Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/heapRegion.hpp @ 2134:b158bed62ef5
6994297: G1: do first-level slow-path allocations with a CAS
Summary: First attempt to allocate out the current alloc region using a CAS instead of taking the Heap_lock (first level of G1's slow allocation path). Only if that fails and it's necessary to replace the current alloc region take the Heap_lock (that's the second level of G1's slow allocation path).
Reviewed-by: johnc, brutisso, ysr
author | tonyp |
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date | Wed, 12 Jan 2011 16:34:25 -0500 |
parents | 2250ee17e258 |
children | 0fa27f37d4d4 |
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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; | |
53 | |
54 // A dirty card to oop closure for heap regions. It | |
55 // knows how to get the G1 heap and how to use the bitmap | |
56 // in the concurrent marker used by G1 to filter remembered | |
57 // sets. | |
58 | |
59 class HeapRegionDCTOC : public ContiguousSpaceDCTOC { | |
60 public: | |
61 // Specification of possible DirtyCardToOopClosure filtering. | |
62 enum FilterKind { | |
63 NoFilterKind, | |
64 IntoCSFilterKind, | |
65 OutOfRegionFilterKind | |
66 }; | |
67 | |
68 protected: | |
69 HeapRegion* _hr; | |
70 FilterKind _fk; | |
71 G1CollectedHeap* _g1; | |
72 | |
73 void walk_mem_region_with_cl(MemRegion mr, | |
74 HeapWord* bottom, HeapWord* top, | |
75 OopClosure* cl); | |
76 | |
77 // We don't specialize this for FilteringClosure; filtering is handled by | |
78 // the "FilterKind" mechanism. But we provide this to avoid a compiler | |
79 // warning. | |
80 void walk_mem_region_with_cl(MemRegion mr, | |
81 HeapWord* bottom, HeapWord* top, | |
82 FilteringClosure* cl) { | |
83 HeapRegionDCTOC::walk_mem_region_with_cl(mr, bottom, top, | |
84 (OopClosure*)cl); | |
85 } | |
86 | |
87 // Get the actual top of the area on which the closure will | |
88 // operate, given where the top is assumed to be (the end of the | |
89 // memory region passed to do_MemRegion) and where the object | |
90 // at the top is assumed to start. For example, an object may | |
91 // start at the top but actually extend past the assumed top, | |
92 // in which case the top becomes the end of the object. | |
93 HeapWord* get_actual_top(HeapWord* top, HeapWord* top_obj) { | |
94 return ContiguousSpaceDCTOC::get_actual_top(top, top_obj); | |
95 } | |
96 | |
97 // Walk the given memory region from bottom to (actual) top | |
98 // looking for objects and applying the oop closure (_cl) to | |
99 // them. The base implementation of this treats the area as | |
100 // blocks, where a block may or may not be an object. Sub- | |
101 // classes should override this to provide more accurate | |
102 // or possibly more efficient walking. | |
103 void walk_mem_region(MemRegion mr, HeapWord* bottom, HeapWord* top) { | |
104 Filtering_DCTOC::walk_mem_region(mr, bottom, top); | |
105 } | |
106 | |
107 public: | |
108 HeapRegionDCTOC(G1CollectedHeap* g1, | |
109 HeapRegion* hr, OopClosure* cl, | |
110 CardTableModRefBS::PrecisionStyle precision, | |
111 FilterKind fk); | |
112 }; | |
113 | |
114 | |
115 // The complicating factor is that BlockOffsetTable diverged | |
116 // significantly, and we need functionality that is only in the G1 version. | |
117 // So I copied that code, which led to an alternate G1 version of | |
118 // OffsetTableContigSpace. If the two versions of BlockOffsetTable could | |
119 // be reconciled, then G1OffsetTableContigSpace could go away. | |
120 | |
121 // The idea behind time stamps is the following. Doing a save_marks on | |
122 // all regions at every GC pause is time consuming (if I remember | |
123 // well, 10ms or so). So, we would like to do that only for regions | |
124 // that are GC alloc regions. To achieve this, we use time | |
125 // stamps. For every evacuation pause, G1CollectedHeap generates a | |
126 // unique time stamp (essentially a counter that gets | |
127 // incremented). Every time we want to call save_marks on a region, | |
128 // we set the saved_mark_word to top and also copy the current GC | |
129 // time stamp to the time stamp field of the space. Reading the | |
130 // saved_mark_word involves checking the time stamp of the | |
131 // region. If it is the same as the current GC time stamp, then we | |
132 // can safely read the saved_mark_word field, as it is valid. If the | |
133 // time stamp of the region is not the same as the current GC time | |
134 // stamp, then we instead read top, as the saved_mark_word field is | |
135 // invalid. Time stamps (on the regions and also on the | |
136 // G1CollectedHeap) are reset at every cleanup (we iterate over | |
137 // the regions anyway) and at the end of a Full GC. The current scheme | |
138 // that uses sequential unsigned ints will fail only if we have 4b | |
139 // evacuation pauses between two cleanups, which is _highly_ unlikely. | |
140 | |
141 class G1OffsetTableContigSpace: public ContiguousSpace { | |
142 friend class VMStructs; | |
143 protected: | |
144 G1BlockOffsetArrayContigSpace _offsets; | |
145 Mutex _par_alloc_lock; | |
146 volatile unsigned _gc_time_stamp; | |
147 | |
148 public: | |
149 // Constructor. If "is_zeroed" is true, the MemRegion "mr" may be | |
150 // assumed to contain zeros. | |
151 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
152 MemRegion mr, bool is_zeroed = false); | |
153 | |
154 void set_bottom(HeapWord* value); | |
155 void set_end(HeapWord* value); | |
156 | |
157 virtual HeapWord* saved_mark_word() const; | |
158 virtual void set_saved_mark(); | |
159 void reset_gc_time_stamp() { _gc_time_stamp = 0; } | |
160 | |
356 | 161 virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
162 virtual void clear(bool mangle_space); | |
342 | 163 |
164 HeapWord* block_start(const void* p); | |
165 HeapWord* block_start_const(const void* p) const; | |
166 | |
167 // Add offset table update. | |
168 virtual HeapWord* allocate(size_t word_size); | |
169 HeapWord* par_allocate(size_t word_size); | |
170 | |
171 // MarkSweep support phase3 | |
172 virtual HeapWord* initialize_threshold(); | |
173 virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* end); | |
174 | |
175 virtual void print() const; | |
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176 |
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177 void reset_bot() { |
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178 _offsets.zero_bottom_entry(); |
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179 _offsets.initialize_threshold(); |
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180 } |
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181 |
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182 void update_bot_for_object(HeapWord* start, size_t word_size) { |
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183 _offsets.alloc_block(start, word_size); |
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184 } |
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185 |
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186 void print_bot_on(outputStream* out) { |
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187 _offsets.print_on(out); |
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188 } |
342 | 189 }; |
190 | |
191 class HeapRegion: public G1OffsetTableContigSpace { | |
192 friend class VMStructs; | |
193 private: | |
194 | |
355 | 195 enum HumongousType { |
196 NotHumongous = 0, | |
197 StartsHumongous, | |
198 ContinuesHumongous | |
199 }; | |
200 | |
342 | 201 // The next filter kind that should be used for a "new_dcto_cl" call with |
202 // the "traditional" signature. | |
203 HeapRegionDCTOC::FilterKind _next_fk; | |
204 | |
205 // Requires that the region "mr" be dense with objects, and begin and end | |
206 // with an object. | |
207 void oops_in_mr_iterate(MemRegion mr, OopClosure* cl); | |
208 | |
209 // The remembered set for this region. | |
210 // (Might want to make this "inline" later, to avoid some alloc failure | |
211 // issues.) | |
212 HeapRegionRemSet* _rem_set; | |
213 | |
214 G1BlockOffsetArrayContigSpace* offsets() { return &_offsets; } | |
215 | |
216 protected: | |
217 // If this region is a member of a HeapRegionSeq, the index in that | |
218 // sequence, otherwise -1. | |
219 int _hrs_index; | |
220 | |
355 | 221 HumongousType _humongous_type; |
342 | 222 // For a humongous region, region in which it starts. |
223 HeapRegion* _humongous_start_region; | |
224 // For the start region of a humongous sequence, it's original end(). | |
225 HeapWord* _orig_end; | |
226 | |
227 // True iff the region is in current collection_set. | |
228 bool _in_collection_set; | |
229 | |
230 // True iff the region is on the unclean list, waiting to be zero filled. | |
231 bool _is_on_unclean_list; | |
232 | |
233 // True iff the region is on the free list, ready for allocation. | |
234 bool _is_on_free_list; | |
235 | |
236 // Is this or has it been an allocation region in the current collection | |
237 // pause. | |
238 bool _is_gc_alloc_region; | |
239 | |
240 // True iff an attempt to evacuate an object in the region failed. | |
241 bool _evacuation_failed; | |
242 | |
243 // A heap region may be a member one of a number of special subsets, each | |
244 // represented as linked lists through the field below. Currently, these | |
245 // sets include: | |
246 // The collection set. | |
247 // The set of allocation regions used in a collection pause. | |
248 // Spaces that may contain gray objects. | |
249 HeapRegion* _next_in_special_set; | |
250 | |
251 // next region in the young "generation" region set | |
252 HeapRegion* _next_young_region; | |
253 | |
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254 // Next region whose cards need cleaning |
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255 HeapRegion* _next_dirty_cards_region; |
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256 |
342 | 257 // For parallel heapRegion traversal. |
258 jint _claimed; | |
259 | |
260 // We use concurrent marking to determine the amount of live data | |
261 // in each heap region. | |
262 size_t _prev_marked_bytes; // Bytes known to be live via last completed marking. | |
263 size_t _next_marked_bytes; // Bytes known to be live via in-progress marking. | |
264 | |
265 // See "sort_index" method. -1 means is not in the array. | |
266 int _sort_index; | |
267 | |
268 // <PREDICTION> | |
269 double _gc_efficiency; | |
270 // </PREDICTION> | |
271 | |
272 enum YoungType { | |
273 NotYoung, // a region is not young | |
274 Young, // a region is young | |
275 Survivor // a region is young and it contains | |
276 // survivor | |
277 }; | |
278 | |
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279 volatile YoungType _young_type; |
342 | 280 int _young_index_in_cset; |
281 SurvRateGroup* _surv_rate_group; | |
282 int _age_index; | |
283 | |
284 // The start of the unmarked area. The unmarked area extends from this | |
285 // word until the top and/or end of the region, and is the part | |
286 // of the region for which no marking was done, i.e. objects may | |
287 // have been allocated in this part since the last mark phase. | |
288 // "prev" is the top at the start of the last completed marking. | |
289 // "next" is the top at the start of the in-progress marking (if any.) | |
290 HeapWord* _prev_top_at_mark_start; | |
291 HeapWord* _next_top_at_mark_start; | |
292 // If a collection pause is in progress, this is the top at the start | |
293 // of that pause. | |
294 | |
295 // We've counted the marked bytes of objects below here. | |
296 HeapWord* _top_at_conc_mark_count; | |
297 | |
298 void init_top_at_mark_start() { | |
299 assert(_prev_marked_bytes == 0 && | |
300 _next_marked_bytes == 0, | |
301 "Must be called after zero_marked_bytes."); | |
302 HeapWord* bot = bottom(); | |
303 _prev_top_at_mark_start = bot; | |
304 _next_top_at_mark_start = bot; | |
305 _top_at_conc_mark_count = bot; | |
306 } | |
307 | |
308 jint _zfs; // A member of ZeroFillState. Protected by ZF_lock. | |
309 Thread* _zero_filler; // If _zfs is ZeroFilling, the thread that (last) | |
310 // made it so. | |
311 | |
312 void set_young_type(YoungType new_type) { | |
313 //assert(_young_type != new_type, "setting the same type" ); | |
314 // TODO: add more assertions here | |
315 _young_type = new_type; | |
316 } | |
317 | |
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318 // Cached attributes used in the collection set policy information |
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319 |
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320 // The RSet length that was added to the total value |
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321 // for the collection set. |
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322 size_t _recorded_rs_length; |
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323 |
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324 // The predicted elapsed time that was added to total value |
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325 // for the collection set. |
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326 double _predicted_elapsed_time_ms; |
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327 |
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328 // The predicted number of bytes to copy that was added to |
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329 // the total value for the collection set. |
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330 size_t _predicted_bytes_to_copy; |
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331 |
342 | 332 public: |
333 // If "is_zeroed" is "true", the region "mr" can be assumed to contain zeros. | |
334 HeapRegion(G1BlockOffsetSharedArray* sharedOffsetArray, | |
335 MemRegion mr, bool is_zeroed); | |
336 | |
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337 static int LogOfHRGrainBytes; |
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338 static int LogOfHRGrainWords; |
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339 // The normal type of these should be size_t. However, they used to |
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340 // be members of an enum before and they are assumed by the |
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341 // compilers to be ints. To avoid going and fixing all their uses, |
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342 // I'm declaring them as ints. I'm not anticipating heap region |
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343 // sizes to reach anywhere near 2g, so using an int here is safe. |
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344 static int GrainBytes; |
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345 static int GrainWords; |
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346 static int CardsPerRegion; |
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347 |
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348 // It sets up the heap region size (GrainBytes / GrainWords), as |
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349 // well as other related fields that are based on the heap region |
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350 // size (LogOfHRGrainBytes / LogOfHRGrainWords / |
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351 // CardsPerRegion). All those fields are considered constant |
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352 // throughout the JVM's execution, therefore they should only be set |
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353 // up once during initialization time. |
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354 static void setup_heap_region_size(uintx min_heap_size); |
342 | 355 |
355 | 356 enum ClaimValues { |
357 InitialClaimValue = 0, | |
358 FinalCountClaimValue = 1, | |
359 NoteEndClaimValue = 2, | |
390 | 360 ScrubRemSetClaimValue = 3, |
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361 ParVerifyClaimValue = 4, |
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362 RebuildRSClaimValue = 5 |
355 | 363 }; |
364 | |
342 | 365 // Concurrent refinement requires contiguous heap regions (in which TLABs |
366 // might be allocated) to be zero-filled. Each region therefore has a | |
367 // zero-fill-state. | |
368 enum ZeroFillState { | |
369 NotZeroFilled, | |
370 ZeroFilling, | |
371 ZeroFilled, | |
372 Allocated | |
373 }; | |
374 | |
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375 inline HeapWord* par_allocate_no_bot_updates(size_t word_size) { |
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376 assert(is_young(), "we can only skip BOT updates on young regions"); |
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377 return ContiguousSpace::par_allocate(word_size); |
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378 } |
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379 inline HeapWord* allocate_no_bot_updates(size_t word_size) { |
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380 assert(is_young(), "we can only skip BOT updates on young regions"); |
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381 return ContiguousSpace::allocate(word_size); |
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382 } |
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383 |
342 | 384 // If this region is a member of a HeapRegionSeq, the index in that |
385 // sequence, otherwise -1. | |
386 int hrs_index() const { return _hrs_index; } | |
387 void set_hrs_index(int index) { _hrs_index = index; } | |
388 | |
389 // The number of bytes marked live in the region in the last marking phase. | |
390 size_t marked_bytes() { return _prev_marked_bytes; } | |
391 // The number of bytes counted in the next marking. | |
392 size_t next_marked_bytes() { return _next_marked_bytes; } | |
393 // The number of bytes live wrt the next marking. | |
394 size_t next_live_bytes() { | |
395 return (top() - next_top_at_mark_start()) | |
396 * HeapWordSize | |
397 + next_marked_bytes(); | |
398 } | |
399 | |
400 // A lower bound on the amount of garbage bytes in the region. | |
401 size_t garbage_bytes() { | |
402 size_t used_at_mark_start_bytes = | |
403 (prev_top_at_mark_start() - bottom()) * HeapWordSize; | |
404 assert(used_at_mark_start_bytes >= marked_bytes(), | |
405 "Can't mark more than we have."); | |
406 return used_at_mark_start_bytes - marked_bytes(); | |
407 } | |
408 | |
409 // An upper bound on the number of live bytes in the region. | |
410 size_t max_live_bytes() { return used() - garbage_bytes(); } | |
411 | |
412 void add_to_marked_bytes(size_t incr_bytes) { | |
413 _next_marked_bytes = _next_marked_bytes + incr_bytes; | |
414 guarantee( _next_marked_bytes <= used(), "invariant" ); | |
415 } | |
416 | |
417 void zero_marked_bytes() { | |
418 _prev_marked_bytes = _next_marked_bytes = 0; | |
419 } | |
420 | |
355 | 421 bool isHumongous() const { return _humongous_type != NotHumongous; } |
422 bool startsHumongous() const { return _humongous_type == StartsHumongous; } | |
423 bool continuesHumongous() const { return _humongous_type == ContinuesHumongous; } | |
342 | 424 // For a humongous region, region in which it starts. |
425 HeapRegion* humongous_start_region() const { | |
426 return _humongous_start_region; | |
427 } | |
428 | |
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429 // Makes the current region be a "starts humongous" region, i.e., |
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430 // the first region in a series of one or more contiguous regions |
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431 // that will contain a single "humongous" object. The two parameters |
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432 // are as follows: |
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433 // |
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434 // new_top : The new value of the top field of this region which |
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435 // points to the end of the humongous object that's being |
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436 // allocated. If there is more than one region in the series, top |
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437 // will lie beyond this region's original end field and on the last |
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438 // region in the series. |
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439 // |
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440 // new_end : The new value of the end field of this region which |
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441 // points to the end of the last region in the series. If there is |
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442 // one region in the series (namely: this one) end will be the same |
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443 // as the original end of this region. |
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444 // |
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445 // Updating top and end as described above makes this region look as |
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446 // if it spans the entire space taken up by all the regions in the |
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447 // series and an single allocation moved its top to new_top. This |
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448 // ensures that the space (capacity / allocated) taken up by all |
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449 // humongous regions can be calculated by just looking at the |
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450 // "starts humongous" regions and by ignoring the "continues |
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451 // humongous" regions. |
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452 void set_startsHumongous(HeapWord* new_top, HeapWord* new_end); |
342 | 453 |
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454 // Makes the current region be a "continues humongous' |
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455 // region. first_hr is the "start humongous" region of the series |
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456 // which this region will be part of. |
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457 void set_continuesHumongous(HeapRegion* first_hr); |
342 | 458 |
459 // If the region has a remembered set, return a pointer to it. | |
460 HeapRegionRemSet* rem_set() const { | |
461 return _rem_set; | |
462 } | |
463 | |
464 // True iff the region is in current collection_set. | |
465 bool in_collection_set() const { | |
466 return _in_collection_set; | |
467 } | |
468 void set_in_collection_set(bool b) { | |
469 _in_collection_set = b; | |
470 } | |
471 HeapRegion* next_in_collection_set() { | |
472 assert(in_collection_set(), "should only invoke on member of CS."); | |
473 assert(_next_in_special_set == NULL || | |
474 _next_in_special_set->in_collection_set(), | |
475 "Malformed CS."); | |
476 return _next_in_special_set; | |
477 } | |
478 void set_next_in_collection_set(HeapRegion* r) { | |
479 assert(in_collection_set(), "should only invoke on member of CS."); | |
480 assert(r == NULL || r->in_collection_set(), "Malformed CS."); | |
481 _next_in_special_set = r; | |
482 } | |
483 | |
484 // True iff it is or has been an allocation region in the current | |
485 // collection pause. | |
486 bool is_gc_alloc_region() const { | |
487 return _is_gc_alloc_region; | |
488 } | |
489 void set_is_gc_alloc_region(bool b) { | |
490 _is_gc_alloc_region = b; | |
491 } | |
492 HeapRegion* next_gc_alloc_region() { | |
493 assert(is_gc_alloc_region(), "should only invoke on member of CS."); | |
494 assert(_next_in_special_set == NULL || | |
495 _next_in_special_set->is_gc_alloc_region(), | |
496 "Malformed CS."); | |
497 return _next_in_special_set; | |
498 } | |
499 void set_next_gc_alloc_region(HeapRegion* r) { | |
500 assert(is_gc_alloc_region(), "should only invoke on member of CS."); | |
501 assert(r == NULL || r->is_gc_alloc_region(), "Malformed CS."); | |
502 _next_in_special_set = r; | |
503 } | |
504 | |
505 bool is_on_free_list() { | |
506 return _is_on_free_list; | |
507 } | |
508 | |
509 void set_on_free_list(bool b) { | |
510 _is_on_free_list = b; | |
511 } | |
512 | |
513 HeapRegion* next_from_free_list() { | |
514 assert(is_on_free_list(), | |
515 "Should only invoke on free space."); | |
516 assert(_next_in_special_set == NULL || | |
517 _next_in_special_set->is_on_free_list(), | |
518 "Malformed Free List."); | |
519 return _next_in_special_set; | |
520 } | |
521 | |
522 void set_next_on_free_list(HeapRegion* r) { | |
523 assert(r == NULL || r->is_on_free_list(), "Malformed free list."); | |
524 _next_in_special_set = r; | |
525 } | |
526 | |
527 bool is_on_unclean_list() { | |
528 return _is_on_unclean_list; | |
529 } | |
530 | |
531 void set_on_unclean_list(bool b); | |
532 | |
533 HeapRegion* next_from_unclean_list() { | |
534 assert(is_on_unclean_list(), | |
535 "Should only invoke on unclean space."); | |
536 assert(_next_in_special_set == NULL || | |
537 _next_in_special_set->is_on_unclean_list(), | |
538 "Malformed unclean List."); | |
539 return _next_in_special_set; | |
540 } | |
541 | |
542 void set_next_on_unclean_list(HeapRegion* r); | |
543 | |
544 HeapRegion* get_next_young_region() { return _next_young_region; } | |
545 void set_next_young_region(HeapRegion* hr) { | |
546 _next_young_region = hr; | |
547 } | |
548 | |
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549 HeapRegion* get_next_dirty_cards_region() const { return _next_dirty_cards_region; } |
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550 HeapRegion** next_dirty_cards_region_addr() { return &_next_dirty_cards_region; } |
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551 void set_next_dirty_cards_region(HeapRegion* hr) { _next_dirty_cards_region = hr; } |
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552 bool is_on_dirty_cards_region_list() const { return get_next_dirty_cards_region() != NULL; } |
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553 |
342 | 554 // Allows logical separation between objects allocated before and after. |
555 void save_marks(); | |
556 | |
557 // Reset HR stuff to default values. | |
558 void hr_clear(bool par, bool clear_space); | |
559 | |
356 | 560 void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
342 | 561 |
562 // Ensure that "this" is zero-filled. | |
563 void ensure_zero_filled(); | |
564 // This one requires that the calling thread holds ZF_mon. | |
565 void ensure_zero_filled_locked(); | |
566 | |
567 // Get the start of the unmarked area in this region. | |
568 HeapWord* prev_top_at_mark_start() const { return _prev_top_at_mark_start; } | |
569 HeapWord* next_top_at_mark_start() const { return _next_top_at_mark_start; } | |
570 | |
571 // Apply "cl->do_oop" to (the addresses of) all reference fields in objects | |
572 // allocated in the current region before the last call to "save_mark". | |
573 void oop_before_save_marks_iterate(OopClosure* cl); | |
574 | |
575 // This call determines the "filter kind" argument that will be used for | |
576 // the next call to "new_dcto_cl" on this region with the "traditional" | |
577 // signature (i.e., the call below.) The default, in the absence of a | |
578 // preceding call to this method, is "NoFilterKind", and a call to this | |
579 // method is necessary for each such call, or else it reverts to the | |
580 // default. | |
581 // (This is really ugly, but all other methods I could think of changed a | |
582 // lot of main-line code for G1.) | |
583 void set_next_filter_kind(HeapRegionDCTOC::FilterKind nfk) { | |
584 _next_fk = nfk; | |
585 } | |
586 | |
587 DirtyCardToOopClosure* | |
588 new_dcto_closure(OopClosure* cl, | |
589 CardTableModRefBS::PrecisionStyle precision, | |
590 HeapRegionDCTOC::FilterKind fk); | |
591 | |
592 #if WHASSUP | |
593 DirtyCardToOopClosure* | |
594 new_dcto_closure(OopClosure* cl, | |
595 CardTableModRefBS::PrecisionStyle precision, | |
596 HeapWord* boundary) { | |
597 assert(boundary == NULL, "This arg doesn't make sense here."); | |
598 DirtyCardToOopClosure* res = new_dcto_closure(cl, precision, _next_fk); | |
599 _next_fk = HeapRegionDCTOC::NoFilterKind; | |
600 return res; | |
601 } | |
602 #endif | |
603 | |
604 // | |
605 // Note the start or end of marking. This tells the heap region | |
606 // that the collector is about to start or has finished (concurrently) | |
607 // marking the heap. | |
608 // | |
609 | |
610 // Note the start of a marking phase. Record the | |
611 // start of the unmarked area of the region here. | |
612 void note_start_of_marking(bool during_initial_mark) { | |
613 init_top_at_conc_mark_count(); | |
614 _next_marked_bytes = 0; | |
615 if (during_initial_mark && is_young() && !is_survivor()) | |
616 _next_top_at_mark_start = bottom(); | |
617 else | |
618 _next_top_at_mark_start = top(); | |
619 } | |
620 | |
621 // Note the end of a marking phase. Install the start of | |
622 // the unmarked area that was captured at start of marking. | |
623 void note_end_of_marking() { | |
624 _prev_top_at_mark_start = _next_top_at_mark_start; | |
625 _prev_marked_bytes = _next_marked_bytes; | |
626 _next_marked_bytes = 0; | |
627 | |
628 guarantee(_prev_marked_bytes <= | |
629 (size_t) (prev_top_at_mark_start() - bottom()) * HeapWordSize, | |
630 "invariant"); | |
631 } | |
632 | |
633 // After an evacuation, we need to update _next_top_at_mark_start | |
634 // to be the current top. Note this is only valid if we have only | |
635 // ever evacuated into this region. If we evacuate, allocate, and | |
636 // then evacuate we are in deep doodoo. | |
637 void note_end_of_copying() { | |
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638 assert(top() >= _next_top_at_mark_start, "Increase only"); |
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639 _next_top_at_mark_start = top(); |
342 | 640 } |
641 | |
642 // Returns "false" iff no object in the region was allocated when the | |
643 // last mark phase ended. | |
644 bool is_marked() { return _prev_top_at_mark_start != bottom(); } | |
645 | |
646 // If "is_marked()" is true, then this is the index of the region in | |
647 // an array constructed at the end of marking of the regions in a | |
648 // "desirability" order. | |
649 int sort_index() { | |
650 return _sort_index; | |
651 } | |
652 void set_sort_index(int i) { | |
653 _sort_index = i; | |
654 } | |
655 | |
656 void init_top_at_conc_mark_count() { | |
657 _top_at_conc_mark_count = bottom(); | |
658 } | |
659 | |
660 void set_top_at_conc_mark_count(HeapWord *cur) { | |
661 assert(bottom() <= cur && cur <= end(), "Sanity."); | |
662 _top_at_conc_mark_count = cur; | |
663 } | |
664 | |
665 HeapWord* top_at_conc_mark_count() { | |
666 return _top_at_conc_mark_count; | |
667 } | |
668 | |
669 void reset_during_compaction() { | |
670 guarantee( isHumongous() && startsHumongous(), | |
671 "should only be called for humongous regions"); | |
672 | |
673 zero_marked_bytes(); | |
674 init_top_at_mark_start(); | |
675 } | |
676 | |
677 // <PREDICTION> | |
678 void calc_gc_efficiency(void); | |
679 double gc_efficiency() { return _gc_efficiency;} | |
680 // </PREDICTION> | |
681 | |
682 bool is_young() const { return _young_type != NotYoung; } | |
683 bool is_survivor() const { return _young_type == Survivor; } | |
684 | |
685 int young_index_in_cset() const { return _young_index_in_cset; } | |
686 void set_young_index_in_cset(int index) { | |
687 assert( (index == -1) || is_young(), "pre-condition" ); | |
688 _young_index_in_cset = index; | |
689 } | |
690 | |
691 int age_in_surv_rate_group() { | |
692 assert( _surv_rate_group != NULL, "pre-condition" ); | |
693 assert( _age_index > -1, "pre-condition" ); | |
694 return _surv_rate_group->age_in_group(_age_index); | |
695 } | |
696 | |
697 void record_surv_words_in_group(size_t words_survived) { | |
698 assert( _surv_rate_group != NULL, "pre-condition" ); | |
699 assert( _age_index > -1, "pre-condition" ); | |
700 int age_in_group = age_in_surv_rate_group(); | |
701 _surv_rate_group->record_surviving_words(age_in_group, words_survived); | |
702 } | |
703 | |
704 int age_in_surv_rate_group_cond() { | |
705 if (_surv_rate_group != NULL) | |
706 return age_in_surv_rate_group(); | |
707 else | |
708 return -1; | |
709 } | |
710 | |
711 SurvRateGroup* surv_rate_group() { | |
712 return _surv_rate_group; | |
713 } | |
714 | |
715 void install_surv_rate_group(SurvRateGroup* surv_rate_group) { | |
716 assert( surv_rate_group != NULL, "pre-condition" ); | |
717 assert( _surv_rate_group == NULL, "pre-condition" ); | |
718 assert( is_young(), "pre-condition" ); | |
719 | |
720 _surv_rate_group = surv_rate_group; | |
721 _age_index = surv_rate_group->next_age_index(); | |
722 } | |
723 | |
724 void uninstall_surv_rate_group() { | |
725 if (_surv_rate_group != NULL) { | |
726 assert( _age_index > -1, "pre-condition" ); | |
727 assert( is_young(), "pre-condition" ); | |
728 | |
729 _surv_rate_group = NULL; | |
730 _age_index = -1; | |
731 } else { | |
732 assert( _age_index == -1, "pre-condition" ); | |
733 } | |
734 } | |
735 | |
736 void set_young() { set_young_type(Young); } | |
737 | |
738 void set_survivor() { set_young_type(Survivor); } | |
739 | |
740 void set_not_young() { set_young_type(NotYoung); } | |
741 | |
742 // Determine if an object has been allocated since the last | |
743 // mark performed by the collector. This returns true iff the object | |
744 // is within the unmarked area of the region. | |
745 bool obj_allocated_since_prev_marking(oop obj) const { | |
746 return (HeapWord *) obj >= prev_top_at_mark_start(); | |
747 } | |
748 bool obj_allocated_since_next_marking(oop obj) const { | |
749 return (HeapWord *) obj >= next_top_at_mark_start(); | |
750 } | |
751 | |
752 // For parallel heapRegion traversal. | |
753 bool claimHeapRegion(int claimValue); | |
754 jint claim_value() { return _claimed; } | |
755 // Use this carefully: only when you're sure no one is claiming... | |
756 void set_claim_value(int claimValue) { _claimed = claimValue; } | |
757 | |
758 // Returns the "evacuation_failed" property of the region. | |
759 bool evacuation_failed() { return _evacuation_failed; } | |
760 | |
761 // Sets the "evacuation_failed" property of the region. | |
762 void set_evacuation_failed(bool b) { | |
763 _evacuation_failed = b; | |
764 | |
765 if (b) { | |
766 init_top_at_conc_mark_count(); | |
767 _next_marked_bytes = 0; | |
768 } | |
769 } | |
770 | |
771 // Requires that "mr" be entirely within the region. | |
772 // Apply "cl->do_object" to all objects that intersect with "mr". | |
773 // If the iteration encounters an unparseable portion of the region, | |
774 // or if "cl->abort()" is true after a closure application, | |
775 // terminate the iteration and return the address of the start of the | |
776 // subregion that isn't done. (The two can be distinguished by querying | |
777 // "cl->abort()".) Return of "NULL" indicates that the iteration | |
778 // completed. | |
779 HeapWord* | |
780 object_iterate_mem_careful(MemRegion mr, ObjectClosure* cl); | |
781 | |
1666
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782 // In this version - if filter_young is true and the region |
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783 // is a young region then we skip the iteration. |
342 | 784 HeapWord* |
785 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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786 FilterOutOfRegionClosure* cl, |
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787 bool filter_young); |
342 | 788 |
789 // A version of block start that is guaranteed to find *some* block | |
790 // boundary at or before "p", but does not object iteration, and may | |
791 // therefore be used safely when the heap is unparseable. | |
792 HeapWord* block_start_careful(const void* p) const { | |
793 return _offsets.block_start_careful(p); | |
794 } | |
795 | |
796 // Requires that "addr" is within the region. Returns the start of the | |
797 // first ("careful") block that starts at or after "addr", or else the | |
798 // "end" of the region if there is no such block. | |
799 HeapWord* next_block_start_careful(HeapWord* addr); | |
800 | |
801 // Returns the zero-fill-state of the current region. | |
802 ZeroFillState zero_fill_state() { return (ZeroFillState)_zfs; } | |
803 bool zero_fill_is_allocated() { return _zfs == Allocated; } | |
804 Thread* zero_filler() { return _zero_filler; } | |
805 | |
806 // Indicate that the contents of the region are unknown, and therefore | |
807 // might require zero-filling. | |
808 void set_zero_fill_needed() { | |
809 set_zero_fill_state_work(NotZeroFilled); | |
810 } | |
811 void set_zero_fill_in_progress(Thread* t) { | |
812 set_zero_fill_state_work(ZeroFilling); | |
813 _zero_filler = t; | |
814 } | |
815 void set_zero_fill_complete(); | |
816 void set_zero_fill_allocated() { | |
817 set_zero_fill_state_work(Allocated); | |
818 } | |
819 | |
820 void set_zero_fill_state_work(ZeroFillState zfs); | |
821 | |
822 // This is called when a full collection shrinks the heap. | |
823 // We want to set the heap region to a value which says | |
824 // it is no longer part of the heap. For now, we'll let "NotZF" fill | |
825 // that role. | |
826 void reset_zero_fill() { | |
827 set_zero_fill_state_work(NotZeroFilled); | |
828 _zero_filler = NULL; | |
829 } | |
830 | |
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831 size_t recorded_rs_length() const { return _recorded_rs_length; } |
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832 double predicted_elapsed_time_ms() const { return _predicted_elapsed_time_ms; } |
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833 size_t predicted_bytes_to_copy() const { return _predicted_bytes_to_copy; } |
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834 |
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835 void set_recorded_rs_length(size_t rs_length) { |
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836 _recorded_rs_length = rs_length; |
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837 } |
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838 |
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839 void set_predicted_elapsed_time_ms(double ms) { |
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840 _predicted_elapsed_time_ms = ms; |
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841 } |
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842 |
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843 void set_predicted_bytes_to_copy(size_t bytes) { |
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844 _predicted_bytes_to_copy = bytes; |
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845 } |
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846 |
342 | 847 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \ |
848 virtual void oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl); | |
849 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DECL) | |
850 | |
851 CompactibleSpace* next_compaction_space() const; | |
852 | |
853 virtual void reset_after_compaction(); | |
854 | |
855 void print() const; | |
856 void print_on(outputStream* st) const; | |
857 | |
811 | 858 // use_prev_marking == true -> use "prev" marking information, |
859 // use_prev_marking == false -> use "next" marking information | |
860 // NOTE: Only the "prev" marking information is guaranteed to be | |
861 // consistent most of the time, so most calls to this should use | |
862 // use_prev_marking == true. Currently, there is only one case where | |
863 // this is called with use_prev_marking == false, which is to verify | |
864 // the "next" marking information at the end of remark. | |
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865 void verify(bool allow_dirty, bool use_prev_marking, bool *failures) const; |
811 | 866 |
867 // Override; it uses the "prev" marking information | |
342 | 868 virtual void verify(bool allow_dirty) const; |
869 | |
870 #ifdef DEBUG | |
871 HeapWord* allocate(size_t size); | |
872 #endif | |
873 }; | |
874 | |
875 // HeapRegionClosure is used for iterating over regions. | |
876 // Terminates the iteration when the "doHeapRegion" method returns "true". | |
877 class HeapRegionClosure : public StackObj { | |
878 friend class HeapRegionSeq; | |
879 friend class G1CollectedHeap; | |
880 | |
881 bool _complete; | |
882 void incomplete() { _complete = false; } | |
883 | |
884 public: | |
885 HeapRegionClosure(): _complete(true) {} | |
886 | |
887 // Typically called on each region until it returns true. | |
888 virtual bool doHeapRegion(HeapRegion* r) = 0; | |
889 | |
890 // True after iteration if the closure was applied to all heap regions | |
891 // and returned "false" in all cases. | |
892 bool complete() { return _complete; } | |
893 }; | |
894 | |
895 // A linked lists of heap regions. It leaves the "next" field | |
896 // unspecified; that's up to subtypes. | |
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897 class RegionList VALUE_OBJ_CLASS_SPEC { |
342 | 898 protected: |
899 virtual HeapRegion* get_next(HeapRegion* chr) = 0; | |
900 virtual void set_next(HeapRegion* chr, | |
901 HeapRegion* new_next) = 0; | |
902 | |
903 HeapRegion* _hd; | |
904 HeapRegion* _tl; | |
905 size_t _sz; | |
906 | |
907 // Protected constructor because this type is only meaningful | |
908 // when the _get/_set next functions are defined. | |
909 RegionList() : _hd(NULL), _tl(NULL), _sz(0) {} | |
910 public: | |
911 void reset() { | |
912 _hd = NULL; | |
913 _tl = NULL; | |
914 _sz = 0; | |
915 } | |
916 HeapRegion* hd() { return _hd; } | |
917 HeapRegion* tl() { return _tl; } | |
918 size_t sz() { return _sz; } | |
919 size_t length(); | |
920 | |
921 bool well_formed() { | |
922 return | |
923 ((hd() == NULL && tl() == NULL && sz() == 0) | |
924 || (hd() != NULL && tl() != NULL && sz() > 0)) | |
925 && (sz() == length()); | |
926 } | |
927 virtual void insert_before_head(HeapRegion* r); | |
928 void prepend_list(RegionList* new_list); | |
929 virtual HeapRegion* pop(); | |
930 void dec_sz() { _sz--; } | |
931 // Requires that "r" is an element of the list, and is not the tail. | |
932 void delete_after(HeapRegion* r); | |
933 }; | |
934 | |
935 class EmptyNonHRegionList: public RegionList { | |
936 protected: | |
937 // Protected constructor because this type is only meaningful | |
938 // when the _get/_set next functions are defined. | |
939 EmptyNonHRegionList() : RegionList() {} | |
940 | |
941 public: | |
942 void insert_before_head(HeapRegion* r) { | |
943 // assert(r->is_empty(), "Better be empty"); | |
944 assert(!r->isHumongous(), "Better not be humongous."); | |
945 RegionList::insert_before_head(r); | |
946 } | |
947 void prepend_list(EmptyNonHRegionList* new_list) { | |
948 // assert(new_list->hd() == NULL || new_list->hd()->is_empty(), | |
949 // "Better be empty"); | |
950 assert(new_list->hd() == NULL || !new_list->hd()->isHumongous(), | |
951 "Better not be humongous."); | |
952 // assert(new_list->tl() == NULL || new_list->tl()->is_empty(), | |
953 // "Better be empty"); | |
954 assert(new_list->tl() == NULL || !new_list->tl()->isHumongous(), | |
955 "Better not be humongous."); | |
956 RegionList::prepend_list(new_list); | |
957 } | |
958 }; | |
959 | |
960 class UncleanRegionList: public EmptyNonHRegionList { | |
961 public: | |
962 HeapRegion* get_next(HeapRegion* hr) { | |
963 return hr->next_from_unclean_list(); | |
964 } | |
965 void set_next(HeapRegion* hr, HeapRegion* new_next) { | |
966 hr->set_next_on_unclean_list(new_next); | |
967 } | |
968 | |
969 UncleanRegionList() : EmptyNonHRegionList() {} | |
970 | |
971 void insert_before_head(HeapRegion* r) { | |
972 assert(!r->is_on_free_list(), | |
973 "Better not already be on free list"); | |
974 assert(!r->is_on_unclean_list(), | |
975 "Better not already be on unclean list"); | |
976 r->set_zero_fill_needed(); | |
977 r->set_on_unclean_list(true); | |
978 EmptyNonHRegionList::insert_before_head(r); | |
979 } | |
980 void prepend_list(UncleanRegionList* new_list) { | |
981 assert(new_list->tl() == NULL || !new_list->tl()->is_on_free_list(), | |
982 "Better not already be on free list"); | |
983 assert(new_list->tl() == NULL || new_list->tl()->is_on_unclean_list(), | |
984 "Better already be marked as on unclean list"); | |
985 assert(new_list->hd() == NULL || !new_list->hd()->is_on_free_list(), | |
986 "Better not already be on free list"); | |
987 assert(new_list->hd() == NULL || new_list->hd()->is_on_unclean_list(), | |
988 "Better already be marked as on unclean list"); | |
989 EmptyNonHRegionList::prepend_list(new_list); | |
990 } | |
991 HeapRegion* pop() { | |
992 HeapRegion* res = RegionList::pop(); | |
993 if (res != NULL) res->set_on_unclean_list(false); | |
994 return res; | |
995 } | |
996 }; | |
997 | |
998 // Local Variables: *** | |
999 // c-indentation-style: gnu *** | |
1000 // End: *** | |
1001 | |
1002 #endif // SERIALGC | |
1972 | 1003 |
1004 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP |