Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp @ 1259:9eee977dd1a9
6802453: G1: hr()->is_in_reserved(from),"Precondition."
Summary: The operations of re-using a RSet component and expanding the same RSet component were not mutually exlusive, and this could lead to RSets getting corrupted and entries being dropped.
Reviewed-by: iveresov, johnc
| author | tonyp |
|---|---|
| date | Mon, 08 Feb 2010 14:23:01 -0500 |
| parents | 2c79770d1f6e |
| children | 0414c1049f15 |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 579 | 2 * Copyright 2001-2009 Sun Microsystems, Inc. All Rights Reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_heapRegionRemSet.cpp.incl" | |
| 27 | |
| 28 #define HRRS_VERBOSE 0 | |
| 29 | |
| 30 #define PRT_COUNT_OCCUPIED 1 | |
| 31 | |
| 32 // OtherRegionsTable | |
| 33 | |
| 34 class PerRegionTable: public CHeapObj { | |
| 35 friend class OtherRegionsTable; | |
| 36 friend class HeapRegionRemSetIterator; | |
| 37 | |
| 38 HeapRegion* _hr; | |
| 39 BitMap _bm; | |
| 40 #if PRT_COUNT_OCCUPIED | |
| 41 jint _occupied; | |
| 42 #endif | |
| 43 PerRegionTable* _next_free; | |
| 44 | |
| 45 PerRegionTable* next_free() { return _next_free; } | |
| 46 void set_next_free(PerRegionTable* prt) { _next_free = prt; } | |
| 47 | |
| 48 | |
| 49 static PerRegionTable* _free_list; | |
| 50 | |
| 51 #ifdef _MSC_VER | |
| 52 // For some reason even though the classes are marked as friend they are unable | |
| 53 // to access CardsPerRegion when private/protected. Only the windows c++ compiler | |
| 54 // says this Sun CC and linux gcc don't have a problem with access when private | |
| 55 | |
| 56 public: | |
| 57 | |
| 58 #endif // _MSC_VER | |
| 59 | |
| 60 protected: | |
| 61 // We need access in order to union things into the base table. | |
| 62 BitMap* bm() { return &_bm; } | |
| 63 | |
| 545 | 64 #if PRT_COUNT_OCCUPIED |
| 342 | 65 void recount_occupied() { |
| 66 _occupied = (jint) bm()->count_one_bits(); | |
| 67 } | |
| 545 | 68 #endif |
| 342 | 69 |
| 70 PerRegionTable(HeapRegion* hr) : | |
| 71 _hr(hr), | |
| 72 #if PRT_COUNT_OCCUPIED | |
| 73 _occupied(0), | |
| 74 #endif | |
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75 _bm(HeapRegion::CardsPerRegion, false /* in-resource-area */) |
| 342 | 76 {} |
| 77 | |
| 78 static void free(PerRegionTable* prt) { | |
| 79 while (true) { | |
| 80 PerRegionTable* fl = _free_list; | |
| 81 prt->set_next_free(fl); | |
| 82 PerRegionTable* res = | |
| 83 (PerRegionTable*) | |
| 84 Atomic::cmpxchg_ptr(prt, &_free_list, fl); | |
| 85 if (res == fl) return; | |
| 86 } | |
| 87 ShouldNotReachHere(); | |
| 88 } | |
| 89 | |
| 90 static PerRegionTable* alloc(HeapRegion* hr) { | |
| 91 PerRegionTable* fl = _free_list; | |
| 92 while (fl != NULL) { | |
| 93 PerRegionTable* nxt = fl->next_free(); | |
| 94 PerRegionTable* res = | |
| 95 (PerRegionTable*) | |
| 96 Atomic::cmpxchg_ptr(nxt, &_free_list, fl); | |
| 97 if (res == fl) { | |
| 98 fl->init(hr); | |
| 99 return fl; | |
| 100 } else { | |
| 101 fl = _free_list; | |
| 102 } | |
| 103 } | |
| 104 assert(fl == NULL, "Loop condition."); | |
| 105 return new PerRegionTable(hr); | |
| 106 } | |
| 107 | |
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108 void add_card_work(CardIdx_t from_card, bool par) { |
| 342 | 109 if (!_bm.at(from_card)) { |
| 110 if (par) { | |
| 111 if (_bm.par_at_put(from_card, 1)) { | |
| 112 #if PRT_COUNT_OCCUPIED | |
| 113 Atomic::inc(&_occupied); | |
| 114 #endif | |
| 115 } | |
| 116 } else { | |
| 117 _bm.at_put(from_card, 1); | |
| 118 #if PRT_COUNT_OCCUPIED | |
| 119 _occupied++; | |
| 120 #endif | |
| 121 } | |
| 122 } | |
| 123 } | |
| 124 | |
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125 void add_reference_work(OopOrNarrowOopStar from, bool par) { |
| 342 | 126 // Must make this robust in case "from" is not in "_hr", because of |
| 127 // concurrency. | |
| 128 | |
| 129 #if HRRS_VERBOSE | |
| 130 gclog_or_tty->print_cr(" PRT::Add_reference_work(" PTR_FORMAT "->" PTR_FORMAT").", | |
| 131 from, *from); | |
| 132 #endif | |
| 133 | |
| 134 HeapRegion* loc_hr = hr(); | |
| 135 // If the test below fails, then this table was reused concurrently | |
| 136 // with this operation. This is OK, since the old table was coarsened, | |
| 137 // and adding a bit to the new table is never incorrect. | |
| 138 if (loc_hr->is_in_reserved(from)) { | |
| 139 size_t hw_offset = pointer_delta((HeapWord*)from, loc_hr->bottom()); | |
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140 CardIdx_t from_card = (CardIdx_t) |
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141 hw_offset >> (CardTableModRefBS::card_shift - LogHeapWordSize); |
| 342 | 142 |
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143 assert(0 <= from_card && from_card < HeapRegion::CardsPerRegion, |
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144 "Must be in range."); |
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145 add_card_work(from_card, par); |
| 342 | 146 } |
| 147 } | |
| 148 | |
| 149 public: | |
| 150 | |
| 151 HeapRegion* hr() const { return _hr; } | |
| 152 | |
| 153 #if PRT_COUNT_OCCUPIED | |
| 154 jint occupied() const { | |
| 155 // Overkill, but if we ever need it... | |
| 156 // guarantee(_occupied == _bm.count_one_bits(), "Check"); | |
| 157 return _occupied; | |
| 158 } | |
| 159 #else | |
| 160 jint occupied() const { | |
| 161 return _bm.count_one_bits(); | |
| 162 } | |
| 163 #endif | |
| 164 | |
| 165 void init(HeapRegion* hr) { | |
| 166 _hr = hr; | |
| 167 #if PRT_COUNT_OCCUPIED | |
| 168 _occupied = 0; | |
| 169 #endif | |
| 170 _bm.clear(); | |
| 171 } | |
| 172 | |
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173 void add_reference(OopOrNarrowOopStar from) { |
| 342 | 174 add_reference_work(from, /*parallel*/ true); |
| 175 } | |
| 176 | |
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177 void seq_add_reference(OopOrNarrowOopStar from) { |
| 342 | 178 add_reference_work(from, /*parallel*/ false); |
| 179 } | |
| 180 | |
| 181 void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { | |
| 182 HeapWord* hr_bot = hr()->bottom(); | |
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183 size_t hr_first_card_index = ctbs->index_for(hr_bot); |
| 342 | 184 bm()->set_intersection_at_offset(*card_bm, hr_first_card_index); |
| 185 #if PRT_COUNT_OCCUPIED | |
| 186 recount_occupied(); | |
| 187 #endif | |
| 188 } | |
| 189 | |
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190 void add_card(CardIdx_t from_card_index) { |
| 342 | 191 add_card_work(from_card_index, /*parallel*/ true); |
| 192 } | |
| 193 | |
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194 void seq_add_card(CardIdx_t from_card_index) { |
| 342 | 195 add_card_work(from_card_index, /*parallel*/ false); |
| 196 } | |
| 197 | |
| 198 // (Destructively) union the bitmap of the current table into the given | |
| 199 // bitmap (which is assumed to be of the same size.) | |
| 200 void union_bitmap_into(BitMap* bm) { | |
| 201 bm->set_union(_bm); | |
| 202 } | |
| 203 | |
| 204 // Mem size in bytes. | |
| 205 size_t mem_size() const { | |
| 206 return sizeof(this) + _bm.size_in_words() * HeapWordSize; | |
| 207 } | |
| 208 | |
| 209 static size_t fl_mem_size() { | |
| 210 PerRegionTable* cur = _free_list; | |
| 211 size_t res = 0; | |
| 212 while (cur != NULL) { | |
| 213 res += sizeof(PerRegionTable); | |
| 214 cur = cur->next_free(); | |
| 215 } | |
| 216 return res; | |
| 217 } | |
| 218 | |
| 219 // Requires "from" to be in "hr()". | |
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220 bool contains_reference(OopOrNarrowOopStar from) const { |
| 342 | 221 assert(hr()->is_in_reserved(from), "Precondition."); |
| 222 size_t card_ind = pointer_delta(from, hr()->bottom(), | |
| 223 CardTableModRefBS::card_size); | |
| 224 return _bm.at(card_ind); | |
| 225 } | |
| 226 }; | |
| 227 | |
| 228 PerRegionTable* PerRegionTable::_free_list = NULL; | |
| 229 | |
| 230 | |
| 231 #define COUNT_PAR_EXPANDS 0 | |
| 232 | |
| 233 #if COUNT_PAR_EXPANDS | |
| 234 static jint n_par_expands = 0; | |
| 235 static jint n_par_contracts = 0; | |
| 236 static jint par_expand_list_len = 0; | |
| 237 static jint max_par_expand_list_len = 0; | |
| 238 | |
| 239 static void print_par_expand() { | |
| 240 Atomic::inc(&n_par_expands); | |
| 241 Atomic::inc(&par_expand_list_len); | |
| 242 if (par_expand_list_len > max_par_expand_list_len) { | |
| 243 max_par_expand_list_len = par_expand_list_len; | |
| 244 } | |
| 245 if ((n_par_expands % 10) == 0) { | |
| 246 gclog_or_tty->print_cr("\n\n%d par expands: %d contracts, " | |
| 247 "len = %d, max_len = %d\n.", | |
| 248 n_par_expands, n_par_contracts, par_expand_list_len, | |
| 249 max_par_expand_list_len); | |
| 250 } | |
| 251 } | |
| 252 #endif | |
| 253 | |
| 254 class PosParPRT: public PerRegionTable { | |
| 255 PerRegionTable** _par_tables; | |
| 256 | |
| 257 enum SomePrivateConstants { | |
| 258 ReserveParTableExpansion = 1 | |
| 259 }; | |
| 260 | |
| 261 void par_contract() { | |
| 262 assert(_par_tables != NULL, "Precondition."); | |
| 263 int n = HeapRegionRemSet::num_par_rem_sets()-1; | |
| 264 for (int i = 0; i < n; i++) { | |
| 265 _par_tables[i]->union_bitmap_into(bm()); | |
| 266 PerRegionTable::free(_par_tables[i]); | |
| 267 _par_tables[i] = NULL; | |
| 268 } | |
| 269 #if PRT_COUNT_OCCUPIED | |
| 270 // We must recount the "occupied." | |
| 271 recount_occupied(); | |
| 272 #endif | |
| 273 FREE_C_HEAP_ARRAY(PerRegionTable*, _par_tables); | |
| 274 _par_tables = NULL; | |
| 275 #if COUNT_PAR_EXPANDS | |
| 276 Atomic::inc(&n_par_contracts); | |
| 277 Atomic::dec(&par_expand_list_len); | |
| 278 #endif | |
| 279 } | |
| 280 | |
| 281 static PerRegionTable** _par_table_fl; | |
| 282 | |
| 283 PosParPRT* _next; | |
| 284 | |
| 285 static PosParPRT* _free_list; | |
| 286 | |
| 287 PerRegionTable** par_tables() const { | |
| 288 assert(uintptr_t(NULL) == 0, "Assumption."); | |
| 289 if (uintptr_t(_par_tables) <= ReserveParTableExpansion) | |
| 290 return NULL; | |
| 291 else | |
| 292 return _par_tables; | |
| 293 } | |
| 294 | |
| 295 PosParPRT* _next_par_expanded; | |
| 296 PosParPRT* next_par_expanded() { return _next_par_expanded; } | |
| 297 void set_next_par_expanded(PosParPRT* ppprt) { _next_par_expanded = ppprt; } | |
| 298 static PosParPRT* _par_expanded_list; | |
| 299 | |
| 300 public: | |
| 301 | |
| 302 PosParPRT(HeapRegion* hr) : PerRegionTable(hr), _par_tables(NULL) {} | |
| 303 | |
| 304 jint occupied() const { | |
| 305 jint res = PerRegionTable::occupied(); | |
| 306 if (par_tables() != NULL) { | |
| 307 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { | |
| 308 res += par_tables()[i]->occupied(); | |
| 309 } | |
| 310 } | |
| 311 return res; | |
| 312 } | |
| 313 | |
| 314 void init(HeapRegion* hr) { | |
| 315 PerRegionTable::init(hr); | |
| 316 _next = NULL; | |
| 317 if (par_tables() != NULL) { | |
| 318 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { | |
| 319 par_tables()[i]->init(hr); | |
| 320 } | |
| 321 } | |
| 322 } | |
| 323 | |
| 324 static void free(PosParPRT* prt) { | |
| 325 while (true) { | |
| 326 PosParPRT* fl = _free_list; | |
| 327 prt->set_next(fl); | |
| 328 PosParPRT* res = | |
| 329 (PosParPRT*) | |
| 330 Atomic::cmpxchg_ptr(prt, &_free_list, fl); | |
| 331 if (res == fl) return; | |
| 332 } | |
| 333 ShouldNotReachHere(); | |
| 334 } | |
| 335 | |
| 336 static PosParPRT* alloc(HeapRegion* hr) { | |
| 337 PosParPRT* fl = _free_list; | |
| 338 while (fl != NULL) { | |
| 339 PosParPRT* nxt = fl->next(); | |
| 340 PosParPRT* res = | |
| 341 (PosParPRT*) | |
| 342 Atomic::cmpxchg_ptr(nxt, &_free_list, fl); | |
| 343 if (res == fl) { | |
| 344 fl->init(hr); | |
| 345 return fl; | |
| 346 } else { | |
| 347 fl = _free_list; | |
| 348 } | |
| 349 } | |
| 350 assert(fl == NULL, "Loop condition."); | |
| 351 return new PosParPRT(hr); | |
| 352 } | |
| 353 | |
| 354 PosParPRT* next() const { return _next; } | |
| 355 void set_next(PosParPRT* nxt) { _next = nxt; } | |
| 356 PosParPRT** next_addr() { return &_next; } | |
| 357 | |
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358 bool should_expand(int tid) { |
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359 return par_tables() == NULL && tid > 0 && hr()->is_gc_alloc_region(); |
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360 } |
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361 |
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362 void par_expand() { |
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363 int n = HeapRegionRemSet::num_par_rem_sets()-1; |
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364 if (n <= 0) return; |
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365 if (_par_tables == NULL) { |
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366 PerRegionTable* res = |
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367 (PerRegionTable*) |
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368 Atomic::cmpxchg_ptr((PerRegionTable*)ReserveParTableExpansion, |
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369 &_par_tables, NULL); |
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370 if (res != NULL) return; |
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371 // Otherwise, we reserved the right to do the expansion. |
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372 |
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373 PerRegionTable** ptables = NEW_C_HEAP_ARRAY(PerRegionTable*, n); |
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374 for (int i = 0; i < n; i++) { |
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375 PerRegionTable* ptable = PerRegionTable::alloc(hr()); |
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376 ptables[i] = ptable; |
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377 } |
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378 // Here we do not need an atomic. |
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379 _par_tables = ptables; |
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380 #if COUNT_PAR_EXPANDS |
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381 print_par_expand(); |
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382 #endif |
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383 // We must put this table on the expanded list. |
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384 PosParPRT* exp_head = _par_expanded_list; |
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385 while (true) { |
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386 set_next_par_expanded(exp_head); |
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387 PosParPRT* res = |
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388 (PosParPRT*) |
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389 Atomic::cmpxchg_ptr(this, &_par_expanded_list, exp_head); |
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390 if (res == exp_head) return; |
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391 // Otherwise. |
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392 exp_head = res; |
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393 } |
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394 ShouldNotReachHere(); |
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395 } |
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396 } |
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397 |
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398 void add_reference(OopOrNarrowOopStar from, int tid) { |
| 342 | 399 // Expand if necessary. |
| 400 PerRegionTable** pt = par_tables(); | |
| 401 if (pt != NULL) { | |
| 402 // We always have to assume that mods to table 0 are in parallel, | |
| 403 // because of the claiming scheme in parallel expansion. A thread | |
| 404 // with tid != 0 that finds the table to be NULL, but doesn't succeed | |
| 405 // in claiming the right of expanding it, will end up in the else | |
| 406 // clause of the above if test. That thread could be delayed, and a | |
| 407 // thread 0 add reference could see the table expanded, and come | |
| 408 // here. Both threads would be adding in parallel. But we get to | |
| 409 // not use atomics for tids > 0. | |
| 410 if (tid == 0) { | |
| 411 PerRegionTable::add_reference(from); | |
| 412 } else { | |
| 413 pt[tid-1]->seq_add_reference(from); | |
| 414 } | |
| 415 } else { | |
| 416 // Not expanded -- add to the base table. | |
| 417 PerRegionTable::add_reference(from); | |
| 418 } | |
| 419 } | |
| 420 | |
| 421 void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { | |
| 422 assert(_par_tables == NULL, "Precondition"); | |
| 423 PerRegionTable::scrub(ctbs, card_bm); | |
| 424 } | |
| 425 | |
| 426 size_t mem_size() const { | |
| 427 size_t res = | |
| 428 PerRegionTable::mem_size() + sizeof(this) - sizeof(PerRegionTable); | |
| 429 if (_par_tables != NULL) { | |
| 430 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { | |
| 431 res += _par_tables[i]->mem_size(); | |
| 432 } | |
| 433 } | |
| 434 return res; | |
| 435 } | |
| 436 | |
| 437 static size_t fl_mem_size() { | |
| 438 PosParPRT* cur = _free_list; | |
| 439 size_t res = 0; | |
| 440 while (cur != NULL) { | |
| 441 res += sizeof(PosParPRT); | |
| 442 cur = cur->next(); | |
| 443 } | |
| 444 return res; | |
| 445 } | |
| 446 | |
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447 bool contains_reference(OopOrNarrowOopStar from) const { |
| 342 | 448 if (PerRegionTable::contains_reference(from)) return true; |
| 449 if (_par_tables != NULL) { | |
| 450 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { | |
| 451 if (_par_tables[i]->contains_reference(from)) return true; | |
| 452 } | |
| 453 } | |
| 454 return false; | |
| 455 } | |
| 456 | |
| 457 static void par_contract_all(); | |
| 458 | |
| 459 }; | |
| 460 | |
| 461 void PosParPRT::par_contract_all() { | |
| 462 PosParPRT* hd = _par_expanded_list; | |
| 463 while (hd != NULL) { | |
| 464 PosParPRT* nxt = hd->next_par_expanded(); | |
| 465 PosParPRT* res = | |
| 466 (PosParPRT*) | |
| 467 Atomic::cmpxchg_ptr(nxt, &_par_expanded_list, hd); | |
| 468 if (res == hd) { | |
| 469 // We claimed the right to contract this table. | |
| 470 hd->set_next_par_expanded(NULL); | |
| 471 hd->par_contract(); | |
| 472 hd = _par_expanded_list; | |
| 473 } else { | |
| 474 hd = res; | |
| 475 } | |
| 476 } | |
| 477 } | |
| 478 | |
| 479 PosParPRT* PosParPRT::_free_list = NULL; | |
| 480 PosParPRT* PosParPRT::_par_expanded_list = NULL; | |
| 481 | |
| 482 jint OtherRegionsTable::_cache_probes = 0; | |
| 483 jint OtherRegionsTable::_cache_hits = 0; | |
| 484 | |
| 485 size_t OtherRegionsTable::_max_fine_entries = 0; | |
| 486 size_t OtherRegionsTable::_mod_max_fine_entries_mask = 0; | |
| 487 #if SAMPLE_FOR_EVICTION | |
| 488 size_t OtherRegionsTable::_fine_eviction_stride = 0; | |
| 489 size_t OtherRegionsTable::_fine_eviction_sample_size = 0; | |
| 490 #endif | |
| 491 | |
| 492 OtherRegionsTable::OtherRegionsTable(HeapRegion* hr) : | |
| 493 _g1h(G1CollectedHeap::heap()), | |
| 494 _m(Mutex::leaf, "An OtherRegionsTable lock", true), | |
| 495 _hr(hr), | |
| 496 _coarse_map(G1CollectedHeap::heap()->max_regions(), | |
| 497 false /* in-resource-area */), | |
| 498 _fine_grain_regions(NULL), | |
| 499 _n_fine_entries(0), _n_coarse_entries(0), | |
| 500 #if SAMPLE_FOR_EVICTION | |
| 501 _fine_eviction_start(0), | |
| 502 #endif | |
| 503 _sparse_table(hr) | |
| 504 { | |
| 505 typedef PosParPRT* PosParPRTPtr; | |
| 506 if (_max_fine_entries == 0) { | |
| 507 assert(_mod_max_fine_entries_mask == 0, "Both or none."); | |
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508 _max_fine_entries = (size_t)(1 << G1LogRSRegionEntries); |
| 342 | 509 _mod_max_fine_entries_mask = _max_fine_entries - 1; |
| 510 #if SAMPLE_FOR_EVICTION | |
| 511 assert(_fine_eviction_sample_size == 0 | |
| 512 && _fine_eviction_stride == 0, "All init at same time."); | |
| 513 _fine_eviction_sample_size = MAX2((size_t)4, (size_t)G1LogRSRegionEntries); | |
| 514 _fine_eviction_stride = _max_fine_entries / _fine_eviction_sample_size; | |
| 515 #endif | |
| 516 } | |
| 517 _fine_grain_regions = new PosParPRTPtr[_max_fine_entries]; | |
| 518 if (_fine_grain_regions == NULL) | |
| 519 vm_exit_out_of_memory(sizeof(void*)*_max_fine_entries, | |
| 520 "Failed to allocate _fine_grain_entries."); | |
| 521 for (size_t i = 0; i < _max_fine_entries; i++) { | |
| 522 _fine_grain_regions[i] = NULL; | |
| 523 } | |
| 524 } | |
| 525 | |
| 526 int** OtherRegionsTable::_from_card_cache = NULL; | |
| 527 size_t OtherRegionsTable::_from_card_cache_max_regions = 0; | |
| 528 size_t OtherRegionsTable::_from_card_cache_mem_size = 0; | |
| 529 | |
| 530 void OtherRegionsTable::init_from_card_cache(size_t max_regions) { | |
| 531 _from_card_cache_max_regions = max_regions; | |
| 532 | |
| 533 int n_par_rs = HeapRegionRemSet::num_par_rem_sets(); | |
| 534 _from_card_cache = NEW_C_HEAP_ARRAY(int*, n_par_rs); | |
| 535 for (int i = 0; i < n_par_rs; i++) { | |
| 536 _from_card_cache[i] = NEW_C_HEAP_ARRAY(int, max_regions); | |
| 537 for (size_t j = 0; j < max_regions; j++) { | |
| 538 _from_card_cache[i][j] = -1; // An invalid value. | |
| 539 } | |
| 540 } | |
| 541 _from_card_cache_mem_size = n_par_rs * max_regions * sizeof(int); | |
| 542 } | |
| 543 | |
| 544 void OtherRegionsTable::shrink_from_card_cache(size_t new_n_regs) { | |
| 545 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
| 546 assert(new_n_regs <= _from_card_cache_max_regions, "Must be within max."); | |
| 547 for (size_t j = new_n_regs; j < _from_card_cache_max_regions; j++) { | |
| 548 _from_card_cache[i][j] = -1; // An invalid value. | |
| 549 } | |
| 550 } | |
| 551 } | |
| 552 | |
| 553 #ifndef PRODUCT | |
| 554 void OtherRegionsTable::print_from_card_cache() { | |
| 555 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
| 556 for (size_t j = 0; j < _from_card_cache_max_regions; j++) { | |
| 557 gclog_or_tty->print_cr("_from_card_cache[%d][%d] = %d.", | |
| 558 i, j, _from_card_cache[i][j]); | |
| 559 } | |
| 560 } | |
| 561 } | |
| 562 #endif | |
| 563 | |
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564 void OtherRegionsTable::add_reference(OopOrNarrowOopStar from, int tid) { |
| 342 | 565 size_t cur_hrs_ind = hr()->hrs_index(); |
| 566 | |
| 567 #if HRRS_VERBOSE | |
| 568 gclog_or_tty->print_cr("ORT::add_reference_work(" PTR_FORMAT "->" PTR_FORMAT ").", | |
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569 from, |
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570 UseCompressedOops |
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571 ? oopDesc::load_decode_heap_oop((narrowOop*)from) |
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572 : oopDesc::load_decode_heap_oop((oop*)from)); |
| 342 | 573 #endif |
| 574 | |
| 575 int from_card = (int)(uintptr_t(from) >> CardTableModRefBS::card_shift); | |
| 576 | |
| 577 #if HRRS_VERBOSE | |
| 578 gclog_or_tty->print_cr("Table for [" PTR_FORMAT "...): card %d (cache = %d)", | |
| 579 hr()->bottom(), from_card, | |
| 580 _from_card_cache[tid][cur_hrs_ind]); | |
| 581 #endif | |
| 582 | |
| 583 #define COUNT_CACHE 0 | |
| 584 #if COUNT_CACHE | |
| 585 jint p = Atomic::add(1, &_cache_probes); | |
| 586 if ((p % 10000) == 0) { | |
| 587 jint hits = _cache_hits; | |
| 588 gclog_or_tty->print_cr("%d/%d = %5.2f%% RS cache hits.", | |
| 589 _cache_hits, p, 100.0* (float)hits/(float)p); | |
| 590 } | |
| 591 #endif | |
| 592 if (from_card == _from_card_cache[tid][cur_hrs_ind]) { | |
| 593 #if HRRS_VERBOSE | |
| 594 gclog_or_tty->print_cr(" from-card cache hit."); | |
| 595 #endif | |
| 596 #if COUNT_CACHE | |
| 597 Atomic::inc(&_cache_hits); | |
| 598 #endif | |
| 599 assert(contains_reference(from), "We just added it!"); | |
| 600 return; | |
| 601 } else { | |
| 602 _from_card_cache[tid][cur_hrs_ind] = from_card; | |
| 603 } | |
| 604 | |
| 605 // Note that this may be a continued H region. | |
| 606 HeapRegion* from_hr = _g1h->heap_region_containing_raw(from); | |
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607 RegionIdx_t from_hrs_ind = (RegionIdx_t) from_hr->hrs_index(); |
| 342 | 608 |
| 609 // If the region is already coarsened, return. | |
| 610 if (_coarse_map.at(from_hrs_ind)) { | |
| 611 #if HRRS_VERBOSE | |
| 612 gclog_or_tty->print_cr(" coarse map hit."); | |
| 613 #endif | |
| 614 assert(contains_reference(from), "We just added it!"); | |
| 615 return; | |
| 616 } | |
| 617 | |
| 618 // Otherwise find a per-region table to add it to. | |
| 619 size_t ind = from_hrs_ind & _mod_max_fine_entries_mask; | |
| 620 PosParPRT* prt = find_region_table(ind, from_hr); | |
| 621 if (prt == NULL) { | |
| 622 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
| 623 // Confirm that it's really not there... | |
| 624 prt = find_region_table(ind, from_hr); | |
| 625 if (prt == NULL) { | |
| 626 | |
| 627 uintptr_t from_hr_bot_card_index = | |
| 628 uintptr_t(from_hr->bottom()) | |
| 629 >> CardTableModRefBS::card_shift; | |
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630 CardIdx_t card_index = from_card - from_hr_bot_card_index; |
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631 assert(0 <= card_index && card_index < HeapRegion::CardsPerRegion, |
| 342 | 632 "Must be in range."); |
| 633 if (G1HRRSUseSparseTable && | |
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634 _sparse_table.add_card(from_hrs_ind, card_index)) { |
| 342 | 635 if (G1RecordHRRSOops) { |
| 636 HeapRegionRemSet::record(hr(), from); | |
| 637 #if HRRS_VERBOSE | |
| 638 gclog_or_tty->print(" Added card " PTR_FORMAT " to region " | |
| 639 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", | |
| 640 align_size_down(uintptr_t(from), | |
| 641 CardTableModRefBS::card_size), | |
| 642 hr()->bottom(), from); | |
| 643 #endif | |
| 644 } | |
| 645 #if HRRS_VERBOSE | |
| 646 gclog_or_tty->print_cr(" added card to sparse table."); | |
| 647 #endif | |
| 648 assert(contains_reference_locked(from), "We just added it!"); | |
| 649 return; | |
| 650 } else { | |
| 651 #if HRRS_VERBOSE | |
| 652 gclog_or_tty->print_cr(" [tid %d] sparse table entry " | |
| 653 "overflow(f: %d, t: %d)", | |
| 654 tid, from_hrs_ind, cur_hrs_ind); | |
| 655 #endif | |
| 656 } | |
| 657 | |
| 658 // Otherwise, transfer from sparse to fine-grain. | |
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659 CardIdx_t cards[SparsePRTEntry::CardsPerEntry]; |
| 342 | 660 if (G1HRRSUseSparseTable) { |
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661 bool res = _sparse_table.get_cards(from_hrs_ind, &cards[0]); |
| 342 | 662 assert(res, "There should have been an entry"); |
| 663 } | |
| 664 | |
| 665 if (_n_fine_entries == _max_fine_entries) { | |
| 666 prt = delete_region_table(); | |
| 667 } else { | |
| 668 prt = PosParPRT::alloc(from_hr); | |
| 669 } | |
| 670 prt->init(from_hr); | |
| 671 // Record the outgoing pointer in the from_region's outgoing bitmap. | |
| 672 from_hr->rem_set()->add_outgoing_reference(hr()); | |
| 673 | |
| 674 PosParPRT* first_prt = _fine_grain_regions[ind]; | |
| 675 prt->set_next(first_prt); // XXX Maybe move to init? | |
| 676 _fine_grain_regions[ind] = prt; | |
| 677 _n_fine_entries++; | |
| 678 | |
| 679 // Add in the cards from the sparse table. | |
| 680 if (G1HRRSUseSparseTable) { | |
| 681 for (int i = 0; i < SparsePRTEntry::CardsPerEntry; i++) { | |
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682 CardIdx_t c = cards[i]; |
| 342 | 683 if (c != SparsePRTEntry::NullEntry) { |
| 684 prt->add_card(c); | |
| 685 } | |
| 686 } | |
| 687 // Now we can delete the sparse entry. | |
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688 bool res = _sparse_table.delete_entry(from_hrs_ind); |
| 342 | 689 assert(res, "It should have been there."); |
| 690 } | |
| 691 } | |
| 692 assert(prt != NULL && prt->hr() == from_hr, "consequence"); | |
| 693 } | |
| 694 // Note that we can't assert "prt->hr() == from_hr", because of the | |
| 695 // possibility of concurrent reuse. But see head comment of | |
| 696 // OtherRegionsTable for why this is OK. | |
| 697 assert(prt != NULL, "Inv"); | |
| 698 | |
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699 if (prt->should_expand(tid)) { |
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700 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); |
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701 HeapRegion* prt_hr = prt->hr(); |
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702 if (prt_hr == from_hr) { |
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703 // Make sure the table still corresponds to the same region |
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704 prt->par_expand(); |
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705 prt->add_reference(from, tid); |
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706 } |
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707 // else: The table has been concurrently coarsened, evicted, and |
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708 // the table data structure re-used for another table. So, we |
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709 // don't need to add the reference any more given that the table |
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710 // has been coarsened and the whole region will be scanned anyway. |
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711 } else { |
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712 prt->add_reference(from, tid); |
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713 } |
| 342 | 714 if (G1RecordHRRSOops) { |
| 715 HeapRegionRemSet::record(hr(), from); | |
| 716 #if HRRS_VERBOSE | |
| 717 gclog_or_tty->print("Added card " PTR_FORMAT " to region " | |
| 718 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", | |
| 719 align_size_down(uintptr_t(from), | |
| 720 CardTableModRefBS::card_size), | |
| 721 hr()->bottom(), from); | |
| 722 #endif | |
| 723 } | |
| 724 assert(contains_reference(from), "We just added it!"); | |
| 725 } | |
| 726 | |
| 727 PosParPRT* | |
| 728 OtherRegionsTable::find_region_table(size_t ind, HeapRegion* hr) const { | |
| 729 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
| 730 PosParPRT* prt = _fine_grain_regions[ind]; | |
| 731 while (prt != NULL && prt->hr() != hr) { | |
| 732 prt = prt->next(); | |
| 733 } | |
| 734 // Loop postcondition is the method postcondition. | |
| 735 return prt; | |
| 736 } | |
| 737 | |
| 738 | |
| 739 #define DRT_CENSUS 0 | |
| 740 | |
| 741 #if DRT_CENSUS | |
| 742 static const int HistoSize = 6; | |
| 743 static int global_histo[HistoSize] = { 0, 0, 0, 0, 0, 0 }; | |
| 744 static int coarsenings = 0; | |
| 745 static int occ_sum = 0; | |
| 746 #endif | |
| 747 | |
| 748 jint OtherRegionsTable::_n_coarsenings = 0; | |
| 749 | |
| 750 PosParPRT* OtherRegionsTable::delete_region_table() { | |
| 751 #if DRT_CENSUS | |
| 752 int histo[HistoSize] = { 0, 0, 0, 0, 0, 0 }; | |
| 753 const int histo_limits[] = { 1, 4, 16, 64, 256, 2048 }; | |
| 754 #endif | |
| 755 | |
| 756 assert(_m.owned_by_self(), "Precondition"); | |
| 757 assert(_n_fine_entries == _max_fine_entries, "Precondition"); | |
| 758 PosParPRT* max = NULL; | |
| 759 jint max_occ = 0; | |
| 760 PosParPRT** max_prev; | |
| 761 size_t max_ind; | |
| 762 | |
| 763 #if SAMPLE_FOR_EVICTION | |
| 764 size_t i = _fine_eviction_start; | |
| 765 for (size_t k = 0; k < _fine_eviction_sample_size; k++) { | |
| 766 size_t ii = i; | |
| 767 // Make sure we get a non-NULL sample. | |
| 768 while (_fine_grain_regions[ii] == NULL) { | |
| 769 ii++; | |
| 770 if (ii == _max_fine_entries) ii = 0; | |
| 771 guarantee(ii != i, "We must find one."); | |
| 772 } | |
| 773 PosParPRT** prev = &_fine_grain_regions[ii]; | |
| 774 PosParPRT* cur = *prev; | |
| 775 while (cur != NULL) { | |
| 776 jint cur_occ = cur->occupied(); | |
| 777 if (max == NULL || cur_occ > max_occ) { | |
| 778 max = cur; | |
| 779 max_prev = prev; | |
| 780 max_ind = i; | |
| 781 max_occ = cur_occ; | |
| 782 } | |
| 783 prev = cur->next_addr(); | |
| 784 cur = cur->next(); | |
| 785 } | |
| 786 i = i + _fine_eviction_stride; | |
| 787 if (i >= _n_fine_entries) i = i - _n_fine_entries; | |
| 788 } | |
| 789 _fine_eviction_start++; | |
| 790 if (_fine_eviction_start >= _n_fine_entries) | |
| 791 _fine_eviction_start -= _n_fine_entries; | |
| 792 #else | |
| 793 for (int i = 0; i < _max_fine_entries; i++) { | |
| 794 PosParPRT** prev = &_fine_grain_regions[i]; | |
| 795 PosParPRT* cur = *prev; | |
| 796 while (cur != NULL) { | |
| 797 jint cur_occ = cur->occupied(); | |
| 798 #if DRT_CENSUS | |
| 799 for (int k = 0; k < HistoSize; k++) { | |
| 800 if (cur_occ <= histo_limits[k]) { | |
| 801 histo[k]++; global_histo[k]++; break; | |
| 802 } | |
| 803 } | |
| 804 #endif | |
| 805 if (max == NULL || cur_occ > max_occ) { | |
| 806 max = cur; | |
| 807 max_prev = prev; | |
| 808 max_ind = i; | |
| 809 max_occ = cur_occ; | |
| 810 } | |
| 811 prev = cur->next_addr(); | |
| 812 cur = cur->next(); | |
| 813 } | |
| 814 } | |
| 815 #endif | |
| 816 // XXX | |
| 817 guarantee(max != NULL, "Since _n_fine_entries > 0"); | |
| 818 #if DRT_CENSUS | |
| 819 gclog_or_tty->print_cr("In a coarsening: histo of occs:"); | |
| 820 for (int k = 0; k < HistoSize; k++) { | |
| 821 gclog_or_tty->print_cr(" <= %4d: %5d.", histo_limits[k], histo[k]); | |
| 822 } | |
| 823 coarsenings++; | |
| 824 occ_sum += max_occ; | |
| 825 if ((coarsenings % 100) == 0) { | |
| 826 gclog_or_tty->print_cr("\ncoarsenings = %d; global summary:", coarsenings); | |
| 827 for (int k = 0; k < HistoSize; k++) { | |
| 828 gclog_or_tty->print_cr(" <= %4d: %5d.", histo_limits[k], global_histo[k]); | |
| 829 } | |
| 830 gclog_or_tty->print_cr("Avg occ of deleted region = %6.2f.", | |
| 831 (float)occ_sum/(float)coarsenings); | |
| 832 } | |
| 833 #endif | |
| 834 | |
| 835 // Set the corresponding coarse bit. | |
| 836 int max_hrs_index = max->hr()->hrs_index(); | |
| 837 if (!_coarse_map.at(max_hrs_index)) { | |
| 838 _coarse_map.at_put(max_hrs_index, true); | |
| 839 _n_coarse_entries++; | |
| 840 #if 0 | |
| 841 gclog_or_tty->print("Coarsened entry in region [" PTR_FORMAT "...] " | |
| 842 "for region [" PTR_FORMAT "...] (%d coarse entries).\n", | |
| 843 hr()->bottom(), | |
| 844 max->hr()->bottom(), | |
| 845 _n_coarse_entries); | |
| 846 #endif | |
| 847 } | |
| 848 | |
| 849 // Unsplice. | |
| 850 *max_prev = max->next(); | |
| 851 Atomic::inc(&_n_coarsenings); | |
| 852 _n_fine_entries--; | |
| 853 return max; | |
| 854 } | |
| 855 | |
| 856 | |
| 857 // At present, this must be called stop-world single-threaded. | |
| 858 void OtherRegionsTable::scrub(CardTableModRefBS* ctbs, | |
| 859 BitMap* region_bm, BitMap* card_bm) { | |
| 860 // First eliminated garbage regions from the coarse map. | |
| 861 if (G1RSScrubVerbose) | |
| 862 gclog_or_tty->print_cr("Scrubbing region %d:", hr()->hrs_index()); | |
| 863 | |
| 864 assert(_coarse_map.size() == region_bm->size(), "Precondition"); | |
| 865 if (G1RSScrubVerbose) | |
| 866 gclog_or_tty->print(" Coarse map: before = %d...", _n_coarse_entries); | |
| 867 _coarse_map.set_intersection(*region_bm); | |
| 868 _n_coarse_entries = _coarse_map.count_one_bits(); | |
| 869 if (G1RSScrubVerbose) | |
| 870 gclog_or_tty->print_cr(" after = %d.", _n_coarse_entries); | |
| 871 | |
| 872 // Now do the fine-grained maps. | |
| 873 for (size_t i = 0; i < _max_fine_entries; i++) { | |
| 874 PosParPRT* cur = _fine_grain_regions[i]; | |
| 875 PosParPRT** prev = &_fine_grain_regions[i]; | |
| 876 while (cur != NULL) { | |
| 877 PosParPRT* nxt = cur->next(); | |
| 878 // If the entire region is dead, eliminate. | |
| 879 if (G1RSScrubVerbose) | |
| 880 gclog_or_tty->print_cr(" For other region %d:", cur->hr()->hrs_index()); | |
| 881 if (!region_bm->at(cur->hr()->hrs_index())) { | |
| 882 *prev = nxt; | |
| 883 cur->set_next(NULL); | |
| 884 _n_fine_entries--; | |
| 885 if (G1RSScrubVerbose) | |
| 886 gclog_or_tty->print_cr(" deleted via region map."); | |
| 887 PosParPRT::free(cur); | |
| 888 } else { | |
| 889 // Do fine-grain elimination. | |
| 890 if (G1RSScrubVerbose) | |
| 891 gclog_or_tty->print(" occ: before = %4d.", cur->occupied()); | |
| 892 cur->scrub(ctbs, card_bm); | |
| 893 if (G1RSScrubVerbose) | |
| 894 gclog_or_tty->print_cr(" after = %4d.", cur->occupied()); | |
| 895 // Did that empty the table completely? | |
| 896 if (cur->occupied() == 0) { | |
| 897 *prev = nxt; | |
| 898 cur->set_next(NULL); | |
| 899 _n_fine_entries--; | |
| 900 PosParPRT::free(cur); | |
| 901 } else { | |
| 902 prev = cur->next_addr(); | |
| 903 } | |
| 904 } | |
| 905 cur = nxt; | |
| 906 } | |
| 907 } | |
| 908 // Since we may have deleted a from_card_cache entry from the RS, clear | |
| 909 // the FCC. | |
| 910 clear_fcc(); | |
| 911 } | |
| 912 | |
| 913 | |
| 914 size_t OtherRegionsTable::occupied() const { | |
| 915 // Cast away const in this case. | |
| 916 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
| 917 size_t sum = occ_fine(); | |
| 918 sum += occ_sparse(); | |
| 919 sum += occ_coarse(); | |
| 920 return sum; | |
| 921 } | |
| 922 | |
| 923 size_t OtherRegionsTable::occ_fine() const { | |
| 924 size_t sum = 0; | |
| 925 for (size_t i = 0; i < _max_fine_entries; i++) { | |
| 926 PosParPRT* cur = _fine_grain_regions[i]; | |
| 927 while (cur != NULL) { | |
| 928 sum += cur->occupied(); | |
| 929 cur = cur->next(); | |
| 930 } | |
| 931 } | |
| 932 return sum; | |
| 933 } | |
| 934 | |
| 935 size_t OtherRegionsTable::occ_coarse() const { | |
|
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936 return (_n_coarse_entries * HeapRegion::CardsPerRegion); |
| 342 | 937 } |
| 938 | |
| 939 size_t OtherRegionsTable::occ_sparse() const { | |
| 940 return _sparse_table.occupied(); | |
| 941 } | |
| 942 | |
| 943 size_t OtherRegionsTable::mem_size() const { | |
| 944 // Cast away const in this case. | |
| 945 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
| 946 size_t sum = 0; | |
| 947 for (size_t i = 0; i < _max_fine_entries; i++) { | |
| 948 PosParPRT* cur = _fine_grain_regions[i]; | |
| 949 while (cur != NULL) { | |
| 950 sum += cur->mem_size(); | |
| 951 cur = cur->next(); | |
| 952 } | |
| 953 } | |
| 954 sum += (sizeof(PosParPRT*) * _max_fine_entries); | |
| 955 sum += (_coarse_map.size_in_words() * HeapWordSize); | |
| 956 sum += (_sparse_table.mem_size()); | |
| 957 sum += sizeof(*this) - sizeof(_sparse_table); // Avoid double counting above. | |
| 958 return sum; | |
| 959 } | |
| 960 | |
| 961 size_t OtherRegionsTable::static_mem_size() { | |
| 962 return _from_card_cache_mem_size; | |
| 963 } | |
| 964 | |
| 965 size_t OtherRegionsTable::fl_mem_size() { | |
| 966 return PerRegionTable::fl_mem_size() + PosParPRT::fl_mem_size(); | |
| 967 } | |
| 968 | |
| 969 void OtherRegionsTable::clear_fcc() { | |
| 970 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
| 971 _from_card_cache[i][hr()->hrs_index()] = -1; | |
| 972 } | |
| 973 } | |
| 974 | |
| 975 void OtherRegionsTable::clear() { | |
| 976 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
| 977 for (size_t i = 0; i < _max_fine_entries; i++) { | |
| 978 PosParPRT* cur = _fine_grain_regions[i]; | |
| 979 while (cur != NULL) { | |
| 980 PosParPRT* nxt = cur->next(); | |
| 981 PosParPRT::free(cur); | |
| 982 cur = nxt; | |
| 983 } | |
| 984 _fine_grain_regions[i] = NULL; | |
| 985 } | |
| 986 _sparse_table.clear(); | |
| 987 _coarse_map.clear(); | |
| 988 _n_fine_entries = 0; | |
| 989 _n_coarse_entries = 0; | |
| 990 | |
| 991 clear_fcc(); | |
| 992 } | |
| 993 | |
| 994 void OtherRegionsTable::clear_incoming_entry(HeapRegion* from_hr) { | |
| 995 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
| 996 size_t hrs_ind = (size_t)from_hr->hrs_index(); | |
| 997 size_t ind = hrs_ind & _mod_max_fine_entries_mask; | |
| 998 if (del_single_region_table(ind, from_hr)) { | |
| 999 assert(!_coarse_map.at(hrs_ind), "Inv"); | |
| 1000 } else { | |
| 1001 _coarse_map.par_at_put(hrs_ind, 0); | |
| 1002 } | |
| 1003 // Check to see if any of the fcc entries come from here. | |
| 1004 int hr_ind = hr()->hrs_index(); | |
| 1005 for (int tid = 0; tid < HeapRegionRemSet::num_par_rem_sets(); tid++) { | |
| 1006 int fcc_ent = _from_card_cache[tid][hr_ind]; | |
| 1007 if (fcc_ent != -1) { | |
| 1008 HeapWord* card_addr = (HeapWord*) | |
| 1009 (uintptr_t(fcc_ent) << CardTableModRefBS::card_shift); | |
| 1010 if (hr()->is_in_reserved(card_addr)) { | |
| 1011 // Clear the from card cache. | |
| 1012 _from_card_cache[tid][hr_ind] = -1; | |
| 1013 } | |
| 1014 } | |
| 1015 } | |
| 1016 } | |
| 1017 | |
| 1018 bool OtherRegionsTable::del_single_region_table(size_t ind, | |
| 1019 HeapRegion* hr) { | |
| 1020 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
| 1021 PosParPRT** prev_addr = &_fine_grain_regions[ind]; | |
| 1022 PosParPRT* prt = *prev_addr; | |
| 1023 while (prt != NULL && prt->hr() != hr) { | |
| 1024 prev_addr = prt->next_addr(); | |
| 1025 prt = prt->next(); | |
| 1026 } | |
| 1027 if (prt != NULL) { | |
| 1028 assert(prt->hr() == hr, "Loop postcondition."); | |
| 1029 *prev_addr = prt->next(); | |
| 1030 PosParPRT::free(prt); | |
| 1031 _n_fine_entries--; | |
| 1032 return true; | |
| 1033 } else { | |
| 1034 return false; | |
| 1035 } | |
| 1036 } | |
| 1037 | |
|
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1038 bool OtherRegionsTable::contains_reference(OopOrNarrowOopStar from) const { |
| 342 | 1039 // Cast away const in this case. |
| 1040 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
| 1041 return contains_reference_locked(from); | |
| 1042 } | |
| 1043 | |
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1044 bool OtherRegionsTable::contains_reference_locked(OopOrNarrowOopStar from) const { |
| 342 | 1045 HeapRegion* hr = _g1h->heap_region_containing_raw(from); |
| 1046 if (hr == NULL) return false; | |
|
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1047 RegionIdx_t hr_ind = (RegionIdx_t) hr->hrs_index(); |
| 342 | 1048 // Is this region in the coarse map? |
| 1049 if (_coarse_map.at(hr_ind)) return true; | |
| 1050 | |
| 1051 PosParPRT* prt = find_region_table(hr_ind & _mod_max_fine_entries_mask, | |
| 1052 hr); | |
| 1053 if (prt != NULL) { | |
| 1054 return prt->contains_reference(from); | |
| 1055 | |
| 1056 } else { | |
| 1057 uintptr_t from_card = | |
| 1058 (uintptr_t(from) >> CardTableModRefBS::card_shift); | |
| 1059 uintptr_t hr_bot_card_index = | |
| 1060 uintptr_t(hr->bottom()) >> CardTableModRefBS::card_shift; | |
| 1061 assert(from_card >= hr_bot_card_index, "Inv"); | |
|
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1062 CardIdx_t card_index = from_card - hr_bot_card_index; |
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1063 assert(0 <= card_index && card_index < HeapRegion::CardsPerRegion, |
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1064 "Must be in range."); |
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1065 return _sparse_table.contains_card(hr_ind, card_index); |
| 342 | 1066 } |
| 1067 | |
| 1068 | |
| 1069 } | |
| 1070 | |
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1071 // Determines how many threads can add records to an rset in parallel. |
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1072 // This can be done by either mutator threads together with the |
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1073 // concurrent refinement threads or GC threads. |
| 342 | 1074 int HeapRegionRemSet::num_par_rem_sets() { |
|
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1075 return (int)MAX2(DirtyCardQueueSet::num_par_ids() + ConcurrentG1Refine::thread_num(), ParallelGCThreads); |
| 342 | 1076 } |
| 1077 | |
| 1078 HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, | |
| 1079 HeapRegion* hr) | |
| 1080 : _bosa(bosa), _other_regions(hr), | |
| 1081 _outgoing_region_map(G1CollectedHeap::heap()->max_regions(), | |
| 1082 false /* in-resource-area */), | |
| 1083 _iter_state(Unclaimed) | |
| 1084 {} | |
| 1085 | |
| 1086 | |
| 1087 void HeapRegionRemSet::init_for_par_iteration() { | |
| 1088 _iter_state = Unclaimed; | |
| 1089 } | |
| 1090 | |
| 1091 bool HeapRegionRemSet::claim_iter() { | |
| 1092 if (_iter_state != Unclaimed) return false; | |
| 1093 jint res = Atomic::cmpxchg(Claimed, (jint*)(&_iter_state), Unclaimed); | |
| 1094 return (res == Unclaimed); | |
| 1095 } | |
| 1096 | |
| 1097 void HeapRegionRemSet::set_iter_complete() { | |
| 1098 _iter_state = Complete; | |
| 1099 } | |
| 1100 | |
| 1101 bool HeapRegionRemSet::iter_is_complete() { | |
| 1102 return _iter_state == Complete; | |
| 1103 } | |
| 1104 | |
| 1105 | |
| 1106 void HeapRegionRemSet::init_iterator(HeapRegionRemSetIterator* iter) const { | |
| 1107 iter->initialize(this); | |
| 1108 } | |
| 1109 | |
| 1110 #ifndef PRODUCT | |
| 1111 void HeapRegionRemSet::print() const { | |
| 1112 HeapRegionRemSetIterator iter; | |
| 1113 init_iterator(&iter); | |
| 1114 size_t card_index; | |
| 1115 while (iter.has_next(card_index)) { | |
| 1116 HeapWord* card_start = | |
| 1117 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
| 1118 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); | |
| 1119 } | |
| 1120 // XXX | |
| 1121 if (iter.n_yielded() != occupied()) { | |
| 1122 gclog_or_tty->print_cr("Yielded disagrees with occupied:"); | |
| 1123 gclog_or_tty->print_cr(" %6d yielded (%6d coarse, %6d fine).", | |
| 1124 iter.n_yielded(), | |
| 1125 iter.n_yielded_coarse(), iter.n_yielded_fine()); | |
| 1126 gclog_or_tty->print_cr(" %6d occ (%6d coarse, %6d fine).", | |
| 1127 occupied(), occ_coarse(), occ_fine()); | |
| 1128 } | |
| 1129 guarantee(iter.n_yielded() == occupied(), | |
| 1130 "We should have yielded all the represented cards."); | |
| 1131 } | |
| 1132 #endif | |
| 1133 | |
| 1134 void HeapRegionRemSet::cleanup() { | |
| 1135 SparsePRT::cleanup_all(); | |
| 1136 } | |
| 1137 | |
| 1138 void HeapRegionRemSet::par_cleanup() { | |
| 1139 PosParPRT::par_contract_all(); | |
| 1140 } | |
| 1141 | |
| 1142 void HeapRegionRemSet::add_outgoing_reference(HeapRegion* to_hr) { | |
| 1143 _outgoing_region_map.par_at_put(to_hr->hrs_index(), 1); | |
| 1144 } | |
| 1145 | |
| 1146 void HeapRegionRemSet::clear() { | |
| 1147 clear_outgoing_entries(); | |
| 1148 _outgoing_region_map.clear(); | |
| 1149 _other_regions.clear(); | |
| 1150 assert(occupied() == 0, "Should be clear."); | |
| 1151 } | |
| 1152 | |
| 1153 void HeapRegionRemSet::clear_outgoing_entries() { | |
| 1154 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1155 size_t i = _outgoing_region_map.get_next_one_offset(0); | |
| 1156 while (i < _outgoing_region_map.size()) { | |
| 1157 HeapRegion* to_region = g1h->region_at(i); | |
| 545 | 1158 if (!to_region->in_collection_set()) { |
| 1159 to_region->rem_set()->clear_incoming_entry(hr()); | |
| 1160 } | |
| 342 | 1161 i = _outgoing_region_map.get_next_one_offset(i+1); |
| 1162 } | |
| 1163 } | |
| 1164 | |
| 1165 | |
| 1166 void HeapRegionRemSet::scrub(CardTableModRefBS* ctbs, | |
| 1167 BitMap* region_bm, BitMap* card_bm) { | |
| 1168 _other_regions.scrub(ctbs, region_bm, card_bm); | |
| 1169 } | |
| 1170 | |
| 1171 //-------------------- Iteration -------------------- | |
| 1172 | |
| 1173 HeapRegionRemSetIterator:: | |
| 1174 HeapRegionRemSetIterator() : | |
| 1175 _hrrs(NULL), | |
| 1176 _g1h(G1CollectedHeap::heap()), | |
| 1177 _bosa(NULL), | |
| 1178 _sparse_iter(size_t(G1CollectedHeap::heap()->reserved_region().start()) | |
| 1179 >> CardTableModRefBS::card_shift) | |
| 1180 {} | |
| 1181 | |
| 1182 void HeapRegionRemSetIterator::initialize(const HeapRegionRemSet* hrrs) { | |
| 1183 _hrrs = hrrs; | |
| 1184 _coarse_map = &_hrrs->_other_regions._coarse_map; | |
| 1185 _fine_grain_regions = _hrrs->_other_regions._fine_grain_regions; | |
| 1186 _bosa = _hrrs->bosa(); | |
| 1187 | |
| 1188 _is = Sparse; | |
| 1189 // Set these values so that we increment to the first region. | |
| 1190 _coarse_cur_region_index = -1; | |
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1191 _coarse_cur_region_cur_card = (HeapRegion::CardsPerRegion-1);; |
| 342 | 1192 |
| 1193 _cur_region_cur_card = 0; | |
| 1194 | |
| 1195 _fine_array_index = -1; | |
| 1196 _fine_cur_prt = NULL; | |
| 1197 | |
| 1198 _n_yielded_coarse = 0; | |
| 1199 _n_yielded_fine = 0; | |
| 1200 _n_yielded_sparse = 0; | |
| 1201 | |
| 1202 _sparse_iter.init(&hrrs->_other_regions._sparse_table); | |
| 1203 } | |
| 1204 | |
| 1205 bool HeapRegionRemSetIterator::coarse_has_next(size_t& card_index) { | |
| 1206 if (_hrrs->_other_regions._n_coarse_entries == 0) return false; | |
| 1207 // Go to the next card. | |
| 1208 _coarse_cur_region_cur_card++; | |
| 1209 // Was the last the last card in the current region? | |
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1210 if (_coarse_cur_region_cur_card == HeapRegion::CardsPerRegion) { |
| 342 | 1211 // Yes: find the next region. This may leave _coarse_cur_region_index |
| 1212 // Set to the last index, in which case there are no more coarse | |
| 1213 // regions. | |
| 1214 _coarse_cur_region_index = | |
| 1215 (int) _coarse_map->get_next_one_offset(_coarse_cur_region_index + 1); | |
| 1216 if ((size_t)_coarse_cur_region_index < _coarse_map->size()) { | |
| 1217 _coarse_cur_region_cur_card = 0; | |
| 1218 HeapWord* r_bot = | |
| 1219 _g1h->region_at(_coarse_cur_region_index)->bottom(); | |
| 1220 _cur_region_card_offset = _bosa->index_for(r_bot); | |
| 1221 } else { | |
| 1222 return false; | |
| 1223 } | |
| 1224 } | |
| 1225 // If we didn't return false above, then we can yield a card. | |
| 1226 card_index = _cur_region_card_offset + _coarse_cur_region_cur_card; | |
| 1227 return true; | |
| 1228 } | |
| 1229 | |
| 1230 void HeapRegionRemSetIterator::fine_find_next_non_null_prt() { | |
| 1231 // Otherwise, find the next bucket list in the array. | |
| 1232 _fine_array_index++; | |
| 1233 while (_fine_array_index < (int) OtherRegionsTable::_max_fine_entries) { | |
| 1234 _fine_cur_prt = _fine_grain_regions[_fine_array_index]; | |
| 1235 if (_fine_cur_prt != NULL) return; | |
| 1236 else _fine_array_index++; | |
| 1237 } | |
| 1238 assert(_fine_cur_prt == NULL, "Loop post"); | |
| 1239 } | |
| 1240 | |
| 1241 bool HeapRegionRemSetIterator::fine_has_next(size_t& card_index) { | |
| 1242 if (fine_has_next()) { | |
| 1243 _cur_region_cur_card = | |
| 1244 _fine_cur_prt->_bm.get_next_one_offset(_cur_region_cur_card + 1); | |
| 1245 } | |
| 1246 while (!fine_has_next()) { | |
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1247 if (_cur_region_cur_card == (size_t) HeapRegion::CardsPerRegion) { |
| 342 | 1248 _cur_region_cur_card = 0; |
| 1249 _fine_cur_prt = _fine_cur_prt->next(); | |
| 1250 } | |
| 1251 if (_fine_cur_prt == NULL) { | |
| 1252 fine_find_next_non_null_prt(); | |
| 1253 if (_fine_cur_prt == NULL) return false; | |
| 1254 } | |
| 1255 assert(_fine_cur_prt != NULL && _cur_region_cur_card == 0, | |
| 1256 "inv."); | |
| 1257 HeapWord* r_bot = | |
| 1258 _fine_cur_prt->hr()->bottom(); | |
| 1259 _cur_region_card_offset = _bosa->index_for(r_bot); | |
| 1260 _cur_region_cur_card = _fine_cur_prt->_bm.get_next_one_offset(0); | |
| 1261 } | |
| 1262 assert(fine_has_next(), "Or else we exited the loop via the return."); | |
| 1263 card_index = _cur_region_card_offset + _cur_region_cur_card; | |
| 1264 return true; | |
| 1265 } | |
| 1266 | |
| 1267 bool HeapRegionRemSetIterator::fine_has_next() { | |
| 1268 return | |
| 1269 _fine_cur_prt != NULL && | |
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1270 _cur_region_cur_card < (size_t) HeapRegion::CardsPerRegion; |
| 342 | 1271 } |
| 1272 | |
| 1273 bool HeapRegionRemSetIterator::has_next(size_t& card_index) { | |
| 1274 switch (_is) { | |
| 1275 case Sparse: | |
| 1276 if (_sparse_iter.has_next(card_index)) { | |
| 1277 _n_yielded_sparse++; | |
| 1278 return true; | |
| 1279 } | |
| 1280 // Otherwise, deliberate fall-through | |
| 1281 _is = Fine; | |
| 1282 case Fine: | |
| 1283 if (fine_has_next(card_index)) { | |
| 1284 _n_yielded_fine++; | |
| 1285 return true; | |
| 1286 } | |
| 1287 // Otherwise, deliberate fall-through | |
| 1288 _is = Coarse; | |
| 1289 case Coarse: | |
| 1290 if (coarse_has_next(card_index)) { | |
| 1291 _n_yielded_coarse++; | |
| 1292 return true; | |
| 1293 } | |
| 1294 // Otherwise... | |
| 1295 break; | |
| 1296 } | |
| 1297 assert(ParallelGCThreads > 1 || | |
| 1298 n_yielded() == _hrrs->occupied(), | |
| 1299 "Should have yielded all the cards in the rem set " | |
| 1300 "(in the non-par case)."); | |
| 1301 return false; | |
| 1302 } | |
| 1303 | |
| 1304 | |
| 1305 | |
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1306 OopOrNarrowOopStar* HeapRegionRemSet::_recorded_oops = NULL; |
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1307 HeapWord** HeapRegionRemSet::_recorded_cards = NULL; |
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1308 HeapRegion** HeapRegionRemSet::_recorded_regions = NULL; |
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1309 int HeapRegionRemSet::_n_recorded = 0; |
| 342 | 1310 |
| 1311 HeapRegionRemSet::Event* HeapRegionRemSet::_recorded_events = NULL; | |
| 1312 int* HeapRegionRemSet::_recorded_event_index = NULL; | |
| 1313 int HeapRegionRemSet::_n_recorded_events = 0; | |
| 1314 | |
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1315 void HeapRegionRemSet::record(HeapRegion* hr, OopOrNarrowOopStar f) { |
| 342 | 1316 if (_recorded_oops == NULL) { |
| 1317 assert(_n_recorded == 0 | |
| 1318 && _recorded_cards == NULL | |
| 1319 && _recorded_regions == NULL, | |
| 1320 "Inv"); | |
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1321 _recorded_oops = NEW_C_HEAP_ARRAY(OopOrNarrowOopStar, MaxRecorded); |
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1322 _recorded_cards = NEW_C_HEAP_ARRAY(HeapWord*, MaxRecorded); |
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1323 _recorded_regions = NEW_C_HEAP_ARRAY(HeapRegion*, MaxRecorded); |
| 342 | 1324 } |
| 1325 if (_n_recorded == MaxRecorded) { | |
| 1326 gclog_or_tty->print_cr("Filled up 'recorded' (%d).", MaxRecorded); | |
| 1327 } else { | |
| 1328 _recorded_cards[_n_recorded] = | |
| 1329 (HeapWord*)align_size_down(uintptr_t(f), | |
| 1330 CardTableModRefBS::card_size); | |
| 1331 _recorded_oops[_n_recorded] = f; | |
| 1332 _recorded_regions[_n_recorded] = hr; | |
| 1333 _n_recorded++; | |
| 1334 } | |
| 1335 } | |
| 1336 | |
| 1337 void HeapRegionRemSet::record_event(Event evnt) { | |
| 1338 if (!G1RecordHRRSEvents) return; | |
| 1339 | |
| 1340 if (_recorded_events == NULL) { | |
| 1341 assert(_n_recorded_events == 0 | |
| 1342 && _recorded_event_index == NULL, | |
| 1343 "Inv"); | |
| 1344 _recorded_events = NEW_C_HEAP_ARRAY(Event, MaxRecordedEvents); | |
| 1345 _recorded_event_index = NEW_C_HEAP_ARRAY(int, MaxRecordedEvents); | |
| 1346 } | |
| 1347 if (_n_recorded_events == MaxRecordedEvents) { | |
| 1348 gclog_or_tty->print_cr("Filled up 'recorded_events' (%d).", MaxRecordedEvents); | |
| 1349 } else { | |
| 1350 _recorded_events[_n_recorded_events] = evnt; | |
| 1351 _recorded_event_index[_n_recorded_events] = _n_recorded; | |
| 1352 _n_recorded_events++; | |
| 1353 } | |
| 1354 } | |
| 1355 | |
| 1356 void HeapRegionRemSet::print_event(outputStream* str, Event evnt) { | |
| 1357 switch (evnt) { | |
| 1358 case Event_EvacStart: | |
| 1359 str->print("Evac Start"); | |
| 1360 break; | |
| 1361 case Event_EvacEnd: | |
| 1362 str->print("Evac End"); | |
| 1363 break; | |
| 1364 case Event_RSUpdateEnd: | |
| 1365 str->print("RS Update End"); | |
| 1366 break; | |
| 1367 } | |
| 1368 } | |
| 1369 | |
| 1370 void HeapRegionRemSet::print_recorded() { | |
| 1371 int cur_evnt = 0; | |
| 1372 Event cur_evnt_kind; | |
| 1373 int cur_evnt_ind = 0; | |
| 1374 if (_n_recorded_events > 0) { | |
| 1375 cur_evnt_kind = _recorded_events[cur_evnt]; | |
| 1376 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
| 1377 } | |
| 1378 | |
| 1379 for (int i = 0; i < _n_recorded; i++) { | |
| 1380 while (cur_evnt < _n_recorded_events && i == cur_evnt_ind) { | |
| 1381 gclog_or_tty->print("Event: "); | |
| 1382 print_event(gclog_or_tty, cur_evnt_kind); | |
| 1383 gclog_or_tty->print_cr(""); | |
| 1384 cur_evnt++; | |
| 1385 if (cur_evnt < MaxRecordedEvents) { | |
| 1386 cur_evnt_kind = _recorded_events[cur_evnt]; | |
| 1387 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
| 1388 } | |
| 1389 } | |
| 1390 gclog_or_tty->print("Added card " PTR_FORMAT " to region [" PTR_FORMAT "...]" | |
| 1391 " for ref " PTR_FORMAT ".\n", | |
| 1392 _recorded_cards[i], _recorded_regions[i]->bottom(), | |
| 1393 _recorded_oops[i]); | |
| 1394 } | |
| 1395 } | |
| 1396 | |
| 1397 #ifndef PRODUCT | |
| 1398 void HeapRegionRemSet::test() { | |
| 1399 os::sleep(Thread::current(), (jlong)5000, false); | |
| 1400 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1401 | |
| 1402 // Run with "-XX:G1LogRSRegionEntries=2", so that 1 and 5 end up in same | |
| 1403 // hash bucket. | |
| 1404 HeapRegion* hr0 = g1h->region_at(0); | |
| 1405 HeapRegion* hr1 = g1h->region_at(1); | |
| 1406 HeapRegion* hr2 = g1h->region_at(5); | |
| 1407 HeapRegion* hr3 = g1h->region_at(6); | |
| 1408 HeapRegion* hr4 = g1h->region_at(7); | |
| 1409 HeapRegion* hr5 = g1h->region_at(8); | |
| 1410 | |
| 1411 HeapWord* hr1_start = hr1->bottom(); | |
| 1412 HeapWord* hr1_mid = hr1_start + HeapRegion::GrainWords/2; | |
| 1413 HeapWord* hr1_last = hr1->end() - 1; | |
| 1414 | |
| 1415 HeapWord* hr2_start = hr2->bottom(); | |
| 1416 HeapWord* hr2_mid = hr2_start + HeapRegion::GrainWords/2; | |
| 1417 HeapWord* hr2_last = hr2->end() - 1; | |
| 1418 | |
| 1419 HeapWord* hr3_start = hr3->bottom(); | |
| 1420 HeapWord* hr3_mid = hr3_start + HeapRegion::GrainWords/2; | |
| 1421 HeapWord* hr3_last = hr3->end() - 1; | |
| 1422 | |
| 1423 HeapRegionRemSet* hrrs = hr0->rem_set(); | |
| 1424 | |
| 1425 // Make three references from region 0x101... | |
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1426 hrrs->add_reference((OopOrNarrowOopStar)hr1_start); |
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1427 hrrs->add_reference((OopOrNarrowOopStar)hr1_mid); |
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1428 hrrs->add_reference((OopOrNarrowOopStar)hr1_last); |
| 342 | 1429 |
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1430 hrrs->add_reference((OopOrNarrowOopStar)hr2_start); |
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1431 hrrs->add_reference((OopOrNarrowOopStar)hr2_mid); |
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1432 hrrs->add_reference((OopOrNarrowOopStar)hr2_last); |
| 342 | 1433 |
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1434 hrrs->add_reference((OopOrNarrowOopStar)hr3_start); |
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1435 hrrs->add_reference((OopOrNarrowOopStar)hr3_mid); |
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1436 hrrs->add_reference((OopOrNarrowOopStar)hr3_last); |
| 342 | 1437 |
| 1438 // Now cause a coarsening. | |
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1439 hrrs->add_reference((OopOrNarrowOopStar)hr4->bottom()); |
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1440 hrrs->add_reference((OopOrNarrowOopStar)hr5->bottom()); |
| 342 | 1441 |
| 1442 // Now, does iteration yield these three? | |
| 1443 HeapRegionRemSetIterator iter; | |
| 1444 hrrs->init_iterator(&iter); | |
| 1445 size_t sum = 0; | |
| 1446 size_t card_index; | |
| 1447 while (iter.has_next(card_index)) { | |
| 1448 HeapWord* card_start = | |
| 1449 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
| 1450 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); | |
| 1451 sum++; | |
| 1452 } | |
| 1453 guarantee(sum == 11 - 3 + 2048, "Failure"); | |
| 1454 guarantee(sum == hrrs->occupied(), "Failure"); | |
| 1455 } | |
| 1456 #endif |