Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp @ 1995:8df09fb45352
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
Summary: Relaxed the assert by allowing NULL referents when discovery may be concurrent.
Reviewed-by: johnc, jcoomes
| author | ysr |
|---|---|
| date | Thu, 09 Dec 2010 09:22:57 -0800 |
| parents | f95d63e2154a |
| children | 97ba643ea3ed |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 1972 | 2 * Copyright (c) 2001, 2010, 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. | |
| 146 if (loc_hr->is_in_reserved(from)) { | |
| 147 size_t hw_offset = pointer_delta((HeapWord*)from, loc_hr->bottom()); | |
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148 CardIdx_t from_card = (CardIdx_t) |
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149 hw_offset >> (CardTableModRefBS::card_shift - LogHeapWordSize); |
| 342 | 150 |
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151 assert(0 <= from_card && from_card < HeapRegion::CardsPerRegion, |
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152 "Must be in range."); |
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153 add_card_work(from_card, par); |
| 342 | 154 } |
| 155 } | |
| 156 | |
| 157 public: | |
| 158 | |
| 159 HeapRegion* hr() const { return _hr; } | |
| 160 | |
| 161 #if PRT_COUNT_OCCUPIED | |
| 162 jint occupied() const { | |
| 163 // Overkill, but if we ever need it... | |
| 164 // guarantee(_occupied == _bm.count_one_bits(), "Check"); | |
| 165 return _occupied; | |
| 166 } | |
| 167 #else | |
| 168 jint occupied() const { | |
| 169 return _bm.count_one_bits(); | |
| 170 } | |
| 171 #endif | |
| 172 | |
| 173 void init(HeapRegion* hr) { | |
| 174 _hr = hr; | |
| 175 #if PRT_COUNT_OCCUPIED | |
| 176 _occupied = 0; | |
| 177 #endif | |
| 178 _bm.clear(); | |
| 179 } | |
| 180 | |
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181 void add_reference(OopOrNarrowOopStar from) { |
| 342 | 182 add_reference_work(from, /*parallel*/ true); |
| 183 } | |
| 184 | |
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185 void seq_add_reference(OopOrNarrowOopStar from) { |
| 342 | 186 add_reference_work(from, /*parallel*/ false); |
| 187 } | |
| 188 | |
| 189 void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { | |
| 190 HeapWord* hr_bot = hr()->bottom(); | |
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191 size_t hr_first_card_index = ctbs->index_for(hr_bot); |
| 342 | 192 bm()->set_intersection_at_offset(*card_bm, hr_first_card_index); |
| 193 #if PRT_COUNT_OCCUPIED | |
| 194 recount_occupied(); | |
| 195 #endif | |
| 196 } | |
| 197 | |
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198 void add_card(CardIdx_t from_card_index) { |
| 342 | 199 add_card_work(from_card_index, /*parallel*/ true); |
| 200 } | |
| 201 | |
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202 void seq_add_card(CardIdx_t from_card_index) { |
| 342 | 203 add_card_work(from_card_index, /*parallel*/ false); |
| 204 } | |
| 205 | |
| 206 // (Destructively) union the bitmap of the current table into the given | |
| 207 // bitmap (which is assumed to be of the same size.) | |
| 208 void union_bitmap_into(BitMap* bm) { | |
| 209 bm->set_union(_bm); | |
| 210 } | |
| 211 | |
| 212 // Mem size in bytes. | |
| 213 size_t mem_size() const { | |
| 214 return sizeof(this) + _bm.size_in_words() * HeapWordSize; | |
| 215 } | |
| 216 | |
| 217 static size_t fl_mem_size() { | |
| 218 PerRegionTable* cur = _free_list; | |
| 219 size_t res = 0; | |
| 220 while (cur != NULL) { | |
| 221 res += sizeof(PerRegionTable); | |
| 222 cur = cur->next_free(); | |
| 223 } | |
| 224 return res; | |
| 225 } | |
| 226 | |
| 227 // Requires "from" to be in "hr()". | |
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228 bool contains_reference(OopOrNarrowOopStar from) const { |
| 342 | 229 assert(hr()->is_in_reserved(from), "Precondition."); |
| 230 size_t card_ind = pointer_delta(from, hr()->bottom(), | |
| 231 CardTableModRefBS::card_size); | |
| 232 return _bm.at(card_ind); | |
| 233 } | |
| 234 }; | |
| 235 | |
| 236 PerRegionTable* PerRegionTable::_free_list = NULL; | |
| 237 | |
| 238 | |
| 239 #define COUNT_PAR_EXPANDS 0 | |
| 240 | |
| 241 #if COUNT_PAR_EXPANDS | |
| 242 static jint n_par_expands = 0; | |
| 243 static jint n_par_contracts = 0; | |
| 244 static jint par_expand_list_len = 0; | |
| 245 static jint max_par_expand_list_len = 0; | |
| 246 | |
| 247 static void print_par_expand() { | |
| 248 Atomic::inc(&n_par_expands); | |
| 249 Atomic::inc(&par_expand_list_len); | |
| 250 if (par_expand_list_len > max_par_expand_list_len) { | |
| 251 max_par_expand_list_len = par_expand_list_len; | |
| 252 } | |
| 253 if ((n_par_expands % 10) == 0) { | |
| 254 gclog_or_tty->print_cr("\n\n%d par expands: %d contracts, " | |
| 255 "len = %d, max_len = %d\n.", | |
| 256 n_par_expands, n_par_contracts, par_expand_list_len, | |
| 257 max_par_expand_list_len); | |
| 258 } | |
| 259 } | |
| 260 #endif | |
| 261 | |
| 262 class PosParPRT: public PerRegionTable { | |
| 263 PerRegionTable** _par_tables; | |
| 264 | |
| 265 enum SomePrivateConstants { | |
| 266 ReserveParTableExpansion = 1 | |
| 267 }; | |
| 268 | |
| 269 void par_contract() { | |
| 270 assert(_par_tables != NULL, "Precondition."); | |
| 271 int n = HeapRegionRemSet::num_par_rem_sets()-1; | |
| 272 for (int i = 0; i < n; i++) { | |
| 273 _par_tables[i]->union_bitmap_into(bm()); | |
| 274 PerRegionTable::free(_par_tables[i]); | |
| 275 _par_tables[i] = NULL; | |
| 276 } | |
| 277 #if PRT_COUNT_OCCUPIED | |
| 278 // We must recount the "occupied." | |
| 279 recount_occupied(); | |
| 280 #endif | |
| 281 FREE_C_HEAP_ARRAY(PerRegionTable*, _par_tables); | |
| 282 _par_tables = NULL; | |
| 283 #if COUNT_PAR_EXPANDS | |
| 284 Atomic::inc(&n_par_contracts); | |
| 285 Atomic::dec(&par_expand_list_len); | |
| 286 #endif | |
| 287 } | |
| 288 | |
| 289 static PerRegionTable** _par_table_fl; | |
| 290 | |
| 291 PosParPRT* _next; | |
| 292 | |
| 293 static PosParPRT* _free_list; | |
| 294 | |
| 295 PerRegionTable** par_tables() const { | |
| 296 assert(uintptr_t(NULL) == 0, "Assumption."); | |
| 297 if (uintptr_t(_par_tables) <= ReserveParTableExpansion) | |
| 298 return NULL; | |
| 299 else | |
| 300 return _par_tables; | |
| 301 } | |
| 302 | |
| 303 PosParPRT* _next_par_expanded; | |
| 304 PosParPRT* next_par_expanded() { return _next_par_expanded; } | |
| 305 void set_next_par_expanded(PosParPRT* ppprt) { _next_par_expanded = ppprt; } | |
| 306 static PosParPRT* _par_expanded_list; | |
| 307 | |
| 308 public: | |
| 309 | |
| 310 PosParPRT(HeapRegion* hr) : PerRegionTable(hr), _par_tables(NULL) {} | |
| 311 | |
| 312 jint occupied() const { | |
| 313 jint res = PerRegionTable::occupied(); | |
| 314 if (par_tables() != NULL) { | |
| 315 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { | |
| 316 res += par_tables()[i]->occupied(); | |
| 317 } | |
| 318 } | |
| 319 return res; | |
| 320 } | |
| 321 | |
| 322 void init(HeapRegion* hr) { | |
| 323 PerRegionTable::init(hr); | |
| 324 _next = NULL; | |
| 325 if (par_tables() != NULL) { | |
| 326 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { | |
| 327 par_tables()[i]->init(hr); | |
| 328 } | |
| 329 } | |
| 330 } | |
| 331 | |
| 332 static void free(PosParPRT* prt) { | |
| 333 while (true) { | |
| 334 PosParPRT* fl = _free_list; | |
| 335 prt->set_next(fl); | |
| 336 PosParPRT* res = | |
| 337 (PosParPRT*) | |
| 338 Atomic::cmpxchg_ptr(prt, &_free_list, fl); | |
| 339 if (res == fl) return; | |
| 340 } | |
| 341 ShouldNotReachHere(); | |
| 342 } | |
| 343 | |
| 344 static PosParPRT* alloc(HeapRegion* hr) { | |
| 345 PosParPRT* fl = _free_list; | |
| 346 while (fl != NULL) { | |
| 347 PosParPRT* nxt = fl->next(); | |
| 348 PosParPRT* res = | |
| 349 (PosParPRT*) | |
| 350 Atomic::cmpxchg_ptr(nxt, &_free_list, fl); | |
| 351 if (res == fl) { | |
| 352 fl->init(hr); | |
| 353 return fl; | |
| 354 } else { | |
| 355 fl = _free_list; | |
| 356 } | |
| 357 } | |
| 358 assert(fl == NULL, "Loop condition."); | |
| 359 return new PosParPRT(hr); | |
| 360 } | |
| 361 | |
| 362 PosParPRT* next() const { return _next; } | |
| 363 void set_next(PosParPRT* nxt) { _next = nxt; } | |
| 364 PosParPRT** next_addr() { return &_next; } | |
| 365 | |
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366 bool should_expand(int tid) { |
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367 return par_tables() == NULL && tid > 0 && hr()->is_gc_alloc_region(); |
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368 } |
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369 |
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370 void par_expand() { |
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371 int n = HeapRegionRemSet::num_par_rem_sets()-1; |
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372 if (n <= 0) return; |
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373 if (_par_tables == NULL) { |
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374 PerRegionTable* res = |
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375 (PerRegionTable*) |
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376 Atomic::cmpxchg_ptr((PerRegionTable*)ReserveParTableExpansion, |
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377 &_par_tables, NULL); |
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378 if (res != NULL) return; |
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379 // Otherwise, we reserved the right to do the expansion. |
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380 |
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381 PerRegionTable** ptables = NEW_C_HEAP_ARRAY(PerRegionTable*, n); |
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382 for (int i = 0; i < n; i++) { |
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383 PerRegionTable* ptable = PerRegionTable::alloc(hr()); |
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384 ptables[i] = ptable; |
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385 } |
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386 // Here we do not need an atomic. |
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387 _par_tables = ptables; |
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388 #if COUNT_PAR_EXPANDS |
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389 print_par_expand(); |
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390 #endif |
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391 // We must put this table on the expanded list. |
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392 PosParPRT* exp_head = _par_expanded_list; |
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393 while (true) { |
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394 set_next_par_expanded(exp_head); |
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395 PosParPRT* res = |
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396 (PosParPRT*) |
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397 Atomic::cmpxchg_ptr(this, &_par_expanded_list, exp_head); |
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398 if (res == exp_head) return; |
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399 // Otherwise. |
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400 exp_head = res; |
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401 } |
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402 ShouldNotReachHere(); |
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403 } |
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404 } |
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405 |
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406 void add_reference(OopOrNarrowOopStar from, int tid) { |
| 342 | 407 // Expand if necessary. |
| 408 PerRegionTable** pt = par_tables(); | |
| 409 if (pt != NULL) { | |
| 410 // We always have to assume that mods to table 0 are in parallel, | |
| 411 // because of the claiming scheme in parallel expansion. A thread | |
| 412 // with tid != 0 that finds the table to be NULL, but doesn't succeed | |
| 413 // in claiming the right of expanding it, will end up in the else | |
| 414 // clause of the above if test. That thread could be delayed, and a | |
| 415 // thread 0 add reference could see the table expanded, and come | |
| 416 // here. Both threads would be adding in parallel. But we get to | |
| 417 // not use atomics for tids > 0. | |
| 418 if (tid == 0) { | |
| 419 PerRegionTable::add_reference(from); | |
| 420 } else { | |
| 421 pt[tid-1]->seq_add_reference(from); | |
| 422 } | |
| 423 } else { | |
| 424 // Not expanded -- add to the base table. | |
| 425 PerRegionTable::add_reference(from); | |
| 426 } | |
| 427 } | |
| 428 | |
| 429 void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { | |
| 430 assert(_par_tables == NULL, "Precondition"); | |
| 431 PerRegionTable::scrub(ctbs, card_bm); | |
| 432 } | |
| 433 | |
| 434 size_t mem_size() const { | |
| 435 size_t res = | |
| 436 PerRegionTable::mem_size() + sizeof(this) - sizeof(PerRegionTable); | |
| 437 if (_par_tables != NULL) { | |
| 438 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { | |
| 439 res += _par_tables[i]->mem_size(); | |
| 440 } | |
| 441 } | |
| 442 return res; | |
| 443 } | |
| 444 | |
| 445 static size_t fl_mem_size() { | |
| 446 PosParPRT* cur = _free_list; | |
| 447 size_t res = 0; | |
| 448 while (cur != NULL) { | |
| 449 res += sizeof(PosParPRT); | |
| 450 cur = cur->next(); | |
| 451 } | |
| 452 return res; | |
| 453 } | |
| 454 | |
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455 bool contains_reference(OopOrNarrowOopStar from) const { |
| 342 | 456 if (PerRegionTable::contains_reference(from)) return true; |
| 457 if (_par_tables != NULL) { | |
| 458 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { | |
| 459 if (_par_tables[i]->contains_reference(from)) return true; | |
| 460 } | |
| 461 } | |
| 462 return false; | |
| 463 } | |
| 464 | |
| 465 static void par_contract_all(); | |
| 466 | |
| 467 }; | |
| 468 | |
| 469 void PosParPRT::par_contract_all() { | |
| 470 PosParPRT* hd = _par_expanded_list; | |
| 471 while (hd != NULL) { | |
| 472 PosParPRT* nxt = hd->next_par_expanded(); | |
| 473 PosParPRT* res = | |
| 474 (PosParPRT*) | |
| 475 Atomic::cmpxchg_ptr(nxt, &_par_expanded_list, hd); | |
| 476 if (res == hd) { | |
| 477 // We claimed the right to contract this table. | |
| 478 hd->set_next_par_expanded(NULL); | |
| 479 hd->par_contract(); | |
| 480 hd = _par_expanded_list; | |
| 481 } else { | |
| 482 hd = res; | |
| 483 } | |
| 484 } | |
| 485 } | |
| 486 | |
| 487 PosParPRT* PosParPRT::_free_list = NULL; | |
| 488 PosParPRT* PosParPRT::_par_expanded_list = NULL; | |
| 489 | |
| 490 jint OtherRegionsTable::_cache_probes = 0; | |
| 491 jint OtherRegionsTable::_cache_hits = 0; | |
| 492 | |
| 493 size_t OtherRegionsTable::_max_fine_entries = 0; | |
| 494 size_t OtherRegionsTable::_mod_max_fine_entries_mask = 0; | |
| 495 #if SAMPLE_FOR_EVICTION | |
| 496 size_t OtherRegionsTable::_fine_eviction_stride = 0; | |
| 497 size_t OtherRegionsTable::_fine_eviction_sample_size = 0; | |
| 498 #endif | |
| 499 | |
| 500 OtherRegionsTable::OtherRegionsTable(HeapRegion* hr) : | |
| 501 _g1h(G1CollectedHeap::heap()), | |
| 502 _m(Mutex::leaf, "An OtherRegionsTable lock", true), | |
| 503 _hr(hr), | |
| 504 _coarse_map(G1CollectedHeap::heap()->max_regions(), | |
| 505 false /* in-resource-area */), | |
| 506 _fine_grain_regions(NULL), | |
| 507 _n_fine_entries(0), _n_coarse_entries(0), | |
| 508 #if SAMPLE_FOR_EVICTION | |
| 509 _fine_eviction_start(0), | |
| 510 #endif | |
| 511 _sparse_table(hr) | |
| 512 { | |
| 513 typedef PosParPRT* PosParPRTPtr; | |
| 514 if (_max_fine_entries == 0) { | |
| 515 assert(_mod_max_fine_entries_mask == 0, "Both or none."); | |
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516 size_t max_entries_log = (size_t)log2_long((jlong)G1RSetRegionEntries); |
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517 _max_fine_entries = (size_t)(1 << max_entries_log); |
| 342 | 518 _mod_max_fine_entries_mask = _max_fine_entries - 1; |
| 519 #if SAMPLE_FOR_EVICTION | |
| 520 assert(_fine_eviction_sample_size == 0 | |
| 521 && _fine_eviction_stride == 0, "All init at same time."); | |
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522 _fine_eviction_sample_size = MAX2((size_t)4, max_entries_log); |
| 342 | 523 _fine_eviction_stride = _max_fine_entries / _fine_eviction_sample_size; |
| 524 #endif | |
| 525 } | |
| 526 _fine_grain_regions = new PosParPRTPtr[_max_fine_entries]; | |
| 527 if (_fine_grain_regions == NULL) | |
| 528 vm_exit_out_of_memory(sizeof(void*)*_max_fine_entries, | |
| 529 "Failed to allocate _fine_grain_entries."); | |
| 530 for (size_t i = 0; i < _max_fine_entries; i++) { | |
| 531 _fine_grain_regions[i] = NULL; | |
| 532 } | |
| 533 } | |
| 534 | |
| 535 int** OtherRegionsTable::_from_card_cache = NULL; | |
| 536 size_t OtherRegionsTable::_from_card_cache_max_regions = 0; | |
| 537 size_t OtherRegionsTable::_from_card_cache_mem_size = 0; | |
| 538 | |
| 539 void OtherRegionsTable::init_from_card_cache(size_t max_regions) { | |
| 540 _from_card_cache_max_regions = max_regions; | |
| 541 | |
| 542 int n_par_rs = HeapRegionRemSet::num_par_rem_sets(); | |
| 543 _from_card_cache = NEW_C_HEAP_ARRAY(int*, n_par_rs); | |
| 544 for (int i = 0; i < n_par_rs; i++) { | |
| 545 _from_card_cache[i] = NEW_C_HEAP_ARRAY(int, max_regions); | |
| 546 for (size_t j = 0; j < max_regions; j++) { | |
| 547 _from_card_cache[i][j] = -1; // An invalid value. | |
| 548 } | |
| 549 } | |
| 550 _from_card_cache_mem_size = n_par_rs * max_regions * sizeof(int); | |
| 551 } | |
| 552 | |
| 553 void OtherRegionsTable::shrink_from_card_cache(size_t new_n_regs) { | |
| 554 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
| 555 assert(new_n_regs <= _from_card_cache_max_regions, "Must be within max."); | |
| 556 for (size_t j = new_n_regs; j < _from_card_cache_max_regions; j++) { | |
| 557 _from_card_cache[i][j] = -1; // An invalid value. | |
| 558 } | |
| 559 } | |
| 560 } | |
| 561 | |
| 562 #ifndef PRODUCT | |
| 563 void OtherRegionsTable::print_from_card_cache() { | |
| 564 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
| 565 for (size_t j = 0; j < _from_card_cache_max_regions; j++) { | |
| 566 gclog_or_tty->print_cr("_from_card_cache[%d][%d] = %d.", | |
| 567 i, j, _from_card_cache[i][j]); | |
| 568 } | |
| 569 } | |
| 570 } | |
| 571 #endif | |
| 572 | |
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573 void OtherRegionsTable::add_reference(OopOrNarrowOopStar from, int tid) { |
| 342 | 574 size_t cur_hrs_ind = hr()->hrs_index(); |
| 575 | |
| 576 #if HRRS_VERBOSE | |
| 577 gclog_or_tty->print_cr("ORT::add_reference_work(" PTR_FORMAT "->" PTR_FORMAT ").", | |
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578 from, |
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579 UseCompressedOops |
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580 ? oopDesc::load_decode_heap_oop((narrowOop*)from) |
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581 : oopDesc::load_decode_heap_oop((oop*)from)); |
| 342 | 582 #endif |
| 583 | |
| 584 int from_card = (int)(uintptr_t(from) >> CardTableModRefBS::card_shift); | |
| 585 | |
| 586 #if HRRS_VERBOSE | |
| 587 gclog_or_tty->print_cr("Table for [" PTR_FORMAT "...): card %d (cache = %d)", | |
| 588 hr()->bottom(), from_card, | |
| 589 _from_card_cache[tid][cur_hrs_ind]); | |
| 590 #endif | |
| 591 | |
| 592 #define COUNT_CACHE 0 | |
| 593 #if COUNT_CACHE | |
| 594 jint p = Atomic::add(1, &_cache_probes); | |
| 595 if ((p % 10000) == 0) { | |
| 596 jint hits = _cache_hits; | |
| 597 gclog_or_tty->print_cr("%d/%d = %5.2f%% RS cache hits.", | |
| 598 _cache_hits, p, 100.0* (float)hits/(float)p); | |
| 599 } | |
| 600 #endif | |
| 601 if (from_card == _from_card_cache[tid][cur_hrs_ind]) { | |
| 602 #if HRRS_VERBOSE | |
| 603 gclog_or_tty->print_cr(" from-card cache hit."); | |
| 604 #endif | |
| 605 #if COUNT_CACHE | |
| 606 Atomic::inc(&_cache_hits); | |
| 607 #endif | |
| 608 assert(contains_reference(from), "We just added it!"); | |
| 609 return; | |
| 610 } else { | |
| 611 _from_card_cache[tid][cur_hrs_ind] = from_card; | |
| 612 } | |
| 613 | |
| 614 // Note that this may be a continued H region. | |
| 615 HeapRegion* from_hr = _g1h->heap_region_containing_raw(from); | |
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616 RegionIdx_t from_hrs_ind = (RegionIdx_t) from_hr->hrs_index(); |
| 342 | 617 |
| 618 // If the region is already coarsened, return. | |
| 619 if (_coarse_map.at(from_hrs_ind)) { | |
| 620 #if HRRS_VERBOSE | |
| 621 gclog_or_tty->print_cr(" coarse map hit."); | |
| 622 #endif | |
| 623 assert(contains_reference(from), "We just added it!"); | |
| 624 return; | |
| 625 } | |
| 626 | |
| 627 // Otherwise find a per-region table to add it to. | |
| 628 size_t ind = from_hrs_ind & _mod_max_fine_entries_mask; | |
| 629 PosParPRT* prt = find_region_table(ind, from_hr); | |
| 630 if (prt == NULL) { | |
| 631 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
| 632 // Confirm that it's really not there... | |
| 633 prt = find_region_table(ind, from_hr); | |
| 634 if (prt == NULL) { | |
| 635 | |
| 636 uintptr_t from_hr_bot_card_index = | |
| 637 uintptr_t(from_hr->bottom()) | |
| 638 >> CardTableModRefBS::card_shift; | |
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639 CardIdx_t card_index = from_card - from_hr_bot_card_index; |
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640 assert(0 <= card_index && card_index < HeapRegion::CardsPerRegion, |
| 342 | 641 "Must be in range."); |
| 642 if (G1HRRSUseSparseTable && | |
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643 _sparse_table.add_card(from_hrs_ind, card_index)) { |
| 342 | 644 if (G1RecordHRRSOops) { |
| 645 HeapRegionRemSet::record(hr(), from); | |
| 646 #if HRRS_VERBOSE | |
| 647 gclog_or_tty->print(" Added card " PTR_FORMAT " to region " | |
| 648 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", | |
| 649 align_size_down(uintptr_t(from), | |
| 650 CardTableModRefBS::card_size), | |
| 651 hr()->bottom(), from); | |
| 652 #endif | |
| 653 } | |
| 654 #if HRRS_VERBOSE | |
| 655 gclog_or_tty->print_cr(" added card to sparse table."); | |
| 656 #endif | |
| 657 assert(contains_reference_locked(from), "We just added it!"); | |
| 658 return; | |
| 659 } else { | |
| 660 #if HRRS_VERBOSE | |
| 661 gclog_or_tty->print_cr(" [tid %d] sparse table entry " | |
| 662 "overflow(f: %d, t: %d)", | |
| 663 tid, from_hrs_ind, cur_hrs_ind); | |
| 664 #endif | |
| 665 } | |
| 666 | |
| 667 if (_n_fine_entries == _max_fine_entries) { | |
| 668 prt = delete_region_table(); | |
| 669 } else { | |
| 670 prt = PosParPRT::alloc(from_hr); | |
| 671 } | |
| 672 prt->init(from_hr); | |
| 673 | |
| 674 PosParPRT* first_prt = _fine_grain_regions[ind]; | |
| 675 prt->set_next(first_prt); // XXX Maybe move to init? | |
| 676 _fine_grain_regions[ind] = prt; | |
| 677 _n_fine_entries++; | |
| 678 | |
| 679 if (G1HRRSUseSparseTable) { | |
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680 // Transfer from sparse to fine-grain. |
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681 SparsePRTEntry *sprt_entry = _sparse_table.get_entry(from_hrs_ind); |
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682 assert(sprt_entry != NULL, "There should have been an entry"); |
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683 for (int i = 0; i < SparsePRTEntry::cards_num(); i++) { |
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684 CardIdx_t c = sprt_entry->card(i); |
| 342 | 685 if (c != SparsePRTEntry::NullEntry) { |
| 686 prt->add_card(c); | |
| 687 } | |
| 688 } | |
| 689 // Now we can delete the sparse entry. | |
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690 bool res = _sparse_table.delete_entry(from_hrs_ind); |
| 342 | 691 assert(res, "It should have been there."); |
| 692 } | |
| 693 } | |
| 694 assert(prt != NULL && prt->hr() == from_hr, "consequence"); | |
| 695 } | |
| 696 // Note that we can't assert "prt->hr() == from_hr", because of the | |
| 697 // possibility of concurrent reuse. But see head comment of | |
| 698 // OtherRegionsTable for why this is OK. | |
| 699 assert(prt != NULL, "Inv"); | |
| 700 | |
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701 if (prt->should_expand(tid)) { |
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702 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); |
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703 HeapRegion* prt_hr = prt->hr(); |
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704 if (prt_hr == from_hr) { |
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705 // Make sure the table still corresponds to the same region |
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706 prt->par_expand(); |
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707 prt->add_reference(from, tid); |
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708 } |
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709 // else: The table has been concurrently coarsened, evicted, and |
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710 // the table data structure re-used for another table. So, we |
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711 // don't need to add the reference any more given that the table |
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712 // has been coarsened and the whole region will be scanned anyway. |
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713 } else { |
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714 prt->add_reference(from, tid); |
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715 } |
| 342 | 716 if (G1RecordHRRSOops) { |
| 717 HeapRegionRemSet::record(hr(), from); | |
| 718 #if HRRS_VERBOSE | |
| 719 gclog_or_tty->print("Added card " PTR_FORMAT " to region " | |
| 720 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", | |
| 721 align_size_down(uintptr_t(from), | |
| 722 CardTableModRefBS::card_size), | |
| 723 hr()->bottom(), from); | |
| 724 #endif | |
| 725 } | |
| 726 assert(contains_reference(from), "We just added it!"); | |
| 727 } | |
| 728 | |
| 729 PosParPRT* | |
| 730 OtherRegionsTable::find_region_table(size_t ind, HeapRegion* hr) const { | |
| 731 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
| 732 PosParPRT* prt = _fine_grain_regions[ind]; | |
| 733 while (prt != NULL && prt->hr() != hr) { | |
| 734 prt = prt->next(); | |
| 735 } | |
| 736 // Loop postcondition is the method postcondition. | |
| 737 return prt; | |
| 738 } | |
| 739 | |
| 740 | |
| 741 #define DRT_CENSUS 0 | |
| 742 | |
| 743 #if DRT_CENSUS | |
| 744 static const int HistoSize = 6; | |
| 745 static int global_histo[HistoSize] = { 0, 0, 0, 0, 0, 0 }; | |
| 746 static int coarsenings = 0; | |
| 747 static int occ_sum = 0; | |
| 748 #endif | |
| 749 | |
| 750 jint OtherRegionsTable::_n_coarsenings = 0; | |
| 751 | |
| 752 PosParPRT* OtherRegionsTable::delete_region_table() { | |
| 753 #if DRT_CENSUS | |
| 754 int histo[HistoSize] = { 0, 0, 0, 0, 0, 0 }; | |
| 755 const int histo_limits[] = { 1, 4, 16, 64, 256, 2048 }; | |
| 756 #endif | |
| 757 | |
| 758 assert(_m.owned_by_self(), "Precondition"); | |
| 759 assert(_n_fine_entries == _max_fine_entries, "Precondition"); | |
| 760 PosParPRT* max = NULL; | |
| 761 jint max_occ = 0; | |
| 762 PosParPRT** max_prev; | |
| 763 size_t max_ind; | |
| 764 | |
| 765 #if SAMPLE_FOR_EVICTION | |
| 766 size_t i = _fine_eviction_start; | |
| 767 for (size_t k = 0; k < _fine_eviction_sample_size; k++) { | |
| 768 size_t ii = i; | |
| 769 // Make sure we get a non-NULL sample. | |
| 770 while (_fine_grain_regions[ii] == NULL) { | |
| 771 ii++; | |
| 772 if (ii == _max_fine_entries) ii = 0; | |
| 773 guarantee(ii != i, "We must find one."); | |
| 774 } | |
| 775 PosParPRT** prev = &_fine_grain_regions[ii]; | |
| 776 PosParPRT* cur = *prev; | |
| 777 while (cur != NULL) { | |
| 778 jint cur_occ = cur->occupied(); | |
| 779 if (max == NULL || cur_occ > max_occ) { | |
| 780 max = cur; | |
| 781 max_prev = prev; | |
| 782 max_ind = i; | |
| 783 max_occ = cur_occ; | |
| 784 } | |
| 785 prev = cur->next_addr(); | |
| 786 cur = cur->next(); | |
| 787 } | |
| 788 i = i + _fine_eviction_stride; | |
| 789 if (i >= _n_fine_entries) i = i - _n_fine_entries; | |
| 790 } | |
| 791 _fine_eviction_start++; | |
| 792 if (_fine_eviction_start >= _n_fine_entries) | |
| 793 _fine_eviction_start -= _n_fine_entries; | |
| 794 #else | |
| 795 for (int i = 0; i < _max_fine_entries; i++) { | |
| 796 PosParPRT** prev = &_fine_grain_regions[i]; | |
| 797 PosParPRT* cur = *prev; | |
| 798 while (cur != NULL) { | |
| 799 jint cur_occ = cur->occupied(); | |
| 800 #if DRT_CENSUS | |
| 801 for (int k = 0; k < HistoSize; k++) { | |
| 802 if (cur_occ <= histo_limits[k]) { | |
| 803 histo[k]++; global_histo[k]++; break; | |
| 804 } | |
| 805 } | |
| 806 #endif | |
| 807 if (max == NULL || cur_occ > max_occ) { | |
| 808 max = cur; | |
| 809 max_prev = prev; | |
| 810 max_ind = i; | |
| 811 max_occ = cur_occ; | |
| 812 } | |
| 813 prev = cur->next_addr(); | |
| 814 cur = cur->next(); | |
| 815 } | |
| 816 } | |
| 817 #endif | |
| 818 // XXX | |
| 819 guarantee(max != NULL, "Since _n_fine_entries > 0"); | |
| 820 #if DRT_CENSUS | |
| 821 gclog_or_tty->print_cr("In a coarsening: histo of occs:"); | |
| 822 for (int k = 0; k < HistoSize; k++) { | |
| 823 gclog_or_tty->print_cr(" <= %4d: %5d.", histo_limits[k], histo[k]); | |
| 824 } | |
| 825 coarsenings++; | |
| 826 occ_sum += max_occ; | |
| 827 if ((coarsenings % 100) == 0) { | |
| 828 gclog_or_tty->print_cr("\ncoarsenings = %d; global summary:", coarsenings); | |
| 829 for (int k = 0; k < HistoSize; k++) { | |
| 830 gclog_or_tty->print_cr(" <= %4d: %5d.", histo_limits[k], global_histo[k]); | |
| 831 } | |
| 832 gclog_or_tty->print_cr("Avg occ of deleted region = %6.2f.", | |
| 833 (float)occ_sum/(float)coarsenings); | |
| 834 } | |
| 835 #endif | |
| 836 | |
| 837 // Set the corresponding coarse bit. | |
| 838 int max_hrs_index = max->hr()->hrs_index(); | |
| 839 if (!_coarse_map.at(max_hrs_index)) { | |
| 840 _coarse_map.at_put(max_hrs_index, true); | |
| 841 _n_coarse_entries++; | |
| 842 #if 0 | |
| 843 gclog_or_tty->print("Coarsened entry in region [" PTR_FORMAT "...] " | |
| 844 "for region [" PTR_FORMAT "...] (%d coarse entries).\n", | |
| 845 hr()->bottom(), | |
| 846 max->hr()->bottom(), | |
| 847 _n_coarse_entries); | |
| 848 #endif | |
| 849 } | |
| 850 | |
| 851 // Unsplice. | |
| 852 *max_prev = max->next(); | |
| 853 Atomic::inc(&_n_coarsenings); | |
| 854 _n_fine_entries--; | |
| 855 return max; | |
| 856 } | |
| 857 | |
| 858 | |
| 859 // At present, this must be called stop-world single-threaded. | |
| 860 void OtherRegionsTable::scrub(CardTableModRefBS* ctbs, | |
| 861 BitMap* region_bm, BitMap* card_bm) { | |
| 862 // First eliminated garbage regions from the coarse map. | |
| 863 if (G1RSScrubVerbose) | |
| 864 gclog_or_tty->print_cr("Scrubbing region %d:", hr()->hrs_index()); | |
| 865 | |
| 866 assert(_coarse_map.size() == region_bm->size(), "Precondition"); | |
| 867 if (G1RSScrubVerbose) | |
| 868 gclog_or_tty->print(" Coarse map: before = %d...", _n_coarse_entries); | |
| 869 _coarse_map.set_intersection(*region_bm); | |
| 870 _n_coarse_entries = _coarse_map.count_one_bits(); | |
| 871 if (G1RSScrubVerbose) | |
| 872 gclog_or_tty->print_cr(" after = %d.", _n_coarse_entries); | |
| 873 | |
| 874 // Now do the fine-grained maps. | |
| 875 for (size_t i = 0; i < _max_fine_entries; i++) { | |
| 876 PosParPRT* cur = _fine_grain_regions[i]; | |
| 877 PosParPRT** prev = &_fine_grain_regions[i]; | |
| 878 while (cur != NULL) { | |
| 879 PosParPRT* nxt = cur->next(); | |
| 880 // If the entire region is dead, eliminate. | |
| 881 if (G1RSScrubVerbose) | |
| 882 gclog_or_tty->print_cr(" For other region %d:", cur->hr()->hrs_index()); | |
| 883 if (!region_bm->at(cur->hr()->hrs_index())) { | |
| 884 *prev = nxt; | |
| 885 cur->set_next(NULL); | |
| 886 _n_fine_entries--; | |
| 887 if (G1RSScrubVerbose) | |
| 888 gclog_or_tty->print_cr(" deleted via region map."); | |
| 889 PosParPRT::free(cur); | |
| 890 } else { | |
| 891 // Do fine-grain elimination. | |
| 892 if (G1RSScrubVerbose) | |
| 893 gclog_or_tty->print(" occ: before = %4d.", cur->occupied()); | |
| 894 cur->scrub(ctbs, card_bm); | |
| 895 if (G1RSScrubVerbose) | |
| 896 gclog_or_tty->print_cr(" after = %4d.", cur->occupied()); | |
| 897 // Did that empty the table completely? | |
| 898 if (cur->occupied() == 0) { | |
| 899 *prev = nxt; | |
| 900 cur->set_next(NULL); | |
| 901 _n_fine_entries--; | |
| 902 PosParPRT::free(cur); | |
| 903 } else { | |
| 904 prev = cur->next_addr(); | |
| 905 } | |
| 906 } | |
| 907 cur = nxt; | |
| 908 } | |
| 909 } | |
| 910 // Since we may have deleted a from_card_cache entry from the RS, clear | |
| 911 // the FCC. | |
| 912 clear_fcc(); | |
| 913 } | |
| 914 | |
| 915 | |
| 916 size_t OtherRegionsTable::occupied() const { | |
| 917 // Cast away const in this case. | |
| 918 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
| 919 size_t sum = occ_fine(); | |
| 920 sum += occ_sparse(); | |
| 921 sum += occ_coarse(); | |
| 922 return sum; | |
| 923 } | |
| 924 | |
| 925 size_t OtherRegionsTable::occ_fine() const { | |
| 926 size_t sum = 0; | |
| 927 for (size_t i = 0; i < _max_fine_entries; i++) { | |
| 928 PosParPRT* cur = _fine_grain_regions[i]; | |
| 929 while (cur != NULL) { | |
| 930 sum += cur->occupied(); | |
| 931 cur = cur->next(); | |
| 932 } | |
| 933 } | |
| 934 return sum; | |
| 935 } | |
| 936 | |
| 937 size_t OtherRegionsTable::occ_coarse() const { | |
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938 return (_n_coarse_entries * HeapRegion::CardsPerRegion); |
| 342 | 939 } |
| 940 | |
| 941 size_t OtherRegionsTable::occ_sparse() const { | |
| 942 return _sparse_table.occupied(); | |
| 943 } | |
| 944 | |
| 945 size_t OtherRegionsTable::mem_size() const { | |
| 946 // Cast away const in this case. | |
| 947 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
| 948 size_t sum = 0; | |
| 949 for (size_t i = 0; i < _max_fine_entries; i++) { | |
| 950 PosParPRT* cur = _fine_grain_regions[i]; | |
| 951 while (cur != NULL) { | |
| 952 sum += cur->mem_size(); | |
| 953 cur = cur->next(); | |
| 954 } | |
| 955 } | |
| 956 sum += (sizeof(PosParPRT*) * _max_fine_entries); | |
| 957 sum += (_coarse_map.size_in_words() * HeapWordSize); | |
| 958 sum += (_sparse_table.mem_size()); | |
| 959 sum += sizeof(*this) - sizeof(_sparse_table); // Avoid double counting above. | |
| 960 return sum; | |
| 961 } | |
| 962 | |
| 963 size_t OtherRegionsTable::static_mem_size() { | |
| 964 return _from_card_cache_mem_size; | |
| 965 } | |
| 966 | |
| 967 size_t OtherRegionsTable::fl_mem_size() { | |
| 968 return PerRegionTable::fl_mem_size() + PosParPRT::fl_mem_size(); | |
| 969 } | |
| 970 | |
| 971 void OtherRegionsTable::clear_fcc() { | |
| 972 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
| 973 _from_card_cache[i][hr()->hrs_index()] = -1; | |
| 974 } | |
| 975 } | |
| 976 | |
| 977 void OtherRegionsTable::clear() { | |
| 978 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
| 979 for (size_t i = 0; i < _max_fine_entries; i++) { | |
| 980 PosParPRT* cur = _fine_grain_regions[i]; | |
| 981 while (cur != NULL) { | |
| 982 PosParPRT* nxt = cur->next(); | |
| 983 PosParPRT::free(cur); | |
| 984 cur = nxt; | |
| 985 } | |
| 986 _fine_grain_regions[i] = NULL; | |
| 987 } | |
| 988 _sparse_table.clear(); | |
| 989 _coarse_map.clear(); | |
| 990 _n_fine_entries = 0; | |
| 991 _n_coarse_entries = 0; | |
| 992 | |
| 993 clear_fcc(); | |
| 994 } | |
| 995 | |
| 996 void OtherRegionsTable::clear_incoming_entry(HeapRegion* from_hr) { | |
| 997 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
| 998 size_t hrs_ind = (size_t)from_hr->hrs_index(); | |
| 999 size_t ind = hrs_ind & _mod_max_fine_entries_mask; | |
| 1000 if (del_single_region_table(ind, from_hr)) { | |
| 1001 assert(!_coarse_map.at(hrs_ind), "Inv"); | |
| 1002 } else { | |
| 1003 _coarse_map.par_at_put(hrs_ind, 0); | |
| 1004 } | |
| 1005 // Check to see if any of the fcc entries come from here. | |
| 1006 int hr_ind = hr()->hrs_index(); | |
| 1007 for (int tid = 0; tid < HeapRegionRemSet::num_par_rem_sets(); tid++) { | |
| 1008 int fcc_ent = _from_card_cache[tid][hr_ind]; | |
| 1009 if (fcc_ent != -1) { | |
| 1010 HeapWord* card_addr = (HeapWord*) | |
| 1011 (uintptr_t(fcc_ent) << CardTableModRefBS::card_shift); | |
| 1012 if (hr()->is_in_reserved(card_addr)) { | |
| 1013 // Clear the from card cache. | |
| 1014 _from_card_cache[tid][hr_ind] = -1; | |
| 1015 } | |
| 1016 } | |
| 1017 } | |
| 1018 } | |
| 1019 | |
| 1020 bool OtherRegionsTable::del_single_region_table(size_t ind, | |
| 1021 HeapRegion* hr) { | |
| 1022 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
| 1023 PosParPRT** prev_addr = &_fine_grain_regions[ind]; | |
| 1024 PosParPRT* prt = *prev_addr; | |
| 1025 while (prt != NULL && prt->hr() != hr) { | |
| 1026 prev_addr = prt->next_addr(); | |
| 1027 prt = prt->next(); | |
| 1028 } | |
| 1029 if (prt != NULL) { | |
| 1030 assert(prt->hr() == hr, "Loop postcondition."); | |
| 1031 *prev_addr = prt->next(); | |
| 1032 PosParPRT::free(prt); | |
| 1033 _n_fine_entries--; | |
| 1034 return true; | |
| 1035 } else { | |
| 1036 return false; | |
| 1037 } | |
| 1038 } | |
| 1039 | |
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1040 bool OtherRegionsTable::contains_reference(OopOrNarrowOopStar from) const { |
| 342 | 1041 // Cast away const in this case. |
| 1042 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
| 1043 return contains_reference_locked(from); | |
| 1044 } | |
| 1045 | |
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1046 bool OtherRegionsTable::contains_reference_locked(OopOrNarrowOopStar from) const { |
| 342 | 1047 HeapRegion* hr = _g1h->heap_region_containing_raw(from); |
| 1048 if (hr == NULL) return false; | |
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1049 RegionIdx_t hr_ind = (RegionIdx_t) hr->hrs_index(); |
| 342 | 1050 // Is this region in the coarse map? |
| 1051 if (_coarse_map.at(hr_ind)) return true; | |
| 1052 | |
| 1053 PosParPRT* prt = find_region_table(hr_ind & _mod_max_fine_entries_mask, | |
| 1054 hr); | |
| 1055 if (prt != NULL) { | |
| 1056 return prt->contains_reference(from); | |
| 1057 | |
| 1058 } else { | |
| 1059 uintptr_t from_card = | |
| 1060 (uintptr_t(from) >> CardTableModRefBS::card_shift); | |
| 1061 uintptr_t hr_bot_card_index = | |
| 1062 uintptr_t(hr->bottom()) >> CardTableModRefBS::card_shift; | |
| 1063 assert(from_card >= hr_bot_card_index, "Inv"); | |
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1064 CardIdx_t card_index = from_card - hr_bot_card_index; |
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1065 assert(0 <= card_index && card_index < HeapRegion::CardsPerRegion, |
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1066 "Must be in range."); |
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1067 return _sparse_table.contains_card(hr_ind, card_index); |
| 342 | 1068 } |
| 1069 | |
| 1070 | |
| 1071 } | |
| 1072 | |
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1073 // Determines how many threads can add records to an rset in parallel. |
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1074 // This can be done by either mutator threads together with the |
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1075 // concurrent refinement threads or GC threads. |
| 342 | 1076 int HeapRegionRemSet::num_par_rem_sets() { |
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1077 return (int)MAX2(DirtyCardQueueSet::num_par_ids() + ConcurrentG1Refine::thread_num(), ParallelGCThreads); |
| 342 | 1078 } |
| 1079 | |
| 1080 HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, | |
| 1081 HeapRegion* hr) | |
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1082 : _bosa(bosa), _other_regions(hr), _iter_state(Unclaimed) { } |
| 342 | 1083 |
| 1084 | |
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1085 void HeapRegionRemSet::setup_remset_size() { |
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1086 // Setup sparse and fine-grain tables sizes. |
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1087 // table_size = base * (log(region_size / 1M) + 1) |
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1088 int region_size_log_mb = MAX2((int)HeapRegion::LogOfHRGrainBytes - (int)LOG_M, 0); |
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1089 if (FLAG_IS_DEFAULT(G1RSetSparseRegionEntries)) { |
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1090 G1RSetSparseRegionEntries = G1RSetSparseRegionEntriesBase * (region_size_log_mb + 1); |
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1091 } |
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1092 if (FLAG_IS_DEFAULT(G1RSetRegionEntries)) { |
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1093 G1RSetRegionEntries = G1RSetRegionEntriesBase * (region_size_log_mb + 1); |
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1094 } |
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1095 guarantee(G1RSetSparseRegionEntries > 0 && G1RSetRegionEntries > 0 , "Sanity"); |
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1096 } |
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1097 |
| 342 | 1098 void HeapRegionRemSet::init_for_par_iteration() { |
| 1099 _iter_state = Unclaimed; | |
| 1100 } | |
| 1101 | |
| 1102 bool HeapRegionRemSet::claim_iter() { | |
| 1103 if (_iter_state != Unclaimed) return false; | |
| 1104 jint res = Atomic::cmpxchg(Claimed, (jint*)(&_iter_state), Unclaimed); | |
| 1105 return (res == Unclaimed); | |
| 1106 } | |
| 1107 | |
| 1108 void HeapRegionRemSet::set_iter_complete() { | |
| 1109 _iter_state = Complete; | |
| 1110 } | |
| 1111 | |
| 1112 bool HeapRegionRemSet::iter_is_complete() { | |
| 1113 return _iter_state == Complete; | |
| 1114 } | |
| 1115 | |
| 1116 | |
| 1117 void HeapRegionRemSet::init_iterator(HeapRegionRemSetIterator* iter) const { | |
| 1118 iter->initialize(this); | |
| 1119 } | |
| 1120 | |
| 1121 #ifndef PRODUCT | |
| 1122 void HeapRegionRemSet::print() const { | |
| 1123 HeapRegionRemSetIterator iter; | |
| 1124 init_iterator(&iter); | |
| 1125 size_t card_index; | |
| 1126 while (iter.has_next(card_index)) { | |
| 1127 HeapWord* card_start = | |
| 1128 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
| 1129 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); | |
| 1130 } | |
| 1131 // XXX | |
| 1132 if (iter.n_yielded() != occupied()) { | |
| 1133 gclog_or_tty->print_cr("Yielded disagrees with occupied:"); | |
| 1134 gclog_or_tty->print_cr(" %6d yielded (%6d coarse, %6d fine).", | |
| 1135 iter.n_yielded(), | |
| 1136 iter.n_yielded_coarse(), iter.n_yielded_fine()); | |
| 1137 gclog_or_tty->print_cr(" %6d occ (%6d coarse, %6d fine).", | |
| 1138 occupied(), occ_coarse(), occ_fine()); | |
| 1139 } | |
| 1140 guarantee(iter.n_yielded() == occupied(), | |
| 1141 "We should have yielded all the represented cards."); | |
| 1142 } | |
| 1143 #endif | |
| 1144 | |
| 1145 void HeapRegionRemSet::cleanup() { | |
| 1146 SparsePRT::cleanup_all(); | |
| 1147 } | |
| 1148 | |
| 1149 void HeapRegionRemSet::par_cleanup() { | |
| 1150 PosParPRT::par_contract_all(); | |
| 1151 } | |
| 1152 | |
| 1153 void HeapRegionRemSet::clear() { | |
| 1154 _other_regions.clear(); | |
| 1155 assert(occupied() == 0, "Should be clear."); | |
| 1156 } | |
| 1157 | |
| 1158 void HeapRegionRemSet::scrub(CardTableModRefBS* ctbs, | |
| 1159 BitMap* region_bm, BitMap* card_bm) { | |
| 1160 _other_regions.scrub(ctbs, region_bm, card_bm); | |
| 1161 } | |
| 1162 | |
| 1163 //-------------------- Iteration -------------------- | |
| 1164 | |
| 1165 HeapRegionRemSetIterator:: | |
| 1166 HeapRegionRemSetIterator() : | |
| 1167 _hrrs(NULL), | |
| 1168 _g1h(G1CollectedHeap::heap()), | |
| 1169 _bosa(NULL), | |
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1170 _sparse_iter() { } |
| 342 | 1171 |
| 1172 void HeapRegionRemSetIterator::initialize(const HeapRegionRemSet* hrrs) { | |
| 1173 _hrrs = hrrs; | |
| 1174 _coarse_map = &_hrrs->_other_regions._coarse_map; | |
| 1175 _fine_grain_regions = _hrrs->_other_regions._fine_grain_regions; | |
| 1176 _bosa = _hrrs->bosa(); | |
| 1177 | |
| 1178 _is = Sparse; | |
| 1179 // Set these values so that we increment to the first region. | |
| 1180 _coarse_cur_region_index = -1; | |
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1181 _coarse_cur_region_cur_card = (HeapRegion::CardsPerRegion-1);; |
| 342 | 1182 |
| 1183 _cur_region_cur_card = 0; | |
| 1184 | |
| 1185 _fine_array_index = -1; | |
| 1186 _fine_cur_prt = NULL; | |
| 1187 | |
| 1188 _n_yielded_coarse = 0; | |
| 1189 _n_yielded_fine = 0; | |
| 1190 _n_yielded_sparse = 0; | |
| 1191 | |
| 1192 _sparse_iter.init(&hrrs->_other_regions._sparse_table); | |
| 1193 } | |
| 1194 | |
| 1195 bool HeapRegionRemSetIterator::coarse_has_next(size_t& card_index) { | |
| 1196 if (_hrrs->_other_regions._n_coarse_entries == 0) return false; | |
| 1197 // Go to the next card. | |
| 1198 _coarse_cur_region_cur_card++; | |
| 1199 // Was the last the last card in the current region? | |
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1200 if (_coarse_cur_region_cur_card == HeapRegion::CardsPerRegion) { |
| 342 | 1201 // Yes: find the next region. This may leave _coarse_cur_region_index |
| 1202 // Set to the last index, in which case there are no more coarse | |
| 1203 // regions. | |
| 1204 _coarse_cur_region_index = | |
| 1205 (int) _coarse_map->get_next_one_offset(_coarse_cur_region_index + 1); | |
| 1206 if ((size_t)_coarse_cur_region_index < _coarse_map->size()) { | |
| 1207 _coarse_cur_region_cur_card = 0; | |
| 1208 HeapWord* r_bot = | |
| 1209 _g1h->region_at(_coarse_cur_region_index)->bottom(); | |
| 1210 _cur_region_card_offset = _bosa->index_for(r_bot); | |
| 1211 } else { | |
| 1212 return false; | |
| 1213 } | |
| 1214 } | |
| 1215 // If we didn't return false above, then we can yield a card. | |
| 1216 card_index = _cur_region_card_offset + _coarse_cur_region_cur_card; | |
| 1217 return true; | |
| 1218 } | |
| 1219 | |
| 1220 void HeapRegionRemSetIterator::fine_find_next_non_null_prt() { | |
| 1221 // Otherwise, find the next bucket list in the array. | |
| 1222 _fine_array_index++; | |
| 1223 while (_fine_array_index < (int) OtherRegionsTable::_max_fine_entries) { | |
| 1224 _fine_cur_prt = _fine_grain_regions[_fine_array_index]; | |
| 1225 if (_fine_cur_prt != NULL) return; | |
| 1226 else _fine_array_index++; | |
| 1227 } | |
| 1228 assert(_fine_cur_prt == NULL, "Loop post"); | |
| 1229 } | |
| 1230 | |
| 1231 bool HeapRegionRemSetIterator::fine_has_next(size_t& card_index) { | |
| 1232 if (fine_has_next()) { | |
| 1233 _cur_region_cur_card = | |
| 1234 _fine_cur_prt->_bm.get_next_one_offset(_cur_region_cur_card + 1); | |
| 1235 } | |
| 1236 while (!fine_has_next()) { | |
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1237 if (_cur_region_cur_card == (size_t) HeapRegion::CardsPerRegion) { |
| 342 | 1238 _cur_region_cur_card = 0; |
| 1239 _fine_cur_prt = _fine_cur_prt->next(); | |
| 1240 } | |
| 1241 if (_fine_cur_prt == NULL) { | |
| 1242 fine_find_next_non_null_prt(); | |
| 1243 if (_fine_cur_prt == NULL) return false; | |
| 1244 } | |
| 1245 assert(_fine_cur_prt != NULL && _cur_region_cur_card == 0, | |
| 1246 "inv."); | |
| 1247 HeapWord* r_bot = | |
| 1248 _fine_cur_prt->hr()->bottom(); | |
| 1249 _cur_region_card_offset = _bosa->index_for(r_bot); | |
| 1250 _cur_region_cur_card = _fine_cur_prt->_bm.get_next_one_offset(0); | |
| 1251 } | |
| 1252 assert(fine_has_next(), "Or else we exited the loop via the return."); | |
| 1253 card_index = _cur_region_card_offset + _cur_region_cur_card; | |
| 1254 return true; | |
| 1255 } | |
| 1256 | |
| 1257 bool HeapRegionRemSetIterator::fine_has_next() { | |
| 1258 return | |
| 1259 _fine_cur_prt != NULL && | |
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1260 _cur_region_cur_card < (size_t) HeapRegion::CardsPerRegion; |
| 342 | 1261 } |
| 1262 | |
| 1263 bool HeapRegionRemSetIterator::has_next(size_t& card_index) { | |
| 1264 switch (_is) { | |
| 1265 case Sparse: | |
| 1266 if (_sparse_iter.has_next(card_index)) { | |
| 1267 _n_yielded_sparse++; | |
| 1268 return true; | |
| 1269 } | |
| 1270 // Otherwise, deliberate fall-through | |
| 1271 _is = Fine; | |
| 1272 case Fine: | |
| 1273 if (fine_has_next(card_index)) { | |
| 1274 _n_yielded_fine++; | |
| 1275 return true; | |
| 1276 } | |
| 1277 // Otherwise, deliberate fall-through | |
| 1278 _is = Coarse; | |
| 1279 case Coarse: | |
| 1280 if (coarse_has_next(card_index)) { | |
| 1281 _n_yielded_coarse++; | |
| 1282 return true; | |
| 1283 } | |
| 1284 // Otherwise... | |
| 1285 break; | |
| 1286 } | |
| 1287 assert(ParallelGCThreads > 1 || | |
| 1288 n_yielded() == _hrrs->occupied(), | |
| 1289 "Should have yielded all the cards in the rem set " | |
| 1290 "(in the non-par case)."); | |
| 1291 return false; | |
| 1292 } | |
| 1293 | |
| 1294 | |
| 1295 | |
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1296 OopOrNarrowOopStar* HeapRegionRemSet::_recorded_oops = NULL; |
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1297 HeapWord** HeapRegionRemSet::_recorded_cards = NULL; |
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1298 HeapRegion** HeapRegionRemSet::_recorded_regions = NULL; |
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1299 int HeapRegionRemSet::_n_recorded = 0; |
| 342 | 1300 |
| 1301 HeapRegionRemSet::Event* HeapRegionRemSet::_recorded_events = NULL; | |
| 1302 int* HeapRegionRemSet::_recorded_event_index = NULL; | |
| 1303 int HeapRegionRemSet::_n_recorded_events = 0; | |
| 1304 | |
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1305 void HeapRegionRemSet::record(HeapRegion* hr, OopOrNarrowOopStar f) { |
| 342 | 1306 if (_recorded_oops == NULL) { |
| 1307 assert(_n_recorded == 0 | |
| 1308 && _recorded_cards == NULL | |
| 1309 && _recorded_regions == NULL, | |
| 1310 "Inv"); | |
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1311 _recorded_oops = NEW_C_HEAP_ARRAY(OopOrNarrowOopStar, MaxRecorded); |
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1312 _recorded_cards = NEW_C_HEAP_ARRAY(HeapWord*, MaxRecorded); |
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1313 _recorded_regions = NEW_C_HEAP_ARRAY(HeapRegion*, MaxRecorded); |
| 342 | 1314 } |
| 1315 if (_n_recorded == MaxRecorded) { | |
| 1316 gclog_or_tty->print_cr("Filled up 'recorded' (%d).", MaxRecorded); | |
| 1317 } else { | |
| 1318 _recorded_cards[_n_recorded] = | |
| 1319 (HeapWord*)align_size_down(uintptr_t(f), | |
| 1320 CardTableModRefBS::card_size); | |
| 1321 _recorded_oops[_n_recorded] = f; | |
| 1322 _recorded_regions[_n_recorded] = hr; | |
| 1323 _n_recorded++; | |
| 1324 } | |
| 1325 } | |
| 1326 | |
| 1327 void HeapRegionRemSet::record_event(Event evnt) { | |
| 1328 if (!G1RecordHRRSEvents) return; | |
| 1329 | |
| 1330 if (_recorded_events == NULL) { | |
| 1331 assert(_n_recorded_events == 0 | |
| 1332 && _recorded_event_index == NULL, | |
| 1333 "Inv"); | |
| 1334 _recorded_events = NEW_C_HEAP_ARRAY(Event, MaxRecordedEvents); | |
| 1335 _recorded_event_index = NEW_C_HEAP_ARRAY(int, MaxRecordedEvents); | |
| 1336 } | |
| 1337 if (_n_recorded_events == MaxRecordedEvents) { | |
| 1338 gclog_or_tty->print_cr("Filled up 'recorded_events' (%d).", MaxRecordedEvents); | |
| 1339 } else { | |
| 1340 _recorded_events[_n_recorded_events] = evnt; | |
| 1341 _recorded_event_index[_n_recorded_events] = _n_recorded; | |
| 1342 _n_recorded_events++; | |
| 1343 } | |
| 1344 } | |
| 1345 | |
| 1346 void HeapRegionRemSet::print_event(outputStream* str, Event evnt) { | |
| 1347 switch (evnt) { | |
| 1348 case Event_EvacStart: | |
| 1349 str->print("Evac Start"); | |
| 1350 break; | |
| 1351 case Event_EvacEnd: | |
| 1352 str->print("Evac End"); | |
| 1353 break; | |
| 1354 case Event_RSUpdateEnd: | |
| 1355 str->print("RS Update End"); | |
| 1356 break; | |
| 1357 } | |
| 1358 } | |
| 1359 | |
| 1360 void HeapRegionRemSet::print_recorded() { | |
| 1361 int cur_evnt = 0; | |
| 1362 Event cur_evnt_kind; | |
| 1363 int cur_evnt_ind = 0; | |
| 1364 if (_n_recorded_events > 0) { | |
| 1365 cur_evnt_kind = _recorded_events[cur_evnt]; | |
| 1366 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
| 1367 } | |
| 1368 | |
| 1369 for (int i = 0; i < _n_recorded; i++) { | |
| 1370 while (cur_evnt < _n_recorded_events && i == cur_evnt_ind) { | |
| 1371 gclog_or_tty->print("Event: "); | |
| 1372 print_event(gclog_or_tty, cur_evnt_kind); | |
| 1373 gclog_or_tty->print_cr(""); | |
| 1374 cur_evnt++; | |
| 1375 if (cur_evnt < MaxRecordedEvents) { | |
| 1376 cur_evnt_kind = _recorded_events[cur_evnt]; | |
| 1377 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
| 1378 } | |
| 1379 } | |
| 1380 gclog_or_tty->print("Added card " PTR_FORMAT " to region [" PTR_FORMAT "...]" | |
| 1381 " for ref " PTR_FORMAT ".\n", | |
| 1382 _recorded_cards[i], _recorded_regions[i]->bottom(), | |
| 1383 _recorded_oops[i]); | |
| 1384 } | |
| 1385 } | |
| 1386 | |
| 1387 #ifndef PRODUCT | |
| 1388 void HeapRegionRemSet::test() { | |
| 1389 os::sleep(Thread::current(), (jlong)5000, false); | |
| 1390 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1391 | |
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1392 // Run with "-XX:G1LogRSetRegionEntries=2", so that 1 and 5 end up in same |
| 342 | 1393 // hash bucket. |
| 1394 HeapRegion* hr0 = g1h->region_at(0); | |
| 1395 HeapRegion* hr1 = g1h->region_at(1); | |
| 1396 HeapRegion* hr2 = g1h->region_at(5); | |
| 1397 HeapRegion* hr3 = g1h->region_at(6); | |
| 1398 HeapRegion* hr4 = g1h->region_at(7); | |
| 1399 HeapRegion* hr5 = g1h->region_at(8); | |
| 1400 | |
| 1401 HeapWord* hr1_start = hr1->bottom(); | |
| 1402 HeapWord* hr1_mid = hr1_start + HeapRegion::GrainWords/2; | |
| 1403 HeapWord* hr1_last = hr1->end() - 1; | |
| 1404 | |
| 1405 HeapWord* hr2_start = hr2->bottom(); | |
| 1406 HeapWord* hr2_mid = hr2_start + HeapRegion::GrainWords/2; | |
| 1407 HeapWord* hr2_last = hr2->end() - 1; | |
| 1408 | |
| 1409 HeapWord* hr3_start = hr3->bottom(); | |
| 1410 HeapWord* hr3_mid = hr3_start + HeapRegion::GrainWords/2; | |
| 1411 HeapWord* hr3_last = hr3->end() - 1; | |
| 1412 | |
| 1413 HeapRegionRemSet* hrrs = hr0->rem_set(); | |
| 1414 | |
| 1415 // Make three references from region 0x101... | |
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1416 hrrs->add_reference((OopOrNarrowOopStar)hr1_start); |
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1417 hrrs->add_reference((OopOrNarrowOopStar)hr1_mid); |
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1418 hrrs->add_reference((OopOrNarrowOopStar)hr1_last); |
| 342 | 1419 |
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1420 hrrs->add_reference((OopOrNarrowOopStar)hr2_start); |
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1421 hrrs->add_reference((OopOrNarrowOopStar)hr2_mid); |
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1422 hrrs->add_reference((OopOrNarrowOopStar)hr2_last); |
| 342 | 1423 |
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1424 hrrs->add_reference((OopOrNarrowOopStar)hr3_start); |
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1425 hrrs->add_reference((OopOrNarrowOopStar)hr3_mid); |
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1426 hrrs->add_reference((OopOrNarrowOopStar)hr3_last); |
| 342 | 1427 |
| 1428 // Now cause a coarsening. | |
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1429 hrrs->add_reference((OopOrNarrowOopStar)hr4->bottom()); |
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1430 hrrs->add_reference((OopOrNarrowOopStar)hr5->bottom()); |
| 342 | 1431 |
| 1432 // Now, does iteration yield these three? | |
| 1433 HeapRegionRemSetIterator iter; | |
| 1434 hrrs->init_iterator(&iter); | |
| 1435 size_t sum = 0; | |
| 1436 size_t card_index; | |
| 1437 while (iter.has_next(card_index)) { | |
| 1438 HeapWord* card_start = | |
| 1439 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
| 1440 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); | |
| 1441 sum++; | |
| 1442 } | |
| 1443 guarantee(sum == 11 - 3 + 2048, "Failure"); | |
| 1444 guarantee(sum == hrrs->occupied(), "Failure"); | |
| 1445 } | |
| 1446 #endif |