Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp @ 5935:a735aec54ea4
7123170: JCK vm/jvmti/ResourceExhausted/resexh001/resexh00101/ tests fails since 7u4 b02
Summary: The JVMTI ResourceExhausted events must be generated in all places where OOME is thrown
Reviewed-by: acorn, coleenp, dcubed, dholmes, dsamersoff, jwilhelm, tonyp
Contributed-by: serguei.spitsyn@oracle.com
author | sspitsyn |
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date | Wed, 14 Mar 2012 20:06:48 -0700 |
parents | 5e5d4821bf07 |
children | 720b6a76dd9d |
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342 | 1 /* |
2173 | 2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
27 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" | |
28 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
29 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
30 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
31 #include "memory/allocation.hpp" | |
32 #include "memory/space.inline.hpp" | |
33 #include "utilities/bitMap.inline.hpp" | |
34 #include "utilities/globalDefinitions.hpp" | |
342 | 35 |
36 #define HRRS_VERBOSE 0 | |
37 | |
38 #define PRT_COUNT_OCCUPIED 1 | |
39 | |
40 // OtherRegionsTable | |
41 | |
42 class PerRegionTable: public CHeapObj { | |
43 friend class OtherRegionsTable; | |
44 friend class HeapRegionRemSetIterator; | |
45 | |
46 HeapRegion* _hr; | |
47 BitMap _bm; | |
48 #if PRT_COUNT_OCCUPIED | |
49 jint _occupied; | |
50 #endif | |
51 PerRegionTable* _next_free; | |
52 | |
53 PerRegionTable* next_free() { return _next_free; } | |
54 void set_next_free(PerRegionTable* prt) { _next_free = prt; } | |
55 | |
56 | |
57 static PerRegionTable* _free_list; | |
58 | |
59 #ifdef _MSC_VER | |
60 // For some reason even though the classes are marked as friend they are unable | |
61 // to access CardsPerRegion when private/protected. Only the windows c++ compiler | |
62 // says this Sun CC and linux gcc don't have a problem with access when private | |
63 | |
64 public: | |
65 | |
66 #endif // _MSC_VER | |
67 | |
68 protected: | |
69 // We need access in order to union things into the base table. | |
70 BitMap* bm() { return &_bm; } | |
71 | |
545 | 72 #if PRT_COUNT_OCCUPIED |
342 | 73 void recount_occupied() { |
74 _occupied = (jint) bm()->count_one_bits(); | |
75 } | |
545 | 76 #endif |
342 | 77 |
78 PerRegionTable(HeapRegion* hr) : | |
79 _hr(hr), | |
80 #if PRT_COUNT_OCCUPIED | |
81 _occupied(0), | |
82 #endif | |
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83 _bm(HeapRegion::CardsPerRegion, false /* in-resource-area */) |
342 | 84 {} |
85 | |
86 static void free(PerRegionTable* prt) { | |
87 while (true) { | |
88 PerRegionTable* fl = _free_list; | |
89 prt->set_next_free(fl); | |
90 PerRegionTable* res = | |
91 (PerRegionTable*) | |
92 Atomic::cmpxchg_ptr(prt, &_free_list, fl); | |
93 if (res == fl) return; | |
94 } | |
95 ShouldNotReachHere(); | |
96 } | |
97 | |
98 static PerRegionTable* alloc(HeapRegion* hr) { | |
99 PerRegionTable* fl = _free_list; | |
100 while (fl != NULL) { | |
101 PerRegionTable* nxt = fl->next_free(); | |
102 PerRegionTable* res = | |
103 (PerRegionTable*) | |
104 Atomic::cmpxchg_ptr(nxt, &_free_list, fl); | |
105 if (res == fl) { | |
106 fl->init(hr); | |
107 return fl; | |
108 } else { | |
109 fl = _free_list; | |
110 } | |
111 } | |
112 assert(fl == NULL, "Loop condition."); | |
113 return new PerRegionTable(hr); | |
114 } | |
115 | |
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116 void add_card_work(CardIdx_t from_card, bool par) { |
342 | 117 if (!_bm.at(from_card)) { |
118 if (par) { | |
119 if (_bm.par_at_put(from_card, 1)) { | |
120 #if PRT_COUNT_OCCUPIED | |
121 Atomic::inc(&_occupied); | |
122 #endif | |
123 } | |
124 } else { | |
125 _bm.at_put(from_card, 1); | |
126 #if PRT_COUNT_OCCUPIED | |
127 _occupied++; | |
128 #endif | |
129 } | |
130 } | |
131 } | |
132 | |
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133 void add_reference_work(OopOrNarrowOopStar from, bool par) { |
342 | 134 // Must make this robust in case "from" is not in "_hr", because of |
135 // concurrency. | |
136 | |
137 #if HRRS_VERBOSE | |
138 gclog_or_tty->print_cr(" PRT::Add_reference_work(" PTR_FORMAT "->" PTR_FORMAT").", | |
139 from, *from); | |
140 #endif | |
141 | |
142 HeapRegion* loc_hr = hr(); | |
143 // If the test below fails, then this table was reused concurrently | |
144 // with this operation. This is OK, since the old table was coarsened, | |
145 // and adding a bit to the new table is never incorrect. | |
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146 // If the table used to belong to a continues humongous region and is |
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147 // now reused for the corresponding start humongous region, we need to |
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148 // make sure that we detect this. Thus, we call is_in_reserved_raw() |
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149 // instead of just is_in_reserved() here. |
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150 if (loc_hr->is_in_reserved_raw(from)) { |
342 | 151 size_t hw_offset = pointer_delta((HeapWord*)from, loc_hr->bottom()); |
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152 CardIdx_t from_card = (CardIdx_t) |
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153 hw_offset >> (CardTableModRefBS::card_shift - LogHeapWordSize); |
342 | 154 |
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155 assert(0 <= from_card && (size_t)from_card < HeapRegion::CardsPerRegion, |
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156 "Must be in range."); |
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157 add_card_work(from_card, par); |
342 | 158 } |
159 } | |
160 | |
161 public: | |
162 | |
163 HeapRegion* hr() const { return _hr; } | |
164 | |
165 #if PRT_COUNT_OCCUPIED | |
166 jint occupied() const { | |
167 // Overkill, but if we ever need it... | |
168 // guarantee(_occupied == _bm.count_one_bits(), "Check"); | |
169 return _occupied; | |
170 } | |
171 #else | |
172 jint occupied() const { | |
173 return _bm.count_one_bits(); | |
174 } | |
175 #endif | |
176 | |
177 void init(HeapRegion* hr) { | |
178 _hr = hr; | |
179 #if PRT_COUNT_OCCUPIED | |
180 _occupied = 0; | |
181 #endif | |
182 _bm.clear(); | |
183 } | |
184 | |
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185 void add_reference(OopOrNarrowOopStar from) { |
342 | 186 add_reference_work(from, /*parallel*/ true); |
187 } | |
188 | |
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189 void seq_add_reference(OopOrNarrowOopStar from) { |
342 | 190 add_reference_work(from, /*parallel*/ false); |
191 } | |
192 | |
193 void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { | |
194 HeapWord* hr_bot = hr()->bottom(); | |
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195 size_t hr_first_card_index = ctbs->index_for(hr_bot); |
342 | 196 bm()->set_intersection_at_offset(*card_bm, hr_first_card_index); |
197 #if PRT_COUNT_OCCUPIED | |
198 recount_occupied(); | |
199 #endif | |
200 } | |
201 | |
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202 void add_card(CardIdx_t from_card_index) { |
342 | 203 add_card_work(from_card_index, /*parallel*/ true); |
204 } | |
205 | |
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206 void seq_add_card(CardIdx_t from_card_index) { |
342 | 207 add_card_work(from_card_index, /*parallel*/ false); |
208 } | |
209 | |
210 // (Destructively) union the bitmap of the current table into the given | |
211 // bitmap (which is assumed to be of the same size.) | |
212 void union_bitmap_into(BitMap* bm) { | |
213 bm->set_union(_bm); | |
214 } | |
215 | |
216 // Mem size in bytes. | |
217 size_t mem_size() const { | |
218 return sizeof(this) + _bm.size_in_words() * HeapWordSize; | |
219 } | |
220 | |
221 static size_t fl_mem_size() { | |
222 PerRegionTable* cur = _free_list; | |
223 size_t res = 0; | |
224 while (cur != NULL) { | |
225 res += sizeof(PerRegionTable); | |
226 cur = cur->next_free(); | |
227 } | |
228 return res; | |
229 } | |
230 | |
231 // Requires "from" to be in "hr()". | |
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232 bool contains_reference(OopOrNarrowOopStar from) const { |
342 | 233 assert(hr()->is_in_reserved(from), "Precondition."); |
234 size_t card_ind = pointer_delta(from, hr()->bottom(), | |
235 CardTableModRefBS::card_size); | |
236 return _bm.at(card_ind); | |
237 } | |
238 }; | |
239 | |
240 PerRegionTable* PerRegionTable::_free_list = NULL; | |
241 | |
242 | |
243 #define COUNT_PAR_EXPANDS 0 | |
244 | |
245 #if COUNT_PAR_EXPANDS | |
246 static jint n_par_expands = 0; | |
247 static jint n_par_contracts = 0; | |
248 static jint par_expand_list_len = 0; | |
249 static jint max_par_expand_list_len = 0; | |
250 | |
251 static void print_par_expand() { | |
252 Atomic::inc(&n_par_expands); | |
253 Atomic::inc(&par_expand_list_len); | |
254 if (par_expand_list_len > max_par_expand_list_len) { | |
255 max_par_expand_list_len = par_expand_list_len; | |
256 } | |
257 if ((n_par_expands % 10) == 0) { | |
258 gclog_or_tty->print_cr("\n\n%d par expands: %d contracts, " | |
259 "len = %d, max_len = %d\n.", | |
260 n_par_expands, n_par_contracts, par_expand_list_len, | |
261 max_par_expand_list_len); | |
262 } | |
263 } | |
264 #endif | |
265 | |
266 class PosParPRT: public PerRegionTable { | |
267 PerRegionTable** _par_tables; | |
268 | |
269 enum SomePrivateConstants { | |
270 ReserveParTableExpansion = 1 | |
271 }; | |
272 | |
273 void par_contract() { | |
274 assert(_par_tables != NULL, "Precondition."); | |
275 int n = HeapRegionRemSet::num_par_rem_sets()-1; | |
276 for (int i = 0; i < n; i++) { | |
277 _par_tables[i]->union_bitmap_into(bm()); | |
278 PerRegionTable::free(_par_tables[i]); | |
279 _par_tables[i] = NULL; | |
280 } | |
281 #if PRT_COUNT_OCCUPIED | |
282 // We must recount the "occupied." | |
283 recount_occupied(); | |
284 #endif | |
285 FREE_C_HEAP_ARRAY(PerRegionTable*, _par_tables); | |
286 _par_tables = NULL; | |
287 #if COUNT_PAR_EXPANDS | |
288 Atomic::inc(&n_par_contracts); | |
289 Atomic::dec(&par_expand_list_len); | |
290 #endif | |
291 } | |
292 | |
293 static PerRegionTable** _par_table_fl; | |
294 | |
295 PosParPRT* _next; | |
296 | |
297 static PosParPRT* _free_list; | |
298 | |
299 PerRegionTable** par_tables() const { | |
300 assert(uintptr_t(NULL) == 0, "Assumption."); | |
301 if (uintptr_t(_par_tables) <= ReserveParTableExpansion) | |
302 return NULL; | |
303 else | |
304 return _par_tables; | |
305 } | |
306 | |
307 PosParPRT* _next_par_expanded; | |
308 PosParPRT* next_par_expanded() { return _next_par_expanded; } | |
309 void set_next_par_expanded(PosParPRT* ppprt) { _next_par_expanded = ppprt; } | |
310 static PosParPRT* _par_expanded_list; | |
311 | |
312 public: | |
313 | |
314 PosParPRT(HeapRegion* hr) : PerRegionTable(hr), _par_tables(NULL) {} | |
315 | |
316 jint occupied() const { | |
317 jint res = PerRegionTable::occupied(); | |
318 if (par_tables() != NULL) { | |
319 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { | |
320 res += par_tables()[i]->occupied(); | |
321 } | |
322 } | |
323 return res; | |
324 } | |
325 | |
326 void init(HeapRegion* hr) { | |
327 PerRegionTable::init(hr); | |
328 _next = NULL; | |
329 if (par_tables() != NULL) { | |
330 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { | |
331 par_tables()[i]->init(hr); | |
332 } | |
333 } | |
334 } | |
335 | |
336 static void free(PosParPRT* prt) { | |
337 while (true) { | |
338 PosParPRT* fl = _free_list; | |
339 prt->set_next(fl); | |
340 PosParPRT* res = | |
341 (PosParPRT*) | |
342 Atomic::cmpxchg_ptr(prt, &_free_list, fl); | |
343 if (res == fl) return; | |
344 } | |
345 ShouldNotReachHere(); | |
346 } | |
347 | |
348 static PosParPRT* alloc(HeapRegion* hr) { | |
349 PosParPRT* fl = _free_list; | |
350 while (fl != NULL) { | |
351 PosParPRT* nxt = fl->next(); | |
352 PosParPRT* res = | |
353 (PosParPRT*) | |
354 Atomic::cmpxchg_ptr(nxt, &_free_list, fl); | |
355 if (res == fl) { | |
356 fl->init(hr); | |
357 return fl; | |
358 } else { | |
359 fl = _free_list; | |
360 } | |
361 } | |
362 assert(fl == NULL, "Loop condition."); | |
363 return new PosParPRT(hr); | |
364 } | |
365 | |
366 PosParPRT* next() const { return _next; } | |
367 void set_next(PosParPRT* nxt) { _next = nxt; } | |
368 PosParPRT** next_addr() { return &_next; } | |
369 | |
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370 bool should_expand(int tid) { |
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371 // Given that we now defer RSet updates for after a GC we don't |
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372 // really need to expand the tables any more. This code should be |
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373 // cleaned up in the future (see CR 6921087). |
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374 return false; |
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375 } |
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376 |
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377 void par_expand() { |
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378 int n = HeapRegionRemSet::num_par_rem_sets()-1; |
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379 if (n <= 0) return; |
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380 if (_par_tables == NULL) { |
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381 PerRegionTable* res = |
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382 (PerRegionTable*) |
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383 Atomic::cmpxchg_ptr((PerRegionTable*)ReserveParTableExpansion, |
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384 &_par_tables, NULL); |
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385 if (res != NULL) return; |
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386 // Otherwise, we reserved the right to do the expansion. |
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387 |
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388 PerRegionTable** ptables = NEW_C_HEAP_ARRAY(PerRegionTable*, n); |
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389 for (int i = 0; i < n; i++) { |
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390 PerRegionTable* ptable = PerRegionTable::alloc(hr()); |
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391 ptables[i] = ptable; |
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392 } |
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393 // Here we do not need an atomic. |
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394 _par_tables = ptables; |
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395 #if COUNT_PAR_EXPANDS |
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396 print_par_expand(); |
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397 #endif |
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398 // We must put this table on the expanded list. |
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399 PosParPRT* exp_head = _par_expanded_list; |
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400 while (true) { |
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401 set_next_par_expanded(exp_head); |
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402 PosParPRT* res = |
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403 (PosParPRT*) |
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404 Atomic::cmpxchg_ptr(this, &_par_expanded_list, exp_head); |
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405 if (res == exp_head) return; |
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406 // Otherwise. |
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407 exp_head = res; |
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408 } |
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409 ShouldNotReachHere(); |
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410 } |
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411 } |
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412 |
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413 void add_reference(OopOrNarrowOopStar from, int tid) { |
342 | 414 // Expand if necessary. |
415 PerRegionTable** pt = par_tables(); | |
416 if (pt != NULL) { | |
417 // We always have to assume that mods to table 0 are in parallel, | |
418 // because of the claiming scheme in parallel expansion. A thread | |
419 // with tid != 0 that finds the table to be NULL, but doesn't succeed | |
420 // in claiming the right of expanding it, will end up in the else | |
421 // clause of the above if test. That thread could be delayed, and a | |
422 // thread 0 add reference could see the table expanded, and come | |
423 // here. Both threads would be adding in parallel. But we get to | |
424 // not use atomics for tids > 0. | |
425 if (tid == 0) { | |
426 PerRegionTable::add_reference(from); | |
427 } else { | |
428 pt[tid-1]->seq_add_reference(from); | |
429 } | |
430 } else { | |
431 // Not expanded -- add to the base table. | |
432 PerRegionTable::add_reference(from); | |
433 } | |
434 } | |
435 | |
436 void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { | |
437 assert(_par_tables == NULL, "Precondition"); | |
438 PerRegionTable::scrub(ctbs, card_bm); | |
439 } | |
440 | |
441 size_t mem_size() const { | |
442 size_t res = | |
443 PerRegionTable::mem_size() + sizeof(this) - sizeof(PerRegionTable); | |
444 if (_par_tables != NULL) { | |
445 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { | |
446 res += _par_tables[i]->mem_size(); | |
447 } | |
448 } | |
449 return res; | |
450 } | |
451 | |
452 static size_t fl_mem_size() { | |
453 PosParPRT* cur = _free_list; | |
454 size_t res = 0; | |
455 while (cur != NULL) { | |
456 res += sizeof(PosParPRT); | |
457 cur = cur->next(); | |
458 } | |
459 return res; | |
460 } | |
461 | |
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462 bool contains_reference(OopOrNarrowOopStar from) const { |
342 | 463 if (PerRegionTable::contains_reference(from)) return true; |
464 if (_par_tables != NULL) { | |
465 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { | |
466 if (_par_tables[i]->contains_reference(from)) return true; | |
467 } | |
468 } | |
469 return false; | |
470 } | |
471 | |
472 static void par_contract_all(); | |
473 }; | |
474 | |
475 void PosParPRT::par_contract_all() { | |
476 PosParPRT* hd = _par_expanded_list; | |
477 while (hd != NULL) { | |
478 PosParPRT* nxt = hd->next_par_expanded(); | |
479 PosParPRT* res = | |
480 (PosParPRT*) | |
481 Atomic::cmpxchg_ptr(nxt, &_par_expanded_list, hd); | |
482 if (res == hd) { | |
483 // We claimed the right to contract this table. | |
484 hd->set_next_par_expanded(NULL); | |
485 hd->par_contract(); | |
486 hd = _par_expanded_list; | |
487 } else { | |
488 hd = res; | |
489 } | |
490 } | |
491 } | |
492 | |
493 PosParPRT* PosParPRT::_free_list = NULL; | |
494 PosParPRT* PosParPRT::_par_expanded_list = NULL; | |
495 | |
496 jint OtherRegionsTable::_cache_probes = 0; | |
497 jint OtherRegionsTable::_cache_hits = 0; | |
498 | |
499 size_t OtherRegionsTable::_max_fine_entries = 0; | |
500 size_t OtherRegionsTable::_mod_max_fine_entries_mask = 0; | |
501 #if SAMPLE_FOR_EVICTION | |
502 size_t OtherRegionsTable::_fine_eviction_stride = 0; | |
503 size_t OtherRegionsTable::_fine_eviction_sample_size = 0; | |
504 #endif | |
505 | |
506 OtherRegionsTable::OtherRegionsTable(HeapRegion* hr) : | |
507 _g1h(G1CollectedHeap::heap()), | |
508 _m(Mutex::leaf, "An OtherRegionsTable lock", true), | |
509 _hr(hr), | |
510 _coarse_map(G1CollectedHeap::heap()->max_regions(), | |
511 false /* in-resource-area */), | |
512 _fine_grain_regions(NULL), | |
513 _n_fine_entries(0), _n_coarse_entries(0), | |
514 #if SAMPLE_FOR_EVICTION | |
515 _fine_eviction_start(0), | |
516 #endif | |
517 _sparse_table(hr) | |
518 { | |
519 typedef PosParPRT* PosParPRTPtr; | |
520 if (_max_fine_entries == 0) { | |
521 assert(_mod_max_fine_entries_mask == 0, "Both or none."); | |
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522 size_t max_entries_log = (size_t)log2_long((jlong)G1RSetRegionEntries); |
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523 _max_fine_entries = (size_t)(1 << max_entries_log); |
342 | 524 _mod_max_fine_entries_mask = _max_fine_entries - 1; |
525 #if SAMPLE_FOR_EVICTION | |
526 assert(_fine_eviction_sample_size == 0 | |
527 && _fine_eviction_stride == 0, "All init at same time."); | |
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528 _fine_eviction_sample_size = MAX2((size_t)4, max_entries_log); |
342 | 529 _fine_eviction_stride = _max_fine_entries / _fine_eviction_sample_size; |
530 #endif | |
531 } | |
532 _fine_grain_regions = new PosParPRTPtr[_max_fine_entries]; | |
533 if (_fine_grain_regions == NULL) | |
534 vm_exit_out_of_memory(sizeof(void*)*_max_fine_entries, | |
535 "Failed to allocate _fine_grain_entries."); | |
536 for (size_t i = 0; i < _max_fine_entries; i++) { | |
537 _fine_grain_regions[i] = NULL; | |
538 } | |
539 } | |
540 | |
541 int** OtherRegionsTable::_from_card_cache = NULL; | |
542 size_t OtherRegionsTable::_from_card_cache_max_regions = 0; | |
543 size_t OtherRegionsTable::_from_card_cache_mem_size = 0; | |
544 | |
545 void OtherRegionsTable::init_from_card_cache(size_t max_regions) { | |
546 _from_card_cache_max_regions = max_regions; | |
547 | |
548 int n_par_rs = HeapRegionRemSet::num_par_rem_sets(); | |
549 _from_card_cache = NEW_C_HEAP_ARRAY(int*, n_par_rs); | |
550 for (int i = 0; i < n_par_rs; i++) { | |
551 _from_card_cache[i] = NEW_C_HEAP_ARRAY(int, max_regions); | |
552 for (size_t j = 0; j < max_regions; j++) { | |
553 _from_card_cache[i][j] = -1; // An invalid value. | |
554 } | |
555 } | |
556 _from_card_cache_mem_size = n_par_rs * max_regions * sizeof(int); | |
557 } | |
558 | |
559 void OtherRegionsTable::shrink_from_card_cache(size_t new_n_regs) { | |
560 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
561 assert(new_n_regs <= _from_card_cache_max_regions, "Must be within max."); | |
562 for (size_t j = new_n_regs; j < _from_card_cache_max_regions; j++) { | |
563 _from_card_cache[i][j] = -1; // An invalid value. | |
564 } | |
565 } | |
566 } | |
567 | |
568 #ifndef PRODUCT | |
569 void OtherRegionsTable::print_from_card_cache() { | |
570 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
571 for (size_t j = 0; j < _from_card_cache_max_regions; j++) { | |
572 gclog_or_tty->print_cr("_from_card_cache[%d][%d] = %d.", | |
573 i, j, _from_card_cache[i][j]); | |
574 } | |
575 } | |
576 } | |
577 #endif | |
578 | |
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579 void OtherRegionsTable::add_reference(OopOrNarrowOopStar from, int tid) { |
342 | 580 size_t cur_hrs_ind = hr()->hrs_index(); |
581 | |
582 #if HRRS_VERBOSE | |
583 gclog_or_tty->print_cr("ORT::add_reference_work(" PTR_FORMAT "->" PTR_FORMAT ").", | |
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584 from, |
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585 UseCompressedOops |
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586 ? oopDesc::load_decode_heap_oop((narrowOop*)from) |
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587 : oopDesc::load_decode_heap_oop((oop*)from)); |
342 | 588 #endif |
589 | |
590 int from_card = (int)(uintptr_t(from) >> CardTableModRefBS::card_shift); | |
591 | |
592 #if HRRS_VERBOSE | |
593 gclog_or_tty->print_cr("Table for [" PTR_FORMAT "...): card %d (cache = %d)", | |
594 hr()->bottom(), from_card, | |
595 _from_card_cache[tid][cur_hrs_ind]); | |
596 #endif | |
597 | |
598 #define COUNT_CACHE 0 | |
599 #if COUNT_CACHE | |
600 jint p = Atomic::add(1, &_cache_probes); | |
601 if ((p % 10000) == 0) { | |
602 jint hits = _cache_hits; | |
603 gclog_or_tty->print_cr("%d/%d = %5.2f%% RS cache hits.", | |
604 _cache_hits, p, 100.0* (float)hits/(float)p); | |
605 } | |
606 #endif | |
607 if (from_card == _from_card_cache[tid][cur_hrs_ind]) { | |
608 #if HRRS_VERBOSE | |
609 gclog_or_tty->print_cr(" from-card cache hit."); | |
610 #endif | |
611 #if COUNT_CACHE | |
612 Atomic::inc(&_cache_hits); | |
613 #endif | |
614 assert(contains_reference(from), "We just added it!"); | |
615 return; | |
616 } else { | |
617 _from_card_cache[tid][cur_hrs_ind] = from_card; | |
618 } | |
619 | |
620 // Note that this may be a continued H region. | |
621 HeapRegion* from_hr = _g1h->heap_region_containing_raw(from); | |
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622 RegionIdx_t from_hrs_ind = (RegionIdx_t) from_hr->hrs_index(); |
342 | 623 |
624 // If the region is already coarsened, return. | |
625 if (_coarse_map.at(from_hrs_ind)) { | |
626 #if HRRS_VERBOSE | |
627 gclog_or_tty->print_cr(" coarse map hit."); | |
628 #endif | |
629 assert(contains_reference(from), "We just added it!"); | |
630 return; | |
631 } | |
632 | |
633 // Otherwise find a per-region table to add it to. | |
634 size_t ind = from_hrs_ind & _mod_max_fine_entries_mask; | |
635 PosParPRT* prt = find_region_table(ind, from_hr); | |
636 if (prt == NULL) { | |
637 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
638 // Confirm that it's really not there... | |
639 prt = find_region_table(ind, from_hr); | |
640 if (prt == NULL) { | |
641 | |
642 uintptr_t from_hr_bot_card_index = | |
643 uintptr_t(from_hr->bottom()) | |
644 >> CardTableModRefBS::card_shift; | |
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645 CardIdx_t card_index = from_card - from_hr_bot_card_index; |
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646 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
342 | 647 "Must be in range."); |
648 if (G1HRRSUseSparseTable && | |
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649 _sparse_table.add_card(from_hrs_ind, card_index)) { |
342 | 650 if (G1RecordHRRSOops) { |
651 HeapRegionRemSet::record(hr(), from); | |
652 #if HRRS_VERBOSE | |
653 gclog_or_tty->print(" Added card " PTR_FORMAT " to region " | |
654 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", | |
655 align_size_down(uintptr_t(from), | |
656 CardTableModRefBS::card_size), | |
657 hr()->bottom(), from); | |
658 #endif | |
659 } | |
660 #if HRRS_VERBOSE | |
661 gclog_or_tty->print_cr(" added card to sparse table."); | |
662 #endif | |
663 assert(contains_reference_locked(from), "We just added it!"); | |
664 return; | |
665 } else { | |
666 #if HRRS_VERBOSE | |
667 gclog_or_tty->print_cr(" [tid %d] sparse table entry " | |
668 "overflow(f: %d, t: %d)", | |
669 tid, from_hrs_ind, cur_hrs_ind); | |
670 #endif | |
671 } | |
672 | |
673 if (_n_fine_entries == _max_fine_entries) { | |
674 prt = delete_region_table(); | |
675 } else { | |
676 prt = PosParPRT::alloc(from_hr); | |
677 } | |
678 prt->init(from_hr); | |
679 | |
680 PosParPRT* first_prt = _fine_grain_regions[ind]; | |
681 prt->set_next(first_prt); // XXX Maybe move to init? | |
682 _fine_grain_regions[ind] = prt; | |
683 _n_fine_entries++; | |
684 | |
685 if (G1HRRSUseSparseTable) { | |
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686 // Transfer from sparse to fine-grain. |
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687 SparsePRTEntry *sprt_entry = _sparse_table.get_entry(from_hrs_ind); |
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688 assert(sprt_entry != NULL, "There should have been an entry"); |
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689 for (int i = 0; i < SparsePRTEntry::cards_num(); i++) { |
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690 CardIdx_t c = sprt_entry->card(i); |
342 | 691 if (c != SparsePRTEntry::NullEntry) { |
692 prt->add_card(c); | |
693 } | |
694 } | |
695 // Now we can delete the sparse entry. | |
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696 bool res = _sparse_table.delete_entry(from_hrs_ind); |
342 | 697 assert(res, "It should have been there."); |
698 } | |
699 } | |
700 assert(prt != NULL && prt->hr() == from_hr, "consequence"); | |
701 } | |
702 // Note that we can't assert "prt->hr() == from_hr", because of the | |
703 // possibility of concurrent reuse. But see head comment of | |
704 // OtherRegionsTable for why this is OK. | |
705 assert(prt != NULL, "Inv"); | |
706 | |
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707 if (prt->should_expand(tid)) { |
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708 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); |
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709 HeapRegion* prt_hr = prt->hr(); |
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710 if (prt_hr == from_hr) { |
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711 // Make sure the table still corresponds to the same region |
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712 prt->par_expand(); |
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713 prt->add_reference(from, tid); |
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714 } |
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715 // else: The table has been concurrently coarsened, evicted, and |
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716 // the table data structure re-used for another table. So, we |
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717 // don't need to add the reference any more given that the table |
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718 // has been coarsened and the whole region will be scanned anyway. |
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719 } else { |
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720 prt->add_reference(from, tid); |
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721 } |
342 | 722 if (G1RecordHRRSOops) { |
723 HeapRegionRemSet::record(hr(), from); | |
724 #if HRRS_VERBOSE | |
725 gclog_or_tty->print("Added card " PTR_FORMAT " to region " | |
726 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", | |
727 align_size_down(uintptr_t(from), | |
728 CardTableModRefBS::card_size), | |
729 hr()->bottom(), from); | |
730 #endif | |
731 } | |
732 assert(contains_reference(from), "We just added it!"); | |
733 } | |
734 | |
735 PosParPRT* | |
736 OtherRegionsTable::find_region_table(size_t ind, HeapRegion* hr) const { | |
737 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
738 PosParPRT* prt = _fine_grain_regions[ind]; | |
739 while (prt != NULL && prt->hr() != hr) { | |
740 prt = prt->next(); | |
741 } | |
742 // Loop postcondition is the method postcondition. | |
743 return prt; | |
744 } | |
745 | |
746 | |
747 #define DRT_CENSUS 0 | |
748 | |
749 #if DRT_CENSUS | |
750 static const int HistoSize = 6; | |
751 static int global_histo[HistoSize] = { 0, 0, 0, 0, 0, 0 }; | |
752 static int coarsenings = 0; | |
753 static int occ_sum = 0; | |
754 #endif | |
755 | |
756 jint OtherRegionsTable::_n_coarsenings = 0; | |
757 | |
758 PosParPRT* OtherRegionsTable::delete_region_table() { | |
759 #if DRT_CENSUS | |
760 int histo[HistoSize] = { 0, 0, 0, 0, 0, 0 }; | |
761 const int histo_limits[] = { 1, 4, 16, 64, 256, 2048 }; | |
762 #endif | |
763 | |
764 assert(_m.owned_by_self(), "Precondition"); | |
765 assert(_n_fine_entries == _max_fine_entries, "Precondition"); | |
766 PosParPRT* max = NULL; | |
767 jint max_occ = 0; | |
768 PosParPRT** max_prev; | |
769 size_t max_ind; | |
770 | |
771 #if SAMPLE_FOR_EVICTION | |
772 size_t i = _fine_eviction_start; | |
773 for (size_t k = 0; k < _fine_eviction_sample_size; k++) { | |
774 size_t ii = i; | |
775 // Make sure we get a non-NULL sample. | |
776 while (_fine_grain_regions[ii] == NULL) { | |
777 ii++; | |
778 if (ii == _max_fine_entries) ii = 0; | |
779 guarantee(ii != i, "We must find one."); | |
780 } | |
781 PosParPRT** prev = &_fine_grain_regions[ii]; | |
782 PosParPRT* cur = *prev; | |
783 while (cur != NULL) { | |
784 jint cur_occ = cur->occupied(); | |
785 if (max == NULL || cur_occ > max_occ) { | |
786 max = cur; | |
787 max_prev = prev; | |
788 max_ind = i; | |
789 max_occ = cur_occ; | |
790 } | |
791 prev = cur->next_addr(); | |
792 cur = cur->next(); | |
793 } | |
794 i = i + _fine_eviction_stride; | |
795 if (i >= _n_fine_entries) i = i - _n_fine_entries; | |
796 } | |
797 _fine_eviction_start++; | |
798 if (_fine_eviction_start >= _n_fine_entries) | |
799 _fine_eviction_start -= _n_fine_entries; | |
800 #else | |
801 for (int i = 0; i < _max_fine_entries; i++) { | |
802 PosParPRT** prev = &_fine_grain_regions[i]; | |
803 PosParPRT* cur = *prev; | |
804 while (cur != NULL) { | |
805 jint cur_occ = cur->occupied(); | |
806 #if DRT_CENSUS | |
807 for (int k = 0; k < HistoSize; k++) { | |
808 if (cur_occ <= histo_limits[k]) { | |
809 histo[k]++; global_histo[k]++; break; | |
810 } | |
811 } | |
812 #endif | |
813 if (max == NULL || cur_occ > max_occ) { | |
814 max = cur; | |
815 max_prev = prev; | |
816 max_ind = i; | |
817 max_occ = cur_occ; | |
818 } | |
819 prev = cur->next_addr(); | |
820 cur = cur->next(); | |
821 } | |
822 } | |
823 #endif | |
824 // XXX | |
825 guarantee(max != NULL, "Since _n_fine_entries > 0"); | |
826 #if DRT_CENSUS | |
827 gclog_or_tty->print_cr("In a coarsening: histo of occs:"); | |
828 for (int k = 0; k < HistoSize; k++) { | |
829 gclog_or_tty->print_cr(" <= %4d: %5d.", histo_limits[k], histo[k]); | |
830 } | |
831 coarsenings++; | |
832 occ_sum += max_occ; | |
833 if ((coarsenings % 100) == 0) { | |
834 gclog_or_tty->print_cr("\ncoarsenings = %d; global summary:", coarsenings); | |
835 for (int k = 0; k < HistoSize; k++) { | |
836 gclog_or_tty->print_cr(" <= %4d: %5d.", histo_limits[k], global_histo[k]); | |
837 } | |
838 gclog_or_tty->print_cr("Avg occ of deleted region = %6.2f.", | |
839 (float)occ_sum/(float)coarsenings); | |
840 } | |
841 #endif | |
842 | |
843 // Set the corresponding coarse bit. | |
3766 | 844 size_t max_hrs_index = max->hr()->hrs_index(); |
342 | 845 if (!_coarse_map.at(max_hrs_index)) { |
846 _coarse_map.at_put(max_hrs_index, true); | |
847 _n_coarse_entries++; | |
848 #if 0 | |
849 gclog_or_tty->print("Coarsened entry in region [" PTR_FORMAT "...] " | |
850 "for region [" PTR_FORMAT "...] (%d coarse entries).\n", | |
851 hr()->bottom(), | |
852 max->hr()->bottom(), | |
853 _n_coarse_entries); | |
854 #endif | |
855 } | |
856 | |
857 // Unsplice. | |
858 *max_prev = max->next(); | |
859 Atomic::inc(&_n_coarsenings); | |
860 _n_fine_entries--; | |
861 return max; | |
862 } | |
863 | |
864 | |
865 // At present, this must be called stop-world single-threaded. | |
866 void OtherRegionsTable::scrub(CardTableModRefBS* ctbs, | |
867 BitMap* region_bm, BitMap* card_bm) { | |
868 // First eliminated garbage regions from the coarse map. | |
869 if (G1RSScrubVerbose) | |
3766 | 870 gclog_or_tty->print_cr("Scrubbing region "SIZE_FORMAT":", |
871 hr()->hrs_index()); | |
342 | 872 |
873 assert(_coarse_map.size() == region_bm->size(), "Precondition"); | |
874 if (G1RSScrubVerbose) | |
875 gclog_or_tty->print(" Coarse map: before = %d...", _n_coarse_entries); | |
876 _coarse_map.set_intersection(*region_bm); | |
877 _n_coarse_entries = _coarse_map.count_one_bits(); | |
878 if (G1RSScrubVerbose) | |
879 gclog_or_tty->print_cr(" after = %d.", _n_coarse_entries); | |
880 | |
881 // Now do the fine-grained maps. | |
882 for (size_t i = 0; i < _max_fine_entries; i++) { | |
883 PosParPRT* cur = _fine_grain_regions[i]; | |
884 PosParPRT** prev = &_fine_grain_regions[i]; | |
885 while (cur != NULL) { | |
886 PosParPRT* nxt = cur->next(); | |
887 // If the entire region is dead, eliminate. | |
888 if (G1RSScrubVerbose) | |
3766 | 889 gclog_or_tty->print_cr(" For other region "SIZE_FORMAT":", |
890 cur->hr()->hrs_index()); | |
342 | 891 if (!region_bm->at(cur->hr()->hrs_index())) { |
892 *prev = nxt; | |
893 cur->set_next(NULL); | |
894 _n_fine_entries--; | |
895 if (G1RSScrubVerbose) | |
896 gclog_or_tty->print_cr(" deleted via region map."); | |
897 PosParPRT::free(cur); | |
898 } else { | |
899 // Do fine-grain elimination. | |
900 if (G1RSScrubVerbose) | |
901 gclog_or_tty->print(" occ: before = %4d.", cur->occupied()); | |
902 cur->scrub(ctbs, card_bm); | |
903 if (G1RSScrubVerbose) | |
904 gclog_or_tty->print_cr(" after = %4d.", cur->occupied()); | |
905 // Did that empty the table completely? | |
906 if (cur->occupied() == 0) { | |
907 *prev = nxt; | |
908 cur->set_next(NULL); | |
909 _n_fine_entries--; | |
910 PosParPRT::free(cur); | |
911 } else { | |
912 prev = cur->next_addr(); | |
913 } | |
914 } | |
915 cur = nxt; | |
916 } | |
917 } | |
918 // Since we may have deleted a from_card_cache entry from the RS, clear | |
919 // the FCC. | |
920 clear_fcc(); | |
921 } | |
922 | |
923 | |
924 size_t OtherRegionsTable::occupied() const { | |
925 // Cast away const in this case. | |
926 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
927 size_t sum = occ_fine(); | |
928 sum += occ_sparse(); | |
929 sum += occ_coarse(); | |
930 return sum; | |
931 } | |
932 | |
933 size_t OtherRegionsTable::occ_fine() const { | |
934 size_t sum = 0; | |
935 for (size_t i = 0; i < _max_fine_entries; i++) { | |
936 PosParPRT* cur = _fine_grain_regions[i]; | |
937 while (cur != NULL) { | |
938 sum += cur->occupied(); | |
939 cur = cur->next(); | |
940 } | |
941 } | |
942 return sum; | |
943 } | |
944 | |
945 size_t OtherRegionsTable::occ_coarse() const { | |
942
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946 return (_n_coarse_entries * HeapRegion::CardsPerRegion); |
342 | 947 } |
948 | |
949 size_t OtherRegionsTable::occ_sparse() const { | |
950 return _sparse_table.occupied(); | |
951 } | |
952 | |
953 size_t OtherRegionsTable::mem_size() const { | |
954 // Cast away const in this case. | |
955 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
956 size_t sum = 0; | |
957 for (size_t i = 0; i < _max_fine_entries; i++) { | |
958 PosParPRT* cur = _fine_grain_regions[i]; | |
959 while (cur != NULL) { | |
960 sum += cur->mem_size(); | |
961 cur = cur->next(); | |
962 } | |
963 } | |
964 sum += (sizeof(PosParPRT*) * _max_fine_entries); | |
965 sum += (_coarse_map.size_in_words() * HeapWordSize); | |
966 sum += (_sparse_table.mem_size()); | |
967 sum += sizeof(*this) - sizeof(_sparse_table); // Avoid double counting above. | |
968 return sum; | |
969 } | |
970 | |
971 size_t OtherRegionsTable::static_mem_size() { | |
972 return _from_card_cache_mem_size; | |
973 } | |
974 | |
975 size_t OtherRegionsTable::fl_mem_size() { | |
976 return PerRegionTable::fl_mem_size() + PosParPRT::fl_mem_size(); | |
977 } | |
978 | |
979 void OtherRegionsTable::clear_fcc() { | |
980 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
981 _from_card_cache[i][hr()->hrs_index()] = -1; | |
982 } | |
983 } | |
984 | |
985 void OtherRegionsTable::clear() { | |
986 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
987 for (size_t i = 0; i < _max_fine_entries; i++) { | |
988 PosParPRT* cur = _fine_grain_regions[i]; | |
989 while (cur != NULL) { | |
990 PosParPRT* nxt = cur->next(); | |
991 PosParPRT::free(cur); | |
992 cur = nxt; | |
993 } | |
994 _fine_grain_regions[i] = NULL; | |
995 } | |
996 _sparse_table.clear(); | |
997 _coarse_map.clear(); | |
998 _n_fine_entries = 0; | |
999 _n_coarse_entries = 0; | |
1000 | |
1001 clear_fcc(); | |
1002 } | |
1003 | |
1004 void OtherRegionsTable::clear_incoming_entry(HeapRegion* from_hr) { | |
1005 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
3766 | 1006 size_t hrs_ind = from_hr->hrs_index(); |
342 | 1007 size_t ind = hrs_ind & _mod_max_fine_entries_mask; |
1008 if (del_single_region_table(ind, from_hr)) { | |
1009 assert(!_coarse_map.at(hrs_ind), "Inv"); | |
1010 } else { | |
1011 _coarse_map.par_at_put(hrs_ind, 0); | |
1012 } | |
1013 // Check to see if any of the fcc entries come from here. | |
3766 | 1014 size_t hr_ind = hr()->hrs_index(); |
342 | 1015 for (int tid = 0; tid < HeapRegionRemSet::num_par_rem_sets(); tid++) { |
1016 int fcc_ent = _from_card_cache[tid][hr_ind]; | |
1017 if (fcc_ent != -1) { | |
1018 HeapWord* card_addr = (HeapWord*) | |
1019 (uintptr_t(fcc_ent) << CardTableModRefBS::card_shift); | |
1020 if (hr()->is_in_reserved(card_addr)) { | |
1021 // Clear the from card cache. | |
1022 _from_card_cache[tid][hr_ind] = -1; | |
1023 } | |
1024 } | |
1025 } | |
1026 } | |
1027 | |
1028 bool OtherRegionsTable::del_single_region_table(size_t ind, | |
1029 HeapRegion* hr) { | |
1030 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
1031 PosParPRT** prev_addr = &_fine_grain_regions[ind]; | |
1032 PosParPRT* prt = *prev_addr; | |
1033 while (prt != NULL && prt->hr() != hr) { | |
1034 prev_addr = prt->next_addr(); | |
1035 prt = prt->next(); | |
1036 } | |
1037 if (prt != NULL) { | |
1038 assert(prt->hr() == hr, "Loop postcondition."); | |
1039 *prev_addr = prt->next(); | |
1040 PosParPRT::free(prt); | |
1041 _n_fine_entries--; | |
1042 return true; | |
1043 } else { | |
1044 return false; | |
1045 } | |
1046 } | |
1047 | |
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1048 bool OtherRegionsTable::contains_reference(OopOrNarrowOopStar from) const { |
342 | 1049 // Cast away const in this case. |
1050 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
1051 return contains_reference_locked(from); | |
1052 } | |
1053 | |
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1054 bool OtherRegionsTable::contains_reference_locked(OopOrNarrowOopStar from) const { |
342 | 1055 HeapRegion* hr = _g1h->heap_region_containing_raw(from); |
1056 if (hr == NULL) return false; | |
807
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1057 RegionIdx_t hr_ind = (RegionIdx_t) hr->hrs_index(); |
342 | 1058 // Is this region in the coarse map? |
1059 if (_coarse_map.at(hr_ind)) return true; | |
1060 | |
1061 PosParPRT* prt = find_region_table(hr_ind & _mod_max_fine_entries_mask, | |
1062 hr); | |
1063 if (prt != NULL) { | |
1064 return prt->contains_reference(from); | |
1065 | |
1066 } else { | |
1067 uintptr_t from_card = | |
1068 (uintptr_t(from) >> CardTableModRefBS::card_shift); | |
1069 uintptr_t hr_bot_card_index = | |
1070 uintptr_t(hr->bottom()) >> CardTableModRefBS::card_shift; | |
1071 assert(from_card >= hr_bot_card_index, "Inv"); | |
807
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1072 CardIdx_t card_index = from_card - hr_bot_card_index; |
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1073 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
942
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1074 "Must be in range."); |
807
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1075 return _sparse_table.contains_card(hr_ind, card_index); |
342 | 1076 } |
1077 | |
1078 | |
1079 } | |
1080 | |
2173 | 1081 void |
1082 OtherRegionsTable::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
1083 _sparse_table.do_cleanup_work(hrrs_cleanup_task); | |
1084 } | |
1085 | |
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1086 // Determines how many threads can add records to an rset in parallel. |
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1087 // This can be done by either mutator threads together with the |
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1088 // concurrent refinement threads or GC threads. |
342 | 1089 int HeapRegionRemSet::num_par_rem_sets() { |
795
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1090 return (int)MAX2(DirtyCardQueueSet::num_par_ids() + ConcurrentG1Refine::thread_num(), ParallelGCThreads); |
342 | 1091 } |
1092 | |
1093 HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, | |
1094 HeapRegion* hr) | |
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1095 : _bosa(bosa), _other_regions(hr) { |
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1096 reset_for_par_iteration(); |
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1097 } |
342 | 1098 |
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1099 void HeapRegionRemSet::setup_remset_size() { |
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1100 // Setup sparse and fine-grain tables sizes. |
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1101 // table_size = base * (log(region_size / 1M) + 1) |
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1102 int region_size_log_mb = MAX2((int)HeapRegion::LogOfHRGrainBytes - (int)LOG_M, 0); |
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1103 if (FLAG_IS_DEFAULT(G1RSetSparseRegionEntries)) { |
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1104 G1RSetSparseRegionEntries = G1RSetSparseRegionEntriesBase * (region_size_log_mb + 1); |
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1105 } |
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1106 if (FLAG_IS_DEFAULT(G1RSetRegionEntries)) { |
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1107 G1RSetRegionEntries = G1RSetRegionEntriesBase * (region_size_log_mb + 1); |
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1108 } |
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1109 guarantee(G1RSetSparseRegionEntries > 0 && G1RSetRegionEntries > 0 , "Sanity"); |
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1110 } |
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1111 |
342 | 1112 bool HeapRegionRemSet::claim_iter() { |
1113 if (_iter_state != Unclaimed) return false; | |
1114 jint res = Atomic::cmpxchg(Claimed, (jint*)(&_iter_state), Unclaimed); | |
1115 return (res == Unclaimed); | |
1116 } | |
1117 | |
1118 void HeapRegionRemSet::set_iter_complete() { | |
1119 _iter_state = Complete; | |
1120 } | |
1121 | |
1122 bool HeapRegionRemSet::iter_is_complete() { | |
1123 return _iter_state == Complete; | |
1124 } | |
1125 | |
1126 void HeapRegionRemSet::init_iterator(HeapRegionRemSetIterator* iter) const { | |
1127 iter->initialize(this); | |
1128 } | |
1129 | |
1130 #ifndef PRODUCT | |
1131 void HeapRegionRemSet::print() const { | |
1132 HeapRegionRemSetIterator iter; | |
1133 init_iterator(&iter); | |
1134 size_t card_index; | |
1135 while (iter.has_next(card_index)) { | |
1136 HeapWord* card_start = | |
1137 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
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1138 gclog_or_tty->print_cr(" Card " PTR_FORMAT, card_start); |
342 | 1139 } |
1140 // XXX | |
1141 if (iter.n_yielded() != occupied()) { | |
1142 gclog_or_tty->print_cr("Yielded disagrees with occupied:"); | |
1143 gclog_or_tty->print_cr(" %6d yielded (%6d coarse, %6d fine).", | |
1144 iter.n_yielded(), | |
1145 iter.n_yielded_coarse(), iter.n_yielded_fine()); | |
1146 gclog_or_tty->print_cr(" %6d occ (%6d coarse, %6d fine).", | |
1147 occupied(), occ_coarse(), occ_fine()); | |
1148 } | |
1149 guarantee(iter.n_yielded() == occupied(), | |
1150 "We should have yielded all the represented cards."); | |
1151 } | |
1152 #endif | |
1153 | |
1154 void HeapRegionRemSet::cleanup() { | |
1155 SparsePRT::cleanup_all(); | |
1156 } | |
1157 | |
1158 void HeapRegionRemSet::par_cleanup() { | |
1159 PosParPRT::par_contract_all(); | |
1160 } | |
1161 | |
1162 void HeapRegionRemSet::clear() { | |
1163 _other_regions.clear(); | |
1164 assert(occupied() == 0, "Should be clear."); | |
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1165 reset_for_par_iteration(); |
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1166 } |
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1167 |
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1168 void HeapRegionRemSet::reset_for_par_iteration() { |
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1169 _iter_state = Unclaimed; |
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1170 _iter_claimed = 0; |
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1171 // It's good to check this to make sure that the two methods are in sync. |
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1172 assert(verify_ready_for_par_iteration(), "post-condition"); |
342 | 1173 } |
1174 | |
1175 void HeapRegionRemSet::scrub(CardTableModRefBS* ctbs, | |
1176 BitMap* region_bm, BitMap* card_bm) { | |
1177 _other_regions.scrub(ctbs, region_bm, card_bm); | |
1178 } | |
1179 | |
1180 //-------------------- Iteration -------------------- | |
1181 | |
1182 HeapRegionRemSetIterator:: | |
1183 HeapRegionRemSetIterator() : | |
1184 _hrrs(NULL), | |
1185 _g1h(G1CollectedHeap::heap()), | |
1186 _bosa(NULL), | |
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1187 _sparse_iter() { } |
342 | 1188 |
1189 void HeapRegionRemSetIterator::initialize(const HeapRegionRemSet* hrrs) { | |
1190 _hrrs = hrrs; | |
1191 _coarse_map = &_hrrs->_other_regions._coarse_map; | |
1192 _fine_grain_regions = _hrrs->_other_regions._fine_grain_regions; | |
1193 _bosa = _hrrs->bosa(); | |
1194 | |
1195 _is = Sparse; | |
1196 // Set these values so that we increment to the first region. | |
1197 _coarse_cur_region_index = -1; | |
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1198 _coarse_cur_region_cur_card = (HeapRegion::CardsPerRegion-1); |
342 | 1199 |
1200 _cur_region_cur_card = 0; | |
1201 | |
1202 _fine_array_index = -1; | |
1203 _fine_cur_prt = NULL; | |
1204 | |
1205 _n_yielded_coarse = 0; | |
1206 _n_yielded_fine = 0; | |
1207 _n_yielded_sparse = 0; | |
1208 | |
1209 _sparse_iter.init(&hrrs->_other_regions._sparse_table); | |
1210 } | |
1211 | |
1212 bool HeapRegionRemSetIterator::coarse_has_next(size_t& card_index) { | |
1213 if (_hrrs->_other_regions._n_coarse_entries == 0) return false; | |
1214 // Go to the next card. | |
1215 _coarse_cur_region_cur_card++; | |
1216 // Was the last the last card in the current region? | |
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1217 if (_coarse_cur_region_cur_card == HeapRegion::CardsPerRegion) { |
342 | 1218 // Yes: find the next region. This may leave _coarse_cur_region_index |
1219 // Set to the last index, in which case there are no more coarse | |
1220 // regions. | |
1221 _coarse_cur_region_index = | |
1222 (int) _coarse_map->get_next_one_offset(_coarse_cur_region_index + 1); | |
1223 if ((size_t)_coarse_cur_region_index < _coarse_map->size()) { | |
1224 _coarse_cur_region_cur_card = 0; | |
1225 HeapWord* r_bot = | |
1226 _g1h->region_at(_coarse_cur_region_index)->bottom(); | |
1227 _cur_region_card_offset = _bosa->index_for(r_bot); | |
1228 } else { | |
1229 return false; | |
1230 } | |
1231 } | |
1232 // If we didn't return false above, then we can yield a card. | |
1233 card_index = _cur_region_card_offset + _coarse_cur_region_cur_card; | |
1234 return true; | |
1235 } | |
1236 | |
1237 void HeapRegionRemSetIterator::fine_find_next_non_null_prt() { | |
1238 // Otherwise, find the next bucket list in the array. | |
1239 _fine_array_index++; | |
1240 while (_fine_array_index < (int) OtherRegionsTable::_max_fine_entries) { | |
1241 _fine_cur_prt = _fine_grain_regions[_fine_array_index]; | |
1242 if (_fine_cur_prt != NULL) return; | |
1243 else _fine_array_index++; | |
1244 } | |
1245 assert(_fine_cur_prt == NULL, "Loop post"); | |
1246 } | |
1247 | |
1248 bool HeapRegionRemSetIterator::fine_has_next(size_t& card_index) { | |
1249 if (fine_has_next()) { | |
1250 _cur_region_cur_card = | |
1251 _fine_cur_prt->_bm.get_next_one_offset(_cur_region_cur_card + 1); | |
1252 } | |
1253 while (!fine_has_next()) { | |
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1254 if (_cur_region_cur_card == (size_t) HeapRegion::CardsPerRegion) { |
342 | 1255 _cur_region_cur_card = 0; |
1256 _fine_cur_prt = _fine_cur_prt->next(); | |
1257 } | |
1258 if (_fine_cur_prt == NULL) { | |
1259 fine_find_next_non_null_prt(); | |
1260 if (_fine_cur_prt == NULL) return false; | |
1261 } | |
1262 assert(_fine_cur_prt != NULL && _cur_region_cur_card == 0, | |
1263 "inv."); | |
1264 HeapWord* r_bot = | |
1265 _fine_cur_prt->hr()->bottom(); | |
1266 _cur_region_card_offset = _bosa->index_for(r_bot); | |
1267 _cur_region_cur_card = _fine_cur_prt->_bm.get_next_one_offset(0); | |
1268 } | |
1269 assert(fine_has_next(), "Or else we exited the loop via the return."); | |
1270 card_index = _cur_region_card_offset + _cur_region_cur_card; | |
1271 return true; | |
1272 } | |
1273 | |
1274 bool HeapRegionRemSetIterator::fine_has_next() { | |
1275 return | |
1276 _fine_cur_prt != NULL && | |
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1277 _cur_region_cur_card < HeapRegion::CardsPerRegion; |
342 | 1278 } |
1279 | |
1280 bool HeapRegionRemSetIterator::has_next(size_t& card_index) { | |
1281 switch (_is) { | |
1282 case Sparse: | |
1283 if (_sparse_iter.has_next(card_index)) { | |
1284 _n_yielded_sparse++; | |
1285 return true; | |
1286 } | |
1287 // Otherwise, deliberate fall-through | |
1288 _is = Fine; | |
1289 case Fine: | |
1290 if (fine_has_next(card_index)) { | |
1291 _n_yielded_fine++; | |
1292 return true; | |
1293 } | |
1294 // Otherwise, deliberate fall-through | |
1295 _is = Coarse; | |
1296 case Coarse: | |
1297 if (coarse_has_next(card_index)) { | |
1298 _n_yielded_coarse++; | |
1299 return true; | |
1300 } | |
1301 // Otherwise... | |
1302 break; | |
1303 } | |
1304 assert(ParallelGCThreads > 1 || | |
1305 n_yielded() == _hrrs->occupied(), | |
1306 "Should have yielded all the cards in the rem set " | |
1307 "(in the non-par case)."); | |
1308 return false; | |
1309 } | |
1310 | |
1311 | |
1312 | |
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1313 OopOrNarrowOopStar* HeapRegionRemSet::_recorded_oops = NULL; |
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1314 HeapWord** HeapRegionRemSet::_recorded_cards = NULL; |
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1315 HeapRegion** HeapRegionRemSet::_recorded_regions = NULL; |
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1316 int HeapRegionRemSet::_n_recorded = 0; |
342 | 1317 |
1318 HeapRegionRemSet::Event* HeapRegionRemSet::_recorded_events = NULL; | |
1319 int* HeapRegionRemSet::_recorded_event_index = NULL; | |
1320 int HeapRegionRemSet::_n_recorded_events = 0; | |
1321 | |
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1322 void HeapRegionRemSet::record(HeapRegion* hr, OopOrNarrowOopStar f) { |
342 | 1323 if (_recorded_oops == NULL) { |
1324 assert(_n_recorded == 0 | |
1325 && _recorded_cards == NULL | |
1326 && _recorded_regions == NULL, | |
1327 "Inv"); | |
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1328 _recorded_oops = NEW_C_HEAP_ARRAY(OopOrNarrowOopStar, MaxRecorded); |
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1329 _recorded_cards = NEW_C_HEAP_ARRAY(HeapWord*, MaxRecorded); |
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1330 _recorded_regions = NEW_C_HEAP_ARRAY(HeapRegion*, MaxRecorded); |
342 | 1331 } |
1332 if (_n_recorded == MaxRecorded) { | |
1333 gclog_or_tty->print_cr("Filled up 'recorded' (%d).", MaxRecorded); | |
1334 } else { | |
1335 _recorded_cards[_n_recorded] = | |
1336 (HeapWord*)align_size_down(uintptr_t(f), | |
1337 CardTableModRefBS::card_size); | |
1338 _recorded_oops[_n_recorded] = f; | |
1339 _recorded_regions[_n_recorded] = hr; | |
1340 _n_recorded++; | |
1341 } | |
1342 } | |
1343 | |
1344 void HeapRegionRemSet::record_event(Event evnt) { | |
1345 if (!G1RecordHRRSEvents) return; | |
1346 | |
1347 if (_recorded_events == NULL) { | |
1348 assert(_n_recorded_events == 0 | |
1349 && _recorded_event_index == NULL, | |
1350 "Inv"); | |
1351 _recorded_events = NEW_C_HEAP_ARRAY(Event, MaxRecordedEvents); | |
1352 _recorded_event_index = NEW_C_HEAP_ARRAY(int, MaxRecordedEvents); | |
1353 } | |
1354 if (_n_recorded_events == MaxRecordedEvents) { | |
1355 gclog_or_tty->print_cr("Filled up 'recorded_events' (%d).", MaxRecordedEvents); | |
1356 } else { | |
1357 _recorded_events[_n_recorded_events] = evnt; | |
1358 _recorded_event_index[_n_recorded_events] = _n_recorded; | |
1359 _n_recorded_events++; | |
1360 } | |
1361 } | |
1362 | |
1363 void HeapRegionRemSet::print_event(outputStream* str, Event evnt) { | |
1364 switch (evnt) { | |
1365 case Event_EvacStart: | |
1366 str->print("Evac Start"); | |
1367 break; | |
1368 case Event_EvacEnd: | |
1369 str->print("Evac End"); | |
1370 break; | |
1371 case Event_RSUpdateEnd: | |
1372 str->print("RS Update End"); | |
1373 break; | |
1374 } | |
1375 } | |
1376 | |
1377 void HeapRegionRemSet::print_recorded() { | |
1378 int cur_evnt = 0; | |
1379 Event cur_evnt_kind; | |
1380 int cur_evnt_ind = 0; | |
1381 if (_n_recorded_events > 0) { | |
1382 cur_evnt_kind = _recorded_events[cur_evnt]; | |
1383 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
1384 } | |
1385 | |
1386 for (int i = 0; i < _n_recorded; i++) { | |
1387 while (cur_evnt < _n_recorded_events && i == cur_evnt_ind) { | |
1388 gclog_or_tty->print("Event: "); | |
1389 print_event(gclog_or_tty, cur_evnt_kind); | |
1390 gclog_or_tty->print_cr(""); | |
1391 cur_evnt++; | |
1392 if (cur_evnt < MaxRecordedEvents) { | |
1393 cur_evnt_kind = _recorded_events[cur_evnt]; | |
1394 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
1395 } | |
1396 } | |
1397 gclog_or_tty->print("Added card " PTR_FORMAT " to region [" PTR_FORMAT "...]" | |
1398 " for ref " PTR_FORMAT ".\n", | |
1399 _recorded_cards[i], _recorded_regions[i]->bottom(), | |
1400 _recorded_oops[i]); | |
1401 } | |
1402 } | |
1403 | |
2173 | 1404 void HeapRegionRemSet::reset_for_cleanup_tasks() { |
1405 SparsePRT::reset_for_cleanup_tasks(); | |
1406 } | |
1407 | |
1408 void HeapRegionRemSet::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
1409 _other_regions.do_cleanup_work(hrrs_cleanup_task); | |
1410 } | |
1411 | |
1412 void | |
1413 HeapRegionRemSet::finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task) { | |
1414 SparsePRT::finish_cleanup_task(hrrs_cleanup_task); | |
1415 } | |
1416 | |
342 | 1417 #ifndef PRODUCT |
1418 void HeapRegionRemSet::test() { | |
1419 os::sleep(Thread::current(), (jlong)5000, false); | |
1420 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1421 | |
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1422 // Run with "-XX:G1LogRSetRegionEntries=2", so that 1 and 5 end up in same |
342 | 1423 // hash bucket. |
1424 HeapRegion* hr0 = g1h->region_at(0); | |
1425 HeapRegion* hr1 = g1h->region_at(1); | |
1426 HeapRegion* hr2 = g1h->region_at(5); | |
1427 HeapRegion* hr3 = g1h->region_at(6); | |
1428 HeapRegion* hr4 = g1h->region_at(7); | |
1429 HeapRegion* hr5 = g1h->region_at(8); | |
1430 | |
1431 HeapWord* hr1_start = hr1->bottom(); | |
1432 HeapWord* hr1_mid = hr1_start + HeapRegion::GrainWords/2; | |
1433 HeapWord* hr1_last = hr1->end() - 1; | |
1434 | |
1435 HeapWord* hr2_start = hr2->bottom(); | |
1436 HeapWord* hr2_mid = hr2_start + HeapRegion::GrainWords/2; | |
1437 HeapWord* hr2_last = hr2->end() - 1; | |
1438 | |
1439 HeapWord* hr3_start = hr3->bottom(); | |
1440 HeapWord* hr3_mid = hr3_start + HeapRegion::GrainWords/2; | |
1441 HeapWord* hr3_last = hr3->end() - 1; | |
1442 | |
1443 HeapRegionRemSet* hrrs = hr0->rem_set(); | |
1444 | |
1445 // Make three references from region 0x101... | |
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1446 hrrs->add_reference((OopOrNarrowOopStar)hr1_start); |
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1447 hrrs->add_reference((OopOrNarrowOopStar)hr1_mid); |
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1448 hrrs->add_reference((OopOrNarrowOopStar)hr1_last); |
342 | 1449 |
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1450 hrrs->add_reference((OopOrNarrowOopStar)hr2_start); |
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1451 hrrs->add_reference((OopOrNarrowOopStar)hr2_mid); |
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1452 hrrs->add_reference((OopOrNarrowOopStar)hr2_last); |
342 | 1453 |
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1454 hrrs->add_reference((OopOrNarrowOopStar)hr3_start); |
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1455 hrrs->add_reference((OopOrNarrowOopStar)hr3_mid); |
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1456 hrrs->add_reference((OopOrNarrowOopStar)hr3_last); |
342 | 1457 |
1458 // Now cause a coarsening. | |
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1459 hrrs->add_reference((OopOrNarrowOopStar)hr4->bottom()); |
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1460 hrrs->add_reference((OopOrNarrowOopStar)hr5->bottom()); |
342 | 1461 |
1462 // Now, does iteration yield these three? | |
1463 HeapRegionRemSetIterator iter; | |
1464 hrrs->init_iterator(&iter); | |
1465 size_t sum = 0; | |
1466 size_t card_index; | |
1467 while (iter.has_next(card_index)) { | |
1468 HeapWord* card_start = | |
1469 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
1470 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); | |
1471 sum++; | |
1472 } | |
1473 guarantee(sum == 11 - 3 + 2048, "Failure"); | |
1474 guarantee(sum == hrrs->occupied(), "Failure"); | |
1475 } | |
1476 #endif |