Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/heapRegion.hpp @ 3920:af2ab04e0038
6929868: G1: introduce min / max young gen size bounds
Summary: Make G1 handle young gen size command line flags more consistently
Reviewed-by: tonyp, jwilhelm
author | brutisso |
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date | Thu, 08 Sep 2011 16:29:41 +0200 |
parents | f44782f04dd4 |
children | 4dfb2df418f2 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2011, 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 | |
3766 | 55 #define HR_FORMAT SIZE_FORMAT":(%s)["PTR_FORMAT","PTR_FORMAT","PTR_FORMAT"]" |
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 |
61 // A dirty card to oop closure for heap regions. It | |
62 // knows how to get the G1 heap and how to use the bitmap | |
63 // in the concurrent marker used by G1 to filter remembered | |
64 // sets. | |
65 | |
66 class HeapRegionDCTOC : public ContiguousSpaceDCTOC { | |
67 public: | |
68 // Specification of possible DirtyCardToOopClosure filtering. | |
69 enum FilterKind { | |
70 NoFilterKind, | |
71 IntoCSFilterKind, | |
72 OutOfRegionFilterKind | |
73 }; | |
74 | |
75 protected: | |
76 HeapRegion* _hr; | |
77 FilterKind _fk; | |
78 G1CollectedHeap* _g1; | |
79 | |
80 void walk_mem_region_with_cl(MemRegion mr, | |
81 HeapWord* bottom, HeapWord* top, | |
82 OopClosure* cl); | |
83 | |
84 // We don't specialize this for FilteringClosure; filtering is handled by | |
85 // the "FilterKind" mechanism. But we provide this to avoid a compiler | |
86 // warning. | |
87 void walk_mem_region_with_cl(MemRegion mr, | |
88 HeapWord* bottom, HeapWord* top, | |
89 FilteringClosure* cl) { | |
90 HeapRegionDCTOC::walk_mem_region_with_cl(mr, bottom, top, | |
91 (OopClosure*)cl); | |
92 } | |
93 | |
94 // Get the actual top of the area on which the closure will | |
95 // operate, given where the top is assumed to be (the end of the | |
96 // memory region passed to do_MemRegion) and where the object | |
97 // at the top is assumed to start. For example, an object may | |
98 // start at the top but actually extend past the assumed top, | |
99 // in which case the top becomes the end of the object. | |
100 HeapWord* get_actual_top(HeapWord* top, HeapWord* top_obj) { | |
101 return ContiguousSpaceDCTOC::get_actual_top(top, top_obj); | |
102 } | |
103 | |
104 // Walk the given memory region from bottom to (actual) top | |
105 // looking for objects and applying the oop closure (_cl) to | |
106 // them. The base implementation of this treats the area as | |
107 // blocks, where a block may or may not be an object. Sub- | |
108 // classes should override this to provide more accurate | |
109 // or possibly more efficient walking. | |
110 void walk_mem_region(MemRegion mr, HeapWord* bottom, HeapWord* top) { | |
111 Filtering_DCTOC::walk_mem_region(mr, bottom, top); | |
112 } | |
113 | |
114 public: | |
115 HeapRegionDCTOC(G1CollectedHeap* g1, | |
116 HeapRegion* hr, OopClosure* cl, | |
117 CardTableModRefBS::PrecisionStyle precision, | |
118 FilterKind fk); | |
119 }; | |
120 | |
121 | |
122 // The complicating factor is that BlockOffsetTable diverged | |
123 // significantly, and we need functionality that is only in the G1 version. | |
124 // So I copied that code, which led to an alternate G1 version of | |
125 // OffsetTableContigSpace. If the two versions of BlockOffsetTable could | |
126 // be reconciled, then G1OffsetTableContigSpace could go away. | |
127 | |
128 // The idea behind time stamps is the following. Doing a save_marks on | |
129 // all regions at every GC pause is time consuming (if I remember | |
130 // well, 10ms or so). So, we would like to do that only for regions | |
131 // that are GC alloc regions. To achieve this, we use time | |
132 // stamps. For every evacuation pause, G1CollectedHeap generates a | |
133 // unique time stamp (essentially a counter that gets | |
134 // incremented). Every time we want to call save_marks on a region, | |
135 // we set the saved_mark_word to top and also copy the current GC | |
136 // time stamp to the time stamp field of the space. Reading the | |
137 // saved_mark_word involves checking the time stamp of the | |
138 // region. If it is the same as the current GC time stamp, then we | |
139 // can safely read the saved_mark_word field, as it is valid. If the | |
140 // time stamp of the region is not the same as the current GC time | |
141 // stamp, then we instead read top, as the saved_mark_word field is | |
142 // invalid. Time stamps (on the regions and also on the | |
143 // G1CollectedHeap) are reset at every cleanup (we iterate over | |
144 // the regions anyway) and at the end of a Full GC. The current scheme | |
145 // that uses sequential unsigned ints will fail only if we have 4b | |
146 // evacuation pauses between two cleanups, which is _highly_ unlikely. | |
147 | |
148 class G1OffsetTableContigSpace: public ContiguousSpace { | |
149 friend class VMStructs; | |
150 protected: | |
151 G1BlockOffsetArrayContigSpace _offsets; | |
152 Mutex _par_alloc_lock; | |
153 volatile unsigned _gc_time_stamp; | |
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154 // When we need to retire an allocation region, while other threads |
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155 // are also concurrently trying to allocate into it, we typically |
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156 // allocate a dummy object at the end of the region to ensure that |
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157 // no more allocations can take place in it. However, sometimes we |
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158 // want to know where the end of the last "real" object we allocated |
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159 // into the region was and this is what this keeps track. |
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160 HeapWord* _pre_dummy_top; |
342 | 161 |
162 public: | |
163 // Constructor. If "is_zeroed" is true, the MemRegion "mr" may be | |
164 // assumed to contain zeros. | |
165 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
166 MemRegion mr, bool is_zeroed = false); | |
167 | |
168 void set_bottom(HeapWord* value); | |
169 void set_end(HeapWord* value); | |
170 | |
171 virtual HeapWord* saved_mark_word() const; | |
172 virtual void set_saved_mark(); | |
173 void reset_gc_time_stamp() { _gc_time_stamp = 0; } | |
174 | |
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175 // See the comment above in the declaration of _pre_dummy_top for an |
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176 // explanation of what it is. |
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177 void set_pre_dummy_top(HeapWord* pre_dummy_top) { |
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178 assert(is_in(pre_dummy_top) && pre_dummy_top <= top(), "pre-condition"); |
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179 _pre_dummy_top = pre_dummy_top; |
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180 } |
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181 HeapWord* pre_dummy_top() { |
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182 return (_pre_dummy_top == NULL) ? top() : _pre_dummy_top; |
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183 } |
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184 void reset_pre_dummy_top() { _pre_dummy_top = NULL; } |
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185 |
356 | 186 virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
187 virtual void clear(bool mangle_space); | |
342 | 188 |
189 HeapWord* block_start(const void* p); | |
190 HeapWord* block_start_const(const void* p) const; | |
191 | |
192 // Add offset table update. | |
193 virtual HeapWord* allocate(size_t word_size); | |
194 HeapWord* par_allocate(size_t word_size); | |
195 | |
196 // MarkSweep support phase3 | |
197 virtual HeapWord* initialize_threshold(); | |
198 virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* end); | |
199 | |
200 virtual void print() const; | |
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201 |
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202 void reset_bot() { |
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203 _offsets.zero_bottom_entry(); |
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204 _offsets.initialize_threshold(); |
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205 } |
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206 |
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207 void update_bot_for_object(HeapWord* start, size_t word_size) { |
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208 _offsets.alloc_block(start, word_size); |
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209 } |
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210 |
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211 void print_bot_on(outputStream* out) { |
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212 _offsets.print_on(out); |
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213 } |
342 | 214 }; |
215 | |
216 class HeapRegion: public G1OffsetTableContigSpace { | |
217 friend class VMStructs; | |
218 private: | |
219 | |
355 | 220 enum HumongousType { |
221 NotHumongous = 0, | |
222 StartsHumongous, | |
223 ContinuesHumongous | |
224 }; | |
225 | |
342 | 226 // The next filter kind that should be used for a "new_dcto_cl" call with |
227 // the "traditional" signature. | |
228 HeapRegionDCTOC::FilterKind _next_fk; | |
229 | |
230 // Requires that the region "mr" be dense with objects, and begin and end | |
231 // with an object. | |
232 void oops_in_mr_iterate(MemRegion mr, OopClosure* cl); | |
233 | |
234 // The remembered set for this region. | |
235 // (Might want to make this "inline" later, to avoid some alloc failure | |
236 // issues.) | |
237 HeapRegionRemSet* _rem_set; | |
238 | |
239 G1BlockOffsetArrayContigSpace* offsets() { return &_offsets; } | |
240 | |
241 protected: | |
3766 | 242 // The index of this region in the heap region sequence. |
243 size_t _hrs_index; | |
342 | 244 |
355 | 245 HumongousType _humongous_type; |
342 | 246 // For a humongous region, region in which it starts. |
247 HeapRegion* _humongous_start_region; | |
248 // For the start region of a humongous sequence, it's original end(). | |
249 HeapWord* _orig_end; | |
250 | |
251 // True iff the region is in current collection_set. | |
252 bool _in_collection_set; | |
253 | |
254 // True iff an attempt to evacuate an object in the region failed. | |
255 bool _evacuation_failed; | |
256 | |
257 // A heap region may be a member one of a number of special subsets, each | |
258 // represented as linked lists through the field below. Currently, these | |
259 // sets include: | |
260 // The collection set. | |
261 // The set of allocation regions used in a collection pause. | |
262 // Spaces that may contain gray objects. | |
263 HeapRegion* _next_in_special_set; | |
264 | |
265 // next region in the young "generation" region set | |
266 HeapRegion* _next_young_region; | |
267 | |
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268 // Next region whose cards need cleaning |
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269 HeapRegion* _next_dirty_cards_region; |
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270 |
2152 | 271 // Fields used by the HeapRegionSetBase class and subclasses. |
272 HeapRegion* _next; | |
273 #ifdef ASSERT | |
274 HeapRegionSetBase* _containing_set; | |
275 #endif // ASSERT | |
276 bool _pending_removal; | |
277 | |
342 | 278 // For parallel heapRegion traversal. |
279 jint _claimed; | |
280 | |
281 // We use concurrent marking to determine the amount of live data | |
282 // in each heap region. | |
283 size_t _prev_marked_bytes; // Bytes known to be live via last completed marking. | |
284 size_t _next_marked_bytes; // Bytes known to be live via in-progress marking. | |
285 | |
286 // See "sort_index" method. -1 means is not in the array. | |
287 int _sort_index; | |
288 | |
289 // <PREDICTION> | |
290 double _gc_efficiency; | |
291 // </PREDICTION> | |
292 | |
293 enum YoungType { | |
294 NotYoung, // a region is not young | |
295 Young, // a region is young | |
3766 | 296 Survivor // a region is young and it contains survivors |
342 | 297 }; |
298 | |
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299 volatile YoungType _young_type; |
342 | 300 int _young_index_in_cset; |
301 SurvRateGroup* _surv_rate_group; | |
302 int _age_index; | |
303 | |
304 // The start of the unmarked area. The unmarked area extends from this | |
305 // word until the top and/or end of the region, and is the part | |
306 // of the region for which no marking was done, i.e. objects may | |
307 // have been allocated in this part since the last mark phase. | |
308 // "prev" is the top at the start of the last completed marking. | |
309 // "next" is the top at the start of the in-progress marking (if any.) | |
310 HeapWord* _prev_top_at_mark_start; | |
311 HeapWord* _next_top_at_mark_start; | |
312 // If a collection pause is in progress, this is the top at the start | |
313 // of that pause. | |
314 | |
315 // We've counted the marked bytes of objects below here. | |
316 HeapWord* _top_at_conc_mark_count; | |
317 | |
318 void init_top_at_mark_start() { | |
319 assert(_prev_marked_bytes == 0 && | |
320 _next_marked_bytes == 0, | |
321 "Must be called after zero_marked_bytes."); | |
322 HeapWord* bot = bottom(); | |
323 _prev_top_at_mark_start = bot; | |
324 _next_top_at_mark_start = bot; | |
325 _top_at_conc_mark_count = bot; | |
326 } | |
327 | |
328 void set_young_type(YoungType new_type) { | |
329 //assert(_young_type != new_type, "setting the same type" ); | |
330 // TODO: add more assertions here | |
331 _young_type = new_type; | |
332 } | |
333 | |
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334 // Cached attributes used in the collection set policy information |
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335 |
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336 // The RSet length that was added to the total value |
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337 // for the collection set. |
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338 size_t _recorded_rs_length; |
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339 |
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340 // The predicted elapsed time that was added to total value |
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341 // for the collection set. |
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342 double _predicted_elapsed_time_ms; |
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343 |
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344 // The predicted number of bytes to copy that was added to |
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345 // the total value for the collection set. |
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346 size_t _predicted_bytes_to_copy; |
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347 |
342 | 348 public: |
349 // If "is_zeroed" is "true", the region "mr" can be assumed to contain zeros. | |
3766 | 350 HeapRegion(size_t hrs_index, |
351 G1BlockOffsetSharedArray* sharedOffsetArray, | |
342 | 352 MemRegion mr, bool is_zeroed); |
353 | |
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354 static int LogOfHRGrainBytes; |
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355 static int LogOfHRGrainWords; |
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356 // The normal type of these should be size_t. However, they used to |
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357 // be members of an enum before and they are assumed by the |
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358 // compilers to be ints. To avoid going and fixing all their uses, |
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359 // I'm declaring them as ints. I'm not anticipating heap region |
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360 // sizes to reach anywhere near 2g, so using an int here is safe. |
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361 static int GrainBytes; |
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362 static int GrainWords; |
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363 static int CardsPerRegion; |
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364 |
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365 // It sets up the heap region size (GrainBytes / GrainWords), as |
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366 // well as other related fields that are based on the heap region |
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367 // size (LogOfHRGrainBytes / LogOfHRGrainWords / |
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368 // CardsPerRegion). All those fields are considered constant |
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369 // throughout the JVM's execution, therefore they should only be set |
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370 // up once during initialization time. |
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371 static void setup_heap_region_size(uintx min_heap_size); |
342 | 372 |
355 | 373 enum ClaimValues { |
374 InitialClaimValue = 0, | |
375 FinalCountClaimValue = 1, | |
376 NoteEndClaimValue = 2, | |
390 | 377 ScrubRemSetClaimValue = 3, |
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378 ParVerifyClaimValue = 4, |
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379 RebuildRSClaimValue = 5 |
355 | 380 }; |
381 | |
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382 inline HeapWord* par_allocate_no_bot_updates(size_t word_size) { |
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383 assert(is_young(), "we can only skip BOT updates on young regions"); |
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384 return ContiguousSpace::par_allocate(word_size); |
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385 } |
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386 inline HeapWord* allocate_no_bot_updates(size_t word_size) { |
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387 assert(is_young(), "we can only skip BOT updates on young regions"); |
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388 return ContiguousSpace::allocate(word_size); |
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389 } |
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390 |
342 | 391 // If this region is a member of a HeapRegionSeq, the index in that |
392 // sequence, otherwise -1. | |
3766 | 393 size_t hrs_index() const { return _hrs_index; } |
342 | 394 |
395 // The number of bytes marked live in the region in the last marking phase. | |
396 size_t marked_bytes() { return _prev_marked_bytes; } | |
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397 size_t live_bytes() { |
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398 return (top() - prev_top_at_mark_start()) * HeapWordSize + marked_bytes(); |
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399 } |
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400 |
342 | 401 // The number of bytes counted in the next marking. |
402 size_t next_marked_bytes() { return _next_marked_bytes; } | |
403 // The number of bytes live wrt the next marking. | |
404 size_t next_live_bytes() { | |
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405 return |
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406 (top() - next_top_at_mark_start()) * HeapWordSize + next_marked_bytes(); |
342 | 407 } |
408 | |
409 // A lower bound on the amount of garbage bytes in the region. | |
410 size_t garbage_bytes() { | |
411 size_t used_at_mark_start_bytes = | |
412 (prev_top_at_mark_start() - bottom()) * HeapWordSize; | |
413 assert(used_at_mark_start_bytes >= marked_bytes(), | |
414 "Can't mark more than we have."); | |
415 return used_at_mark_start_bytes - marked_bytes(); | |
416 } | |
417 | |
418 // An upper bound on the number of live bytes in the region. | |
419 size_t max_live_bytes() { return used() - garbage_bytes(); } | |
420 | |
421 void add_to_marked_bytes(size_t incr_bytes) { | |
422 _next_marked_bytes = _next_marked_bytes + incr_bytes; | |
423 guarantee( _next_marked_bytes <= used(), "invariant" ); | |
424 } | |
425 | |
426 void zero_marked_bytes() { | |
427 _prev_marked_bytes = _next_marked_bytes = 0; | |
428 } | |
429 | |
355 | 430 bool isHumongous() const { return _humongous_type != NotHumongous; } |
431 bool startsHumongous() const { return _humongous_type == StartsHumongous; } | |
432 bool continuesHumongous() const { return _humongous_type == ContinuesHumongous; } | |
342 | 433 // For a humongous region, region in which it starts. |
434 HeapRegion* humongous_start_region() const { | |
435 return _humongous_start_region; | |
436 } | |
437 | |
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438 // Makes the current region be a "starts humongous" region, i.e., |
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439 // the first region in a series of one or more contiguous regions |
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440 // that will contain a single "humongous" object. The two parameters |
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441 // are as follows: |
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442 // |
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443 // new_top : The new value of the top field of this region which |
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444 // points to the end of the humongous object that's being |
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445 // allocated. If there is more than one region in the series, top |
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446 // will lie beyond this region's original end field and on the last |
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447 // region in the series. |
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448 // |
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449 // new_end : The new value of the end field of this region which |
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450 // points to the end of the last region in the series. If there is |
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451 // one region in the series (namely: this one) end will be the same |
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452 // as the original end of this region. |
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453 // |
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454 // Updating top and end as described above makes this region look as |
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455 // if it spans the entire space taken up by all the regions in the |
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456 // series and an single allocation moved its top to new_top. This |
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457 // ensures that the space (capacity / allocated) taken up by all |
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458 // humongous regions can be calculated by just looking at the |
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459 // "starts humongous" regions and by ignoring the "continues |
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460 // humongous" regions. |
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461 void set_startsHumongous(HeapWord* new_top, HeapWord* new_end); |
342 | 462 |
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463 // Makes the current region be a "continues humongous' |
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464 // region. first_hr is the "start humongous" region of the series |
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465 // which this region will be part of. |
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466 void set_continuesHumongous(HeapRegion* first_hr); |
342 | 467 |
2152 | 468 // Unsets the humongous-related fields on the region. |
469 void set_notHumongous(); | |
470 | |
342 | 471 // If the region has a remembered set, return a pointer to it. |
472 HeapRegionRemSet* rem_set() const { | |
473 return _rem_set; | |
474 } | |
475 | |
476 // True iff the region is in current collection_set. | |
477 bool in_collection_set() const { | |
478 return _in_collection_set; | |
479 } | |
480 void set_in_collection_set(bool b) { | |
481 _in_collection_set = b; | |
482 } | |
483 HeapRegion* next_in_collection_set() { | |
484 assert(in_collection_set(), "should only invoke on member of CS."); | |
485 assert(_next_in_special_set == NULL || | |
486 _next_in_special_set->in_collection_set(), | |
487 "Malformed CS."); | |
488 return _next_in_special_set; | |
489 } | |
490 void set_next_in_collection_set(HeapRegion* r) { | |
491 assert(in_collection_set(), "should only invoke on member of CS."); | |
492 assert(r == NULL || r->in_collection_set(), "Malformed CS."); | |
493 _next_in_special_set = r; | |
494 } | |
495 | |
2152 | 496 // Methods used by the HeapRegionSetBase class and subclasses. |
342 | 497 |
2152 | 498 // Getter and setter for the next field used to link regions into |
499 // linked lists. | |
500 HeapRegion* next() { return _next; } | |
501 | |
502 void set_next(HeapRegion* next) { _next = next; } | |
342 | 503 |
2152 | 504 // Every region added to a set is tagged with a reference to that |
505 // set. This is used for doing consistency checking to make sure that | |
506 // the contents of a set are as they should be and it's only | |
507 // available in non-product builds. | |
508 #ifdef ASSERT | |
509 void set_containing_set(HeapRegionSetBase* containing_set) { | |
510 assert((containing_set == NULL && _containing_set != NULL) || | |
511 (containing_set != NULL && _containing_set == NULL), | |
512 err_msg("containing_set: "PTR_FORMAT" " | |
513 "_containing_set: "PTR_FORMAT, | |
514 containing_set, _containing_set)); | |
515 | |
516 _containing_set = containing_set; | |
2361 | 517 } |
342 | 518 |
2152 | 519 HeapRegionSetBase* containing_set() { return _containing_set; } |
520 #else // ASSERT | |
521 void set_containing_set(HeapRegionSetBase* containing_set) { } | |
342 | 522 |
2361 | 523 // containing_set() is only used in asserts so there's no reason |
2152 | 524 // to provide a dummy version of it. |
525 #endif // ASSERT | |
342 | 526 |
2152 | 527 // If we want to remove regions from a list in bulk we can simply tag |
528 // them with the pending_removal tag and call the | |
529 // remove_all_pending() method on the list. | |
342 | 530 |
2152 | 531 bool pending_removal() { return _pending_removal; } |
532 | |
533 void set_pending_removal(bool pending_removal) { | |
2361 | 534 if (pending_removal) { |
535 assert(!_pending_removal && containing_set() != NULL, | |
536 "can only set pending removal to true if it's false and " | |
537 "the region belongs to a region set"); | |
538 } else { | |
539 assert( _pending_removal && containing_set() == NULL, | |
540 "can only set pending removal to false if it's true and " | |
541 "the region does not belong to a region set"); | |
542 } | |
2152 | 543 |
544 _pending_removal = pending_removal; | |
342 | 545 } |
546 | |
547 HeapRegion* get_next_young_region() { return _next_young_region; } | |
548 void set_next_young_region(HeapRegion* hr) { | |
549 _next_young_region = hr; | |
550 } | |
551 | |
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552 HeapRegion* get_next_dirty_cards_region() const { return _next_dirty_cards_region; } |
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553 HeapRegion** next_dirty_cards_region_addr() { return &_next_dirty_cards_region; } |
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554 void set_next_dirty_cards_region(HeapRegion* hr) { _next_dirty_cards_region = hr; } |
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555 bool is_on_dirty_cards_region_list() const { return get_next_dirty_cards_region() != NULL; } |
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556 |
3766 | 557 HeapWord* orig_end() { return _orig_end; } |
558 | |
342 | 559 // Allows logical separation between objects allocated before and after. |
560 void save_marks(); | |
561 | |
562 // Reset HR stuff to default values. | |
563 void hr_clear(bool par, bool clear_space); | |
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564 void par_clear(); |
342 | 565 |
356 | 566 void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
342 | 567 |
568 // Get the start of the unmarked area in this region. | |
569 HeapWord* prev_top_at_mark_start() const { return _prev_top_at_mark_start; } | |
570 HeapWord* next_top_at_mark_start() const { return _next_top_at_mark_start; } | |
571 | |
572 // Apply "cl->do_oop" to (the addresses of) all reference fields in objects | |
573 // allocated in the current region before the last call to "save_mark". | |
574 void oop_before_save_marks_iterate(OopClosure* cl); | |
575 | |
576 // This call determines the "filter kind" argument that will be used for | |
577 // the next call to "new_dcto_cl" on this region with the "traditional" | |
578 // signature (i.e., the call below.) The default, in the absence of a | |
579 // preceding call to this method, is "NoFilterKind", and a call to this | |
580 // method is necessary for each such call, or else it reverts to the | |
581 // default. | |
582 // (This is really ugly, but all other methods I could think of changed a | |
583 // lot of main-line code for G1.) | |
584 void set_next_filter_kind(HeapRegionDCTOC::FilterKind nfk) { | |
585 _next_fk = nfk; | |
586 } | |
587 | |
588 DirtyCardToOopClosure* | |
589 new_dcto_closure(OopClosure* cl, | |
590 CardTableModRefBS::PrecisionStyle precision, | |
591 HeapRegionDCTOC::FilterKind fk); | |
592 | |
593 #if WHASSUP | |
594 DirtyCardToOopClosure* | |
595 new_dcto_closure(OopClosure* cl, | |
596 CardTableModRefBS::PrecisionStyle precision, | |
597 HeapWord* boundary) { | |
598 assert(boundary == NULL, "This arg doesn't make sense here."); | |
599 DirtyCardToOopClosure* res = new_dcto_closure(cl, precision, _next_fk); | |
600 _next_fk = HeapRegionDCTOC::NoFilterKind; | |
601 return res; | |
602 } | |
603 #endif | |
604 | |
605 // | |
606 // Note the start or end of marking. This tells the heap region | |
607 // that the collector is about to start or has finished (concurrently) | |
608 // marking the heap. | |
609 // | |
610 | |
611 // Note the start of a marking phase. Record the | |
612 // start of the unmarked area of the region here. | |
613 void note_start_of_marking(bool during_initial_mark) { | |
614 init_top_at_conc_mark_count(); | |
615 _next_marked_bytes = 0; | |
616 if (during_initial_mark && is_young() && !is_survivor()) | |
617 _next_top_at_mark_start = bottom(); | |
618 else | |
619 _next_top_at_mark_start = top(); | |
620 } | |
621 | |
622 // Note the end of a marking phase. Install the start of | |
623 // the unmarked area that was captured at start of marking. | |
624 void note_end_of_marking() { | |
625 _prev_top_at_mark_start = _next_top_at_mark_start; | |
626 _prev_marked_bytes = _next_marked_bytes; | |
627 _next_marked_bytes = 0; | |
628 | |
629 guarantee(_prev_marked_bytes <= | |
630 (size_t) (prev_top_at_mark_start() - bottom()) * HeapWordSize, | |
631 "invariant"); | |
632 } | |
633 | |
634 // After an evacuation, we need to update _next_top_at_mark_start | |
635 // to be the current top. Note this is only valid if we have only | |
636 // ever evacuated into this region. If we evacuate, allocate, and | |
637 // then evacuate we are in deep doodoo. | |
638 void note_end_of_copying() { | |
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639 assert(top() >= _next_top_at_mark_start, "Increase only"); |
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640 _next_top_at_mark_start = top(); |
342 | 641 } |
642 | |
643 // Returns "false" iff no object in the region was allocated when the | |
644 // last mark phase ended. | |
645 bool is_marked() { return _prev_top_at_mark_start != bottom(); } | |
646 | |
647 // If "is_marked()" is true, then this is the index of the region in | |
648 // an array constructed at the end of marking of the regions in a | |
649 // "desirability" order. | |
650 int sort_index() { | |
651 return _sort_index; | |
652 } | |
653 void set_sort_index(int i) { | |
654 _sort_index = i; | |
655 } | |
656 | |
657 void init_top_at_conc_mark_count() { | |
658 _top_at_conc_mark_count = bottom(); | |
659 } | |
660 | |
661 void set_top_at_conc_mark_count(HeapWord *cur) { | |
662 assert(bottom() <= cur && cur <= end(), "Sanity."); | |
663 _top_at_conc_mark_count = cur; | |
664 } | |
665 | |
666 HeapWord* top_at_conc_mark_count() { | |
667 return _top_at_conc_mark_count; | |
668 } | |
669 | |
670 void reset_during_compaction() { | |
671 guarantee( isHumongous() && startsHumongous(), | |
672 "should only be called for humongous regions"); | |
673 | |
674 zero_marked_bytes(); | |
675 init_top_at_mark_start(); | |
676 } | |
677 | |
678 // <PREDICTION> | |
679 void calc_gc_efficiency(void); | |
680 double gc_efficiency() { return _gc_efficiency;} | |
681 // </PREDICTION> | |
682 | |
683 bool is_young() const { return _young_type != NotYoung; } | |
684 bool is_survivor() const { return _young_type == Survivor; } | |
685 | |
686 int young_index_in_cset() const { return _young_index_in_cset; } | |
687 void set_young_index_in_cset(int index) { | |
688 assert( (index == -1) || is_young(), "pre-condition" ); | |
689 _young_index_in_cset = index; | |
690 } | |
691 | |
692 int age_in_surv_rate_group() { | |
693 assert( _surv_rate_group != NULL, "pre-condition" ); | |
694 assert( _age_index > -1, "pre-condition" ); | |
695 return _surv_rate_group->age_in_group(_age_index); | |
696 } | |
697 | |
698 void record_surv_words_in_group(size_t words_survived) { | |
699 assert( _surv_rate_group != NULL, "pre-condition" ); | |
700 assert( _age_index > -1, "pre-condition" ); | |
701 int age_in_group = age_in_surv_rate_group(); | |
702 _surv_rate_group->record_surviving_words(age_in_group, words_survived); | |
703 } | |
704 | |
705 int age_in_surv_rate_group_cond() { | |
706 if (_surv_rate_group != NULL) | |
707 return age_in_surv_rate_group(); | |
708 else | |
709 return -1; | |
710 } | |
711 | |
712 SurvRateGroup* surv_rate_group() { | |
713 return _surv_rate_group; | |
714 } | |
715 | |
716 void install_surv_rate_group(SurvRateGroup* surv_rate_group) { | |
717 assert( surv_rate_group != NULL, "pre-condition" ); | |
718 assert( _surv_rate_group == NULL, "pre-condition" ); | |
719 assert( is_young(), "pre-condition" ); | |
720 | |
721 _surv_rate_group = surv_rate_group; | |
722 _age_index = surv_rate_group->next_age_index(); | |
723 } | |
724 | |
725 void uninstall_surv_rate_group() { | |
726 if (_surv_rate_group != NULL) { | |
727 assert( _age_index > -1, "pre-condition" ); | |
728 assert( is_young(), "pre-condition" ); | |
729 | |
730 _surv_rate_group = NULL; | |
731 _age_index = -1; | |
732 } else { | |
733 assert( _age_index == -1, "pre-condition" ); | |
734 } | |
735 } | |
736 | |
737 void set_young() { set_young_type(Young); } | |
738 | |
739 void set_survivor() { set_young_type(Survivor); } | |
740 | |
741 void set_not_young() { set_young_type(NotYoung); } | |
742 | |
743 // Determine if an object has been allocated since the last | |
744 // mark performed by the collector. This returns true iff the object | |
745 // is within the unmarked area of the region. | |
746 bool obj_allocated_since_prev_marking(oop obj) const { | |
747 return (HeapWord *) obj >= prev_top_at_mark_start(); | |
748 } | |
749 bool obj_allocated_since_next_marking(oop obj) const { | |
750 return (HeapWord *) obj >= next_top_at_mark_start(); | |
751 } | |
752 | |
753 // For parallel heapRegion traversal. | |
754 bool claimHeapRegion(int claimValue); | |
755 jint claim_value() { return _claimed; } | |
756 // Use this carefully: only when you're sure no one is claiming... | |
757 void set_claim_value(int claimValue) { _claimed = claimValue; } | |
758 | |
759 // Returns the "evacuation_failed" property of the region. | |
760 bool evacuation_failed() { return _evacuation_failed; } | |
761 | |
762 // Sets the "evacuation_failed" property of the region. | |
763 void set_evacuation_failed(bool b) { | |
764 _evacuation_failed = b; | |
765 | |
766 if (b) { | |
767 init_top_at_conc_mark_count(); | |
768 _next_marked_bytes = 0; | |
769 } | |
770 } | |
771 | |
772 // Requires that "mr" be entirely within the region. | |
773 // Apply "cl->do_object" to all objects that intersect with "mr". | |
774 // If the iteration encounters an unparseable portion of the region, | |
775 // or if "cl->abort()" is true after a closure application, | |
776 // terminate the iteration and return the address of the start of the | |
777 // subregion that isn't done. (The two can be distinguished by querying | |
778 // "cl->abort()".) Return of "NULL" indicates that the iteration | |
779 // completed. | |
780 HeapWord* | |
781 object_iterate_mem_careful(MemRegion mr, ObjectClosure* cl); | |
782 | |
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783 // filter_young: if true and the region is a young region then we |
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784 // skip the iteration. |
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785 // card_ptr: if not NULL, and we decide that the card is not young |
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786 // and we iterate over it, we'll clean the card before we start the |
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787 // iteration. |
342 | 788 HeapWord* |
789 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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790 FilterOutOfRegionClosure* cl, |
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791 bool filter_young, |
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792 jbyte* card_ptr); |
342 | 793 |
794 // A version of block start that is guaranteed to find *some* block | |
795 // boundary at or before "p", but does not object iteration, and may | |
796 // therefore be used safely when the heap is unparseable. | |
797 HeapWord* block_start_careful(const void* p) const { | |
798 return _offsets.block_start_careful(p); | |
799 } | |
800 | |
801 // Requires that "addr" is within the region. Returns the start of the | |
802 // first ("careful") block that starts at or after "addr", or else the | |
803 // "end" of the region if there is no such block. | |
804 HeapWord* next_block_start_careful(HeapWord* addr); | |
805 | |
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806 size_t recorded_rs_length() const { return _recorded_rs_length; } |
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807 double predicted_elapsed_time_ms() const { return _predicted_elapsed_time_ms; } |
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808 size_t predicted_bytes_to_copy() const { return _predicted_bytes_to_copy; } |
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809 |
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810 void set_recorded_rs_length(size_t rs_length) { |
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811 _recorded_rs_length = rs_length; |
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812 } |
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813 |
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814 void set_predicted_elapsed_time_ms(double ms) { |
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815 _predicted_elapsed_time_ms = ms; |
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816 } |
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817 |
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818 void set_predicted_bytes_to_copy(size_t bytes) { |
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819 _predicted_bytes_to_copy = bytes; |
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820 } |
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821 |
342 | 822 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \ |
823 virtual void oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl); | |
824 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DECL) | |
825 | |
826 CompactibleSpace* next_compaction_space() const; | |
827 | |
828 virtual void reset_after_compaction(); | |
829 | |
830 void print() const; | |
831 void print_on(outputStream* st) const; | |
832 | |
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833 // vo == UsePrevMarking -> use "prev" marking information, |
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834 // vo == UseNextMarking -> use "next" marking information |
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835 // vo == UseMarkWord -> use the mark word in the object header |
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836 // |
811 | 837 // NOTE: Only the "prev" marking information is guaranteed to be |
838 // consistent most of the time, so most calls to this should use | |
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839 // vo == UsePrevMarking. |
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840 // Currently, there is only one case where this is called with |
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841 // vo == UseNextMarking, which is to verify the "next" marking |
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842 // information at the end of remark. |
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843 // Currently there is only one place where this is called with |
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844 // vo == UseMarkWord, which is to verify the marking during a |
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845 // full GC. |
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846 void verify(bool allow_dirty, VerifyOption vo, bool *failures) const; |
811 | 847 |
848 // Override; it uses the "prev" marking information | |
342 | 849 virtual void verify(bool allow_dirty) const; |
850 }; | |
851 | |
852 // HeapRegionClosure is used for iterating over regions. | |
853 // Terminates the iteration when the "doHeapRegion" method returns "true". | |
854 class HeapRegionClosure : public StackObj { | |
855 friend class HeapRegionSeq; | |
856 friend class G1CollectedHeap; | |
857 | |
858 bool _complete; | |
859 void incomplete() { _complete = false; } | |
860 | |
861 public: | |
862 HeapRegionClosure(): _complete(true) {} | |
863 | |
864 // Typically called on each region until it returns true. | |
865 virtual bool doHeapRegion(HeapRegion* r) = 0; | |
866 | |
867 // True after iteration if the closure was applied to all heap regions | |
868 // and returned "false" in all cases. | |
869 bool complete() { return _complete; } | |
870 }; | |
871 | |
872 #endif // SERIALGC | |
1972 | 873 |
874 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP |