Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp @ 595:3698e8f47799
6804746: G1: guarantee(variance() > -1.0,"variance should be >= 0") (due to evacuation failure)
Summary: Under certain circumstances (evacuation failure) the pause time is not communicated to the policy and, as a result, the pause time field is not initialized properly.
Reviewed-by: jmasa
author | tonyp |
---|---|
date | Tue, 24 Feb 2009 15:50:23 -0500 |
parents | 58054a18d735 |
children | 0fbdb4381b99 c3a720eefe82 |
rev | line source |
---|---|
342 | 1 /* |
2 * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved. | |
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 #include "incls/_precompiled.incl" | |
26 #include "incls/_heapRegionRemSet.cpp.incl" | |
27 | |
28 #define HRRS_VERBOSE 0 | |
29 | |
30 #define PRT_COUNT_OCCUPIED 1 | |
31 | |
32 // OtherRegionsTable | |
33 | |
34 class PerRegionTable: public CHeapObj { | |
35 friend class OtherRegionsTable; | |
36 friend class HeapRegionRemSetIterator; | |
37 | |
38 HeapRegion* _hr; | |
39 BitMap _bm; | |
40 #if PRT_COUNT_OCCUPIED | |
41 jint _occupied; | |
42 #endif | |
43 PerRegionTable* _next_free; | |
44 | |
45 PerRegionTable* next_free() { return _next_free; } | |
46 void set_next_free(PerRegionTable* prt) { _next_free = prt; } | |
47 | |
48 | |
49 static PerRegionTable* _free_list; | |
50 | |
51 #ifdef _MSC_VER | |
52 // For some reason even though the classes are marked as friend they are unable | |
53 // to access CardsPerRegion when private/protected. Only the windows c++ compiler | |
54 // says this Sun CC and linux gcc don't have a problem with access when private | |
55 | |
56 public: | |
57 | |
58 #endif // _MSC_VER | |
59 | |
60 enum SomePrivateConstants { | |
61 CardsPerRegion = HeapRegion::GrainBytes >> CardTableModRefBS::card_shift | |
62 }; | |
63 | |
64 protected: | |
65 // We need access in order to union things into the base table. | |
66 BitMap* bm() { return &_bm; } | |
67 | |
545 | 68 #if PRT_COUNT_OCCUPIED |
342 | 69 void recount_occupied() { |
70 _occupied = (jint) bm()->count_one_bits(); | |
71 } | |
545 | 72 #endif |
342 | 73 |
74 PerRegionTable(HeapRegion* hr) : | |
75 _hr(hr), | |
76 #if PRT_COUNT_OCCUPIED | |
77 _occupied(0), | |
78 #endif | |
79 _bm(CardsPerRegion, false /* in-resource-area */) | |
80 {} | |
81 | |
82 static void free(PerRegionTable* prt) { | |
83 while (true) { | |
84 PerRegionTable* fl = _free_list; | |
85 prt->set_next_free(fl); | |
86 PerRegionTable* res = | |
87 (PerRegionTable*) | |
88 Atomic::cmpxchg_ptr(prt, &_free_list, fl); | |
89 if (res == fl) return; | |
90 } | |
91 ShouldNotReachHere(); | |
92 } | |
93 | |
94 static PerRegionTable* alloc(HeapRegion* hr) { | |
95 PerRegionTable* fl = _free_list; | |
96 while (fl != NULL) { | |
97 PerRegionTable* nxt = fl->next_free(); | |
98 PerRegionTable* res = | |
99 (PerRegionTable*) | |
100 Atomic::cmpxchg_ptr(nxt, &_free_list, fl); | |
101 if (res == fl) { | |
102 fl->init(hr); | |
103 return fl; | |
104 } else { | |
105 fl = _free_list; | |
106 } | |
107 } | |
108 assert(fl == NULL, "Loop condition."); | |
109 return new PerRegionTable(hr); | |
110 } | |
111 | |
112 void add_card_work(short from_card, bool par) { | |
113 if (!_bm.at(from_card)) { | |
114 if (par) { | |
115 if (_bm.par_at_put(from_card, 1)) { | |
116 #if PRT_COUNT_OCCUPIED | |
117 Atomic::inc(&_occupied); | |
118 #endif | |
119 } | |
120 } else { | |
121 _bm.at_put(from_card, 1); | |
122 #if PRT_COUNT_OCCUPIED | |
123 _occupied++; | |
124 #endif | |
125 } | |
126 } | |
127 } | |
128 | |
129 void add_reference_work(oop* from, bool par) { | |
130 // Must make this robust in case "from" is not in "_hr", because of | |
131 // concurrency. | |
132 | |
133 #if HRRS_VERBOSE | |
134 gclog_or_tty->print_cr(" PRT::Add_reference_work(" PTR_FORMAT "->" PTR_FORMAT").", | |
135 from, *from); | |
136 #endif | |
137 | |
138 HeapRegion* loc_hr = hr(); | |
139 // If the test below fails, then this table was reused concurrently | |
140 // with this operation. This is OK, since the old table was coarsened, | |
141 // and adding a bit to the new table is never incorrect. | |
142 if (loc_hr->is_in_reserved(from)) { | |
143 size_t hw_offset = pointer_delta((HeapWord*)from, loc_hr->bottom()); | |
144 size_t from_card = | |
145 hw_offset >> | |
146 (CardTableModRefBS::card_shift - LogHeapWordSize); | |
147 | |
148 add_card_work((short) from_card, par); | |
149 } | |
150 } | |
151 | |
152 public: | |
153 | |
154 HeapRegion* hr() const { return _hr; } | |
155 | |
156 #if PRT_COUNT_OCCUPIED | |
157 jint occupied() const { | |
158 // Overkill, but if we ever need it... | |
159 // guarantee(_occupied == _bm.count_one_bits(), "Check"); | |
160 return _occupied; | |
161 } | |
162 #else | |
163 jint occupied() const { | |
164 return _bm.count_one_bits(); | |
165 } | |
166 #endif | |
167 | |
168 void init(HeapRegion* hr) { | |
169 _hr = hr; | |
170 #if PRT_COUNT_OCCUPIED | |
171 _occupied = 0; | |
172 #endif | |
173 _bm.clear(); | |
174 } | |
175 | |
176 void add_reference(oop* from) { | |
177 add_reference_work(from, /*parallel*/ true); | |
178 } | |
179 | |
180 void seq_add_reference(oop* from) { | |
181 add_reference_work(from, /*parallel*/ false); | |
182 } | |
183 | |
184 void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { | |
185 HeapWord* hr_bot = hr()->bottom(); | |
489
2494ab195856
6653214: MemoryPoolMXBean.setUsageThreshold() does not support large heap sizes.
swamyv
parents:
342
diff
changeset
|
186 size_t hr_first_card_index = ctbs->index_for(hr_bot); |
342 | 187 bm()->set_intersection_at_offset(*card_bm, hr_first_card_index); |
188 #if PRT_COUNT_OCCUPIED | |
189 recount_occupied(); | |
190 #endif | |
191 } | |
192 | |
193 void add_card(short from_card_index) { | |
194 add_card_work(from_card_index, /*parallel*/ true); | |
195 } | |
196 | |
197 void seq_add_card(short from_card_index) { | |
198 add_card_work(from_card_index, /*parallel*/ false); | |
199 } | |
200 | |
201 // (Destructively) union the bitmap of the current table into the given | |
202 // bitmap (which is assumed to be of the same size.) | |
203 void union_bitmap_into(BitMap* bm) { | |
204 bm->set_union(_bm); | |
205 } | |
206 | |
207 // Mem size in bytes. | |
208 size_t mem_size() const { | |
209 return sizeof(this) + _bm.size_in_words() * HeapWordSize; | |
210 } | |
211 | |
212 static size_t fl_mem_size() { | |
213 PerRegionTable* cur = _free_list; | |
214 size_t res = 0; | |
215 while (cur != NULL) { | |
216 res += sizeof(PerRegionTable); | |
217 cur = cur->next_free(); | |
218 } | |
219 return res; | |
220 } | |
221 | |
222 // Requires "from" to be in "hr()". | |
223 bool contains_reference(oop* from) const { | |
224 assert(hr()->is_in_reserved(from), "Precondition."); | |
225 size_t card_ind = pointer_delta(from, hr()->bottom(), | |
226 CardTableModRefBS::card_size); | |
227 return _bm.at(card_ind); | |
228 } | |
229 }; | |
230 | |
231 PerRegionTable* PerRegionTable::_free_list = NULL; | |
232 | |
233 | |
234 #define COUNT_PAR_EXPANDS 0 | |
235 | |
236 #if COUNT_PAR_EXPANDS | |
237 static jint n_par_expands = 0; | |
238 static jint n_par_contracts = 0; | |
239 static jint par_expand_list_len = 0; | |
240 static jint max_par_expand_list_len = 0; | |
241 | |
242 static void print_par_expand() { | |
243 Atomic::inc(&n_par_expands); | |
244 Atomic::inc(&par_expand_list_len); | |
245 if (par_expand_list_len > max_par_expand_list_len) { | |
246 max_par_expand_list_len = par_expand_list_len; | |
247 } | |
248 if ((n_par_expands % 10) == 0) { | |
249 gclog_or_tty->print_cr("\n\n%d par expands: %d contracts, " | |
250 "len = %d, max_len = %d\n.", | |
251 n_par_expands, n_par_contracts, par_expand_list_len, | |
252 max_par_expand_list_len); | |
253 } | |
254 } | |
255 #endif | |
256 | |
257 class PosParPRT: public PerRegionTable { | |
258 PerRegionTable** _par_tables; | |
259 | |
260 enum SomePrivateConstants { | |
261 ReserveParTableExpansion = 1 | |
262 }; | |
263 | |
264 void par_expand() { | |
265 int n = HeapRegionRemSet::num_par_rem_sets()-1; | |
266 if (n <= 0) return; | |
267 if (_par_tables == NULL) { | |
268 PerRegionTable* res = | |
269 (PerRegionTable*) | |
270 Atomic::cmpxchg_ptr((PerRegionTable*)ReserveParTableExpansion, | |
271 &_par_tables, NULL); | |
272 if (res != NULL) return; | |
273 // Otherwise, we reserved the right to do the expansion. | |
274 | |
275 PerRegionTable** ptables = NEW_C_HEAP_ARRAY(PerRegionTable*, n); | |
276 for (int i = 0; i < n; i++) { | |
277 PerRegionTable* ptable = PerRegionTable::alloc(hr()); | |
278 ptables[i] = ptable; | |
279 } | |
280 // Here we do not need an atomic. | |
281 _par_tables = ptables; | |
282 #if COUNT_PAR_EXPANDS | |
283 print_par_expand(); | |
284 #endif | |
285 // We must put this table on the expanded list. | |
286 PosParPRT* exp_head = _par_expanded_list; | |
287 while (true) { | |
288 set_next_par_expanded(exp_head); | |
289 PosParPRT* res = | |
290 (PosParPRT*) | |
291 Atomic::cmpxchg_ptr(this, &_par_expanded_list, exp_head); | |
292 if (res == exp_head) return; | |
293 // Otherwise. | |
294 exp_head = res; | |
295 } | |
296 ShouldNotReachHere(); | |
297 } | |
298 } | |
299 | |
300 void par_contract() { | |
301 assert(_par_tables != NULL, "Precondition."); | |
302 int n = HeapRegionRemSet::num_par_rem_sets()-1; | |
303 for (int i = 0; i < n; i++) { | |
304 _par_tables[i]->union_bitmap_into(bm()); | |
305 PerRegionTable::free(_par_tables[i]); | |
306 _par_tables[i] = NULL; | |
307 } | |
308 #if PRT_COUNT_OCCUPIED | |
309 // We must recount the "occupied." | |
310 recount_occupied(); | |
311 #endif | |
312 FREE_C_HEAP_ARRAY(PerRegionTable*, _par_tables); | |
313 _par_tables = NULL; | |
314 #if COUNT_PAR_EXPANDS | |
315 Atomic::inc(&n_par_contracts); | |
316 Atomic::dec(&par_expand_list_len); | |
317 #endif | |
318 } | |
319 | |
320 static PerRegionTable** _par_table_fl; | |
321 | |
322 PosParPRT* _next; | |
323 | |
324 static PosParPRT* _free_list; | |
325 | |
326 PerRegionTable** par_tables() const { | |
327 assert(uintptr_t(NULL) == 0, "Assumption."); | |
328 if (uintptr_t(_par_tables) <= ReserveParTableExpansion) | |
329 return NULL; | |
330 else | |
331 return _par_tables; | |
332 } | |
333 | |
334 PosParPRT* _next_par_expanded; | |
335 PosParPRT* next_par_expanded() { return _next_par_expanded; } | |
336 void set_next_par_expanded(PosParPRT* ppprt) { _next_par_expanded = ppprt; } | |
337 static PosParPRT* _par_expanded_list; | |
338 | |
339 public: | |
340 | |
341 PosParPRT(HeapRegion* hr) : PerRegionTable(hr), _par_tables(NULL) {} | |
342 | |
343 jint occupied() const { | |
344 jint res = PerRegionTable::occupied(); | |
345 if (par_tables() != NULL) { | |
346 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { | |
347 res += par_tables()[i]->occupied(); | |
348 } | |
349 } | |
350 return res; | |
351 } | |
352 | |
353 void init(HeapRegion* hr) { | |
354 PerRegionTable::init(hr); | |
355 _next = NULL; | |
356 if (par_tables() != NULL) { | |
357 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { | |
358 par_tables()[i]->init(hr); | |
359 } | |
360 } | |
361 } | |
362 | |
363 static void free(PosParPRT* prt) { | |
364 while (true) { | |
365 PosParPRT* fl = _free_list; | |
366 prt->set_next(fl); | |
367 PosParPRT* res = | |
368 (PosParPRT*) | |
369 Atomic::cmpxchg_ptr(prt, &_free_list, fl); | |
370 if (res == fl) return; | |
371 } | |
372 ShouldNotReachHere(); | |
373 } | |
374 | |
375 static PosParPRT* alloc(HeapRegion* hr) { | |
376 PosParPRT* fl = _free_list; | |
377 while (fl != NULL) { | |
378 PosParPRT* nxt = fl->next(); | |
379 PosParPRT* res = | |
380 (PosParPRT*) | |
381 Atomic::cmpxchg_ptr(nxt, &_free_list, fl); | |
382 if (res == fl) { | |
383 fl->init(hr); | |
384 return fl; | |
385 } else { | |
386 fl = _free_list; | |
387 } | |
388 } | |
389 assert(fl == NULL, "Loop condition."); | |
390 return new PosParPRT(hr); | |
391 } | |
392 | |
393 PosParPRT* next() const { return _next; } | |
394 void set_next(PosParPRT* nxt) { _next = nxt; } | |
395 PosParPRT** next_addr() { return &_next; } | |
396 | |
397 void add_reference(oop* from, int tid) { | |
398 // Expand if necessary. | |
399 PerRegionTable** pt = par_tables(); | |
400 if (par_tables() == NULL && tid > 0 && hr()->is_gc_alloc_region()) { | |
401 par_expand(); | |
402 pt = par_tables(); | |
403 } | |
404 if (pt != NULL) { | |
405 // We always have to assume that mods to table 0 are in parallel, | |
406 // because of the claiming scheme in parallel expansion. A thread | |
407 // with tid != 0 that finds the table to be NULL, but doesn't succeed | |
408 // in claiming the right of expanding it, will end up in the else | |
409 // clause of the above if test. That thread could be delayed, and a | |
410 // thread 0 add reference could see the table expanded, and come | |
411 // here. Both threads would be adding in parallel. But we get to | |
412 // not use atomics for tids > 0. | |
413 if (tid == 0) { | |
414 PerRegionTable::add_reference(from); | |
415 } else { | |
416 pt[tid-1]->seq_add_reference(from); | |
417 } | |
418 } else { | |
419 // Not expanded -- add to the base table. | |
420 PerRegionTable::add_reference(from); | |
421 } | |
422 } | |
423 | |
424 void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { | |
425 assert(_par_tables == NULL, "Precondition"); | |
426 PerRegionTable::scrub(ctbs, card_bm); | |
427 } | |
428 | |
429 size_t mem_size() const { | |
430 size_t res = | |
431 PerRegionTable::mem_size() + sizeof(this) - sizeof(PerRegionTable); | |
432 if (_par_tables != NULL) { | |
433 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { | |
434 res += _par_tables[i]->mem_size(); | |
435 } | |
436 } | |
437 return res; | |
438 } | |
439 | |
440 static size_t fl_mem_size() { | |
441 PosParPRT* cur = _free_list; | |
442 size_t res = 0; | |
443 while (cur != NULL) { | |
444 res += sizeof(PosParPRT); | |
445 cur = cur->next(); | |
446 } | |
447 return res; | |
448 } | |
449 | |
450 bool contains_reference(oop* from) const { | |
451 if (PerRegionTable::contains_reference(from)) return true; | |
452 if (_par_tables != NULL) { | |
453 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { | |
454 if (_par_tables[i]->contains_reference(from)) return true; | |
455 } | |
456 } | |
457 return false; | |
458 } | |
459 | |
460 static void par_contract_all(); | |
461 | |
462 }; | |
463 | |
464 void PosParPRT::par_contract_all() { | |
465 PosParPRT* hd = _par_expanded_list; | |
466 while (hd != NULL) { | |
467 PosParPRT* nxt = hd->next_par_expanded(); | |
468 PosParPRT* res = | |
469 (PosParPRT*) | |
470 Atomic::cmpxchg_ptr(nxt, &_par_expanded_list, hd); | |
471 if (res == hd) { | |
472 // We claimed the right to contract this table. | |
473 hd->set_next_par_expanded(NULL); | |
474 hd->par_contract(); | |
475 hd = _par_expanded_list; | |
476 } else { | |
477 hd = res; | |
478 } | |
479 } | |
480 } | |
481 | |
482 PosParPRT* PosParPRT::_free_list = NULL; | |
483 PosParPRT* PosParPRT::_par_expanded_list = NULL; | |
484 | |
485 jint OtherRegionsTable::_cache_probes = 0; | |
486 jint OtherRegionsTable::_cache_hits = 0; | |
487 | |
488 size_t OtherRegionsTable::_max_fine_entries = 0; | |
489 size_t OtherRegionsTable::_mod_max_fine_entries_mask = 0; | |
490 #if SAMPLE_FOR_EVICTION | |
491 size_t OtherRegionsTable::_fine_eviction_stride = 0; | |
492 size_t OtherRegionsTable::_fine_eviction_sample_size = 0; | |
493 #endif | |
494 | |
495 OtherRegionsTable::OtherRegionsTable(HeapRegion* hr) : | |
496 _g1h(G1CollectedHeap::heap()), | |
497 _m(Mutex::leaf, "An OtherRegionsTable lock", true), | |
498 _hr(hr), | |
499 _coarse_map(G1CollectedHeap::heap()->max_regions(), | |
500 false /* in-resource-area */), | |
501 _fine_grain_regions(NULL), | |
502 _n_fine_entries(0), _n_coarse_entries(0), | |
503 #if SAMPLE_FOR_EVICTION | |
504 _fine_eviction_start(0), | |
505 #endif | |
506 _sparse_table(hr) | |
507 { | |
508 typedef PosParPRT* PosParPRTPtr; | |
509 if (_max_fine_entries == 0) { | |
510 assert(_mod_max_fine_entries_mask == 0, "Both or none."); | |
511 _max_fine_entries = (1 << G1LogRSRegionEntries); | |
512 _mod_max_fine_entries_mask = _max_fine_entries - 1; | |
513 #if SAMPLE_FOR_EVICTION | |
514 assert(_fine_eviction_sample_size == 0 | |
515 && _fine_eviction_stride == 0, "All init at same time."); | |
516 _fine_eviction_sample_size = MAX2((size_t)4, (size_t)G1LogRSRegionEntries); | |
517 _fine_eviction_stride = _max_fine_entries / _fine_eviction_sample_size; | |
518 #endif | |
519 } | |
520 _fine_grain_regions = new PosParPRTPtr[_max_fine_entries]; | |
521 if (_fine_grain_regions == NULL) | |
522 vm_exit_out_of_memory(sizeof(void*)*_max_fine_entries, | |
523 "Failed to allocate _fine_grain_entries."); | |
524 for (size_t i = 0; i < _max_fine_entries; i++) { | |
525 _fine_grain_regions[i] = NULL; | |
526 } | |
527 } | |
528 | |
529 int** OtherRegionsTable::_from_card_cache = NULL; | |
530 size_t OtherRegionsTable::_from_card_cache_max_regions = 0; | |
531 size_t OtherRegionsTable::_from_card_cache_mem_size = 0; | |
532 | |
533 void OtherRegionsTable::init_from_card_cache(size_t max_regions) { | |
534 _from_card_cache_max_regions = max_regions; | |
535 | |
536 int n_par_rs = HeapRegionRemSet::num_par_rem_sets(); | |
537 _from_card_cache = NEW_C_HEAP_ARRAY(int*, n_par_rs); | |
538 for (int i = 0; i < n_par_rs; i++) { | |
539 _from_card_cache[i] = NEW_C_HEAP_ARRAY(int, max_regions); | |
540 for (size_t j = 0; j < max_regions; j++) { | |
541 _from_card_cache[i][j] = -1; // An invalid value. | |
542 } | |
543 } | |
544 _from_card_cache_mem_size = n_par_rs * max_regions * sizeof(int); | |
545 } | |
546 | |
547 void OtherRegionsTable::shrink_from_card_cache(size_t new_n_regs) { | |
548 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
549 assert(new_n_regs <= _from_card_cache_max_regions, "Must be within max."); | |
550 for (size_t j = new_n_regs; j < _from_card_cache_max_regions; j++) { | |
551 _from_card_cache[i][j] = -1; // An invalid value. | |
552 } | |
553 } | |
554 } | |
555 | |
556 #ifndef PRODUCT | |
557 void OtherRegionsTable::print_from_card_cache() { | |
558 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
559 for (size_t j = 0; j < _from_card_cache_max_regions; j++) { | |
560 gclog_or_tty->print_cr("_from_card_cache[%d][%d] = %d.", | |
561 i, j, _from_card_cache[i][j]); | |
562 } | |
563 } | |
564 } | |
565 #endif | |
566 | |
567 void OtherRegionsTable::add_reference(oop* from, int tid) { | |
568 size_t cur_hrs_ind = hr()->hrs_index(); | |
569 | |
570 #if HRRS_VERBOSE | |
571 gclog_or_tty->print_cr("ORT::add_reference_work(" PTR_FORMAT "->" PTR_FORMAT ").", | |
572 from, *from); | |
573 #endif | |
574 | |
575 int from_card = (int)(uintptr_t(from) >> CardTableModRefBS::card_shift); | |
576 | |
577 #if HRRS_VERBOSE | |
578 gclog_or_tty->print_cr("Table for [" PTR_FORMAT "...): card %d (cache = %d)", | |
579 hr()->bottom(), from_card, | |
580 _from_card_cache[tid][cur_hrs_ind]); | |
581 #endif | |
582 | |
583 #define COUNT_CACHE 0 | |
584 #if COUNT_CACHE | |
585 jint p = Atomic::add(1, &_cache_probes); | |
586 if ((p % 10000) == 0) { | |
587 jint hits = _cache_hits; | |
588 gclog_or_tty->print_cr("%d/%d = %5.2f%% RS cache hits.", | |
589 _cache_hits, p, 100.0* (float)hits/(float)p); | |
590 } | |
591 #endif | |
592 if (from_card == _from_card_cache[tid][cur_hrs_ind]) { | |
593 #if HRRS_VERBOSE | |
594 gclog_or_tty->print_cr(" from-card cache hit."); | |
595 #endif | |
596 #if COUNT_CACHE | |
597 Atomic::inc(&_cache_hits); | |
598 #endif | |
599 assert(contains_reference(from), "We just added it!"); | |
600 return; | |
601 } else { | |
602 _from_card_cache[tid][cur_hrs_ind] = from_card; | |
603 } | |
604 | |
605 // Note that this may be a continued H region. | |
606 HeapRegion* from_hr = _g1h->heap_region_containing_raw(from); | |
607 size_t from_hrs_ind = (size_t)from_hr->hrs_index(); | |
608 | |
609 // If the region is already coarsened, return. | |
610 if (_coarse_map.at(from_hrs_ind)) { | |
611 #if HRRS_VERBOSE | |
612 gclog_or_tty->print_cr(" coarse map hit."); | |
613 #endif | |
614 assert(contains_reference(from), "We just added it!"); | |
615 return; | |
616 } | |
617 | |
618 // Otherwise find a per-region table to add it to. | |
619 size_t ind = from_hrs_ind & _mod_max_fine_entries_mask; | |
620 PosParPRT* prt = find_region_table(ind, from_hr); | |
621 if (prt == NULL) { | |
622 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
623 // Confirm that it's really not there... | |
624 prt = find_region_table(ind, from_hr); | |
625 if (prt == NULL) { | |
626 | |
627 uintptr_t from_hr_bot_card_index = | |
628 uintptr_t(from_hr->bottom()) | |
629 >> CardTableModRefBS::card_shift; | |
630 int card_index = from_card - from_hr_bot_card_index; | |
631 assert(0 <= card_index && card_index < PosParPRT::CardsPerRegion, | |
632 "Must be in range."); | |
633 if (G1HRRSUseSparseTable && | |
634 _sparse_table.add_card((short) from_hrs_ind, card_index)) { | |
635 if (G1RecordHRRSOops) { | |
636 HeapRegionRemSet::record(hr(), from); | |
637 #if HRRS_VERBOSE | |
638 gclog_or_tty->print(" Added card " PTR_FORMAT " to region " | |
639 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", | |
640 align_size_down(uintptr_t(from), | |
641 CardTableModRefBS::card_size), | |
642 hr()->bottom(), from); | |
643 #endif | |
644 } | |
645 #if HRRS_VERBOSE | |
646 gclog_or_tty->print_cr(" added card to sparse table."); | |
647 #endif | |
648 assert(contains_reference_locked(from), "We just added it!"); | |
649 return; | |
650 } else { | |
651 #if HRRS_VERBOSE | |
652 gclog_or_tty->print_cr(" [tid %d] sparse table entry " | |
653 "overflow(f: %d, t: %d)", | |
654 tid, from_hrs_ind, cur_hrs_ind); | |
655 #endif | |
656 } | |
657 | |
658 // Otherwise, transfer from sparse to fine-grain. | |
659 short cards[SparsePRTEntry::CardsPerEntry]; | |
660 if (G1HRRSUseSparseTable) { | |
661 bool res = _sparse_table.get_cards((short) from_hrs_ind, &cards[0]); | |
662 assert(res, "There should have been an entry"); | |
663 } | |
664 | |
665 if (_n_fine_entries == _max_fine_entries) { | |
666 prt = delete_region_table(); | |
667 } else { | |
668 prt = PosParPRT::alloc(from_hr); | |
669 } | |
670 prt->init(from_hr); | |
671 // Record the outgoing pointer in the from_region's outgoing bitmap. | |
672 from_hr->rem_set()->add_outgoing_reference(hr()); | |
673 | |
674 PosParPRT* first_prt = _fine_grain_regions[ind]; | |
675 prt->set_next(first_prt); // XXX Maybe move to init? | |
676 _fine_grain_regions[ind] = prt; | |
677 _n_fine_entries++; | |
678 | |
679 // Add in the cards from the sparse table. | |
680 if (G1HRRSUseSparseTable) { | |
681 for (int i = 0; i < SparsePRTEntry::CardsPerEntry; i++) { | |
682 short c = cards[i]; | |
683 if (c != SparsePRTEntry::NullEntry) { | |
684 prt->add_card(c); | |
685 } | |
686 } | |
687 // Now we can delete the sparse entry. | |
688 bool res = _sparse_table.delete_entry((short) from_hrs_ind); | |
689 assert(res, "It should have been there."); | |
690 } | |
691 } | |
692 assert(prt != NULL && prt->hr() == from_hr, "consequence"); | |
693 } | |
694 // Note that we can't assert "prt->hr() == from_hr", because of the | |
695 // possibility of concurrent reuse. But see head comment of | |
696 // OtherRegionsTable for why this is OK. | |
697 assert(prt != NULL, "Inv"); | |
698 | |
699 prt->add_reference(from, tid); | |
700 if (G1RecordHRRSOops) { | |
701 HeapRegionRemSet::record(hr(), from); | |
702 #if HRRS_VERBOSE | |
703 gclog_or_tty->print("Added card " PTR_FORMAT " to region " | |
704 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", | |
705 align_size_down(uintptr_t(from), | |
706 CardTableModRefBS::card_size), | |
707 hr()->bottom(), from); | |
708 #endif | |
709 } | |
710 assert(contains_reference(from), "We just added it!"); | |
711 } | |
712 | |
713 PosParPRT* | |
714 OtherRegionsTable::find_region_table(size_t ind, HeapRegion* hr) const { | |
715 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
716 PosParPRT* prt = _fine_grain_regions[ind]; | |
717 while (prt != NULL && prt->hr() != hr) { | |
718 prt = prt->next(); | |
719 } | |
720 // Loop postcondition is the method postcondition. | |
721 return prt; | |
722 } | |
723 | |
724 | |
725 #define DRT_CENSUS 0 | |
726 | |
727 #if DRT_CENSUS | |
728 static const int HistoSize = 6; | |
729 static int global_histo[HistoSize] = { 0, 0, 0, 0, 0, 0 }; | |
730 static int coarsenings = 0; | |
731 static int occ_sum = 0; | |
732 #endif | |
733 | |
734 jint OtherRegionsTable::_n_coarsenings = 0; | |
735 | |
736 PosParPRT* OtherRegionsTable::delete_region_table() { | |
737 #if DRT_CENSUS | |
738 int histo[HistoSize] = { 0, 0, 0, 0, 0, 0 }; | |
739 const int histo_limits[] = { 1, 4, 16, 64, 256, 2048 }; | |
740 #endif | |
741 | |
742 assert(_m.owned_by_self(), "Precondition"); | |
743 assert(_n_fine_entries == _max_fine_entries, "Precondition"); | |
744 PosParPRT* max = NULL; | |
745 jint max_occ = 0; | |
746 PosParPRT** max_prev; | |
747 size_t max_ind; | |
748 | |
749 #if SAMPLE_FOR_EVICTION | |
750 size_t i = _fine_eviction_start; | |
751 for (size_t k = 0; k < _fine_eviction_sample_size; k++) { | |
752 size_t ii = i; | |
753 // Make sure we get a non-NULL sample. | |
754 while (_fine_grain_regions[ii] == NULL) { | |
755 ii++; | |
756 if (ii == _max_fine_entries) ii = 0; | |
757 guarantee(ii != i, "We must find one."); | |
758 } | |
759 PosParPRT** prev = &_fine_grain_regions[ii]; | |
760 PosParPRT* cur = *prev; | |
761 while (cur != NULL) { | |
762 jint cur_occ = cur->occupied(); | |
763 if (max == NULL || cur_occ > max_occ) { | |
764 max = cur; | |
765 max_prev = prev; | |
766 max_ind = i; | |
767 max_occ = cur_occ; | |
768 } | |
769 prev = cur->next_addr(); | |
770 cur = cur->next(); | |
771 } | |
772 i = i + _fine_eviction_stride; | |
773 if (i >= _n_fine_entries) i = i - _n_fine_entries; | |
774 } | |
775 _fine_eviction_start++; | |
776 if (_fine_eviction_start >= _n_fine_entries) | |
777 _fine_eviction_start -= _n_fine_entries; | |
778 #else | |
779 for (int i = 0; i < _max_fine_entries; i++) { | |
780 PosParPRT** prev = &_fine_grain_regions[i]; | |
781 PosParPRT* cur = *prev; | |
782 while (cur != NULL) { | |
783 jint cur_occ = cur->occupied(); | |
784 #if DRT_CENSUS | |
785 for (int k = 0; k < HistoSize; k++) { | |
786 if (cur_occ <= histo_limits[k]) { | |
787 histo[k]++; global_histo[k]++; break; | |
788 } | |
789 } | |
790 #endif | |
791 if (max == NULL || cur_occ > max_occ) { | |
792 max = cur; | |
793 max_prev = prev; | |
794 max_ind = i; | |
795 max_occ = cur_occ; | |
796 } | |
797 prev = cur->next_addr(); | |
798 cur = cur->next(); | |
799 } | |
800 } | |
801 #endif | |
802 // XXX | |
803 guarantee(max != NULL, "Since _n_fine_entries > 0"); | |
804 #if DRT_CENSUS | |
805 gclog_or_tty->print_cr("In a coarsening: histo of occs:"); | |
806 for (int k = 0; k < HistoSize; k++) { | |
807 gclog_or_tty->print_cr(" <= %4d: %5d.", histo_limits[k], histo[k]); | |
808 } | |
809 coarsenings++; | |
810 occ_sum += max_occ; | |
811 if ((coarsenings % 100) == 0) { | |
812 gclog_or_tty->print_cr("\ncoarsenings = %d; global summary:", coarsenings); | |
813 for (int k = 0; k < HistoSize; k++) { | |
814 gclog_or_tty->print_cr(" <= %4d: %5d.", histo_limits[k], global_histo[k]); | |
815 } | |
816 gclog_or_tty->print_cr("Avg occ of deleted region = %6.2f.", | |
817 (float)occ_sum/(float)coarsenings); | |
818 } | |
819 #endif | |
820 | |
821 // Set the corresponding coarse bit. | |
822 int max_hrs_index = max->hr()->hrs_index(); | |
823 if (!_coarse_map.at(max_hrs_index)) { | |
824 _coarse_map.at_put(max_hrs_index, true); | |
825 _n_coarse_entries++; | |
826 #if 0 | |
827 gclog_or_tty->print("Coarsened entry in region [" PTR_FORMAT "...] " | |
828 "for region [" PTR_FORMAT "...] (%d coarse entries).\n", | |
829 hr()->bottom(), | |
830 max->hr()->bottom(), | |
831 _n_coarse_entries); | |
832 #endif | |
833 } | |
834 | |
835 // Unsplice. | |
836 *max_prev = max->next(); | |
837 Atomic::inc(&_n_coarsenings); | |
838 _n_fine_entries--; | |
839 return max; | |
840 } | |
841 | |
842 | |
843 // At present, this must be called stop-world single-threaded. | |
844 void OtherRegionsTable::scrub(CardTableModRefBS* ctbs, | |
845 BitMap* region_bm, BitMap* card_bm) { | |
846 // First eliminated garbage regions from the coarse map. | |
847 if (G1RSScrubVerbose) | |
848 gclog_or_tty->print_cr("Scrubbing region %d:", hr()->hrs_index()); | |
849 | |
850 assert(_coarse_map.size() == region_bm->size(), "Precondition"); | |
851 if (G1RSScrubVerbose) | |
852 gclog_or_tty->print(" Coarse map: before = %d...", _n_coarse_entries); | |
853 _coarse_map.set_intersection(*region_bm); | |
854 _n_coarse_entries = _coarse_map.count_one_bits(); | |
855 if (G1RSScrubVerbose) | |
856 gclog_or_tty->print_cr(" after = %d.", _n_coarse_entries); | |
857 | |
858 // Now do the fine-grained maps. | |
859 for (size_t i = 0; i < _max_fine_entries; i++) { | |
860 PosParPRT* cur = _fine_grain_regions[i]; | |
861 PosParPRT** prev = &_fine_grain_regions[i]; | |
862 while (cur != NULL) { | |
863 PosParPRT* nxt = cur->next(); | |
864 // If the entire region is dead, eliminate. | |
865 if (G1RSScrubVerbose) | |
866 gclog_or_tty->print_cr(" For other region %d:", cur->hr()->hrs_index()); | |
867 if (!region_bm->at(cur->hr()->hrs_index())) { | |
868 *prev = nxt; | |
869 cur->set_next(NULL); | |
870 _n_fine_entries--; | |
871 if (G1RSScrubVerbose) | |
872 gclog_or_tty->print_cr(" deleted via region map."); | |
873 PosParPRT::free(cur); | |
874 } else { | |
875 // Do fine-grain elimination. | |
876 if (G1RSScrubVerbose) | |
877 gclog_or_tty->print(" occ: before = %4d.", cur->occupied()); | |
878 cur->scrub(ctbs, card_bm); | |
879 if (G1RSScrubVerbose) | |
880 gclog_or_tty->print_cr(" after = %4d.", cur->occupied()); | |
881 // Did that empty the table completely? | |
882 if (cur->occupied() == 0) { | |
883 *prev = nxt; | |
884 cur->set_next(NULL); | |
885 _n_fine_entries--; | |
886 PosParPRT::free(cur); | |
887 } else { | |
888 prev = cur->next_addr(); | |
889 } | |
890 } | |
891 cur = nxt; | |
892 } | |
893 } | |
894 // Since we may have deleted a from_card_cache entry from the RS, clear | |
895 // the FCC. | |
896 clear_fcc(); | |
897 } | |
898 | |
899 | |
900 size_t OtherRegionsTable::occupied() const { | |
901 // Cast away const in this case. | |
902 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
903 size_t sum = occ_fine(); | |
904 sum += occ_sparse(); | |
905 sum += occ_coarse(); | |
906 return sum; | |
907 } | |
908 | |
909 size_t OtherRegionsTable::occ_fine() const { | |
910 size_t sum = 0; | |
911 for (size_t i = 0; i < _max_fine_entries; i++) { | |
912 PosParPRT* cur = _fine_grain_regions[i]; | |
913 while (cur != NULL) { | |
914 sum += cur->occupied(); | |
915 cur = cur->next(); | |
916 } | |
917 } | |
918 return sum; | |
919 } | |
920 | |
921 size_t OtherRegionsTable::occ_coarse() const { | |
922 return (_n_coarse_entries * PosParPRT::CardsPerRegion); | |
923 } | |
924 | |
925 size_t OtherRegionsTable::occ_sparse() const { | |
926 return _sparse_table.occupied(); | |
927 } | |
928 | |
929 size_t OtherRegionsTable::mem_size() const { | |
930 // Cast away const in this case. | |
931 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
932 size_t sum = 0; | |
933 for (size_t i = 0; i < _max_fine_entries; i++) { | |
934 PosParPRT* cur = _fine_grain_regions[i]; | |
935 while (cur != NULL) { | |
936 sum += cur->mem_size(); | |
937 cur = cur->next(); | |
938 } | |
939 } | |
940 sum += (sizeof(PosParPRT*) * _max_fine_entries); | |
941 sum += (_coarse_map.size_in_words() * HeapWordSize); | |
942 sum += (_sparse_table.mem_size()); | |
943 sum += sizeof(*this) - sizeof(_sparse_table); // Avoid double counting above. | |
944 return sum; | |
945 } | |
946 | |
947 size_t OtherRegionsTable::static_mem_size() { | |
948 return _from_card_cache_mem_size; | |
949 } | |
950 | |
951 size_t OtherRegionsTable::fl_mem_size() { | |
952 return PerRegionTable::fl_mem_size() + PosParPRT::fl_mem_size(); | |
953 } | |
954 | |
955 void OtherRegionsTable::clear_fcc() { | |
956 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
957 _from_card_cache[i][hr()->hrs_index()] = -1; | |
958 } | |
959 } | |
960 | |
961 void OtherRegionsTable::clear() { | |
962 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
963 for (size_t i = 0; i < _max_fine_entries; i++) { | |
964 PosParPRT* cur = _fine_grain_regions[i]; | |
965 while (cur != NULL) { | |
966 PosParPRT* nxt = cur->next(); | |
967 PosParPRT::free(cur); | |
968 cur = nxt; | |
969 } | |
970 _fine_grain_regions[i] = NULL; | |
971 } | |
972 _sparse_table.clear(); | |
973 _coarse_map.clear(); | |
974 _n_fine_entries = 0; | |
975 _n_coarse_entries = 0; | |
976 | |
977 clear_fcc(); | |
978 } | |
979 | |
980 void OtherRegionsTable::clear_incoming_entry(HeapRegion* from_hr) { | |
981 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
982 size_t hrs_ind = (size_t)from_hr->hrs_index(); | |
983 size_t ind = hrs_ind & _mod_max_fine_entries_mask; | |
984 if (del_single_region_table(ind, from_hr)) { | |
985 assert(!_coarse_map.at(hrs_ind), "Inv"); | |
986 } else { | |
987 _coarse_map.par_at_put(hrs_ind, 0); | |
988 } | |
989 // Check to see if any of the fcc entries come from here. | |
990 int hr_ind = hr()->hrs_index(); | |
991 for (int tid = 0; tid < HeapRegionRemSet::num_par_rem_sets(); tid++) { | |
992 int fcc_ent = _from_card_cache[tid][hr_ind]; | |
993 if (fcc_ent != -1) { | |
994 HeapWord* card_addr = (HeapWord*) | |
995 (uintptr_t(fcc_ent) << CardTableModRefBS::card_shift); | |
996 if (hr()->is_in_reserved(card_addr)) { | |
997 // Clear the from card cache. | |
998 _from_card_cache[tid][hr_ind] = -1; | |
999 } | |
1000 } | |
1001 } | |
1002 } | |
1003 | |
1004 bool OtherRegionsTable::del_single_region_table(size_t ind, | |
1005 HeapRegion* hr) { | |
1006 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
1007 PosParPRT** prev_addr = &_fine_grain_regions[ind]; | |
1008 PosParPRT* prt = *prev_addr; | |
1009 while (prt != NULL && prt->hr() != hr) { | |
1010 prev_addr = prt->next_addr(); | |
1011 prt = prt->next(); | |
1012 } | |
1013 if (prt != NULL) { | |
1014 assert(prt->hr() == hr, "Loop postcondition."); | |
1015 *prev_addr = prt->next(); | |
1016 PosParPRT::free(prt); | |
1017 _n_fine_entries--; | |
1018 return true; | |
1019 } else { | |
1020 return false; | |
1021 } | |
1022 } | |
1023 | |
1024 bool OtherRegionsTable::contains_reference(oop* from) const { | |
1025 // Cast away const in this case. | |
1026 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
1027 return contains_reference_locked(from); | |
1028 } | |
1029 | |
1030 bool OtherRegionsTable::contains_reference_locked(oop* from) const { | |
1031 HeapRegion* hr = _g1h->heap_region_containing_raw(from); | |
1032 if (hr == NULL) return false; | |
1033 size_t hr_ind = hr->hrs_index(); | |
1034 // Is this region in the coarse map? | |
1035 if (_coarse_map.at(hr_ind)) return true; | |
1036 | |
1037 PosParPRT* prt = find_region_table(hr_ind & _mod_max_fine_entries_mask, | |
1038 hr); | |
1039 if (prt != NULL) { | |
1040 return prt->contains_reference(from); | |
1041 | |
1042 } else { | |
1043 uintptr_t from_card = | |
1044 (uintptr_t(from) >> CardTableModRefBS::card_shift); | |
1045 uintptr_t hr_bot_card_index = | |
1046 uintptr_t(hr->bottom()) >> CardTableModRefBS::card_shift; | |
1047 assert(from_card >= hr_bot_card_index, "Inv"); | |
1048 int card_index = from_card - hr_bot_card_index; | |
1049 return _sparse_table.contains_card((short)hr_ind, card_index); | |
1050 } | |
1051 | |
1052 | |
1053 } | |
1054 | |
1055 | |
1056 bool HeapRegionRemSet::_par_traversal = false; | |
1057 | |
1058 void HeapRegionRemSet::set_par_traversal(bool b) { | |
1059 assert(_par_traversal != b, "Proper alternation..."); | |
1060 _par_traversal = b; | |
1061 } | |
1062 | |
1063 int HeapRegionRemSet::num_par_rem_sets() { | |
1064 // We always have at least two, so that a mutator thread can claim an | |
1065 // id and add to a rem set. | |
1066 return (int) MAX2(ParallelGCThreads, (size_t)2); | |
1067 } | |
1068 | |
1069 HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, | |
1070 HeapRegion* hr) | |
1071 : _bosa(bosa), _other_regions(hr), | |
1072 _outgoing_region_map(G1CollectedHeap::heap()->max_regions(), | |
1073 false /* in-resource-area */), | |
1074 _iter_state(Unclaimed) | |
1075 {} | |
1076 | |
1077 | |
1078 void HeapRegionRemSet::init_for_par_iteration() { | |
1079 _iter_state = Unclaimed; | |
1080 } | |
1081 | |
1082 bool HeapRegionRemSet::claim_iter() { | |
1083 if (_iter_state != Unclaimed) return false; | |
1084 jint res = Atomic::cmpxchg(Claimed, (jint*)(&_iter_state), Unclaimed); | |
1085 return (res == Unclaimed); | |
1086 } | |
1087 | |
1088 void HeapRegionRemSet::set_iter_complete() { | |
1089 _iter_state = Complete; | |
1090 } | |
1091 | |
1092 bool HeapRegionRemSet::iter_is_complete() { | |
1093 return _iter_state == Complete; | |
1094 } | |
1095 | |
1096 | |
1097 void HeapRegionRemSet::init_iterator(HeapRegionRemSetIterator* iter) const { | |
1098 iter->initialize(this); | |
1099 } | |
1100 | |
1101 #ifndef PRODUCT | |
1102 void HeapRegionRemSet::print() const { | |
1103 HeapRegionRemSetIterator iter; | |
1104 init_iterator(&iter); | |
1105 size_t card_index; | |
1106 while (iter.has_next(card_index)) { | |
1107 HeapWord* card_start = | |
1108 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
1109 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); | |
1110 } | |
1111 // XXX | |
1112 if (iter.n_yielded() != occupied()) { | |
1113 gclog_or_tty->print_cr("Yielded disagrees with occupied:"); | |
1114 gclog_or_tty->print_cr(" %6d yielded (%6d coarse, %6d fine).", | |
1115 iter.n_yielded(), | |
1116 iter.n_yielded_coarse(), iter.n_yielded_fine()); | |
1117 gclog_or_tty->print_cr(" %6d occ (%6d coarse, %6d fine).", | |
1118 occupied(), occ_coarse(), occ_fine()); | |
1119 } | |
1120 guarantee(iter.n_yielded() == occupied(), | |
1121 "We should have yielded all the represented cards."); | |
1122 } | |
1123 #endif | |
1124 | |
1125 void HeapRegionRemSet::cleanup() { | |
1126 SparsePRT::cleanup_all(); | |
1127 } | |
1128 | |
1129 void HeapRegionRemSet::par_cleanup() { | |
1130 PosParPRT::par_contract_all(); | |
1131 } | |
1132 | |
1133 void HeapRegionRemSet::add_outgoing_reference(HeapRegion* to_hr) { | |
1134 _outgoing_region_map.par_at_put(to_hr->hrs_index(), 1); | |
1135 } | |
1136 | |
1137 void HeapRegionRemSet::clear() { | |
1138 clear_outgoing_entries(); | |
1139 _outgoing_region_map.clear(); | |
1140 _other_regions.clear(); | |
1141 assert(occupied() == 0, "Should be clear."); | |
1142 } | |
1143 | |
1144 void HeapRegionRemSet::clear_outgoing_entries() { | |
1145 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1146 size_t i = _outgoing_region_map.get_next_one_offset(0); | |
1147 while (i < _outgoing_region_map.size()) { | |
1148 HeapRegion* to_region = g1h->region_at(i); | |
545 | 1149 if (!to_region->in_collection_set()) { |
1150 to_region->rem_set()->clear_incoming_entry(hr()); | |
1151 } | |
342 | 1152 i = _outgoing_region_map.get_next_one_offset(i+1); |
1153 } | |
1154 } | |
1155 | |
1156 | |
1157 void HeapRegionRemSet::scrub(CardTableModRefBS* ctbs, | |
1158 BitMap* region_bm, BitMap* card_bm) { | |
1159 _other_regions.scrub(ctbs, region_bm, card_bm); | |
1160 } | |
1161 | |
1162 //-------------------- Iteration -------------------- | |
1163 | |
1164 HeapRegionRemSetIterator:: | |
1165 HeapRegionRemSetIterator() : | |
1166 _hrrs(NULL), | |
1167 _g1h(G1CollectedHeap::heap()), | |
1168 _bosa(NULL), | |
1169 _sparse_iter(size_t(G1CollectedHeap::heap()->reserved_region().start()) | |
1170 >> CardTableModRefBS::card_shift) | |
1171 {} | |
1172 | |
1173 void HeapRegionRemSetIterator::initialize(const HeapRegionRemSet* hrrs) { | |
1174 _hrrs = hrrs; | |
1175 _coarse_map = &_hrrs->_other_regions._coarse_map; | |
1176 _fine_grain_regions = _hrrs->_other_regions._fine_grain_regions; | |
1177 _bosa = _hrrs->bosa(); | |
1178 | |
1179 _is = Sparse; | |
1180 // Set these values so that we increment to the first region. | |
1181 _coarse_cur_region_index = -1; | |
1182 _coarse_cur_region_cur_card = (PosParPRT::CardsPerRegion-1);; | |
1183 | |
1184 _cur_region_cur_card = 0; | |
1185 | |
1186 _fine_array_index = -1; | |
1187 _fine_cur_prt = NULL; | |
1188 | |
1189 _n_yielded_coarse = 0; | |
1190 _n_yielded_fine = 0; | |
1191 _n_yielded_sparse = 0; | |
1192 | |
1193 _sparse_iter.init(&hrrs->_other_regions._sparse_table); | |
1194 } | |
1195 | |
1196 bool HeapRegionRemSetIterator::coarse_has_next(size_t& card_index) { | |
1197 if (_hrrs->_other_regions._n_coarse_entries == 0) return false; | |
1198 // Go to the next card. | |
1199 _coarse_cur_region_cur_card++; | |
1200 // Was the last the last card in the current region? | |
1201 if (_coarse_cur_region_cur_card == PosParPRT::CardsPerRegion) { | |
1202 // Yes: find the next region. This may leave _coarse_cur_region_index | |
1203 // Set to the last index, in which case there are no more coarse | |
1204 // regions. | |
1205 _coarse_cur_region_index = | |
1206 (int) _coarse_map->get_next_one_offset(_coarse_cur_region_index + 1); | |
1207 if ((size_t)_coarse_cur_region_index < _coarse_map->size()) { | |
1208 _coarse_cur_region_cur_card = 0; | |
1209 HeapWord* r_bot = | |
1210 _g1h->region_at(_coarse_cur_region_index)->bottom(); | |
1211 _cur_region_card_offset = _bosa->index_for(r_bot); | |
1212 } else { | |
1213 return false; | |
1214 } | |
1215 } | |
1216 // If we didn't return false above, then we can yield a card. | |
1217 card_index = _cur_region_card_offset + _coarse_cur_region_cur_card; | |
1218 return true; | |
1219 } | |
1220 | |
1221 void HeapRegionRemSetIterator::fine_find_next_non_null_prt() { | |
1222 // Otherwise, find the next bucket list in the array. | |
1223 _fine_array_index++; | |
1224 while (_fine_array_index < (int) OtherRegionsTable::_max_fine_entries) { | |
1225 _fine_cur_prt = _fine_grain_regions[_fine_array_index]; | |
1226 if (_fine_cur_prt != NULL) return; | |
1227 else _fine_array_index++; | |
1228 } | |
1229 assert(_fine_cur_prt == NULL, "Loop post"); | |
1230 } | |
1231 | |
1232 bool HeapRegionRemSetIterator::fine_has_next(size_t& card_index) { | |
1233 if (fine_has_next()) { | |
1234 _cur_region_cur_card = | |
1235 _fine_cur_prt->_bm.get_next_one_offset(_cur_region_cur_card + 1); | |
1236 } | |
1237 while (!fine_has_next()) { | |
1238 if (_cur_region_cur_card == PosParPRT::CardsPerRegion) { | |
1239 _cur_region_cur_card = 0; | |
1240 _fine_cur_prt = _fine_cur_prt->next(); | |
1241 } | |
1242 if (_fine_cur_prt == NULL) { | |
1243 fine_find_next_non_null_prt(); | |
1244 if (_fine_cur_prt == NULL) return false; | |
1245 } | |
1246 assert(_fine_cur_prt != NULL && _cur_region_cur_card == 0, | |
1247 "inv."); | |
1248 HeapWord* r_bot = | |
1249 _fine_cur_prt->hr()->bottom(); | |
1250 _cur_region_card_offset = _bosa->index_for(r_bot); | |
1251 _cur_region_cur_card = _fine_cur_prt->_bm.get_next_one_offset(0); | |
1252 } | |
1253 assert(fine_has_next(), "Or else we exited the loop via the return."); | |
1254 card_index = _cur_region_card_offset + _cur_region_cur_card; | |
1255 return true; | |
1256 } | |
1257 | |
1258 bool HeapRegionRemSetIterator::fine_has_next() { | |
1259 return | |
1260 _fine_cur_prt != NULL && | |
1261 _cur_region_cur_card < PosParPRT::CardsPerRegion; | |
1262 } | |
1263 | |
1264 bool HeapRegionRemSetIterator::has_next(size_t& card_index) { | |
1265 switch (_is) { | |
1266 case Sparse: | |
1267 if (_sparse_iter.has_next(card_index)) { | |
1268 _n_yielded_sparse++; | |
1269 return true; | |
1270 } | |
1271 // Otherwise, deliberate fall-through | |
1272 _is = Fine; | |
1273 case Fine: | |
1274 if (fine_has_next(card_index)) { | |
1275 _n_yielded_fine++; | |
1276 return true; | |
1277 } | |
1278 // Otherwise, deliberate fall-through | |
1279 _is = Coarse; | |
1280 case Coarse: | |
1281 if (coarse_has_next(card_index)) { | |
1282 _n_yielded_coarse++; | |
1283 return true; | |
1284 } | |
1285 // Otherwise... | |
1286 break; | |
1287 } | |
1288 assert(ParallelGCThreads > 1 || | |
1289 n_yielded() == _hrrs->occupied(), | |
1290 "Should have yielded all the cards in the rem set " | |
1291 "(in the non-par case)."); | |
1292 return false; | |
1293 } | |
1294 | |
1295 | |
1296 | |
1297 oop** HeapRegionRemSet::_recorded_oops = NULL; | |
1298 HeapWord** HeapRegionRemSet::_recorded_cards = NULL; | |
1299 HeapRegion** HeapRegionRemSet::_recorded_regions = NULL; | |
1300 int HeapRegionRemSet::_n_recorded = 0; | |
1301 | |
1302 HeapRegionRemSet::Event* HeapRegionRemSet::_recorded_events = NULL; | |
1303 int* HeapRegionRemSet::_recorded_event_index = NULL; | |
1304 int HeapRegionRemSet::_n_recorded_events = 0; | |
1305 | |
1306 void HeapRegionRemSet::record(HeapRegion* hr, oop* f) { | |
1307 if (_recorded_oops == NULL) { | |
1308 assert(_n_recorded == 0 | |
1309 && _recorded_cards == NULL | |
1310 && _recorded_regions == NULL, | |
1311 "Inv"); | |
1312 _recorded_oops = NEW_C_HEAP_ARRAY(oop*, MaxRecorded); | |
1313 _recorded_cards = NEW_C_HEAP_ARRAY(HeapWord*, MaxRecorded); | |
1314 _recorded_regions = NEW_C_HEAP_ARRAY(HeapRegion*, MaxRecorded); | |
1315 } | |
1316 if (_n_recorded == MaxRecorded) { | |
1317 gclog_or_tty->print_cr("Filled up 'recorded' (%d).", MaxRecorded); | |
1318 } else { | |
1319 _recorded_cards[_n_recorded] = | |
1320 (HeapWord*)align_size_down(uintptr_t(f), | |
1321 CardTableModRefBS::card_size); | |
1322 _recorded_oops[_n_recorded] = f; | |
1323 _recorded_regions[_n_recorded] = hr; | |
1324 _n_recorded++; | |
1325 } | |
1326 } | |
1327 | |
1328 void HeapRegionRemSet::record_event(Event evnt) { | |
1329 if (!G1RecordHRRSEvents) return; | |
1330 | |
1331 if (_recorded_events == NULL) { | |
1332 assert(_n_recorded_events == 0 | |
1333 && _recorded_event_index == NULL, | |
1334 "Inv"); | |
1335 _recorded_events = NEW_C_HEAP_ARRAY(Event, MaxRecordedEvents); | |
1336 _recorded_event_index = NEW_C_HEAP_ARRAY(int, MaxRecordedEvents); | |
1337 } | |
1338 if (_n_recorded_events == MaxRecordedEvents) { | |
1339 gclog_or_tty->print_cr("Filled up 'recorded_events' (%d).", MaxRecordedEvents); | |
1340 } else { | |
1341 _recorded_events[_n_recorded_events] = evnt; | |
1342 _recorded_event_index[_n_recorded_events] = _n_recorded; | |
1343 _n_recorded_events++; | |
1344 } | |
1345 } | |
1346 | |
1347 void HeapRegionRemSet::print_event(outputStream* str, Event evnt) { | |
1348 switch (evnt) { | |
1349 case Event_EvacStart: | |
1350 str->print("Evac Start"); | |
1351 break; | |
1352 case Event_EvacEnd: | |
1353 str->print("Evac End"); | |
1354 break; | |
1355 case Event_RSUpdateEnd: | |
1356 str->print("RS Update End"); | |
1357 break; | |
1358 } | |
1359 } | |
1360 | |
1361 void HeapRegionRemSet::print_recorded() { | |
1362 int cur_evnt = 0; | |
1363 Event cur_evnt_kind; | |
1364 int cur_evnt_ind = 0; | |
1365 if (_n_recorded_events > 0) { | |
1366 cur_evnt_kind = _recorded_events[cur_evnt]; | |
1367 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
1368 } | |
1369 | |
1370 for (int i = 0; i < _n_recorded; i++) { | |
1371 while (cur_evnt < _n_recorded_events && i == cur_evnt_ind) { | |
1372 gclog_or_tty->print("Event: "); | |
1373 print_event(gclog_or_tty, cur_evnt_kind); | |
1374 gclog_or_tty->print_cr(""); | |
1375 cur_evnt++; | |
1376 if (cur_evnt < MaxRecordedEvents) { | |
1377 cur_evnt_kind = _recorded_events[cur_evnt]; | |
1378 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
1379 } | |
1380 } | |
1381 gclog_or_tty->print("Added card " PTR_FORMAT " to region [" PTR_FORMAT "...]" | |
1382 " for ref " PTR_FORMAT ".\n", | |
1383 _recorded_cards[i], _recorded_regions[i]->bottom(), | |
1384 _recorded_oops[i]); | |
1385 } | |
1386 } | |
1387 | |
1388 #ifndef PRODUCT | |
1389 void HeapRegionRemSet::test() { | |
1390 os::sleep(Thread::current(), (jlong)5000, false); | |
1391 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1392 | |
1393 // Run with "-XX:G1LogRSRegionEntries=2", so that 1 and 5 end up in same | |
1394 // hash bucket. | |
1395 HeapRegion* hr0 = g1h->region_at(0); | |
1396 HeapRegion* hr1 = g1h->region_at(1); | |
1397 HeapRegion* hr2 = g1h->region_at(5); | |
1398 HeapRegion* hr3 = g1h->region_at(6); | |
1399 HeapRegion* hr4 = g1h->region_at(7); | |
1400 HeapRegion* hr5 = g1h->region_at(8); | |
1401 | |
1402 HeapWord* hr1_start = hr1->bottom(); | |
1403 HeapWord* hr1_mid = hr1_start + HeapRegion::GrainWords/2; | |
1404 HeapWord* hr1_last = hr1->end() - 1; | |
1405 | |
1406 HeapWord* hr2_start = hr2->bottom(); | |
1407 HeapWord* hr2_mid = hr2_start + HeapRegion::GrainWords/2; | |
1408 HeapWord* hr2_last = hr2->end() - 1; | |
1409 | |
1410 HeapWord* hr3_start = hr3->bottom(); | |
1411 HeapWord* hr3_mid = hr3_start + HeapRegion::GrainWords/2; | |
1412 HeapWord* hr3_last = hr3->end() - 1; | |
1413 | |
1414 HeapRegionRemSet* hrrs = hr0->rem_set(); | |
1415 | |
1416 // Make three references from region 0x101... | |
1417 hrrs->add_reference((oop*)hr1_start); | |
1418 hrrs->add_reference((oop*)hr1_mid); | |
1419 hrrs->add_reference((oop*)hr1_last); | |
1420 | |
1421 hrrs->add_reference((oop*)hr2_start); | |
1422 hrrs->add_reference((oop*)hr2_mid); | |
1423 hrrs->add_reference((oop*)hr2_last); | |
1424 | |
1425 hrrs->add_reference((oop*)hr3_start); | |
1426 hrrs->add_reference((oop*)hr3_mid); | |
1427 hrrs->add_reference((oop*)hr3_last); | |
1428 | |
1429 // Now cause a coarsening. | |
1430 hrrs->add_reference((oop*)hr4->bottom()); | |
1431 hrrs->add_reference((oop*)hr5->bottom()); | |
1432 | |
1433 // Now, does iteration yield these three? | |
1434 HeapRegionRemSetIterator iter; | |
1435 hrrs->init_iterator(&iter); | |
1436 size_t sum = 0; | |
1437 size_t card_index; | |
1438 while (iter.has_next(card_index)) { | |
1439 HeapWord* card_start = | |
1440 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
1441 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); | |
1442 sum++; | |
1443 } | |
1444 guarantee(sum == 11 - 3 + 2048, "Failure"); | |
1445 guarantee(sum == hrrs->occupied(), "Failure"); | |
1446 } | |
1447 #endif |