Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp @ 10193:d58c62b7447d
Merge
| author | mgerdin |
|---|---|
| date | Thu, 02 May 2013 19:28:59 +0200 |
| parents | caac22686b17 746b070f5022 |
| children | f9be75d21404 05a17f270c7e |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 10135 | 2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
| 27 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" | |
| 28 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 29 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
| 30 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
| 31 #include "memory/allocation.hpp" | |
| 32 #include "memory/space.inline.hpp" | |
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33 #include "oops/oop.inline.hpp" |
| 1972 | 34 #include "utilities/bitMap.inline.hpp" |
| 35 #include "utilities/globalDefinitions.hpp" | |
| 342 | 36 |
| 6197 | 37 class PerRegionTable: public CHeapObj<mtGC> { |
| 342 | 38 friend class OtherRegionsTable; |
| 39 friend class HeapRegionRemSetIterator; | |
| 40 | |
| 41 HeapRegion* _hr; | |
| 42 BitMap _bm; | |
| 43 jint _occupied; | |
| 44 | |
| 6253 | 45 // next pointer for free/allocated 'all' list |
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46 PerRegionTable* _next; |
| 342 | 47 |
| 6253 | 48 // prev pointer for the allocated 'all' list |
| 49 PerRegionTable* _prev; | |
| 342 | 50 |
| 6253 | 51 // next pointer in collision list |
| 52 PerRegionTable * _collision_list_next; | |
| 342 | 53 |
| 6253 | 54 // Global free list of PRTs |
| 55 static PerRegionTable* _free_list; | |
| 342 | 56 |
| 57 protected: | |
| 58 // We need access in order to union things into the base table. | |
| 59 BitMap* bm() { return &_bm; } | |
| 60 | |
| 61 void recount_occupied() { | |
| 62 _occupied = (jint) bm()->count_one_bits(); | |
| 63 } | |
| 64 | |
| 65 PerRegionTable(HeapRegion* hr) : | |
| 66 _hr(hr), | |
| 67 _occupied(0), | |
| 6253 | 68 _bm(HeapRegion::CardsPerRegion, false /* in-resource-area */), |
| 69 _collision_list_next(NULL), _next(NULL), _prev(NULL) | |
| 342 | 70 {} |
| 71 | |
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72 void add_card_work(CardIdx_t from_card, bool par) { |
| 342 | 73 if (!_bm.at(from_card)) { |
| 74 if (par) { | |
| 75 if (_bm.par_at_put(from_card, 1)) { | |
| 76 Atomic::inc(&_occupied); | |
| 77 } | |
| 78 } else { | |
| 79 _bm.at_put(from_card, 1); | |
| 80 _occupied++; | |
| 81 } | |
| 82 } | |
| 83 } | |
| 84 | |
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85 void add_reference_work(OopOrNarrowOopStar from, bool par) { |
| 342 | 86 // Must make this robust in case "from" is not in "_hr", because of |
| 87 // concurrency. | |
| 88 | |
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89 if (G1TraceHeapRegionRememberedSet) { |
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90 gclog_or_tty->print_cr(" PRT::Add_reference_work(" PTR_FORMAT "->" PTR_FORMAT").", |
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91 from, |
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92 UseCompressedOops |
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93 ? oopDesc::load_decode_heap_oop((narrowOop*)from) |
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94 : oopDesc::load_decode_heap_oop((oop*)from)); |
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95 } |
| 342 | 96 |
| 97 HeapRegion* loc_hr = hr(); | |
| 98 // If the test below fails, then this table was reused concurrently | |
| 99 // with this operation. This is OK, since the old table was coarsened, | |
| 100 // and adding a bit to the new table is never incorrect. | |
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101 // If the table used to belong to a continues humongous region and is |
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102 // now reused for the corresponding start humongous region, we need to |
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103 // make sure that we detect this. Thus, we call is_in_reserved_raw() |
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104 // instead of just is_in_reserved() here. |
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105 if (loc_hr->is_in_reserved_raw(from)) { |
| 342 | 106 size_t hw_offset = pointer_delta((HeapWord*)from, loc_hr->bottom()); |
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107 CardIdx_t from_card = (CardIdx_t) |
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108 hw_offset >> (CardTableModRefBS::card_shift - LogHeapWordSize); |
| 342 | 109 |
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110 assert(0 <= from_card && (size_t)from_card < HeapRegion::CardsPerRegion, |
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111 "Must be in range."); |
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112 add_card_work(from_card, par); |
| 342 | 113 } |
| 114 } | |
| 115 | |
| 116 public: | |
| 117 | |
| 118 HeapRegion* hr() const { return _hr; } | |
| 119 | |
| 120 jint occupied() const { | |
| 121 // Overkill, but if we ever need it... | |
| 122 // guarantee(_occupied == _bm.count_one_bits(), "Check"); | |
| 123 return _occupied; | |
| 124 } | |
| 125 | |
| 6253 | 126 void init(HeapRegion* hr, bool clear_links_to_all_list) { |
| 127 if (clear_links_to_all_list) { | |
| 128 set_next(NULL); | |
| 129 set_prev(NULL); | |
| 130 } | |
| 342 | 131 _hr = hr; |
| 6253 | 132 _collision_list_next = NULL; |
| 342 | 133 _occupied = 0; |
| 134 _bm.clear(); | |
| 135 } | |
| 136 | |
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137 void add_reference(OopOrNarrowOopStar from) { |
| 342 | 138 add_reference_work(from, /*parallel*/ true); |
| 139 } | |
| 140 | |
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141 void seq_add_reference(OopOrNarrowOopStar from) { |
| 342 | 142 add_reference_work(from, /*parallel*/ false); |
| 143 } | |
| 144 | |
| 145 void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { | |
| 146 HeapWord* hr_bot = hr()->bottom(); | |
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147 size_t hr_first_card_index = ctbs->index_for(hr_bot); |
| 342 | 148 bm()->set_intersection_at_offset(*card_bm, hr_first_card_index); |
| 149 recount_occupied(); | |
| 150 } | |
| 151 | |
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152 void add_card(CardIdx_t from_card_index) { |
| 342 | 153 add_card_work(from_card_index, /*parallel*/ true); |
| 154 } | |
| 155 | |
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156 void seq_add_card(CardIdx_t from_card_index) { |
| 342 | 157 add_card_work(from_card_index, /*parallel*/ false); |
| 158 } | |
| 159 | |
| 160 // (Destructively) union the bitmap of the current table into the given | |
| 161 // bitmap (which is assumed to be of the same size.) | |
| 162 void union_bitmap_into(BitMap* bm) { | |
| 163 bm->set_union(_bm); | |
| 164 } | |
| 165 | |
| 166 // Mem size in bytes. | |
| 167 size_t mem_size() const { | |
| 168 return sizeof(this) + _bm.size_in_words() * HeapWordSize; | |
| 169 } | |
| 170 | |
| 171 // Requires "from" to be in "hr()". | |
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172 bool contains_reference(OopOrNarrowOopStar from) const { |
| 342 | 173 assert(hr()->is_in_reserved(from), "Precondition."); |
| 174 size_t card_ind = pointer_delta(from, hr()->bottom(), | |
| 175 CardTableModRefBS::card_size); | |
| 176 return _bm.at(card_ind); | |
| 177 } | |
| 178 | |
| 6253 | 179 // Bulk-free the PRTs from prt to last, assumes that they are |
| 180 // linked together using their _next field. | |
| 181 static void bulk_free(PerRegionTable* prt, PerRegionTable* last) { | |
| 342 | 182 while (true) { |
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183 PerRegionTable* fl = _free_list; |
| 6253 | 184 last->set_next(fl); |
| 185 PerRegionTable* res = (PerRegionTable*) Atomic::cmpxchg_ptr(prt, &_free_list, fl); | |
| 186 if (res == fl) { | |
| 187 return; | |
| 188 } | |
| 342 | 189 } |
| 190 ShouldNotReachHere(); | |
| 191 } | |
| 192 | |
| 6253 | 193 static void free(PerRegionTable* prt) { |
| 194 bulk_free(prt, prt); | |
| 195 } | |
| 196 | |
| 197 // Returns an initialized PerRegionTable instance. | |
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198 static PerRegionTable* alloc(HeapRegion* hr) { |
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199 PerRegionTable* fl = _free_list; |
| 342 | 200 while (fl != NULL) { |
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201 PerRegionTable* nxt = fl->next(); |
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202 PerRegionTable* res = |
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203 (PerRegionTable*) |
| 342 | 204 Atomic::cmpxchg_ptr(nxt, &_free_list, fl); |
| 205 if (res == fl) { | |
| 6253 | 206 fl->init(hr, true); |
| 342 | 207 return fl; |
| 208 } else { | |
| 209 fl = _free_list; | |
| 210 } | |
| 211 } | |
| 212 assert(fl == NULL, "Loop condition."); | |
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213 return new PerRegionTable(hr); |
| 342 | 214 } |
| 215 | |
| 6253 | 216 PerRegionTable* next() const { return _next; } |
| 217 void set_next(PerRegionTable* next) { _next = next; } | |
| 218 PerRegionTable* prev() const { return _prev; } | |
| 219 void set_prev(PerRegionTable* prev) { _prev = prev; } | |
| 220 | |
| 221 // Accessor and Modification routines for the pointer for the | |
| 222 // singly linked collision list that links the PRTs within the | |
| 223 // OtherRegionsTable::_fine_grain_regions hash table. | |
| 224 // | |
| 225 // It might be useful to also make the collision list doubly linked | |
| 226 // to avoid iteration over the collisions list during scrubbing/deletion. | |
| 227 // OTOH there might not be many collisions. | |
| 228 | |
| 229 PerRegionTable* collision_list_next() const { | |
| 230 return _collision_list_next; | |
| 231 } | |
| 232 | |
| 233 void set_collision_list_next(PerRegionTable* next) { | |
| 234 _collision_list_next = next; | |
| 235 } | |
| 236 | |
| 237 PerRegionTable** collision_list_next_addr() { | |
| 238 return &_collision_list_next; | |
| 239 } | |
| 240 | |
| 342 | 241 static size_t fl_mem_size() { |
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242 PerRegionTable* cur = _free_list; |
| 342 | 243 size_t res = 0; |
| 244 while (cur != NULL) { | |
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245 res += sizeof(PerRegionTable); |
| 342 | 246 cur = cur->next(); |
| 247 } | |
| 248 return res; | |
| 249 } | |
| 250 }; | |
| 251 | |
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252 PerRegionTable* PerRegionTable::_free_list = NULL; |
| 342 | 253 |
| 254 size_t OtherRegionsTable::_max_fine_entries = 0; | |
| 255 size_t OtherRegionsTable::_mod_max_fine_entries_mask = 0; | |
| 256 size_t OtherRegionsTable::_fine_eviction_stride = 0; | |
| 257 size_t OtherRegionsTable::_fine_eviction_sample_size = 0; | |
| 258 | |
| 259 OtherRegionsTable::OtherRegionsTable(HeapRegion* hr) : | |
| 260 _g1h(G1CollectedHeap::heap()), | |
| 261 _m(Mutex::leaf, "An OtherRegionsTable lock", true), | |
| 262 _hr(hr), | |
| 263 _coarse_map(G1CollectedHeap::heap()->max_regions(), | |
| 264 false /* in-resource-area */), | |
| 265 _fine_grain_regions(NULL), | |
| 6253 | 266 _first_all_fine_prts(NULL), _last_all_fine_prts(NULL), |
| 342 | 267 _n_fine_entries(0), _n_coarse_entries(0), |
| 268 _fine_eviction_start(0), | |
| 269 _sparse_table(hr) | |
| 270 { | |
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271 typedef PerRegionTable* PerRegionTablePtr; |
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272 |
| 342 | 273 if (_max_fine_entries == 0) { |
| 274 assert(_mod_max_fine_entries_mask == 0, "Both or none."); | |
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275 size_t max_entries_log = (size_t)log2_long((jlong)G1RSetRegionEntries); |
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276 _max_fine_entries = (size_t)1 << max_entries_log; |
| 342 | 277 _mod_max_fine_entries_mask = _max_fine_entries - 1; |
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278 |
| 342 | 279 assert(_fine_eviction_sample_size == 0 |
| 280 && _fine_eviction_stride == 0, "All init at same time."); | |
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281 _fine_eviction_sample_size = MAX2((size_t)4, max_entries_log); |
| 342 | 282 _fine_eviction_stride = _max_fine_entries / _fine_eviction_sample_size; |
| 283 } | |
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284 |
| 10135 | 285 _fine_grain_regions = new PerRegionTablePtr[_max_fine_entries]; |
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286 |
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287 if (_fine_grain_regions == NULL) { |
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288 vm_exit_out_of_memory(sizeof(void*)*_max_fine_entries, OOM_MALLOC_ERROR, |
| 342 | 289 "Failed to allocate _fine_grain_entries."); |
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290 } |
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291 |
| 342 | 292 for (size_t i = 0; i < _max_fine_entries; i++) { |
| 293 _fine_grain_regions[i] = NULL; | |
| 294 } | |
| 295 } | |
| 296 | |
| 6253 | 297 void OtherRegionsTable::link_to_all(PerRegionTable* prt) { |
| 298 // We always append to the beginning of the list for convenience; | |
| 299 // the order of entries in this list does not matter. | |
| 300 if (_first_all_fine_prts != NULL) { | |
| 301 assert(_first_all_fine_prts->prev() == NULL, "invariant"); | |
| 302 _first_all_fine_prts->set_prev(prt); | |
| 303 prt->set_next(_first_all_fine_prts); | |
| 304 } else { | |
| 305 // this is the first element we insert. Adjust the "last" pointer | |
| 306 _last_all_fine_prts = prt; | |
| 307 assert(prt->next() == NULL, "just checking"); | |
| 308 } | |
| 309 // the new element is always the first element without a predecessor | |
| 310 prt->set_prev(NULL); | |
| 311 _first_all_fine_prts = prt; | |
| 312 | |
| 313 assert(prt->prev() == NULL, "just checking"); | |
| 314 assert(_first_all_fine_prts == prt, "just checking"); | |
| 315 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || | |
| 316 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), | |
| 317 "just checking"); | |
| 318 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, | |
| 319 "just checking"); | |
| 320 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, | |
| 321 "just checking"); | |
| 322 } | |
| 323 | |
| 324 void OtherRegionsTable::unlink_from_all(PerRegionTable* prt) { | |
| 325 if (prt->prev() != NULL) { | |
| 326 assert(_first_all_fine_prts != prt, "just checking"); | |
| 327 prt->prev()->set_next(prt->next()); | |
| 328 // removing the last element in the list? | |
| 329 if (_last_all_fine_prts == prt) { | |
| 330 _last_all_fine_prts = prt->prev(); | |
| 331 } | |
| 332 } else { | |
| 333 assert(_first_all_fine_prts == prt, "just checking"); | |
| 334 _first_all_fine_prts = prt->next(); | |
| 335 // list is empty now? | |
| 336 if (_first_all_fine_prts == NULL) { | |
| 337 _last_all_fine_prts = NULL; | |
| 338 } | |
| 339 } | |
| 340 | |
| 341 if (prt->next() != NULL) { | |
| 342 prt->next()->set_prev(prt->prev()); | |
| 343 } | |
| 344 | |
| 345 prt->set_next(NULL); | |
| 346 prt->set_prev(NULL); | |
| 347 | |
| 348 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || | |
| 349 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), | |
| 350 "just checking"); | |
| 351 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, | |
| 352 "just checking"); | |
| 353 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, | |
| 354 "just checking"); | |
| 355 } | |
| 356 | |
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357 int** OtherRegionsTable::_from_card_cache = NULL; |
| 342 | 358 size_t OtherRegionsTable::_from_card_cache_max_regions = 0; |
| 359 size_t OtherRegionsTable::_from_card_cache_mem_size = 0; | |
| 360 | |
| 361 void OtherRegionsTable::init_from_card_cache(size_t max_regions) { | |
| 362 _from_card_cache_max_regions = max_regions; | |
| 363 | |
| 364 int n_par_rs = HeapRegionRemSet::num_par_rem_sets(); | |
| 6197 | 365 _from_card_cache = NEW_C_HEAP_ARRAY(int*, n_par_rs, mtGC); |
| 342 | 366 for (int i = 0; i < n_par_rs; i++) { |
| 6197 | 367 _from_card_cache[i] = NEW_C_HEAP_ARRAY(int, max_regions, mtGC); |
| 342 | 368 for (size_t j = 0; j < max_regions; j++) { |
| 369 _from_card_cache[i][j] = -1; // An invalid value. | |
| 370 } | |
| 371 } | |
| 372 _from_card_cache_mem_size = n_par_rs * max_regions * sizeof(int); | |
| 373 } | |
| 374 | |
| 375 void OtherRegionsTable::shrink_from_card_cache(size_t new_n_regs) { | |
| 376 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
| 377 assert(new_n_regs <= _from_card_cache_max_regions, "Must be within max."); | |
| 378 for (size_t j = new_n_regs; j < _from_card_cache_max_regions; j++) { | |
| 379 _from_card_cache[i][j] = -1; // An invalid value. | |
| 380 } | |
| 381 } | |
| 382 } | |
| 383 | |
| 384 #ifndef PRODUCT | |
| 385 void OtherRegionsTable::print_from_card_cache() { | |
| 386 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
| 387 for (size_t j = 0; j < _from_card_cache_max_regions; j++) { | |
| 388 gclog_or_tty->print_cr("_from_card_cache[%d][%d] = %d.", | |
| 389 i, j, _from_card_cache[i][j]); | |
| 390 } | |
| 391 } | |
| 392 } | |
| 393 #endif | |
| 394 | |
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395 void OtherRegionsTable::add_reference(OopOrNarrowOopStar from, int tid) { |
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396 size_t cur_hrs_ind = (size_t) hr()->hrs_index(); |
| 342 | 397 |
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398 if (G1TraceHeapRegionRememberedSet) { |
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399 gclog_or_tty->print_cr("ORT::add_reference_work(" PTR_FORMAT "->" PTR_FORMAT ").", |
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400 from, |
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401 UseCompressedOops |
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402 ? oopDesc::load_decode_heap_oop((narrowOop*)from) |
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403 : oopDesc::load_decode_heap_oop((oop*)from)); |
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404 } |
| 342 | 405 |
| 406 int from_card = (int)(uintptr_t(from) >> CardTableModRefBS::card_shift); | |
| 407 | |
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408 if (G1TraceHeapRegionRememberedSet) { |
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409 gclog_or_tty->print_cr("Table for [" PTR_FORMAT "...): card %d (cache = %d)", |
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410 hr()->bottom(), from_card, |
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411 _from_card_cache[tid][cur_hrs_ind]); |
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412 } |
| 342 | 413 |
| 414 if (from_card == _from_card_cache[tid][cur_hrs_ind]) { | |
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415 if (G1TraceHeapRegionRememberedSet) { |
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416 gclog_or_tty->print_cr(" from-card cache hit."); |
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417 } |
| 342 | 418 assert(contains_reference(from), "We just added it!"); |
| 419 return; | |
| 420 } else { | |
| 421 _from_card_cache[tid][cur_hrs_ind] = from_card; | |
| 422 } | |
| 423 | |
| 424 // Note that this may be a continued H region. | |
| 425 HeapRegion* from_hr = _g1h->heap_region_containing_raw(from); | |
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426 RegionIdx_t from_hrs_ind = (RegionIdx_t) from_hr->hrs_index(); |
| 342 | 427 |
| 428 // If the region is already coarsened, return. | |
| 429 if (_coarse_map.at(from_hrs_ind)) { | |
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430 if (G1TraceHeapRegionRememberedSet) { |
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431 gclog_or_tty->print_cr(" coarse map hit."); |
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432 } |
| 342 | 433 assert(contains_reference(from), "We just added it!"); |
| 434 return; | |
| 435 } | |
| 436 | |
| 437 // Otherwise find a per-region table to add it to. | |
| 438 size_t ind = from_hrs_ind & _mod_max_fine_entries_mask; | |
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439 PerRegionTable* prt = find_region_table(ind, from_hr); |
| 342 | 440 if (prt == NULL) { |
| 441 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
| 442 // Confirm that it's really not there... | |
| 443 prt = find_region_table(ind, from_hr); | |
| 444 if (prt == NULL) { | |
| 445 | |
| 446 uintptr_t from_hr_bot_card_index = | |
| 447 uintptr_t(from_hr->bottom()) | |
| 448 >> CardTableModRefBS::card_shift; | |
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449 CardIdx_t card_index = from_card - from_hr_bot_card_index; |
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450 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
| 342 | 451 "Must be in range."); |
| 452 if (G1HRRSUseSparseTable && | |
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453 _sparse_table.add_card(from_hrs_ind, card_index)) { |
| 342 | 454 if (G1RecordHRRSOops) { |
| 455 HeapRegionRemSet::record(hr(), from); | |
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456 if (G1TraceHeapRegionRememberedSet) { |
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457 gclog_or_tty->print(" Added card " PTR_FORMAT " to region " |
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458 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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459 align_size_down(uintptr_t(from), |
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460 CardTableModRefBS::card_size), |
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461 hr()->bottom(), from); |
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462 } |
| 342 | 463 } |
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464 if (G1TraceHeapRegionRememberedSet) { |
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465 gclog_or_tty->print_cr(" added card to sparse table."); |
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466 } |
| 342 | 467 assert(contains_reference_locked(from), "We just added it!"); |
| 468 return; | |
| 469 } else { | |
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470 if (G1TraceHeapRegionRememberedSet) { |
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471 gclog_or_tty->print_cr(" [tid %d] sparse table entry " |
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472 "overflow(f: %d, t: %d)", |
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473 tid, from_hrs_ind, cur_hrs_ind); |
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474 } |
| 342 | 475 } |
| 476 | |
| 477 if (_n_fine_entries == _max_fine_entries) { | |
| 478 prt = delete_region_table(); | |
| 6253 | 479 // There is no need to clear the links to the 'all' list here: |
| 480 // prt will be reused immediately, i.e. remain in the 'all' list. | |
| 481 prt->init(from_hr, false /* clear_links_to_all_list */); | |
| 342 | 482 } else { |
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483 prt = PerRegionTable::alloc(from_hr); |
| 6253 | 484 link_to_all(prt); |
| 342 | 485 } |
| 486 | |
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487 PerRegionTable* first_prt = _fine_grain_regions[ind]; |
| 6253 | 488 prt->set_collision_list_next(first_prt); |
| 342 | 489 _fine_grain_regions[ind] = prt; |
| 490 _n_fine_entries++; | |
| 491 | |
| 492 if (G1HRRSUseSparseTable) { | |
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493 // Transfer from sparse to fine-grain. |
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494 SparsePRTEntry *sprt_entry = _sparse_table.get_entry(from_hrs_ind); |
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495 assert(sprt_entry != NULL, "There should have been an entry"); |
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496 for (int i = 0; i < SparsePRTEntry::cards_num(); i++) { |
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497 CardIdx_t c = sprt_entry->card(i); |
| 342 | 498 if (c != SparsePRTEntry::NullEntry) { |
| 499 prt->add_card(c); | |
| 500 } | |
| 501 } | |
| 502 // Now we can delete the sparse entry. | |
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503 bool res = _sparse_table.delete_entry(from_hrs_ind); |
| 342 | 504 assert(res, "It should have been there."); |
| 505 } | |
| 506 } | |
| 507 assert(prt != NULL && prt->hr() == from_hr, "consequence"); | |
| 508 } | |
| 509 // Note that we can't assert "prt->hr() == from_hr", because of the | |
| 510 // possibility of concurrent reuse. But see head comment of | |
| 511 // OtherRegionsTable for why this is OK. | |
| 512 assert(prt != NULL, "Inv"); | |
| 513 | |
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514 prt->add_reference(from); |
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515 |
| 342 | 516 if (G1RecordHRRSOops) { |
| 517 HeapRegionRemSet::record(hr(), from); | |
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518 if (G1TraceHeapRegionRememberedSet) { |
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519 gclog_or_tty->print("Added card " PTR_FORMAT " to region " |
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520 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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521 align_size_down(uintptr_t(from), |
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522 CardTableModRefBS::card_size), |
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523 hr()->bottom(), from); |
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524 } |
| 342 | 525 } |
| 526 assert(contains_reference(from), "We just added it!"); | |
| 527 } | |
| 528 | |
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529 PerRegionTable* |
| 342 | 530 OtherRegionsTable::find_region_table(size_t ind, HeapRegion* hr) const { |
| 531 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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532 PerRegionTable* prt = _fine_grain_regions[ind]; |
| 342 | 533 while (prt != NULL && prt->hr() != hr) { |
| 6253 | 534 prt = prt->collision_list_next(); |
| 342 | 535 } |
| 536 // Loop postcondition is the method postcondition. | |
| 537 return prt; | |
| 538 } | |
| 539 | |
| 540 jint OtherRegionsTable::_n_coarsenings = 0; | |
| 541 | |
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542 PerRegionTable* OtherRegionsTable::delete_region_table() { |
| 342 | 543 assert(_m.owned_by_self(), "Precondition"); |
| 544 assert(_n_fine_entries == _max_fine_entries, "Precondition"); | |
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545 PerRegionTable* max = NULL; |
| 342 | 546 jint max_occ = 0; |
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547 PerRegionTable** max_prev; |
| 342 | 548 size_t max_ind; |
| 549 | |
| 550 size_t i = _fine_eviction_start; | |
| 551 for (size_t k = 0; k < _fine_eviction_sample_size; k++) { | |
| 552 size_t ii = i; | |
| 553 // Make sure we get a non-NULL sample. | |
| 554 while (_fine_grain_regions[ii] == NULL) { | |
| 555 ii++; | |
| 556 if (ii == _max_fine_entries) ii = 0; | |
| 557 guarantee(ii != i, "We must find one."); | |
| 558 } | |
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559 PerRegionTable** prev = &_fine_grain_regions[ii]; |
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560 PerRegionTable* cur = *prev; |
| 342 | 561 while (cur != NULL) { |
| 562 jint cur_occ = cur->occupied(); | |
| 563 if (max == NULL || cur_occ > max_occ) { | |
| 564 max = cur; | |
| 565 max_prev = prev; | |
| 566 max_ind = i; | |
| 567 max_occ = cur_occ; | |
| 568 } | |
| 6253 | 569 prev = cur->collision_list_next_addr(); |
| 570 cur = cur->collision_list_next(); | |
| 342 | 571 } |
| 572 i = i + _fine_eviction_stride; | |
| 573 if (i >= _n_fine_entries) i = i - _n_fine_entries; | |
| 574 } | |
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575 |
| 342 | 576 _fine_eviction_start++; |
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577 |
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578 if (_fine_eviction_start >= _n_fine_entries) { |
| 342 | 579 _fine_eviction_start -= _n_fine_entries; |
| 580 } | |
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581 |
| 342 | 582 guarantee(max != NULL, "Since _n_fine_entries > 0"); |
| 583 | |
| 584 // Set the corresponding coarse bit. | |
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585 size_t max_hrs_index = (size_t) max->hr()->hrs_index(); |
| 342 | 586 if (!_coarse_map.at(max_hrs_index)) { |
| 587 _coarse_map.at_put(max_hrs_index, true); | |
| 588 _n_coarse_entries++; | |
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589 if (G1TraceHeapRegionRememberedSet) { |
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590 gclog_or_tty->print("Coarsened entry in region [" PTR_FORMAT "...] " |
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591 "for region [" PTR_FORMAT "...] (%d coarse entries).\n", |
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592 hr()->bottom(), |
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593 max->hr()->bottom(), |
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594 _n_coarse_entries); |
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595 } |
| 342 | 596 } |
| 597 | |
| 598 // Unsplice. | |
| 6253 | 599 *max_prev = max->collision_list_next(); |
| 342 | 600 Atomic::inc(&_n_coarsenings); |
| 601 _n_fine_entries--; | |
| 602 return max; | |
| 603 } | |
| 604 | |
| 605 | |
| 606 // At present, this must be called stop-world single-threaded. | |
| 607 void OtherRegionsTable::scrub(CardTableModRefBS* ctbs, | |
| 608 BitMap* region_bm, BitMap* card_bm) { | |
| 609 // First eliminated garbage regions from the coarse map. | |
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610 if (G1RSScrubVerbose) { |
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611 gclog_or_tty->print_cr("Scrubbing region %u:", hr()->hrs_index()); |
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612 } |
| 342 | 613 |
| 614 assert(_coarse_map.size() == region_bm->size(), "Precondition"); | |
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615 if (G1RSScrubVerbose) { |
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616 gclog_or_tty->print(" Coarse map: before = "SIZE_FORMAT"...", |
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617 _n_coarse_entries); |
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618 } |
| 342 | 619 _coarse_map.set_intersection(*region_bm); |
| 620 _n_coarse_entries = _coarse_map.count_one_bits(); | |
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621 if (G1RSScrubVerbose) { |
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622 gclog_or_tty->print_cr(" after = "SIZE_FORMAT".", _n_coarse_entries); |
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623 } |
| 342 | 624 |
| 625 // Now do the fine-grained maps. | |
| 626 for (size_t i = 0; i < _max_fine_entries; i++) { | |
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627 PerRegionTable* cur = _fine_grain_regions[i]; |
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628 PerRegionTable** prev = &_fine_grain_regions[i]; |
| 342 | 629 while (cur != NULL) { |
| 6253 | 630 PerRegionTable* nxt = cur->collision_list_next(); |
| 342 | 631 // If the entire region is dead, eliminate. |
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632 if (G1RSScrubVerbose) { |
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633 gclog_or_tty->print_cr(" For other region %u:", |
| 3766 | 634 cur->hr()->hrs_index()); |
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635 } |
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636 if (!region_bm->at((size_t) cur->hr()->hrs_index())) { |
| 342 | 637 *prev = nxt; |
| 6253 | 638 cur->set_collision_list_next(NULL); |
| 342 | 639 _n_fine_entries--; |
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640 if (G1RSScrubVerbose) { |
| 342 | 641 gclog_or_tty->print_cr(" deleted via region map."); |
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642 } |
| 6253 | 643 unlink_from_all(cur); |
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644 PerRegionTable::free(cur); |
| 342 | 645 } else { |
| 646 // Do fine-grain elimination. | |
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647 if (G1RSScrubVerbose) { |
| 342 | 648 gclog_or_tty->print(" occ: before = %4d.", cur->occupied()); |
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649 } |
| 342 | 650 cur->scrub(ctbs, card_bm); |
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651 if (G1RSScrubVerbose) { |
| 342 | 652 gclog_or_tty->print_cr(" after = %4d.", cur->occupied()); |
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653 } |
| 342 | 654 // Did that empty the table completely? |
| 655 if (cur->occupied() == 0) { | |
| 656 *prev = nxt; | |
| 6253 | 657 cur->set_collision_list_next(NULL); |
| 342 | 658 _n_fine_entries--; |
| 6253 | 659 unlink_from_all(cur); |
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660 PerRegionTable::free(cur); |
| 342 | 661 } else { |
| 6253 | 662 prev = cur->collision_list_next_addr(); |
| 342 | 663 } |
| 664 } | |
| 665 cur = nxt; | |
| 666 } | |
| 667 } | |
| 668 // Since we may have deleted a from_card_cache entry from the RS, clear | |
| 669 // the FCC. | |
| 670 clear_fcc(); | |
| 671 } | |
| 672 | |
| 673 | |
| 674 size_t OtherRegionsTable::occupied() const { | |
| 675 // Cast away const in this case. | |
| 676 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
| 677 size_t sum = occ_fine(); | |
| 678 sum += occ_sparse(); | |
| 679 sum += occ_coarse(); | |
| 680 return sum; | |
| 681 } | |
| 682 | |
| 683 size_t OtherRegionsTable::occ_fine() const { | |
| 684 size_t sum = 0; | |
| 6253 | 685 |
| 686 size_t num = 0; | |
| 687 PerRegionTable * cur = _first_all_fine_prts; | |
| 688 while (cur != NULL) { | |
| 689 sum += cur->occupied(); | |
| 690 cur = cur->next(); | |
| 691 num++; | |
| 342 | 692 } |
| 6253 | 693 guarantee(num == _n_fine_entries, "just checking"); |
| 342 | 694 return sum; |
| 695 } | |
| 696 | |
| 697 size_t OtherRegionsTable::occ_coarse() const { | |
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698 return (_n_coarse_entries * HeapRegion::CardsPerRegion); |
| 342 | 699 } |
| 700 | |
| 701 size_t OtherRegionsTable::occ_sparse() const { | |
| 702 return _sparse_table.occupied(); | |
| 703 } | |
| 704 | |
| 705 size_t OtherRegionsTable::mem_size() const { | |
| 706 // Cast away const in this case. | |
| 707 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
| 708 size_t sum = 0; | |
| 6253 | 709 PerRegionTable * cur = _first_all_fine_prts; |
| 710 while (cur != NULL) { | |
| 711 sum += cur->mem_size(); | |
| 712 cur = cur->next(); | |
| 342 | 713 } |
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714 sum += (sizeof(PerRegionTable*) * _max_fine_entries); |
| 342 | 715 sum += (_coarse_map.size_in_words() * HeapWordSize); |
| 716 sum += (_sparse_table.mem_size()); | |
| 717 sum += sizeof(*this) - sizeof(_sparse_table); // Avoid double counting above. | |
| 718 return sum; | |
| 719 } | |
| 720 | |
| 721 size_t OtherRegionsTable::static_mem_size() { | |
| 722 return _from_card_cache_mem_size; | |
| 723 } | |
| 724 | |
| 725 size_t OtherRegionsTable::fl_mem_size() { | |
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726 return PerRegionTable::fl_mem_size(); |
| 342 | 727 } |
| 728 | |
| 729 void OtherRegionsTable::clear_fcc() { | |
| 6253 | 730 size_t hrs_idx = hr()->hrs_index(); |
| 342 | 731 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { |
| 6253 | 732 _from_card_cache[i][hrs_idx] = -1; |
| 342 | 733 } |
| 734 } | |
| 735 | |
| 736 void OtherRegionsTable::clear() { | |
| 737 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
| 6253 | 738 // if there are no entries, skip this step |
| 739 if (_first_all_fine_prts != NULL) { | |
| 740 guarantee(_first_all_fine_prts != NULL && _last_all_fine_prts != NULL, "just checking"); | |
| 741 PerRegionTable::bulk_free(_first_all_fine_prts, _last_all_fine_prts); | |
| 742 memset(_fine_grain_regions, 0, _max_fine_entries * sizeof(_fine_grain_regions[0])); | |
| 743 } else { | |
| 744 guarantee(_first_all_fine_prts == NULL && _last_all_fine_prts == NULL, "just checking"); | |
| 342 | 745 } |
| 6253 | 746 |
| 747 _first_all_fine_prts = _last_all_fine_prts = NULL; | |
| 342 | 748 _sparse_table.clear(); |
| 749 _coarse_map.clear(); | |
| 750 _n_fine_entries = 0; | |
| 751 _n_coarse_entries = 0; | |
| 752 | |
| 753 clear_fcc(); | |
| 754 } | |
| 755 | |
| 756 void OtherRegionsTable::clear_incoming_entry(HeapRegion* from_hr) { | |
| 757 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
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758 size_t hrs_ind = (size_t) from_hr->hrs_index(); |
| 342 | 759 size_t ind = hrs_ind & _mod_max_fine_entries_mask; |
| 760 if (del_single_region_table(ind, from_hr)) { | |
| 761 assert(!_coarse_map.at(hrs_ind), "Inv"); | |
| 762 } else { | |
| 763 _coarse_map.par_at_put(hrs_ind, 0); | |
| 764 } | |
| 765 // Check to see if any of the fcc entries come from here. | |
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766 size_t hr_ind = (size_t) hr()->hrs_index(); |
| 342 | 767 for (int tid = 0; tid < HeapRegionRemSet::num_par_rem_sets(); tid++) { |
| 768 int fcc_ent = _from_card_cache[tid][hr_ind]; | |
| 769 if (fcc_ent != -1) { | |
| 770 HeapWord* card_addr = (HeapWord*) | |
| 771 (uintptr_t(fcc_ent) << CardTableModRefBS::card_shift); | |
| 772 if (hr()->is_in_reserved(card_addr)) { | |
| 773 // Clear the from card cache. | |
| 774 _from_card_cache[tid][hr_ind] = -1; | |
| 775 } | |
| 776 } | |
| 777 } | |
| 778 } | |
| 779 | |
| 780 bool OtherRegionsTable::del_single_region_table(size_t ind, | |
| 781 HeapRegion* hr) { | |
| 782 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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783 PerRegionTable** prev_addr = &_fine_grain_regions[ind]; |
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784 PerRegionTable* prt = *prev_addr; |
| 342 | 785 while (prt != NULL && prt->hr() != hr) { |
| 6253 | 786 prev_addr = prt->collision_list_next_addr(); |
| 787 prt = prt->collision_list_next(); | |
| 342 | 788 } |
| 789 if (prt != NULL) { | |
| 790 assert(prt->hr() == hr, "Loop postcondition."); | |
| 6253 | 791 *prev_addr = prt->collision_list_next(); |
| 792 unlink_from_all(prt); | |
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793 PerRegionTable::free(prt); |
| 342 | 794 _n_fine_entries--; |
| 795 return true; | |
| 796 } else { | |
| 797 return false; | |
| 798 } | |
| 799 } | |
| 800 | |
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801 bool OtherRegionsTable::contains_reference(OopOrNarrowOopStar from) const { |
| 342 | 802 // Cast away const in this case. |
| 803 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
| 804 return contains_reference_locked(from); | |
| 805 } | |
| 806 | |
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807 bool OtherRegionsTable::contains_reference_locked(OopOrNarrowOopStar from) const { |
| 342 | 808 HeapRegion* hr = _g1h->heap_region_containing_raw(from); |
| 809 if (hr == NULL) return false; | |
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810 RegionIdx_t hr_ind = (RegionIdx_t) hr->hrs_index(); |
| 342 | 811 // Is this region in the coarse map? |
| 812 if (_coarse_map.at(hr_ind)) return true; | |
| 813 | |
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814 PerRegionTable* prt = find_region_table(hr_ind & _mod_max_fine_entries_mask, |
| 342 | 815 hr); |
| 816 if (prt != NULL) { | |
| 817 return prt->contains_reference(from); | |
| 818 | |
| 819 } else { | |
| 820 uintptr_t from_card = | |
| 821 (uintptr_t(from) >> CardTableModRefBS::card_shift); | |
| 822 uintptr_t hr_bot_card_index = | |
| 823 uintptr_t(hr->bottom()) >> CardTableModRefBS::card_shift; | |
| 824 assert(from_card >= hr_bot_card_index, "Inv"); | |
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825 CardIdx_t card_index = from_card - hr_bot_card_index; |
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826 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
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827 "Must be in range."); |
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828 return _sparse_table.contains_card(hr_ind, card_index); |
| 342 | 829 } |
| 830 | |
| 831 | |
| 832 } | |
| 833 | |
| 2173 | 834 void |
| 835 OtherRegionsTable::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
| 836 _sparse_table.do_cleanup_work(hrrs_cleanup_task); | |
| 837 } | |
| 838 | |
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839 // Determines how many threads can add records to an rset in parallel. |
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840 // This can be done by either mutator threads together with the |
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841 // concurrent refinement threads or GC threads. |
| 342 | 842 int HeapRegionRemSet::num_par_rem_sets() { |
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843 return (int)MAX2(DirtyCardQueueSet::num_par_ids() + ConcurrentG1Refine::thread_num(), ParallelGCThreads); |
| 342 | 844 } |
| 845 | |
| 846 HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, | |
| 847 HeapRegion* hr) | |
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848 : _bosa(bosa), _other_regions(hr) { |
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849 reset_for_par_iteration(); |
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850 } |
| 342 | 851 |
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852 void HeapRegionRemSet::setup_remset_size() { |
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853 // Setup sparse and fine-grain tables sizes. |
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854 // table_size = base * (log(region_size / 1M) + 1) |
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855 const int LOG_M = 20; |
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856 int region_size_log_mb = MAX2(HeapRegion::LogOfHRGrainBytes - LOG_M, 0); |
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857 if (FLAG_IS_DEFAULT(G1RSetSparseRegionEntries)) { |
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858 G1RSetSparseRegionEntries = G1RSetSparseRegionEntriesBase * (region_size_log_mb + 1); |
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859 } |
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860 if (FLAG_IS_DEFAULT(G1RSetRegionEntries)) { |
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861 G1RSetRegionEntries = G1RSetRegionEntriesBase * (region_size_log_mb + 1); |
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862 } |
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863 guarantee(G1RSetSparseRegionEntries > 0 && G1RSetRegionEntries > 0 , "Sanity"); |
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864 } |
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865 |
| 342 | 866 bool HeapRegionRemSet::claim_iter() { |
| 867 if (_iter_state != Unclaimed) return false; | |
| 868 jint res = Atomic::cmpxchg(Claimed, (jint*)(&_iter_state), Unclaimed); | |
| 869 return (res == Unclaimed); | |
| 870 } | |
| 871 | |
| 872 void HeapRegionRemSet::set_iter_complete() { | |
| 873 _iter_state = Complete; | |
| 874 } | |
| 875 | |
| 876 bool HeapRegionRemSet::iter_is_complete() { | |
| 877 return _iter_state == Complete; | |
| 878 } | |
| 879 | |
| 880 #ifndef PRODUCT | |
| 881 void HeapRegionRemSet::print() const { | |
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882 HeapRegionRemSetIterator iter(this); |
| 342 | 883 size_t card_index; |
| 884 while (iter.has_next(card_index)) { | |
| 885 HeapWord* card_start = | |
| 886 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
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887 gclog_or_tty->print_cr(" Card " PTR_FORMAT, card_start); |
| 342 | 888 } |
| 889 if (iter.n_yielded() != occupied()) { | |
| 890 gclog_or_tty->print_cr("Yielded disagrees with occupied:"); | |
| 891 gclog_or_tty->print_cr(" %6d yielded (%6d coarse, %6d fine).", | |
| 892 iter.n_yielded(), | |
| 893 iter.n_yielded_coarse(), iter.n_yielded_fine()); | |
| 894 gclog_or_tty->print_cr(" %6d occ (%6d coarse, %6d fine).", | |
| 895 occupied(), occ_coarse(), occ_fine()); | |
| 896 } | |
| 897 guarantee(iter.n_yielded() == occupied(), | |
| 898 "We should have yielded all the represented cards."); | |
| 899 } | |
| 900 #endif | |
| 901 | |
| 902 void HeapRegionRemSet::cleanup() { | |
| 903 SparsePRT::cleanup_all(); | |
| 904 } | |
| 905 | |
| 906 void HeapRegionRemSet::clear() { | |
| 907 _other_regions.clear(); | |
| 908 assert(occupied() == 0, "Should be clear."); | |
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909 reset_for_par_iteration(); |
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910 } |
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911 |
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912 void HeapRegionRemSet::reset_for_par_iteration() { |
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913 _iter_state = Unclaimed; |
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914 _iter_claimed = 0; |
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915 // It's good to check this to make sure that the two methods are in sync. |
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916 assert(verify_ready_for_par_iteration(), "post-condition"); |
| 342 | 917 } |
| 918 | |
| 919 void HeapRegionRemSet::scrub(CardTableModRefBS* ctbs, | |
| 920 BitMap* region_bm, BitMap* card_bm) { | |
| 921 _other_regions.scrub(ctbs, region_bm, card_bm); | |
| 922 } | |
| 923 | |
| 924 //-------------------- Iteration -------------------- | |
| 925 | |
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926 HeapRegionRemSetIterator:: HeapRegionRemSetIterator(const HeapRegionRemSet* hrrs) : |
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927 _hrrs(hrrs), |
| 342 | 928 _g1h(G1CollectedHeap::heap()), |
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929 _coarse_map(&hrrs->_other_regions._coarse_map), |
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930 _fine_grain_regions(hrrs->_other_regions._fine_grain_regions), |
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931 _bosa(hrrs->bosa()), |
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932 _is(Sparse), |
| 342 | 933 // Set these values so that we increment to the first region. |
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934 _coarse_cur_region_index(-1), |
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935 _coarse_cur_region_cur_card(HeapRegion::CardsPerRegion-1), |
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936 _cur_region_cur_card(0), |
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937 _fine_array_index(-1), |
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938 _fine_cur_prt(NULL), |
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939 _n_yielded_coarse(0), |
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940 _n_yielded_fine(0), |
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941 _n_yielded_sparse(0), |
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942 _sparse_iter(&hrrs->_other_regions._sparse_table) {} |
| 342 | 943 |
| 944 bool HeapRegionRemSetIterator::coarse_has_next(size_t& card_index) { | |
| 945 if (_hrrs->_other_regions._n_coarse_entries == 0) return false; | |
| 946 // Go to the next card. | |
| 947 _coarse_cur_region_cur_card++; | |
| 948 // Was the last the last card in the current region? | |
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949 if (_coarse_cur_region_cur_card == HeapRegion::CardsPerRegion) { |
| 342 | 950 // Yes: find the next region. This may leave _coarse_cur_region_index |
| 951 // Set to the last index, in which case there are no more coarse | |
| 952 // regions. | |
| 953 _coarse_cur_region_index = | |
| 954 (int) _coarse_map->get_next_one_offset(_coarse_cur_region_index + 1); | |
| 955 if ((size_t)_coarse_cur_region_index < _coarse_map->size()) { | |
| 956 _coarse_cur_region_cur_card = 0; | |
| 957 HeapWord* r_bot = | |
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958 _g1h->region_at((uint) _coarse_cur_region_index)->bottom(); |
| 342 | 959 _cur_region_card_offset = _bosa->index_for(r_bot); |
| 960 } else { | |
| 961 return false; | |
| 962 } | |
| 963 } | |
| 964 // If we didn't return false above, then we can yield a card. | |
| 965 card_index = _cur_region_card_offset + _coarse_cur_region_cur_card; | |
| 966 return true; | |
| 967 } | |
| 968 | |
| 969 void HeapRegionRemSetIterator::fine_find_next_non_null_prt() { | |
| 970 // Otherwise, find the next bucket list in the array. | |
| 971 _fine_array_index++; | |
| 972 while (_fine_array_index < (int) OtherRegionsTable::_max_fine_entries) { | |
| 973 _fine_cur_prt = _fine_grain_regions[_fine_array_index]; | |
| 974 if (_fine_cur_prt != NULL) return; | |
| 975 else _fine_array_index++; | |
| 976 } | |
| 977 assert(_fine_cur_prt == NULL, "Loop post"); | |
| 978 } | |
| 979 | |
| 980 bool HeapRegionRemSetIterator::fine_has_next(size_t& card_index) { | |
| 981 if (fine_has_next()) { | |
| 982 _cur_region_cur_card = | |
| 983 _fine_cur_prt->_bm.get_next_one_offset(_cur_region_cur_card + 1); | |
| 984 } | |
| 985 while (!fine_has_next()) { | |
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986 if (_cur_region_cur_card == (size_t) HeapRegion::CardsPerRegion) { |
| 342 | 987 _cur_region_cur_card = 0; |
| 6253 | 988 _fine_cur_prt = _fine_cur_prt->collision_list_next(); |
| 342 | 989 } |
| 990 if (_fine_cur_prt == NULL) { | |
| 991 fine_find_next_non_null_prt(); | |
| 992 if (_fine_cur_prt == NULL) return false; | |
| 993 } | |
| 994 assert(_fine_cur_prt != NULL && _cur_region_cur_card == 0, | |
| 995 "inv."); | |
| 996 HeapWord* r_bot = | |
| 997 _fine_cur_prt->hr()->bottom(); | |
| 998 _cur_region_card_offset = _bosa->index_for(r_bot); | |
| 999 _cur_region_cur_card = _fine_cur_prt->_bm.get_next_one_offset(0); | |
| 1000 } | |
| 1001 assert(fine_has_next(), "Or else we exited the loop via the return."); | |
| 1002 card_index = _cur_region_card_offset + _cur_region_cur_card; | |
| 1003 return true; | |
| 1004 } | |
| 1005 | |
| 1006 bool HeapRegionRemSetIterator::fine_has_next() { | |
| 1007 return | |
| 1008 _fine_cur_prt != NULL && | |
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1009 _cur_region_cur_card < HeapRegion::CardsPerRegion; |
| 342 | 1010 } |
| 1011 | |
| 1012 bool HeapRegionRemSetIterator::has_next(size_t& card_index) { | |
| 1013 switch (_is) { | |
| 1014 case Sparse: | |
| 1015 if (_sparse_iter.has_next(card_index)) { | |
| 1016 _n_yielded_sparse++; | |
| 1017 return true; | |
| 1018 } | |
| 1019 // Otherwise, deliberate fall-through | |
| 1020 _is = Fine; | |
| 1021 case Fine: | |
| 1022 if (fine_has_next(card_index)) { | |
| 1023 _n_yielded_fine++; | |
| 1024 return true; | |
| 1025 } | |
| 1026 // Otherwise, deliberate fall-through | |
| 1027 _is = Coarse; | |
| 1028 case Coarse: | |
| 1029 if (coarse_has_next(card_index)) { | |
| 1030 _n_yielded_coarse++; | |
| 1031 return true; | |
| 1032 } | |
| 1033 // Otherwise... | |
| 1034 break; | |
| 1035 } | |
| 1036 assert(ParallelGCThreads > 1 || | |
| 1037 n_yielded() == _hrrs->occupied(), | |
| 1038 "Should have yielded all the cards in the rem set " | |
| 1039 "(in the non-par case)."); | |
| 1040 return false; | |
| 1041 } | |
| 1042 | |
| 1043 | |
| 1044 | |
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1045 OopOrNarrowOopStar* HeapRegionRemSet::_recorded_oops = NULL; |
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1046 HeapWord** HeapRegionRemSet::_recorded_cards = NULL; |
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1047 HeapRegion** HeapRegionRemSet::_recorded_regions = NULL; |
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1048 int HeapRegionRemSet::_n_recorded = 0; |
| 342 | 1049 |
| 1050 HeapRegionRemSet::Event* HeapRegionRemSet::_recorded_events = NULL; | |
| 1051 int* HeapRegionRemSet::_recorded_event_index = NULL; | |
| 1052 int HeapRegionRemSet::_n_recorded_events = 0; | |
| 1053 | |
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1054 void HeapRegionRemSet::record(HeapRegion* hr, OopOrNarrowOopStar f) { |
| 342 | 1055 if (_recorded_oops == NULL) { |
| 1056 assert(_n_recorded == 0 | |
| 1057 && _recorded_cards == NULL | |
| 1058 && _recorded_regions == NULL, | |
| 1059 "Inv"); | |
| 6197 | 1060 _recorded_oops = NEW_C_HEAP_ARRAY(OopOrNarrowOopStar, MaxRecorded, mtGC); |
| 1061 _recorded_cards = NEW_C_HEAP_ARRAY(HeapWord*, MaxRecorded, mtGC); | |
| 1062 _recorded_regions = NEW_C_HEAP_ARRAY(HeapRegion*, MaxRecorded, mtGC); | |
| 342 | 1063 } |
| 1064 if (_n_recorded == MaxRecorded) { | |
| 1065 gclog_or_tty->print_cr("Filled up 'recorded' (%d).", MaxRecorded); | |
| 1066 } else { | |
| 1067 _recorded_cards[_n_recorded] = | |
| 1068 (HeapWord*)align_size_down(uintptr_t(f), | |
| 1069 CardTableModRefBS::card_size); | |
| 1070 _recorded_oops[_n_recorded] = f; | |
| 1071 _recorded_regions[_n_recorded] = hr; | |
| 1072 _n_recorded++; | |
| 1073 } | |
| 1074 } | |
| 1075 | |
| 1076 void HeapRegionRemSet::record_event(Event evnt) { | |
| 1077 if (!G1RecordHRRSEvents) return; | |
| 1078 | |
| 1079 if (_recorded_events == NULL) { | |
| 1080 assert(_n_recorded_events == 0 | |
| 1081 && _recorded_event_index == NULL, | |
| 1082 "Inv"); | |
| 6197 | 1083 _recorded_events = NEW_C_HEAP_ARRAY(Event, MaxRecordedEvents, mtGC); |
| 1084 _recorded_event_index = NEW_C_HEAP_ARRAY(int, MaxRecordedEvents, mtGC); | |
| 342 | 1085 } |
| 1086 if (_n_recorded_events == MaxRecordedEvents) { | |
| 1087 gclog_or_tty->print_cr("Filled up 'recorded_events' (%d).", MaxRecordedEvents); | |
| 1088 } else { | |
| 1089 _recorded_events[_n_recorded_events] = evnt; | |
| 1090 _recorded_event_index[_n_recorded_events] = _n_recorded; | |
| 1091 _n_recorded_events++; | |
| 1092 } | |
| 1093 } | |
| 1094 | |
| 1095 void HeapRegionRemSet::print_event(outputStream* str, Event evnt) { | |
| 1096 switch (evnt) { | |
| 1097 case Event_EvacStart: | |
| 1098 str->print("Evac Start"); | |
| 1099 break; | |
| 1100 case Event_EvacEnd: | |
| 1101 str->print("Evac End"); | |
| 1102 break; | |
| 1103 case Event_RSUpdateEnd: | |
| 1104 str->print("RS Update End"); | |
| 1105 break; | |
| 1106 } | |
| 1107 } | |
| 1108 | |
| 1109 void HeapRegionRemSet::print_recorded() { | |
| 1110 int cur_evnt = 0; | |
| 1111 Event cur_evnt_kind; | |
| 1112 int cur_evnt_ind = 0; | |
| 1113 if (_n_recorded_events > 0) { | |
| 1114 cur_evnt_kind = _recorded_events[cur_evnt]; | |
| 1115 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
| 1116 } | |
| 1117 | |
| 1118 for (int i = 0; i < _n_recorded; i++) { | |
| 1119 while (cur_evnt < _n_recorded_events && i == cur_evnt_ind) { | |
| 1120 gclog_or_tty->print("Event: "); | |
| 1121 print_event(gclog_or_tty, cur_evnt_kind); | |
| 1122 gclog_or_tty->print_cr(""); | |
| 1123 cur_evnt++; | |
| 1124 if (cur_evnt < MaxRecordedEvents) { | |
| 1125 cur_evnt_kind = _recorded_events[cur_evnt]; | |
| 1126 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
| 1127 } | |
| 1128 } | |
| 1129 gclog_or_tty->print("Added card " PTR_FORMAT " to region [" PTR_FORMAT "...]" | |
| 1130 " for ref " PTR_FORMAT ".\n", | |
| 1131 _recorded_cards[i], _recorded_regions[i]->bottom(), | |
| 1132 _recorded_oops[i]); | |
| 1133 } | |
| 1134 } | |
| 1135 | |
| 2173 | 1136 void HeapRegionRemSet::reset_for_cleanup_tasks() { |
| 1137 SparsePRT::reset_for_cleanup_tasks(); | |
| 1138 } | |
| 1139 | |
| 1140 void HeapRegionRemSet::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
| 1141 _other_regions.do_cleanup_work(hrrs_cleanup_task); | |
| 1142 } | |
| 1143 | |
| 1144 void | |
| 1145 HeapRegionRemSet::finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task) { | |
| 1146 SparsePRT::finish_cleanup_task(hrrs_cleanup_task); | |
| 1147 } | |
| 1148 | |
| 342 | 1149 #ifndef PRODUCT |
| 1150 void HeapRegionRemSet::test() { | |
| 1151 os::sleep(Thread::current(), (jlong)5000, false); | |
| 1152 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1153 | |
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1154 // Run with "-XX:G1LogRSetRegionEntries=2", so that 1 and 5 end up in same |
| 342 | 1155 // hash bucket. |
| 1156 HeapRegion* hr0 = g1h->region_at(0); | |
| 1157 HeapRegion* hr1 = g1h->region_at(1); | |
| 1158 HeapRegion* hr2 = g1h->region_at(5); | |
| 1159 HeapRegion* hr3 = g1h->region_at(6); | |
| 1160 HeapRegion* hr4 = g1h->region_at(7); | |
| 1161 HeapRegion* hr5 = g1h->region_at(8); | |
| 1162 | |
| 1163 HeapWord* hr1_start = hr1->bottom(); | |
| 1164 HeapWord* hr1_mid = hr1_start + HeapRegion::GrainWords/2; | |
| 1165 HeapWord* hr1_last = hr1->end() - 1; | |
| 1166 | |
| 1167 HeapWord* hr2_start = hr2->bottom(); | |
| 1168 HeapWord* hr2_mid = hr2_start + HeapRegion::GrainWords/2; | |
| 1169 HeapWord* hr2_last = hr2->end() - 1; | |
| 1170 | |
| 1171 HeapWord* hr3_start = hr3->bottom(); | |
| 1172 HeapWord* hr3_mid = hr3_start + HeapRegion::GrainWords/2; | |
| 1173 HeapWord* hr3_last = hr3->end() - 1; | |
| 1174 | |
| 1175 HeapRegionRemSet* hrrs = hr0->rem_set(); | |
| 1176 | |
| 1177 // Make three references from region 0x101... | |
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1178 hrrs->add_reference((OopOrNarrowOopStar)hr1_start); |
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1179 hrrs->add_reference((OopOrNarrowOopStar)hr1_mid); |
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1180 hrrs->add_reference((OopOrNarrowOopStar)hr1_last); |
| 342 | 1181 |
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1182 hrrs->add_reference((OopOrNarrowOopStar)hr2_start); |
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1183 hrrs->add_reference((OopOrNarrowOopStar)hr2_mid); |
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1184 hrrs->add_reference((OopOrNarrowOopStar)hr2_last); |
| 342 | 1185 |
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1186 hrrs->add_reference((OopOrNarrowOopStar)hr3_start); |
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1187 hrrs->add_reference((OopOrNarrowOopStar)hr3_mid); |
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1188 hrrs->add_reference((OopOrNarrowOopStar)hr3_last); |
| 342 | 1189 |
| 1190 // Now cause a coarsening. | |
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1191 hrrs->add_reference((OopOrNarrowOopStar)hr4->bottom()); |
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1192 hrrs->add_reference((OopOrNarrowOopStar)hr5->bottom()); |
| 342 | 1193 |
| 1194 // Now, does iteration yield these three? | |
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1195 HeapRegionRemSetIterator iter(hrrs); |
| 342 | 1196 size_t sum = 0; |
| 1197 size_t card_index; | |
| 1198 while (iter.has_next(card_index)) { | |
| 1199 HeapWord* card_start = | |
| 1200 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
| 1201 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); | |
| 1202 sum++; | |
| 1203 } | |
| 1204 guarantee(sum == 11 - 3 + 2048, "Failure"); | |
| 1205 guarantee(sum == hrrs->occupied(), "Failure"); | |
| 1206 } | |
| 1207 #endif |