Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/heapRegion.hpp @ 751:20c6f43950b5
6490395: G1: Tidy up command line flags.
Summary: Change G1 flag names to be more consistent and disable some in 'product' mode.
Reviewed-by: tonyp, iveresov
author | johnc |
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date | Thu, 30 Apr 2009 15:07:53 -0700 |
parents | 96b229c54d1e |
children | 29e7d79232b9 |
rev | line source |
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342 | 1 /* |
579 | 2 * Copyright 2001-2009 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #ifndef SERIALGC | |
26 | |
27 // A HeapRegion is the smallest piece of a G1CollectedHeap that | |
28 // can be collected independently. | |
29 | |
30 // NOTE: Although a HeapRegion is a Space, its | |
31 // Space::initDirtyCardClosure method must not be called. | |
32 // The problem is that the existence of this method breaks | |
33 // the independence of barrier sets from remembered sets. | |
34 // The solution is to remove this method from the definition | |
35 // of a Space. | |
36 | |
37 class CompactibleSpace; | |
38 class ContiguousSpace; | |
39 class HeapRegionRemSet; | |
40 class HeapRegionRemSetIterator; | |
41 class HeapRegion; | |
42 | |
43 // A dirty card to oop closure for heap regions. It | |
44 // knows how to get the G1 heap and how to use the bitmap | |
45 // in the concurrent marker used by G1 to filter remembered | |
46 // sets. | |
47 | |
48 class HeapRegionDCTOC : public ContiguousSpaceDCTOC { | |
49 public: | |
50 // Specification of possible DirtyCardToOopClosure filtering. | |
51 enum FilterKind { | |
52 NoFilterKind, | |
53 IntoCSFilterKind, | |
54 OutOfRegionFilterKind | |
55 }; | |
56 | |
57 protected: | |
58 HeapRegion* _hr; | |
59 FilterKind _fk; | |
60 G1CollectedHeap* _g1; | |
61 | |
62 void walk_mem_region_with_cl(MemRegion mr, | |
63 HeapWord* bottom, HeapWord* top, | |
64 OopClosure* cl); | |
65 | |
66 // We don't specialize this for FilteringClosure; filtering is handled by | |
67 // the "FilterKind" mechanism. But we provide this to avoid a compiler | |
68 // warning. | |
69 void walk_mem_region_with_cl(MemRegion mr, | |
70 HeapWord* bottom, HeapWord* top, | |
71 FilteringClosure* cl) { | |
72 HeapRegionDCTOC::walk_mem_region_with_cl(mr, bottom, top, | |
73 (OopClosure*)cl); | |
74 } | |
75 | |
76 // Get the actual top of the area on which the closure will | |
77 // operate, given where the top is assumed to be (the end of the | |
78 // memory region passed to do_MemRegion) and where the object | |
79 // at the top is assumed to start. For example, an object may | |
80 // start at the top but actually extend past the assumed top, | |
81 // in which case the top becomes the end of the object. | |
82 HeapWord* get_actual_top(HeapWord* top, HeapWord* top_obj) { | |
83 return ContiguousSpaceDCTOC::get_actual_top(top, top_obj); | |
84 } | |
85 | |
86 // Walk the given memory region from bottom to (actual) top | |
87 // looking for objects and applying the oop closure (_cl) to | |
88 // them. The base implementation of this treats the area as | |
89 // blocks, where a block may or may not be an object. Sub- | |
90 // classes should override this to provide more accurate | |
91 // or possibly more efficient walking. | |
92 void walk_mem_region(MemRegion mr, HeapWord* bottom, HeapWord* top) { | |
93 Filtering_DCTOC::walk_mem_region(mr, bottom, top); | |
94 } | |
95 | |
96 public: | |
97 HeapRegionDCTOC(G1CollectedHeap* g1, | |
98 HeapRegion* hr, OopClosure* cl, | |
99 CardTableModRefBS::PrecisionStyle precision, | |
100 FilterKind fk); | |
101 }; | |
102 | |
103 | |
104 // The complicating factor is that BlockOffsetTable diverged | |
105 // significantly, and we need functionality that is only in the G1 version. | |
106 // So I copied that code, which led to an alternate G1 version of | |
107 // OffsetTableContigSpace. If the two versions of BlockOffsetTable could | |
108 // be reconciled, then G1OffsetTableContigSpace could go away. | |
109 | |
110 // The idea behind time stamps is the following. Doing a save_marks on | |
111 // all regions at every GC pause is time consuming (if I remember | |
112 // well, 10ms or so). So, we would like to do that only for regions | |
113 // that are GC alloc regions. To achieve this, we use time | |
114 // stamps. For every evacuation pause, G1CollectedHeap generates a | |
115 // unique time stamp (essentially a counter that gets | |
116 // incremented). Every time we want to call save_marks on a region, | |
117 // we set the saved_mark_word to top and also copy the current GC | |
118 // time stamp to the time stamp field of the space. Reading the | |
119 // saved_mark_word involves checking the time stamp of the | |
120 // region. If it is the same as the current GC time stamp, then we | |
121 // can safely read the saved_mark_word field, as it is valid. If the | |
122 // time stamp of the region is not the same as the current GC time | |
123 // stamp, then we instead read top, as the saved_mark_word field is | |
124 // invalid. Time stamps (on the regions and also on the | |
125 // G1CollectedHeap) are reset at every cleanup (we iterate over | |
126 // the regions anyway) and at the end of a Full GC. The current scheme | |
127 // that uses sequential unsigned ints will fail only if we have 4b | |
128 // evacuation pauses between two cleanups, which is _highly_ unlikely. | |
129 | |
130 class G1OffsetTableContigSpace: public ContiguousSpace { | |
131 friend class VMStructs; | |
132 protected: | |
133 G1BlockOffsetArrayContigSpace _offsets; | |
134 Mutex _par_alloc_lock; | |
135 volatile unsigned _gc_time_stamp; | |
136 | |
137 public: | |
138 // Constructor. If "is_zeroed" is true, the MemRegion "mr" may be | |
139 // assumed to contain zeros. | |
140 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
141 MemRegion mr, bool is_zeroed = false); | |
142 | |
143 void set_bottom(HeapWord* value); | |
144 void set_end(HeapWord* value); | |
145 | |
146 virtual HeapWord* saved_mark_word() const; | |
147 virtual void set_saved_mark(); | |
148 void reset_gc_time_stamp() { _gc_time_stamp = 0; } | |
149 | |
356 | 150 virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
151 virtual void clear(bool mangle_space); | |
342 | 152 |
153 HeapWord* block_start(const void* p); | |
154 HeapWord* block_start_const(const void* p) const; | |
155 | |
156 // Add offset table update. | |
157 virtual HeapWord* allocate(size_t word_size); | |
158 HeapWord* par_allocate(size_t word_size); | |
159 | |
160 // MarkSweep support phase3 | |
161 virtual HeapWord* initialize_threshold(); | |
162 virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* end); | |
163 | |
164 virtual void print() const; | |
165 }; | |
166 | |
167 class HeapRegion: public G1OffsetTableContigSpace { | |
168 friend class VMStructs; | |
169 private: | |
170 | |
355 | 171 enum HumongousType { |
172 NotHumongous = 0, | |
173 StartsHumongous, | |
174 ContinuesHumongous | |
175 }; | |
176 | |
342 | 177 // The next filter kind that should be used for a "new_dcto_cl" call with |
178 // the "traditional" signature. | |
179 HeapRegionDCTOC::FilterKind _next_fk; | |
180 | |
181 // Requires that the region "mr" be dense with objects, and begin and end | |
182 // with an object. | |
183 void oops_in_mr_iterate(MemRegion mr, OopClosure* cl); | |
184 | |
185 // The remembered set for this region. | |
186 // (Might want to make this "inline" later, to avoid some alloc failure | |
187 // issues.) | |
188 HeapRegionRemSet* _rem_set; | |
189 | |
190 G1BlockOffsetArrayContigSpace* offsets() { return &_offsets; } | |
191 | |
192 protected: | |
193 // If this region is a member of a HeapRegionSeq, the index in that | |
194 // sequence, otherwise -1. | |
195 int _hrs_index; | |
196 | |
355 | 197 HumongousType _humongous_type; |
342 | 198 // For a humongous region, region in which it starts. |
199 HeapRegion* _humongous_start_region; | |
200 // For the start region of a humongous sequence, it's original end(). | |
201 HeapWord* _orig_end; | |
202 | |
203 // True iff the region is in current collection_set. | |
204 bool _in_collection_set; | |
205 | |
206 // True iff the region is on the unclean list, waiting to be zero filled. | |
207 bool _is_on_unclean_list; | |
208 | |
209 // True iff the region is on the free list, ready for allocation. | |
210 bool _is_on_free_list; | |
211 | |
212 // Is this or has it been an allocation region in the current collection | |
213 // pause. | |
214 bool _is_gc_alloc_region; | |
215 | |
216 // True iff an attempt to evacuate an object in the region failed. | |
217 bool _evacuation_failed; | |
218 | |
219 // A heap region may be a member one of a number of special subsets, each | |
220 // represented as linked lists through the field below. Currently, these | |
221 // sets include: | |
222 // The collection set. | |
223 // The set of allocation regions used in a collection pause. | |
224 // Spaces that may contain gray objects. | |
225 HeapRegion* _next_in_special_set; | |
226 | |
227 // next region in the young "generation" region set | |
228 HeapRegion* _next_young_region; | |
229 | |
230 // For parallel heapRegion traversal. | |
231 jint _claimed; | |
232 | |
233 // We use concurrent marking to determine the amount of live data | |
234 // in each heap region. | |
235 size_t _prev_marked_bytes; // Bytes known to be live via last completed marking. | |
236 size_t _next_marked_bytes; // Bytes known to be live via in-progress marking. | |
237 | |
238 // See "sort_index" method. -1 means is not in the array. | |
239 int _sort_index; | |
240 | |
241 // <PREDICTION> | |
242 double _gc_efficiency; | |
243 // </PREDICTION> | |
244 | |
245 enum YoungType { | |
246 NotYoung, // a region is not young | |
247 ScanOnly, // a region is young and scan-only | |
248 Young, // a region is young | |
249 Survivor // a region is young and it contains | |
250 // survivor | |
251 }; | |
252 | |
253 YoungType _young_type; | |
254 int _young_index_in_cset; | |
255 SurvRateGroup* _surv_rate_group; | |
256 int _age_index; | |
257 | |
258 // The start of the unmarked area. The unmarked area extends from this | |
259 // word until the top and/or end of the region, and is the part | |
260 // of the region for which no marking was done, i.e. objects may | |
261 // have been allocated in this part since the last mark phase. | |
262 // "prev" is the top at the start of the last completed marking. | |
263 // "next" is the top at the start of the in-progress marking (if any.) | |
264 HeapWord* _prev_top_at_mark_start; | |
265 HeapWord* _next_top_at_mark_start; | |
266 // If a collection pause is in progress, this is the top at the start | |
267 // of that pause. | |
268 | |
269 // We've counted the marked bytes of objects below here. | |
270 HeapWord* _top_at_conc_mark_count; | |
271 | |
272 void init_top_at_mark_start() { | |
273 assert(_prev_marked_bytes == 0 && | |
274 _next_marked_bytes == 0, | |
275 "Must be called after zero_marked_bytes."); | |
276 HeapWord* bot = bottom(); | |
277 _prev_top_at_mark_start = bot; | |
278 _next_top_at_mark_start = bot; | |
279 _top_at_conc_mark_count = bot; | |
280 } | |
281 | |
282 jint _zfs; // A member of ZeroFillState. Protected by ZF_lock. | |
283 Thread* _zero_filler; // If _zfs is ZeroFilling, the thread that (last) | |
284 // made it so. | |
285 | |
286 void set_young_type(YoungType new_type) { | |
287 //assert(_young_type != new_type, "setting the same type" ); | |
288 // TODO: add more assertions here | |
289 _young_type = new_type; | |
290 } | |
291 | |
292 public: | |
293 // If "is_zeroed" is "true", the region "mr" can be assumed to contain zeros. | |
294 HeapRegion(G1BlockOffsetSharedArray* sharedOffsetArray, | |
295 MemRegion mr, bool is_zeroed); | |
296 | |
297 enum SomePublicConstants { | |
298 // HeapRegions are GrainBytes-aligned | |
299 // and have sizes that are multiples of GrainBytes. | |
300 LogOfHRGrainBytes = 20, | |
301 LogOfHRGrainWords = LogOfHRGrainBytes - LogHeapWordSize, | |
302 GrainBytes = 1 << LogOfHRGrainBytes, | |
303 GrainWords = 1 <<LogOfHRGrainWords, | |
304 MaxAge = 2, NoOfAges = MaxAge+1 | |
305 }; | |
306 | |
355 | 307 enum ClaimValues { |
308 InitialClaimValue = 0, | |
309 FinalCountClaimValue = 1, | |
310 NoteEndClaimValue = 2, | |
390 | 311 ScrubRemSetClaimValue = 3, |
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312 ParVerifyClaimValue = 4, |
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313 RebuildRSClaimValue = 5 |
355 | 314 }; |
315 | |
342 | 316 // Concurrent refinement requires contiguous heap regions (in which TLABs |
317 // might be allocated) to be zero-filled. Each region therefore has a | |
318 // zero-fill-state. | |
319 enum ZeroFillState { | |
320 NotZeroFilled, | |
321 ZeroFilling, | |
322 ZeroFilled, | |
323 Allocated | |
324 }; | |
325 | |
326 // If this region is a member of a HeapRegionSeq, the index in that | |
327 // sequence, otherwise -1. | |
328 int hrs_index() const { return _hrs_index; } | |
329 void set_hrs_index(int index) { _hrs_index = index; } | |
330 | |
331 // The number of bytes marked live in the region in the last marking phase. | |
332 size_t marked_bytes() { return _prev_marked_bytes; } | |
333 // The number of bytes counted in the next marking. | |
334 size_t next_marked_bytes() { return _next_marked_bytes; } | |
335 // The number of bytes live wrt the next marking. | |
336 size_t next_live_bytes() { | |
337 return (top() - next_top_at_mark_start()) | |
338 * HeapWordSize | |
339 + next_marked_bytes(); | |
340 } | |
341 | |
342 // A lower bound on the amount of garbage bytes in the region. | |
343 size_t garbage_bytes() { | |
344 size_t used_at_mark_start_bytes = | |
345 (prev_top_at_mark_start() - bottom()) * HeapWordSize; | |
346 assert(used_at_mark_start_bytes >= marked_bytes(), | |
347 "Can't mark more than we have."); | |
348 return used_at_mark_start_bytes - marked_bytes(); | |
349 } | |
350 | |
351 // An upper bound on the number of live bytes in the region. | |
352 size_t max_live_bytes() { return used() - garbage_bytes(); } | |
353 | |
354 void add_to_marked_bytes(size_t incr_bytes) { | |
355 _next_marked_bytes = _next_marked_bytes + incr_bytes; | |
356 guarantee( _next_marked_bytes <= used(), "invariant" ); | |
357 } | |
358 | |
359 void zero_marked_bytes() { | |
360 _prev_marked_bytes = _next_marked_bytes = 0; | |
361 } | |
362 | |
355 | 363 bool isHumongous() const { return _humongous_type != NotHumongous; } |
364 bool startsHumongous() const { return _humongous_type == StartsHumongous; } | |
365 bool continuesHumongous() const { return _humongous_type == ContinuesHumongous; } | |
342 | 366 // For a humongous region, region in which it starts. |
367 HeapRegion* humongous_start_region() const { | |
368 return _humongous_start_region; | |
369 } | |
370 | |
371 // Causes the current region to represent a humongous object spanning "n" | |
372 // regions. | |
373 virtual void set_startsHumongous(); | |
374 | |
375 // The regions that continue a humongous sequence should be added using | |
376 // this method, in increasing address order. | |
377 void set_continuesHumongous(HeapRegion* start); | |
378 | |
379 void add_continuingHumongousRegion(HeapRegion* cont); | |
380 | |
381 // If the region has a remembered set, return a pointer to it. | |
382 HeapRegionRemSet* rem_set() const { | |
383 return _rem_set; | |
384 } | |
385 | |
386 // True iff the region is in current collection_set. | |
387 bool in_collection_set() const { | |
388 return _in_collection_set; | |
389 } | |
390 void set_in_collection_set(bool b) { | |
391 _in_collection_set = b; | |
392 } | |
393 HeapRegion* next_in_collection_set() { | |
394 assert(in_collection_set(), "should only invoke on member of CS."); | |
395 assert(_next_in_special_set == NULL || | |
396 _next_in_special_set->in_collection_set(), | |
397 "Malformed CS."); | |
398 return _next_in_special_set; | |
399 } | |
400 void set_next_in_collection_set(HeapRegion* r) { | |
401 assert(in_collection_set(), "should only invoke on member of CS."); | |
402 assert(r == NULL || r->in_collection_set(), "Malformed CS."); | |
403 _next_in_special_set = r; | |
404 } | |
405 | |
406 // True iff it is or has been an allocation region in the current | |
407 // collection pause. | |
408 bool is_gc_alloc_region() const { | |
409 return _is_gc_alloc_region; | |
410 } | |
411 void set_is_gc_alloc_region(bool b) { | |
412 _is_gc_alloc_region = b; | |
413 } | |
414 HeapRegion* next_gc_alloc_region() { | |
415 assert(is_gc_alloc_region(), "should only invoke on member of CS."); | |
416 assert(_next_in_special_set == NULL || | |
417 _next_in_special_set->is_gc_alloc_region(), | |
418 "Malformed CS."); | |
419 return _next_in_special_set; | |
420 } | |
421 void set_next_gc_alloc_region(HeapRegion* r) { | |
422 assert(is_gc_alloc_region(), "should only invoke on member of CS."); | |
423 assert(r == NULL || r->is_gc_alloc_region(), "Malformed CS."); | |
424 _next_in_special_set = r; | |
425 } | |
426 | |
427 bool is_on_free_list() { | |
428 return _is_on_free_list; | |
429 } | |
430 | |
431 void set_on_free_list(bool b) { | |
432 _is_on_free_list = b; | |
433 } | |
434 | |
435 HeapRegion* next_from_free_list() { | |
436 assert(is_on_free_list(), | |
437 "Should only invoke on free space."); | |
438 assert(_next_in_special_set == NULL || | |
439 _next_in_special_set->is_on_free_list(), | |
440 "Malformed Free List."); | |
441 return _next_in_special_set; | |
442 } | |
443 | |
444 void set_next_on_free_list(HeapRegion* r) { | |
445 assert(r == NULL || r->is_on_free_list(), "Malformed free list."); | |
446 _next_in_special_set = r; | |
447 } | |
448 | |
449 bool is_on_unclean_list() { | |
450 return _is_on_unclean_list; | |
451 } | |
452 | |
453 void set_on_unclean_list(bool b); | |
454 | |
455 HeapRegion* next_from_unclean_list() { | |
456 assert(is_on_unclean_list(), | |
457 "Should only invoke on unclean space."); | |
458 assert(_next_in_special_set == NULL || | |
459 _next_in_special_set->is_on_unclean_list(), | |
460 "Malformed unclean List."); | |
461 return _next_in_special_set; | |
462 } | |
463 | |
464 void set_next_on_unclean_list(HeapRegion* r); | |
465 | |
466 HeapRegion* get_next_young_region() { return _next_young_region; } | |
467 void set_next_young_region(HeapRegion* hr) { | |
468 _next_young_region = hr; | |
469 } | |
470 | |
471 // Allows logical separation between objects allocated before and after. | |
472 void save_marks(); | |
473 | |
474 // Reset HR stuff to default values. | |
475 void hr_clear(bool par, bool clear_space); | |
476 | |
356 | 477 void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
342 | 478 |
479 // Ensure that "this" is zero-filled. | |
480 void ensure_zero_filled(); | |
481 // This one requires that the calling thread holds ZF_mon. | |
482 void ensure_zero_filled_locked(); | |
483 | |
484 // Get the start of the unmarked area in this region. | |
485 HeapWord* prev_top_at_mark_start() const { return _prev_top_at_mark_start; } | |
486 HeapWord* next_top_at_mark_start() const { return _next_top_at_mark_start; } | |
487 | |
488 // Apply "cl->do_oop" to (the addresses of) all reference fields in objects | |
489 // allocated in the current region before the last call to "save_mark". | |
490 void oop_before_save_marks_iterate(OopClosure* cl); | |
491 | |
492 // This call determines the "filter kind" argument that will be used for | |
493 // the next call to "new_dcto_cl" on this region with the "traditional" | |
494 // signature (i.e., the call below.) The default, in the absence of a | |
495 // preceding call to this method, is "NoFilterKind", and a call to this | |
496 // method is necessary for each such call, or else it reverts to the | |
497 // default. | |
498 // (This is really ugly, but all other methods I could think of changed a | |
499 // lot of main-line code for G1.) | |
500 void set_next_filter_kind(HeapRegionDCTOC::FilterKind nfk) { | |
501 _next_fk = nfk; | |
502 } | |
503 | |
504 DirtyCardToOopClosure* | |
505 new_dcto_closure(OopClosure* cl, | |
506 CardTableModRefBS::PrecisionStyle precision, | |
507 HeapRegionDCTOC::FilterKind fk); | |
508 | |
509 #if WHASSUP | |
510 DirtyCardToOopClosure* | |
511 new_dcto_closure(OopClosure* cl, | |
512 CardTableModRefBS::PrecisionStyle precision, | |
513 HeapWord* boundary) { | |
514 assert(boundary == NULL, "This arg doesn't make sense here."); | |
515 DirtyCardToOopClosure* res = new_dcto_closure(cl, precision, _next_fk); | |
516 _next_fk = HeapRegionDCTOC::NoFilterKind; | |
517 return res; | |
518 } | |
519 #endif | |
520 | |
521 // | |
522 // Note the start or end of marking. This tells the heap region | |
523 // that the collector is about to start or has finished (concurrently) | |
524 // marking the heap. | |
525 // | |
526 | |
527 // Note the start of a marking phase. Record the | |
528 // start of the unmarked area of the region here. | |
529 void note_start_of_marking(bool during_initial_mark) { | |
530 init_top_at_conc_mark_count(); | |
531 _next_marked_bytes = 0; | |
532 if (during_initial_mark && is_young() && !is_survivor()) | |
533 _next_top_at_mark_start = bottom(); | |
534 else | |
535 _next_top_at_mark_start = top(); | |
536 } | |
537 | |
538 // Note the end of a marking phase. Install the start of | |
539 // the unmarked area that was captured at start of marking. | |
540 void note_end_of_marking() { | |
541 _prev_top_at_mark_start = _next_top_at_mark_start; | |
542 _prev_marked_bytes = _next_marked_bytes; | |
543 _next_marked_bytes = 0; | |
544 | |
545 guarantee(_prev_marked_bytes <= | |
546 (size_t) (prev_top_at_mark_start() - bottom()) * HeapWordSize, | |
547 "invariant"); | |
548 } | |
549 | |
550 // After an evacuation, we need to update _next_top_at_mark_start | |
551 // to be the current top. Note this is only valid if we have only | |
552 // ever evacuated into this region. If we evacuate, allocate, and | |
553 // then evacuate we are in deep doodoo. | |
554 void note_end_of_copying() { | |
555 assert(top() >= _next_top_at_mark_start, | |
556 "Increase only"); | |
545 | 557 // Survivor regions will be scanned on the start of concurrent |
558 // marking. | |
559 if (!is_survivor()) { | |
560 _next_top_at_mark_start = top(); | |
561 } | |
342 | 562 } |
563 | |
564 // Returns "false" iff no object in the region was allocated when the | |
565 // last mark phase ended. | |
566 bool is_marked() { return _prev_top_at_mark_start != bottom(); } | |
567 | |
568 // If "is_marked()" is true, then this is the index of the region in | |
569 // an array constructed at the end of marking of the regions in a | |
570 // "desirability" order. | |
571 int sort_index() { | |
572 return _sort_index; | |
573 } | |
574 void set_sort_index(int i) { | |
575 _sort_index = i; | |
576 } | |
577 | |
578 void init_top_at_conc_mark_count() { | |
579 _top_at_conc_mark_count = bottom(); | |
580 } | |
581 | |
582 void set_top_at_conc_mark_count(HeapWord *cur) { | |
583 assert(bottom() <= cur && cur <= end(), "Sanity."); | |
584 _top_at_conc_mark_count = cur; | |
585 } | |
586 | |
587 HeapWord* top_at_conc_mark_count() { | |
588 return _top_at_conc_mark_count; | |
589 } | |
590 | |
591 void reset_during_compaction() { | |
592 guarantee( isHumongous() && startsHumongous(), | |
593 "should only be called for humongous regions"); | |
594 | |
595 zero_marked_bytes(); | |
596 init_top_at_mark_start(); | |
597 } | |
598 | |
599 // <PREDICTION> | |
600 void calc_gc_efficiency(void); | |
601 double gc_efficiency() { return _gc_efficiency;} | |
602 // </PREDICTION> | |
603 | |
604 bool is_young() const { return _young_type != NotYoung; } | |
605 bool is_scan_only() const { return _young_type == ScanOnly; } | |
606 bool is_survivor() const { return _young_type == Survivor; } | |
607 | |
608 int young_index_in_cset() const { return _young_index_in_cset; } | |
609 void set_young_index_in_cset(int index) { | |
610 assert( (index == -1) || is_young(), "pre-condition" ); | |
611 _young_index_in_cset = index; | |
612 } | |
613 | |
614 int age_in_surv_rate_group() { | |
615 assert( _surv_rate_group != NULL, "pre-condition" ); | |
616 assert( _age_index > -1, "pre-condition" ); | |
617 return _surv_rate_group->age_in_group(_age_index); | |
618 } | |
619 | |
620 void recalculate_age_in_surv_rate_group() { | |
621 assert( _surv_rate_group != NULL, "pre-condition" ); | |
622 assert( _age_index > -1, "pre-condition" ); | |
623 _age_index = _surv_rate_group->recalculate_age_index(_age_index); | |
624 } | |
625 | |
626 void record_surv_words_in_group(size_t words_survived) { | |
627 assert( _surv_rate_group != NULL, "pre-condition" ); | |
628 assert( _age_index > -1, "pre-condition" ); | |
629 int age_in_group = age_in_surv_rate_group(); | |
630 _surv_rate_group->record_surviving_words(age_in_group, words_survived); | |
631 } | |
632 | |
633 int age_in_surv_rate_group_cond() { | |
634 if (_surv_rate_group != NULL) | |
635 return age_in_surv_rate_group(); | |
636 else | |
637 return -1; | |
638 } | |
639 | |
640 SurvRateGroup* surv_rate_group() { | |
641 return _surv_rate_group; | |
642 } | |
643 | |
644 void install_surv_rate_group(SurvRateGroup* surv_rate_group) { | |
645 assert( surv_rate_group != NULL, "pre-condition" ); | |
646 assert( _surv_rate_group == NULL, "pre-condition" ); | |
647 assert( is_young(), "pre-condition" ); | |
648 | |
649 _surv_rate_group = surv_rate_group; | |
650 _age_index = surv_rate_group->next_age_index(); | |
651 } | |
652 | |
653 void uninstall_surv_rate_group() { | |
654 if (_surv_rate_group != NULL) { | |
655 assert( _age_index > -1, "pre-condition" ); | |
656 assert( is_young(), "pre-condition" ); | |
657 | |
658 _surv_rate_group = NULL; | |
659 _age_index = -1; | |
660 } else { | |
661 assert( _age_index == -1, "pre-condition" ); | |
662 } | |
663 } | |
664 | |
665 void set_young() { set_young_type(Young); } | |
666 | |
667 void set_scan_only() { set_young_type(ScanOnly); } | |
668 | |
669 void set_survivor() { set_young_type(Survivor); } | |
670 | |
671 void set_not_young() { set_young_type(NotYoung); } | |
672 | |
673 // Determine if an object has been allocated since the last | |
674 // mark performed by the collector. This returns true iff the object | |
675 // is within the unmarked area of the region. | |
676 bool obj_allocated_since_prev_marking(oop obj) const { | |
677 return (HeapWord *) obj >= prev_top_at_mark_start(); | |
678 } | |
679 bool obj_allocated_since_next_marking(oop obj) const { | |
680 return (HeapWord *) obj >= next_top_at_mark_start(); | |
681 } | |
682 | |
683 // For parallel heapRegion traversal. | |
684 bool claimHeapRegion(int claimValue); | |
685 jint claim_value() { return _claimed; } | |
686 // Use this carefully: only when you're sure no one is claiming... | |
687 void set_claim_value(int claimValue) { _claimed = claimValue; } | |
688 | |
689 // Returns the "evacuation_failed" property of the region. | |
690 bool evacuation_failed() { return _evacuation_failed; } | |
691 | |
692 // Sets the "evacuation_failed" property of the region. | |
693 void set_evacuation_failed(bool b) { | |
694 _evacuation_failed = b; | |
695 | |
696 if (b) { | |
697 init_top_at_conc_mark_count(); | |
698 _next_marked_bytes = 0; | |
699 } | |
700 } | |
701 | |
702 // Requires that "mr" be entirely within the region. | |
703 // Apply "cl->do_object" to all objects that intersect with "mr". | |
704 // If the iteration encounters an unparseable portion of the region, | |
705 // or if "cl->abort()" is true after a closure application, | |
706 // terminate the iteration and return the address of the start of the | |
707 // subregion that isn't done. (The two can be distinguished by querying | |
708 // "cl->abort()".) Return of "NULL" indicates that the iteration | |
709 // completed. | |
710 HeapWord* | |
711 object_iterate_mem_careful(MemRegion mr, ObjectClosure* cl); | |
712 | |
713 HeapWord* | |
714 oops_on_card_seq_iterate_careful(MemRegion mr, | |
715 FilterOutOfRegionClosure* cl); | |
716 | |
717 // The region "mr" is entirely in "this", and starts and ends at block | |
718 // boundaries. The caller declares that all the contained blocks are | |
719 // coalesced into one. | |
720 void declare_filled_region_to_BOT(MemRegion mr) { | |
721 _offsets.single_block(mr.start(), mr.end()); | |
722 } | |
723 | |
724 // A version of block start that is guaranteed to find *some* block | |
725 // boundary at or before "p", but does not object iteration, and may | |
726 // therefore be used safely when the heap is unparseable. | |
727 HeapWord* block_start_careful(const void* p) const { | |
728 return _offsets.block_start_careful(p); | |
729 } | |
730 | |
731 // Requires that "addr" is within the region. Returns the start of the | |
732 // first ("careful") block that starts at or after "addr", or else the | |
733 // "end" of the region if there is no such block. | |
734 HeapWord* next_block_start_careful(HeapWord* addr); | |
735 | |
736 // Returns the zero-fill-state of the current region. | |
737 ZeroFillState zero_fill_state() { return (ZeroFillState)_zfs; } | |
738 bool zero_fill_is_allocated() { return _zfs == Allocated; } | |
739 Thread* zero_filler() { return _zero_filler; } | |
740 | |
741 // Indicate that the contents of the region are unknown, and therefore | |
742 // might require zero-filling. | |
743 void set_zero_fill_needed() { | |
744 set_zero_fill_state_work(NotZeroFilled); | |
745 } | |
746 void set_zero_fill_in_progress(Thread* t) { | |
747 set_zero_fill_state_work(ZeroFilling); | |
748 _zero_filler = t; | |
749 } | |
750 void set_zero_fill_complete(); | |
751 void set_zero_fill_allocated() { | |
752 set_zero_fill_state_work(Allocated); | |
753 } | |
754 | |
755 void set_zero_fill_state_work(ZeroFillState zfs); | |
756 | |
757 // This is called when a full collection shrinks the heap. | |
758 // We want to set the heap region to a value which says | |
759 // it is no longer part of the heap. For now, we'll let "NotZF" fill | |
760 // that role. | |
761 void reset_zero_fill() { | |
762 set_zero_fill_state_work(NotZeroFilled); | |
763 _zero_filler = NULL; | |
764 } | |
765 | |
766 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \ | |
767 virtual void oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl); | |
768 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DECL) | |
769 | |
770 CompactibleSpace* next_compaction_space() const; | |
771 | |
772 virtual void reset_after_compaction(); | |
773 | |
774 void print() const; | |
775 void print_on(outputStream* st) const; | |
776 | |
777 // Override | |
778 virtual void verify(bool allow_dirty) const; | |
779 | |
780 #ifdef DEBUG | |
781 HeapWord* allocate(size_t size); | |
782 #endif | |
783 }; | |
784 | |
785 // HeapRegionClosure is used for iterating over regions. | |
786 // Terminates the iteration when the "doHeapRegion" method returns "true". | |
787 class HeapRegionClosure : public StackObj { | |
788 friend class HeapRegionSeq; | |
789 friend class G1CollectedHeap; | |
790 | |
791 bool _complete; | |
792 void incomplete() { _complete = false; } | |
793 | |
794 public: | |
795 HeapRegionClosure(): _complete(true) {} | |
796 | |
797 // Typically called on each region until it returns true. | |
798 virtual bool doHeapRegion(HeapRegion* r) = 0; | |
799 | |
800 // True after iteration if the closure was applied to all heap regions | |
801 // and returned "false" in all cases. | |
802 bool complete() { return _complete; } | |
803 }; | |
804 | |
805 // A linked lists of heap regions. It leaves the "next" field | |
806 // unspecified; that's up to subtypes. | |
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807 class RegionList VALUE_OBJ_CLASS_SPEC { |
342 | 808 protected: |
809 virtual HeapRegion* get_next(HeapRegion* chr) = 0; | |
810 virtual void set_next(HeapRegion* chr, | |
811 HeapRegion* new_next) = 0; | |
812 | |
813 HeapRegion* _hd; | |
814 HeapRegion* _tl; | |
815 size_t _sz; | |
816 | |
817 // Protected constructor because this type is only meaningful | |
818 // when the _get/_set next functions are defined. | |
819 RegionList() : _hd(NULL), _tl(NULL), _sz(0) {} | |
820 public: | |
821 void reset() { | |
822 _hd = NULL; | |
823 _tl = NULL; | |
824 _sz = 0; | |
825 } | |
826 HeapRegion* hd() { return _hd; } | |
827 HeapRegion* tl() { return _tl; } | |
828 size_t sz() { return _sz; } | |
829 size_t length(); | |
830 | |
831 bool well_formed() { | |
832 return | |
833 ((hd() == NULL && tl() == NULL && sz() == 0) | |
834 || (hd() != NULL && tl() != NULL && sz() > 0)) | |
835 && (sz() == length()); | |
836 } | |
837 virtual void insert_before_head(HeapRegion* r); | |
838 void prepend_list(RegionList* new_list); | |
839 virtual HeapRegion* pop(); | |
840 void dec_sz() { _sz--; } | |
841 // Requires that "r" is an element of the list, and is not the tail. | |
842 void delete_after(HeapRegion* r); | |
843 }; | |
844 | |
845 class EmptyNonHRegionList: public RegionList { | |
846 protected: | |
847 // Protected constructor because this type is only meaningful | |
848 // when the _get/_set next functions are defined. | |
849 EmptyNonHRegionList() : RegionList() {} | |
850 | |
851 public: | |
852 void insert_before_head(HeapRegion* r) { | |
853 // assert(r->is_empty(), "Better be empty"); | |
854 assert(!r->isHumongous(), "Better not be humongous."); | |
855 RegionList::insert_before_head(r); | |
856 } | |
857 void prepend_list(EmptyNonHRegionList* new_list) { | |
858 // assert(new_list->hd() == NULL || new_list->hd()->is_empty(), | |
859 // "Better be empty"); | |
860 assert(new_list->hd() == NULL || !new_list->hd()->isHumongous(), | |
861 "Better not be humongous."); | |
862 // assert(new_list->tl() == NULL || new_list->tl()->is_empty(), | |
863 // "Better be empty"); | |
864 assert(new_list->tl() == NULL || !new_list->tl()->isHumongous(), | |
865 "Better not be humongous."); | |
866 RegionList::prepend_list(new_list); | |
867 } | |
868 }; | |
869 | |
870 class UncleanRegionList: public EmptyNonHRegionList { | |
871 public: | |
872 HeapRegion* get_next(HeapRegion* hr) { | |
873 return hr->next_from_unclean_list(); | |
874 } | |
875 void set_next(HeapRegion* hr, HeapRegion* new_next) { | |
876 hr->set_next_on_unclean_list(new_next); | |
877 } | |
878 | |
879 UncleanRegionList() : EmptyNonHRegionList() {} | |
880 | |
881 void insert_before_head(HeapRegion* r) { | |
882 assert(!r->is_on_free_list(), | |
883 "Better not already be on free list"); | |
884 assert(!r->is_on_unclean_list(), | |
885 "Better not already be on unclean list"); | |
886 r->set_zero_fill_needed(); | |
887 r->set_on_unclean_list(true); | |
888 EmptyNonHRegionList::insert_before_head(r); | |
889 } | |
890 void prepend_list(UncleanRegionList* new_list) { | |
891 assert(new_list->tl() == NULL || !new_list->tl()->is_on_free_list(), | |
892 "Better not already be on free list"); | |
893 assert(new_list->tl() == NULL || new_list->tl()->is_on_unclean_list(), | |
894 "Better already be marked as on unclean list"); | |
895 assert(new_list->hd() == NULL || !new_list->hd()->is_on_free_list(), | |
896 "Better not already be on free list"); | |
897 assert(new_list->hd() == NULL || new_list->hd()->is_on_unclean_list(), | |
898 "Better already be marked as on unclean list"); | |
899 EmptyNonHRegionList::prepend_list(new_list); | |
900 } | |
901 HeapRegion* pop() { | |
902 HeapRegion* res = RegionList::pop(); | |
903 if (res != NULL) res->set_on_unclean_list(false); | |
904 return res; | |
905 } | |
906 }; | |
907 | |
908 // Local Variables: *** | |
909 // c-indentation-style: gnu *** | |
910 // End: *** | |
911 | |
912 #endif // SERIALGC |