Fri, 18 Feb 2011 10:07:34 -0800
7020042: G1: Partially remove fix for 6994628
Summary: Disable reference discovery and processing during concurrent marking by disabling fix for 6994628.
Reviewed-by: tonyp, ysr
ysr@777 | 1 | /* |
tonyp@2493 | 2 | * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
ysr@777 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
ysr@777 | 4 | * |
ysr@777 | 5 | * This code is free software; you can redistribute it and/or modify it |
ysr@777 | 6 | * under the terms of the GNU General Public License version 2 only, as |
ysr@777 | 7 | * published by the Free Software Foundation. |
ysr@777 | 8 | * |
ysr@777 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
ysr@777 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
ysr@777 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
ysr@777 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
ysr@777 | 13 | * accompanied this code). |
ysr@777 | 14 | * |
ysr@777 | 15 | * You should have received a copy of the GNU General Public License version |
ysr@777 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
ysr@777 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
ysr@777 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
ysr@777 | 22 | * |
ysr@777 | 23 | */ |
ysr@777 | 24 | |
stefank@2314 | 25 | #include "precompiled.hpp" |
stefank@2314 | 26 | #include "gc_implementation/g1/concurrentG1Refine.hpp" |
stefank@2314 | 27 | #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" |
stefank@2314 | 28 | #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
stefank@2314 | 29 | #include "gc_implementation/g1/heapRegionRemSet.hpp" |
stefank@2314 | 30 | #include "gc_implementation/g1/heapRegionSeq.inline.hpp" |
stefank@2314 | 31 | #include "memory/allocation.hpp" |
stefank@2314 | 32 | #include "memory/space.inline.hpp" |
stefank@2314 | 33 | #include "utilities/bitMap.inline.hpp" |
stefank@2314 | 34 | #include "utilities/globalDefinitions.hpp" |
ysr@777 | 35 | |
ysr@777 | 36 | #define HRRS_VERBOSE 0 |
ysr@777 | 37 | |
ysr@777 | 38 | #define PRT_COUNT_OCCUPIED 1 |
ysr@777 | 39 | |
ysr@777 | 40 | // OtherRegionsTable |
ysr@777 | 41 | |
ysr@777 | 42 | class PerRegionTable: public CHeapObj { |
ysr@777 | 43 | friend class OtherRegionsTable; |
ysr@777 | 44 | friend class HeapRegionRemSetIterator; |
ysr@777 | 45 | |
ysr@777 | 46 | HeapRegion* _hr; |
ysr@777 | 47 | BitMap _bm; |
ysr@777 | 48 | #if PRT_COUNT_OCCUPIED |
ysr@777 | 49 | jint _occupied; |
ysr@777 | 50 | #endif |
ysr@777 | 51 | PerRegionTable* _next_free; |
ysr@777 | 52 | |
ysr@777 | 53 | PerRegionTable* next_free() { return _next_free; } |
ysr@777 | 54 | void set_next_free(PerRegionTable* prt) { _next_free = prt; } |
ysr@777 | 55 | |
ysr@777 | 56 | |
ysr@777 | 57 | static PerRegionTable* _free_list; |
ysr@777 | 58 | |
ysr@777 | 59 | #ifdef _MSC_VER |
ysr@777 | 60 | // For some reason even though the classes are marked as friend they are unable |
ysr@777 | 61 | // to access CardsPerRegion when private/protected. Only the windows c++ compiler |
ysr@777 | 62 | // says this Sun CC and linux gcc don't have a problem with access when private |
ysr@777 | 63 | |
ysr@777 | 64 | public: |
ysr@777 | 65 | |
ysr@777 | 66 | #endif // _MSC_VER |
ysr@777 | 67 | |
ysr@777 | 68 | protected: |
ysr@777 | 69 | // We need access in order to union things into the base table. |
ysr@777 | 70 | BitMap* bm() { return &_bm; } |
ysr@777 | 71 | |
apetrusenko@980 | 72 | #if PRT_COUNT_OCCUPIED |
ysr@777 | 73 | void recount_occupied() { |
ysr@777 | 74 | _occupied = (jint) bm()->count_one_bits(); |
ysr@777 | 75 | } |
apetrusenko@980 | 76 | #endif |
ysr@777 | 77 | |
ysr@777 | 78 | PerRegionTable(HeapRegion* hr) : |
ysr@777 | 79 | _hr(hr), |
ysr@777 | 80 | #if PRT_COUNT_OCCUPIED |
ysr@777 | 81 | _occupied(0), |
ysr@777 | 82 | #endif |
tonyp@1377 | 83 | _bm(HeapRegion::CardsPerRegion, false /* in-resource-area */) |
ysr@777 | 84 | {} |
ysr@777 | 85 | |
ysr@777 | 86 | static void free(PerRegionTable* prt) { |
ysr@777 | 87 | while (true) { |
ysr@777 | 88 | PerRegionTable* fl = _free_list; |
ysr@777 | 89 | prt->set_next_free(fl); |
ysr@777 | 90 | PerRegionTable* res = |
ysr@777 | 91 | (PerRegionTable*) |
ysr@777 | 92 | Atomic::cmpxchg_ptr(prt, &_free_list, fl); |
ysr@777 | 93 | if (res == fl) return; |
ysr@777 | 94 | } |
ysr@777 | 95 | ShouldNotReachHere(); |
ysr@777 | 96 | } |
ysr@777 | 97 | |
ysr@777 | 98 | static PerRegionTable* alloc(HeapRegion* hr) { |
ysr@777 | 99 | PerRegionTable* fl = _free_list; |
ysr@777 | 100 | while (fl != NULL) { |
ysr@777 | 101 | PerRegionTable* nxt = fl->next_free(); |
ysr@777 | 102 | PerRegionTable* res = |
ysr@777 | 103 | (PerRegionTable*) |
ysr@777 | 104 | Atomic::cmpxchg_ptr(nxt, &_free_list, fl); |
ysr@777 | 105 | if (res == fl) { |
ysr@777 | 106 | fl->init(hr); |
ysr@777 | 107 | return fl; |
ysr@777 | 108 | } else { |
ysr@777 | 109 | fl = _free_list; |
ysr@777 | 110 | } |
ysr@777 | 111 | } |
ysr@777 | 112 | assert(fl == NULL, "Loop condition."); |
ysr@777 | 113 | return new PerRegionTable(hr); |
ysr@777 | 114 | } |
ysr@777 | 115 | |
johnc@1242 | 116 | void add_card_work(CardIdx_t from_card, bool par) { |
ysr@777 | 117 | if (!_bm.at(from_card)) { |
ysr@777 | 118 | if (par) { |
ysr@777 | 119 | if (_bm.par_at_put(from_card, 1)) { |
ysr@777 | 120 | #if PRT_COUNT_OCCUPIED |
ysr@777 | 121 | Atomic::inc(&_occupied); |
ysr@777 | 122 | #endif |
ysr@777 | 123 | } |
ysr@777 | 124 | } else { |
ysr@777 | 125 | _bm.at_put(from_card, 1); |
ysr@777 | 126 | #if PRT_COUNT_OCCUPIED |
ysr@777 | 127 | _occupied++; |
ysr@777 | 128 | #endif |
ysr@777 | 129 | } |
ysr@777 | 130 | } |
ysr@777 | 131 | } |
ysr@777 | 132 | |
ysr@1280 | 133 | void add_reference_work(OopOrNarrowOopStar from, bool par) { |
ysr@777 | 134 | // Must make this robust in case "from" is not in "_hr", because of |
ysr@777 | 135 | // concurrency. |
ysr@777 | 136 | |
ysr@777 | 137 | #if HRRS_VERBOSE |
ysr@777 | 138 | gclog_or_tty->print_cr(" PRT::Add_reference_work(" PTR_FORMAT "->" PTR_FORMAT").", |
ysr@777 | 139 | from, *from); |
ysr@777 | 140 | #endif |
ysr@777 | 141 | |
ysr@777 | 142 | HeapRegion* loc_hr = hr(); |
ysr@777 | 143 | // If the test below fails, then this table was reused concurrently |
ysr@777 | 144 | // with this operation. This is OK, since the old table was coarsened, |
ysr@777 | 145 | // and adding a bit to the new table is never incorrect. |
ysr@777 | 146 | if (loc_hr->is_in_reserved(from)) { |
ysr@777 | 147 | size_t hw_offset = pointer_delta((HeapWord*)from, loc_hr->bottom()); |
johnc@1242 | 148 | CardIdx_t from_card = (CardIdx_t) |
johnc@1242 | 149 | hw_offset >> (CardTableModRefBS::card_shift - LogHeapWordSize); |
ysr@777 | 150 | |
tonyp@1377 | 151 | assert(0 <= from_card && from_card < HeapRegion::CardsPerRegion, |
tonyp@1377 | 152 | "Must be in range."); |
johnc@1242 | 153 | add_card_work(from_card, par); |
ysr@777 | 154 | } |
ysr@777 | 155 | } |
ysr@777 | 156 | |
ysr@777 | 157 | public: |
ysr@777 | 158 | |
ysr@777 | 159 | HeapRegion* hr() const { return _hr; } |
ysr@777 | 160 | |
ysr@777 | 161 | #if PRT_COUNT_OCCUPIED |
ysr@777 | 162 | jint occupied() const { |
ysr@777 | 163 | // Overkill, but if we ever need it... |
ysr@777 | 164 | // guarantee(_occupied == _bm.count_one_bits(), "Check"); |
ysr@777 | 165 | return _occupied; |
ysr@777 | 166 | } |
ysr@777 | 167 | #else |
ysr@777 | 168 | jint occupied() const { |
ysr@777 | 169 | return _bm.count_one_bits(); |
ysr@777 | 170 | } |
ysr@777 | 171 | #endif |
ysr@777 | 172 | |
ysr@777 | 173 | void init(HeapRegion* hr) { |
ysr@777 | 174 | _hr = hr; |
ysr@777 | 175 | #if PRT_COUNT_OCCUPIED |
ysr@777 | 176 | _occupied = 0; |
ysr@777 | 177 | #endif |
ysr@777 | 178 | _bm.clear(); |
ysr@777 | 179 | } |
ysr@777 | 180 | |
ysr@1280 | 181 | void add_reference(OopOrNarrowOopStar from) { |
ysr@777 | 182 | add_reference_work(from, /*parallel*/ true); |
ysr@777 | 183 | } |
ysr@777 | 184 | |
ysr@1280 | 185 | void seq_add_reference(OopOrNarrowOopStar from) { |
ysr@777 | 186 | add_reference_work(from, /*parallel*/ false); |
ysr@777 | 187 | } |
ysr@777 | 188 | |
ysr@777 | 189 | void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { |
ysr@777 | 190 | HeapWord* hr_bot = hr()->bottom(); |
swamyv@924 | 191 | size_t hr_first_card_index = ctbs->index_for(hr_bot); |
ysr@777 | 192 | bm()->set_intersection_at_offset(*card_bm, hr_first_card_index); |
ysr@777 | 193 | #if PRT_COUNT_OCCUPIED |
ysr@777 | 194 | recount_occupied(); |
ysr@777 | 195 | #endif |
ysr@777 | 196 | } |
ysr@777 | 197 | |
johnc@1242 | 198 | void add_card(CardIdx_t from_card_index) { |
ysr@777 | 199 | add_card_work(from_card_index, /*parallel*/ true); |
ysr@777 | 200 | } |
ysr@777 | 201 | |
johnc@1242 | 202 | void seq_add_card(CardIdx_t from_card_index) { |
ysr@777 | 203 | add_card_work(from_card_index, /*parallel*/ false); |
ysr@777 | 204 | } |
ysr@777 | 205 | |
ysr@777 | 206 | // (Destructively) union the bitmap of the current table into the given |
ysr@777 | 207 | // bitmap (which is assumed to be of the same size.) |
ysr@777 | 208 | void union_bitmap_into(BitMap* bm) { |
ysr@777 | 209 | bm->set_union(_bm); |
ysr@777 | 210 | } |
ysr@777 | 211 | |
ysr@777 | 212 | // Mem size in bytes. |
ysr@777 | 213 | size_t mem_size() const { |
ysr@777 | 214 | return sizeof(this) + _bm.size_in_words() * HeapWordSize; |
ysr@777 | 215 | } |
ysr@777 | 216 | |
ysr@777 | 217 | static size_t fl_mem_size() { |
ysr@777 | 218 | PerRegionTable* cur = _free_list; |
ysr@777 | 219 | size_t res = 0; |
ysr@777 | 220 | while (cur != NULL) { |
ysr@777 | 221 | res += sizeof(PerRegionTable); |
ysr@777 | 222 | cur = cur->next_free(); |
ysr@777 | 223 | } |
ysr@777 | 224 | return res; |
ysr@777 | 225 | } |
ysr@777 | 226 | |
ysr@777 | 227 | // Requires "from" to be in "hr()". |
ysr@1280 | 228 | bool contains_reference(OopOrNarrowOopStar from) const { |
ysr@777 | 229 | assert(hr()->is_in_reserved(from), "Precondition."); |
ysr@777 | 230 | size_t card_ind = pointer_delta(from, hr()->bottom(), |
ysr@777 | 231 | CardTableModRefBS::card_size); |
ysr@777 | 232 | return _bm.at(card_ind); |
ysr@777 | 233 | } |
ysr@777 | 234 | }; |
ysr@777 | 235 | |
ysr@777 | 236 | PerRegionTable* PerRegionTable::_free_list = NULL; |
ysr@777 | 237 | |
ysr@777 | 238 | |
ysr@777 | 239 | #define COUNT_PAR_EXPANDS 0 |
ysr@777 | 240 | |
ysr@777 | 241 | #if COUNT_PAR_EXPANDS |
ysr@777 | 242 | static jint n_par_expands = 0; |
ysr@777 | 243 | static jint n_par_contracts = 0; |
ysr@777 | 244 | static jint par_expand_list_len = 0; |
ysr@777 | 245 | static jint max_par_expand_list_len = 0; |
ysr@777 | 246 | |
ysr@777 | 247 | static void print_par_expand() { |
ysr@777 | 248 | Atomic::inc(&n_par_expands); |
ysr@777 | 249 | Atomic::inc(&par_expand_list_len); |
ysr@777 | 250 | if (par_expand_list_len > max_par_expand_list_len) { |
ysr@777 | 251 | max_par_expand_list_len = par_expand_list_len; |
ysr@777 | 252 | } |
ysr@777 | 253 | if ((n_par_expands % 10) == 0) { |
ysr@777 | 254 | gclog_or_tty->print_cr("\n\n%d par expands: %d contracts, " |
ysr@777 | 255 | "len = %d, max_len = %d\n.", |
ysr@777 | 256 | n_par_expands, n_par_contracts, par_expand_list_len, |
ysr@777 | 257 | max_par_expand_list_len); |
ysr@777 | 258 | } |
ysr@777 | 259 | } |
ysr@777 | 260 | #endif |
ysr@777 | 261 | |
ysr@777 | 262 | class PosParPRT: public PerRegionTable { |
ysr@777 | 263 | PerRegionTable** _par_tables; |
ysr@777 | 264 | |
ysr@777 | 265 | enum SomePrivateConstants { |
ysr@777 | 266 | ReserveParTableExpansion = 1 |
ysr@777 | 267 | }; |
ysr@777 | 268 | |
ysr@777 | 269 | void par_contract() { |
ysr@777 | 270 | assert(_par_tables != NULL, "Precondition."); |
ysr@777 | 271 | int n = HeapRegionRemSet::num_par_rem_sets()-1; |
ysr@777 | 272 | for (int i = 0; i < n; i++) { |
ysr@777 | 273 | _par_tables[i]->union_bitmap_into(bm()); |
ysr@777 | 274 | PerRegionTable::free(_par_tables[i]); |
ysr@777 | 275 | _par_tables[i] = NULL; |
ysr@777 | 276 | } |
ysr@777 | 277 | #if PRT_COUNT_OCCUPIED |
ysr@777 | 278 | // We must recount the "occupied." |
ysr@777 | 279 | recount_occupied(); |
ysr@777 | 280 | #endif |
ysr@777 | 281 | FREE_C_HEAP_ARRAY(PerRegionTable*, _par_tables); |
ysr@777 | 282 | _par_tables = NULL; |
ysr@777 | 283 | #if COUNT_PAR_EXPANDS |
ysr@777 | 284 | Atomic::inc(&n_par_contracts); |
ysr@777 | 285 | Atomic::dec(&par_expand_list_len); |
ysr@777 | 286 | #endif |
ysr@777 | 287 | } |
ysr@777 | 288 | |
ysr@777 | 289 | static PerRegionTable** _par_table_fl; |
ysr@777 | 290 | |
ysr@777 | 291 | PosParPRT* _next; |
ysr@777 | 292 | |
ysr@777 | 293 | static PosParPRT* _free_list; |
ysr@777 | 294 | |
ysr@777 | 295 | PerRegionTable** par_tables() const { |
ysr@777 | 296 | assert(uintptr_t(NULL) == 0, "Assumption."); |
ysr@777 | 297 | if (uintptr_t(_par_tables) <= ReserveParTableExpansion) |
ysr@777 | 298 | return NULL; |
ysr@777 | 299 | else |
ysr@777 | 300 | return _par_tables; |
ysr@777 | 301 | } |
ysr@777 | 302 | |
ysr@777 | 303 | PosParPRT* _next_par_expanded; |
ysr@777 | 304 | PosParPRT* next_par_expanded() { return _next_par_expanded; } |
ysr@777 | 305 | void set_next_par_expanded(PosParPRT* ppprt) { _next_par_expanded = ppprt; } |
ysr@777 | 306 | static PosParPRT* _par_expanded_list; |
ysr@777 | 307 | |
ysr@777 | 308 | public: |
ysr@777 | 309 | |
ysr@777 | 310 | PosParPRT(HeapRegion* hr) : PerRegionTable(hr), _par_tables(NULL) {} |
ysr@777 | 311 | |
ysr@777 | 312 | jint occupied() const { |
ysr@777 | 313 | jint res = PerRegionTable::occupied(); |
ysr@777 | 314 | if (par_tables() != NULL) { |
ysr@777 | 315 | for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { |
ysr@777 | 316 | res += par_tables()[i]->occupied(); |
ysr@777 | 317 | } |
ysr@777 | 318 | } |
ysr@777 | 319 | return res; |
ysr@777 | 320 | } |
ysr@777 | 321 | |
ysr@777 | 322 | void init(HeapRegion* hr) { |
ysr@777 | 323 | PerRegionTable::init(hr); |
ysr@777 | 324 | _next = NULL; |
ysr@777 | 325 | if (par_tables() != NULL) { |
ysr@777 | 326 | for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { |
ysr@777 | 327 | par_tables()[i]->init(hr); |
ysr@777 | 328 | } |
ysr@777 | 329 | } |
ysr@777 | 330 | } |
ysr@777 | 331 | |
ysr@777 | 332 | static void free(PosParPRT* prt) { |
ysr@777 | 333 | while (true) { |
ysr@777 | 334 | PosParPRT* fl = _free_list; |
ysr@777 | 335 | prt->set_next(fl); |
ysr@777 | 336 | PosParPRT* res = |
ysr@777 | 337 | (PosParPRT*) |
ysr@777 | 338 | Atomic::cmpxchg_ptr(prt, &_free_list, fl); |
ysr@777 | 339 | if (res == fl) return; |
ysr@777 | 340 | } |
ysr@777 | 341 | ShouldNotReachHere(); |
ysr@777 | 342 | } |
ysr@777 | 343 | |
ysr@777 | 344 | static PosParPRT* alloc(HeapRegion* hr) { |
ysr@777 | 345 | PosParPRT* fl = _free_list; |
ysr@777 | 346 | while (fl != NULL) { |
ysr@777 | 347 | PosParPRT* nxt = fl->next(); |
ysr@777 | 348 | PosParPRT* res = |
ysr@777 | 349 | (PosParPRT*) |
ysr@777 | 350 | Atomic::cmpxchg_ptr(nxt, &_free_list, fl); |
ysr@777 | 351 | if (res == fl) { |
ysr@777 | 352 | fl->init(hr); |
ysr@777 | 353 | return fl; |
ysr@777 | 354 | } else { |
ysr@777 | 355 | fl = _free_list; |
ysr@777 | 356 | } |
ysr@777 | 357 | } |
ysr@777 | 358 | assert(fl == NULL, "Loop condition."); |
ysr@777 | 359 | return new PosParPRT(hr); |
ysr@777 | 360 | } |
ysr@777 | 361 | |
ysr@777 | 362 | PosParPRT* next() const { return _next; } |
ysr@777 | 363 | void set_next(PosParPRT* nxt) { _next = nxt; } |
ysr@777 | 364 | PosParPRT** next_addr() { return &_next; } |
ysr@777 | 365 | |
tonyp@1694 | 366 | bool should_expand(int tid) { |
tonyp@1694 | 367 | return par_tables() == NULL && tid > 0 && hr()->is_gc_alloc_region(); |
tonyp@1694 | 368 | } |
tonyp@1694 | 369 | |
tonyp@1694 | 370 | void par_expand() { |
tonyp@1694 | 371 | int n = HeapRegionRemSet::num_par_rem_sets()-1; |
tonyp@1694 | 372 | if (n <= 0) return; |
tonyp@1694 | 373 | if (_par_tables == NULL) { |
tonyp@1694 | 374 | PerRegionTable* res = |
tonyp@1694 | 375 | (PerRegionTable*) |
tonyp@1694 | 376 | Atomic::cmpxchg_ptr((PerRegionTable*)ReserveParTableExpansion, |
tonyp@1694 | 377 | &_par_tables, NULL); |
tonyp@1694 | 378 | if (res != NULL) return; |
tonyp@1694 | 379 | // Otherwise, we reserved the right to do the expansion. |
tonyp@1694 | 380 | |
tonyp@1694 | 381 | PerRegionTable** ptables = NEW_C_HEAP_ARRAY(PerRegionTable*, n); |
tonyp@1694 | 382 | for (int i = 0; i < n; i++) { |
tonyp@1694 | 383 | PerRegionTable* ptable = PerRegionTable::alloc(hr()); |
tonyp@1694 | 384 | ptables[i] = ptable; |
tonyp@1694 | 385 | } |
tonyp@1694 | 386 | // Here we do not need an atomic. |
tonyp@1694 | 387 | _par_tables = ptables; |
tonyp@1694 | 388 | #if COUNT_PAR_EXPANDS |
tonyp@1694 | 389 | print_par_expand(); |
tonyp@1694 | 390 | #endif |
tonyp@1694 | 391 | // We must put this table on the expanded list. |
tonyp@1694 | 392 | PosParPRT* exp_head = _par_expanded_list; |
tonyp@1694 | 393 | while (true) { |
tonyp@1694 | 394 | set_next_par_expanded(exp_head); |
tonyp@1694 | 395 | PosParPRT* res = |
tonyp@1694 | 396 | (PosParPRT*) |
tonyp@1694 | 397 | Atomic::cmpxchg_ptr(this, &_par_expanded_list, exp_head); |
tonyp@1694 | 398 | if (res == exp_head) return; |
tonyp@1694 | 399 | // Otherwise. |
tonyp@1694 | 400 | exp_head = res; |
tonyp@1694 | 401 | } |
tonyp@1694 | 402 | ShouldNotReachHere(); |
tonyp@1694 | 403 | } |
tonyp@1694 | 404 | } |
tonyp@1694 | 405 | |
ysr@1280 | 406 | void add_reference(OopOrNarrowOopStar from, int tid) { |
ysr@777 | 407 | // Expand if necessary. |
ysr@777 | 408 | PerRegionTable** pt = par_tables(); |
ysr@777 | 409 | if (pt != NULL) { |
ysr@777 | 410 | // We always have to assume that mods to table 0 are in parallel, |
ysr@777 | 411 | // because of the claiming scheme in parallel expansion. A thread |
ysr@777 | 412 | // with tid != 0 that finds the table to be NULL, but doesn't succeed |
ysr@777 | 413 | // in claiming the right of expanding it, will end up in the else |
ysr@777 | 414 | // clause of the above if test. That thread could be delayed, and a |
ysr@777 | 415 | // thread 0 add reference could see the table expanded, and come |
ysr@777 | 416 | // here. Both threads would be adding in parallel. But we get to |
ysr@777 | 417 | // not use atomics for tids > 0. |
ysr@777 | 418 | if (tid == 0) { |
ysr@777 | 419 | PerRegionTable::add_reference(from); |
ysr@777 | 420 | } else { |
ysr@777 | 421 | pt[tid-1]->seq_add_reference(from); |
ysr@777 | 422 | } |
ysr@777 | 423 | } else { |
ysr@777 | 424 | // Not expanded -- add to the base table. |
ysr@777 | 425 | PerRegionTable::add_reference(from); |
ysr@777 | 426 | } |
ysr@777 | 427 | } |
ysr@777 | 428 | |
ysr@777 | 429 | void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { |
ysr@777 | 430 | assert(_par_tables == NULL, "Precondition"); |
ysr@777 | 431 | PerRegionTable::scrub(ctbs, card_bm); |
ysr@777 | 432 | } |
ysr@777 | 433 | |
ysr@777 | 434 | size_t mem_size() const { |
ysr@777 | 435 | size_t res = |
ysr@777 | 436 | PerRegionTable::mem_size() + sizeof(this) - sizeof(PerRegionTable); |
ysr@777 | 437 | if (_par_tables != NULL) { |
ysr@777 | 438 | for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { |
ysr@777 | 439 | res += _par_tables[i]->mem_size(); |
ysr@777 | 440 | } |
ysr@777 | 441 | } |
ysr@777 | 442 | return res; |
ysr@777 | 443 | } |
ysr@777 | 444 | |
ysr@777 | 445 | static size_t fl_mem_size() { |
ysr@777 | 446 | PosParPRT* cur = _free_list; |
ysr@777 | 447 | size_t res = 0; |
ysr@777 | 448 | while (cur != NULL) { |
ysr@777 | 449 | res += sizeof(PosParPRT); |
ysr@777 | 450 | cur = cur->next(); |
ysr@777 | 451 | } |
ysr@777 | 452 | return res; |
ysr@777 | 453 | } |
ysr@777 | 454 | |
ysr@1280 | 455 | bool contains_reference(OopOrNarrowOopStar from) const { |
ysr@777 | 456 | if (PerRegionTable::contains_reference(from)) return true; |
ysr@777 | 457 | if (_par_tables != NULL) { |
ysr@777 | 458 | for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) { |
ysr@777 | 459 | if (_par_tables[i]->contains_reference(from)) return true; |
ysr@777 | 460 | } |
ysr@777 | 461 | } |
ysr@777 | 462 | return false; |
ysr@777 | 463 | } |
ysr@777 | 464 | |
ysr@777 | 465 | static void par_contract_all(); |
ysr@777 | 466 | }; |
ysr@777 | 467 | |
ysr@777 | 468 | void PosParPRT::par_contract_all() { |
ysr@777 | 469 | PosParPRT* hd = _par_expanded_list; |
ysr@777 | 470 | while (hd != NULL) { |
ysr@777 | 471 | PosParPRT* nxt = hd->next_par_expanded(); |
ysr@777 | 472 | PosParPRT* res = |
ysr@777 | 473 | (PosParPRT*) |
ysr@777 | 474 | Atomic::cmpxchg_ptr(nxt, &_par_expanded_list, hd); |
ysr@777 | 475 | if (res == hd) { |
ysr@777 | 476 | // We claimed the right to contract this table. |
ysr@777 | 477 | hd->set_next_par_expanded(NULL); |
ysr@777 | 478 | hd->par_contract(); |
ysr@777 | 479 | hd = _par_expanded_list; |
ysr@777 | 480 | } else { |
ysr@777 | 481 | hd = res; |
ysr@777 | 482 | } |
ysr@777 | 483 | } |
ysr@777 | 484 | } |
ysr@777 | 485 | |
ysr@777 | 486 | PosParPRT* PosParPRT::_free_list = NULL; |
ysr@777 | 487 | PosParPRT* PosParPRT::_par_expanded_list = NULL; |
ysr@777 | 488 | |
ysr@777 | 489 | jint OtherRegionsTable::_cache_probes = 0; |
ysr@777 | 490 | jint OtherRegionsTable::_cache_hits = 0; |
ysr@777 | 491 | |
ysr@777 | 492 | size_t OtherRegionsTable::_max_fine_entries = 0; |
ysr@777 | 493 | size_t OtherRegionsTable::_mod_max_fine_entries_mask = 0; |
ysr@777 | 494 | #if SAMPLE_FOR_EVICTION |
ysr@777 | 495 | size_t OtherRegionsTable::_fine_eviction_stride = 0; |
ysr@777 | 496 | size_t OtherRegionsTable::_fine_eviction_sample_size = 0; |
ysr@777 | 497 | #endif |
ysr@777 | 498 | |
ysr@777 | 499 | OtherRegionsTable::OtherRegionsTable(HeapRegion* hr) : |
ysr@777 | 500 | _g1h(G1CollectedHeap::heap()), |
ysr@777 | 501 | _m(Mutex::leaf, "An OtherRegionsTable lock", true), |
ysr@777 | 502 | _hr(hr), |
ysr@777 | 503 | _coarse_map(G1CollectedHeap::heap()->max_regions(), |
ysr@777 | 504 | false /* in-resource-area */), |
ysr@777 | 505 | _fine_grain_regions(NULL), |
ysr@777 | 506 | _n_fine_entries(0), _n_coarse_entries(0), |
ysr@777 | 507 | #if SAMPLE_FOR_EVICTION |
ysr@777 | 508 | _fine_eviction_start(0), |
ysr@777 | 509 | #endif |
ysr@777 | 510 | _sparse_table(hr) |
ysr@777 | 511 | { |
ysr@777 | 512 | typedef PosParPRT* PosParPRTPtr; |
ysr@777 | 513 | if (_max_fine_entries == 0) { |
ysr@777 | 514 | assert(_mod_max_fine_entries_mask == 0, "Both or none."); |
iveresov@1696 | 515 | size_t max_entries_log = (size_t)log2_long((jlong)G1RSetRegionEntries); |
iveresov@1696 | 516 | _max_fine_entries = (size_t)(1 << max_entries_log); |
ysr@777 | 517 | _mod_max_fine_entries_mask = _max_fine_entries - 1; |
ysr@777 | 518 | #if SAMPLE_FOR_EVICTION |
ysr@777 | 519 | assert(_fine_eviction_sample_size == 0 |
ysr@777 | 520 | && _fine_eviction_stride == 0, "All init at same time."); |
iveresov@1696 | 521 | _fine_eviction_sample_size = MAX2((size_t)4, max_entries_log); |
ysr@777 | 522 | _fine_eviction_stride = _max_fine_entries / _fine_eviction_sample_size; |
ysr@777 | 523 | #endif |
ysr@777 | 524 | } |
ysr@777 | 525 | _fine_grain_regions = new PosParPRTPtr[_max_fine_entries]; |
ysr@777 | 526 | if (_fine_grain_regions == NULL) |
ysr@777 | 527 | vm_exit_out_of_memory(sizeof(void*)*_max_fine_entries, |
ysr@777 | 528 | "Failed to allocate _fine_grain_entries."); |
ysr@777 | 529 | for (size_t i = 0; i < _max_fine_entries; i++) { |
ysr@777 | 530 | _fine_grain_regions[i] = NULL; |
ysr@777 | 531 | } |
ysr@777 | 532 | } |
ysr@777 | 533 | |
ysr@777 | 534 | int** OtherRegionsTable::_from_card_cache = NULL; |
ysr@777 | 535 | size_t OtherRegionsTable::_from_card_cache_max_regions = 0; |
ysr@777 | 536 | size_t OtherRegionsTable::_from_card_cache_mem_size = 0; |
ysr@777 | 537 | |
ysr@777 | 538 | void OtherRegionsTable::init_from_card_cache(size_t max_regions) { |
ysr@777 | 539 | _from_card_cache_max_regions = max_regions; |
ysr@777 | 540 | |
ysr@777 | 541 | int n_par_rs = HeapRegionRemSet::num_par_rem_sets(); |
ysr@777 | 542 | _from_card_cache = NEW_C_HEAP_ARRAY(int*, n_par_rs); |
ysr@777 | 543 | for (int i = 0; i < n_par_rs; i++) { |
ysr@777 | 544 | _from_card_cache[i] = NEW_C_HEAP_ARRAY(int, max_regions); |
ysr@777 | 545 | for (size_t j = 0; j < max_regions; j++) { |
ysr@777 | 546 | _from_card_cache[i][j] = -1; // An invalid value. |
ysr@777 | 547 | } |
ysr@777 | 548 | } |
ysr@777 | 549 | _from_card_cache_mem_size = n_par_rs * max_regions * sizeof(int); |
ysr@777 | 550 | } |
ysr@777 | 551 | |
ysr@777 | 552 | void OtherRegionsTable::shrink_from_card_cache(size_t new_n_regs) { |
ysr@777 | 553 | for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { |
ysr@777 | 554 | assert(new_n_regs <= _from_card_cache_max_regions, "Must be within max."); |
ysr@777 | 555 | for (size_t j = new_n_regs; j < _from_card_cache_max_regions; j++) { |
ysr@777 | 556 | _from_card_cache[i][j] = -1; // An invalid value. |
ysr@777 | 557 | } |
ysr@777 | 558 | } |
ysr@777 | 559 | } |
ysr@777 | 560 | |
ysr@777 | 561 | #ifndef PRODUCT |
ysr@777 | 562 | void OtherRegionsTable::print_from_card_cache() { |
ysr@777 | 563 | for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { |
ysr@777 | 564 | for (size_t j = 0; j < _from_card_cache_max_regions; j++) { |
ysr@777 | 565 | gclog_or_tty->print_cr("_from_card_cache[%d][%d] = %d.", |
ysr@777 | 566 | i, j, _from_card_cache[i][j]); |
ysr@777 | 567 | } |
ysr@777 | 568 | } |
ysr@777 | 569 | } |
ysr@777 | 570 | #endif |
ysr@777 | 571 | |
ysr@1280 | 572 | void OtherRegionsTable::add_reference(OopOrNarrowOopStar from, int tid) { |
ysr@777 | 573 | size_t cur_hrs_ind = hr()->hrs_index(); |
ysr@777 | 574 | |
ysr@777 | 575 | #if HRRS_VERBOSE |
ysr@777 | 576 | gclog_or_tty->print_cr("ORT::add_reference_work(" PTR_FORMAT "->" PTR_FORMAT ").", |
ysr@1280 | 577 | from, |
ysr@1280 | 578 | UseCompressedOops |
ysr@1280 | 579 | ? oopDesc::load_decode_heap_oop((narrowOop*)from) |
ysr@1280 | 580 | : oopDesc::load_decode_heap_oop((oop*)from)); |
ysr@777 | 581 | #endif |
ysr@777 | 582 | |
ysr@777 | 583 | int from_card = (int)(uintptr_t(from) >> CardTableModRefBS::card_shift); |
ysr@777 | 584 | |
ysr@777 | 585 | #if HRRS_VERBOSE |
ysr@777 | 586 | gclog_or_tty->print_cr("Table for [" PTR_FORMAT "...): card %d (cache = %d)", |
ysr@777 | 587 | hr()->bottom(), from_card, |
ysr@777 | 588 | _from_card_cache[tid][cur_hrs_ind]); |
ysr@777 | 589 | #endif |
ysr@777 | 590 | |
ysr@777 | 591 | #define COUNT_CACHE 0 |
ysr@777 | 592 | #if COUNT_CACHE |
ysr@777 | 593 | jint p = Atomic::add(1, &_cache_probes); |
ysr@777 | 594 | if ((p % 10000) == 0) { |
ysr@777 | 595 | jint hits = _cache_hits; |
ysr@777 | 596 | gclog_or_tty->print_cr("%d/%d = %5.2f%% RS cache hits.", |
ysr@777 | 597 | _cache_hits, p, 100.0* (float)hits/(float)p); |
ysr@777 | 598 | } |
ysr@777 | 599 | #endif |
ysr@777 | 600 | if (from_card == _from_card_cache[tid][cur_hrs_ind]) { |
ysr@777 | 601 | #if HRRS_VERBOSE |
ysr@777 | 602 | gclog_or_tty->print_cr(" from-card cache hit."); |
ysr@777 | 603 | #endif |
ysr@777 | 604 | #if COUNT_CACHE |
ysr@777 | 605 | Atomic::inc(&_cache_hits); |
ysr@777 | 606 | #endif |
ysr@777 | 607 | assert(contains_reference(from), "We just added it!"); |
ysr@777 | 608 | return; |
ysr@777 | 609 | } else { |
ysr@777 | 610 | _from_card_cache[tid][cur_hrs_ind] = from_card; |
ysr@777 | 611 | } |
ysr@777 | 612 | |
ysr@777 | 613 | // Note that this may be a continued H region. |
ysr@777 | 614 | HeapRegion* from_hr = _g1h->heap_region_containing_raw(from); |
johnc@1242 | 615 | RegionIdx_t from_hrs_ind = (RegionIdx_t) from_hr->hrs_index(); |
ysr@777 | 616 | |
ysr@777 | 617 | // If the region is already coarsened, return. |
ysr@777 | 618 | if (_coarse_map.at(from_hrs_ind)) { |
ysr@777 | 619 | #if HRRS_VERBOSE |
ysr@777 | 620 | gclog_or_tty->print_cr(" coarse map hit."); |
ysr@777 | 621 | #endif |
ysr@777 | 622 | assert(contains_reference(from), "We just added it!"); |
ysr@777 | 623 | return; |
ysr@777 | 624 | } |
ysr@777 | 625 | |
ysr@777 | 626 | // Otherwise find a per-region table to add it to. |
ysr@777 | 627 | size_t ind = from_hrs_ind & _mod_max_fine_entries_mask; |
ysr@777 | 628 | PosParPRT* prt = find_region_table(ind, from_hr); |
ysr@777 | 629 | if (prt == NULL) { |
ysr@777 | 630 | MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); |
ysr@777 | 631 | // Confirm that it's really not there... |
ysr@777 | 632 | prt = find_region_table(ind, from_hr); |
ysr@777 | 633 | if (prt == NULL) { |
ysr@777 | 634 | |
ysr@777 | 635 | uintptr_t from_hr_bot_card_index = |
ysr@777 | 636 | uintptr_t(from_hr->bottom()) |
ysr@777 | 637 | >> CardTableModRefBS::card_shift; |
johnc@1242 | 638 | CardIdx_t card_index = from_card - from_hr_bot_card_index; |
tonyp@1377 | 639 | assert(0 <= card_index && card_index < HeapRegion::CardsPerRegion, |
ysr@777 | 640 | "Must be in range."); |
ysr@777 | 641 | if (G1HRRSUseSparseTable && |
johnc@1242 | 642 | _sparse_table.add_card(from_hrs_ind, card_index)) { |
ysr@777 | 643 | if (G1RecordHRRSOops) { |
ysr@777 | 644 | HeapRegionRemSet::record(hr(), from); |
ysr@777 | 645 | #if HRRS_VERBOSE |
ysr@777 | 646 | gclog_or_tty->print(" Added card " PTR_FORMAT " to region " |
ysr@777 | 647 | "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
ysr@777 | 648 | align_size_down(uintptr_t(from), |
ysr@777 | 649 | CardTableModRefBS::card_size), |
ysr@777 | 650 | hr()->bottom(), from); |
ysr@777 | 651 | #endif |
ysr@777 | 652 | } |
ysr@777 | 653 | #if HRRS_VERBOSE |
ysr@777 | 654 | gclog_or_tty->print_cr(" added card to sparse table."); |
ysr@777 | 655 | #endif |
ysr@777 | 656 | assert(contains_reference_locked(from), "We just added it!"); |
ysr@777 | 657 | return; |
ysr@777 | 658 | } else { |
ysr@777 | 659 | #if HRRS_VERBOSE |
ysr@777 | 660 | gclog_or_tty->print_cr(" [tid %d] sparse table entry " |
ysr@777 | 661 | "overflow(f: %d, t: %d)", |
ysr@777 | 662 | tid, from_hrs_ind, cur_hrs_ind); |
ysr@777 | 663 | #endif |
ysr@777 | 664 | } |
ysr@777 | 665 | |
ysr@777 | 666 | if (_n_fine_entries == _max_fine_entries) { |
ysr@777 | 667 | prt = delete_region_table(); |
ysr@777 | 668 | } else { |
ysr@777 | 669 | prt = PosParPRT::alloc(from_hr); |
ysr@777 | 670 | } |
ysr@777 | 671 | prt->init(from_hr); |
ysr@777 | 672 | |
ysr@777 | 673 | PosParPRT* first_prt = _fine_grain_regions[ind]; |
ysr@777 | 674 | prt->set_next(first_prt); // XXX Maybe move to init? |
ysr@777 | 675 | _fine_grain_regions[ind] = prt; |
ysr@777 | 676 | _n_fine_entries++; |
ysr@777 | 677 | |
ysr@777 | 678 | if (G1HRRSUseSparseTable) { |
iveresov@1696 | 679 | // Transfer from sparse to fine-grain. |
iveresov@1696 | 680 | SparsePRTEntry *sprt_entry = _sparse_table.get_entry(from_hrs_ind); |
iveresov@1696 | 681 | assert(sprt_entry != NULL, "There should have been an entry"); |
iveresov@1696 | 682 | for (int i = 0; i < SparsePRTEntry::cards_num(); i++) { |
iveresov@1696 | 683 | CardIdx_t c = sprt_entry->card(i); |
ysr@777 | 684 | if (c != SparsePRTEntry::NullEntry) { |
ysr@777 | 685 | prt->add_card(c); |
ysr@777 | 686 | } |
ysr@777 | 687 | } |
ysr@777 | 688 | // Now we can delete the sparse entry. |
johnc@1242 | 689 | bool res = _sparse_table.delete_entry(from_hrs_ind); |
ysr@777 | 690 | assert(res, "It should have been there."); |
ysr@777 | 691 | } |
ysr@777 | 692 | } |
ysr@777 | 693 | assert(prt != NULL && prt->hr() == from_hr, "consequence"); |
ysr@777 | 694 | } |
ysr@777 | 695 | // Note that we can't assert "prt->hr() == from_hr", because of the |
ysr@777 | 696 | // possibility of concurrent reuse. But see head comment of |
ysr@777 | 697 | // OtherRegionsTable for why this is OK. |
ysr@777 | 698 | assert(prt != NULL, "Inv"); |
ysr@777 | 699 | |
tonyp@1694 | 700 | if (prt->should_expand(tid)) { |
tonyp@1694 | 701 | MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); |
tonyp@1694 | 702 | HeapRegion* prt_hr = prt->hr(); |
tonyp@1694 | 703 | if (prt_hr == from_hr) { |
tonyp@1694 | 704 | // Make sure the table still corresponds to the same region |
tonyp@1694 | 705 | prt->par_expand(); |
tonyp@1694 | 706 | prt->add_reference(from, tid); |
tonyp@1694 | 707 | } |
tonyp@1694 | 708 | // else: The table has been concurrently coarsened, evicted, and |
tonyp@1694 | 709 | // the table data structure re-used for another table. So, we |
tonyp@1694 | 710 | // don't need to add the reference any more given that the table |
tonyp@1694 | 711 | // has been coarsened and the whole region will be scanned anyway. |
tonyp@1694 | 712 | } else { |
tonyp@1694 | 713 | prt->add_reference(from, tid); |
tonyp@1694 | 714 | } |
ysr@777 | 715 | if (G1RecordHRRSOops) { |
ysr@777 | 716 | HeapRegionRemSet::record(hr(), from); |
ysr@777 | 717 | #if HRRS_VERBOSE |
ysr@777 | 718 | gclog_or_tty->print("Added card " PTR_FORMAT " to region " |
ysr@777 | 719 | "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
ysr@777 | 720 | align_size_down(uintptr_t(from), |
ysr@777 | 721 | CardTableModRefBS::card_size), |
ysr@777 | 722 | hr()->bottom(), from); |
ysr@777 | 723 | #endif |
ysr@777 | 724 | } |
ysr@777 | 725 | assert(contains_reference(from), "We just added it!"); |
ysr@777 | 726 | } |
ysr@777 | 727 | |
ysr@777 | 728 | PosParPRT* |
ysr@777 | 729 | OtherRegionsTable::find_region_table(size_t ind, HeapRegion* hr) const { |
ysr@777 | 730 | assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); |
ysr@777 | 731 | PosParPRT* prt = _fine_grain_regions[ind]; |
ysr@777 | 732 | while (prt != NULL && prt->hr() != hr) { |
ysr@777 | 733 | prt = prt->next(); |
ysr@777 | 734 | } |
ysr@777 | 735 | // Loop postcondition is the method postcondition. |
ysr@777 | 736 | return prt; |
ysr@777 | 737 | } |
ysr@777 | 738 | |
ysr@777 | 739 | |
ysr@777 | 740 | #define DRT_CENSUS 0 |
ysr@777 | 741 | |
ysr@777 | 742 | #if DRT_CENSUS |
ysr@777 | 743 | static const int HistoSize = 6; |
ysr@777 | 744 | static int global_histo[HistoSize] = { 0, 0, 0, 0, 0, 0 }; |
ysr@777 | 745 | static int coarsenings = 0; |
ysr@777 | 746 | static int occ_sum = 0; |
ysr@777 | 747 | #endif |
ysr@777 | 748 | |
ysr@777 | 749 | jint OtherRegionsTable::_n_coarsenings = 0; |
ysr@777 | 750 | |
ysr@777 | 751 | PosParPRT* OtherRegionsTable::delete_region_table() { |
ysr@777 | 752 | #if DRT_CENSUS |
ysr@777 | 753 | int histo[HistoSize] = { 0, 0, 0, 0, 0, 0 }; |
ysr@777 | 754 | const int histo_limits[] = { 1, 4, 16, 64, 256, 2048 }; |
ysr@777 | 755 | #endif |
ysr@777 | 756 | |
ysr@777 | 757 | assert(_m.owned_by_self(), "Precondition"); |
ysr@777 | 758 | assert(_n_fine_entries == _max_fine_entries, "Precondition"); |
ysr@777 | 759 | PosParPRT* max = NULL; |
ysr@777 | 760 | jint max_occ = 0; |
ysr@777 | 761 | PosParPRT** max_prev; |
ysr@777 | 762 | size_t max_ind; |
ysr@777 | 763 | |
ysr@777 | 764 | #if SAMPLE_FOR_EVICTION |
ysr@777 | 765 | size_t i = _fine_eviction_start; |
ysr@777 | 766 | for (size_t k = 0; k < _fine_eviction_sample_size; k++) { |
ysr@777 | 767 | size_t ii = i; |
ysr@777 | 768 | // Make sure we get a non-NULL sample. |
ysr@777 | 769 | while (_fine_grain_regions[ii] == NULL) { |
ysr@777 | 770 | ii++; |
ysr@777 | 771 | if (ii == _max_fine_entries) ii = 0; |
ysr@777 | 772 | guarantee(ii != i, "We must find one."); |
ysr@777 | 773 | } |
ysr@777 | 774 | PosParPRT** prev = &_fine_grain_regions[ii]; |
ysr@777 | 775 | PosParPRT* cur = *prev; |
ysr@777 | 776 | while (cur != NULL) { |
ysr@777 | 777 | jint cur_occ = cur->occupied(); |
ysr@777 | 778 | if (max == NULL || cur_occ > max_occ) { |
ysr@777 | 779 | max = cur; |
ysr@777 | 780 | max_prev = prev; |
ysr@777 | 781 | max_ind = i; |
ysr@777 | 782 | max_occ = cur_occ; |
ysr@777 | 783 | } |
ysr@777 | 784 | prev = cur->next_addr(); |
ysr@777 | 785 | cur = cur->next(); |
ysr@777 | 786 | } |
ysr@777 | 787 | i = i + _fine_eviction_stride; |
ysr@777 | 788 | if (i >= _n_fine_entries) i = i - _n_fine_entries; |
ysr@777 | 789 | } |
ysr@777 | 790 | _fine_eviction_start++; |
ysr@777 | 791 | if (_fine_eviction_start >= _n_fine_entries) |
ysr@777 | 792 | _fine_eviction_start -= _n_fine_entries; |
ysr@777 | 793 | #else |
ysr@777 | 794 | for (int i = 0; i < _max_fine_entries; i++) { |
ysr@777 | 795 | PosParPRT** prev = &_fine_grain_regions[i]; |
ysr@777 | 796 | PosParPRT* cur = *prev; |
ysr@777 | 797 | while (cur != NULL) { |
ysr@777 | 798 | jint cur_occ = cur->occupied(); |
ysr@777 | 799 | #if DRT_CENSUS |
ysr@777 | 800 | for (int k = 0; k < HistoSize; k++) { |
ysr@777 | 801 | if (cur_occ <= histo_limits[k]) { |
ysr@777 | 802 | histo[k]++; global_histo[k]++; break; |
ysr@777 | 803 | } |
ysr@777 | 804 | } |
ysr@777 | 805 | #endif |
ysr@777 | 806 | if (max == NULL || cur_occ > max_occ) { |
ysr@777 | 807 | max = cur; |
ysr@777 | 808 | max_prev = prev; |
ysr@777 | 809 | max_ind = i; |
ysr@777 | 810 | max_occ = cur_occ; |
ysr@777 | 811 | } |
ysr@777 | 812 | prev = cur->next_addr(); |
ysr@777 | 813 | cur = cur->next(); |
ysr@777 | 814 | } |
ysr@777 | 815 | } |
ysr@777 | 816 | #endif |
ysr@777 | 817 | // XXX |
ysr@777 | 818 | guarantee(max != NULL, "Since _n_fine_entries > 0"); |
ysr@777 | 819 | #if DRT_CENSUS |
ysr@777 | 820 | gclog_or_tty->print_cr("In a coarsening: histo of occs:"); |
ysr@777 | 821 | for (int k = 0; k < HistoSize; k++) { |
ysr@777 | 822 | gclog_or_tty->print_cr(" <= %4d: %5d.", histo_limits[k], histo[k]); |
ysr@777 | 823 | } |
ysr@777 | 824 | coarsenings++; |
ysr@777 | 825 | occ_sum += max_occ; |
ysr@777 | 826 | if ((coarsenings % 100) == 0) { |
ysr@777 | 827 | gclog_or_tty->print_cr("\ncoarsenings = %d; global summary:", coarsenings); |
ysr@777 | 828 | for (int k = 0; k < HistoSize; k++) { |
ysr@777 | 829 | gclog_or_tty->print_cr(" <= %4d: %5d.", histo_limits[k], global_histo[k]); |
ysr@777 | 830 | } |
ysr@777 | 831 | gclog_or_tty->print_cr("Avg occ of deleted region = %6.2f.", |
ysr@777 | 832 | (float)occ_sum/(float)coarsenings); |
ysr@777 | 833 | } |
ysr@777 | 834 | #endif |
ysr@777 | 835 | |
ysr@777 | 836 | // Set the corresponding coarse bit. |
ysr@777 | 837 | int max_hrs_index = max->hr()->hrs_index(); |
ysr@777 | 838 | if (!_coarse_map.at(max_hrs_index)) { |
ysr@777 | 839 | _coarse_map.at_put(max_hrs_index, true); |
ysr@777 | 840 | _n_coarse_entries++; |
ysr@777 | 841 | #if 0 |
ysr@777 | 842 | gclog_or_tty->print("Coarsened entry in region [" PTR_FORMAT "...] " |
ysr@777 | 843 | "for region [" PTR_FORMAT "...] (%d coarse entries).\n", |
ysr@777 | 844 | hr()->bottom(), |
ysr@777 | 845 | max->hr()->bottom(), |
ysr@777 | 846 | _n_coarse_entries); |
ysr@777 | 847 | #endif |
ysr@777 | 848 | } |
ysr@777 | 849 | |
ysr@777 | 850 | // Unsplice. |
ysr@777 | 851 | *max_prev = max->next(); |
ysr@777 | 852 | Atomic::inc(&_n_coarsenings); |
ysr@777 | 853 | _n_fine_entries--; |
ysr@777 | 854 | return max; |
ysr@777 | 855 | } |
ysr@777 | 856 | |
ysr@777 | 857 | |
ysr@777 | 858 | // At present, this must be called stop-world single-threaded. |
ysr@777 | 859 | void OtherRegionsTable::scrub(CardTableModRefBS* ctbs, |
ysr@777 | 860 | BitMap* region_bm, BitMap* card_bm) { |
ysr@777 | 861 | // First eliminated garbage regions from the coarse map. |
ysr@777 | 862 | if (G1RSScrubVerbose) |
ysr@777 | 863 | gclog_or_tty->print_cr("Scrubbing region %d:", hr()->hrs_index()); |
ysr@777 | 864 | |
ysr@777 | 865 | assert(_coarse_map.size() == region_bm->size(), "Precondition"); |
ysr@777 | 866 | if (G1RSScrubVerbose) |
ysr@777 | 867 | gclog_or_tty->print(" Coarse map: before = %d...", _n_coarse_entries); |
ysr@777 | 868 | _coarse_map.set_intersection(*region_bm); |
ysr@777 | 869 | _n_coarse_entries = _coarse_map.count_one_bits(); |
ysr@777 | 870 | if (G1RSScrubVerbose) |
ysr@777 | 871 | gclog_or_tty->print_cr(" after = %d.", _n_coarse_entries); |
ysr@777 | 872 | |
ysr@777 | 873 | // Now do the fine-grained maps. |
ysr@777 | 874 | for (size_t i = 0; i < _max_fine_entries; i++) { |
ysr@777 | 875 | PosParPRT* cur = _fine_grain_regions[i]; |
ysr@777 | 876 | PosParPRT** prev = &_fine_grain_regions[i]; |
ysr@777 | 877 | while (cur != NULL) { |
ysr@777 | 878 | PosParPRT* nxt = cur->next(); |
ysr@777 | 879 | // If the entire region is dead, eliminate. |
ysr@777 | 880 | if (G1RSScrubVerbose) |
ysr@777 | 881 | gclog_or_tty->print_cr(" For other region %d:", cur->hr()->hrs_index()); |
ysr@777 | 882 | if (!region_bm->at(cur->hr()->hrs_index())) { |
ysr@777 | 883 | *prev = nxt; |
ysr@777 | 884 | cur->set_next(NULL); |
ysr@777 | 885 | _n_fine_entries--; |
ysr@777 | 886 | if (G1RSScrubVerbose) |
ysr@777 | 887 | gclog_or_tty->print_cr(" deleted via region map."); |
ysr@777 | 888 | PosParPRT::free(cur); |
ysr@777 | 889 | } else { |
ysr@777 | 890 | // Do fine-grain elimination. |
ysr@777 | 891 | if (G1RSScrubVerbose) |
ysr@777 | 892 | gclog_or_tty->print(" occ: before = %4d.", cur->occupied()); |
ysr@777 | 893 | cur->scrub(ctbs, card_bm); |
ysr@777 | 894 | if (G1RSScrubVerbose) |
ysr@777 | 895 | gclog_or_tty->print_cr(" after = %4d.", cur->occupied()); |
ysr@777 | 896 | // Did that empty the table completely? |
ysr@777 | 897 | if (cur->occupied() == 0) { |
ysr@777 | 898 | *prev = nxt; |
ysr@777 | 899 | cur->set_next(NULL); |
ysr@777 | 900 | _n_fine_entries--; |
ysr@777 | 901 | PosParPRT::free(cur); |
ysr@777 | 902 | } else { |
ysr@777 | 903 | prev = cur->next_addr(); |
ysr@777 | 904 | } |
ysr@777 | 905 | } |
ysr@777 | 906 | cur = nxt; |
ysr@777 | 907 | } |
ysr@777 | 908 | } |
ysr@777 | 909 | // Since we may have deleted a from_card_cache entry from the RS, clear |
ysr@777 | 910 | // the FCC. |
ysr@777 | 911 | clear_fcc(); |
ysr@777 | 912 | } |
ysr@777 | 913 | |
ysr@777 | 914 | |
ysr@777 | 915 | size_t OtherRegionsTable::occupied() const { |
ysr@777 | 916 | // Cast away const in this case. |
ysr@777 | 917 | MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); |
ysr@777 | 918 | size_t sum = occ_fine(); |
ysr@777 | 919 | sum += occ_sparse(); |
ysr@777 | 920 | sum += occ_coarse(); |
ysr@777 | 921 | return sum; |
ysr@777 | 922 | } |
ysr@777 | 923 | |
ysr@777 | 924 | size_t OtherRegionsTable::occ_fine() const { |
ysr@777 | 925 | size_t sum = 0; |
ysr@777 | 926 | for (size_t i = 0; i < _max_fine_entries; i++) { |
ysr@777 | 927 | PosParPRT* cur = _fine_grain_regions[i]; |
ysr@777 | 928 | while (cur != NULL) { |
ysr@777 | 929 | sum += cur->occupied(); |
ysr@777 | 930 | cur = cur->next(); |
ysr@777 | 931 | } |
ysr@777 | 932 | } |
ysr@777 | 933 | return sum; |
ysr@777 | 934 | } |
ysr@777 | 935 | |
ysr@777 | 936 | size_t OtherRegionsTable::occ_coarse() const { |
tonyp@1377 | 937 | return (_n_coarse_entries * HeapRegion::CardsPerRegion); |
ysr@777 | 938 | } |
ysr@777 | 939 | |
ysr@777 | 940 | size_t OtherRegionsTable::occ_sparse() const { |
ysr@777 | 941 | return _sparse_table.occupied(); |
ysr@777 | 942 | } |
ysr@777 | 943 | |
ysr@777 | 944 | size_t OtherRegionsTable::mem_size() const { |
ysr@777 | 945 | // Cast away const in this case. |
ysr@777 | 946 | MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); |
ysr@777 | 947 | size_t sum = 0; |
ysr@777 | 948 | for (size_t i = 0; i < _max_fine_entries; i++) { |
ysr@777 | 949 | PosParPRT* cur = _fine_grain_regions[i]; |
ysr@777 | 950 | while (cur != NULL) { |
ysr@777 | 951 | sum += cur->mem_size(); |
ysr@777 | 952 | cur = cur->next(); |
ysr@777 | 953 | } |
ysr@777 | 954 | } |
ysr@777 | 955 | sum += (sizeof(PosParPRT*) * _max_fine_entries); |
ysr@777 | 956 | sum += (_coarse_map.size_in_words() * HeapWordSize); |
ysr@777 | 957 | sum += (_sparse_table.mem_size()); |
ysr@777 | 958 | sum += sizeof(*this) - sizeof(_sparse_table); // Avoid double counting above. |
ysr@777 | 959 | return sum; |
ysr@777 | 960 | } |
ysr@777 | 961 | |
ysr@777 | 962 | size_t OtherRegionsTable::static_mem_size() { |
ysr@777 | 963 | return _from_card_cache_mem_size; |
ysr@777 | 964 | } |
ysr@777 | 965 | |
ysr@777 | 966 | size_t OtherRegionsTable::fl_mem_size() { |
ysr@777 | 967 | return PerRegionTable::fl_mem_size() + PosParPRT::fl_mem_size(); |
ysr@777 | 968 | } |
ysr@777 | 969 | |
ysr@777 | 970 | void OtherRegionsTable::clear_fcc() { |
ysr@777 | 971 | for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { |
ysr@777 | 972 | _from_card_cache[i][hr()->hrs_index()] = -1; |
ysr@777 | 973 | } |
ysr@777 | 974 | } |
ysr@777 | 975 | |
ysr@777 | 976 | void OtherRegionsTable::clear() { |
ysr@777 | 977 | MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); |
ysr@777 | 978 | for (size_t i = 0; i < _max_fine_entries; i++) { |
ysr@777 | 979 | PosParPRT* cur = _fine_grain_regions[i]; |
ysr@777 | 980 | while (cur != NULL) { |
ysr@777 | 981 | PosParPRT* nxt = cur->next(); |
ysr@777 | 982 | PosParPRT::free(cur); |
ysr@777 | 983 | cur = nxt; |
ysr@777 | 984 | } |
ysr@777 | 985 | _fine_grain_regions[i] = NULL; |
ysr@777 | 986 | } |
ysr@777 | 987 | _sparse_table.clear(); |
ysr@777 | 988 | _coarse_map.clear(); |
ysr@777 | 989 | _n_fine_entries = 0; |
ysr@777 | 990 | _n_coarse_entries = 0; |
ysr@777 | 991 | |
ysr@777 | 992 | clear_fcc(); |
ysr@777 | 993 | } |
ysr@777 | 994 | |
ysr@777 | 995 | void OtherRegionsTable::clear_incoming_entry(HeapRegion* from_hr) { |
ysr@777 | 996 | MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); |
ysr@777 | 997 | size_t hrs_ind = (size_t)from_hr->hrs_index(); |
ysr@777 | 998 | size_t ind = hrs_ind & _mod_max_fine_entries_mask; |
ysr@777 | 999 | if (del_single_region_table(ind, from_hr)) { |
ysr@777 | 1000 | assert(!_coarse_map.at(hrs_ind), "Inv"); |
ysr@777 | 1001 | } else { |
ysr@777 | 1002 | _coarse_map.par_at_put(hrs_ind, 0); |
ysr@777 | 1003 | } |
ysr@777 | 1004 | // Check to see if any of the fcc entries come from here. |
ysr@777 | 1005 | int hr_ind = hr()->hrs_index(); |
ysr@777 | 1006 | for (int tid = 0; tid < HeapRegionRemSet::num_par_rem_sets(); tid++) { |
ysr@777 | 1007 | int fcc_ent = _from_card_cache[tid][hr_ind]; |
ysr@777 | 1008 | if (fcc_ent != -1) { |
ysr@777 | 1009 | HeapWord* card_addr = (HeapWord*) |
ysr@777 | 1010 | (uintptr_t(fcc_ent) << CardTableModRefBS::card_shift); |
ysr@777 | 1011 | if (hr()->is_in_reserved(card_addr)) { |
ysr@777 | 1012 | // Clear the from card cache. |
ysr@777 | 1013 | _from_card_cache[tid][hr_ind] = -1; |
ysr@777 | 1014 | } |
ysr@777 | 1015 | } |
ysr@777 | 1016 | } |
ysr@777 | 1017 | } |
ysr@777 | 1018 | |
ysr@777 | 1019 | bool OtherRegionsTable::del_single_region_table(size_t ind, |
ysr@777 | 1020 | HeapRegion* hr) { |
ysr@777 | 1021 | assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); |
ysr@777 | 1022 | PosParPRT** prev_addr = &_fine_grain_regions[ind]; |
ysr@777 | 1023 | PosParPRT* prt = *prev_addr; |
ysr@777 | 1024 | while (prt != NULL && prt->hr() != hr) { |
ysr@777 | 1025 | prev_addr = prt->next_addr(); |
ysr@777 | 1026 | prt = prt->next(); |
ysr@777 | 1027 | } |
ysr@777 | 1028 | if (prt != NULL) { |
ysr@777 | 1029 | assert(prt->hr() == hr, "Loop postcondition."); |
ysr@777 | 1030 | *prev_addr = prt->next(); |
ysr@777 | 1031 | PosParPRT::free(prt); |
ysr@777 | 1032 | _n_fine_entries--; |
ysr@777 | 1033 | return true; |
ysr@777 | 1034 | } else { |
ysr@777 | 1035 | return false; |
ysr@777 | 1036 | } |
ysr@777 | 1037 | } |
ysr@777 | 1038 | |
ysr@1280 | 1039 | bool OtherRegionsTable::contains_reference(OopOrNarrowOopStar from) const { |
ysr@777 | 1040 | // Cast away const in this case. |
ysr@777 | 1041 | MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); |
ysr@777 | 1042 | return contains_reference_locked(from); |
ysr@777 | 1043 | } |
ysr@777 | 1044 | |
ysr@1280 | 1045 | bool OtherRegionsTable::contains_reference_locked(OopOrNarrowOopStar from) const { |
ysr@777 | 1046 | HeapRegion* hr = _g1h->heap_region_containing_raw(from); |
ysr@777 | 1047 | if (hr == NULL) return false; |
johnc@1242 | 1048 | RegionIdx_t hr_ind = (RegionIdx_t) hr->hrs_index(); |
ysr@777 | 1049 | // Is this region in the coarse map? |
ysr@777 | 1050 | if (_coarse_map.at(hr_ind)) return true; |
ysr@777 | 1051 | |
ysr@777 | 1052 | PosParPRT* prt = find_region_table(hr_ind & _mod_max_fine_entries_mask, |
ysr@777 | 1053 | hr); |
ysr@777 | 1054 | if (prt != NULL) { |
ysr@777 | 1055 | return prt->contains_reference(from); |
ysr@777 | 1056 | |
ysr@777 | 1057 | } else { |
ysr@777 | 1058 | uintptr_t from_card = |
ysr@777 | 1059 | (uintptr_t(from) >> CardTableModRefBS::card_shift); |
ysr@777 | 1060 | uintptr_t hr_bot_card_index = |
ysr@777 | 1061 | uintptr_t(hr->bottom()) >> CardTableModRefBS::card_shift; |
ysr@777 | 1062 | assert(from_card >= hr_bot_card_index, "Inv"); |
johnc@1242 | 1063 | CardIdx_t card_index = from_card - hr_bot_card_index; |
tonyp@1377 | 1064 | assert(0 <= card_index && card_index < HeapRegion::CardsPerRegion, |
tonyp@1377 | 1065 | "Must be in range."); |
johnc@1242 | 1066 | return _sparse_table.contains_card(hr_ind, card_index); |
ysr@777 | 1067 | } |
ysr@777 | 1068 | |
ysr@777 | 1069 | |
ysr@777 | 1070 | } |
ysr@777 | 1071 | |
tonyp@2493 | 1072 | void |
tonyp@2493 | 1073 | OtherRegionsTable::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { |
tonyp@2493 | 1074 | _sparse_table.do_cleanup_work(hrrs_cleanup_task); |
tonyp@2493 | 1075 | } |
tonyp@2493 | 1076 | |
iveresov@1230 | 1077 | // Determines how many threads can add records to an rset in parallel. |
iveresov@1230 | 1078 | // This can be done by either mutator threads together with the |
iveresov@1230 | 1079 | // concurrent refinement threads or GC threads. |
ysr@777 | 1080 | int HeapRegionRemSet::num_par_rem_sets() { |
iveresov@1230 | 1081 | return (int)MAX2(DirtyCardQueueSet::num_par_ids() + ConcurrentG1Refine::thread_num(), ParallelGCThreads); |
ysr@777 | 1082 | } |
ysr@777 | 1083 | |
ysr@777 | 1084 | HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, |
ysr@777 | 1085 | HeapRegion* hr) |
tonyp@1825 | 1086 | : _bosa(bosa), _other_regions(hr), _iter_state(Unclaimed) { } |
ysr@777 | 1087 | |
ysr@777 | 1088 | |
iveresov@1696 | 1089 | void HeapRegionRemSet::setup_remset_size() { |
iveresov@1696 | 1090 | // Setup sparse and fine-grain tables sizes. |
iveresov@1696 | 1091 | // table_size = base * (log(region_size / 1M) + 1) |
iveresov@1696 | 1092 | int region_size_log_mb = MAX2((int)HeapRegion::LogOfHRGrainBytes - (int)LOG_M, 0); |
iveresov@1696 | 1093 | if (FLAG_IS_DEFAULT(G1RSetSparseRegionEntries)) { |
iveresov@1696 | 1094 | G1RSetSparseRegionEntries = G1RSetSparseRegionEntriesBase * (region_size_log_mb + 1); |
iveresov@1696 | 1095 | } |
iveresov@1696 | 1096 | if (FLAG_IS_DEFAULT(G1RSetRegionEntries)) { |
iveresov@1696 | 1097 | G1RSetRegionEntries = G1RSetRegionEntriesBase * (region_size_log_mb + 1); |
iveresov@1696 | 1098 | } |
iveresov@1696 | 1099 | guarantee(G1RSetSparseRegionEntries > 0 && G1RSetRegionEntries > 0 , "Sanity"); |
iveresov@1696 | 1100 | } |
iveresov@1696 | 1101 | |
ysr@777 | 1102 | void HeapRegionRemSet::init_for_par_iteration() { |
ysr@777 | 1103 | _iter_state = Unclaimed; |
ysr@777 | 1104 | } |
ysr@777 | 1105 | |
ysr@777 | 1106 | bool HeapRegionRemSet::claim_iter() { |
ysr@777 | 1107 | if (_iter_state != Unclaimed) return false; |
ysr@777 | 1108 | jint res = Atomic::cmpxchg(Claimed, (jint*)(&_iter_state), Unclaimed); |
ysr@777 | 1109 | return (res == Unclaimed); |
ysr@777 | 1110 | } |
ysr@777 | 1111 | |
ysr@777 | 1112 | void HeapRegionRemSet::set_iter_complete() { |
ysr@777 | 1113 | _iter_state = Complete; |
ysr@777 | 1114 | } |
ysr@777 | 1115 | |
ysr@777 | 1116 | bool HeapRegionRemSet::iter_is_complete() { |
ysr@777 | 1117 | return _iter_state == Complete; |
ysr@777 | 1118 | } |
ysr@777 | 1119 | |
ysr@777 | 1120 | |
ysr@777 | 1121 | void HeapRegionRemSet::init_iterator(HeapRegionRemSetIterator* iter) const { |
ysr@777 | 1122 | iter->initialize(this); |
ysr@777 | 1123 | } |
ysr@777 | 1124 | |
ysr@777 | 1125 | #ifndef PRODUCT |
ysr@777 | 1126 | void HeapRegionRemSet::print() const { |
ysr@777 | 1127 | HeapRegionRemSetIterator iter; |
ysr@777 | 1128 | init_iterator(&iter); |
ysr@777 | 1129 | size_t card_index; |
ysr@777 | 1130 | while (iter.has_next(card_index)) { |
ysr@777 | 1131 | HeapWord* card_start = |
ysr@777 | 1132 | G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); |
ysr@777 | 1133 | gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); |
ysr@777 | 1134 | } |
ysr@777 | 1135 | // XXX |
ysr@777 | 1136 | if (iter.n_yielded() != occupied()) { |
ysr@777 | 1137 | gclog_or_tty->print_cr("Yielded disagrees with occupied:"); |
ysr@777 | 1138 | gclog_or_tty->print_cr(" %6d yielded (%6d coarse, %6d fine).", |
ysr@777 | 1139 | iter.n_yielded(), |
ysr@777 | 1140 | iter.n_yielded_coarse(), iter.n_yielded_fine()); |
ysr@777 | 1141 | gclog_or_tty->print_cr(" %6d occ (%6d coarse, %6d fine).", |
ysr@777 | 1142 | occupied(), occ_coarse(), occ_fine()); |
ysr@777 | 1143 | } |
ysr@777 | 1144 | guarantee(iter.n_yielded() == occupied(), |
ysr@777 | 1145 | "We should have yielded all the represented cards."); |
ysr@777 | 1146 | } |
ysr@777 | 1147 | #endif |
ysr@777 | 1148 | |
ysr@777 | 1149 | void HeapRegionRemSet::cleanup() { |
ysr@777 | 1150 | SparsePRT::cleanup_all(); |
ysr@777 | 1151 | } |
ysr@777 | 1152 | |
ysr@777 | 1153 | void HeapRegionRemSet::par_cleanup() { |
ysr@777 | 1154 | PosParPRT::par_contract_all(); |
ysr@777 | 1155 | } |
ysr@777 | 1156 | |
ysr@777 | 1157 | void HeapRegionRemSet::clear() { |
ysr@777 | 1158 | _other_regions.clear(); |
ysr@777 | 1159 | assert(occupied() == 0, "Should be clear."); |
ysr@777 | 1160 | } |
ysr@777 | 1161 | |
ysr@777 | 1162 | void HeapRegionRemSet::scrub(CardTableModRefBS* ctbs, |
ysr@777 | 1163 | BitMap* region_bm, BitMap* card_bm) { |
ysr@777 | 1164 | _other_regions.scrub(ctbs, region_bm, card_bm); |
ysr@777 | 1165 | } |
ysr@777 | 1166 | |
ysr@777 | 1167 | //-------------------- Iteration -------------------- |
ysr@777 | 1168 | |
ysr@777 | 1169 | HeapRegionRemSetIterator:: |
ysr@777 | 1170 | HeapRegionRemSetIterator() : |
ysr@777 | 1171 | _hrrs(NULL), |
ysr@777 | 1172 | _g1h(G1CollectedHeap::heap()), |
ysr@777 | 1173 | _bosa(NULL), |
tonyp@2239 | 1174 | _sparse_iter() { } |
ysr@777 | 1175 | |
ysr@777 | 1176 | void HeapRegionRemSetIterator::initialize(const HeapRegionRemSet* hrrs) { |
ysr@777 | 1177 | _hrrs = hrrs; |
ysr@777 | 1178 | _coarse_map = &_hrrs->_other_regions._coarse_map; |
ysr@777 | 1179 | _fine_grain_regions = _hrrs->_other_regions._fine_grain_regions; |
ysr@777 | 1180 | _bosa = _hrrs->bosa(); |
ysr@777 | 1181 | |
ysr@777 | 1182 | _is = Sparse; |
ysr@777 | 1183 | // Set these values so that we increment to the first region. |
ysr@777 | 1184 | _coarse_cur_region_index = -1; |
tonyp@1377 | 1185 | _coarse_cur_region_cur_card = (HeapRegion::CardsPerRegion-1);; |
ysr@777 | 1186 | |
ysr@777 | 1187 | _cur_region_cur_card = 0; |
ysr@777 | 1188 | |
ysr@777 | 1189 | _fine_array_index = -1; |
ysr@777 | 1190 | _fine_cur_prt = NULL; |
ysr@777 | 1191 | |
ysr@777 | 1192 | _n_yielded_coarse = 0; |
ysr@777 | 1193 | _n_yielded_fine = 0; |
ysr@777 | 1194 | _n_yielded_sparse = 0; |
ysr@777 | 1195 | |
ysr@777 | 1196 | _sparse_iter.init(&hrrs->_other_regions._sparse_table); |
ysr@777 | 1197 | } |
ysr@777 | 1198 | |
ysr@777 | 1199 | bool HeapRegionRemSetIterator::coarse_has_next(size_t& card_index) { |
ysr@777 | 1200 | if (_hrrs->_other_regions._n_coarse_entries == 0) return false; |
ysr@777 | 1201 | // Go to the next card. |
ysr@777 | 1202 | _coarse_cur_region_cur_card++; |
ysr@777 | 1203 | // Was the last the last card in the current region? |
tonyp@1377 | 1204 | if (_coarse_cur_region_cur_card == HeapRegion::CardsPerRegion) { |
ysr@777 | 1205 | // Yes: find the next region. This may leave _coarse_cur_region_index |
ysr@777 | 1206 | // Set to the last index, in which case there are no more coarse |
ysr@777 | 1207 | // regions. |
ysr@777 | 1208 | _coarse_cur_region_index = |
ysr@777 | 1209 | (int) _coarse_map->get_next_one_offset(_coarse_cur_region_index + 1); |
ysr@777 | 1210 | if ((size_t)_coarse_cur_region_index < _coarse_map->size()) { |
ysr@777 | 1211 | _coarse_cur_region_cur_card = 0; |
ysr@777 | 1212 | HeapWord* r_bot = |
ysr@777 | 1213 | _g1h->region_at(_coarse_cur_region_index)->bottom(); |
ysr@777 | 1214 | _cur_region_card_offset = _bosa->index_for(r_bot); |
ysr@777 | 1215 | } else { |
ysr@777 | 1216 | return false; |
ysr@777 | 1217 | } |
ysr@777 | 1218 | } |
ysr@777 | 1219 | // If we didn't return false above, then we can yield a card. |
ysr@777 | 1220 | card_index = _cur_region_card_offset + _coarse_cur_region_cur_card; |
ysr@777 | 1221 | return true; |
ysr@777 | 1222 | } |
ysr@777 | 1223 | |
ysr@777 | 1224 | void HeapRegionRemSetIterator::fine_find_next_non_null_prt() { |
ysr@777 | 1225 | // Otherwise, find the next bucket list in the array. |
ysr@777 | 1226 | _fine_array_index++; |
ysr@777 | 1227 | while (_fine_array_index < (int) OtherRegionsTable::_max_fine_entries) { |
ysr@777 | 1228 | _fine_cur_prt = _fine_grain_regions[_fine_array_index]; |
ysr@777 | 1229 | if (_fine_cur_prt != NULL) return; |
ysr@777 | 1230 | else _fine_array_index++; |
ysr@777 | 1231 | } |
ysr@777 | 1232 | assert(_fine_cur_prt == NULL, "Loop post"); |
ysr@777 | 1233 | } |
ysr@777 | 1234 | |
ysr@777 | 1235 | bool HeapRegionRemSetIterator::fine_has_next(size_t& card_index) { |
ysr@777 | 1236 | if (fine_has_next()) { |
ysr@777 | 1237 | _cur_region_cur_card = |
ysr@777 | 1238 | _fine_cur_prt->_bm.get_next_one_offset(_cur_region_cur_card + 1); |
ysr@777 | 1239 | } |
ysr@777 | 1240 | while (!fine_has_next()) { |
tonyp@1377 | 1241 | if (_cur_region_cur_card == (size_t) HeapRegion::CardsPerRegion) { |
ysr@777 | 1242 | _cur_region_cur_card = 0; |
ysr@777 | 1243 | _fine_cur_prt = _fine_cur_prt->next(); |
ysr@777 | 1244 | } |
ysr@777 | 1245 | if (_fine_cur_prt == NULL) { |
ysr@777 | 1246 | fine_find_next_non_null_prt(); |
ysr@777 | 1247 | if (_fine_cur_prt == NULL) return false; |
ysr@777 | 1248 | } |
ysr@777 | 1249 | assert(_fine_cur_prt != NULL && _cur_region_cur_card == 0, |
ysr@777 | 1250 | "inv."); |
ysr@777 | 1251 | HeapWord* r_bot = |
ysr@777 | 1252 | _fine_cur_prt->hr()->bottom(); |
ysr@777 | 1253 | _cur_region_card_offset = _bosa->index_for(r_bot); |
ysr@777 | 1254 | _cur_region_cur_card = _fine_cur_prt->_bm.get_next_one_offset(0); |
ysr@777 | 1255 | } |
ysr@777 | 1256 | assert(fine_has_next(), "Or else we exited the loop via the return."); |
ysr@777 | 1257 | card_index = _cur_region_card_offset + _cur_region_cur_card; |
ysr@777 | 1258 | return true; |
ysr@777 | 1259 | } |
ysr@777 | 1260 | |
ysr@777 | 1261 | bool HeapRegionRemSetIterator::fine_has_next() { |
ysr@777 | 1262 | return |
ysr@777 | 1263 | _fine_cur_prt != NULL && |
tonyp@1377 | 1264 | _cur_region_cur_card < (size_t) HeapRegion::CardsPerRegion; |
ysr@777 | 1265 | } |
ysr@777 | 1266 | |
ysr@777 | 1267 | bool HeapRegionRemSetIterator::has_next(size_t& card_index) { |
ysr@777 | 1268 | switch (_is) { |
ysr@777 | 1269 | case Sparse: |
ysr@777 | 1270 | if (_sparse_iter.has_next(card_index)) { |
ysr@777 | 1271 | _n_yielded_sparse++; |
ysr@777 | 1272 | return true; |
ysr@777 | 1273 | } |
ysr@777 | 1274 | // Otherwise, deliberate fall-through |
ysr@777 | 1275 | _is = Fine; |
ysr@777 | 1276 | case Fine: |
ysr@777 | 1277 | if (fine_has_next(card_index)) { |
ysr@777 | 1278 | _n_yielded_fine++; |
ysr@777 | 1279 | return true; |
ysr@777 | 1280 | } |
ysr@777 | 1281 | // Otherwise, deliberate fall-through |
ysr@777 | 1282 | _is = Coarse; |
ysr@777 | 1283 | case Coarse: |
ysr@777 | 1284 | if (coarse_has_next(card_index)) { |
ysr@777 | 1285 | _n_yielded_coarse++; |
ysr@777 | 1286 | return true; |
ysr@777 | 1287 | } |
ysr@777 | 1288 | // Otherwise... |
ysr@777 | 1289 | break; |
ysr@777 | 1290 | } |
ysr@777 | 1291 | assert(ParallelGCThreads > 1 || |
ysr@777 | 1292 | n_yielded() == _hrrs->occupied(), |
ysr@777 | 1293 | "Should have yielded all the cards in the rem set " |
ysr@777 | 1294 | "(in the non-par case)."); |
ysr@777 | 1295 | return false; |
ysr@777 | 1296 | } |
ysr@777 | 1297 | |
ysr@777 | 1298 | |
ysr@777 | 1299 | |
ysr@1280 | 1300 | OopOrNarrowOopStar* HeapRegionRemSet::_recorded_oops = NULL; |
ysr@1280 | 1301 | HeapWord** HeapRegionRemSet::_recorded_cards = NULL; |
ysr@1280 | 1302 | HeapRegion** HeapRegionRemSet::_recorded_regions = NULL; |
ysr@1280 | 1303 | int HeapRegionRemSet::_n_recorded = 0; |
ysr@777 | 1304 | |
ysr@777 | 1305 | HeapRegionRemSet::Event* HeapRegionRemSet::_recorded_events = NULL; |
ysr@777 | 1306 | int* HeapRegionRemSet::_recorded_event_index = NULL; |
ysr@777 | 1307 | int HeapRegionRemSet::_n_recorded_events = 0; |
ysr@777 | 1308 | |
ysr@1280 | 1309 | void HeapRegionRemSet::record(HeapRegion* hr, OopOrNarrowOopStar f) { |
ysr@777 | 1310 | if (_recorded_oops == NULL) { |
ysr@777 | 1311 | assert(_n_recorded == 0 |
ysr@777 | 1312 | && _recorded_cards == NULL |
ysr@777 | 1313 | && _recorded_regions == NULL, |
ysr@777 | 1314 | "Inv"); |
ysr@1280 | 1315 | _recorded_oops = NEW_C_HEAP_ARRAY(OopOrNarrowOopStar, MaxRecorded); |
ysr@1280 | 1316 | _recorded_cards = NEW_C_HEAP_ARRAY(HeapWord*, MaxRecorded); |
ysr@1280 | 1317 | _recorded_regions = NEW_C_HEAP_ARRAY(HeapRegion*, MaxRecorded); |
ysr@777 | 1318 | } |
ysr@777 | 1319 | if (_n_recorded == MaxRecorded) { |
ysr@777 | 1320 | gclog_or_tty->print_cr("Filled up 'recorded' (%d).", MaxRecorded); |
ysr@777 | 1321 | } else { |
ysr@777 | 1322 | _recorded_cards[_n_recorded] = |
ysr@777 | 1323 | (HeapWord*)align_size_down(uintptr_t(f), |
ysr@777 | 1324 | CardTableModRefBS::card_size); |
ysr@777 | 1325 | _recorded_oops[_n_recorded] = f; |
ysr@777 | 1326 | _recorded_regions[_n_recorded] = hr; |
ysr@777 | 1327 | _n_recorded++; |
ysr@777 | 1328 | } |
ysr@777 | 1329 | } |
ysr@777 | 1330 | |
ysr@777 | 1331 | void HeapRegionRemSet::record_event(Event evnt) { |
ysr@777 | 1332 | if (!G1RecordHRRSEvents) return; |
ysr@777 | 1333 | |
ysr@777 | 1334 | if (_recorded_events == NULL) { |
ysr@777 | 1335 | assert(_n_recorded_events == 0 |
ysr@777 | 1336 | && _recorded_event_index == NULL, |
ysr@777 | 1337 | "Inv"); |
ysr@777 | 1338 | _recorded_events = NEW_C_HEAP_ARRAY(Event, MaxRecordedEvents); |
ysr@777 | 1339 | _recorded_event_index = NEW_C_HEAP_ARRAY(int, MaxRecordedEvents); |
ysr@777 | 1340 | } |
ysr@777 | 1341 | if (_n_recorded_events == MaxRecordedEvents) { |
ysr@777 | 1342 | gclog_or_tty->print_cr("Filled up 'recorded_events' (%d).", MaxRecordedEvents); |
ysr@777 | 1343 | } else { |
ysr@777 | 1344 | _recorded_events[_n_recorded_events] = evnt; |
ysr@777 | 1345 | _recorded_event_index[_n_recorded_events] = _n_recorded; |
ysr@777 | 1346 | _n_recorded_events++; |
ysr@777 | 1347 | } |
ysr@777 | 1348 | } |
ysr@777 | 1349 | |
ysr@777 | 1350 | void HeapRegionRemSet::print_event(outputStream* str, Event evnt) { |
ysr@777 | 1351 | switch (evnt) { |
ysr@777 | 1352 | case Event_EvacStart: |
ysr@777 | 1353 | str->print("Evac Start"); |
ysr@777 | 1354 | break; |
ysr@777 | 1355 | case Event_EvacEnd: |
ysr@777 | 1356 | str->print("Evac End"); |
ysr@777 | 1357 | break; |
ysr@777 | 1358 | case Event_RSUpdateEnd: |
ysr@777 | 1359 | str->print("RS Update End"); |
ysr@777 | 1360 | break; |
ysr@777 | 1361 | } |
ysr@777 | 1362 | } |
ysr@777 | 1363 | |
ysr@777 | 1364 | void HeapRegionRemSet::print_recorded() { |
ysr@777 | 1365 | int cur_evnt = 0; |
ysr@777 | 1366 | Event cur_evnt_kind; |
ysr@777 | 1367 | int cur_evnt_ind = 0; |
ysr@777 | 1368 | if (_n_recorded_events > 0) { |
ysr@777 | 1369 | cur_evnt_kind = _recorded_events[cur_evnt]; |
ysr@777 | 1370 | cur_evnt_ind = _recorded_event_index[cur_evnt]; |
ysr@777 | 1371 | } |
ysr@777 | 1372 | |
ysr@777 | 1373 | for (int i = 0; i < _n_recorded; i++) { |
ysr@777 | 1374 | while (cur_evnt < _n_recorded_events && i == cur_evnt_ind) { |
ysr@777 | 1375 | gclog_or_tty->print("Event: "); |
ysr@777 | 1376 | print_event(gclog_or_tty, cur_evnt_kind); |
ysr@777 | 1377 | gclog_or_tty->print_cr(""); |
ysr@777 | 1378 | cur_evnt++; |
ysr@777 | 1379 | if (cur_evnt < MaxRecordedEvents) { |
ysr@777 | 1380 | cur_evnt_kind = _recorded_events[cur_evnt]; |
ysr@777 | 1381 | cur_evnt_ind = _recorded_event_index[cur_evnt]; |
ysr@777 | 1382 | } |
ysr@777 | 1383 | } |
ysr@777 | 1384 | gclog_or_tty->print("Added card " PTR_FORMAT " to region [" PTR_FORMAT "...]" |
ysr@777 | 1385 | " for ref " PTR_FORMAT ".\n", |
ysr@777 | 1386 | _recorded_cards[i], _recorded_regions[i]->bottom(), |
ysr@777 | 1387 | _recorded_oops[i]); |
ysr@777 | 1388 | } |
ysr@777 | 1389 | } |
ysr@777 | 1390 | |
tonyp@2493 | 1391 | void HeapRegionRemSet::reset_for_cleanup_tasks() { |
tonyp@2493 | 1392 | SparsePRT::reset_for_cleanup_tasks(); |
tonyp@2493 | 1393 | } |
tonyp@2493 | 1394 | |
tonyp@2493 | 1395 | void HeapRegionRemSet::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { |
tonyp@2493 | 1396 | _other_regions.do_cleanup_work(hrrs_cleanup_task); |
tonyp@2493 | 1397 | } |
tonyp@2493 | 1398 | |
tonyp@2493 | 1399 | void |
tonyp@2493 | 1400 | HeapRegionRemSet::finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task) { |
tonyp@2493 | 1401 | SparsePRT::finish_cleanup_task(hrrs_cleanup_task); |
tonyp@2493 | 1402 | } |
tonyp@2493 | 1403 | |
ysr@777 | 1404 | #ifndef PRODUCT |
ysr@777 | 1405 | void HeapRegionRemSet::test() { |
ysr@777 | 1406 | os::sleep(Thread::current(), (jlong)5000, false); |
ysr@777 | 1407 | G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
ysr@777 | 1408 | |
iveresov@1696 | 1409 | // Run with "-XX:G1LogRSetRegionEntries=2", so that 1 and 5 end up in same |
ysr@777 | 1410 | // hash bucket. |
ysr@777 | 1411 | HeapRegion* hr0 = g1h->region_at(0); |
ysr@777 | 1412 | HeapRegion* hr1 = g1h->region_at(1); |
ysr@777 | 1413 | HeapRegion* hr2 = g1h->region_at(5); |
ysr@777 | 1414 | HeapRegion* hr3 = g1h->region_at(6); |
ysr@777 | 1415 | HeapRegion* hr4 = g1h->region_at(7); |
ysr@777 | 1416 | HeapRegion* hr5 = g1h->region_at(8); |
ysr@777 | 1417 | |
ysr@777 | 1418 | HeapWord* hr1_start = hr1->bottom(); |
ysr@777 | 1419 | HeapWord* hr1_mid = hr1_start + HeapRegion::GrainWords/2; |
ysr@777 | 1420 | HeapWord* hr1_last = hr1->end() - 1; |
ysr@777 | 1421 | |
ysr@777 | 1422 | HeapWord* hr2_start = hr2->bottom(); |
ysr@777 | 1423 | HeapWord* hr2_mid = hr2_start + HeapRegion::GrainWords/2; |
ysr@777 | 1424 | HeapWord* hr2_last = hr2->end() - 1; |
ysr@777 | 1425 | |
ysr@777 | 1426 | HeapWord* hr3_start = hr3->bottom(); |
ysr@777 | 1427 | HeapWord* hr3_mid = hr3_start + HeapRegion::GrainWords/2; |
ysr@777 | 1428 | HeapWord* hr3_last = hr3->end() - 1; |
ysr@777 | 1429 | |
ysr@777 | 1430 | HeapRegionRemSet* hrrs = hr0->rem_set(); |
ysr@777 | 1431 | |
ysr@777 | 1432 | // Make three references from region 0x101... |
ysr@1280 | 1433 | hrrs->add_reference((OopOrNarrowOopStar)hr1_start); |
ysr@1280 | 1434 | hrrs->add_reference((OopOrNarrowOopStar)hr1_mid); |
ysr@1280 | 1435 | hrrs->add_reference((OopOrNarrowOopStar)hr1_last); |
ysr@777 | 1436 | |
ysr@1280 | 1437 | hrrs->add_reference((OopOrNarrowOopStar)hr2_start); |
ysr@1280 | 1438 | hrrs->add_reference((OopOrNarrowOopStar)hr2_mid); |
ysr@1280 | 1439 | hrrs->add_reference((OopOrNarrowOopStar)hr2_last); |
ysr@777 | 1440 | |
ysr@1280 | 1441 | hrrs->add_reference((OopOrNarrowOopStar)hr3_start); |
ysr@1280 | 1442 | hrrs->add_reference((OopOrNarrowOopStar)hr3_mid); |
ysr@1280 | 1443 | hrrs->add_reference((OopOrNarrowOopStar)hr3_last); |
ysr@777 | 1444 | |
ysr@777 | 1445 | // Now cause a coarsening. |
ysr@1280 | 1446 | hrrs->add_reference((OopOrNarrowOopStar)hr4->bottom()); |
ysr@1280 | 1447 | hrrs->add_reference((OopOrNarrowOopStar)hr5->bottom()); |
ysr@777 | 1448 | |
ysr@777 | 1449 | // Now, does iteration yield these three? |
ysr@777 | 1450 | HeapRegionRemSetIterator iter; |
ysr@777 | 1451 | hrrs->init_iterator(&iter); |
ysr@777 | 1452 | size_t sum = 0; |
ysr@777 | 1453 | size_t card_index; |
ysr@777 | 1454 | while (iter.has_next(card_index)) { |
ysr@777 | 1455 | HeapWord* card_start = |
ysr@777 | 1456 | G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); |
ysr@777 | 1457 | gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); |
ysr@777 | 1458 | sum++; |
ysr@777 | 1459 | } |
ysr@777 | 1460 | guarantee(sum == 11 - 3 + 2048, "Failure"); |
ysr@777 | 1461 | guarantee(sum == hrrs->occupied(), "Failure"); |
ysr@777 | 1462 | } |
ysr@777 | 1463 | #endif |