Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp @ 1763:d6f45b55c972
4809552: Optimize Arrays.fill(...)
Reviewed-by: kvn
author | never |
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date | Fri, 27 Aug 2010 17:33:49 -0700 |
parents | c18cbe5936b8 |
children | 9f4848ebbabd |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2009, 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 | |
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 protected: | |
61 // We need access in order to union things into the base table. | |
62 BitMap* bm() { return &_bm; } | |
63 | |
545 | 64 #if PRT_COUNT_OCCUPIED |
342 | 65 void recount_occupied() { |
66 _occupied = (jint) bm()->count_one_bits(); | |
67 } | |
545 | 68 #endif |
342 | 69 |
70 PerRegionTable(HeapRegion* hr) : | |
71 _hr(hr), | |
72 #if PRT_COUNT_OCCUPIED | |
73 _occupied(0), | |
74 #endif | |
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75 _bm(HeapRegion::CardsPerRegion, false /* in-resource-area */) |
342 | 76 {} |
77 | |
78 static void free(PerRegionTable* prt) { | |
79 while (true) { | |
80 PerRegionTable* fl = _free_list; | |
81 prt->set_next_free(fl); | |
82 PerRegionTable* res = | |
83 (PerRegionTable*) | |
84 Atomic::cmpxchg_ptr(prt, &_free_list, fl); | |
85 if (res == fl) return; | |
86 } | |
87 ShouldNotReachHere(); | |
88 } | |
89 | |
90 static PerRegionTable* alloc(HeapRegion* hr) { | |
91 PerRegionTable* fl = _free_list; | |
92 while (fl != NULL) { | |
93 PerRegionTable* nxt = fl->next_free(); | |
94 PerRegionTable* res = | |
95 (PerRegionTable*) | |
96 Atomic::cmpxchg_ptr(nxt, &_free_list, fl); | |
97 if (res == fl) { | |
98 fl->init(hr); | |
99 return fl; | |
100 } else { | |
101 fl = _free_list; | |
102 } | |
103 } | |
104 assert(fl == NULL, "Loop condition."); | |
105 return new PerRegionTable(hr); | |
106 } | |
107 | |
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108 void add_card_work(CardIdx_t from_card, bool par) { |
342 | 109 if (!_bm.at(from_card)) { |
110 if (par) { | |
111 if (_bm.par_at_put(from_card, 1)) { | |
112 #if PRT_COUNT_OCCUPIED | |
113 Atomic::inc(&_occupied); | |
114 #endif | |
115 } | |
116 } else { | |
117 _bm.at_put(from_card, 1); | |
118 #if PRT_COUNT_OCCUPIED | |
119 _occupied++; | |
120 #endif | |
121 } | |
122 } | |
123 } | |
124 | |
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125 void add_reference_work(OopOrNarrowOopStar from, bool par) { |
342 | 126 // Must make this robust in case "from" is not in "_hr", because of |
127 // concurrency. | |
128 | |
129 #if HRRS_VERBOSE | |
130 gclog_or_tty->print_cr(" PRT::Add_reference_work(" PTR_FORMAT "->" PTR_FORMAT").", | |
131 from, *from); | |
132 #endif | |
133 | |
134 HeapRegion* loc_hr = hr(); | |
135 // If the test below fails, then this table was reused concurrently | |
136 // with this operation. This is OK, since the old table was coarsened, | |
137 // and adding a bit to the new table is never incorrect. | |
138 if (loc_hr->is_in_reserved(from)) { | |
139 size_t hw_offset = pointer_delta((HeapWord*)from, loc_hr->bottom()); | |
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140 CardIdx_t from_card = (CardIdx_t) |
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141 hw_offset >> (CardTableModRefBS::card_shift - LogHeapWordSize); |
342 | 142 |
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143 assert(0 <= from_card && from_card < HeapRegion::CardsPerRegion, |
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144 "Must be in range."); |
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145 add_card_work(from_card, par); |
342 | 146 } |
147 } | |
148 | |
149 public: | |
150 | |
151 HeapRegion* hr() const { return _hr; } | |
152 | |
153 #if PRT_COUNT_OCCUPIED | |
154 jint occupied() const { | |
155 // Overkill, but if we ever need it... | |
156 // guarantee(_occupied == _bm.count_one_bits(), "Check"); | |
157 return _occupied; | |
158 } | |
159 #else | |
160 jint occupied() const { | |
161 return _bm.count_one_bits(); | |
162 } | |
163 #endif | |
164 | |
165 void init(HeapRegion* hr) { | |
166 _hr = hr; | |
167 #if PRT_COUNT_OCCUPIED | |
168 _occupied = 0; | |
169 #endif | |
170 _bm.clear(); | |
171 } | |
172 | |
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173 void add_reference(OopOrNarrowOopStar from) { |
342 | 174 add_reference_work(from, /*parallel*/ true); |
175 } | |
176 | |
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177 void seq_add_reference(OopOrNarrowOopStar from) { |
342 | 178 add_reference_work(from, /*parallel*/ false); |
179 } | |
180 | |
181 void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { | |
182 HeapWord* hr_bot = hr()->bottom(); | |
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183 size_t hr_first_card_index = ctbs->index_for(hr_bot); |
342 | 184 bm()->set_intersection_at_offset(*card_bm, hr_first_card_index); |
185 #if PRT_COUNT_OCCUPIED | |
186 recount_occupied(); | |
187 #endif | |
188 } | |
189 | |
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190 void add_card(CardIdx_t from_card_index) { |
342 | 191 add_card_work(from_card_index, /*parallel*/ true); |
192 } | |
193 | |
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194 void seq_add_card(CardIdx_t from_card_index) { |
342 | 195 add_card_work(from_card_index, /*parallel*/ false); |
196 } | |
197 | |
198 // (Destructively) union the bitmap of the current table into the given | |
199 // bitmap (which is assumed to be of the same size.) | |
200 void union_bitmap_into(BitMap* bm) { | |
201 bm->set_union(_bm); | |
202 } | |
203 | |
204 // Mem size in bytes. | |
205 size_t mem_size() const { | |
206 return sizeof(this) + _bm.size_in_words() * HeapWordSize; | |
207 } | |
208 | |
209 static size_t fl_mem_size() { | |
210 PerRegionTable* cur = _free_list; | |
211 size_t res = 0; | |
212 while (cur != NULL) { | |
213 res += sizeof(PerRegionTable); | |
214 cur = cur->next_free(); | |
215 } | |
216 return res; | |
217 } | |
218 | |
219 // Requires "from" to be in "hr()". | |
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220 bool contains_reference(OopOrNarrowOopStar from) const { |
342 | 221 assert(hr()->is_in_reserved(from), "Precondition."); |
222 size_t card_ind = pointer_delta(from, hr()->bottom(), | |
223 CardTableModRefBS::card_size); | |
224 return _bm.at(card_ind); | |
225 } | |
226 }; | |
227 | |
228 PerRegionTable* PerRegionTable::_free_list = NULL; | |
229 | |
230 | |
231 #define COUNT_PAR_EXPANDS 0 | |
232 | |
233 #if COUNT_PAR_EXPANDS | |
234 static jint n_par_expands = 0; | |
235 static jint n_par_contracts = 0; | |
236 static jint par_expand_list_len = 0; | |
237 static jint max_par_expand_list_len = 0; | |
238 | |
239 static void print_par_expand() { | |
240 Atomic::inc(&n_par_expands); | |
241 Atomic::inc(&par_expand_list_len); | |
242 if (par_expand_list_len > max_par_expand_list_len) { | |
243 max_par_expand_list_len = par_expand_list_len; | |
244 } | |
245 if ((n_par_expands % 10) == 0) { | |
246 gclog_or_tty->print_cr("\n\n%d par expands: %d contracts, " | |
247 "len = %d, max_len = %d\n.", | |
248 n_par_expands, n_par_contracts, par_expand_list_len, | |
249 max_par_expand_list_len); | |
250 } | |
251 } | |
252 #endif | |
253 | |
254 class PosParPRT: public PerRegionTable { | |
255 PerRegionTable** _par_tables; | |
256 | |
257 enum SomePrivateConstants { | |
258 ReserveParTableExpansion = 1 | |
259 }; | |
260 | |
261 void par_contract() { | |
262 assert(_par_tables != NULL, "Precondition."); | |
263 int n = HeapRegionRemSet::num_par_rem_sets()-1; | |
264 for (int i = 0; i < n; i++) { | |
265 _par_tables[i]->union_bitmap_into(bm()); | |
266 PerRegionTable::free(_par_tables[i]); | |
267 _par_tables[i] = NULL; | |
268 } | |
269 #if PRT_COUNT_OCCUPIED | |
270 // We must recount the "occupied." | |
271 recount_occupied(); | |
272 #endif | |
273 FREE_C_HEAP_ARRAY(PerRegionTable*, _par_tables); | |
274 _par_tables = NULL; | |
275 #if COUNT_PAR_EXPANDS | |
276 Atomic::inc(&n_par_contracts); | |
277 Atomic::dec(&par_expand_list_len); | |
278 #endif | |
279 } | |
280 | |
281 static PerRegionTable** _par_table_fl; | |
282 | |
283 PosParPRT* _next; | |
284 | |
285 static PosParPRT* _free_list; | |
286 | |
287 PerRegionTable** par_tables() const { | |
288 assert(uintptr_t(NULL) == 0, "Assumption."); | |
289 if (uintptr_t(_par_tables) <= ReserveParTableExpansion) | |
290 return NULL; | |
291 else | |
292 return _par_tables; | |
293 } | |
294 | |
295 PosParPRT* _next_par_expanded; | |
296 PosParPRT* next_par_expanded() { return _next_par_expanded; } | |
297 void set_next_par_expanded(PosParPRT* ppprt) { _next_par_expanded = ppprt; } | |
298 static PosParPRT* _par_expanded_list; | |
299 | |
300 public: | |
301 | |
302 PosParPRT(HeapRegion* hr) : PerRegionTable(hr), _par_tables(NULL) {} | |
303 | |
304 jint occupied() const { | |
305 jint res = PerRegionTable::occupied(); | |
306 if (par_tables() != NULL) { | |
307 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { | |
308 res += par_tables()[i]->occupied(); | |
309 } | |
310 } | |
311 return res; | |
312 } | |
313 | |
314 void init(HeapRegion* hr) { | |
315 PerRegionTable::init(hr); | |
316 _next = NULL; | |
317 if (par_tables() != NULL) { | |
318 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { | |
319 par_tables()[i]->init(hr); | |
320 } | |
321 } | |
322 } | |
323 | |
324 static void free(PosParPRT* prt) { | |
325 while (true) { | |
326 PosParPRT* fl = _free_list; | |
327 prt->set_next(fl); | |
328 PosParPRT* res = | |
329 (PosParPRT*) | |
330 Atomic::cmpxchg_ptr(prt, &_free_list, fl); | |
331 if (res == fl) return; | |
332 } | |
333 ShouldNotReachHere(); | |
334 } | |
335 | |
336 static PosParPRT* alloc(HeapRegion* hr) { | |
337 PosParPRT* fl = _free_list; | |
338 while (fl != NULL) { | |
339 PosParPRT* nxt = fl->next(); | |
340 PosParPRT* res = | |
341 (PosParPRT*) | |
342 Atomic::cmpxchg_ptr(nxt, &_free_list, fl); | |
343 if (res == fl) { | |
344 fl->init(hr); | |
345 return fl; | |
346 } else { | |
347 fl = _free_list; | |
348 } | |
349 } | |
350 assert(fl == NULL, "Loop condition."); | |
351 return new PosParPRT(hr); | |
352 } | |
353 | |
354 PosParPRT* next() const { return _next; } | |
355 void set_next(PosParPRT* nxt) { _next = nxt; } | |
356 PosParPRT** next_addr() { return &_next; } | |
357 | |
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358 bool should_expand(int tid) { |
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359 return par_tables() == NULL && tid > 0 && hr()->is_gc_alloc_region(); |
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360 } |
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361 |
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362 void par_expand() { |
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363 int n = HeapRegionRemSet::num_par_rem_sets()-1; |
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364 if (n <= 0) return; |
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365 if (_par_tables == NULL) { |
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366 PerRegionTable* res = |
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367 (PerRegionTable*) |
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368 Atomic::cmpxchg_ptr((PerRegionTable*)ReserveParTableExpansion, |
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369 &_par_tables, NULL); |
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370 if (res != NULL) return; |
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371 // Otherwise, we reserved the right to do the expansion. |
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372 |
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373 PerRegionTable** ptables = NEW_C_HEAP_ARRAY(PerRegionTable*, n); |
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374 for (int i = 0; i < n; i++) { |
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375 PerRegionTable* ptable = PerRegionTable::alloc(hr()); |
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376 ptables[i] = ptable; |
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377 } |
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378 // Here we do not need an atomic. |
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379 _par_tables = ptables; |
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380 #if COUNT_PAR_EXPANDS |
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381 print_par_expand(); |
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382 #endif |
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383 // We must put this table on the expanded list. |
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384 PosParPRT* exp_head = _par_expanded_list; |
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385 while (true) { |
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386 set_next_par_expanded(exp_head); |
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387 PosParPRT* res = |
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388 (PosParPRT*) |
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389 Atomic::cmpxchg_ptr(this, &_par_expanded_list, exp_head); |
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390 if (res == exp_head) return; |
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391 // Otherwise. |
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392 exp_head = res; |
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393 } |
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394 ShouldNotReachHere(); |
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395 } |
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396 } |
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397 |
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398 void add_reference(OopOrNarrowOopStar from, int tid) { |
342 | 399 // Expand if necessary. |
400 PerRegionTable** pt = par_tables(); | |
401 if (pt != NULL) { | |
402 // We always have to assume that mods to table 0 are in parallel, | |
403 // because of the claiming scheme in parallel expansion. A thread | |
404 // with tid != 0 that finds the table to be NULL, but doesn't succeed | |
405 // in claiming the right of expanding it, will end up in the else | |
406 // clause of the above if test. That thread could be delayed, and a | |
407 // thread 0 add reference could see the table expanded, and come | |
408 // here. Both threads would be adding in parallel. But we get to | |
409 // not use atomics for tids > 0. | |
410 if (tid == 0) { | |
411 PerRegionTable::add_reference(from); | |
412 } else { | |
413 pt[tid-1]->seq_add_reference(from); | |
414 } | |
415 } else { | |
416 // Not expanded -- add to the base table. | |
417 PerRegionTable::add_reference(from); | |
418 } | |
419 } | |
420 | |
421 void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { | |
422 assert(_par_tables == NULL, "Precondition"); | |
423 PerRegionTable::scrub(ctbs, card_bm); | |
424 } | |
425 | |
426 size_t mem_size() const { | |
427 size_t res = | |
428 PerRegionTable::mem_size() + sizeof(this) - sizeof(PerRegionTable); | |
429 if (_par_tables != NULL) { | |
430 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { | |
431 res += _par_tables[i]->mem_size(); | |
432 } | |
433 } | |
434 return res; | |
435 } | |
436 | |
437 static size_t fl_mem_size() { | |
438 PosParPRT* cur = _free_list; | |
439 size_t res = 0; | |
440 while (cur != NULL) { | |
441 res += sizeof(PosParPRT); | |
442 cur = cur->next(); | |
443 } | |
444 return res; | |
445 } | |
446 | |
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447 bool contains_reference(OopOrNarrowOopStar from) const { |
342 | 448 if (PerRegionTable::contains_reference(from)) return true; |
449 if (_par_tables != NULL) { | |
450 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { | |
451 if (_par_tables[i]->contains_reference(from)) return true; | |
452 } | |
453 } | |
454 return false; | |
455 } | |
456 | |
457 static void par_contract_all(); | |
458 | |
459 }; | |
460 | |
461 void PosParPRT::par_contract_all() { | |
462 PosParPRT* hd = _par_expanded_list; | |
463 while (hd != NULL) { | |
464 PosParPRT* nxt = hd->next_par_expanded(); | |
465 PosParPRT* res = | |
466 (PosParPRT*) | |
467 Atomic::cmpxchg_ptr(nxt, &_par_expanded_list, hd); | |
468 if (res == hd) { | |
469 // We claimed the right to contract this table. | |
470 hd->set_next_par_expanded(NULL); | |
471 hd->par_contract(); | |
472 hd = _par_expanded_list; | |
473 } else { | |
474 hd = res; | |
475 } | |
476 } | |
477 } | |
478 | |
479 PosParPRT* PosParPRT::_free_list = NULL; | |
480 PosParPRT* PosParPRT::_par_expanded_list = NULL; | |
481 | |
482 jint OtherRegionsTable::_cache_probes = 0; | |
483 jint OtherRegionsTable::_cache_hits = 0; | |
484 | |
485 size_t OtherRegionsTable::_max_fine_entries = 0; | |
486 size_t OtherRegionsTable::_mod_max_fine_entries_mask = 0; | |
487 #if SAMPLE_FOR_EVICTION | |
488 size_t OtherRegionsTable::_fine_eviction_stride = 0; | |
489 size_t OtherRegionsTable::_fine_eviction_sample_size = 0; | |
490 #endif | |
491 | |
492 OtherRegionsTable::OtherRegionsTable(HeapRegion* hr) : | |
493 _g1h(G1CollectedHeap::heap()), | |
494 _m(Mutex::leaf, "An OtherRegionsTable lock", true), | |
495 _hr(hr), | |
496 _coarse_map(G1CollectedHeap::heap()->max_regions(), | |
497 false /* in-resource-area */), | |
498 _fine_grain_regions(NULL), | |
499 _n_fine_entries(0), _n_coarse_entries(0), | |
500 #if SAMPLE_FOR_EVICTION | |
501 _fine_eviction_start(0), | |
502 #endif | |
503 _sparse_table(hr) | |
504 { | |
505 typedef PosParPRT* PosParPRTPtr; | |
506 if (_max_fine_entries == 0) { | |
507 assert(_mod_max_fine_entries_mask == 0, "Both or none."); | |
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508 size_t max_entries_log = (size_t)log2_long((jlong)G1RSetRegionEntries); |
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509 _max_fine_entries = (size_t)(1 << max_entries_log); |
342 | 510 _mod_max_fine_entries_mask = _max_fine_entries - 1; |
511 #if SAMPLE_FOR_EVICTION | |
512 assert(_fine_eviction_sample_size == 0 | |
513 && _fine_eviction_stride == 0, "All init at same time."); | |
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514 _fine_eviction_sample_size = MAX2((size_t)4, max_entries_log); |
342 | 515 _fine_eviction_stride = _max_fine_entries / _fine_eviction_sample_size; |
516 #endif | |
517 } | |
518 _fine_grain_regions = new PosParPRTPtr[_max_fine_entries]; | |
519 if (_fine_grain_regions == NULL) | |
520 vm_exit_out_of_memory(sizeof(void*)*_max_fine_entries, | |
521 "Failed to allocate _fine_grain_entries."); | |
522 for (size_t i = 0; i < _max_fine_entries; i++) { | |
523 _fine_grain_regions[i] = NULL; | |
524 } | |
525 } | |
526 | |
527 int** OtherRegionsTable::_from_card_cache = NULL; | |
528 size_t OtherRegionsTable::_from_card_cache_max_regions = 0; | |
529 size_t OtherRegionsTable::_from_card_cache_mem_size = 0; | |
530 | |
531 void OtherRegionsTable::init_from_card_cache(size_t max_regions) { | |
532 _from_card_cache_max_regions = max_regions; | |
533 | |
534 int n_par_rs = HeapRegionRemSet::num_par_rem_sets(); | |
535 _from_card_cache = NEW_C_HEAP_ARRAY(int*, n_par_rs); | |
536 for (int i = 0; i < n_par_rs; i++) { | |
537 _from_card_cache[i] = NEW_C_HEAP_ARRAY(int, max_regions); | |
538 for (size_t j = 0; j < max_regions; j++) { | |
539 _from_card_cache[i][j] = -1; // An invalid value. | |
540 } | |
541 } | |
542 _from_card_cache_mem_size = n_par_rs * max_regions * sizeof(int); | |
543 } | |
544 | |
545 void OtherRegionsTable::shrink_from_card_cache(size_t new_n_regs) { | |
546 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
547 assert(new_n_regs <= _from_card_cache_max_regions, "Must be within max."); | |
548 for (size_t j = new_n_regs; j < _from_card_cache_max_regions; j++) { | |
549 _from_card_cache[i][j] = -1; // An invalid value. | |
550 } | |
551 } | |
552 } | |
553 | |
554 #ifndef PRODUCT | |
555 void OtherRegionsTable::print_from_card_cache() { | |
556 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
557 for (size_t j = 0; j < _from_card_cache_max_regions; j++) { | |
558 gclog_or_tty->print_cr("_from_card_cache[%d][%d] = %d.", | |
559 i, j, _from_card_cache[i][j]); | |
560 } | |
561 } | |
562 } | |
563 #endif | |
564 | |
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565 void OtherRegionsTable::add_reference(OopOrNarrowOopStar from, int tid) { |
342 | 566 size_t cur_hrs_ind = hr()->hrs_index(); |
567 | |
568 #if HRRS_VERBOSE | |
569 gclog_or_tty->print_cr("ORT::add_reference_work(" PTR_FORMAT "->" PTR_FORMAT ").", | |
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570 from, |
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571 UseCompressedOops |
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572 ? oopDesc::load_decode_heap_oop((narrowOop*)from) |
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573 : oopDesc::load_decode_heap_oop((oop*)from)); |
342 | 574 #endif |
575 | |
576 int from_card = (int)(uintptr_t(from) >> CardTableModRefBS::card_shift); | |
577 | |
578 #if HRRS_VERBOSE | |
579 gclog_or_tty->print_cr("Table for [" PTR_FORMAT "...): card %d (cache = %d)", | |
580 hr()->bottom(), from_card, | |
581 _from_card_cache[tid][cur_hrs_ind]); | |
582 #endif | |
583 | |
584 #define COUNT_CACHE 0 | |
585 #if COUNT_CACHE | |
586 jint p = Atomic::add(1, &_cache_probes); | |
587 if ((p % 10000) == 0) { | |
588 jint hits = _cache_hits; | |
589 gclog_or_tty->print_cr("%d/%d = %5.2f%% RS cache hits.", | |
590 _cache_hits, p, 100.0* (float)hits/(float)p); | |
591 } | |
592 #endif | |
593 if (from_card == _from_card_cache[tid][cur_hrs_ind]) { | |
594 #if HRRS_VERBOSE | |
595 gclog_or_tty->print_cr(" from-card cache hit."); | |
596 #endif | |
597 #if COUNT_CACHE | |
598 Atomic::inc(&_cache_hits); | |
599 #endif | |
600 assert(contains_reference(from), "We just added it!"); | |
601 return; | |
602 } else { | |
603 _from_card_cache[tid][cur_hrs_ind] = from_card; | |
604 } | |
605 | |
606 // Note that this may be a continued H region. | |
607 HeapRegion* from_hr = _g1h->heap_region_containing_raw(from); | |
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608 RegionIdx_t from_hrs_ind = (RegionIdx_t) from_hr->hrs_index(); |
342 | 609 |
610 // If the region is already coarsened, return. | |
611 if (_coarse_map.at(from_hrs_ind)) { | |
612 #if HRRS_VERBOSE | |
613 gclog_or_tty->print_cr(" coarse map hit."); | |
614 #endif | |
615 assert(contains_reference(from), "We just added it!"); | |
616 return; | |
617 } | |
618 | |
619 // Otherwise find a per-region table to add it to. | |
620 size_t ind = from_hrs_ind & _mod_max_fine_entries_mask; | |
621 PosParPRT* prt = find_region_table(ind, from_hr); | |
622 if (prt == NULL) { | |
623 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
624 // Confirm that it's really not there... | |
625 prt = find_region_table(ind, from_hr); | |
626 if (prt == NULL) { | |
627 | |
628 uintptr_t from_hr_bot_card_index = | |
629 uintptr_t(from_hr->bottom()) | |
630 >> CardTableModRefBS::card_shift; | |
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631 CardIdx_t card_index = from_card - from_hr_bot_card_index; |
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632 assert(0 <= card_index && card_index < HeapRegion::CardsPerRegion, |
342 | 633 "Must be in range."); |
634 if (G1HRRSUseSparseTable && | |
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635 _sparse_table.add_card(from_hrs_ind, card_index)) { |
342 | 636 if (G1RecordHRRSOops) { |
637 HeapRegionRemSet::record(hr(), from); | |
638 #if HRRS_VERBOSE | |
639 gclog_or_tty->print(" Added card " PTR_FORMAT " to region " | |
640 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", | |
641 align_size_down(uintptr_t(from), | |
642 CardTableModRefBS::card_size), | |
643 hr()->bottom(), from); | |
644 #endif | |
645 } | |
646 #if HRRS_VERBOSE | |
647 gclog_or_tty->print_cr(" added card to sparse table."); | |
648 #endif | |
649 assert(contains_reference_locked(from), "We just added it!"); | |
650 return; | |
651 } else { | |
652 #if HRRS_VERBOSE | |
653 gclog_or_tty->print_cr(" [tid %d] sparse table entry " | |
654 "overflow(f: %d, t: %d)", | |
655 tid, from_hrs_ind, cur_hrs_ind); | |
656 #endif | |
657 } | |
658 | |
659 if (_n_fine_entries == _max_fine_entries) { | |
660 prt = delete_region_table(); | |
661 } else { | |
662 prt = PosParPRT::alloc(from_hr); | |
663 } | |
664 prt->init(from_hr); | |
665 | |
666 PosParPRT* first_prt = _fine_grain_regions[ind]; | |
667 prt->set_next(first_prt); // XXX Maybe move to init? | |
668 _fine_grain_regions[ind] = prt; | |
669 _n_fine_entries++; | |
670 | |
671 if (G1HRRSUseSparseTable) { | |
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672 // Transfer from sparse to fine-grain. |
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673 SparsePRTEntry *sprt_entry = _sparse_table.get_entry(from_hrs_ind); |
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674 assert(sprt_entry != NULL, "There should have been an entry"); |
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675 for (int i = 0; i < SparsePRTEntry::cards_num(); i++) { |
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676 CardIdx_t c = sprt_entry->card(i); |
342 | 677 if (c != SparsePRTEntry::NullEntry) { |
678 prt->add_card(c); | |
679 } | |
680 } | |
681 // Now we can delete the sparse entry. | |
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682 bool res = _sparse_table.delete_entry(from_hrs_ind); |
342 | 683 assert(res, "It should have been there."); |
684 } | |
685 } | |
686 assert(prt != NULL && prt->hr() == from_hr, "consequence"); | |
687 } | |
688 // Note that we can't assert "prt->hr() == from_hr", because of the | |
689 // possibility of concurrent reuse. But see head comment of | |
690 // OtherRegionsTable for why this is OK. | |
691 assert(prt != NULL, "Inv"); | |
692 | |
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693 if (prt->should_expand(tid)) { |
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694 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); |
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695 HeapRegion* prt_hr = prt->hr(); |
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696 if (prt_hr == from_hr) { |
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697 // Make sure the table still corresponds to the same region |
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698 prt->par_expand(); |
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699 prt->add_reference(from, tid); |
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700 } |
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701 // else: The table has been concurrently coarsened, evicted, and |
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702 // the table data structure re-used for another table. So, we |
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703 // don't need to add the reference any more given that the table |
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704 // has been coarsened and the whole region will be scanned anyway. |
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705 } else { |
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706 prt->add_reference(from, tid); |
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707 } |
342 | 708 if (G1RecordHRRSOops) { |
709 HeapRegionRemSet::record(hr(), from); | |
710 #if HRRS_VERBOSE | |
711 gclog_or_tty->print("Added card " PTR_FORMAT " to region " | |
712 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", | |
713 align_size_down(uintptr_t(from), | |
714 CardTableModRefBS::card_size), | |
715 hr()->bottom(), from); | |
716 #endif | |
717 } | |
718 assert(contains_reference(from), "We just added it!"); | |
719 } | |
720 | |
721 PosParPRT* | |
722 OtherRegionsTable::find_region_table(size_t ind, HeapRegion* hr) const { | |
723 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
724 PosParPRT* prt = _fine_grain_regions[ind]; | |
725 while (prt != NULL && prt->hr() != hr) { | |
726 prt = prt->next(); | |
727 } | |
728 // Loop postcondition is the method postcondition. | |
729 return prt; | |
730 } | |
731 | |
732 | |
733 #define DRT_CENSUS 0 | |
734 | |
735 #if DRT_CENSUS | |
736 static const int HistoSize = 6; | |
737 static int global_histo[HistoSize] = { 0, 0, 0, 0, 0, 0 }; | |
738 static int coarsenings = 0; | |
739 static int occ_sum = 0; | |
740 #endif | |
741 | |
742 jint OtherRegionsTable::_n_coarsenings = 0; | |
743 | |
744 PosParPRT* OtherRegionsTable::delete_region_table() { | |
745 #if DRT_CENSUS | |
746 int histo[HistoSize] = { 0, 0, 0, 0, 0, 0 }; | |
747 const int histo_limits[] = { 1, 4, 16, 64, 256, 2048 }; | |
748 #endif | |
749 | |
750 assert(_m.owned_by_self(), "Precondition"); | |
751 assert(_n_fine_entries == _max_fine_entries, "Precondition"); | |
752 PosParPRT* max = NULL; | |
753 jint max_occ = 0; | |
754 PosParPRT** max_prev; | |
755 size_t max_ind; | |
756 | |
757 #if SAMPLE_FOR_EVICTION | |
758 size_t i = _fine_eviction_start; | |
759 for (size_t k = 0; k < _fine_eviction_sample_size; k++) { | |
760 size_t ii = i; | |
761 // Make sure we get a non-NULL sample. | |
762 while (_fine_grain_regions[ii] == NULL) { | |
763 ii++; | |
764 if (ii == _max_fine_entries) ii = 0; | |
765 guarantee(ii != i, "We must find one."); | |
766 } | |
767 PosParPRT** prev = &_fine_grain_regions[ii]; | |
768 PosParPRT* cur = *prev; | |
769 while (cur != NULL) { | |
770 jint cur_occ = cur->occupied(); | |
771 if (max == NULL || cur_occ > max_occ) { | |
772 max = cur; | |
773 max_prev = prev; | |
774 max_ind = i; | |
775 max_occ = cur_occ; | |
776 } | |
777 prev = cur->next_addr(); | |
778 cur = cur->next(); | |
779 } | |
780 i = i + _fine_eviction_stride; | |
781 if (i >= _n_fine_entries) i = i - _n_fine_entries; | |
782 } | |
783 _fine_eviction_start++; | |
784 if (_fine_eviction_start >= _n_fine_entries) | |
785 _fine_eviction_start -= _n_fine_entries; | |
786 #else | |
787 for (int i = 0; i < _max_fine_entries; i++) { | |
788 PosParPRT** prev = &_fine_grain_regions[i]; | |
789 PosParPRT* cur = *prev; | |
790 while (cur != NULL) { | |
791 jint cur_occ = cur->occupied(); | |
792 #if DRT_CENSUS | |
793 for (int k = 0; k < HistoSize; k++) { | |
794 if (cur_occ <= histo_limits[k]) { | |
795 histo[k]++; global_histo[k]++; break; | |
796 } | |
797 } | |
798 #endif | |
799 if (max == NULL || cur_occ > max_occ) { | |
800 max = cur; | |
801 max_prev = prev; | |
802 max_ind = i; | |
803 max_occ = cur_occ; | |
804 } | |
805 prev = cur->next_addr(); | |
806 cur = cur->next(); | |
807 } | |
808 } | |
809 #endif | |
810 // XXX | |
811 guarantee(max != NULL, "Since _n_fine_entries > 0"); | |
812 #if DRT_CENSUS | |
813 gclog_or_tty->print_cr("In a coarsening: histo of occs:"); | |
814 for (int k = 0; k < HistoSize; k++) { | |
815 gclog_or_tty->print_cr(" <= %4d: %5d.", histo_limits[k], histo[k]); | |
816 } | |
817 coarsenings++; | |
818 occ_sum += max_occ; | |
819 if ((coarsenings % 100) == 0) { | |
820 gclog_or_tty->print_cr("\ncoarsenings = %d; global summary:", coarsenings); | |
821 for (int k = 0; k < HistoSize; k++) { | |
822 gclog_or_tty->print_cr(" <= %4d: %5d.", histo_limits[k], global_histo[k]); | |
823 } | |
824 gclog_or_tty->print_cr("Avg occ of deleted region = %6.2f.", | |
825 (float)occ_sum/(float)coarsenings); | |
826 } | |
827 #endif | |
828 | |
829 // Set the corresponding coarse bit. | |
830 int max_hrs_index = max->hr()->hrs_index(); | |
831 if (!_coarse_map.at(max_hrs_index)) { | |
832 _coarse_map.at_put(max_hrs_index, true); | |
833 _n_coarse_entries++; | |
834 #if 0 | |
835 gclog_or_tty->print("Coarsened entry in region [" PTR_FORMAT "...] " | |
836 "for region [" PTR_FORMAT "...] (%d coarse entries).\n", | |
837 hr()->bottom(), | |
838 max->hr()->bottom(), | |
839 _n_coarse_entries); | |
840 #endif | |
841 } | |
842 | |
843 // Unsplice. | |
844 *max_prev = max->next(); | |
845 Atomic::inc(&_n_coarsenings); | |
846 _n_fine_entries--; | |
847 return max; | |
848 } | |
849 | |
850 | |
851 // At present, this must be called stop-world single-threaded. | |
852 void OtherRegionsTable::scrub(CardTableModRefBS* ctbs, | |
853 BitMap* region_bm, BitMap* card_bm) { | |
854 // First eliminated garbage regions from the coarse map. | |
855 if (G1RSScrubVerbose) | |
856 gclog_or_tty->print_cr("Scrubbing region %d:", hr()->hrs_index()); | |
857 | |
858 assert(_coarse_map.size() == region_bm->size(), "Precondition"); | |
859 if (G1RSScrubVerbose) | |
860 gclog_or_tty->print(" Coarse map: before = %d...", _n_coarse_entries); | |
861 _coarse_map.set_intersection(*region_bm); | |
862 _n_coarse_entries = _coarse_map.count_one_bits(); | |
863 if (G1RSScrubVerbose) | |
864 gclog_or_tty->print_cr(" after = %d.", _n_coarse_entries); | |
865 | |
866 // Now do the fine-grained maps. | |
867 for (size_t i = 0; i < _max_fine_entries; i++) { | |
868 PosParPRT* cur = _fine_grain_regions[i]; | |
869 PosParPRT** prev = &_fine_grain_regions[i]; | |
870 while (cur != NULL) { | |
871 PosParPRT* nxt = cur->next(); | |
872 // If the entire region is dead, eliminate. | |
873 if (G1RSScrubVerbose) | |
874 gclog_or_tty->print_cr(" For other region %d:", cur->hr()->hrs_index()); | |
875 if (!region_bm->at(cur->hr()->hrs_index())) { | |
876 *prev = nxt; | |
877 cur->set_next(NULL); | |
878 _n_fine_entries--; | |
879 if (G1RSScrubVerbose) | |
880 gclog_or_tty->print_cr(" deleted via region map."); | |
881 PosParPRT::free(cur); | |
882 } else { | |
883 // Do fine-grain elimination. | |
884 if (G1RSScrubVerbose) | |
885 gclog_or_tty->print(" occ: before = %4d.", cur->occupied()); | |
886 cur->scrub(ctbs, card_bm); | |
887 if (G1RSScrubVerbose) | |
888 gclog_or_tty->print_cr(" after = %4d.", cur->occupied()); | |
889 // Did that empty the table completely? | |
890 if (cur->occupied() == 0) { | |
891 *prev = nxt; | |
892 cur->set_next(NULL); | |
893 _n_fine_entries--; | |
894 PosParPRT::free(cur); | |
895 } else { | |
896 prev = cur->next_addr(); | |
897 } | |
898 } | |
899 cur = nxt; | |
900 } | |
901 } | |
902 // Since we may have deleted a from_card_cache entry from the RS, clear | |
903 // the FCC. | |
904 clear_fcc(); | |
905 } | |
906 | |
907 | |
908 size_t OtherRegionsTable::occupied() const { | |
909 // Cast away const in this case. | |
910 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
911 size_t sum = occ_fine(); | |
912 sum += occ_sparse(); | |
913 sum += occ_coarse(); | |
914 return sum; | |
915 } | |
916 | |
917 size_t OtherRegionsTable::occ_fine() const { | |
918 size_t sum = 0; | |
919 for (size_t i = 0; i < _max_fine_entries; i++) { | |
920 PosParPRT* cur = _fine_grain_regions[i]; | |
921 while (cur != NULL) { | |
922 sum += cur->occupied(); | |
923 cur = cur->next(); | |
924 } | |
925 } | |
926 return sum; | |
927 } | |
928 | |
929 size_t OtherRegionsTable::occ_coarse() const { | |
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930 return (_n_coarse_entries * HeapRegion::CardsPerRegion); |
342 | 931 } |
932 | |
933 size_t OtherRegionsTable::occ_sparse() const { | |
934 return _sparse_table.occupied(); | |
935 } | |
936 | |
937 size_t OtherRegionsTable::mem_size() const { | |
938 // Cast away const in this case. | |
939 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
940 size_t sum = 0; | |
941 for (size_t i = 0; i < _max_fine_entries; i++) { | |
942 PosParPRT* cur = _fine_grain_regions[i]; | |
943 while (cur != NULL) { | |
944 sum += cur->mem_size(); | |
945 cur = cur->next(); | |
946 } | |
947 } | |
948 sum += (sizeof(PosParPRT*) * _max_fine_entries); | |
949 sum += (_coarse_map.size_in_words() * HeapWordSize); | |
950 sum += (_sparse_table.mem_size()); | |
951 sum += sizeof(*this) - sizeof(_sparse_table); // Avoid double counting above. | |
952 return sum; | |
953 } | |
954 | |
955 size_t OtherRegionsTable::static_mem_size() { | |
956 return _from_card_cache_mem_size; | |
957 } | |
958 | |
959 size_t OtherRegionsTable::fl_mem_size() { | |
960 return PerRegionTable::fl_mem_size() + PosParPRT::fl_mem_size(); | |
961 } | |
962 | |
963 void OtherRegionsTable::clear_fcc() { | |
964 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
965 _from_card_cache[i][hr()->hrs_index()] = -1; | |
966 } | |
967 } | |
968 | |
969 void OtherRegionsTable::clear() { | |
970 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
971 for (size_t i = 0; i < _max_fine_entries; i++) { | |
972 PosParPRT* cur = _fine_grain_regions[i]; | |
973 while (cur != NULL) { | |
974 PosParPRT* nxt = cur->next(); | |
975 PosParPRT::free(cur); | |
976 cur = nxt; | |
977 } | |
978 _fine_grain_regions[i] = NULL; | |
979 } | |
980 _sparse_table.clear(); | |
981 _coarse_map.clear(); | |
982 _n_fine_entries = 0; | |
983 _n_coarse_entries = 0; | |
984 | |
985 clear_fcc(); | |
986 } | |
987 | |
988 void OtherRegionsTable::clear_incoming_entry(HeapRegion* from_hr) { | |
989 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
990 size_t hrs_ind = (size_t)from_hr->hrs_index(); | |
991 size_t ind = hrs_ind & _mod_max_fine_entries_mask; | |
992 if (del_single_region_table(ind, from_hr)) { | |
993 assert(!_coarse_map.at(hrs_ind), "Inv"); | |
994 } else { | |
995 _coarse_map.par_at_put(hrs_ind, 0); | |
996 } | |
997 // Check to see if any of the fcc entries come from here. | |
998 int hr_ind = hr()->hrs_index(); | |
999 for (int tid = 0; tid < HeapRegionRemSet::num_par_rem_sets(); tid++) { | |
1000 int fcc_ent = _from_card_cache[tid][hr_ind]; | |
1001 if (fcc_ent != -1) { | |
1002 HeapWord* card_addr = (HeapWord*) | |
1003 (uintptr_t(fcc_ent) << CardTableModRefBS::card_shift); | |
1004 if (hr()->is_in_reserved(card_addr)) { | |
1005 // Clear the from card cache. | |
1006 _from_card_cache[tid][hr_ind] = -1; | |
1007 } | |
1008 } | |
1009 } | |
1010 } | |
1011 | |
1012 bool OtherRegionsTable::del_single_region_table(size_t ind, | |
1013 HeapRegion* hr) { | |
1014 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
1015 PosParPRT** prev_addr = &_fine_grain_regions[ind]; | |
1016 PosParPRT* prt = *prev_addr; | |
1017 while (prt != NULL && prt->hr() != hr) { | |
1018 prev_addr = prt->next_addr(); | |
1019 prt = prt->next(); | |
1020 } | |
1021 if (prt != NULL) { | |
1022 assert(prt->hr() == hr, "Loop postcondition."); | |
1023 *prev_addr = prt->next(); | |
1024 PosParPRT::free(prt); | |
1025 _n_fine_entries--; | |
1026 return true; | |
1027 } else { | |
1028 return false; | |
1029 } | |
1030 } | |
1031 | |
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1032 bool OtherRegionsTable::contains_reference(OopOrNarrowOopStar from) const { |
342 | 1033 // Cast away const in this case. |
1034 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
1035 return contains_reference_locked(from); | |
1036 } | |
1037 | |
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1038 bool OtherRegionsTable::contains_reference_locked(OopOrNarrowOopStar from) const { |
342 | 1039 HeapRegion* hr = _g1h->heap_region_containing_raw(from); |
1040 if (hr == NULL) return false; | |
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1041 RegionIdx_t hr_ind = (RegionIdx_t) hr->hrs_index(); |
342 | 1042 // Is this region in the coarse map? |
1043 if (_coarse_map.at(hr_ind)) return true; | |
1044 | |
1045 PosParPRT* prt = find_region_table(hr_ind & _mod_max_fine_entries_mask, | |
1046 hr); | |
1047 if (prt != NULL) { | |
1048 return prt->contains_reference(from); | |
1049 | |
1050 } else { | |
1051 uintptr_t from_card = | |
1052 (uintptr_t(from) >> CardTableModRefBS::card_shift); | |
1053 uintptr_t hr_bot_card_index = | |
1054 uintptr_t(hr->bottom()) >> CardTableModRefBS::card_shift; | |
1055 assert(from_card >= hr_bot_card_index, "Inv"); | |
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1056 CardIdx_t card_index = from_card - hr_bot_card_index; |
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1057 assert(0 <= card_index && card_index < HeapRegion::CardsPerRegion, |
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1058 "Must be in range."); |
807
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1059 return _sparse_table.contains_card(hr_ind, card_index); |
342 | 1060 } |
1061 | |
1062 | |
1063 } | |
1064 | |
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1065 // Determines how many threads can add records to an rset in parallel. |
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1066 // This can be done by either mutator threads together with the |
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1067 // concurrent refinement threads or GC threads. |
342 | 1068 int HeapRegionRemSet::num_par_rem_sets() { |
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1069 return (int)MAX2(DirtyCardQueueSet::num_par_ids() + ConcurrentG1Refine::thread_num(), ParallelGCThreads); |
342 | 1070 } |
1071 | |
1072 HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, | |
1073 HeapRegion* hr) | |
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1074 : _bosa(bosa), _other_regions(hr), _iter_state(Unclaimed) { } |
342 | 1075 |
1076 | |
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1077 void HeapRegionRemSet::setup_remset_size() { |
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1078 // Setup sparse and fine-grain tables sizes. |
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1079 // table_size = base * (log(region_size / 1M) + 1) |
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1080 int region_size_log_mb = MAX2((int)HeapRegion::LogOfHRGrainBytes - (int)LOG_M, 0); |
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1081 if (FLAG_IS_DEFAULT(G1RSetSparseRegionEntries)) { |
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1082 G1RSetSparseRegionEntries = G1RSetSparseRegionEntriesBase * (region_size_log_mb + 1); |
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1083 } |
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1084 if (FLAG_IS_DEFAULT(G1RSetRegionEntries)) { |
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1085 G1RSetRegionEntries = G1RSetRegionEntriesBase * (region_size_log_mb + 1); |
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1086 } |
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1087 guarantee(G1RSetSparseRegionEntries > 0 && G1RSetRegionEntries > 0 , "Sanity"); |
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1088 } |
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1089 |
342 | 1090 void HeapRegionRemSet::init_for_par_iteration() { |
1091 _iter_state = Unclaimed; | |
1092 } | |
1093 | |
1094 bool HeapRegionRemSet::claim_iter() { | |
1095 if (_iter_state != Unclaimed) return false; | |
1096 jint res = Atomic::cmpxchg(Claimed, (jint*)(&_iter_state), Unclaimed); | |
1097 return (res == Unclaimed); | |
1098 } | |
1099 | |
1100 void HeapRegionRemSet::set_iter_complete() { | |
1101 _iter_state = Complete; | |
1102 } | |
1103 | |
1104 bool HeapRegionRemSet::iter_is_complete() { | |
1105 return _iter_state == Complete; | |
1106 } | |
1107 | |
1108 | |
1109 void HeapRegionRemSet::init_iterator(HeapRegionRemSetIterator* iter) const { | |
1110 iter->initialize(this); | |
1111 } | |
1112 | |
1113 #ifndef PRODUCT | |
1114 void HeapRegionRemSet::print() const { | |
1115 HeapRegionRemSetIterator iter; | |
1116 init_iterator(&iter); | |
1117 size_t card_index; | |
1118 while (iter.has_next(card_index)) { | |
1119 HeapWord* card_start = | |
1120 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
1121 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); | |
1122 } | |
1123 // XXX | |
1124 if (iter.n_yielded() != occupied()) { | |
1125 gclog_or_tty->print_cr("Yielded disagrees with occupied:"); | |
1126 gclog_or_tty->print_cr(" %6d yielded (%6d coarse, %6d fine).", | |
1127 iter.n_yielded(), | |
1128 iter.n_yielded_coarse(), iter.n_yielded_fine()); | |
1129 gclog_or_tty->print_cr(" %6d occ (%6d coarse, %6d fine).", | |
1130 occupied(), occ_coarse(), occ_fine()); | |
1131 } | |
1132 guarantee(iter.n_yielded() == occupied(), | |
1133 "We should have yielded all the represented cards."); | |
1134 } | |
1135 #endif | |
1136 | |
1137 void HeapRegionRemSet::cleanup() { | |
1138 SparsePRT::cleanup_all(); | |
1139 } | |
1140 | |
1141 void HeapRegionRemSet::par_cleanup() { | |
1142 PosParPRT::par_contract_all(); | |
1143 } | |
1144 | |
1145 void HeapRegionRemSet::clear() { | |
1146 _other_regions.clear(); | |
1147 assert(occupied() == 0, "Should be clear."); | |
1148 } | |
1149 | |
1150 void HeapRegionRemSet::scrub(CardTableModRefBS* ctbs, | |
1151 BitMap* region_bm, BitMap* card_bm) { | |
1152 _other_regions.scrub(ctbs, region_bm, card_bm); | |
1153 } | |
1154 | |
1155 //-------------------- Iteration -------------------- | |
1156 | |
1157 HeapRegionRemSetIterator:: | |
1158 HeapRegionRemSetIterator() : | |
1159 _hrrs(NULL), | |
1160 _g1h(G1CollectedHeap::heap()), | |
1161 _bosa(NULL), | |
1162 _sparse_iter(size_t(G1CollectedHeap::heap()->reserved_region().start()) | |
1163 >> CardTableModRefBS::card_shift) | |
1164 {} | |
1165 | |
1166 void HeapRegionRemSetIterator::initialize(const HeapRegionRemSet* hrrs) { | |
1167 _hrrs = hrrs; | |
1168 _coarse_map = &_hrrs->_other_regions._coarse_map; | |
1169 _fine_grain_regions = _hrrs->_other_regions._fine_grain_regions; | |
1170 _bosa = _hrrs->bosa(); | |
1171 | |
1172 _is = Sparse; | |
1173 // Set these values so that we increment to the first region. | |
1174 _coarse_cur_region_index = -1; | |
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1175 _coarse_cur_region_cur_card = (HeapRegion::CardsPerRegion-1);; |
342 | 1176 |
1177 _cur_region_cur_card = 0; | |
1178 | |
1179 _fine_array_index = -1; | |
1180 _fine_cur_prt = NULL; | |
1181 | |
1182 _n_yielded_coarse = 0; | |
1183 _n_yielded_fine = 0; | |
1184 _n_yielded_sparse = 0; | |
1185 | |
1186 _sparse_iter.init(&hrrs->_other_regions._sparse_table); | |
1187 } | |
1188 | |
1189 bool HeapRegionRemSetIterator::coarse_has_next(size_t& card_index) { | |
1190 if (_hrrs->_other_regions._n_coarse_entries == 0) return false; | |
1191 // Go to the next card. | |
1192 _coarse_cur_region_cur_card++; | |
1193 // Was the last the last card in the current region? | |
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1194 if (_coarse_cur_region_cur_card == HeapRegion::CardsPerRegion) { |
342 | 1195 // Yes: find the next region. This may leave _coarse_cur_region_index |
1196 // Set to the last index, in which case there are no more coarse | |
1197 // regions. | |
1198 _coarse_cur_region_index = | |
1199 (int) _coarse_map->get_next_one_offset(_coarse_cur_region_index + 1); | |
1200 if ((size_t)_coarse_cur_region_index < _coarse_map->size()) { | |
1201 _coarse_cur_region_cur_card = 0; | |
1202 HeapWord* r_bot = | |
1203 _g1h->region_at(_coarse_cur_region_index)->bottom(); | |
1204 _cur_region_card_offset = _bosa->index_for(r_bot); | |
1205 } else { | |
1206 return false; | |
1207 } | |
1208 } | |
1209 // If we didn't return false above, then we can yield a card. | |
1210 card_index = _cur_region_card_offset + _coarse_cur_region_cur_card; | |
1211 return true; | |
1212 } | |
1213 | |
1214 void HeapRegionRemSetIterator::fine_find_next_non_null_prt() { | |
1215 // Otherwise, find the next bucket list in the array. | |
1216 _fine_array_index++; | |
1217 while (_fine_array_index < (int) OtherRegionsTable::_max_fine_entries) { | |
1218 _fine_cur_prt = _fine_grain_regions[_fine_array_index]; | |
1219 if (_fine_cur_prt != NULL) return; | |
1220 else _fine_array_index++; | |
1221 } | |
1222 assert(_fine_cur_prt == NULL, "Loop post"); | |
1223 } | |
1224 | |
1225 bool HeapRegionRemSetIterator::fine_has_next(size_t& card_index) { | |
1226 if (fine_has_next()) { | |
1227 _cur_region_cur_card = | |
1228 _fine_cur_prt->_bm.get_next_one_offset(_cur_region_cur_card + 1); | |
1229 } | |
1230 while (!fine_has_next()) { | |
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1231 if (_cur_region_cur_card == (size_t) HeapRegion::CardsPerRegion) { |
342 | 1232 _cur_region_cur_card = 0; |
1233 _fine_cur_prt = _fine_cur_prt->next(); | |
1234 } | |
1235 if (_fine_cur_prt == NULL) { | |
1236 fine_find_next_non_null_prt(); | |
1237 if (_fine_cur_prt == NULL) return false; | |
1238 } | |
1239 assert(_fine_cur_prt != NULL && _cur_region_cur_card == 0, | |
1240 "inv."); | |
1241 HeapWord* r_bot = | |
1242 _fine_cur_prt->hr()->bottom(); | |
1243 _cur_region_card_offset = _bosa->index_for(r_bot); | |
1244 _cur_region_cur_card = _fine_cur_prt->_bm.get_next_one_offset(0); | |
1245 } | |
1246 assert(fine_has_next(), "Or else we exited the loop via the return."); | |
1247 card_index = _cur_region_card_offset + _cur_region_cur_card; | |
1248 return true; | |
1249 } | |
1250 | |
1251 bool HeapRegionRemSetIterator::fine_has_next() { | |
1252 return | |
1253 _fine_cur_prt != NULL && | |
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1254 _cur_region_cur_card < (size_t) HeapRegion::CardsPerRegion; |
342 | 1255 } |
1256 | |
1257 bool HeapRegionRemSetIterator::has_next(size_t& card_index) { | |
1258 switch (_is) { | |
1259 case Sparse: | |
1260 if (_sparse_iter.has_next(card_index)) { | |
1261 _n_yielded_sparse++; | |
1262 return true; | |
1263 } | |
1264 // Otherwise, deliberate fall-through | |
1265 _is = Fine; | |
1266 case Fine: | |
1267 if (fine_has_next(card_index)) { | |
1268 _n_yielded_fine++; | |
1269 return true; | |
1270 } | |
1271 // Otherwise, deliberate fall-through | |
1272 _is = Coarse; | |
1273 case Coarse: | |
1274 if (coarse_has_next(card_index)) { | |
1275 _n_yielded_coarse++; | |
1276 return true; | |
1277 } | |
1278 // Otherwise... | |
1279 break; | |
1280 } | |
1281 assert(ParallelGCThreads > 1 || | |
1282 n_yielded() == _hrrs->occupied(), | |
1283 "Should have yielded all the cards in the rem set " | |
1284 "(in the non-par case)."); | |
1285 return false; | |
1286 } | |
1287 | |
1288 | |
1289 | |
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1290 OopOrNarrowOopStar* HeapRegionRemSet::_recorded_oops = NULL; |
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1291 HeapWord** HeapRegionRemSet::_recorded_cards = NULL; |
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1292 HeapRegion** HeapRegionRemSet::_recorded_regions = NULL; |
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1293 int HeapRegionRemSet::_n_recorded = 0; |
342 | 1294 |
1295 HeapRegionRemSet::Event* HeapRegionRemSet::_recorded_events = NULL; | |
1296 int* HeapRegionRemSet::_recorded_event_index = NULL; | |
1297 int HeapRegionRemSet::_n_recorded_events = 0; | |
1298 | |
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1299 void HeapRegionRemSet::record(HeapRegion* hr, OopOrNarrowOopStar f) { |
342 | 1300 if (_recorded_oops == NULL) { |
1301 assert(_n_recorded == 0 | |
1302 && _recorded_cards == NULL | |
1303 && _recorded_regions == NULL, | |
1304 "Inv"); | |
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1305 _recorded_oops = NEW_C_HEAP_ARRAY(OopOrNarrowOopStar, MaxRecorded); |
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1306 _recorded_cards = NEW_C_HEAP_ARRAY(HeapWord*, MaxRecorded); |
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1307 _recorded_regions = NEW_C_HEAP_ARRAY(HeapRegion*, MaxRecorded); |
342 | 1308 } |
1309 if (_n_recorded == MaxRecorded) { | |
1310 gclog_or_tty->print_cr("Filled up 'recorded' (%d).", MaxRecorded); | |
1311 } else { | |
1312 _recorded_cards[_n_recorded] = | |
1313 (HeapWord*)align_size_down(uintptr_t(f), | |
1314 CardTableModRefBS::card_size); | |
1315 _recorded_oops[_n_recorded] = f; | |
1316 _recorded_regions[_n_recorded] = hr; | |
1317 _n_recorded++; | |
1318 } | |
1319 } | |
1320 | |
1321 void HeapRegionRemSet::record_event(Event evnt) { | |
1322 if (!G1RecordHRRSEvents) return; | |
1323 | |
1324 if (_recorded_events == NULL) { | |
1325 assert(_n_recorded_events == 0 | |
1326 && _recorded_event_index == NULL, | |
1327 "Inv"); | |
1328 _recorded_events = NEW_C_HEAP_ARRAY(Event, MaxRecordedEvents); | |
1329 _recorded_event_index = NEW_C_HEAP_ARRAY(int, MaxRecordedEvents); | |
1330 } | |
1331 if (_n_recorded_events == MaxRecordedEvents) { | |
1332 gclog_or_tty->print_cr("Filled up 'recorded_events' (%d).", MaxRecordedEvents); | |
1333 } else { | |
1334 _recorded_events[_n_recorded_events] = evnt; | |
1335 _recorded_event_index[_n_recorded_events] = _n_recorded; | |
1336 _n_recorded_events++; | |
1337 } | |
1338 } | |
1339 | |
1340 void HeapRegionRemSet::print_event(outputStream* str, Event evnt) { | |
1341 switch (evnt) { | |
1342 case Event_EvacStart: | |
1343 str->print("Evac Start"); | |
1344 break; | |
1345 case Event_EvacEnd: | |
1346 str->print("Evac End"); | |
1347 break; | |
1348 case Event_RSUpdateEnd: | |
1349 str->print("RS Update End"); | |
1350 break; | |
1351 } | |
1352 } | |
1353 | |
1354 void HeapRegionRemSet::print_recorded() { | |
1355 int cur_evnt = 0; | |
1356 Event cur_evnt_kind; | |
1357 int cur_evnt_ind = 0; | |
1358 if (_n_recorded_events > 0) { | |
1359 cur_evnt_kind = _recorded_events[cur_evnt]; | |
1360 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
1361 } | |
1362 | |
1363 for (int i = 0; i < _n_recorded; i++) { | |
1364 while (cur_evnt < _n_recorded_events && i == cur_evnt_ind) { | |
1365 gclog_or_tty->print("Event: "); | |
1366 print_event(gclog_or_tty, cur_evnt_kind); | |
1367 gclog_or_tty->print_cr(""); | |
1368 cur_evnt++; | |
1369 if (cur_evnt < MaxRecordedEvents) { | |
1370 cur_evnt_kind = _recorded_events[cur_evnt]; | |
1371 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
1372 } | |
1373 } | |
1374 gclog_or_tty->print("Added card " PTR_FORMAT " to region [" PTR_FORMAT "...]" | |
1375 " for ref " PTR_FORMAT ".\n", | |
1376 _recorded_cards[i], _recorded_regions[i]->bottom(), | |
1377 _recorded_oops[i]); | |
1378 } | |
1379 } | |
1380 | |
1381 #ifndef PRODUCT | |
1382 void HeapRegionRemSet::test() { | |
1383 os::sleep(Thread::current(), (jlong)5000, false); | |
1384 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1385 | |
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1386 // Run with "-XX:G1LogRSetRegionEntries=2", so that 1 and 5 end up in same |
342 | 1387 // hash bucket. |
1388 HeapRegion* hr0 = g1h->region_at(0); | |
1389 HeapRegion* hr1 = g1h->region_at(1); | |
1390 HeapRegion* hr2 = g1h->region_at(5); | |
1391 HeapRegion* hr3 = g1h->region_at(6); | |
1392 HeapRegion* hr4 = g1h->region_at(7); | |
1393 HeapRegion* hr5 = g1h->region_at(8); | |
1394 | |
1395 HeapWord* hr1_start = hr1->bottom(); | |
1396 HeapWord* hr1_mid = hr1_start + HeapRegion::GrainWords/2; | |
1397 HeapWord* hr1_last = hr1->end() - 1; | |
1398 | |
1399 HeapWord* hr2_start = hr2->bottom(); | |
1400 HeapWord* hr2_mid = hr2_start + HeapRegion::GrainWords/2; | |
1401 HeapWord* hr2_last = hr2->end() - 1; | |
1402 | |
1403 HeapWord* hr3_start = hr3->bottom(); | |
1404 HeapWord* hr3_mid = hr3_start + HeapRegion::GrainWords/2; | |
1405 HeapWord* hr3_last = hr3->end() - 1; | |
1406 | |
1407 HeapRegionRemSet* hrrs = hr0->rem_set(); | |
1408 | |
1409 // Make three references from region 0x101... | |
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1410 hrrs->add_reference((OopOrNarrowOopStar)hr1_start); |
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1411 hrrs->add_reference((OopOrNarrowOopStar)hr1_mid); |
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1412 hrrs->add_reference((OopOrNarrowOopStar)hr1_last); |
342 | 1413 |
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1414 hrrs->add_reference((OopOrNarrowOopStar)hr2_start); |
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1415 hrrs->add_reference((OopOrNarrowOopStar)hr2_mid); |
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1416 hrrs->add_reference((OopOrNarrowOopStar)hr2_last); |
342 | 1417 |
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1418 hrrs->add_reference((OopOrNarrowOopStar)hr3_start); |
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1419 hrrs->add_reference((OopOrNarrowOopStar)hr3_mid); |
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1420 hrrs->add_reference((OopOrNarrowOopStar)hr3_last); |
342 | 1421 |
1422 // Now cause a coarsening. | |
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1423 hrrs->add_reference((OopOrNarrowOopStar)hr4->bottom()); |
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1424 hrrs->add_reference((OopOrNarrowOopStar)hr5->bottom()); |
342 | 1425 |
1426 // Now, does iteration yield these three? | |
1427 HeapRegionRemSetIterator iter; | |
1428 hrrs->init_iterator(&iter); | |
1429 size_t sum = 0; | |
1430 size_t card_index; | |
1431 while (iter.has_next(card_index)) { | |
1432 HeapWord* card_start = | |
1433 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
1434 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); | |
1435 sum++; | |
1436 } | |
1437 guarantee(sum == 11 - 3 + 2048, "Failure"); | |
1438 guarantee(sum == hrrs->occupied(), "Failure"); | |
1439 } | |
1440 #endif |