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annotate src/share/vm/gc_implementation/g1/heapRegion.hpp @ 6010:720b6a76dd9d
7157073: G1: type change size_t -> uint for region counts / indexes
Summary: Change the type of fields / variables / etc. that represent region counts and indeces from size_t to uint.
Reviewed-by: iveresov, brutisso, jmasa, jwilhelm
author | tonyp |
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date | Wed, 18 Apr 2012 07:21:15 -0400 |
parents | b632e80fc9dc |
children | f7a8920427a6 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP | |
27 | |
28 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" | |
29 #include "gc_implementation/g1/g1_specialized_oop_closures.hpp" | |
30 #include "gc_implementation/g1/survRateGroup.hpp" | |
31 #include "gc_implementation/shared/ageTable.hpp" | |
32 #include "gc_implementation/shared/spaceDecorator.hpp" | |
33 #include "memory/space.inline.hpp" | |
34 #include "memory/watermark.hpp" | |
35 | |
342 | 36 #ifndef SERIALGC |
37 | |
38 // A HeapRegion is the smallest piece of a G1CollectedHeap that | |
39 // can be collected independently. | |
40 | |
41 // NOTE: Although a HeapRegion is a Space, its | |
42 // Space::initDirtyCardClosure method must not be called. | |
43 // The problem is that the existence of this method breaks | |
44 // the independence of barrier sets from remembered sets. | |
45 // The solution is to remove this method from the definition | |
46 // of a Space. | |
47 | |
48 class CompactibleSpace; | |
49 class ContiguousSpace; | |
50 class HeapRegionRemSet; | |
51 class HeapRegionRemSetIterator; | |
52 class HeapRegion; | |
2152 | 53 class HeapRegionSetBase; |
54 | |
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55 #define HR_FORMAT "%u:(%s)["PTR_FORMAT","PTR_FORMAT","PTR_FORMAT"]" |
3766 | 56 #define HR_FORMAT_PARAMS(_hr_) \ |
57 (_hr_)->hrs_index(), \ | |
58 (_hr_)->is_survivor() ? "S" : (_hr_)->is_young() ? "E" : "-", \ | |
59 (_hr_)->bottom(), (_hr_)->top(), (_hr_)->end() | |
342 | 60 |
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61 // sentinel value for hrs_index |
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62 #define G1_NULL_HRS_INDEX ((uint) -1) |
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63 |
342 | 64 // A dirty card to oop closure for heap regions. It |
65 // knows how to get the G1 heap and how to use the bitmap | |
66 // in the concurrent marker used by G1 to filter remembered | |
67 // sets. | |
68 | |
69 class HeapRegionDCTOC : public ContiguousSpaceDCTOC { | |
70 public: | |
71 // Specification of possible DirtyCardToOopClosure filtering. | |
72 enum FilterKind { | |
73 NoFilterKind, | |
74 IntoCSFilterKind, | |
75 OutOfRegionFilterKind | |
76 }; | |
77 | |
78 protected: | |
79 HeapRegion* _hr; | |
80 FilterKind _fk; | |
81 G1CollectedHeap* _g1; | |
82 | |
83 void walk_mem_region_with_cl(MemRegion mr, | |
84 HeapWord* bottom, HeapWord* top, | |
85 OopClosure* cl); | |
86 | |
87 // We don't specialize this for FilteringClosure; filtering is handled by | |
88 // the "FilterKind" mechanism. But we provide this to avoid a compiler | |
89 // warning. | |
90 void walk_mem_region_with_cl(MemRegion mr, | |
91 HeapWord* bottom, HeapWord* top, | |
92 FilteringClosure* cl) { | |
93 HeapRegionDCTOC::walk_mem_region_with_cl(mr, bottom, top, | |
94 (OopClosure*)cl); | |
95 } | |
96 | |
97 // Get the actual top of the area on which the closure will | |
98 // operate, given where the top is assumed to be (the end of the | |
99 // memory region passed to do_MemRegion) and where the object | |
100 // at the top is assumed to start. For example, an object may | |
101 // start at the top but actually extend past the assumed top, | |
102 // in which case the top becomes the end of the object. | |
103 HeapWord* get_actual_top(HeapWord* top, HeapWord* top_obj) { | |
104 return ContiguousSpaceDCTOC::get_actual_top(top, top_obj); | |
105 } | |
106 | |
107 // Walk the given memory region from bottom to (actual) top | |
108 // looking for objects and applying the oop closure (_cl) to | |
109 // them. The base implementation of this treats the area as | |
110 // blocks, where a block may or may not be an object. Sub- | |
111 // classes should override this to provide more accurate | |
112 // or possibly more efficient walking. | |
113 void walk_mem_region(MemRegion mr, HeapWord* bottom, HeapWord* top) { | |
114 Filtering_DCTOC::walk_mem_region(mr, bottom, top); | |
115 } | |
116 | |
117 public: | |
118 HeapRegionDCTOC(G1CollectedHeap* g1, | |
119 HeapRegion* hr, OopClosure* cl, | |
120 CardTableModRefBS::PrecisionStyle precision, | |
121 FilterKind fk); | |
122 }; | |
123 | |
124 // The complicating factor is that BlockOffsetTable diverged | |
125 // significantly, and we need functionality that is only in the G1 version. | |
126 // So I copied that code, which led to an alternate G1 version of | |
127 // OffsetTableContigSpace. If the two versions of BlockOffsetTable could | |
128 // be reconciled, then G1OffsetTableContigSpace could go away. | |
129 | |
130 // The idea behind time stamps is the following. Doing a save_marks on | |
131 // all regions at every GC pause is time consuming (if I remember | |
132 // well, 10ms or so). So, we would like to do that only for regions | |
133 // that are GC alloc regions. To achieve this, we use time | |
134 // stamps. For every evacuation pause, G1CollectedHeap generates a | |
135 // unique time stamp (essentially a counter that gets | |
136 // incremented). Every time we want to call save_marks on a region, | |
137 // we set the saved_mark_word to top and also copy the current GC | |
138 // time stamp to the time stamp field of the space. Reading the | |
139 // saved_mark_word involves checking the time stamp of the | |
140 // region. If it is the same as the current GC time stamp, then we | |
141 // can safely read the saved_mark_word field, as it is valid. If the | |
142 // time stamp of the region is not the same as the current GC time | |
143 // stamp, then we instead read top, as the saved_mark_word field is | |
144 // invalid. Time stamps (on the regions and also on the | |
145 // G1CollectedHeap) are reset at every cleanup (we iterate over | |
146 // the regions anyway) and at the end of a Full GC. The current scheme | |
147 // that uses sequential unsigned ints will fail only if we have 4b | |
148 // evacuation pauses between two cleanups, which is _highly_ unlikely. | |
149 | |
150 class G1OffsetTableContigSpace: public ContiguousSpace { | |
151 friend class VMStructs; | |
152 protected: | |
153 G1BlockOffsetArrayContigSpace _offsets; | |
154 Mutex _par_alloc_lock; | |
155 volatile unsigned _gc_time_stamp; | |
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156 // When we need to retire an allocation region, while other threads |
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157 // are also concurrently trying to allocate into it, we typically |
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158 // allocate a dummy object at the end of the region to ensure that |
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159 // no more allocations can take place in it. However, sometimes we |
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160 // want to know where the end of the last "real" object we allocated |
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161 // into the region was and this is what this keeps track. |
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162 HeapWord* _pre_dummy_top; |
342 | 163 |
164 public: | |
165 // Constructor. If "is_zeroed" is true, the MemRegion "mr" may be | |
166 // assumed to contain zeros. | |
167 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
168 MemRegion mr, bool is_zeroed = false); | |
169 | |
170 void set_bottom(HeapWord* value); | |
171 void set_end(HeapWord* value); | |
172 | |
173 virtual HeapWord* saved_mark_word() const; | |
174 virtual void set_saved_mark(); | |
175 void reset_gc_time_stamp() { _gc_time_stamp = 0; } | |
176 | |
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177 // See the comment above in the declaration of _pre_dummy_top for an |
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178 // explanation of what it is. |
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179 void set_pre_dummy_top(HeapWord* pre_dummy_top) { |
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180 assert(is_in(pre_dummy_top) && pre_dummy_top <= top(), "pre-condition"); |
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181 _pre_dummy_top = pre_dummy_top; |
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182 } |
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183 HeapWord* pre_dummy_top() { |
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184 return (_pre_dummy_top == NULL) ? top() : _pre_dummy_top; |
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185 } |
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186 void reset_pre_dummy_top() { _pre_dummy_top = NULL; } |
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187 |
356 | 188 virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
189 virtual void clear(bool mangle_space); | |
342 | 190 |
191 HeapWord* block_start(const void* p); | |
192 HeapWord* block_start_const(const void* p) const; | |
193 | |
194 // Add offset table update. | |
195 virtual HeapWord* allocate(size_t word_size); | |
196 HeapWord* par_allocate(size_t word_size); | |
197 | |
198 // MarkSweep support phase3 | |
199 virtual HeapWord* initialize_threshold(); | |
200 virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* end); | |
201 | |
202 virtual void print() const; | |
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203 |
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204 void reset_bot() { |
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205 _offsets.zero_bottom_entry(); |
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206 _offsets.initialize_threshold(); |
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207 } |
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208 |
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209 void update_bot_for_object(HeapWord* start, size_t word_size) { |
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210 _offsets.alloc_block(start, word_size); |
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211 } |
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212 |
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213 void print_bot_on(outputStream* out) { |
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214 _offsets.print_on(out); |
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215 } |
342 | 216 }; |
217 | |
218 class HeapRegion: public G1OffsetTableContigSpace { | |
219 friend class VMStructs; | |
220 private: | |
221 | |
355 | 222 enum HumongousType { |
223 NotHumongous = 0, | |
224 StartsHumongous, | |
225 ContinuesHumongous | |
226 }; | |
227 | |
342 | 228 // Requires that the region "mr" be dense with objects, and begin and end |
229 // with an object. | |
230 void oops_in_mr_iterate(MemRegion mr, OopClosure* cl); | |
231 | |
232 // The remembered set for this region. | |
233 // (Might want to make this "inline" later, to avoid some alloc failure | |
234 // issues.) | |
235 HeapRegionRemSet* _rem_set; | |
236 | |
237 G1BlockOffsetArrayContigSpace* offsets() { return &_offsets; } | |
238 | |
239 protected: | |
3766 | 240 // The index of this region in the heap region sequence. |
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241 uint _hrs_index; |
342 | 242 |
355 | 243 HumongousType _humongous_type; |
342 | 244 // For a humongous region, region in which it starts. |
245 HeapRegion* _humongous_start_region; | |
246 // For the start region of a humongous sequence, it's original end(). | |
247 HeapWord* _orig_end; | |
248 | |
249 // True iff the region is in current collection_set. | |
250 bool _in_collection_set; | |
251 | |
252 // True iff an attempt to evacuate an object in the region failed. | |
253 bool _evacuation_failed; | |
254 | |
255 // A heap region may be a member one of a number of special subsets, each | |
256 // represented as linked lists through the field below. Currently, these | |
257 // sets include: | |
258 // The collection set. | |
259 // The set of allocation regions used in a collection pause. | |
260 // Spaces that may contain gray objects. | |
261 HeapRegion* _next_in_special_set; | |
262 | |
263 // next region in the young "generation" region set | |
264 HeapRegion* _next_young_region; | |
265 | |
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266 // Next region whose cards need cleaning |
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267 HeapRegion* _next_dirty_cards_region; |
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268 |
2152 | 269 // Fields used by the HeapRegionSetBase class and subclasses. |
270 HeapRegion* _next; | |
271 #ifdef ASSERT | |
272 HeapRegionSetBase* _containing_set; | |
273 #endif // ASSERT | |
274 bool _pending_removal; | |
275 | |
342 | 276 // For parallel heapRegion traversal. |
277 jint _claimed; | |
278 | |
279 // We use concurrent marking to determine the amount of live data | |
280 // in each heap region. | |
281 size_t _prev_marked_bytes; // Bytes known to be live via last completed marking. | |
282 size_t _next_marked_bytes; // Bytes known to be live via in-progress marking. | |
283 | |
284 // See "sort_index" method. -1 means is not in the array. | |
285 int _sort_index; | |
286 | |
287 // <PREDICTION> | |
288 double _gc_efficiency; | |
289 // </PREDICTION> | |
290 | |
291 enum YoungType { | |
292 NotYoung, // a region is not young | |
293 Young, // a region is young | |
3766 | 294 Survivor // a region is young and it contains survivors |
342 | 295 }; |
296 | |
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297 volatile YoungType _young_type; |
342 | 298 int _young_index_in_cset; |
299 SurvRateGroup* _surv_rate_group; | |
300 int _age_index; | |
301 | |
302 // The start of the unmarked area. The unmarked area extends from this | |
303 // word until the top and/or end of the region, and is the part | |
304 // of the region for which no marking was done, i.e. objects may | |
305 // have been allocated in this part since the last mark phase. | |
306 // "prev" is the top at the start of the last completed marking. | |
307 // "next" is the top at the start of the in-progress marking (if any.) | |
308 HeapWord* _prev_top_at_mark_start; | |
309 HeapWord* _next_top_at_mark_start; | |
310 // If a collection pause is in progress, this is the top at the start | |
311 // of that pause. | |
312 | |
313 // We've counted the marked bytes of objects below here. | |
314 HeapWord* _top_at_conc_mark_count; | |
315 | |
316 void init_top_at_mark_start() { | |
317 assert(_prev_marked_bytes == 0 && | |
318 _next_marked_bytes == 0, | |
319 "Must be called after zero_marked_bytes."); | |
320 HeapWord* bot = bottom(); | |
321 _prev_top_at_mark_start = bot; | |
322 _next_top_at_mark_start = bot; | |
323 _top_at_conc_mark_count = bot; | |
324 } | |
325 | |
326 void set_young_type(YoungType new_type) { | |
327 //assert(_young_type != new_type, "setting the same type" ); | |
328 // TODO: add more assertions here | |
329 _young_type = new_type; | |
330 } | |
331 | |
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332 // Cached attributes used in the collection set policy information |
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333 |
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334 // The RSet length that was added to the total value |
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335 // for the collection set. |
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336 size_t _recorded_rs_length; |
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337 |
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338 // The predicted elapsed time that was added to total value |
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339 // for the collection set. |
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340 double _predicted_elapsed_time_ms; |
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341 |
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342 // The predicted number of bytes to copy that was added to |
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343 // the total value for the collection set. |
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344 size_t _predicted_bytes_to_copy; |
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345 |
342 | 346 public: |
347 // If "is_zeroed" is "true", the region "mr" can be assumed to contain zeros. | |
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348 HeapRegion(uint hrs_index, |
3766 | 349 G1BlockOffsetSharedArray* sharedOffsetArray, |
342 | 350 MemRegion mr, bool is_zeroed); |
351 | |
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352 static int LogOfHRGrainBytes; |
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353 static int LogOfHRGrainWords; |
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354 |
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355 static size_t GrainBytes; |
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356 static size_t GrainWords; |
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357 static size_t CardsPerRegion; |
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358 |
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359 static size_t align_up_to_region_byte_size(size_t sz) { |
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360 return (sz + (size_t) GrainBytes - 1) & |
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361 ~((1 << (size_t) LogOfHRGrainBytes) - 1); |
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362 } |
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363 |
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364 // It sets up the heap region size (GrainBytes / GrainWords), as |
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365 // well as other related fields that are based on the heap region |
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366 // size (LogOfHRGrainBytes / LogOfHRGrainWords / |
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367 // CardsPerRegion). All those fields are considered constant |
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368 // throughout the JVM's execution, therefore they should only be set |
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369 // up once during initialization time. |
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370 static void setup_heap_region_size(uintx min_heap_size); |
342 | 371 |
355 | 372 enum ClaimValues { |
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373 InitialClaimValue = 0, |
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374 FinalCountClaimValue = 1, |
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375 NoteEndClaimValue = 2, |
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376 ScrubRemSetClaimValue = 3, |
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377 ParVerifyClaimValue = 4, |
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378 RebuildRSClaimValue = 5, |
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379 ParEvacFailureClaimValue = 6, |
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380 AggregateCountClaimValue = 7, |
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381 VerifyCountClaimValue = 8 |
355 | 382 }; |
383 | |
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384 inline HeapWord* par_allocate_no_bot_updates(size_t word_size) { |
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385 assert(is_young(), "we can only skip BOT updates on young regions"); |
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386 return ContiguousSpace::par_allocate(word_size); |
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387 } |
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388 inline HeapWord* allocate_no_bot_updates(size_t word_size) { |
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389 assert(is_young(), "we can only skip BOT updates on young regions"); |
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390 return ContiguousSpace::allocate(word_size); |
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391 } |
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392 |
342 | 393 // If this region is a member of a HeapRegionSeq, the index in that |
394 // sequence, otherwise -1. | |
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395 uint hrs_index() const { return _hrs_index; } |
342 | 396 |
397 // The number of bytes marked live in the region in the last marking phase. | |
398 size_t marked_bytes() { return _prev_marked_bytes; } | |
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399 size_t live_bytes() { |
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400 return (top() - prev_top_at_mark_start()) * HeapWordSize + marked_bytes(); |
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401 } |
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402 |
342 | 403 // The number of bytes counted in the next marking. |
404 size_t next_marked_bytes() { return _next_marked_bytes; } | |
405 // The number of bytes live wrt the next marking. | |
406 size_t next_live_bytes() { | |
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407 return |
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408 (top() - next_top_at_mark_start()) * HeapWordSize + next_marked_bytes(); |
342 | 409 } |
410 | |
411 // A lower bound on the amount of garbage bytes in the region. | |
412 size_t garbage_bytes() { | |
413 size_t used_at_mark_start_bytes = | |
414 (prev_top_at_mark_start() - bottom()) * HeapWordSize; | |
415 assert(used_at_mark_start_bytes >= marked_bytes(), | |
416 "Can't mark more than we have."); | |
417 return used_at_mark_start_bytes - marked_bytes(); | |
418 } | |
419 | |
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420 // Return the amount of bytes we'll reclaim if we collect this |
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421 // region. This includes not only the known garbage bytes in the |
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422 // region but also any unallocated space in it, i.e., [top, end), |
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423 // since it will also be reclaimed if we collect the region. |
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424 size_t reclaimable_bytes() { |
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425 size_t known_live_bytes = live_bytes(); |
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426 assert(known_live_bytes <= capacity(), "sanity"); |
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427 return capacity() - known_live_bytes; |
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428 } |
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429 |
342 | 430 // An upper bound on the number of live bytes in the region. |
431 size_t max_live_bytes() { return used() - garbage_bytes(); } | |
432 | |
433 void add_to_marked_bytes(size_t incr_bytes) { | |
434 _next_marked_bytes = _next_marked_bytes + incr_bytes; | |
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435 assert(_next_marked_bytes <= used(), "invariant" ); |
342 | 436 } |
437 | |
438 void zero_marked_bytes() { | |
439 _prev_marked_bytes = _next_marked_bytes = 0; | |
440 } | |
441 | |
355 | 442 bool isHumongous() const { return _humongous_type != NotHumongous; } |
443 bool startsHumongous() const { return _humongous_type == StartsHumongous; } | |
444 bool continuesHumongous() const { return _humongous_type == ContinuesHumongous; } | |
342 | 445 // For a humongous region, region in which it starts. |
446 HeapRegion* humongous_start_region() const { | |
447 return _humongous_start_region; | |
448 } | |
449 | |
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450 // Same as Space::is_in_reserved, but will use the original size of the region. |
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451 // The original size is different only for start humongous regions. They get |
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452 // their _end set up to be the end of the last continues region of the |
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453 // corresponding humongous object. |
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454 bool is_in_reserved_raw(const void* p) const { |
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455 return _bottom <= p && p < _orig_end; |
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456 } |
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457 |
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458 // Makes the current region be a "starts humongous" region, i.e., |
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459 // the first region in a series of one or more contiguous regions |
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460 // that will contain a single "humongous" object. The two parameters |
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461 // are as follows: |
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462 // |
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463 // new_top : The new value of the top field of this region which |
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464 // points to the end of the humongous object that's being |
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465 // allocated. If there is more than one region in the series, top |
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466 // will lie beyond this region's original end field and on the last |
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467 // region in the series. |
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468 // |
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469 // new_end : The new value of the end field of this region which |
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470 // points to the end of the last region in the series. If there is |
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471 // one region in the series (namely: this one) end will be the same |
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472 // as the original end of this region. |
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473 // |
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474 // Updating top and end as described above makes this region look as |
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475 // if it spans the entire space taken up by all the regions in the |
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476 // series and an single allocation moved its top to new_top. This |
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477 // ensures that the space (capacity / allocated) taken up by all |
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478 // humongous regions can be calculated by just looking at the |
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479 // "starts humongous" regions and by ignoring the "continues |
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480 // humongous" regions. |
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481 void set_startsHumongous(HeapWord* new_top, HeapWord* new_end); |
342 | 482 |
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483 // Makes the current region be a "continues humongous' |
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484 // region. first_hr is the "start humongous" region of the series |
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485 // which this region will be part of. |
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486 void set_continuesHumongous(HeapRegion* first_hr); |
342 | 487 |
2152 | 488 // Unsets the humongous-related fields on the region. |
489 void set_notHumongous(); | |
490 | |
342 | 491 // If the region has a remembered set, return a pointer to it. |
492 HeapRegionRemSet* rem_set() const { | |
493 return _rem_set; | |
494 } | |
495 | |
496 // True iff the region is in current collection_set. | |
497 bool in_collection_set() const { | |
498 return _in_collection_set; | |
499 } | |
500 void set_in_collection_set(bool b) { | |
501 _in_collection_set = b; | |
502 } | |
503 HeapRegion* next_in_collection_set() { | |
504 assert(in_collection_set(), "should only invoke on member of CS."); | |
505 assert(_next_in_special_set == NULL || | |
506 _next_in_special_set->in_collection_set(), | |
507 "Malformed CS."); | |
508 return _next_in_special_set; | |
509 } | |
510 void set_next_in_collection_set(HeapRegion* r) { | |
511 assert(in_collection_set(), "should only invoke on member of CS."); | |
512 assert(r == NULL || r->in_collection_set(), "Malformed CS."); | |
513 _next_in_special_set = r; | |
514 } | |
515 | |
2152 | 516 // Methods used by the HeapRegionSetBase class and subclasses. |
342 | 517 |
2152 | 518 // Getter and setter for the next field used to link regions into |
519 // linked lists. | |
520 HeapRegion* next() { return _next; } | |
521 | |
522 void set_next(HeapRegion* next) { _next = next; } | |
342 | 523 |
2152 | 524 // Every region added to a set is tagged with a reference to that |
525 // set. This is used for doing consistency checking to make sure that | |
526 // the contents of a set are as they should be and it's only | |
527 // available in non-product builds. | |
528 #ifdef ASSERT | |
529 void set_containing_set(HeapRegionSetBase* containing_set) { | |
530 assert((containing_set == NULL && _containing_set != NULL) || | |
531 (containing_set != NULL && _containing_set == NULL), | |
532 err_msg("containing_set: "PTR_FORMAT" " | |
533 "_containing_set: "PTR_FORMAT, | |
534 containing_set, _containing_set)); | |
535 | |
536 _containing_set = containing_set; | |
2361 | 537 } |
342 | 538 |
2152 | 539 HeapRegionSetBase* containing_set() { return _containing_set; } |
540 #else // ASSERT | |
541 void set_containing_set(HeapRegionSetBase* containing_set) { } | |
342 | 542 |
2361 | 543 // containing_set() is only used in asserts so there's no reason |
2152 | 544 // to provide a dummy version of it. |
545 #endif // ASSERT | |
342 | 546 |
2152 | 547 // If we want to remove regions from a list in bulk we can simply tag |
548 // them with the pending_removal tag and call the | |
549 // remove_all_pending() method on the list. | |
342 | 550 |
2152 | 551 bool pending_removal() { return _pending_removal; } |
552 | |
553 void set_pending_removal(bool pending_removal) { | |
2361 | 554 if (pending_removal) { |
555 assert(!_pending_removal && containing_set() != NULL, | |
556 "can only set pending removal to true if it's false and " | |
557 "the region belongs to a region set"); | |
558 } else { | |
559 assert( _pending_removal && containing_set() == NULL, | |
560 "can only set pending removal to false if it's true and " | |
561 "the region does not belong to a region set"); | |
562 } | |
2152 | 563 |
564 _pending_removal = pending_removal; | |
342 | 565 } |
566 | |
567 HeapRegion* get_next_young_region() { return _next_young_region; } | |
568 void set_next_young_region(HeapRegion* hr) { | |
569 _next_young_region = hr; | |
570 } | |
571 | |
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572 HeapRegion* get_next_dirty_cards_region() const { return _next_dirty_cards_region; } |
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573 HeapRegion** next_dirty_cards_region_addr() { return &_next_dirty_cards_region; } |
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574 void set_next_dirty_cards_region(HeapRegion* hr) { _next_dirty_cards_region = hr; } |
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575 bool is_on_dirty_cards_region_list() const { return get_next_dirty_cards_region() != NULL; } |
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576 |
3766 | 577 HeapWord* orig_end() { return _orig_end; } |
578 | |
342 | 579 // Allows logical separation between objects allocated before and after. |
580 void save_marks(); | |
581 | |
582 // Reset HR stuff to default values. | |
583 void hr_clear(bool par, bool clear_space); | |
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584 void par_clear(); |
342 | 585 |
356 | 586 void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
342 | 587 |
588 // Get the start of the unmarked area in this region. | |
589 HeapWord* prev_top_at_mark_start() const { return _prev_top_at_mark_start; } | |
590 HeapWord* next_top_at_mark_start() const { return _next_top_at_mark_start; } | |
591 | |
592 // Apply "cl->do_oop" to (the addresses of) all reference fields in objects | |
593 // allocated in the current region before the last call to "save_mark". | |
594 void oop_before_save_marks_iterate(OopClosure* cl); | |
595 | |
596 // Note the start or end of marking. This tells the heap region | |
597 // that the collector is about to start or has finished (concurrently) | |
598 // marking the heap. | |
599 | |
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600 // Notify the region that concurrent marking is starting. Initialize |
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601 // all fields related to the next marking info. |
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602 inline void note_start_of_marking(); |
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603 |
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604 // Notify the region that concurrent marking has finished. Copy the |
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605 // (now finalized) next marking info fields into the prev marking |
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606 // info fields. |
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607 inline void note_end_of_marking(); |
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608 |
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609 // Notify the region that it will be used as to-space during a GC |
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610 // and we are about to start copying objects into it. |
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611 inline void note_start_of_copying(bool during_initial_mark); |
342 | 612 |
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613 // Notify the region that it ceases being to-space during a GC and |
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614 // we will not copy objects into it any more. |
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615 inline void note_end_of_copying(bool during_initial_mark); |
342 | 616 |
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617 // Notify the region that we are about to start processing |
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618 // self-forwarded objects during evac failure handling. |
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619 void note_self_forwarding_removal_start(bool during_initial_mark, |
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620 bool during_conc_mark); |
342 | 621 |
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622 // Notify the region that we have finished processing self-forwarded |
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623 // objects during evac failure handling. |
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624 void note_self_forwarding_removal_end(bool during_initial_mark, |
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625 bool during_conc_mark, |
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626 size_t marked_bytes); |
342 | 627 |
628 // Returns "false" iff no object in the region was allocated when the | |
629 // last mark phase ended. | |
630 bool is_marked() { return _prev_top_at_mark_start != bottom(); } | |
631 | |
632 // If "is_marked()" is true, then this is the index of the region in | |
633 // an array constructed at the end of marking of the regions in a | |
634 // "desirability" order. | |
635 int sort_index() { | |
636 return _sort_index; | |
637 } | |
638 void set_sort_index(int i) { | |
639 _sort_index = i; | |
640 } | |
641 | |
642 void init_top_at_conc_mark_count() { | |
643 _top_at_conc_mark_count = bottom(); | |
644 } | |
645 | |
646 void set_top_at_conc_mark_count(HeapWord *cur) { | |
647 assert(bottom() <= cur && cur <= end(), "Sanity."); | |
648 _top_at_conc_mark_count = cur; | |
649 } | |
650 | |
651 HeapWord* top_at_conc_mark_count() { | |
652 return _top_at_conc_mark_count; | |
653 } | |
654 | |
655 void reset_during_compaction() { | |
656 guarantee( isHumongous() && startsHumongous(), | |
657 "should only be called for humongous regions"); | |
658 | |
659 zero_marked_bytes(); | |
660 init_top_at_mark_start(); | |
661 } | |
662 | |
663 void calc_gc_efficiency(void); | |
664 double gc_efficiency() { return _gc_efficiency;} | |
665 | |
666 bool is_young() const { return _young_type != NotYoung; } | |
667 bool is_survivor() const { return _young_type == Survivor; } | |
668 | |
669 int young_index_in_cset() const { return _young_index_in_cset; } | |
670 void set_young_index_in_cset(int index) { | |
671 assert( (index == -1) || is_young(), "pre-condition" ); | |
672 _young_index_in_cset = index; | |
673 } | |
674 | |
675 int age_in_surv_rate_group() { | |
676 assert( _surv_rate_group != NULL, "pre-condition" ); | |
677 assert( _age_index > -1, "pre-condition" ); | |
678 return _surv_rate_group->age_in_group(_age_index); | |
679 } | |
680 | |
681 void record_surv_words_in_group(size_t words_survived) { | |
682 assert( _surv_rate_group != NULL, "pre-condition" ); | |
683 assert( _age_index > -1, "pre-condition" ); | |
684 int age_in_group = age_in_surv_rate_group(); | |
685 _surv_rate_group->record_surviving_words(age_in_group, words_survived); | |
686 } | |
687 | |
688 int age_in_surv_rate_group_cond() { | |
689 if (_surv_rate_group != NULL) | |
690 return age_in_surv_rate_group(); | |
691 else | |
692 return -1; | |
693 } | |
694 | |
695 SurvRateGroup* surv_rate_group() { | |
696 return _surv_rate_group; | |
697 } | |
698 | |
699 void install_surv_rate_group(SurvRateGroup* surv_rate_group) { | |
700 assert( surv_rate_group != NULL, "pre-condition" ); | |
701 assert( _surv_rate_group == NULL, "pre-condition" ); | |
702 assert( is_young(), "pre-condition" ); | |
703 | |
704 _surv_rate_group = surv_rate_group; | |
705 _age_index = surv_rate_group->next_age_index(); | |
706 } | |
707 | |
708 void uninstall_surv_rate_group() { | |
709 if (_surv_rate_group != NULL) { | |
710 assert( _age_index > -1, "pre-condition" ); | |
711 assert( is_young(), "pre-condition" ); | |
712 | |
713 _surv_rate_group = NULL; | |
714 _age_index = -1; | |
715 } else { | |
716 assert( _age_index == -1, "pre-condition" ); | |
717 } | |
718 } | |
719 | |
720 void set_young() { set_young_type(Young); } | |
721 | |
722 void set_survivor() { set_young_type(Survivor); } | |
723 | |
724 void set_not_young() { set_young_type(NotYoung); } | |
725 | |
726 // Determine if an object has been allocated since the last | |
727 // mark performed by the collector. This returns true iff the object | |
728 // is within the unmarked area of the region. | |
729 bool obj_allocated_since_prev_marking(oop obj) const { | |
730 return (HeapWord *) obj >= prev_top_at_mark_start(); | |
731 } | |
732 bool obj_allocated_since_next_marking(oop obj) const { | |
733 return (HeapWord *) obj >= next_top_at_mark_start(); | |
734 } | |
735 | |
736 // For parallel heapRegion traversal. | |
737 bool claimHeapRegion(int claimValue); | |
738 jint claim_value() { return _claimed; } | |
739 // Use this carefully: only when you're sure no one is claiming... | |
740 void set_claim_value(int claimValue) { _claimed = claimValue; } | |
741 | |
742 // Returns the "evacuation_failed" property of the region. | |
743 bool evacuation_failed() { return _evacuation_failed; } | |
744 | |
745 // Sets the "evacuation_failed" property of the region. | |
746 void set_evacuation_failed(bool b) { | |
747 _evacuation_failed = b; | |
748 | |
749 if (b) { | |
750 init_top_at_conc_mark_count(); | |
751 _next_marked_bytes = 0; | |
752 } | |
753 } | |
754 | |
755 // Requires that "mr" be entirely within the region. | |
756 // Apply "cl->do_object" to all objects that intersect with "mr". | |
757 // If the iteration encounters an unparseable portion of the region, | |
758 // or if "cl->abort()" is true after a closure application, | |
759 // terminate the iteration and return the address of the start of the | |
760 // subregion that isn't done. (The two can be distinguished by querying | |
761 // "cl->abort()".) Return of "NULL" indicates that the iteration | |
762 // completed. | |
763 HeapWord* | |
764 object_iterate_mem_careful(MemRegion mr, ObjectClosure* cl); | |
765 | |
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766 // filter_young: if true and the region is a young region then we |
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767 // skip the iteration. |
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768 // card_ptr: if not NULL, and we decide that the card is not young |
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769 // and we iterate over it, we'll clean the card before we start the |
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770 // iteration. |
342 | 771 HeapWord* |
772 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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773 FilterOutOfRegionClosure* cl, |
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774 bool filter_young, |
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775 jbyte* card_ptr); |
342 | 776 |
777 // A version of block start that is guaranteed to find *some* block | |
778 // boundary at or before "p", but does not object iteration, and may | |
779 // therefore be used safely when the heap is unparseable. | |
780 HeapWord* block_start_careful(const void* p) const { | |
781 return _offsets.block_start_careful(p); | |
782 } | |
783 | |
784 // Requires that "addr" is within the region. Returns the start of the | |
785 // first ("careful") block that starts at or after "addr", or else the | |
786 // "end" of the region if there is no such block. | |
787 HeapWord* next_block_start_careful(HeapWord* addr); | |
788 | |
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789 size_t recorded_rs_length() const { return _recorded_rs_length; } |
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790 double predicted_elapsed_time_ms() const { return _predicted_elapsed_time_ms; } |
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791 size_t predicted_bytes_to_copy() const { return _predicted_bytes_to_copy; } |
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792 |
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793 void set_recorded_rs_length(size_t rs_length) { |
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794 _recorded_rs_length = rs_length; |
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795 } |
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796 |
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797 void set_predicted_elapsed_time_ms(double ms) { |
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798 _predicted_elapsed_time_ms = ms; |
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799 } |
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800 |
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801 void set_predicted_bytes_to_copy(size_t bytes) { |
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802 _predicted_bytes_to_copy = bytes; |
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803 } |
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804 |
342 | 805 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \ |
806 virtual void oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl); | |
807 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DECL) | |
808 | |
809 CompactibleSpace* next_compaction_space() const; | |
810 | |
811 virtual void reset_after_compaction(); | |
812 | |
813 void print() const; | |
814 void print_on(outputStream* st) const; | |
815 | |
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816 // vo == UsePrevMarking -> use "prev" marking information, |
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817 // vo == UseNextMarking -> use "next" marking information |
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818 // vo == UseMarkWord -> use the mark word in the object header |
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819 // |
811 | 820 // NOTE: Only the "prev" marking information is guaranteed to be |
821 // consistent most of the time, so most calls to this should use | |
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822 // vo == UsePrevMarking. |
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823 // Currently, there is only one case where this is called with |
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824 // vo == UseNextMarking, which is to verify the "next" marking |
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825 // information at the end of remark. |
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826 // Currently there is only one place where this is called with |
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827 // vo == UseMarkWord, which is to verify the marking during a |
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828 // full GC. |
6008 | 829 void verify(VerifyOption vo, bool *failures) const; |
811 | 830 |
831 // Override; it uses the "prev" marking information | |
6008 | 832 virtual void verify() const; |
342 | 833 }; |
834 | |
835 // HeapRegionClosure is used for iterating over regions. | |
836 // Terminates the iteration when the "doHeapRegion" method returns "true". | |
837 class HeapRegionClosure : public StackObj { | |
838 friend class HeapRegionSeq; | |
839 friend class G1CollectedHeap; | |
840 | |
841 bool _complete; | |
842 void incomplete() { _complete = false; } | |
843 | |
844 public: | |
845 HeapRegionClosure(): _complete(true) {} | |
846 | |
847 // Typically called on each region until it returns true. | |
848 virtual bool doHeapRegion(HeapRegion* r) = 0; | |
849 | |
850 // True after iteration if the closure was applied to all heap regions | |
851 // and returned "false" in all cases. | |
852 bool complete() { return _complete; } | |
853 }; | |
854 | |
855 #endif // SERIALGC | |
1972 | 856 |
857 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP |