1 /* 2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "gc_implementation/g1/concurrentG1Refine.hpp" 27 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" 28 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 29 #include "gc_implementation/g1/heapRegionRemSet.hpp" 30 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" 31 #include "memory/allocation.hpp" 32 #include "memory/padded.inline.hpp" 33 #include "memory/space.inline.hpp" 34 #include "oops/oop.inline.hpp" 35 #include "utilities/bitMap.inline.hpp" 36 #include "utilities/globalDefinitions.hpp" 37 #include "utilities/growableArray.hpp" 38 39 class PerRegionTable: public CHeapObj<mtGC> { 40 friend class OtherRegionsTable; 41 friend class HeapRegionRemSetIterator; 42 43 HeapRegion* _hr; 44 BitMap _bm; 45 jint _occupied; 46 47 // next pointer for free/allocated 'all' list 48 PerRegionTable* _next; 49 50 // prev pointer for the allocated 'all' list 51 PerRegionTable* _prev; 52 53 // next pointer in collision list 54 PerRegionTable * _collision_list_next; 55 56 // Global free list of PRTs 57 static PerRegionTable* _free_list; 58 59 protected: 60 // We need access in order to union things into the base table. 61 BitMap* bm() { return &_bm; } 62 63 void recount_occupied() { 64 _occupied = (jint) bm()->count_one_bits(); 65 } 66 67 PerRegionTable(HeapRegion* hr) : 68 _hr(hr), 69 _occupied(0), 70 _bm(HeapRegion::CardsPerRegion, false /* in-resource-area */), 71 _collision_list_next(NULL), _next(NULL), _prev(NULL) 72 {} 73 74 void add_card_work(CardIdx_t from_card, bool par) { 75 if (!_bm.at(from_card)) { 76 if (par) { 77 if (_bm.par_at_put(from_card, 1)) { 78 Atomic::inc(&_occupied); 79 } 80 } else { 81 _bm.at_put(from_card, 1); 82 _occupied++; 83 } 84 } 85 } 86 87 void add_reference_work(OopOrNarrowOopStar from, bool par) { 88 // Must make this robust in case "from" is not in "_hr", because of 89 // concurrency. 90 91 if (G1TraceHeapRegionRememberedSet) { 92 gclog_or_tty->print_cr(" PRT::Add_reference_work(" PTR_FORMAT "->" PTR_FORMAT").", 93 from, 94 UseCompressedOops 95 ? (void *)oopDesc::load_decode_heap_oop((narrowOop*)from) 96 : (void *)oopDesc::load_decode_heap_oop((oop*)from)); 97 } 98 99 HeapRegion* loc_hr = hr(); 100 // If the test below fails, then this table was reused concurrently 101 // with this operation. This is OK, since the old table was coarsened, 102 // and adding a bit to the new table is never incorrect. 103 // If the table used to belong to a continues humongous region and is 104 // now reused for the corresponding start humongous region, we need to 105 // make sure that we detect this. Thus, we call is_in_reserved_raw() 106 // instead of just is_in_reserved() here. 107 if (loc_hr->is_in_reserved_raw(from)) { 108 size_t hw_offset = pointer_delta((HeapWord*)from, loc_hr->bottom()); 109 CardIdx_t from_card = (CardIdx_t) 110 hw_offset >> (CardTableModRefBS::card_shift - LogHeapWordSize); 111 112 assert(0 <= from_card && (size_t)from_card < HeapRegion::CardsPerRegion, 113 "Must be in range."); 114 add_card_work(from_card, par); 115 } 116 } 117 118 public: 119 120 HeapRegion* hr() const { return _hr; } 121 122 jint occupied() const { 123 // Overkill, but if we ever need it... 124 // guarantee(_occupied == _bm.count_one_bits(), "Check"); 125 return _occupied; 126 } 127 128 void init(HeapRegion* hr, bool clear_links_to_all_list) { 129 if (clear_links_to_all_list) { 130 set_next(NULL); 131 set_prev(NULL); 132 } 133 _hr = hr; 134 _collision_list_next = NULL; 135 _occupied = 0; 136 _bm.clear(); 137 } 138 139 void add_reference(OopOrNarrowOopStar from) { 140 add_reference_work(from, /*parallel*/ true); 141 } 142 143 void seq_add_reference(OopOrNarrowOopStar from) { 144 add_reference_work(from, /*parallel*/ false); 145 } 146 147 void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { 148 HeapWord* hr_bot = hr()->bottom(); 149 size_t hr_first_card_index = ctbs->index_for(hr_bot); 150 bm()->set_intersection_at_offset(*card_bm, hr_first_card_index); 151 recount_occupied(); 152 } 153 154 void add_card(CardIdx_t from_card_index) { 155 add_card_work(from_card_index, /*parallel*/ true); 156 } 157 158 void seq_add_card(CardIdx_t from_card_index) { 159 add_card_work(from_card_index, /*parallel*/ false); 160 } 161 162 // (Destructively) union the bitmap of the current table into the given 163 // bitmap (which is assumed to be of the same size.) 164 void union_bitmap_into(BitMap* bm) { 165 bm->set_union(_bm); 166 } 167 168 // Mem size in bytes. 169 size_t mem_size() const { 170 return sizeof(this) + _bm.size_in_words() * HeapWordSize; 171 } 172 173 // Requires "from" to be in "hr()". 174 bool contains_reference(OopOrNarrowOopStar from) const { 175 assert(hr()->is_in_reserved(from), "Precondition."); 176 size_t card_ind = pointer_delta(from, hr()->bottom(), 177 CardTableModRefBS::card_size); 178 return _bm.at(card_ind); 179 } 180 181 // Bulk-free the PRTs from prt to last, assumes that they are 182 // linked together using their _next field. 183 static void bulk_free(PerRegionTable* prt, PerRegionTable* last) { 184 while (true) { 185 PerRegionTable* fl = _free_list; 186 last->set_next(fl); 187 PerRegionTable* res = (PerRegionTable*) Atomic::cmpxchg_ptr(prt, &_free_list, fl); 188 if (res == fl) { 189 return; 190 } 191 } 192 ShouldNotReachHere(); 193 } 194 195 static void free(PerRegionTable* prt) { 196 bulk_free(prt, prt); 197 } 198 199 // Returns an initialized PerRegionTable instance. 200 static PerRegionTable* alloc(HeapRegion* hr) { 201 PerRegionTable* fl = _free_list; 202 while (fl != NULL) { 203 PerRegionTable* nxt = fl->next(); 204 PerRegionTable* res = 205 (PerRegionTable*) 206 Atomic::cmpxchg_ptr(nxt, &_free_list, fl); 207 if (res == fl) { 208 fl->init(hr, true); 209 return fl; 210 } else { 211 fl = _free_list; 212 } 213 } 214 assert(fl == NULL, "Loop condition."); 215 return new PerRegionTable(hr); 216 } 217 218 PerRegionTable* next() const { return _next; } 219 void set_next(PerRegionTable* next) { _next = next; } 220 PerRegionTable* prev() const { return _prev; } 221 void set_prev(PerRegionTable* prev) { _prev = prev; } 222 223 // Accessor and Modification routines for the pointer for the 224 // singly linked collision list that links the PRTs within the 225 // OtherRegionsTable::_fine_grain_regions hash table. 226 // 227 // It might be useful to also make the collision list doubly linked 228 // to avoid iteration over the collisions list during scrubbing/deletion. 229 // OTOH there might not be many collisions. 230 231 PerRegionTable* collision_list_next() const { 232 return _collision_list_next; 233 } 234 235 void set_collision_list_next(PerRegionTable* next) { 236 _collision_list_next = next; 237 } 238 239 PerRegionTable** collision_list_next_addr() { 240 return &_collision_list_next; 241 } 242 243 static size_t fl_mem_size() { 244 PerRegionTable* cur = _free_list; 245 size_t res = 0; 246 while (cur != NULL) { 247 res += cur->mem_size(); 248 cur = cur->next(); 249 } 250 return res; 251 } 252 253 static void test_fl_mem_size(); 254 }; 255 256 PerRegionTable* PerRegionTable::_free_list = NULL; 257 258 size_t OtherRegionsTable::_max_fine_entries = 0; 259 size_t OtherRegionsTable::_mod_max_fine_entries_mask = 0; 260 size_t OtherRegionsTable::_fine_eviction_stride = 0; 261 size_t OtherRegionsTable::_fine_eviction_sample_size = 0; 262 263 OtherRegionsTable::OtherRegionsTable(HeapRegion* hr, Mutex* m) : 264 _g1h(G1CollectedHeap::heap()), 265 _hr(hr), _m(m), 266 _coarse_map(G1CollectedHeap::heap()->max_regions(), 267 false /* in-resource-area */), 268 _fine_grain_regions(NULL), 269 _first_all_fine_prts(NULL), _last_all_fine_prts(NULL), 270 _n_fine_entries(0), _n_coarse_entries(0), 271 _fine_eviction_start(0), 272 _sparse_table(hr) 273 { 274 typedef PerRegionTable* PerRegionTablePtr; 275 276 if (_max_fine_entries == 0) { 277 assert(_mod_max_fine_entries_mask == 0, "Both or none."); 278 size_t max_entries_log = (size_t)log2_long((jlong)G1RSetRegionEntries); 279 _max_fine_entries = (size_t)1 << max_entries_log; 280 _mod_max_fine_entries_mask = _max_fine_entries - 1; 281 282 assert(_fine_eviction_sample_size == 0 283 && _fine_eviction_stride == 0, "All init at same time."); 284 _fine_eviction_sample_size = MAX2((size_t)4, max_entries_log); 285 _fine_eviction_stride = _max_fine_entries / _fine_eviction_sample_size; 286 } 287 288 _fine_grain_regions = NEW_C_HEAP_ARRAY3(PerRegionTablePtr, _max_fine_entries, 289 mtGC, 0, AllocFailStrategy::RETURN_NULL); 290 291 if (_fine_grain_regions == NULL) { 292 vm_exit_out_of_memory(sizeof(void*)*_max_fine_entries, OOM_MALLOC_ERROR, 293 "Failed to allocate _fine_grain_entries."); 294 } 295 296 for (size_t i = 0; i < _max_fine_entries; i++) { 297 _fine_grain_regions[i] = NULL; 298 } 299 } 300 301 void OtherRegionsTable::link_to_all(PerRegionTable* prt) { 302 // We always append to the beginning of the list for convenience; 303 // the order of entries in this list does not matter. 304 if (_first_all_fine_prts != NULL) { 305 assert(_first_all_fine_prts->prev() == NULL, "invariant"); 306 _first_all_fine_prts->set_prev(prt); 307 prt->set_next(_first_all_fine_prts); 308 } else { 309 // this is the first element we insert. Adjust the "last" pointer 310 _last_all_fine_prts = prt; 311 assert(prt->next() == NULL, "just checking"); 312 } 313 // the new element is always the first element without a predecessor 314 prt->set_prev(NULL); 315 _first_all_fine_prts = prt; 316 317 assert(prt->prev() == NULL, "just checking"); 318 assert(_first_all_fine_prts == prt, "just checking"); 319 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || 320 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), 321 "just checking"); 322 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, 323 "just checking"); 324 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, 325 "just checking"); 326 } 327 328 void OtherRegionsTable::unlink_from_all(PerRegionTable* prt) { 329 if (prt->prev() != NULL) { 330 assert(_first_all_fine_prts != prt, "just checking"); 331 prt->prev()->set_next(prt->next()); 332 // removing the last element in the list? 333 if (_last_all_fine_prts == prt) { 334 _last_all_fine_prts = prt->prev(); 335 } 336 } else { 337 assert(_first_all_fine_prts == prt, "just checking"); 338 _first_all_fine_prts = prt->next(); 339 // list is empty now? 340 if (_first_all_fine_prts == NULL) { 341 _last_all_fine_prts = NULL; 342 } 343 } 344 345 if (prt->next() != NULL) { 346 prt->next()->set_prev(prt->prev()); 347 } 348 349 prt->set_next(NULL); 350 prt->set_prev(NULL); 351 352 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || 353 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), 354 "just checking"); 355 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, 356 "just checking"); 357 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, 358 "just checking"); 359 } 360 361 int** FromCardCache::_cache = NULL; 362 uint FromCardCache::_max_regions = 0; 363 size_t FromCardCache::_static_mem_size = 0; 364 365 void FromCardCache::initialize(uint n_par_rs, uint max_num_regions) { 366 guarantee(_cache == NULL, "Should not call this multiple times"); 367 368 _max_regions = max_num_regions; 369 _cache = Padded2DArray<int, mtGC>::create_unfreeable(n_par_rs, 370 _max_regions, 371 &_static_mem_size); 372 373 for (uint i = 0; i < n_par_rs; i++) { 374 for (uint j = 0; j < _max_regions; j++) { 375 set(i, j, InvalidCard); 376 } 377 } 378 } 379 380 void FromCardCache::shrink(uint new_num_regions) { 381 for (uint i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { 382 assert(new_num_regions <= _max_regions, "Must be within max."); 383 for (uint j = new_num_regions; j < _max_regions; j++) { 384 set(i, j, InvalidCard); 385 } 386 } 387 } 388 389 #ifndef PRODUCT 390 void FromCardCache::print(outputStream* out) { 391 for (uint i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { 392 for (uint j = 0; j < _max_regions; j++) { 393 out->print_cr("_from_card_cache[%u][%u] = %d.", 394 i, j, at(i, j)); 395 } 396 } 397 } 398 #endif 399 400 void FromCardCache::clear(uint region_idx) { 401 uint num_par_remsets = HeapRegionRemSet::num_par_rem_sets(); 402 for (uint i = 0; i < num_par_remsets; i++) { 403 set(i, region_idx, InvalidCard); 404 } 405 } 406 407 void OtherRegionsTable::init_from_card_cache(uint max_regions) { 408 FromCardCache::initialize(HeapRegionRemSet::num_par_rem_sets(), max_regions); 409 } 410 411 void OtherRegionsTable::shrink_from_card_cache(uint new_num_regions) { 412 FromCardCache::shrink(new_num_regions); 413 } 414 415 void OtherRegionsTable::print_from_card_cache() { 416 FromCardCache::print(); 417 } 418 419 void OtherRegionsTable::add_reference(OopOrNarrowOopStar from, int tid) { 420 uint cur_hrs_ind = hr()->hrs_index(); 421 422 if (G1TraceHeapRegionRememberedSet) { 423 gclog_or_tty->print_cr("ORT::add_reference_work(" PTR_FORMAT "->" PTR_FORMAT ").", 424 from, 425 UseCompressedOops 426 ? (void *)oopDesc::load_decode_heap_oop((narrowOop*)from) 427 : (void *)oopDesc::load_decode_heap_oop((oop*)from)); 428 } 429 430 int from_card = (int)(uintptr_t(from) >> CardTableModRefBS::card_shift); 431 432 if (G1TraceHeapRegionRememberedSet) { 433 gclog_or_tty->print_cr("Table for [" PTR_FORMAT "...): card %d (cache = %d)", 434 hr()->bottom(), from_card, 435 FromCardCache::at((uint)tid, cur_hrs_ind)); 436 } 437 438 if (FromCardCache::contains_or_replace((uint)tid, cur_hrs_ind, from_card)) { 439 if (G1TraceHeapRegionRememberedSet) { 440 gclog_or_tty->print_cr(" from-card cache hit."); 441 } 442 assert(contains_reference(from), "We just added it!"); 443 return; 444 } 445 446 // Note that this may be a continued H region. 447 HeapRegion* from_hr = _g1h->heap_region_containing_raw(from); 448 RegionIdx_t from_hrs_ind = (RegionIdx_t) from_hr->hrs_index(); 449 450 // If the region is already coarsened, return. 451 if (_coarse_map.at(from_hrs_ind)) { 452 if (G1TraceHeapRegionRememberedSet) { 453 gclog_or_tty->print_cr(" coarse map hit."); 454 } 455 assert(contains_reference(from), "We just added it!"); 456 return; 457 } 458 459 // Otherwise find a per-region table to add it to. 460 size_t ind = from_hrs_ind & _mod_max_fine_entries_mask; 461 PerRegionTable* prt = find_region_table(ind, from_hr); 462 if (prt == NULL) { 463 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); 464 // Confirm that it's really not there... 465 prt = find_region_table(ind, from_hr); 466 if (prt == NULL) { 467 468 uintptr_t from_hr_bot_card_index = 469 uintptr_t(from_hr->bottom()) 470 >> CardTableModRefBS::card_shift; 471 CardIdx_t card_index = from_card - from_hr_bot_card_index; 472 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, 473 "Must be in range."); 474 if (G1HRRSUseSparseTable && 475 _sparse_table.add_card(from_hrs_ind, card_index)) { 476 if (G1RecordHRRSOops) { 477 HeapRegionRemSet::record(hr(), from); 478 if (G1TraceHeapRegionRememberedSet) { 479 gclog_or_tty->print(" Added card " PTR_FORMAT " to region " 480 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", 481 align_size_down(uintptr_t(from), 482 CardTableModRefBS::card_size), 483 hr()->bottom(), from); 484 } 485 } 486 if (G1TraceHeapRegionRememberedSet) { 487 gclog_or_tty->print_cr(" added card to sparse table."); 488 } 489 assert(contains_reference_locked(from), "We just added it!"); 490 return; 491 } else { 492 if (G1TraceHeapRegionRememberedSet) { 493 gclog_or_tty->print_cr(" [tid %d] sparse table entry " 494 "overflow(f: %d, t: %d)", 495 tid, from_hrs_ind, cur_hrs_ind); 496 } 497 } 498 499 if (_n_fine_entries == _max_fine_entries) { 500 prt = delete_region_table(); 501 // There is no need to clear the links to the 'all' list here: 502 // prt will be reused immediately, i.e. remain in the 'all' list. 503 prt->init(from_hr, false /* clear_links_to_all_list */); 504 } else { 505 prt = PerRegionTable::alloc(from_hr); 506 link_to_all(prt); 507 } 508 509 PerRegionTable* first_prt = _fine_grain_regions[ind]; 510 prt->set_collision_list_next(first_prt); 511 _fine_grain_regions[ind] = prt; 512 _n_fine_entries++; 513 514 if (G1HRRSUseSparseTable) { 515 // Transfer from sparse to fine-grain. 516 SparsePRTEntry *sprt_entry = _sparse_table.get_entry(from_hrs_ind); 517 assert(sprt_entry != NULL, "There should have been an entry"); 518 for (int i = 0; i < SparsePRTEntry::cards_num(); i++) { 519 CardIdx_t c = sprt_entry->card(i); 520 if (c != SparsePRTEntry::NullEntry) { 521 prt->add_card(c); 522 } 523 } 524 // Now we can delete the sparse entry. 525 bool res = _sparse_table.delete_entry(from_hrs_ind); 526 assert(res, "It should have been there."); 527 } 528 } 529 assert(prt != NULL && prt->hr() == from_hr, "consequence"); 530 } 531 // Note that we can't assert "prt->hr() == from_hr", because of the 532 // possibility of concurrent reuse. But see head comment of 533 // OtherRegionsTable for why this is OK. 534 assert(prt != NULL, "Inv"); 535 536 prt->add_reference(from); 537 538 if (G1RecordHRRSOops) { 539 HeapRegionRemSet::record(hr(), from); 540 if (G1TraceHeapRegionRememberedSet) { 541 gclog_or_tty->print("Added card " PTR_FORMAT " to region " 542 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", 543 align_size_down(uintptr_t(from), 544 CardTableModRefBS::card_size), 545 hr()->bottom(), from); 546 } 547 } 548 assert(contains_reference(from), "We just added it!"); 549 } 550 551 PerRegionTable* 552 OtherRegionsTable::find_region_table(size_t ind, HeapRegion* hr) const { 553 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); 554 PerRegionTable* prt = _fine_grain_regions[ind]; 555 while (prt != NULL && prt->hr() != hr) { 556 prt = prt->collision_list_next(); 557 } 558 // Loop postcondition is the method postcondition. 559 return prt; 560 } 561 562 jint OtherRegionsTable::_n_coarsenings = 0; 563 564 PerRegionTable* OtherRegionsTable::delete_region_table() { 565 assert(_m->owned_by_self(), "Precondition"); 566 assert(_n_fine_entries == _max_fine_entries, "Precondition"); 567 PerRegionTable* max = NULL; 568 jint max_occ = 0; 569 PerRegionTable** max_prev; 570 size_t max_ind; 571 572 size_t i = _fine_eviction_start; 573 for (size_t k = 0; k < _fine_eviction_sample_size; k++) { 574 size_t ii = i; 575 // Make sure we get a non-NULL sample. 576 while (_fine_grain_regions[ii] == NULL) { 577 ii++; 578 if (ii == _max_fine_entries) ii = 0; 579 guarantee(ii != i, "We must find one."); 580 } 581 PerRegionTable** prev = &_fine_grain_regions[ii]; 582 PerRegionTable* cur = *prev; 583 while (cur != NULL) { 584 jint cur_occ = cur->occupied(); 585 if (max == NULL || cur_occ > max_occ) { 586 max = cur; 587 max_prev = prev; 588 max_ind = i; 589 max_occ = cur_occ; 590 } 591 prev = cur->collision_list_next_addr(); 592 cur = cur->collision_list_next(); 593 } 594 i = i + _fine_eviction_stride; 595 if (i >= _n_fine_entries) i = i - _n_fine_entries; 596 } 597 598 _fine_eviction_start++; 599 600 if (_fine_eviction_start >= _n_fine_entries) { 601 _fine_eviction_start -= _n_fine_entries; 602 } 603 604 guarantee(max != NULL, "Since _n_fine_entries > 0"); 605 606 // Set the corresponding coarse bit. 607 size_t max_hrs_index = (size_t) max->hr()->hrs_index(); 608 if (!_coarse_map.at(max_hrs_index)) { 609 _coarse_map.at_put(max_hrs_index, true); 610 _n_coarse_entries++; 611 if (G1TraceHeapRegionRememberedSet) { 612 gclog_or_tty->print("Coarsened entry in region [" PTR_FORMAT "...] " 613 "for region [" PTR_FORMAT "...] (%d coarse entries).\n", 614 hr()->bottom(), 615 max->hr()->bottom(), 616 _n_coarse_entries); 617 } 618 } 619 620 // Unsplice. 621 *max_prev = max->collision_list_next(); 622 Atomic::inc(&_n_coarsenings); 623 _n_fine_entries--; 624 return max; 625 } 626 627 628 // At present, this must be called stop-world single-threaded. 629 void OtherRegionsTable::scrub(CardTableModRefBS* ctbs, 630 BitMap* region_bm, BitMap* card_bm) { 631 // First eliminated garbage regions from the coarse map. 632 if (G1RSScrubVerbose) { 633 gclog_or_tty->print_cr("Scrubbing region %u:", hr()->hrs_index()); 634 } 635 636 assert(_coarse_map.size() == region_bm->size(), "Precondition"); 637 if (G1RSScrubVerbose) { 638 gclog_or_tty->print(" Coarse map: before = "SIZE_FORMAT"...", 639 _n_coarse_entries); 640 } 641 _coarse_map.set_intersection(*region_bm); 642 _n_coarse_entries = _coarse_map.count_one_bits(); 643 if (G1RSScrubVerbose) { 644 gclog_or_tty->print_cr(" after = "SIZE_FORMAT".", _n_coarse_entries); 645 } 646 647 // Now do the fine-grained maps. 648 for (size_t i = 0; i < _max_fine_entries; i++) { 649 PerRegionTable* cur = _fine_grain_regions[i]; 650 PerRegionTable** prev = &_fine_grain_regions[i]; 651 while (cur != NULL) { 652 PerRegionTable* nxt = cur->collision_list_next(); 653 // If the entire region is dead, eliminate. 654 if (G1RSScrubVerbose) { 655 gclog_or_tty->print_cr(" For other region %u:", 656 cur->hr()->hrs_index()); 657 } 658 if (!region_bm->at((size_t) cur->hr()->hrs_index())) { 659 *prev = nxt; 660 cur->set_collision_list_next(NULL); 661 _n_fine_entries--; 662 if (G1RSScrubVerbose) { 663 gclog_or_tty->print_cr(" deleted via region map."); 664 } 665 unlink_from_all(cur); 666 PerRegionTable::free(cur); 667 } else { 668 // Do fine-grain elimination. 669 if (G1RSScrubVerbose) { 670 gclog_or_tty->print(" occ: before = %4d.", cur->occupied()); 671 } 672 cur->scrub(ctbs, card_bm); 673 if (G1RSScrubVerbose) { 674 gclog_or_tty->print_cr(" after = %4d.", cur->occupied()); 675 } 676 // Did that empty the table completely? 677 if (cur->occupied() == 0) { 678 *prev = nxt; 679 cur->set_collision_list_next(NULL); 680 _n_fine_entries--; 681 unlink_from_all(cur); 682 PerRegionTable::free(cur); 683 } else { 684 prev = cur->collision_list_next_addr(); 685 } 686 } 687 cur = nxt; 688 } 689 } 690 // Since we may have deleted a from_card_cache entry from the RS, clear 691 // the FCC. 692 clear_fcc(); 693 } 694 695 696 size_t OtherRegionsTable::occupied() const { 697 size_t sum = occ_fine(); 698 sum += occ_sparse(); 699 sum += occ_coarse(); 700 return sum; 701 } 702 703 size_t OtherRegionsTable::occ_fine() const { 704 size_t sum = 0; 705 706 size_t num = 0; 707 PerRegionTable * cur = _first_all_fine_prts; 708 while (cur != NULL) { 709 sum += cur->occupied(); 710 cur = cur->next(); 711 num++; 712 } 713 guarantee(num == _n_fine_entries, "just checking"); 714 return sum; 715 } 716 717 size_t OtherRegionsTable::occ_coarse() const { 718 return (_n_coarse_entries * HeapRegion::CardsPerRegion); 719 } 720 721 size_t OtherRegionsTable::occ_sparse() const { 722 return _sparse_table.occupied(); 723 } 724 725 size_t OtherRegionsTable::mem_size() const { 726 size_t sum = 0; 727 // all PRTs are of the same size so it is sufficient to query only one of them. 728 if (_first_all_fine_prts != NULL) { 729 assert(_last_all_fine_prts != NULL && 730 _first_all_fine_prts->mem_size() == _last_all_fine_prts->mem_size(), "check that mem_size() is constant"); 731 sum += _first_all_fine_prts->mem_size() * _n_fine_entries; 732 } 733 sum += (sizeof(PerRegionTable*) * _max_fine_entries); 734 sum += (_coarse_map.size_in_words() * HeapWordSize); 735 sum += (_sparse_table.mem_size()); 736 sum += sizeof(*this) - sizeof(_sparse_table); // Avoid double counting above. 737 return sum; 738 } 739 740 size_t OtherRegionsTable::static_mem_size() { 741 return FromCardCache::static_mem_size(); 742 } 743 744 size_t OtherRegionsTable::fl_mem_size() { 745 return PerRegionTable::fl_mem_size(); 746 } 747 748 void OtherRegionsTable::clear_fcc() { 749 FromCardCache::clear(hr()->hrs_index()); 750 } 751 752 void OtherRegionsTable::clear() { 753 // if there are no entries, skip this step 754 if (_first_all_fine_prts != NULL) { 755 guarantee(_first_all_fine_prts != NULL && _last_all_fine_prts != NULL, "just checking"); 756 PerRegionTable::bulk_free(_first_all_fine_prts, _last_all_fine_prts); 757 memset(_fine_grain_regions, 0, _max_fine_entries * sizeof(_fine_grain_regions[0])); 758 } else { 759 guarantee(_first_all_fine_prts == NULL && _last_all_fine_prts == NULL, "just checking"); 760 } 761 762 _first_all_fine_prts = _last_all_fine_prts = NULL; 763 _sparse_table.clear(); 764 _coarse_map.clear(); 765 _n_fine_entries = 0; 766 _n_coarse_entries = 0; 767 768 clear_fcc(); 769 } 770 771 void OtherRegionsTable::clear_incoming_entry(HeapRegion* from_hr) { 772 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); 773 size_t hrs_ind = (size_t) from_hr->hrs_index(); 774 size_t ind = hrs_ind & _mod_max_fine_entries_mask; 775 if (del_single_region_table(ind, from_hr)) { 776 assert(!_coarse_map.at(hrs_ind), "Inv"); 777 } else { 778 _coarse_map.par_at_put(hrs_ind, 0); 779 } 780 // Check to see if any of the fcc entries come from here. 781 uint hr_ind = hr()->hrs_index(); 782 for (uint tid = 0; tid < HeapRegionRemSet::num_par_rem_sets(); tid++) { 783 int fcc_ent = FromCardCache::at(tid, hr_ind); 784 if (fcc_ent != FromCardCache::InvalidCard) { 785 HeapWord* card_addr = (HeapWord*) 786 (uintptr_t(fcc_ent) << CardTableModRefBS::card_shift); 787 if (hr()->is_in_reserved(card_addr)) { 788 // Clear the from card cache. 789 FromCardCache::set(tid, hr_ind, FromCardCache::InvalidCard); 790 } 791 } 792 } 793 } 794 795 bool OtherRegionsTable::del_single_region_table(size_t ind, 796 HeapRegion* hr) { 797 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); 798 PerRegionTable** prev_addr = &_fine_grain_regions[ind]; 799 PerRegionTable* prt = *prev_addr; 800 while (prt != NULL && prt->hr() != hr) { 801 prev_addr = prt->collision_list_next_addr(); 802 prt = prt->collision_list_next(); 803 } 804 if (prt != NULL) { 805 assert(prt->hr() == hr, "Loop postcondition."); 806 *prev_addr = prt->collision_list_next(); 807 unlink_from_all(prt); 808 PerRegionTable::free(prt); 809 _n_fine_entries--; 810 return true; 811 } else { 812 return false; 813 } 814 } 815 816 bool OtherRegionsTable::contains_reference(OopOrNarrowOopStar from) const { 817 // Cast away const in this case. 818 MutexLockerEx x((Mutex*)_m, Mutex::_no_safepoint_check_flag); 819 return contains_reference_locked(from); 820 } 821 822 bool OtherRegionsTable::contains_reference_locked(OopOrNarrowOopStar from) const { 823 HeapRegion* hr = _g1h->heap_region_containing_raw(from); 824 if (hr == NULL) return false; 825 RegionIdx_t hr_ind = (RegionIdx_t) hr->hrs_index(); 826 // Is this region in the coarse map? 827 if (_coarse_map.at(hr_ind)) return true; 828 829 PerRegionTable* prt = find_region_table(hr_ind & _mod_max_fine_entries_mask, 830 hr); 831 if (prt != NULL) { 832 return prt->contains_reference(from); 833 834 } else { 835 uintptr_t from_card = 836 (uintptr_t(from) >> CardTableModRefBS::card_shift); 837 uintptr_t hr_bot_card_index = 838 uintptr_t(hr->bottom()) >> CardTableModRefBS::card_shift; 839 assert(from_card >= hr_bot_card_index, "Inv"); 840 CardIdx_t card_index = from_card - hr_bot_card_index; 841 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, 842 "Must be in range."); 843 return _sparse_table.contains_card(hr_ind, card_index); 844 } 845 } 846 847 void 848 OtherRegionsTable::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { 849 _sparse_table.do_cleanup_work(hrrs_cleanup_task); 850 } 851 852 // Determines how many threads can add records to an rset in parallel. 853 // This can be done by either mutator threads together with the 854 // concurrent refinement threads or GC threads. 855 uint HeapRegionRemSet::num_par_rem_sets() { 856 return MAX2(DirtyCardQueueSet::num_par_ids() + ConcurrentG1Refine::thread_num(), (uint)ParallelGCThreads); 857 } 858 859 HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, 860 HeapRegion* hr) 861 : _bosa(bosa), 862 _m(Mutex::leaf, FormatBuffer<128>("HeapRegionRemSet lock #%u", hr->hrs_index()), true), 863 _code_roots(), _other_regions(hr, &_m) { 864 reset_for_par_iteration(); 865 } 866 867 void HeapRegionRemSet::setup_remset_size() { 868 // Setup sparse and fine-grain tables sizes. 869 // table_size = base * (log(region_size / 1M) + 1) 870 const int LOG_M = 20; 871 int region_size_log_mb = MAX2(HeapRegion::LogOfHRGrainBytes - LOG_M, 0); 872 if (FLAG_IS_DEFAULT(G1RSetSparseRegionEntries)) { 873 G1RSetSparseRegionEntries = G1RSetSparseRegionEntriesBase * (region_size_log_mb + 1); 874 } 875 if (FLAG_IS_DEFAULT(G1RSetRegionEntries)) { 876 G1RSetRegionEntries = G1RSetRegionEntriesBase * (region_size_log_mb + 1); 877 } 878 guarantee(G1RSetSparseRegionEntries > 0 && G1RSetRegionEntries > 0 , "Sanity"); 879 } 880 881 bool HeapRegionRemSet::claim_iter() { 882 if (_iter_state != Unclaimed) return false; 883 jint res = Atomic::cmpxchg(Claimed, (jint*)(&_iter_state), Unclaimed); 884 return (res == Unclaimed); 885 } 886 887 void HeapRegionRemSet::set_iter_complete() { 888 _iter_state = Complete; 889 } 890 891 bool HeapRegionRemSet::iter_is_complete() { 892 return _iter_state == Complete; 893 } 894 895 #ifndef PRODUCT 896 void HeapRegionRemSet::print() { 897 HeapRegionRemSetIterator iter(this); 898 size_t card_index; 899 while (iter.has_next(card_index)) { 900 HeapWord* card_start = 901 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); 902 gclog_or_tty->print_cr(" Card " PTR_FORMAT, card_start); 903 } 904 if (iter.n_yielded() != occupied()) { 905 gclog_or_tty->print_cr("Yielded disagrees with occupied:"); 906 gclog_or_tty->print_cr(" %6d yielded (%6d coarse, %6d fine).", 907 iter.n_yielded(), 908 iter.n_yielded_coarse(), iter.n_yielded_fine()); 909 gclog_or_tty->print_cr(" %6d occ (%6d coarse, %6d fine).", 910 occupied(), occ_coarse(), occ_fine()); 911 } 912 guarantee(iter.n_yielded() == occupied(), 913 "We should have yielded all the represented cards."); 914 } 915 #endif 916 917 void HeapRegionRemSet::cleanup() { 918 SparsePRT::cleanup_all(); 919 } 920 921 void HeapRegionRemSet::clear() { 922 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); 923 clear_locked(); 924 } 925 926 void HeapRegionRemSet::clear_locked() { 927 _code_roots.clear(); 928 _other_regions.clear(); 929 assert(occupied_locked() == 0, "Should be clear."); 930 reset_for_par_iteration(); 931 } 932 933 void HeapRegionRemSet::reset_for_par_iteration() { 934 _iter_state = Unclaimed; 935 _iter_claimed = 0; 936 // It's good to check this to make sure that the two methods are in sync. 937 assert(verify_ready_for_par_iteration(), "post-condition"); 938 } 939 940 void HeapRegionRemSet::scrub(CardTableModRefBS* ctbs, 941 BitMap* region_bm, BitMap* card_bm) { 942 _other_regions.scrub(ctbs, region_bm, card_bm); 943 } 944 945 // Code roots support 946 947 void HeapRegionRemSet::add_strong_code_root(nmethod* nm) { 948 assert(nm != NULL, "sanity"); 949 _code_roots.add(nm); 950 } 951 952 void HeapRegionRemSet::remove_strong_code_root(nmethod* nm) { 953 assert(nm != NULL, "sanity"); 954 _code_roots.remove(nm); 955 // Check that there were no duplicates 956 guarantee(!_code_roots.contains(nm), "duplicate entry found"); 957 } 958 959 class NMethodMigrationOopClosure : public OopClosure { 960 G1CollectedHeap* _g1h; 961 HeapRegion* _from; 962 nmethod* _nm; 963 964 uint _num_self_forwarded; 965 966 template <class T> void do_oop_work(T* p) { 967 T heap_oop = oopDesc::load_heap_oop(p); 968 if (!oopDesc::is_null(heap_oop)) { 969 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); 970 if (_from->is_in(obj)) { 971 // Reference still points into the source region. 972 // Since roots are immediately evacuated this means that 973 // we must have self forwarded the object 974 assert(obj->is_forwarded(), 975 err_msg("code roots should be immediately evacuated. " 976 "Ref: "PTR_FORMAT", " 977 "Obj: "PTR_FORMAT", " 978 "Region: "HR_FORMAT, 979 p, (void*) obj, HR_FORMAT_PARAMS(_from))); 980 assert(obj->forwardee() == obj, 981 err_msg("not self forwarded? obj = "PTR_FORMAT, (void*)obj)); 982 983 // The object has been self forwarded. 984 // Note, if we're during an initial mark pause, there is 985 // no need to explicitly mark object. It will be marked 986 // during the regular evacuation failure handling code. 987 _num_self_forwarded++; 988 } else { 989 // The reference points into a promotion or to-space region 990 HeapRegion* to = _g1h->heap_region_containing(obj); 991 to->rem_set()->add_strong_code_root(_nm); 992 } 993 } 994 } 995 996 public: 997 NMethodMigrationOopClosure(G1CollectedHeap* g1h, HeapRegion* from, nmethod* nm): 998 _g1h(g1h), _from(from), _nm(nm), _num_self_forwarded(0) {} 999 1000 void do_oop(narrowOop* p) { do_oop_work(p); } 1001 void do_oop(oop* p) { do_oop_work(p); } 1002 1003 uint retain() { return _num_self_forwarded > 0; } 1004 }; 1005 1006 void HeapRegionRemSet::migrate_strong_code_roots() { 1007 assert(hr()->in_collection_set(), "only collection set regions"); 1008 assert(!hr()->isHumongous(), 1009 err_msg("humongous region "HR_FORMAT" should not have been added to the collection set", 1010 HR_FORMAT_PARAMS(hr()))); 1011 1012 ResourceMark rm; 1013 1014 // List of code blobs to retain for this region 1015 GrowableArray<nmethod*> to_be_retained(10); 1016 G1CollectedHeap* g1h = G1CollectedHeap::heap(); 1017 1018 while (!_code_roots.is_empty()) { 1019 nmethod *nm = _code_roots.pop(); 1020 if (nm != NULL) { 1021 NMethodMigrationOopClosure oop_cl(g1h, hr(), nm); 1022 nm->oops_do(&oop_cl); 1023 if (oop_cl.retain()) { 1024 to_be_retained.push(nm); 1025 } 1026 } 1027 } 1028 1029 // Now push any code roots we need to retain 1030 assert(to_be_retained.is_empty() || hr()->evacuation_failed(), 1031 "Retained nmethod list must be empty or " 1032 "evacuation of this region failed"); 1033 1034 while (to_be_retained.is_nonempty()) { 1035 nmethod* nm = to_be_retained.pop(); 1036 assert(nm != NULL, "sanity"); 1037 add_strong_code_root(nm); 1038 } 1039 } 1040 1041 void HeapRegionRemSet::strong_code_roots_do(CodeBlobClosure* blk) const { 1042 _code_roots.nmethods_do(blk); 1043 } 1044 1045 size_t HeapRegionRemSet::strong_code_roots_mem_size() { 1046 return _code_roots.mem_size(); 1047 } 1048 1049 HeapRegionRemSetIterator:: HeapRegionRemSetIterator(HeapRegionRemSet* hrrs) : 1050 _hrrs(hrrs), 1051 _g1h(G1CollectedHeap::heap()), 1052 _coarse_map(&hrrs->_other_regions._coarse_map), 1053 _bosa(hrrs->bosa()), 1054 _is(Sparse), 1055 // Set these values so that we increment to the first region. 1056 _coarse_cur_region_index(-1), 1057 _coarse_cur_region_cur_card(HeapRegion::CardsPerRegion-1), 1058 _cur_region_cur_card((size_t)HeapRegion::CardsPerRegion), 1059 _fine_cur_prt(NULL), 1060 _n_yielded_coarse(0), 1061 _n_yielded_fine(0), 1062 _n_yielded_sparse(0), 1063 _sparse_iter(&hrrs->_other_regions._sparse_table) {} 1064 1065 bool HeapRegionRemSetIterator::coarse_has_next(size_t& card_index) { 1066 if (_hrrs->_other_regions._n_coarse_entries == 0) return false; 1067 // Go to the next card. 1068 _coarse_cur_region_cur_card++; 1069 // Was the last the last card in the current region? 1070 if (_coarse_cur_region_cur_card == HeapRegion::CardsPerRegion) { 1071 // Yes: find the next region. This may leave _coarse_cur_region_index 1072 // Set to the last index, in which case there are no more coarse 1073 // regions. 1074 _coarse_cur_region_index = 1075 (int) _coarse_map->get_next_one_offset(_coarse_cur_region_index + 1); 1076 if ((size_t)_coarse_cur_region_index < _coarse_map->size()) { 1077 _coarse_cur_region_cur_card = 0; 1078 HeapWord* r_bot = 1079 _g1h->region_at((uint) _coarse_cur_region_index)->bottom(); 1080 _cur_region_card_offset = _bosa->index_for(r_bot); 1081 } else { 1082 return false; 1083 } 1084 } 1085 // If we didn't return false above, then we can yield a card. 1086 card_index = _cur_region_card_offset + _coarse_cur_region_cur_card; 1087 return true; 1088 } 1089 1090 bool HeapRegionRemSetIterator::fine_has_next(size_t& card_index) { 1091 if (fine_has_next()) { 1092 _cur_region_cur_card = 1093 _fine_cur_prt->_bm.get_next_one_offset(_cur_region_cur_card + 1); 1094 } 1095 if (_cur_region_cur_card == (size_t)HeapRegion::CardsPerRegion) { 1096 // _fine_cur_prt may still be NULL in case if there are not PRTs at all for 1097 // the remembered set. 1098 if (_fine_cur_prt == NULL || _fine_cur_prt->next() == NULL) { 1099 return false; 1100 } 1101 PerRegionTable* next_prt = _fine_cur_prt->next(); 1102 switch_to_next_prt(next_prt); 1103 _cur_region_cur_card = _fine_cur_prt->_bm.get_next_one_offset(_cur_region_cur_card + 1); 1104 } 1105 1106 card_index = _cur_region_card_offset + _cur_region_cur_card; 1107 guarantee(_cur_region_cur_card < HeapRegion::CardsPerRegion, "card index must be within heap"); 1108 return true; 1109 } 1110 1111 bool HeapRegionRemSetIterator::fine_has_next() { 1112 return _cur_region_cur_card != (size_t)HeapRegion::CardsPerRegion; 1113 } 1114 1115 void HeapRegionRemSetIterator::switch_to_next_prt(PerRegionTable* prt) { 1116 assert(prt != NULL, "Cannot switch to NULL prt"); 1117 _fine_cur_prt = prt; 1118 1119 HeapWord* r_bot = _fine_cur_prt->hr()->bottom(); 1120 _cur_region_card_offset = _bosa->index_for(r_bot); 1121 1122 _cur_region_cur_card = (size_t)-1; 1123 } 1124 1125 bool HeapRegionRemSetIterator::has_next(size_t& card_index) { 1126 switch (_is) { 1127 case Sparse: { 1128 if (_sparse_iter.has_next(card_index)) { 1129 _n_yielded_sparse++; 1130 return true; 1131 } 1132 // Otherwise, deliberate fall-through 1133 _is = Fine; 1134 PerRegionTable* initial_fine_prt = _hrrs->_other_regions._first_all_fine_prts; 1135 if (initial_fine_prt != NULL) { 1136 switch_to_next_prt(_hrrs->_other_regions._first_all_fine_prts); 1137 } 1138 } 1139 case Fine: 1140 if (fine_has_next(card_index)) { 1141 _n_yielded_fine++; 1142 return true; 1143 } 1144 // Otherwise, deliberate fall-through 1145 _is = Coarse; 1146 case Coarse: 1147 if (coarse_has_next(card_index)) { 1148 _n_yielded_coarse++; 1149 return true; 1150 } 1151 // Otherwise... 1152 break; 1153 } 1154 assert(ParallelGCThreads > 1 || 1155 n_yielded() == _hrrs->occupied(), 1156 "Should have yielded all the cards in the rem set " 1157 "(in the non-par case)."); 1158 return false; 1159 } 1160 1161 1162 1163 OopOrNarrowOopStar* HeapRegionRemSet::_recorded_oops = NULL; 1164 HeapWord** HeapRegionRemSet::_recorded_cards = NULL; 1165 HeapRegion** HeapRegionRemSet::_recorded_regions = NULL; 1166 int HeapRegionRemSet::_n_recorded = 0; 1167 1168 HeapRegionRemSet::Event* HeapRegionRemSet::_recorded_events = NULL; 1169 int* HeapRegionRemSet::_recorded_event_index = NULL; 1170 int HeapRegionRemSet::_n_recorded_events = 0; 1171 1172 void HeapRegionRemSet::record(HeapRegion* hr, OopOrNarrowOopStar f) { 1173 if (_recorded_oops == NULL) { 1174 assert(_n_recorded == 0 1175 && _recorded_cards == NULL 1176 && _recorded_regions == NULL, 1177 "Inv"); 1178 _recorded_oops = NEW_C_HEAP_ARRAY(OopOrNarrowOopStar, MaxRecorded, mtGC); 1179 _recorded_cards = NEW_C_HEAP_ARRAY(HeapWord*, MaxRecorded, mtGC); 1180 _recorded_regions = NEW_C_HEAP_ARRAY(HeapRegion*, MaxRecorded, mtGC); 1181 } 1182 if (_n_recorded == MaxRecorded) { 1183 gclog_or_tty->print_cr("Filled up 'recorded' (%d).", MaxRecorded); 1184 } else { 1185 _recorded_cards[_n_recorded] = 1186 (HeapWord*)align_size_down(uintptr_t(f), 1187 CardTableModRefBS::card_size); 1188 _recorded_oops[_n_recorded] = f; 1189 _recorded_regions[_n_recorded] = hr; 1190 _n_recorded++; 1191 } 1192 } 1193 1194 void HeapRegionRemSet::record_event(Event evnt) { 1195 if (!G1RecordHRRSEvents) return; 1196 1197 if (_recorded_events == NULL) { 1198 assert(_n_recorded_events == 0 1199 && _recorded_event_index == NULL, 1200 "Inv"); 1201 _recorded_events = NEW_C_HEAP_ARRAY(Event, MaxRecordedEvents, mtGC); 1202 _recorded_event_index = NEW_C_HEAP_ARRAY(int, MaxRecordedEvents, mtGC); 1203 } 1204 if (_n_recorded_events == MaxRecordedEvents) { 1205 gclog_or_tty->print_cr("Filled up 'recorded_events' (%d).", MaxRecordedEvents); 1206 } else { 1207 _recorded_events[_n_recorded_events] = evnt; 1208 _recorded_event_index[_n_recorded_events] = _n_recorded; 1209 _n_recorded_events++; 1210 } 1211 } 1212 1213 void HeapRegionRemSet::print_event(outputStream* str, Event evnt) { 1214 switch (evnt) { 1215 case Event_EvacStart: 1216 str->print("Evac Start"); 1217 break; 1218 case Event_EvacEnd: 1219 str->print("Evac End"); 1220 break; 1221 case Event_RSUpdateEnd: 1222 str->print("RS Update End"); 1223 break; 1224 } 1225 } 1226 1227 void HeapRegionRemSet::print_recorded() { 1228 int cur_evnt = 0; 1229 Event cur_evnt_kind; 1230 int cur_evnt_ind = 0; 1231 if (_n_recorded_events > 0) { 1232 cur_evnt_kind = _recorded_events[cur_evnt]; 1233 cur_evnt_ind = _recorded_event_index[cur_evnt]; 1234 } 1235 1236 for (int i = 0; i < _n_recorded; i++) { 1237 while (cur_evnt < _n_recorded_events && i == cur_evnt_ind) { 1238 gclog_or_tty->print("Event: "); 1239 print_event(gclog_or_tty, cur_evnt_kind); 1240 gclog_or_tty->print_cr(""); 1241 cur_evnt++; 1242 if (cur_evnt < MaxRecordedEvents) { 1243 cur_evnt_kind = _recorded_events[cur_evnt]; 1244 cur_evnt_ind = _recorded_event_index[cur_evnt]; 1245 } 1246 } 1247 gclog_or_tty->print("Added card " PTR_FORMAT " to region [" PTR_FORMAT "...]" 1248 " for ref " PTR_FORMAT ".\n", 1249 _recorded_cards[i], _recorded_regions[i]->bottom(), 1250 _recorded_oops[i]); 1251 } 1252 } 1253 1254 void HeapRegionRemSet::reset_for_cleanup_tasks() { 1255 SparsePRT::reset_for_cleanup_tasks(); 1256 } 1257 1258 void HeapRegionRemSet::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { 1259 _other_regions.do_cleanup_work(hrrs_cleanup_task); 1260 } 1261 1262 void 1263 HeapRegionRemSet::finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task) { 1264 SparsePRT::finish_cleanup_task(hrrs_cleanup_task); 1265 } 1266 1267 #ifndef PRODUCT 1268 void PerRegionTable::test_fl_mem_size() { 1269 PerRegionTable* dummy = alloc(NULL); 1270 free(dummy); 1271 guarantee(dummy->mem_size() == fl_mem_size(), "fl_mem_size() does not return the correct element size"); 1272 // try to reset the state 1273 _free_list = NULL; 1274 delete dummy; 1275 } 1276 1277 void HeapRegionRemSet::test_prt() { 1278 PerRegionTable::test_fl_mem_size(); 1279 } 1280 1281 void HeapRegionRemSet::test() { 1282 os::sleep(Thread::current(), (jlong)5000, false); 1283 G1CollectedHeap* g1h = G1CollectedHeap::heap(); 1284 1285 // Run with "-XX:G1LogRSetRegionEntries=2", so that 1 and 5 end up in same 1286 // hash bucket. 1287 HeapRegion* hr0 = g1h->region_at(0); 1288 HeapRegion* hr1 = g1h->region_at(1); 1289 HeapRegion* hr2 = g1h->region_at(5); 1290 HeapRegion* hr3 = g1h->region_at(6); 1291 HeapRegion* hr4 = g1h->region_at(7); 1292 HeapRegion* hr5 = g1h->region_at(8); 1293 1294 HeapWord* hr1_start = hr1->bottom(); 1295 HeapWord* hr1_mid = hr1_start + HeapRegion::GrainWords/2; 1296 HeapWord* hr1_last = hr1->end() - 1; 1297 1298 HeapWord* hr2_start = hr2->bottom(); 1299 HeapWord* hr2_mid = hr2_start + HeapRegion::GrainWords/2; 1300 HeapWord* hr2_last = hr2->end() - 1; 1301 1302 HeapWord* hr3_start = hr3->bottom(); 1303 HeapWord* hr3_mid = hr3_start + HeapRegion::GrainWords/2; 1304 HeapWord* hr3_last = hr3->end() - 1; 1305 1306 HeapRegionRemSet* hrrs = hr0->rem_set(); 1307 1308 // Make three references from region 0x101... 1309 hrrs->add_reference((OopOrNarrowOopStar)hr1_start); 1310 hrrs->add_reference((OopOrNarrowOopStar)hr1_mid); 1311 hrrs->add_reference((OopOrNarrowOopStar)hr1_last); 1312 1313 hrrs->add_reference((OopOrNarrowOopStar)hr2_start); 1314 hrrs->add_reference((OopOrNarrowOopStar)hr2_mid); 1315 hrrs->add_reference((OopOrNarrowOopStar)hr2_last); 1316 1317 hrrs->add_reference((OopOrNarrowOopStar)hr3_start); 1318 hrrs->add_reference((OopOrNarrowOopStar)hr3_mid); 1319 hrrs->add_reference((OopOrNarrowOopStar)hr3_last); 1320 1321 // Now cause a coarsening. 1322 hrrs->add_reference((OopOrNarrowOopStar)hr4->bottom()); 1323 hrrs->add_reference((OopOrNarrowOopStar)hr5->bottom()); 1324 1325 // Now, does iteration yield these three? 1326 HeapRegionRemSetIterator iter(hrrs); 1327 size_t sum = 0; 1328 size_t card_index; 1329 while (iter.has_next(card_index)) { 1330 HeapWord* card_start = 1331 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); 1332 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); 1333 sum++; 1334 } 1335 guarantee(sum == 11 - 3 + 2048, "Failure"); 1336 guarantee(sum == hrrs->occupied(), "Failure"); 1337 } 1338 #endif