
125 public: | |
126 CMBitMapMappingChangedListener() : _bm(NULL) {} | |
127 | |
128 void set_bitmap(CMBitMap* bm) { _bm = bm; } | |
129 | |
20543 | 130 virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled); |
342 | 131 }; |
132 | |
133 class CMBitMap : public CMBitMapRO { | |
20337 | 134 private: |
135 CMBitMapMappingChangedListener _listener; | |
342 | 136 |
137 public: | |
20337 | 138 static size_t compute_size(size_t heap_size); |
139 // Returns the amount of bytes on the heap between two marks in the bitmap. | |
140 static size_t mark_distance(); | |
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141 |
20337 | 142 CMBitMap() : CMBitMapRO(LogMinObjAlignment), _listener() { _listener.set_bitmap(this); } |
342 | 143 |
20337 | 144 // Initializes the underlying BitMap to cover the given area. |
145 void initialize(MemRegion heap, G1RegionToSpaceMapper* storage); | |
146 | |
147 // Write marks. | |
148 inline void mark(HeapWord* addr); | |
149 inline void clear(HeapWord* addr); | |
150 inline bool parMark(HeapWord* addr); | |
151 inline bool parClear(HeapWord* addr); | |
152 | |
342 | 153 void markRange(MemRegion mr); |
154 void clearRange(MemRegion mr); | |
155 | |
156 // Starting at the bit corresponding to "addr" (inclusive), find the next | |
157 // "1" bit, if any. This bit starts some run of consecutive "1"'s; find | |
158 // the end of this run (stopping at "end_addr"). Return the MemRegion | |
159 // covering from the start of the region corresponding to the first bit | |
160 // of the run to the end of the region corresponding to the last bit of | |
161 // the run. If there is no "1" bit at or after "addr", return an empty | |
162 // MemRegion. | |
163 MemRegion getAndClearMarkedRegion(HeapWord* addr, HeapWord* end_addr); | |
20337 | 164 |
165 // Clear the whole mark bitmap. | |
166 void clearAll(); | |
342 | 167 }; |
168 | |
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169 // Represents a marking stack used by ConcurrentMarking in the G1 collector. |
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170 class CMMarkStack VALUE_OBJ_CLASS_SPEC { |
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171 VirtualSpace _virtual_space; // Underlying backing store for actual stack |
342 | 172 ConcurrentMark* _cm; |
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173 oop* _base; // bottom of stack |
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174 jint _index; // one more than last occupied index |
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175 jint _capacity; // max #elements |
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176 jint _saved_index; // value of _index saved at start of GC |
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177 NOT_PRODUCT(jint _max_depth;) // max depth plumbed during run |
342 | 178 |
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179 bool _overflow; |
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180 bool _should_expand; |
342 | 181 DEBUG_ONLY(bool _drain_in_progress;) |
182 DEBUG_ONLY(bool _drain_in_progress_yields;) | |
183 | |
184 public: | |
185 CMMarkStack(ConcurrentMark* cm); | |
186 ~CMMarkStack(); | |
187 | |
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188 #ifndef PRODUCT |
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189 jint max_depth() const { |
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190 return _max_depth; |
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191 } |
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192 #endif |
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193 |
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194 bool allocate(size_t capacity); |
342 | 195 |
196 oop pop() { | |
197 if (!isEmpty()) { | |
198 return _base[--_index] ; | |
199 } | |
200 return NULL; | |
201 } | |
202 | |
203 // If overflow happens, don't do the push, and record the overflow. | |
204 // *Requires* that "ptr" is already marked. | |
205 void push(oop ptr) { | |
206 if (isFull()) { | |
207 // Record overflow. | |
208 _overflow = true; | |
209 return; | |
210 } else { | |
211 _base[_index++] = ptr; | |
212 NOT_PRODUCT(_max_depth = MAX2(_max_depth, _index)); | |
213 } | |
214 } | |
215 // Non-block impl. Note: concurrency is allowed only with other | |
216 // "par_push" operations, not with "pop" or "drain". We would need | |
217 // parallel versions of them if such concurrency was desired. | |
218 void par_push(oop ptr); | |
219 | |
220 // Pushes the first "n" elements of "ptr_arr" on the stack. | |
221 // Non-block impl. Note: concurrency is allowed only with other | |
222 // "par_adjoin_arr" or "push" operations, not with "pop" or "drain". | |
223 void par_adjoin_arr(oop* ptr_arr, int n); | |
224 | |
225 // Pushes the first "n" elements of "ptr_arr" on the stack. | |
226 // Locking impl: concurrency is allowed only with | |
227 // "par_push_arr" and/or "par_pop_arr" operations, which use the same | |
228 // locking strategy. | |
229 void par_push_arr(oop* ptr_arr, int n); | |
230 | |
231 // If returns false, the array was empty. Otherwise, removes up to "max" | |
232 // elements from the stack, and transfers them to "ptr_arr" in an | |
233 // unspecified order. The actual number transferred is given in "n" ("n | |
234 // == 0" is deliberately redundant with the return value.) Locking impl: | |
235 // concurrency is allowed only with "par_push_arr" and/or "par_pop_arr" | |
236 // operations, which use the same locking strategy. | |
237 bool par_pop_arr(oop* ptr_arr, int max, int* n); | |
238 | |
239 // Drain the mark stack, applying the given closure to all fields of | |
240 // objects on the stack. (That is, continue until the stack is empty, | |
241 // even if closure applications add entries to the stack.) The "bm" | |
242 // argument, if non-null, may be used to verify that only marked objects | |
243 // are on the mark stack. If "yield_after" is "true", then the | |
244 // concurrent marker performing the drain offers to yield after | |
245 // processing each object. If a yield occurs, stops the drain operation | |
246 // and returns false. Otherwise, returns true. | |
247 template<class OopClosureClass> | |
248 bool drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after = false); | |
249 | |
250 bool isEmpty() { return _index == 0; } | |
251 bool isFull() { return _index == _capacity; } | |
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252 int maxElems() { return _capacity; } |
342 | 253 |
254 bool overflow() { return _overflow; } | |
255 void clear_overflow() { _overflow = false; } | |
256 | |
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257 bool should_expand() const { return _should_expand; } |
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258 void set_should_expand(); |
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259 |
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260 // Expand the stack, typically in response to an overflow condition |
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261 void expand(); |
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262 |
342 | 263 int size() { return _index; } |
264 | |
265 void setEmpty() { _index = 0; clear_overflow(); } | |
266 | |
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267 // Record the current index. |
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268 void note_start_of_gc(); |
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269 |
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270 // Make sure that we have not added any entries to the stack during GC. |
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271 void note_end_of_gc(); |
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272 |
342 | 273 // iterate over the oops in the mark stack, up to the bound recorded via |
274 // the call above. | |
275 void oops_do(OopClosure* f); | |
276 }; | |
277 | |
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278 class ForceOverflowSettings VALUE_OBJ_CLASS_SPEC { |
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279 private: |
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280 #ifndef PRODUCT |
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281 uintx _num_remaining; |
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282 bool _force; |
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283 #endif // !defined(PRODUCT) |
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284 |
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285 public: |
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286 void init() PRODUCT_RETURN; |
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287 void update() PRODUCT_RETURN; |
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288 bool should_force() PRODUCT_RETURN_( return false; ); |
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289 }; |
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290 |
342 | 291 // this will enable a variety of different statistics per GC task |
292 #define _MARKING_STATS_ 0 | |
293 // this will enable the higher verbose levels | |
294 #define _MARKING_VERBOSE_ 0 | |
295 | |
296 #if _MARKING_STATS_ | |
297 #define statsOnly(statement) \ | |
298 do { \ | |
299 statement ; \ | |
300 } while (0) | |
301 #else // _MARKING_STATS_ | |
302 #define statsOnly(statement) \ | |
303 do { \ | |
304 } while (0) | |
305 #endif // _MARKING_STATS_ | |
306 | |
307 typedef enum { | |
308 no_verbose = 0, // verbose turned off | |
309 stats_verbose, // only prints stats at the end of marking | |
310 low_verbose, // low verbose, mostly per region and per major event | |
311 medium_verbose, // a bit more detailed than low | |
312 high_verbose // per object verbose | |
313 } CMVerboseLevel; | |
314 | |
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315 class YoungList; |
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316 |
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317 // Root Regions are regions that are not empty at the beginning of a |
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318 // marking cycle and which we might collect during an evacuation pause |
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319 // while the cycle is active. Given that, during evacuation pauses, we |
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320 // do not copy objects that are explicitly marked, what we have to do |
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321 // for the root regions is to scan them and mark all objects reachable |
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322 // from them. According to the SATB assumptions, we only need to visit |
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323 // each object once during marking. So, as long as we finish this scan |
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324 // before the next evacuation pause, we can copy the objects from the |
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325 // root regions without having to mark them or do anything else to them. |
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326 // |
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327 // Currently, we only support root region scanning once (at the start |
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328 // of the marking cycle) and the root regions are all the survivor |
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329 // regions populated during the initial-mark pause. |
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330 class CMRootRegions VALUE_OBJ_CLASS_SPEC { |
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331 private: |
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332 YoungList* _young_list; |
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333 ConcurrentMark* _cm; |
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334 |
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335 volatile bool _scan_in_progress; |
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336 volatile bool _should_abort; |
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337 HeapRegion* volatile _next_survivor; |
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338 |
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339 public: |
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340 CMRootRegions(); |
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341 // We actually do most of the initialization in this method. |
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342 void init(G1CollectedHeap* g1h, ConcurrentMark* cm); |
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343 |
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344 // Reset the claiming / scanning of the root regions. |
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345 void prepare_for_scan(); |
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346 |
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347 // Forces get_next() to return NULL so that the iteration aborts early. |
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348 void abort() { _should_abort = true; } |
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349 |
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350 // Return true if the CM thread are actively scanning root regions, |
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351 // false otherwise. |
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352 bool scan_in_progress() { return _scan_in_progress; } |
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353 |
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354 // Claim the next root region to scan atomically, or return NULL if |
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355 // all have been claimed. |
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356 HeapRegion* claim_next(); |
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357 |
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358 // Flag that we're done with root region scanning and notify anyone |
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359 // who's waiting on it. If aborted is false, assume that all regions |
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360 // have been claimed. |
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361 void scan_finished(); |
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362 |
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363 // If CM threads are still scanning root regions, wait until they |
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364 // are done. Return true if we had to wait, false otherwise. |
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365 bool wait_until_scan_finished(); |
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366 }; |
342 | 367 |
368 class ConcurrentMarkThread; | |
369 | |
6197 | 370 class ConcurrentMark: public CHeapObj<mtGC> { |
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371 friend class CMMarkStack; |
342 | 372 friend class ConcurrentMarkThread; |
373 friend class CMTask; | |
374 friend class CMBitMapClosure; | |
375 friend class CMGlobalObjectClosure; | |
376 friend class CMRemarkTask; | |
377 friend class CMConcurrentMarkingTask; | |
378 friend class G1ParNoteEndTask; | |
379 friend class CalcLiveObjectsClosure; | |
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380 friend class G1CMRefProcTaskProxy; |
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381 friend class G1CMRefProcTaskExecutor; |
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382 friend class G1CMKeepAliveAndDrainClosure; |
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383 friend class G1CMDrainMarkingStackClosure; |
342 | 384 |
385 protected: | |
386 ConcurrentMarkThread* _cmThread; // the thread doing the work | |
387 G1CollectedHeap* _g1h; // the heap. | |
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388 uint _parallel_marking_threads; // the number of marking |
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389 // threads we're use |
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390 uint _max_parallel_marking_threads; // max number of marking |
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391 // threads we'll ever use |
342 | 392 double _sleep_factor; // how much we have to sleep, with |
393 // respect to the work we just did, to | |
394 // meet the marking overhead goal | |
395 double _marking_task_overhead; // marking target overhead for | |
396 // a single task | |
397 | |
398 // same as the two above, but for the cleanup task | |
399 double _cleanup_sleep_factor; | |
400 double _cleanup_task_overhead; | |
401 | |
2152 | 402 FreeRegionList _cleanup_list; |
342 | 403 |
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404 // Concurrent marking support structures |
342 | 405 CMBitMap _markBitMap1; |
406 CMBitMap _markBitMap2; | |
407 CMBitMapRO* _prevMarkBitMap; // completed mark bitmap | |
408 CMBitMap* _nextMarkBitMap; // under-construction mark bitmap | |
409 | |
410 BitMap _region_bm; | |
411 BitMap _card_bm; | |
412 | |
413 // Heap bounds | |
414 HeapWord* _heap_start; | |
415 HeapWord* _heap_end; | |
416 | |
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417 // Root region tracking and claiming. |
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418 CMRootRegions _root_regions; |
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419 |
342 | 420 // For gray objects |
421 CMMarkStack _markStack; // Grey objects behind global finger. | |
422 HeapWord* volatile _finger; // the global finger, region aligned, | |
423 // always points to the end of the | |
424 // last claimed region | |
425 | |
426 // marking tasks | |
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427 uint _max_worker_id;// maximum worker id |
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428 uint _active_tasks; // task num currently active |
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429 CMTask** _tasks; // task queue array (max_worker_id len) |
342 | 430 CMTaskQueueSet* _task_queues; // task queue set |
431 ParallelTaskTerminator _terminator; // for termination | |
432 | |
433 // Two sync barriers that are used to synchronise tasks when an | |
434 // overflow occurs. The algorithm is the following. All tasks enter | |
435 // the first one to ensure that they have all stopped manipulating | |
436 // the global data structures. After they exit it, they re-initialise | |
437 // their data structures and task 0 re-initialises the global data | |
438 // structures. Then, they enter the second sync barrier. This | |
439 // ensure, that no task starts doing work before all data | |
440 // structures (local and global) have been re-initialised. When they | |
441 // exit it, they are free to start working again. | |
442 WorkGangBarrierSync _first_overflow_barrier_sync; | |
443 WorkGangBarrierSync _second_overflow_barrier_sync; | |
444 | |
445 // this is set by any task, when an overflow on the global data | |
446 // structures is detected. | |
447 volatile bool _has_overflown; | |
448 // true: marking is concurrent, false: we're in remark | |
449 volatile bool _concurrent; | |
450 // set at the end of a Full GC so that marking aborts | |
451 volatile bool _has_aborted; | |
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452 GCId _aborted_gc_id; |
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453 |
342 | 454 // used when remark aborts due to an overflow to indicate that |
455 // another concurrent marking phase should start | |
456 volatile bool _restart_for_overflow; | |
457 | |
458 // This is true from the very start of concurrent marking until the | |
459 // point when all the tasks complete their work. It is really used | |
460 // to determine the points between the end of concurrent marking and | |
461 // time of remark. | |
462 volatile bool _concurrent_marking_in_progress; | |
463 | |
464 // verbose level | |
465 CMVerboseLevel _verbose_level; | |
466 | |
467 // All of these times are in ms. | |
468 NumberSeq _init_times; | |
469 NumberSeq _remark_times; | |
470 NumberSeq _remark_mark_times; | |
471 NumberSeq _remark_weak_ref_times; | |
472 NumberSeq _cleanup_times; | |
473 double _total_counting_time; | |
474 double _total_rs_scrub_time; | |
475 | |
476 double* _accum_task_vtime; // accumulated task vtime | |
477 | |
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478 FlexibleWorkGang* _parallel_workers; |
342 | 479 |
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480 ForceOverflowSettings _force_overflow_conc; |
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481 ForceOverflowSettings _force_overflow_stw; |
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482 |
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483 void weakRefsWorkParallelPart(BoolObjectClosure* is_alive, bool purged_classes); |
342 | 484 void weakRefsWork(bool clear_all_soft_refs); |
485 | |
486 void swapMarkBitMaps(); | |
487 | |
488 // It resets the global marking data structures, as well as the | |
489 // task local ones; should be called during initial mark. | |
490 void reset(); | |
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491 |
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492 // Resets all the marking data structures. Called when we have to restart |
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493 // marking or when marking completes (via set_non_marking_state below). |
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494 void reset_marking_state(bool clear_overflow = true); |
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495 |
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496 // We do this after we're done with marking so that the marking data |
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497 // structures are initialised to a sensible and predictable state. |
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498 void set_non_marking_state(); |
342 | 499 |
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500 // Called to indicate how many threads are currently active. |
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501 void set_concurrency(uint active_tasks); |
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502 |
342 | 503 // It should be called to indicate which phase we're in (concurrent |
504 // mark or remark) and how many threads are currently active. | |
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505 void set_concurrency_and_phase(uint active_tasks, bool concurrent); |
342 | 506 |
507 // prints all gathered CM-related statistics | |
508 void print_stats(); | |
509 | |
2152 | 510 bool cleanup_list_is_empty() { |
511 return _cleanup_list.is_empty(); | |
512 } | |
513 | |
342 | 514 // accessor methods |
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515 uint parallel_marking_threads() const { return _parallel_marking_threads; } |
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516 uint max_parallel_marking_threads() const { return _max_parallel_marking_threads;} |
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517 double sleep_factor() { return _sleep_factor; } |
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518 double marking_task_overhead() { return _marking_task_overhead;} |
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519 double cleanup_sleep_factor() { return _cleanup_sleep_factor; } |
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520 double cleanup_task_overhead() { return _cleanup_task_overhead;} |
342 | 521 |
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522 bool use_parallel_marking_threads() const { |
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523 assert(parallel_marking_threads() <= |
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524 max_parallel_marking_threads(), "sanity"); |
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525 assert((_parallel_workers == NULL && parallel_marking_threads() == 0) || |
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526 parallel_marking_threads() > 0, |
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527 "parallel workers not set up correctly"); |
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528 return _parallel_workers != NULL; |
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529 } |
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530 |
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531 HeapWord* finger() { return _finger; } |
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532 bool concurrent() { return _concurrent; } |
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533 uint active_tasks() { return _active_tasks; } |
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534 ParallelTaskTerminator* terminator() { return &_terminator; } |
342 | 535 |
536 // It claims the next available region to be scanned by a marking | |
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537 // task/thread. It might return NULL if the next region is empty or |
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538 // we have run out of regions. In the latter case, out_of_regions() |
342 | 539 // determines whether we've really run out of regions or the task |
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540 // should call claim_region() again. This might seem a bit |
342 | 541 // awkward. Originally, the code was written so that claim_region() |
542 // either successfully returned with a non-empty region or there | |
543 // were no more regions to be claimed. The problem with this was | |
544 // that, in certain circumstances, it iterated over large chunks of | |
545 // the heap finding only empty regions and, while it was working, it | |
546 // was preventing the calling task to call its regular clock | |
547 // method. So, this way, each task will spend very little time in | |
548 // claim_region() and is allowed to call the regular clock method | |
549 // frequently. | |
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550 HeapRegion* claim_region(uint worker_id); |
342 | 551 |
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552 // It determines whether we've run out of regions to scan. Note that |
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553 // the finger can point past the heap end in case the heap was expanded |
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554 // to satisfy an allocation without doing a GC. This is fine, because all |
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555 // objects in those regions will be considered live anyway because of |
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556 // SATB guarantees (i.e. their TAMS will be equal to bottom). |
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557 bool out_of_regions() { return _finger >= _heap_end; } |
342 | 558 |
559 // Returns the task with the given id | |
560 CMTask* task(int id) { | |
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561 assert(0 <= id && id < (int) _active_tasks, |
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562 "task id not within active bounds"); |
342 | 563 return _tasks[id]; |
564 } | |
565 | |
566 // Returns the task queue with the given id | |
567 CMTaskQueue* task_queue(int id) { | |
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568 assert(0 <= id && id < (int) _active_tasks, |
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569 "task queue id not within active bounds"); |
342 | 570 return (CMTaskQueue*) _task_queues->queue(id); |
571 } | |
572 | |
573 // Returns the task queue set | |
574 CMTaskQueueSet* task_queues() { return _task_queues; } | |
575 | |
576 // Access / manipulation of the overflow flag which is set to | |
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577 // indicate that the global stack has overflown |
342 | 578 bool has_overflown() { return _has_overflown; } |
579 void set_has_overflown() { _has_overflown = true; } | |
580 void clear_has_overflown() { _has_overflown = false; } | |
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581 bool restart_for_overflow() { return _restart_for_overflow; } |
342 | 582 |
583 // Methods to enter the two overflow sync barriers | |
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584 void enter_first_sync_barrier(uint worker_id); |
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585 void enter_second_sync_barrier(uint worker_id); |
342 | 586 |
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587 ForceOverflowSettings* force_overflow_conc() { |
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588 return &_force_overflow_conc; |
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589 } |
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590 |
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591 ForceOverflowSettings* force_overflow_stw() { |
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592 return &_force_overflow_stw; |
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593 } |
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594 |
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595 ForceOverflowSettings* force_overflow() { |
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596 if (concurrent()) { |
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597 return force_overflow_conc(); |
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598 } else { |
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599 return force_overflow_stw(); |
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600 } |
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601 } |
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602 |
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603 // Live Data Counting data structures... |
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604 // These data structures are initialized at the start of |
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605 // marking. They are written to while marking is active. |
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606 // They are aggregated during remark; the aggregated values |
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607 // are then used to populate the _region_bm, _card_bm, and |
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608 // the total live bytes, which are then subsequently updated |
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609 // during cleanup. |
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610 |
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611 // An array of bitmaps (one bit map per task). Each bitmap |
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612 // is used to record the cards spanned by the live objects |
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613 // marked by that task/worker. |
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614 BitMap* _count_card_bitmaps; |
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615 |
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616 // Used to record the number of marked live bytes |
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617 // (for each region, by worker thread). |
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618 size_t** _count_marked_bytes; |
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619 |
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620 // Card index of the bottom of the G1 heap. Used for biasing indices into |
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621 // the card bitmaps. |
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622 intptr_t _heap_bottom_card_num; |
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623 |
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624 // Set to true when initialization is complete |
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625 bool _completed_initialization; |
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626 |
342 | 627 public: |
628 // Manipulation of the global mark stack. | |
629 // Notice that the first mark_stack_push is CAS-based, whereas the | |
630 // two below are Mutex-based. This is OK since the first one is only | |
631 // called during evacuation pauses and doesn't compete with the | |
632 // other two (which are called by the marking tasks during | |
633 // concurrent marking or remark). | |
634 bool mark_stack_push(oop p) { | |
635 _markStack.par_push(p); | |
636 if (_markStack.overflow()) { | |
637 set_has_overflown(); | |
638 return false; | |
639 } | |
640 return true; | |
641 } | |
642 bool mark_stack_push(oop* arr, int n) { | |
643 _markStack.par_push_arr(arr, n); | |
644 if (_markStack.overflow()) { | |
645 set_has_overflown(); | |
646 return false; | |
647 } | |
648 return true; | |
649 } | |
650 void mark_stack_pop(oop* arr, int max, int* n) { | |
651 _markStack.par_pop_arr(arr, max, n); | |
652 } | |
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653 size_t mark_stack_size() { return _markStack.size(); } |
342 | 654 size_t partial_mark_stack_size_target() { return _markStack.maxElems()/3; } |
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655 bool mark_stack_overflow() { return _markStack.overflow(); } |
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656 bool mark_stack_empty() { return _markStack.isEmpty(); } |
342 | 657 |
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658 CMRootRegions* root_regions() { return &_root_regions; } |
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659 |
342 | 660 bool concurrent_marking_in_progress() { |
661 return _concurrent_marking_in_progress; | |
662 } | |
663 void set_concurrent_marking_in_progress() { | |
664 _concurrent_marking_in_progress = true; | |
665 } | |
666 void clear_concurrent_marking_in_progress() { | |
667 _concurrent_marking_in_progress = false; | |
668 } | |
669 | |
670 void update_accum_task_vtime(int i, double vtime) { | |
671 _accum_task_vtime[i] += vtime; | |
672 } | |
673 | |
674 double all_task_accum_vtime() { | |
675 double ret = 0.0; | |
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676 for (uint i = 0; i < _max_worker_id; ++i) |
342 | 677 ret += _accum_task_vtime[i]; |
678 return ret; | |
679 } | |
680 | |
681 // Attempts to steal an object from the task queues of other tasks | |
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682 bool try_stealing(uint worker_id, int* hash_seed, oop& obj) { |
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683 return _task_queues->steal(worker_id, hash_seed, obj); |
342 | 684 } |
685 | |
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686 ConcurrentMark(G1CollectedHeap* g1h, |
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687 G1RegionToSpaceMapper* prev_bitmap_storage, |
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688 G1RegionToSpaceMapper* next_bitmap_storage); |
342 | 689 ~ConcurrentMark(); |
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690 |
342 | 691 ConcurrentMarkThread* cmThread() { return _cmThread; } |
692 | |
693 CMBitMapRO* prevMarkBitMap() const { return _prevMarkBitMap; } | |
694 CMBitMap* nextMarkBitMap() const { return _nextMarkBitMap; } | |
695 | |
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696 // Returns the number of GC threads to be used in a concurrent |
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697 // phase based on the number of GC threads being used in a STW |
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698 // phase. |
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699 uint scale_parallel_threads(uint n_par_threads); |
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700 |
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701 // Calculates the number of GC threads to be used in a concurrent phase. |
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702 uint calc_parallel_marking_threads(); |
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703 |
342 | 704 // The following three are interaction between CM and |
705 // G1CollectedHeap | |
706 | |
707 // This notifies CM that a root during initial-mark needs to be | |
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708 // grayed. It is MT-safe. word_size is the size of the object in |
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709 // words. It is passed explicitly as sometimes we cannot calculate |
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710 // it from the given object because it might be in an inconsistent |
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711 // state (e.g., in to-space and being copied). So the caller is |
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712 // responsible for dealing with this issue (e.g., get the size from |
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713 // the from-space image when the to-space image might be |
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714 // inconsistent) and always passing the size. hr is the region that |
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715 // contains the object and it's passed optionally from callers who |
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716 // might already have it (no point in recalculating it). |
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717 inline void grayRoot(oop obj, |
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718 size_t word_size, |
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719 uint worker_id, |
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720 HeapRegion* hr = NULL); |
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721 |
1388 | 722 // It iterates over the heap and for each object it comes across it |
723 // will dump the contents of its reference fields, as well as | |
724 // liveness information for the object and its referents. The dump | |
725 // will be written to a file with the following name: | |
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726 // G1PrintReachableBaseFile + "." + str. |
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727 // vo decides whether the prev (vo == UsePrevMarking), the next |
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728 // (vo == UseNextMarking) marking information, or the mark word |
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729 // (vo == UseMarkWord) will be used to determine the liveness of |
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730 // each object / referent. |
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731 // If all is true, all objects in the heap will be dumped, otherwise |
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732 // only the live ones. In the dump the following symbols / breviations |
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733 // are used: |
1388 | 734 // M : an explicitly live object (its bitmap bit is set) |
735 // > : an implicitly live object (over tams) | |
736 // O : an object outside the G1 heap (typically: in the perm gen) | |
737 // NOT : a reference field whose referent is not live | |
738 // AND MARKED : indicates that an object is both explicitly and | |
739 // implicitly live (it should be one or the other, not both) | |
740 void print_reachable(const char* str, | |
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741 VerifyOption vo, |
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742 bool all) PRODUCT_RETURN; |
342 | 743 |
744 // Clear the next marking bitmap (will be called concurrently). | |
745 void clearNextBitmap(); | |
746 | |
20337 | 747 // Return whether the next mark bitmap has no marks set. To be used for assertions |
748 // only. Will not yield to pause requests. | |
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749 bool nextMarkBitmapIsClear(); |
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750 |
342 | 751 // These two do the work that needs to be done before and after the |
752 // initial root checkpoint. Since this checkpoint can be done at two | |
753 // different points (i.e. an explicit pause or piggy-backed on a | |
754 // young collection), then it's nice to be able to easily share the | |
755 // pre/post code. It might be the case that we can put everything in | |
756 // the post method. TP | |
757 void checkpointRootsInitialPre(); | |
758 void checkpointRootsInitialPost(); | |
759 | |
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760 // Scan all the root regions and mark everything reachable from |
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761 // them. |
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762 void scanRootRegions(); |
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763 |
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764 // Scan a single root region and mark everything reachable from it. |
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765 void scanRootRegion(HeapRegion* hr, uint worker_id); |
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766 |
342 | 767 // Do concurrent phase of marking, to a tentative transitive closure. |
768 void markFromRoots(); | |
769 | |
770 void checkpointRootsFinal(bool clear_all_soft_refs); | |
771 void checkpointRootsFinalWork(); | |
772 void cleanup(); | |
773 void completeCleanup(); | |
774 | |
775 // Mark in the previous bitmap. NB: this is usually read-only, so use | |
776 // this carefully! | |
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777 inline void markPrev(oop p); |
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778 |
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779 // Clears marks for all objects in the given range, for the prev or |
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780 // next bitmaps. NB: the previous bitmap is usually |
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781 // read-only, so use this carefully! |
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782 void clearRangePrevBitmap(MemRegion mr); |
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783 void clearRangeNextBitmap(MemRegion mr); |
342 | 784 |
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785 // Notify data structures that a GC has started. |
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786 void note_start_of_gc() { |
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787 _markStack.note_start_of_gc(); |
342 | 788 } |
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789 |
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790 // Notify data structures that a GC is finished. |
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791 void note_end_of_gc() { |
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792 _markStack.note_end_of_gc(); |
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793 } |
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794 |
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795 // Verify that there are no CSet oops on the stacks (taskqueues / |
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796 // global mark stack) and fingers (global / per-task). |
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797 // If marking is not in progress, it's a no-op. |
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798 void verify_no_cset_oops() PRODUCT_RETURN; |
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799 |
342 | 800 bool isPrevMarked(oop p) const { |
801 assert(p != NULL && p->is_oop(), "expected an oop"); | |
802 HeapWord* addr = (HeapWord*)p; | |
803 assert(addr >= _prevMarkBitMap->startWord() || | |
804 addr < _prevMarkBitMap->endWord(), "in a region"); | |
805 | |
806 return _prevMarkBitMap->isMarked(addr); | |
807 } | |
808 | |
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809 inline bool do_yield_check(uint worker_i = 0); |
342 | 810 |
811 // Called to abort the marking cycle after a Full GC takes palce. | |
812 void abort(); | |
813 | |
10405 | 814 bool has_aborted() { return _has_aborted; } |
815 | |
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816 const GCId& concurrent_gc_id(); |
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817 |
342 | 818 // This prints the global/local fingers. It is used for debugging. |
819 NOT_PRODUCT(void print_finger();) | |
820 | |
821 void print_summary_info(); | |
822 | |
1019 | 823 void print_worker_threads_on(outputStream* st) const; |
824 | |
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825 void print_on_error(outputStream* st) const; |
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826 |
342 | 827 // The following indicate whether a given verbose level has been |
828 // set. Notice that anything above stats is conditional to | |
829 // _MARKING_VERBOSE_ having been set to 1 | |
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830 bool verbose_stats() { |
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831 return _verbose_level >= stats_verbose; |
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832 } |
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833 bool verbose_low() { |
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834 return _MARKING_VERBOSE_ && _verbose_level >= low_verbose; |
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835 } |
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836 bool verbose_medium() { |
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837 return _MARKING_VERBOSE_ && _verbose_level >= medium_verbose; |
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838 } |
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839 bool verbose_high() { |
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840 return _MARKING_VERBOSE_ && _verbose_level >= high_verbose; |
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841 } |
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842 |
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843 // Liveness counting |
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844 |
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845 // Utility routine to set an exclusive range of cards on the given |
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846 // card liveness bitmap |
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847 inline void set_card_bitmap_range(BitMap* card_bm, |
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848 BitMap::idx_t start_idx, |
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849 BitMap::idx_t end_idx, |
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850 bool is_par); |
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851 |
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852 // Returns the card number of the bottom of the G1 heap. |
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853 // Used in biasing indices into accounting card bitmaps. |
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854 intptr_t heap_bottom_card_num() const { |
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855 return _heap_bottom_card_num; |
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856 } |
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857 |
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858 // Returns the card bitmap for a given task or worker id. |
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859 BitMap* count_card_bitmap_for(uint worker_id) { |
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860 assert(0 <= worker_id && worker_id < _max_worker_id, "oob"); |
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861 assert(_count_card_bitmaps != NULL, "uninitialized"); |
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862 BitMap* task_card_bm = &_count_card_bitmaps[worker_id]; |
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863 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
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864 return task_card_bm; |
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865 } |
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866 |
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867 // Returns the array containing the marked bytes for each region, |
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868 // for the given worker or task id. |
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869 size_t* count_marked_bytes_array_for(uint worker_id) { |
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870 assert(0 <= worker_id && worker_id < _max_worker_id, "oob"); |
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871 assert(_count_marked_bytes != NULL, "uninitialized"); |
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872 size_t* marked_bytes_array = _count_marked_bytes[worker_id]; |
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873 assert(marked_bytes_array != NULL, "uninitialized"); |
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874 return marked_bytes_array; |
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875 } |
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876 |
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877 // Returns the index in the liveness accounting card table bitmap |
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878 // for the given address |
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879 inline BitMap::idx_t card_bitmap_index_for(HeapWord* addr); |
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880 |
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881 // Counts the size of the given memory region in the the given |
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882 // marked_bytes array slot for the given HeapRegion. |
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883 // Sets the bits in the given card bitmap that are associated with the |
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884 // cards that are spanned by the memory region. |
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885 inline void count_region(MemRegion mr, |
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886 HeapRegion* hr, |
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887 size_t* marked_bytes_array, |
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888 BitMap* task_card_bm); |
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889 |
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890 // Counts the given memory region in the task/worker counting |
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891 // data structures for the given worker id. |
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892 inline void count_region(MemRegion mr, HeapRegion* hr, uint worker_id); |
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893 |
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894 // Counts the given object in the given task/worker counting |
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895 // data structures. |
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896 inline void count_object(oop obj, |
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897 HeapRegion* hr, |
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898 size_t* marked_bytes_array, |
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899 BitMap* task_card_bm); |
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900 |
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901 // Attempts to mark the given object and, if successful, counts |
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902 // the object in the given task/worker counting structures. |
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903 inline bool par_mark_and_count(oop obj, |
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904 HeapRegion* hr, |
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905 size_t* marked_bytes_array, |
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906 BitMap* task_card_bm); |
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907 |
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908 // Attempts to mark the given object and, if successful, counts |
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909 // the object in the task/worker counting structures for the |
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910 // given worker id. |
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911 inline bool par_mark_and_count(oop obj, |
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912 size_t word_size, |
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913 HeapRegion* hr, |
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914 uint worker_id); |
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915 |
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916 // Returns true if initialization was successfully completed. |
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917 bool completed_initialization() const { |
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918 return _completed_initialization; |
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919 } |
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920 |
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921 protected: |
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922 // Clear all the per-task bitmaps and arrays used to store the |
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923 // counting data. |
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924 void clear_all_count_data(); |
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925 |
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926 // Aggregates the counting data for each worker/task |
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927 // that was constructed while marking. Also sets |
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928 // the amount of marked bytes for each region and |
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929 // the top at concurrent mark count. |
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930 void aggregate_count_data(); |
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931 |
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932 // Verification routine |
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933 void verify_count_data(); |
342 | 934 }; |
935 | |
936 // A class representing a marking task. | |
937 class CMTask : public TerminatorTerminator { | |
938 private: | |
939 enum PrivateConstants { | |
940 // the regular clock call is called once the scanned words reaches | |
941 // this limit | |
942 words_scanned_period = 12*1024, | |
943 // the regular clock call is called once the number of visited | |
944 // references reaches this limit | |
945 refs_reached_period = 384, | |
946 // initial value for the hash seed, used in the work stealing code | |
947 init_hash_seed = 17, | |
948 // how many entries will be transferred between global stack and | |
949 // local queues | |
950 global_stack_transfer_size = 16 | |
951 }; | |
952 | |
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953 uint _worker_id; |
342 | 954 G1CollectedHeap* _g1h; |
955 ConcurrentMark* _cm; | |
956 CMBitMap* _nextMarkBitMap; | |
957 // the task queue of this task | |
958 CMTaskQueue* _task_queue; | |
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959 private: |
342 | 960 // the task queue set---needed for stealing |
961 CMTaskQueueSet* _task_queues; | |
962 // indicates whether the task has been claimed---this is only for | |
963 // debugging purposes | |
964 bool _claimed; | |
965 | |
966 // number of calls to this task | |
967 int _calls; | |
968 | |
969 // when the virtual timer reaches this time, the marking step should | |
970 // exit | |
971 double _time_target_ms; | |
972 // the start time of the current marking step | |
973 double _start_time_ms; | |
974 | |
975 // the oop closure used for iterations over oops | |
3771 | 976 G1CMOopClosure* _cm_oop_closure; |
342 | 977 |
978 // the region this task is scanning, NULL if we're not scanning any | |
979 HeapRegion* _curr_region; | |
980 // the local finger of this task, NULL if we're not scanning a region | |
981 HeapWord* _finger; | |
982 // limit of the region this task is scanning, NULL if we're not scanning one | |
983 HeapWord* _region_limit; | |
984 | |
985 // the number of words this task has scanned | |
986 size_t _words_scanned; | |
987 // When _words_scanned reaches this limit, the regular clock is | |
988 // called. Notice that this might be decreased under certain | |
989 // circumstances (i.e. when we believe that we did an expensive | |
990 // operation). | |
991 size_t _words_scanned_limit; | |
992 // the initial value of _words_scanned_limit (i.e. what it was | |
993 // before it was decreased). | |
994 size_t _real_words_scanned_limit; | |
995 | |
996 // the number of references this task has visited | |
997 size_t _refs_reached; | |
998 // When _refs_reached reaches this limit, the regular clock is | |
999 // called. Notice this this might be decreased under certain | |
1000 // circumstances (i.e. when we believe that we did an expensive | |
1001 // operation). | |
1002 size_t _refs_reached_limit; | |
1003 // the initial value of _refs_reached_limit (i.e. what it was before | |
1004 // it was decreased). | |
1005 size_t _real_refs_reached_limit; | |
1006 | |
1007 // used by the work stealing stuff | |
1008 int _hash_seed; | |
1009 // if this is true, then the task has aborted for some reason | |
1010 bool _has_aborted; | |
1011 // set when the task aborts because it has met its time quota | |
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1012 bool _has_timed_out; |
342 | 1013 // true when we're draining SATB buffers; this avoids the task |
1014 // aborting due to SATB buffers being available (as we're already | |
1015 // dealing with them) | |
1016 bool _draining_satb_buffers; | |
1017 | |
1018 // number sequence of past step times | |
1019 NumberSeq _step_times_ms; | |
1020 // elapsed time of this task | |
1021 double _elapsed_time_ms; | |
1022 // termination time of this task | |
1023 double _termination_time_ms; | |
1024 // when this task got into the termination protocol | |
1025 double _termination_start_time_ms; | |
1026 | |
1027 // true when the task is during a concurrent phase, false when it is | |
1028 // in the remark phase (so, in the latter case, we do not have to | |
1029 // check all the things that we have to check during the concurrent | |
1030 // phase, i.e. SATB buffer availability...) | |
1031 bool _concurrent; | |
1032 | |
1033 TruncatedSeq _marking_step_diffs_ms; | |
1034 | |
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1035 // Counting data structures. Embedding the task's marked_bytes_array |
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1036 // and card bitmap into the actual task saves having to go through |
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1037 // the ConcurrentMark object. |
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1038 size_t* _marked_bytes_array; |
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1039 BitMap* _card_bm; |
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1040 |
342 | 1041 // LOTS of statistics related with this task |
1042 #if _MARKING_STATS_ | |
1043 NumberSeq _all_clock_intervals_ms; | |
1044 double _interval_start_time_ms; | |
1045 | |
1046 int _aborted; | |
1047 int _aborted_overflow; | |
1048 int _aborted_cm_aborted; | |
1049 int _aborted_yield; | |
1050 int _aborted_timed_out; | |
1051 int _aborted_satb; | |
1052 int _aborted_termination; | |
1053 | |
1054 int _steal_attempts; | |
1055 int _steals; | |
1056 | |
1057 int _clock_due_to_marking; | |
1058 int _clock_due_to_scanning; | |
1059 | |
1060 int _local_pushes; | |
1061 int _local_pops; | |
1062 int _local_max_size; | |
1063 int _objs_scanned; | |
1064 | |
1065 int _global_pushes; | |
1066 int _global_pops; | |
1067 int _global_max_size; | |
1068 | |
1069 int _global_transfers_to; | |
1070 int _global_transfers_from; | |
1071 | |
1072 int _regions_claimed; | |
1073 int _objs_found_on_bitmap; | |
1074 | |
1075 int _satb_buffers_processed; | |
1076 #endif // _MARKING_STATS_ | |
1077 | |
1078 // it updates the local fields after this task has claimed | |
1079 // a new region to scan | |
1080 void setup_for_region(HeapRegion* hr); | |
1081 // it brings up-to-date the limit of the region | |
1082 void update_region_limit(); | |
1083 | |
1084 // called when either the words scanned or the refs visited limit | |
1085 // has been reached | |
1086 void reached_limit(); | |
1087 // recalculates the words scanned and refs visited limits | |
1088 void recalculate_limits(); | |
1089 // decreases the words scanned and refs visited limits when we reach | |
1090 // an expensive operation | |
1091 void decrease_limits(); | |
1092 // it checks whether the words scanned or refs visited reached their | |
1093 // respective limit and calls reached_limit() if they have | |
1094 void check_limits() { | |
1095 if (_words_scanned >= _words_scanned_limit || | |
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1096 _refs_reached >= _refs_reached_limit) { |
342 | 1097 reached_limit(); |
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1098 } |
342 | 1099 } |
1100 // this is supposed to be called regularly during a marking step as | |
1101 // it checks a bunch of conditions that might cause the marking step | |
1102 // to abort | |
1103 void regular_clock_call(); | |
1104 bool concurrent() { return _concurrent; } | |
1105 | |
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1106 // Test whether obj might have already been passed over by the |
23025 | 1107 // mark bitmap scan, and so needs to be pushed onto the mark stack. |
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1108 bool is_below_finger(oop obj, HeapWord* global_finger) const; |
23025 | 1109 |
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1110 template<bool scan> void process_grey_object(oop obj); |
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1111 |
342 | 1112 public: |
1113 // It resets the task; it should be called right at the beginning of | |
1114 // a marking phase. | |
1115 void reset(CMBitMap* _nextMarkBitMap); | |
1116 // it clears all the fields that correspond to a claimed region. | |
1117 void clear_region_fields(); | |
1118 | |
1119 void set_concurrent(bool concurrent) { _concurrent = concurrent; } | |
1120 | |
1121 // The main method of this class which performs a marking step | |
1122 // trying not to exceed the given duration. However, it might exit | |
1123 // prematurely, according to some conditions (i.e. SATB buffers are | |
1124 // available for processing). | |
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1125 void do_marking_step(double target_ms, |
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1126 bool do_termination, |
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1127 bool is_serial); |
342 | 1128 |
1129 // These two calls start and stop the timer | |
1130 void record_start_time() { | |
1131 _elapsed_time_ms = os::elapsedTime() * 1000.0; | |
1132 } | |
1133 void record_end_time() { | |
1134 _elapsed_time_ms = os::elapsedTime() * 1000.0 - _elapsed_time_ms; | |
1135 } | |
1136 | |
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1137 // returns the worker ID associated with this task. |
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1138 uint worker_id() { return _worker_id; } |
342 | 1139 |
1140 // From TerminatorTerminator. It determines whether this task should | |
1141 // exit the termination protocol after it's entered it. | |
1142 virtual bool should_exit_termination(); | |
1143 | |
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1144 // Resets the local region fields after a task has finished scanning a |
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1145 // region; or when they have become stale as a result of the region |
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1146 // being evacuated. |
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1147 void giveup_current_region(); |
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1148 |
342 | 1149 HeapWord* finger() { return _finger; } |
1150 | |
1151 bool has_aborted() { return _has_aborted; } | |
1152 void set_has_aborted() { _has_aborted = true; } | |
1153 void clear_has_aborted() { _has_aborted = false; } | |
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1154 bool has_timed_out() { return _has_timed_out; } |
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1155 bool claimed() { return _claimed; } |
342 | 1156 |
3771 | 1157 void set_cm_oop_closure(G1CMOopClosure* cm_oop_closure); |
342 | 1158 |
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1159 // Increment the number of references this task has visited. |
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1160 void increment_refs_reached() { ++_refs_reached; } |
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1161 |
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1162 // Grey the object by marking it. If not already marked, push it on |
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1163 // the local queue if below the finger. |
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1164 // Precondition: obj is in region. |
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1165 // Precondition: obj is below region's NTAMS. |
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1166 inline void make_reference_grey(oop obj, HeapRegion* region); |
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1167 |
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1168 // Grey the object (by calling make_grey_reference) if required, |
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1169 // e.g. obj is below its containing region's NTAMS. |
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1170 // Precondition: obj is a valid heap object. |
3771 | 1171 inline void deal_with_reference(oop obj); |
342 | 1172 |
1173 // It scans an object and visits its children. | |
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1174 void scan_object(oop obj) { process_grey_object<true>(obj); } |
342 | 1175 |
1176 // It pushes an object on the local queue. | |
3771 | 1177 inline void push(oop obj); |
342 | 1178 |
1179 // These two move entries to/from the global stack. | |
1180 void move_entries_to_global_stack(); | |
1181 void get_entries_from_global_stack(); | |
1182 | |
1183 // It pops and scans objects from the local queue. If partially is | |
1184 // true, then it stops when the queue size is of a given limit. If | |
1185 // partially is false, then it stops when the queue is empty. | |
1186 void drain_local_queue(bool partially); | |
1187 // It moves entries from the global stack to the local queue and | |
1188 // drains the local queue. If partially is true, then it stops when | |
1189 // both the global stack and the local queue reach a given size. If | |
1190 // partially if false, it tries to empty them totally. | |
1191 void drain_global_stack(bool partially); | |
1192 // It keeps picking SATB buffers and processing them until no SATB | |
1193 // buffers are available. | |
1194 void drain_satb_buffers(); | |
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1195 |
342 | 1196 // moves the local finger to a new location |
1197 inline void move_finger_to(HeapWord* new_finger) { | |
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1198 assert(new_finger >= _finger && new_finger < _region_limit, "invariant"); |
342 | 1199 _finger = new_finger; |
1200 } | |
1201 | |
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1202 CMTask(uint worker_id, |
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1203 ConcurrentMark *cm, |
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1204 size_t* marked_bytes, |
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1205 BitMap* card_bm, |
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1206 CMTaskQueue* task_queue, |
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1207 CMTaskQueueSet* task_queues); |
342 | 1208 |
1209 // it prints statistics associated with this task | |
1210 void print_stats(); | |
1211 | |
1212 #if _MARKING_STATS_ | |
1213 void increase_objs_found_on_bitmap() { ++_objs_found_on_bitmap; } | |
1214 #endif // _MARKING_STATS_ | |
1215 }; | |
1972 | 1216 |
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1217 // Class that's used to to print out per-region liveness |
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1218 // information. It's currently used at the end of marking and also |
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1219 // after we sort the old regions at the end of the cleanup operation. |
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1220 class G1PrintRegionLivenessInfoClosure: public HeapRegionClosure { |
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1221 private: |
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1222 outputStream* _out; |
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1223 |
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1224 // Accumulators for these values. |
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1225 size_t _total_used_bytes; |
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1226 size_t _total_capacity_bytes; |
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1227 size_t _total_prev_live_bytes; |
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1228 size_t _total_next_live_bytes; |
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1229 |
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1230 // These are set up when we come across a "stars humongous" region |
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1231 // (as this is where most of this information is stored, not in the |
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1232 // subsequent "continues humongous" regions). After that, for every |
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1233 // region in a given humongous region series we deduce the right |
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1234 // values for it by simply subtracting the appropriate amount from |
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1235 // these fields. All these values should reach 0 after we've visited |
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1236 // the last region in the series. |
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1237 size_t _hum_used_bytes; |
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1238 size_t _hum_capacity_bytes; |
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1239 size_t _hum_prev_live_bytes; |
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1240 size_t _hum_next_live_bytes; |
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1241 |
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1242 // Accumulator for the remembered set size |
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1243 size_t _total_remset_bytes; |
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1244 |
12080 | 1245 // Accumulator for strong code roots memory size |
1246 size_t _total_strong_code_roots_bytes; | |
1247 | |
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1248 static double perc(size_t val, size_t total) { |
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1249 if (total == 0) { |
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1250 return 0.0; |
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1251 } else { |
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1252 return 100.0 * ((double) val / (double) total); |
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1253 } |
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1254 } |
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1255 |
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1256 static double bytes_to_mb(size_t val) { |
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1257 return (double) val / (double) M; |
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1258 } |
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1259 |
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1260 // See the .cpp file. |
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1261 size_t get_hum_bytes(size_t* hum_bytes); |
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1262 void get_hum_bytes(size_t* used_bytes, size_t* capacity_bytes, |
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1263 size_t* prev_live_bytes, size_t* next_live_bytes); |
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1264 |
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1265 public: |
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1266 // The header and footer are printed in the constructor and |
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1267 // destructor respectively. |
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1268 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name); |
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1269 virtual bool doHeapRegion(HeapRegion* r); |
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1270 ~G1PrintRegionLivenessInfoClosure(); |
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1271 }; |
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1272 |
1972 | 1273 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP |