Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/concurrentMark.hpp @ 13037:c8fc12209830
8027616: Off by one error in putback for compressed oops nashorn performance improvement
Summary: Should compare bounds greater than or equal 4G when deciding if shift is needed or CDS area + compressed class space are within 4G of each other.
Reviewed-by: stefank, hseigel, zgu
author | coleenp |
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date | Thu, 31 Oct 2013 14:11:02 -0400 |
parents | 5888334c9c24 |
children | 63a4eb8bcd23 58fc1b1523dc |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP | |
27 | |
2152 | 28 #include "gc_implementation/g1/heapRegionSets.hpp" |
1972 | 29 #include "utilities/taskqueue.hpp" |
30 | |
342 | 31 class G1CollectedHeap; |
32 class CMTask; | |
6197 | 33 typedef GenericTaskQueue<oop, mtGC> CMTaskQueue; |
34 typedef GenericTaskQueueSet<CMTaskQueue, mtGC> CMTaskQueueSet; | |
342 | 35 |
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36 // Closure used by CM during concurrent reference discovery |
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37 // and reference processing (during remarking) to determine |
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38 // if a particular object is alive. It is primarily used |
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39 // to determine if referents of discovered reference objects |
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40 // are alive. An instance is also embedded into the |
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41 // reference processor as the _is_alive_non_header field |
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42 class G1CMIsAliveClosure: public BoolObjectClosure { |
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43 G1CollectedHeap* _g1; |
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44 public: |
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45 G1CMIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) { } |
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46 |
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47 bool do_object_b(oop obj); |
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48 }; |
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49 |
342 | 50 // A generic CM bit map. This is essentially a wrapper around the BitMap |
51 // class, with one bit per (1<<_shifter) HeapWords. | |
52 | |
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53 class CMBitMapRO VALUE_OBJ_CLASS_SPEC { |
342 | 54 protected: |
55 HeapWord* _bmStartWord; // base address of range covered by map | |
56 size_t _bmWordSize; // map size (in #HeapWords covered) | |
57 const int _shifter; // map to char or bit | |
58 VirtualSpace _virtual_space; // underlying the bit map | |
59 BitMap _bm; // the bit map itself | |
60 | |
61 public: | |
62 // constructor | |
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63 CMBitMapRO(int shifter); |
342 | 64 |
65 enum { do_yield = true }; | |
66 | |
67 // inquiries | |
68 HeapWord* startWord() const { return _bmStartWord; } | |
69 size_t sizeInWords() const { return _bmWordSize; } | |
70 // the following is one past the last word in space | |
71 HeapWord* endWord() const { return _bmStartWord + _bmWordSize; } | |
72 | |
73 // read marks | |
74 | |
75 bool isMarked(HeapWord* addr) const { | |
76 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
77 "outside underlying space?"); | |
78 return _bm.at(heapWordToOffset(addr)); | |
79 } | |
80 | |
81 // iteration | |
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82 inline bool iterate(BitMapClosure* cl, MemRegion mr); |
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83 inline bool iterate(BitMapClosure* cl); |
342 | 84 |
85 // Return the address corresponding to the next marked bit at or after | |
86 // "addr", and before "limit", if "limit" is non-NULL. If there is no | |
87 // such bit, returns "limit" if that is non-NULL, or else "endWord()". | |
88 HeapWord* getNextMarkedWordAddress(HeapWord* addr, | |
89 HeapWord* limit = NULL) const; | |
90 // Return the address corresponding to the next unmarked 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* getNextUnmarkedWordAddress(HeapWord* addr, | |
94 HeapWord* limit = NULL) const; | |
95 | |
96 // conversion utilities | |
97 HeapWord* offsetToHeapWord(size_t offset) const { | |
98 return _bmStartWord + (offset << _shifter); | |
99 } | |
100 size_t heapWordToOffset(HeapWord* addr) const { | |
101 return pointer_delta(addr, _bmStartWord) >> _shifter; | |
102 } | |
103 int heapWordDiffToOffsetDiff(size_t diff) const; | |
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104 |
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105 // The argument addr should be the start address of a valid object |
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106 HeapWord* nextObject(HeapWord* addr) { |
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107 oop obj = (oop) addr; |
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108 HeapWord* res = addr + obj->size(); |
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109 assert(offsetToHeapWord(heapWordToOffset(res)) == res, "sanity"); |
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110 return res; |
342 | 111 } |
112 | |
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113 void print_on_error(outputStream* st, const char* prefix) const; |
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114 |
342 | 115 // debugging |
116 NOT_PRODUCT(bool covers(ReservedSpace rs) const;) | |
117 }; | |
118 | |
119 class CMBitMap : public CMBitMapRO { | |
120 | |
121 public: | |
122 // constructor | |
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123 CMBitMap(int shifter) : |
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124 CMBitMapRO(shifter) {} |
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125 |
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126 // Allocates the back store for the marking bitmap |
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127 bool allocate(ReservedSpace heap_rs); |
342 | 128 |
129 // write marks | |
130 void mark(HeapWord* addr) { | |
131 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
132 "outside underlying space?"); | |
3771 | 133 _bm.set_bit(heapWordToOffset(addr)); |
342 | 134 } |
135 void clear(HeapWord* addr) { | |
136 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
137 "outside underlying space?"); | |
3771 | 138 _bm.clear_bit(heapWordToOffset(addr)); |
342 | 139 } |
140 bool parMark(HeapWord* addr) { | |
141 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
142 "outside underlying space?"); | |
3771 | 143 return _bm.par_set_bit(heapWordToOffset(addr)); |
342 | 144 } |
145 bool parClear(HeapWord* addr) { | |
146 assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), | |
147 "outside underlying space?"); | |
3771 | 148 return _bm.par_clear_bit(heapWordToOffset(addr)); |
342 | 149 } |
150 void markRange(MemRegion mr); | |
151 void clearAll(); | |
152 void clearRange(MemRegion mr); | |
153 | |
154 // Starting at the bit corresponding to "addr" (inclusive), find the next | |
155 // "1" bit, if any. This bit starts some run of consecutive "1"'s; find | |
156 // the end of this run (stopping at "end_addr"). Return the MemRegion | |
157 // covering from the start of the region corresponding to the first bit | |
158 // of the run to the end of the region corresponding to the last bit of | |
159 // the run. If there is no "1" bit at or after "addr", return an empty | |
160 // MemRegion. | |
161 MemRegion getAndClearMarkedRegion(HeapWord* addr, HeapWord* end_addr); | |
162 }; | |
163 | |
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164 // Represents a marking stack used by ConcurrentMarking in the G1 collector. |
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165 class CMMarkStack VALUE_OBJ_CLASS_SPEC { |
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166 VirtualSpace _virtual_space; // Underlying backing store for actual stack |
342 | 167 ConcurrentMark* _cm; |
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168 oop* _base; // bottom of stack |
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169 jint _index; // one more than last occupied index |
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170 jint _capacity; // max #elements |
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171 jint _saved_index; // value of _index saved at start of GC |
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172 NOT_PRODUCT(jint _max_depth;) // max depth plumbed during run |
342 | 173 |
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174 bool _overflow; |
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175 bool _should_expand; |
342 | 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 | |
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183 #ifndef PRODUCT |
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184 jint max_depth() const { |
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185 return _max_depth; |
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186 } |
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187 #endif |
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188 |
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189 bool allocate(size_t capacity); |
342 | 190 |
191 oop pop() { | |
192 if (!isEmpty()) { | |
193 return _base[--_index] ; | |
194 } | |
195 return NULL; | |
196 } | |
197 | |
198 // If overflow happens, don't do the push, and record the overflow. | |
199 // *Requires* that "ptr" is already marked. | |
200 void push(oop ptr) { | |
201 if (isFull()) { | |
202 // Record overflow. | |
203 _overflow = true; | |
204 return; | |
205 } else { | |
206 _base[_index++] = ptr; | |
207 NOT_PRODUCT(_max_depth = MAX2(_max_depth, _index)); | |
208 } | |
209 } | |
210 // Non-block impl. Note: concurrency is allowed only with other | |
211 // "par_push" operations, not with "pop" or "drain". We would need | |
212 // parallel versions of them if such concurrency was desired. | |
213 void par_push(oop ptr); | |
214 | |
215 // Pushes the first "n" elements of "ptr_arr" on the stack. | |
216 // Non-block impl. Note: concurrency is allowed only with other | |
217 // "par_adjoin_arr" or "push" operations, not with "pop" or "drain". | |
218 void par_adjoin_arr(oop* ptr_arr, int n); | |
219 | |
220 // Pushes the first "n" elements of "ptr_arr" on the stack. | |
221 // Locking impl: concurrency is allowed only with | |
222 // "par_push_arr" and/or "par_pop_arr" operations, which use the same | |
223 // locking strategy. | |
224 void par_push_arr(oop* ptr_arr, int n); | |
225 | |
226 // If returns false, the array was empty. Otherwise, removes up to "max" | |
227 // elements from the stack, and transfers them to "ptr_arr" in an | |
228 // unspecified order. The actual number transferred is given in "n" ("n | |
229 // == 0" is deliberately redundant with the return value.) Locking impl: | |
230 // concurrency is allowed only with "par_push_arr" and/or "par_pop_arr" | |
231 // operations, which use the same locking strategy. | |
232 bool par_pop_arr(oop* ptr_arr, int max, int* n); | |
233 | |
234 // Drain the mark stack, applying the given closure to all fields of | |
235 // objects on the stack. (That is, continue until the stack is empty, | |
236 // even if closure applications add entries to the stack.) The "bm" | |
237 // argument, if non-null, may be used to verify that only marked objects | |
238 // are on the mark stack. If "yield_after" is "true", then the | |
239 // concurrent marker performing the drain offers to yield after | |
240 // processing each object. If a yield occurs, stops the drain operation | |
241 // and returns false. Otherwise, returns true. | |
242 template<class OopClosureClass> | |
243 bool drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after = false); | |
244 | |
245 bool isEmpty() { return _index == 0; } | |
246 bool isFull() { return _index == _capacity; } | |
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247 int maxElems() { return _capacity; } |
342 | 248 |
249 bool overflow() { return _overflow; } | |
250 void clear_overflow() { _overflow = false; } | |
251 | |
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252 bool should_expand() const { return _should_expand; } |
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253 void set_should_expand(); |
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254 |
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255 // Expand the stack, typically in response to an overflow condition |
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256 void expand(); |
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257 |
342 | 258 int size() { return _index; } |
259 | |
260 void setEmpty() { _index = 0; clear_overflow(); } | |
261 | |
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262 // Record the current index. |
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263 void note_start_of_gc(); |
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264 |
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265 // Make sure that we have not added any entries to the stack during GC. |
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266 void note_end_of_gc(); |
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267 |
342 | 268 // iterate over the oops in the mark stack, up to the bound recorded via |
269 // the call above. | |
270 void oops_do(OopClosure* f); | |
271 }; | |
272 | |
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273 class ForceOverflowSettings VALUE_OBJ_CLASS_SPEC { |
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274 private: |
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275 #ifndef PRODUCT |
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276 uintx _num_remaining; |
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277 bool _force; |
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278 #endif // !defined(PRODUCT) |
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279 |
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280 public: |
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281 void init() PRODUCT_RETURN; |
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282 void update() PRODUCT_RETURN; |
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283 bool should_force() PRODUCT_RETURN_( return false; ); |
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284 }; |
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285 |
342 | 286 // this will enable a variety of different statistics per GC task |
287 #define _MARKING_STATS_ 0 | |
288 // this will enable the higher verbose levels | |
289 #define _MARKING_VERBOSE_ 0 | |
290 | |
291 #if _MARKING_STATS_ | |
292 #define statsOnly(statement) \ | |
293 do { \ | |
294 statement ; \ | |
295 } while (0) | |
296 #else // _MARKING_STATS_ | |
297 #define statsOnly(statement) \ | |
298 do { \ | |
299 } while (0) | |
300 #endif // _MARKING_STATS_ | |
301 | |
302 typedef enum { | |
303 no_verbose = 0, // verbose turned off | |
304 stats_verbose, // only prints stats at the end of marking | |
305 low_verbose, // low verbose, mostly per region and per major event | |
306 medium_verbose, // a bit more detailed than low | |
307 high_verbose // per object verbose | |
308 } CMVerboseLevel; | |
309 | |
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310 class YoungList; |
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311 |
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312 // Root Regions are regions that are not empty at the beginning of a |
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313 // marking cycle and which we might collect during an evacuation pause |
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314 // while the cycle is active. Given that, during evacuation pauses, we |
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315 // do not copy objects that are explicitly marked, what we have to do |
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316 // for the root regions is to scan them and mark all objects reachable |
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317 // from them. According to the SATB assumptions, we only need to visit |
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318 // each object once during marking. So, as long as we finish this scan |
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319 // before the next evacuation pause, we can copy the objects from the |
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320 // root regions without having to mark them or do anything else to them. |
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321 // |
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322 // Currently, we only support root region scanning once (at the start |
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323 // of the marking cycle) and the root regions are all the survivor |
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324 // regions populated during the initial-mark pause. |
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325 class CMRootRegions VALUE_OBJ_CLASS_SPEC { |
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326 private: |
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327 YoungList* _young_list; |
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328 ConcurrentMark* _cm; |
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329 |
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330 volatile bool _scan_in_progress; |
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331 volatile bool _should_abort; |
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332 HeapRegion* volatile _next_survivor; |
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333 |
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334 public: |
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335 CMRootRegions(); |
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336 // We actually do most of the initialization in this method. |
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337 void init(G1CollectedHeap* g1h, ConcurrentMark* cm); |
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338 |
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339 // Reset the claiming / scanning of the root regions. |
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340 void prepare_for_scan(); |
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341 |
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342 // Forces get_next() to return NULL so that the iteration aborts early. |
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343 void abort() { _should_abort = true; } |
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344 |
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345 // Return true if the CM thread are actively scanning root regions, |
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346 // false otherwise. |
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347 bool scan_in_progress() { return _scan_in_progress; } |
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348 |
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349 // Claim the next root region to scan atomically, or return NULL if |
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350 // all have been claimed. |
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351 HeapRegion* claim_next(); |
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352 |
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353 // Flag that we're done with root region scanning and notify anyone |
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354 // who's waiting on it. If aborted is false, assume that all regions |
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355 // have been claimed. |
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356 void scan_finished(); |
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357 |
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358 // If CM threads are still scanning root regions, wait until they |
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359 // are done. Return true if we had to wait, false otherwise. |
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360 bool wait_until_scan_finished(); |
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361 }; |
342 | 362 |
363 class ConcurrentMarkThread; | |
364 | |
6197 | 365 class ConcurrentMark: public CHeapObj<mtGC> { |
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366 friend class CMMarkStack; |
342 | 367 friend class ConcurrentMarkThread; |
368 friend class CMTask; | |
369 friend class CMBitMapClosure; | |
370 friend class CMGlobalObjectClosure; | |
371 friend class CMRemarkTask; | |
372 friend class CMConcurrentMarkingTask; | |
373 friend class G1ParNoteEndTask; | |
374 friend class CalcLiveObjectsClosure; | |
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375 friend class G1CMRefProcTaskProxy; |
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376 friend class G1CMRefProcTaskExecutor; |
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377 friend class G1CMKeepAliveAndDrainClosure; |
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378 friend class G1CMDrainMarkingStackClosure; |
342 | 379 |
380 protected: | |
381 ConcurrentMarkThread* _cmThread; // the thread doing the work | |
382 G1CollectedHeap* _g1h; // the heap. | |
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383 uint _parallel_marking_threads; // the number of marking |
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384 // threads we're use |
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385 uint _max_parallel_marking_threads; // max number of marking |
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386 // threads we'll ever use |
342 | 387 double _sleep_factor; // how much we have to sleep, with |
388 // respect to the work we just did, to | |
389 // meet the marking overhead goal | |
390 double _marking_task_overhead; // marking target overhead for | |
391 // a single task | |
392 | |
393 // same as the two above, but for the cleanup task | |
394 double _cleanup_sleep_factor; | |
395 double _cleanup_task_overhead; | |
396 | |
2152 | 397 FreeRegionList _cleanup_list; |
342 | 398 |
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399 // Concurrent marking support structures |
342 | 400 CMBitMap _markBitMap1; |
401 CMBitMap _markBitMap2; | |
402 CMBitMapRO* _prevMarkBitMap; // completed mark bitmap | |
403 CMBitMap* _nextMarkBitMap; // under-construction mark bitmap | |
404 | |
405 BitMap _region_bm; | |
406 BitMap _card_bm; | |
407 | |
408 // Heap bounds | |
409 HeapWord* _heap_start; | |
410 HeapWord* _heap_end; | |
411 | |
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412 // Root region tracking and claiming. |
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413 CMRootRegions _root_regions; |
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414 |
342 | 415 // For gray objects |
416 CMMarkStack _markStack; // Grey objects behind global finger. | |
417 HeapWord* volatile _finger; // the global finger, region aligned, | |
418 // always points to the end of the | |
419 // last claimed region | |
420 | |
421 // marking tasks | |
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422 uint _max_worker_id;// maximum worker id |
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423 uint _active_tasks; // task num currently active |
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424 CMTask** _tasks; // task queue array (max_worker_id len) |
342 | 425 CMTaskQueueSet* _task_queues; // task queue set |
426 ParallelTaskTerminator _terminator; // for termination | |
427 | |
428 // Two sync barriers that are used to synchronise tasks when an | |
429 // overflow occurs. The algorithm is the following. All tasks enter | |
430 // the first one to ensure that they have all stopped manipulating | |
431 // the global data structures. After they exit it, they re-initialise | |
432 // their data structures and task 0 re-initialises the global data | |
433 // structures. Then, they enter the second sync barrier. This | |
434 // ensure, that no task starts doing work before all data | |
435 // structures (local and global) have been re-initialised. When they | |
436 // exit it, they are free to start working again. | |
437 WorkGangBarrierSync _first_overflow_barrier_sync; | |
438 WorkGangBarrierSync _second_overflow_barrier_sync; | |
439 | |
440 // this is set by any task, when an overflow on the global data | |
441 // structures is detected. | |
442 volatile bool _has_overflown; | |
443 // true: marking is concurrent, false: we're in remark | |
444 volatile bool _concurrent; | |
445 // set at the end of a Full GC so that marking aborts | |
446 volatile bool _has_aborted; | |
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447 |
342 | 448 // used when remark aborts due to an overflow to indicate that |
449 // another concurrent marking phase should start | |
450 volatile bool _restart_for_overflow; | |
451 | |
452 // This is true from the very start of concurrent marking until the | |
453 // point when all the tasks complete their work. It is really used | |
454 // to determine the points between the end of concurrent marking and | |
455 // time of remark. | |
456 volatile bool _concurrent_marking_in_progress; | |
457 | |
458 // verbose level | |
459 CMVerboseLevel _verbose_level; | |
460 | |
461 // All of these times are in ms. | |
462 NumberSeq _init_times; | |
463 NumberSeq _remark_times; | |
464 NumberSeq _remark_mark_times; | |
465 NumberSeq _remark_weak_ref_times; | |
466 NumberSeq _cleanup_times; | |
467 double _total_counting_time; | |
468 double _total_rs_scrub_time; | |
469 | |
470 double* _accum_task_vtime; // accumulated task vtime | |
471 | |
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472 FlexibleWorkGang* _parallel_workers; |
342 | 473 |
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474 ForceOverflowSettings _force_overflow_conc; |
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475 ForceOverflowSettings _force_overflow_stw; |
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476 |
342 | 477 void weakRefsWork(bool clear_all_soft_refs); |
478 | |
479 void swapMarkBitMaps(); | |
480 | |
481 // It resets the global marking data structures, as well as the | |
482 // task local ones; should be called during initial mark. | |
483 void reset(); | |
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484 |
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485 // Resets all the marking data structures. Called when we have to restart |
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486 // marking or when marking completes (via set_non_marking_state below). |
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487 void reset_marking_state(bool clear_overflow = true); |
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488 |
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489 // We do this after we're done with marking so that the marking data |
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490 // structures are initialised to a sensible and predictable state. |
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491 void set_non_marking_state(); |
342 | 492 |
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493 // Called to indicate how many threads are currently active. |
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494 void set_concurrency(uint active_tasks); |
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495 |
342 | 496 // It should be called to indicate which phase we're in (concurrent |
497 // mark or remark) and how many threads are currently active. | |
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498 void set_concurrency_and_phase(uint active_tasks, bool concurrent); |
342 | 499 |
500 // prints all gathered CM-related statistics | |
501 void print_stats(); | |
502 | |
2152 | 503 bool cleanup_list_is_empty() { |
504 return _cleanup_list.is_empty(); | |
505 } | |
506 | |
342 | 507 // accessor methods |
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508 uint parallel_marking_threads() const { return _parallel_marking_threads; } |
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509 uint max_parallel_marking_threads() const { return _max_parallel_marking_threads;} |
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510 double sleep_factor() { return _sleep_factor; } |
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511 double marking_task_overhead() { return _marking_task_overhead;} |
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512 double cleanup_sleep_factor() { return _cleanup_sleep_factor; } |
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513 double cleanup_task_overhead() { return _cleanup_task_overhead;} |
342 | 514 |
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515 bool use_parallel_marking_threads() const { |
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516 assert(parallel_marking_threads() <= |
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517 max_parallel_marking_threads(), "sanity"); |
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518 assert((_parallel_workers == NULL && parallel_marking_threads() == 0) || |
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519 parallel_marking_threads() > 0, |
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520 "parallel workers not set up correctly"); |
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521 return _parallel_workers != NULL; |
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522 } |
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523 |
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524 HeapWord* finger() { return _finger; } |
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525 bool concurrent() { return _concurrent; } |
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526 uint active_tasks() { return _active_tasks; } |
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527 ParallelTaskTerminator* terminator() { return &_terminator; } |
342 | 528 |
529 // It claims the next available region to be scanned by a marking | |
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530 // task/thread. It might return NULL if the next region is empty or |
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531 // we have run out of regions. In the latter case, out_of_regions() |
342 | 532 // determines whether we've really run out of regions or the task |
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533 // should call claim_region() again. This might seem a bit |
342 | 534 // awkward. Originally, the code was written so that claim_region() |
535 // either successfully returned with a non-empty region or there | |
536 // were no more regions to be claimed. The problem with this was | |
537 // that, in certain circumstances, it iterated over large chunks of | |
538 // the heap finding only empty regions and, while it was working, it | |
539 // was preventing the calling task to call its regular clock | |
540 // method. So, this way, each task will spend very little time in | |
541 // claim_region() and is allowed to call the regular clock method | |
542 // frequently. | |
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543 HeapRegion* claim_region(uint worker_id); |
342 | 544 |
545 // It determines whether we've run out of regions to scan. | |
546 bool out_of_regions() { return _finger == _heap_end; } | |
547 | |
548 // Returns the task with the given id | |
549 CMTask* task(int id) { | |
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550 assert(0 <= id && id < (int) _active_tasks, |
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551 "task id not within active bounds"); |
342 | 552 return _tasks[id]; |
553 } | |
554 | |
555 // Returns the task queue with the given id | |
556 CMTaskQueue* task_queue(int id) { | |
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557 assert(0 <= id && id < (int) _active_tasks, |
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558 "task queue id not within active bounds"); |
342 | 559 return (CMTaskQueue*) _task_queues->queue(id); |
560 } | |
561 | |
562 // Returns the task queue set | |
563 CMTaskQueueSet* task_queues() { return _task_queues; } | |
564 | |
565 // Access / manipulation of the overflow flag which is set to | |
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566 // indicate that the global stack has overflown |
342 | 567 bool has_overflown() { return _has_overflown; } |
568 void set_has_overflown() { _has_overflown = true; } | |
569 void clear_has_overflown() { _has_overflown = false; } | |
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570 bool restart_for_overflow() { return _restart_for_overflow; } |
342 | 571 |
572 // Methods to enter the two overflow sync barriers | |
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573 void enter_first_sync_barrier(uint worker_id); |
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574 void enter_second_sync_barrier(uint worker_id); |
342 | 575 |
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576 ForceOverflowSettings* force_overflow_conc() { |
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577 return &_force_overflow_conc; |
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578 } |
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579 |
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580 ForceOverflowSettings* force_overflow_stw() { |
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581 return &_force_overflow_stw; |
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582 } |
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583 |
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584 ForceOverflowSettings* force_overflow() { |
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585 if (concurrent()) { |
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586 return force_overflow_conc(); |
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587 } else { |
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588 return force_overflow_stw(); |
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589 } |
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590 } |
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591 |
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592 // Live Data Counting data structures... |
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593 // These data structures are initialized at the start of |
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594 // marking. They are written to while marking is active. |
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595 // They are aggregated during remark; the aggregated values |
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596 // are then used to populate the _region_bm, _card_bm, and |
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597 // the total live bytes, which are then subsequently updated |
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598 // during cleanup. |
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599 |
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600 // An array of bitmaps (one bit map per task). Each bitmap |
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601 // is used to record the cards spanned by the live objects |
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602 // marked by that task/worker. |
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603 BitMap* _count_card_bitmaps; |
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604 |
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605 // Used to record the number of marked live bytes |
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606 // (for each region, by worker thread). |
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607 size_t** _count_marked_bytes; |
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608 |
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609 // Card index of the bottom of the G1 heap. Used for biasing indices into |
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610 // the card bitmaps. |
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611 intptr_t _heap_bottom_card_num; |
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612 |
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613 // Set to true when initialization is complete |
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614 bool _completed_initialization; |
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615 |
342 | 616 public: |
617 // Manipulation of the global mark stack. | |
618 // Notice that the first mark_stack_push is CAS-based, whereas the | |
619 // two below are Mutex-based. This is OK since the first one is only | |
620 // called during evacuation pauses and doesn't compete with the | |
621 // other two (which are called by the marking tasks during | |
622 // concurrent marking or remark). | |
623 bool mark_stack_push(oop p) { | |
624 _markStack.par_push(p); | |
625 if (_markStack.overflow()) { | |
626 set_has_overflown(); | |
627 return false; | |
628 } | |
629 return true; | |
630 } | |
631 bool mark_stack_push(oop* arr, int n) { | |
632 _markStack.par_push_arr(arr, n); | |
633 if (_markStack.overflow()) { | |
634 set_has_overflown(); | |
635 return false; | |
636 } | |
637 return true; | |
638 } | |
639 void mark_stack_pop(oop* arr, int max, int* n) { | |
640 _markStack.par_pop_arr(arr, max, n); | |
641 } | |
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642 size_t mark_stack_size() { return _markStack.size(); } |
342 | 643 size_t partial_mark_stack_size_target() { return _markStack.maxElems()/3; } |
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644 bool mark_stack_overflow() { return _markStack.overflow(); } |
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645 bool mark_stack_empty() { return _markStack.isEmpty(); } |
342 | 646 |
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647 CMRootRegions* root_regions() { return &_root_regions; } |
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648 |
342 | 649 bool concurrent_marking_in_progress() { |
650 return _concurrent_marking_in_progress; | |
651 } | |
652 void set_concurrent_marking_in_progress() { | |
653 _concurrent_marking_in_progress = true; | |
654 } | |
655 void clear_concurrent_marking_in_progress() { | |
656 _concurrent_marking_in_progress = false; | |
657 } | |
658 | |
659 void update_accum_task_vtime(int i, double vtime) { | |
660 _accum_task_vtime[i] += vtime; | |
661 } | |
662 | |
663 double all_task_accum_vtime() { | |
664 double ret = 0.0; | |
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665 for (uint i = 0; i < _max_worker_id; ++i) |
342 | 666 ret += _accum_task_vtime[i]; |
667 return ret; | |
668 } | |
669 | |
670 // Attempts to steal an object from the task queues of other tasks | |
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671 bool try_stealing(uint worker_id, int* hash_seed, oop& obj) { |
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672 return _task_queues->steal(worker_id, hash_seed, obj); |
342 | 673 } |
674 | |
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675 ConcurrentMark(G1CollectedHeap* g1h, ReservedSpace heap_rs); |
342 | 676 ~ConcurrentMark(); |
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677 |
342 | 678 ConcurrentMarkThread* cmThread() { return _cmThread; } |
679 | |
680 CMBitMapRO* prevMarkBitMap() const { return _prevMarkBitMap; } | |
681 CMBitMap* nextMarkBitMap() const { return _nextMarkBitMap; } | |
682 | |
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683 // Returns the number of GC threads to be used in a concurrent |
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684 // phase based on the number of GC threads being used in a STW |
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685 // phase. |
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686 uint scale_parallel_threads(uint n_par_threads); |
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687 |
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688 // Calculates the number of GC threads to be used in a concurrent phase. |
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689 uint calc_parallel_marking_threads(); |
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690 |
342 | 691 // The following three are interaction between CM and |
692 // G1CollectedHeap | |
693 | |
694 // This notifies CM that a root during initial-mark needs to be | |
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695 // grayed. It is MT-safe. word_size is the size of the object in |
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696 // words. It is passed explicitly as sometimes we cannot calculate |
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697 // it from the given object because it might be in an inconsistent |
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698 // state (e.g., in to-space and being copied). So the caller is |
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699 // responsible for dealing with this issue (e.g., get the size from |
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700 // the from-space image when the to-space image might be |
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701 // inconsistent) and always passing the size. hr is the region that |
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702 // contains the object and it's passed optionally from callers who |
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703 // might already have it (no point in recalculating it). |
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704 inline void grayRoot(oop obj, size_t word_size, |
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705 uint worker_id, HeapRegion* hr = NULL); |
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706 |
1388 | 707 // It iterates over the heap and for each object it comes across it |
708 // will dump the contents of its reference fields, as well as | |
709 // liveness information for the object and its referents. The dump | |
710 // will be written to a file with the following name: | |
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711 // G1PrintReachableBaseFile + "." + str. |
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712 // vo decides whether the prev (vo == UsePrevMarking), the next |
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713 // (vo == UseNextMarking) marking information, or the mark word |
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714 // (vo == UseMarkWord) will be used to determine the liveness of |
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715 // each object / referent. |
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716 // If all is true, all objects in the heap will be dumped, otherwise |
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717 // only the live ones. In the dump the following symbols / breviations |
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718 // are used: |
1388 | 719 // M : an explicitly live object (its bitmap bit is set) |
720 // > : an implicitly live object (over tams) | |
721 // O : an object outside the G1 heap (typically: in the perm gen) | |
722 // NOT : a reference field whose referent is not live | |
723 // AND MARKED : indicates that an object is both explicitly and | |
724 // implicitly live (it should be one or the other, not both) | |
725 void print_reachable(const char* str, | |
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726 VerifyOption vo, bool all) PRODUCT_RETURN; |
342 | 727 |
728 // Clear the next marking bitmap (will be called concurrently). | |
729 void clearNextBitmap(); | |
730 | |
731 // These two do the work that needs to be done before and after the | |
732 // initial root checkpoint. Since this checkpoint can be done at two | |
733 // different points (i.e. an explicit pause or piggy-backed on a | |
734 // young collection), then it's nice to be able to easily share the | |
735 // pre/post code. It might be the case that we can put everything in | |
736 // the post method. TP | |
737 void checkpointRootsInitialPre(); | |
738 void checkpointRootsInitialPost(); | |
739 | |
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740 // Scan all the root regions and mark everything reachable from |
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741 // them. |
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742 void scanRootRegions(); |
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743 |
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744 // Scan a single root region and mark everything reachable from it. |
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745 void scanRootRegion(HeapRegion* hr, uint worker_id); |
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746 |
342 | 747 // Do concurrent phase of marking, to a tentative transitive closure. |
748 void markFromRoots(); | |
749 | |
750 void checkpointRootsFinal(bool clear_all_soft_refs); | |
751 void checkpointRootsFinalWork(); | |
752 void cleanup(); | |
753 void completeCleanup(); | |
754 | |
755 // Mark in the previous bitmap. NB: this is usually read-only, so use | |
756 // this carefully! | |
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757 inline void markPrev(oop p); |
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758 |
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759 // Clears marks for all objects in the given range, for the prev, |
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760 // next, or both bitmaps. NB: the previous bitmap is usually |
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761 // read-only, so use this carefully! |
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762 void clearRangePrevBitmap(MemRegion mr); |
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763 void clearRangeNextBitmap(MemRegion mr); |
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764 void clearRangeBothBitmaps(MemRegion mr); |
342 | 765 |
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766 // Notify data structures that a GC has started. |
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767 void note_start_of_gc() { |
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768 _markStack.note_start_of_gc(); |
342 | 769 } |
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770 |
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771 // Notify data structures that a GC is finished. |
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772 void note_end_of_gc() { |
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773 _markStack.note_end_of_gc(); |
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774 } |
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775 |
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776 // Verify that there are no CSet oops on the stacks (taskqueues / |
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777 // global mark stack), enqueued SATB buffers, per-thread SATB |
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778 // buffers, and fingers (global / per-task). The boolean parameters |
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779 // decide which of the above data structures to verify. If marking |
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780 // is not in progress, it's a no-op. |
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781 void verify_no_cset_oops(bool verify_stacks, |
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782 bool verify_enqueued_buffers, |
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783 bool verify_thread_buffers, |
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784 bool verify_fingers) PRODUCT_RETURN; |
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785 |
342 | 786 // It is called at the end of an evacuation pause during marking so |
787 // that CM is notified of where the new end of the heap is. It | |
788 // doesn't do anything if concurrent_marking_in_progress() is false, | |
789 // unless the force parameter is true. | |
790 void update_g1_committed(bool force = false); | |
791 | |
792 bool isMarked(oop p) const { | |
793 assert(p != NULL && p->is_oop(), "expected an oop"); | |
794 HeapWord* addr = (HeapWord*)p; | |
795 assert(addr >= _nextMarkBitMap->startWord() || | |
796 addr < _nextMarkBitMap->endWord(), "in a region"); | |
797 | |
798 return _nextMarkBitMap->isMarked(addr); | |
799 } | |
800 | |
801 inline bool not_yet_marked(oop p) const; | |
802 | |
803 // XXX Debug code | |
804 bool containing_card_is_marked(void* p); | |
805 bool containing_cards_are_marked(void* start, void* last); | |
806 | |
807 bool isPrevMarked(oop p) const { | |
808 assert(p != NULL && p->is_oop(), "expected an oop"); | |
809 HeapWord* addr = (HeapWord*)p; | |
810 assert(addr >= _prevMarkBitMap->startWord() || | |
811 addr < _prevMarkBitMap->endWord(), "in a region"); | |
812 | |
813 return _prevMarkBitMap->isMarked(addr); | |
814 } | |
815 | |
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816 inline bool do_yield_check(uint worker_i = 0); |
342 | 817 inline bool should_yield(); |
818 | |
819 // Called to abort the marking cycle after a Full GC takes palce. | |
820 void abort(); | |
821 | |
10405 | 822 bool has_aborted() { return _has_aborted; } |
823 | |
342 | 824 // This prints the global/local fingers. It is used for debugging. |
825 NOT_PRODUCT(void print_finger();) | |
826 | |
827 void print_summary_info(); | |
828 | |
1019 | 829 void print_worker_threads_on(outputStream* st) const; |
830 | |
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831 void print_on_error(outputStream* st) const; |
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832 |
342 | 833 // The following indicate whether a given verbose level has been |
834 // set. Notice that anything above stats is conditional to | |
835 // _MARKING_VERBOSE_ having been set to 1 | |
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836 bool verbose_stats() { |
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837 return _verbose_level >= stats_verbose; |
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838 } |
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839 bool verbose_low() { |
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840 return _MARKING_VERBOSE_ && _verbose_level >= low_verbose; |
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841 } |
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842 bool verbose_medium() { |
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843 return _MARKING_VERBOSE_ && _verbose_level >= medium_verbose; |
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844 } |
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845 bool verbose_high() { |
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846 return _MARKING_VERBOSE_ && _verbose_level >= high_verbose; |
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847 } |
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848 |
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849 // Liveness counting |
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850 |
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851 // Utility routine to set an exclusive range of cards on the given |
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852 // card liveness bitmap |
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853 inline void set_card_bitmap_range(BitMap* card_bm, |
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854 BitMap::idx_t start_idx, |
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855 BitMap::idx_t end_idx, |
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856 bool is_par); |
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857 |
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858 // Returns the card number of the bottom of the G1 heap. |
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859 // Used in biasing indices into accounting card bitmaps. |
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860 intptr_t heap_bottom_card_num() const { |
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861 return _heap_bottom_card_num; |
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862 } |
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863 |
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864 // Returns the card bitmap for a given task or worker id. |
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865 BitMap* count_card_bitmap_for(uint worker_id) { |
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866 assert(0 <= worker_id && worker_id < _max_worker_id, "oob"); |
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867 assert(_count_card_bitmaps != NULL, "uninitialized"); |
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868 BitMap* task_card_bm = &_count_card_bitmaps[worker_id]; |
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869 assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
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870 return task_card_bm; |
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871 } |
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872 |
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873 // Returns the array containing the marked bytes for each region, |
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874 // for the given worker or task id. |
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875 size_t* count_marked_bytes_array_for(uint worker_id) { |
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876 assert(0 <= worker_id && worker_id < _max_worker_id, "oob"); |
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877 assert(_count_marked_bytes != NULL, "uninitialized"); |
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878 size_t* marked_bytes_array = _count_marked_bytes[worker_id]; |
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879 assert(marked_bytes_array != NULL, "uninitialized"); |
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880 return marked_bytes_array; |
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881 } |
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882 |
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883 // Returns the index in the liveness accounting card table bitmap |
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884 // for the given address |
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885 inline BitMap::idx_t card_bitmap_index_for(HeapWord* addr); |
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886 |
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887 // Counts the size of the given memory region in the the given |
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888 // marked_bytes array slot for the given HeapRegion. |
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889 // Sets the bits in the given card bitmap that are associated with the |
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890 // cards that are spanned by the memory region. |
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891 inline void count_region(MemRegion mr, HeapRegion* hr, |
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892 size_t* marked_bytes_array, |
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893 BitMap* task_card_bm); |
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894 |
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895 // Counts the given memory region in the task/worker counting |
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896 // data structures for the given worker id. |
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897 inline void count_region(MemRegion mr, HeapRegion* hr, uint worker_id); |
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898 |
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899 // Counts the given memory region in the task/worker counting |
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900 // data structures for the given worker id. |
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901 inline void count_region(MemRegion mr, uint worker_id); |
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902 |
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903 // Counts the given object in the given task/worker counting |
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904 // data structures. |
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905 inline void count_object(oop obj, HeapRegion* hr, |
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906 size_t* marked_bytes_array, |
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907 BitMap* task_card_bm); |
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908 |
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909 // Counts the given object in the task/worker counting data |
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910 // structures for the given worker id. |
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911 inline void count_object(oop obj, HeapRegion* hr, uint worker_id); |
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912 |
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913 // Attempts to mark the given object and, if successful, counts |
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914 // the object in the given task/worker counting structures. |
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915 inline bool par_mark_and_count(oop obj, HeapRegion* hr, |
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916 size_t* marked_bytes_array, |
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917 BitMap* task_card_bm); |
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918 |
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919 // Attempts to mark the given object and, if successful, counts |
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920 // the object in the task/worker counting structures for the |
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921 // given worker id. |
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922 inline bool par_mark_and_count(oop obj, size_t word_size, |
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923 HeapRegion* hr, uint worker_id); |
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924 |
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925 // Attempts to mark the given object and, if successful, counts |
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926 // the object in the task/worker counting structures for the |
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927 // given worker id. |
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928 inline bool par_mark_and_count(oop obj, HeapRegion* hr, uint worker_id); |
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929 |
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930 // Similar to the above routine but we don't know the heap region that |
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931 // contains the object to be marked/counted, which this routine looks up. |
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932 inline bool par_mark_and_count(oop obj, uint worker_id); |
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933 |
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934 // Similar to the above routine but there are times when we cannot |
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935 // safely calculate the size of obj due to races and we, therefore, |
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936 // pass the size in as a parameter. It is the caller's reponsibility |
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937 // to ensure that the size passed in for obj is valid. |
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938 inline bool par_mark_and_count(oop obj, size_t word_size, uint worker_id); |
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939 |
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940 // Unconditionally mark the given object, and unconditinally count |
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941 // the object in the counting structures for worker id 0. |
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942 // Should *not* be called from parallel code. |
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943 inline bool mark_and_count(oop obj, HeapRegion* hr); |
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944 |
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945 // Similar to the above routine but we don't know the heap region that |
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946 // contains the object to be marked/counted, which this routine looks up. |
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947 // Should *not* be called from parallel code. |
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948 inline bool mark_and_count(oop obj); |
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949 |
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950 // Returns true if initialization was successfully completed. |
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951 bool completed_initialization() const { |
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952 return _completed_initialization; |
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953 } |
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954 |
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955 protected: |
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956 // Clear all the per-task bitmaps and arrays used to store the |
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957 // counting data. |
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958 void clear_all_count_data(); |
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959 |
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960 // Aggregates the counting data for each worker/task |
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961 // that was constructed while marking. Also sets |
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962 // the amount of marked bytes for each region and |
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963 // the top at concurrent mark count. |
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964 void aggregate_count_data(); |
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965 |
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966 // Verification routine |
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967 void verify_count_data(); |
342 | 968 }; |
969 | |
970 // A class representing a marking task. | |
971 class CMTask : public TerminatorTerminator { | |
972 private: | |
973 enum PrivateConstants { | |
974 // the regular clock call is called once the scanned words reaches | |
975 // this limit | |
976 words_scanned_period = 12*1024, | |
977 // the regular clock call is called once the number of visited | |
978 // references reaches this limit | |
979 refs_reached_period = 384, | |
980 // initial value for the hash seed, used in the work stealing code | |
981 init_hash_seed = 17, | |
982 // how many entries will be transferred between global stack and | |
983 // local queues | |
984 global_stack_transfer_size = 16 | |
985 }; | |
986 | |
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987 uint _worker_id; |
342 | 988 G1CollectedHeap* _g1h; |
989 ConcurrentMark* _cm; | |
990 CMBitMap* _nextMarkBitMap; | |
991 // the task queue of this task | |
992 CMTaskQueue* _task_queue; | |
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993 private: |
342 | 994 // the task queue set---needed for stealing |
995 CMTaskQueueSet* _task_queues; | |
996 // indicates whether the task has been claimed---this is only for | |
997 // debugging purposes | |
998 bool _claimed; | |
999 | |
1000 // number of calls to this task | |
1001 int _calls; | |
1002 | |
1003 // when the virtual timer reaches this time, the marking step should | |
1004 // exit | |
1005 double _time_target_ms; | |
1006 // the start time of the current marking step | |
1007 double _start_time_ms; | |
1008 | |
1009 // the oop closure used for iterations over oops | |
3771 | 1010 G1CMOopClosure* _cm_oop_closure; |
342 | 1011 |
1012 // the region this task is scanning, NULL if we're not scanning any | |
1013 HeapRegion* _curr_region; | |
1014 // the local finger of this task, NULL if we're not scanning a region | |
1015 HeapWord* _finger; | |
1016 // limit of the region this task is scanning, NULL if we're not scanning one | |
1017 HeapWord* _region_limit; | |
1018 | |
1019 // the number of words this task has scanned | |
1020 size_t _words_scanned; | |
1021 // When _words_scanned reaches this limit, the regular clock is | |
1022 // called. Notice that this might be decreased under certain | |
1023 // circumstances (i.e. when we believe that we did an expensive | |
1024 // operation). | |
1025 size_t _words_scanned_limit; | |
1026 // the initial value of _words_scanned_limit (i.e. what it was | |
1027 // before it was decreased). | |
1028 size_t _real_words_scanned_limit; | |
1029 | |
1030 // the number of references this task has visited | |
1031 size_t _refs_reached; | |
1032 // When _refs_reached reaches this limit, the regular clock is | |
1033 // called. Notice this this might be decreased under certain | |
1034 // circumstances (i.e. when we believe that we did an expensive | |
1035 // operation). | |
1036 size_t _refs_reached_limit; | |
1037 // the initial value of _refs_reached_limit (i.e. what it was before | |
1038 // it was decreased). | |
1039 size_t _real_refs_reached_limit; | |
1040 | |
1041 // used by the work stealing stuff | |
1042 int _hash_seed; | |
1043 // if this is true, then the task has aborted for some reason | |
1044 bool _has_aborted; | |
1045 // set when the task aborts because it has met its time quota | |
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1046 bool _has_timed_out; |
342 | 1047 // true when we're draining SATB buffers; this avoids the task |
1048 // aborting due to SATB buffers being available (as we're already | |
1049 // dealing with them) | |
1050 bool _draining_satb_buffers; | |
1051 | |
1052 // number sequence of past step times | |
1053 NumberSeq _step_times_ms; | |
1054 // elapsed time of this task | |
1055 double _elapsed_time_ms; | |
1056 // termination time of this task | |
1057 double _termination_time_ms; | |
1058 // when this task got into the termination protocol | |
1059 double _termination_start_time_ms; | |
1060 | |
1061 // true when the task is during a concurrent phase, false when it is | |
1062 // in the remark phase (so, in the latter case, we do not have to | |
1063 // check all the things that we have to check during the concurrent | |
1064 // phase, i.e. SATB buffer availability...) | |
1065 bool _concurrent; | |
1066 | |
1067 TruncatedSeq _marking_step_diffs_ms; | |
1068 | |
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1069 // Counting data structures. Embedding the task's marked_bytes_array |
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1070 // and card bitmap into the actual task saves having to go through |
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1071 // the ConcurrentMark object. |
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1072 size_t* _marked_bytes_array; |
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1073 BitMap* _card_bm; |
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1074 |
342 | 1075 // LOTS of statistics related with this task |
1076 #if _MARKING_STATS_ | |
1077 NumberSeq _all_clock_intervals_ms; | |
1078 double _interval_start_time_ms; | |
1079 | |
1080 int _aborted; | |
1081 int _aborted_overflow; | |
1082 int _aborted_cm_aborted; | |
1083 int _aborted_yield; | |
1084 int _aborted_timed_out; | |
1085 int _aborted_satb; | |
1086 int _aborted_termination; | |
1087 | |
1088 int _steal_attempts; | |
1089 int _steals; | |
1090 | |
1091 int _clock_due_to_marking; | |
1092 int _clock_due_to_scanning; | |
1093 | |
1094 int _local_pushes; | |
1095 int _local_pops; | |
1096 int _local_max_size; | |
1097 int _objs_scanned; | |
1098 | |
1099 int _global_pushes; | |
1100 int _global_pops; | |
1101 int _global_max_size; | |
1102 | |
1103 int _global_transfers_to; | |
1104 int _global_transfers_from; | |
1105 | |
1106 int _regions_claimed; | |
1107 int _objs_found_on_bitmap; | |
1108 | |
1109 int _satb_buffers_processed; | |
1110 #endif // _MARKING_STATS_ | |
1111 | |
1112 // it updates the local fields after this task has claimed | |
1113 // a new region to scan | |
1114 void setup_for_region(HeapRegion* hr); | |
1115 // it brings up-to-date the limit of the region | |
1116 void update_region_limit(); | |
1117 | |
1118 // called when either the words scanned or the refs visited limit | |
1119 // has been reached | |
1120 void reached_limit(); | |
1121 // recalculates the words scanned and refs visited limits | |
1122 void recalculate_limits(); | |
1123 // decreases the words scanned and refs visited limits when we reach | |
1124 // an expensive operation | |
1125 void decrease_limits(); | |
1126 // it checks whether the words scanned or refs visited reached their | |
1127 // respective limit and calls reached_limit() if they have | |
1128 void check_limits() { | |
1129 if (_words_scanned >= _words_scanned_limit || | |
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1130 _refs_reached >= _refs_reached_limit) { |
342 | 1131 reached_limit(); |
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1132 } |
342 | 1133 } |
1134 // this is supposed to be called regularly during a marking step as | |
1135 // it checks a bunch of conditions that might cause the marking step | |
1136 // to abort | |
1137 void regular_clock_call(); | |
1138 bool concurrent() { return _concurrent; } | |
1139 | |
1140 public: | |
1141 // It resets the task; it should be called right at the beginning of | |
1142 // a marking phase. | |
1143 void reset(CMBitMap* _nextMarkBitMap); | |
1144 // it clears all the fields that correspond to a claimed region. | |
1145 void clear_region_fields(); | |
1146 | |
1147 void set_concurrent(bool concurrent) { _concurrent = concurrent; } | |
1148 | |
1149 // The main method of this class which performs a marking step | |
1150 // trying not to exceed the given duration. However, it might exit | |
1151 // prematurely, according to some conditions (i.e. SATB buffers are | |
1152 // available for processing). | |
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1153 void do_marking_step(double target_ms, |
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1154 bool do_termination, |
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1155 bool is_serial); |
342 | 1156 |
1157 // These two calls start and stop the timer | |
1158 void record_start_time() { | |
1159 _elapsed_time_ms = os::elapsedTime() * 1000.0; | |
1160 } | |
1161 void record_end_time() { | |
1162 _elapsed_time_ms = os::elapsedTime() * 1000.0 - _elapsed_time_ms; | |
1163 } | |
1164 | |
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1165 // returns the worker ID associated with this task. |
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1166 uint worker_id() { return _worker_id; } |
342 | 1167 |
1168 // From TerminatorTerminator. It determines whether this task should | |
1169 // exit the termination protocol after it's entered it. | |
1170 virtual bool should_exit_termination(); | |
1171 | |
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1172 // Resets the local region fields after a task has finished scanning a |
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1173 // region; or when they have become stale as a result of the region |
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1174 // being evacuated. |
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1175 void giveup_current_region(); |
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1176 |
342 | 1177 HeapWord* finger() { return _finger; } |
1178 | |
1179 bool has_aborted() { return _has_aborted; } | |
1180 void set_has_aborted() { _has_aborted = true; } | |
1181 void clear_has_aborted() { _has_aborted = false; } | |
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1182 bool has_timed_out() { return _has_timed_out; } |
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1183 bool claimed() { return _claimed; } |
342 | 1184 |
3771 | 1185 void set_cm_oop_closure(G1CMOopClosure* cm_oop_closure); |
342 | 1186 |
1187 // It grays the object by marking it and, if necessary, pushing it | |
1188 // on the local queue | |
3771 | 1189 inline void deal_with_reference(oop obj); |
342 | 1190 |
1191 // It scans an object and visits its children. | |
3771 | 1192 void scan_object(oop obj); |
342 | 1193 |
1194 // It pushes an object on the local queue. | |
3771 | 1195 inline void push(oop obj); |
342 | 1196 |
1197 // These two move entries to/from the global stack. | |
1198 void move_entries_to_global_stack(); | |
1199 void get_entries_from_global_stack(); | |
1200 | |
1201 // It pops and scans objects from the local queue. If partially is | |
1202 // true, then it stops when the queue size is of a given limit. If | |
1203 // partially is false, then it stops when the queue is empty. | |
1204 void drain_local_queue(bool partially); | |
1205 // It moves entries from the global stack to the local queue and | |
1206 // drains the local queue. If partially is true, then it stops when | |
1207 // both the global stack and the local queue reach a given size. If | |
1208 // partially if false, it tries to empty them totally. | |
1209 void drain_global_stack(bool partially); | |
1210 // It keeps picking SATB buffers and processing them until no SATB | |
1211 // buffers are available. | |
1212 void drain_satb_buffers(); | |
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1213 |
342 | 1214 // moves the local finger to a new location |
1215 inline void move_finger_to(HeapWord* new_finger) { | |
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1216 assert(new_finger >= _finger && new_finger < _region_limit, "invariant"); |
342 | 1217 _finger = new_finger; |
1218 } | |
1219 | |
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1220 CMTask(uint worker_id, ConcurrentMark *cm, |
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1221 size_t* marked_bytes, BitMap* card_bm, |
342 | 1222 CMTaskQueue* task_queue, CMTaskQueueSet* task_queues); |
1223 | |
1224 // it prints statistics associated with this task | |
1225 void print_stats(); | |
1226 | |
1227 #if _MARKING_STATS_ | |
1228 void increase_objs_found_on_bitmap() { ++_objs_found_on_bitmap; } | |
1229 #endif // _MARKING_STATS_ | |
1230 }; | |
1972 | 1231 |
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1232 // Class that's used to to print out per-region liveness |
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1233 // information. It's currently used at the end of marking and also |
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1234 // after we sort the old regions at the end of the cleanup operation. |
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1235 class G1PrintRegionLivenessInfoClosure: public HeapRegionClosure { |
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1236 private: |
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1237 outputStream* _out; |
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1238 |
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1239 // Accumulators for these values. |
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1240 size_t _total_used_bytes; |
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1241 size_t _total_capacity_bytes; |
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1242 size_t _total_prev_live_bytes; |
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1243 size_t _total_next_live_bytes; |
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1244 |
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1245 // These are set up when we come across a "stars humongous" region |
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1246 // (as this is where most of this information is stored, not in the |
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1247 // subsequent "continues humongous" regions). After that, for every |
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1248 // region in a given humongous region series we deduce the right |
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1249 // values for it by simply subtracting the appropriate amount from |
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1250 // these fields. All these values should reach 0 after we've visited |
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1251 // the last region in the series. |
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1252 size_t _hum_used_bytes; |
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1253 size_t _hum_capacity_bytes; |
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1254 size_t _hum_prev_live_bytes; |
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1255 size_t _hum_next_live_bytes; |
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1256 |
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1257 // Accumulator for the remembered set size |
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1258 size_t _total_remset_bytes; |
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1259 |
12080 | 1260 // Accumulator for strong code roots memory size |
1261 size_t _total_strong_code_roots_bytes; | |
1262 | |
2435
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1263 static double perc(size_t val, size_t total) { |
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1264 if (total == 0) { |
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1265 return 0.0; |
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1266 } else { |
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1267 return 100.0 * ((double) val / (double) total); |
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1268 } |
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1269 } |
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1270 |
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1271 static double bytes_to_mb(size_t val) { |
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1272 return (double) val / (double) M; |
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1273 } |
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1274 |
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1275 // See the .cpp file. |
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1276 size_t get_hum_bytes(size_t* hum_bytes); |
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1277 void get_hum_bytes(size_t* used_bytes, size_t* capacity_bytes, |
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1278 size_t* prev_live_bytes, size_t* next_live_bytes); |
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1279 |
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1280 public: |
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1281 // The header and footer are printed in the constructor and |
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1282 // destructor respectively. |
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1283 G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name); |
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1284 virtual bool doHeapRegion(HeapRegion* r); |
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1285 ~G1PrintRegionLivenessInfoClosure(); |
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1286 }; |
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1287 |
1972 | 1288 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP |