Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp @ 11979:8d4ff57af591
8022051: G1: Remove some unused G1 flags
Reviewed-by: tschatzl, jmasa
| author | brutisso |
|---|---|
| date | Thu, 01 Aug 2013 17:29:49 +0200 |
| parents | 6702da6b6082 |
| children | 5888334c9c24 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2013, 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 += cur->mem_size(); |
| 342 | 246 cur = cur->next(); |
| 247 } | |
| 248 return res; | |
| 249 } | |
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250 |
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251 static void test_fl_mem_size(); |
| 342 | 252 }; |
| 253 | |
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254 PerRegionTable* PerRegionTable::_free_list = NULL; |
| 342 | 255 |
| 256 size_t OtherRegionsTable::_max_fine_entries = 0; | |
| 257 size_t OtherRegionsTable::_mod_max_fine_entries_mask = 0; | |
| 258 size_t OtherRegionsTable::_fine_eviction_stride = 0; | |
| 259 size_t OtherRegionsTable::_fine_eviction_sample_size = 0; | |
| 260 | |
| 261 OtherRegionsTable::OtherRegionsTable(HeapRegion* hr) : | |
| 262 _g1h(G1CollectedHeap::heap()), | |
| 263 _m(Mutex::leaf, "An OtherRegionsTable lock", true), | |
| 264 _hr(hr), | |
| 265 _coarse_map(G1CollectedHeap::heap()->max_regions(), | |
| 266 false /* in-resource-area */), | |
| 267 _fine_grain_regions(NULL), | |
| 6253 | 268 _first_all_fine_prts(NULL), _last_all_fine_prts(NULL), |
| 342 | 269 _n_fine_entries(0), _n_coarse_entries(0), |
| 270 _fine_eviction_start(0), | |
| 271 _sparse_table(hr) | |
| 272 { | |
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273 typedef PerRegionTable* PerRegionTablePtr; |
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274 |
| 342 | 275 if (_max_fine_entries == 0) { |
| 276 assert(_mod_max_fine_entries_mask == 0, "Both or none."); | |
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277 size_t max_entries_log = (size_t)log2_long((jlong)G1RSetRegionEntries); |
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278 _max_fine_entries = (size_t)1 << max_entries_log; |
| 342 | 279 _mod_max_fine_entries_mask = _max_fine_entries - 1; |
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280 |
| 342 | 281 assert(_fine_eviction_sample_size == 0 |
| 282 && _fine_eviction_stride == 0, "All init at same time."); | |
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283 _fine_eviction_sample_size = MAX2((size_t)4, max_entries_log); |
| 342 | 284 _fine_eviction_stride = _max_fine_entries / _fine_eviction_sample_size; |
| 285 } | |
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286 |
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287 _fine_grain_regions = NEW_C_HEAP_ARRAY3(PerRegionTablePtr, _max_fine_entries, |
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288 mtGC, 0, AllocFailStrategy::RETURN_NULL); |
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289 |
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290 if (_fine_grain_regions == NULL) { |
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291 vm_exit_out_of_memory(sizeof(void*)*_max_fine_entries, OOM_MALLOC_ERROR, |
| 342 | 292 "Failed to allocate _fine_grain_entries."); |
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293 } |
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294 |
| 342 | 295 for (size_t i = 0; i < _max_fine_entries; i++) { |
| 296 _fine_grain_regions[i] = NULL; | |
| 297 } | |
| 298 } | |
| 299 | |
| 6253 | 300 void OtherRegionsTable::link_to_all(PerRegionTable* prt) { |
| 301 // We always append to the beginning of the list for convenience; | |
| 302 // the order of entries in this list does not matter. | |
| 303 if (_first_all_fine_prts != NULL) { | |
| 304 assert(_first_all_fine_prts->prev() == NULL, "invariant"); | |
| 305 _first_all_fine_prts->set_prev(prt); | |
| 306 prt->set_next(_first_all_fine_prts); | |
| 307 } else { | |
| 308 // this is the first element we insert. Adjust the "last" pointer | |
| 309 _last_all_fine_prts = prt; | |
| 310 assert(prt->next() == NULL, "just checking"); | |
| 311 } | |
| 312 // the new element is always the first element without a predecessor | |
| 313 prt->set_prev(NULL); | |
| 314 _first_all_fine_prts = prt; | |
| 315 | |
| 316 assert(prt->prev() == NULL, "just checking"); | |
| 317 assert(_first_all_fine_prts == prt, "just checking"); | |
| 318 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || | |
| 319 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), | |
| 320 "just checking"); | |
| 321 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, | |
| 322 "just checking"); | |
| 323 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, | |
| 324 "just checking"); | |
| 325 } | |
| 326 | |
| 327 void OtherRegionsTable::unlink_from_all(PerRegionTable* prt) { | |
| 328 if (prt->prev() != NULL) { | |
| 329 assert(_first_all_fine_prts != prt, "just checking"); | |
| 330 prt->prev()->set_next(prt->next()); | |
| 331 // removing the last element in the list? | |
| 332 if (_last_all_fine_prts == prt) { | |
| 333 _last_all_fine_prts = prt->prev(); | |
| 334 } | |
| 335 } else { | |
| 336 assert(_first_all_fine_prts == prt, "just checking"); | |
| 337 _first_all_fine_prts = prt->next(); | |
| 338 // list is empty now? | |
| 339 if (_first_all_fine_prts == NULL) { | |
| 340 _last_all_fine_prts = NULL; | |
| 341 } | |
| 342 } | |
| 343 | |
| 344 if (prt->next() != NULL) { | |
| 345 prt->next()->set_prev(prt->prev()); | |
| 346 } | |
| 347 | |
| 348 prt->set_next(NULL); | |
| 349 prt->set_prev(NULL); | |
| 350 | |
| 351 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || | |
| 352 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), | |
| 353 "just checking"); | |
| 354 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, | |
| 355 "just checking"); | |
| 356 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, | |
| 357 "just checking"); | |
| 358 } | |
| 359 | |
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360 int** OtherRegionsTable::_from_card_cache = NULL; |
| 342 | 361 size_t OtherRegionsTable::_from_card_cache_max_regions = 0; |
| 362 size_t OtherRegionsTable::_from_card_cache_mem_size = 0; | |
| 363 | |
| 364 void OtherRegionsTable::init_from_card_cache(size_t max_regions) { | |
| 365 _from_card_cache_max_regions = max_regions; | |
| 366 | |
| 367 int n_par_rs = HeapRegionRemSet::num_par_rem_sets(); | |
| 6197 | 368 _from_card_cache = NEW_C_HEAP_ARRAY(int*, n_par_rs, mtGC); |
| 342 | 369 for (int i = 0; i < n_par_rs; i++) { |
| 6197 | 370 _from_card_cache[i] = NEW_C_HEAP_ARRAY(int, max_regions, mtGC); |
| 342 | 371 for (size_t j = 0; j < max_regions; j++) { |
| 372 _from_card_cache[i][j] = -1; // An invalid value. | |
| 373 } | |
| 374 } | |
| 375 _from_card_cache_mem_size = n_par_rs * max_regions * sizeof(int); | |
| 376 } | |
| 377 | |
| 378 void OtherRegionsTable::shrink_from_card_cache(size_t new_n_regs) { | |
| 379 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
| 380 assert(new_n_regs <= _from_card_cache_max_regions, "Must be within max."); | |
| 381 for (size_t j = new_n_regs; j < _from_card_cache_max_regions; j++) { | |
| 382 _from_card_cache[i][j] = -1; // An invalid value. | |
| 383 } | |
| 384 } | |
| 385 } | |
| 386 | |
| 387 #ifndef PRODUCT | |
| 388 void OtherRegionsTable::print_from_card_cache() { | |
| 389 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
| 390 for (size_t j = 0; j < _from_card_cache_max_regions; j++) { | |
| 391 gclog_or_tty->print_cr("_from_card_cache[%d][%d] = %d.", | |
| 392 i, j, _from_card_cache[i][j]); | |
| 393 } | |
| 394 } | |
| 395 } | |
| 396 #endif | |
| 397 | |
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398 void OtherRegionsTable::add_reference(OopOrNarrowOopStar from, int tid) { |
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399 size_t cur_hrs_ind = (size_t) hr()->hrs_index(); |
| 342 | 400 |
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401 if (G1TraceHeapRegionRememberedSet) { |
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402 gclog_or_tty->print_cr("ORT::add_reference_work(" PTR_FORMAT "->" PTR_FORMAT ").", |
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403 from, |
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404 UseCompressedOops |
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405 ? oopDesc::load_decode_heap_oop((narrowOop*)from) |
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406 : oopDesc::load_decode_heap_oop((oop*)from)); |
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407 } |
| 342 | 408 |
| 409 int from_card = (int)(uintptr_t(from) >> CardTableModRefBS::card_shift); | |
| 410 | |
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411 if (G1TraceHeapRegionRememberedSet) { |
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412 gclog_or_tty->print_cr("Table for [" PTR_FORMAT "...): card %d (cache = %d)", |
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413 hr()->bottom(), from_card, |
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414 _from_card_cache[tid][cur_hrs_ind]); |
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415 } |
| 342 | 416 |
| 417 if (from_card == _from_card_cache[tid][cur_hrs_ind]) { | |
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418 if (G1TraceHeapRegionRememberedSet) { |
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419 gclog_or_tty->print_cr(" from-card cache hit."); |
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420 } |
| 342 | 421 assert(contains_reference(from), "We just added it!"); |
| 422 return; | |
| 423 } else { | |
| 424 _from_card_cache[tid][cur_hrs_ind] = from_card; | |
| 425 } | |
| 426 | |
| 427 // Note that this may be a continued H region. | |
| 428 HeapRegion* from_hr = _g1h->heap_region_containing_raw(from); | |
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429 RegionIdx_t from_hrs_ind = (RegionIdx_t) from_hr->hrs_index(); |
| 342 | 430 |
| 431 // If the region is already coarsened, return. | |
| 432 if (_coarse_map.at(from_hrs_ind)) { | |
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433 if (G1TraceHeapRegionRememberedSet) { |
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434 gclog_or_tty->print_cr(" coarse map hit."); |
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435 } |
| 342 | 436 assert(contains_reference(from), "We just added it!"); |
| 437 return; | |
| 438 } | |
| 439 | |
| 440 // Otherwise find a per-region table to add it to. | |
| 441 size_t ind = from_hrs_ind & _mod_max_fine_entries_mask; | |
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442 PerRegionTable* prt = find_region_table(ind, from_hr); |
| 342 | 443 if (prt == NULL) { |
| 444 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
| 445 // Confirm that it's really not there... | |
| 446 prt = find_region_table(ind, from_hr); | |
| 447 if (prt == NULL) { | |
| 448 | |
| 449 uintptr_t from_hr_bot_card_index = | |
| 450 uintptr_t(from_hr->bottom()) | |
| 451 >> CardTableModRefBS::card_shift; | |
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452 CardIdx_t card_index = from_card - from_hr_bot_card_index; |
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453 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
| 342 | 454 "Must be in range."); |
| 455 if (G1HRRSUseSparseTable && | |
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456 _sparse_table.add_card(from_hrs_ind, card_index)) { |
| 342 | 457 if (G1RecordHRRSOops) { |
| 458 HeapRegionRemSet::record(hr(), from); | |
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459 if (G1TraceHeapRegionRememberedSet) { |
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460 gclog_or_tty->print(" Added card " PTR_FORMAT " to region " |
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461 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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462 align_size_down(uintptr_t(from), |
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463 CardTableModRefBS::card_size), |
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464 hr()->bottom(), from); |
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465 } |
| 342 | 466 } |
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467 if (G1TraceHeapRegionRememberedSet) { |
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468 gclog_or_tty->print_cr(" added card to sparse table."); |
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469 } |
| 342 | 470 assert(contains_reference_locked(from), "We just added it!"); |
| 471 return; | |
| 472 } else { | |
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473 if (G1TraceHeapRegionRememberedSet) { |
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474 gclog_or_tty->print_cr(" [tid %d] sparse table entry " |
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475 "overflow(f: %d, t: %d)", |
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476 tid, from_hrs_ind, cur_hrs_ind); |
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477 } |
| 342 | 478 } |
| 479 | |
| 480 if (_n_fine_entries == _max_fine_entries) { | |
| 481 prt = delete_region_table(); | |
| 6253 | 482 // There is no need to clear the links to the 'all' list here: |
| 483 // prt will be reused immediately, i.e. remain in the 'all' list. | |
| 484 prt->init(from_hr, false /* clear_links_to_all_list */); | |
| 342 | 485 } else { |
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486 prt = PerRegionTable::alloc(from_hr); |
| 6253 | 487 link_to_all(prt); |
| 342 | 488 } |
| 489 | |
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490 PerRegionTable* first_prt = _fine_grain_regions[ind]; |
| 6253 | 491 prt->set_collision_list_next(first_prt); |
| 342 | 492 _fine_grain_regions[ind] = prt; |
| 493 _n_fine_entries++; | |
| 494 | |
| 495 if (G1HRRSUseSparseTable) { | |
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496 // Transfer from sparse to fine-grain. |
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497 SparsePRTEntry *sprt_entry = _sparse_table.get_entry(from_hrs_ind); |
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498 assert(sprt_entry != NULL, "There should have been an entry"); |
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499 for (int i = 0; i < SparsePRTEntry::cards_num(); i++) { |
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500 CardIdx_t c = sprt_entry->card(i); |
| 342 | 501 if (c != SparsePRTEntry::NullEntry) { |
| 502 prt->add_card(c); | |
| 503 } | |
| 504 } | |
| 505 // Now we can delete the sparse entry. | |
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506 bool res = _sparse_table.delete_entry(from_hrs_ind); |
| 342 | 507 assert(res, "It should have been there."); |
| 508 } | |
| 509 } | |
| 510 assert(prt != NULL && prt->hr() == from_hr, "consequence"); | |
| 511 } | |
| 512 // Note that we can't assert "prt->hr() == from_hr", because of the | |
| 513 // possibility of concurrent reuse. But see head comment of | |
| 514 // OtherRegionsTable for why this is OK. | |
| 515 assert(prt != NULL, "Inv"); | |
| 516 | |
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517 prt->add_reference(from); |
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518 |
| 342 | 519 if (G1RecordHRRSOops) { |
| 520 HeapRegionRemSet::record(hr(), from); | |
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521 if (G1TraceHeapRegionRememberedSet) { |
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522 gclog_or_tty->print("Added card " PTR_FORMAT " to region " |
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523 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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524 align_size_down(uintptr_t(from), |
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525 CardTableModRefBS::card_size), |
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526 hr()->bottom(), from); |
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527 } |
| 342 | 528 } |
| 529 assert(contains_reference(from), "We just added it!"); | |
| 530 } | |
| 531 | |
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532 PerRegionTable* |
| 342 | 533 OtherRegionsTable::find_region_table(size_t ind, HeapRegion* hr) const { |
| 534 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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535 PerRegionTable* prt = _fine_grain_regions[ind]; |
| 342 | 536 while (prt != NULL && prt->hr() != hr) { |
| 6253 | 537 prt = prt->collision_list_next(); |
| 342 | 538 } |
| 539 // Loop postcondition is the method postcondition. | |
| 540 return prt; | |
| 541 } | |
| 542 | |
| 543 jint OtherRegionsTable::_n_coarsenings = 0; | |
| 544 | |
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545 PerRegionTable* OtherRegionsTable::delete_region_table() { |
| 342 | 546 assert(_m.owned_by_self(), "Precondition"); |
| 547 assert(_n_fine_entries == _max_fine_entries, "Precondition"); | |
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548 PerRegionTable* max = NULL; |
| 342 | 549 jint max_occ = 0; |
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550 PerRegionTable** max_prev; |
| 342 | 551 size_t max_ind; |
| 552 | |
| 553 size_t i = _fine_eviction_start; | |
| 554 for (size_t k = 0; k < _fine_eviction_sample_size; k++) { | |
| 555 size_t ii = i; | |
| 556 // Make sure we get a non-NULL sample. | |
| 557 while (_fine_grain_regions[ii] == NULL) { | |
| 558 ii++; | |
| 559 if (ii == _max_fine_entries) ii = 0; | |
| 560 guarantee(ii != i, "We must find one."); | |
| 561 } | |
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562 PerRegionTable** prev = &_fine_grain_regions[ii]; |
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563 PerRegionTable* cur = *prev; |
| 342 | 564 while (cur != NULL) { |
| 565 jint cur_occ = cur->occupied(); | |
| 566 if (max == NULL || cur_occ > max_occ) { | |
| 567 max = cur; | |
| 568 max_prev = prev; | |
| 569 max_ind = i; | |
| 570 max_occ = cur_occ; | |
| 571 } | |
| 6253 | 572 prev = cur->collision_list_next_addr(); |
| 573 cur = cur->collision_list_next(); | |
| 342 | 574 } |
| 575 i = i + _fine_eviction_stride; | |
| 576 if (i >= _n_fine_entries) i = i - _n_fine_entries; | |
| 577 } | |
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578 |
| 342 | 579 _fine_eviction_start++; |
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580 |
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581 if (_fine_eviction_start >= _n_fine_entries) { |
| 342 | 582 _fine_eviction_start -= _n_fine_entries; |
| 583 } | |
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584 |
| 342 | 585 guarantee(max != NULL, "Since _n_fine_entries > 0"); |
| 586 | |
| 587 // Set the corresponding coarse bit. | |
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588 size_t max_hrs_index = (size_t) max->hr()->hrs_index(); |
| 342 | 589 if (!_coarse_map.at(max_hrs_index)) { |
| 590 _coarse_map.at_put(max_hrs_index, true); | |
| 591 _n_coarse_entries++; | |
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592 if (G1TraceHeapRegionRememberedSet) { |
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593 gclog_or_tty->print("Coarsened entry in region [" PTR_FORMAT "...] " |
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594 "for region [" PTR_FORMAT "...] (%d coarse entries).\n", |
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595 hr()->bottom(), |
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596 max->hr()->bottom(), |
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597 _n_coarse_entries); |
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598 } |
| 342 | 599 } |
| 600 | |
| 601 // Unsplice. | |
| 6253 | 602 *max_prev = max->collision_list_next(); |
| 342 | 603 Atomic::inc(&_n_coarsenings); |
| 604 _n_fine_entries--; | |
| 605 return max; | |
| 606 } | |
| 607 | |
| 608 | |
| 609 // At present, this must be called stop-world single-threaded. | |
| 610 void OtherRegionsTable::scrub(CardTableModRefBS* ctbs, | |
| 611 BitMap* region_bm, BitMap* card_bm) { | |
| 612 // First eliminated garbage regions from the coarse map. | |
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613 if (G1RSScrubVerbose) { |
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614 gclog_or_tty->print_cr("Scrubbing region %u:", hr()->hrs_index()); |
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615 } |
| 342 | 616 |
| 617 assert(_coarse_map.size() == region_bm->size(), "Precondition"); | |
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618 if (G1RSScrubVerbose) { |
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619 gclog_or_tty->print(" Coarse map: before = "SIZE_FORMAT"...", |
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620 _n_coarse_entries); |
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621 } |
| 342 | 622 _coarse_map.set_intersection(*region_bm); |
| 623 _n_coarse_entries = _coarse_map.count_one_bits(); | |
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624 if (G1RSScrubVerbose) { |
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625 gclog_or_tty->print_cr(" after = "SIZE_FORMAT".", _n_coarse_entries); |
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626 } |
| 342 | 627 |
| 628 // Now do the fine-grained maps. | |
| 629 for (size_t i = 0; i < _max_fine_entries; i++) { | |
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630 PerRegionTable* cur = _fine_grain_regions[i]; |
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631 PerRegionTable** prev = &_fine_grain_regions[i]; |
| 342 | 632 while (cur != NULL) { |
| 6253 | 633 PerRegionTable* nxt = cur->collision_list_next(); |
| 342 | 634 // If the entire region is dead, eliminate. |
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635 if (G1RSScrubVerbose) { |
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636 gclog_or_tty->print_cr(" For other region %u:", |
| 3766 | 637 cur->hr()->hrs_index()); |
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638 } |
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639 if (!region_bm->at((size_t) cur->hr()->hrs_index())) { |
| 342 | 640 *prev = nxt; |
| 6253 | 641 cur->set_collision_list_next(NULL); |
| 342 | 642 _n_fine_entries--; |
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643 if (G1RSScrubVerbose) { |
| 342 | 644 gclog_or_tty->print_cr(" deleted via region map."); |
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645 } |
| 6253 | 646 unlink_from_all(cur); |
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647 PerRegionTable::free(cur); |
| 342 | 648 } else { |
| 649 // Do fine-grain elimination. | |
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650 if (G1RSScrubVerbose) { |
| 342 | 651 gclog_or_tty->print(" occ: before = %4d.", cur->occupied()); |
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652 } |
| 342 | 653 cur->scrub(ctbs, card_bm); |
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654 if (G1RSScrubVerbose) { |
| 342 | 655 gclog_or_tty->print_cr(" after = %4d.", cur->occupied()); |
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656 } |
| 342 | 657 // Did that empty the table completely? |
| 658 if (cur->occupied() == 0) { | |
| 659 *prev = nxt; | |
| 6253 | 660 cur->set_collision_list_next(NULL); |
| 342 | 661 _n_fine_entries--; |
| 6253 | 662 unlink_from_all(cur); |
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663 PerRegionTable::free(cur); |
| 342 | 664 } else { |
| 6253 | 665 prev = cur->collision_list_next_addr(); |
| 342 | 666 } |
| 667 } | |
| 668 cur = nxt; | |
| 669 } | |
| 670 } | |
| 671 // Since we may have deleted a from_card_cache entry from the RS, clear | |
| 672 // the FCC. | |
| 673 clear_fcc(); | |
| 674 } | |
| 675 | |
| 676 | |
| 677 size_t OtherRegionsTable::occupied() const { | |
| 678 // Cast away const in this case. | |
| 679 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
| 680 size_t sum = occ_fine(); | |
| 681 sum += occ_sparse(); | |
| 682 sum += occ_coarse(); | |
| 683 return sum; | |
| 684 } | |
| 685 | |
| 686 size_t OtherRegionsTable::occ_fine() const { | |
| 687 size_t sum = 0; | |
| 6253 | 688 |
| 689 size_t num = 0; | |
| 690 PerRegionTable * cur = _first_all_fine_prts; | |
| 691 while (cur != NULL) { | |
| 692 sum += cur->occupied(); | |
| 693 cur = cur->next(); | |
| 694 num++; | |
| 342 | 695 } |
| 6253 | 696 guarantee(num == _n_fine_entries, "just checking"); |
| 342 | 697 return sum; |
| 698 } | |
| 699 | |
| 700 size_t OtherRegionsTable::occ_coarse() const { | |
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701 return (_n_coarse_entries * HeapRegion::CardsPerRegion); |
| 342 | 702 } |
| 703 | |
| 704 size_t OtherRegionsTable::occ_sparse() const { | |
| 705 return _sparse_table.occupied(); | |
| 706 } | |
| 707 | |
| 708 size_t OtherRegionsTable::mem_size() const { | |
| 709 // Cast away const in this case. | |
| 710 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
| 711 size_t sum = 0; | |
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712 // all PRTs are of the same size so it is sufficient to query only one of them. |
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713 if (_first_all_fine_prts != NULL) { |
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714 assert(_last_all_fine_prts != NULL && |
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715 _first_all_fine_prts->mem_size() == _last_all_fine_prts->mem_size(), "check that mem_size() is constant"); |
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716 sum += _first_all_fine_prts->mem_size() * _n_fine_entries; |
| 342 | 717 } |
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718 sum += (sizeof(PerRegionTable*) * _max_fine_entries); |
| 342 | 719 sum += (_coarse_map.size_in_words() * HeapWordSize); |
| 720 sum += (_sparse_table.mem_size()); | |
| 721 sum += sizeof(*this) - sizeof(_sparse_table); // Avoid double counting above. | |
| 722 return sum; | |
| 723 } | |
| 724 | |
| 725 size_t OtherRegionsTable::static_mem_size() { | |
| 726 return _from_card_cache_mem_size; | |
| 727 } | |
| 728 | |
| 729 size_t OtherRegionsTable::fl_mem_size() { | |
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730 return PerRegionTable::fl_mem_size(); |
| 342 | 731 } |
| 732 | |
| 733 void OtherRegionsTable::clear_fcc() { | |
| 6253 | 734 size_t hrs_idx = hr()->hrs_index(); |
| 342 | 735 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { |
| 6253 | 736 _from_card_cache[i][hrs_idx] = -1; |
| 342 | 737 } |
| 738 } | |
| 739 | |
| 740 void OtherRegionsTable::clear() { | |
| 741 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
| 6253 | 742 // if there are no entries, skip this step |
| 743 if (_first_all_fine_prts != NULL) { | |
| 744 guarantee(_first_all_fine_prts != NULL && _last_all_fine_prts != NULL, "just checking"); | |
| 745 PerRegionTable::bulk_free(_first_all_fine_prts, _last_all_fine_prts); | |
| 746 memset(_fine_grain_regions, 0, _max_fine_entries * sizeof(_fine_grain_regions[0])); | |
| 747 } else { | |
| 748 guarantee(_first_all_fine_prts == NULL && _last_all_fine_prts == NULL, "just checking"); | |
| 342 | 749 } |
| 6253 | 750 |
| 751 _first_all_fine_prts = _last_all_fine_prts = NULL; | |
| 342 | 752 _sparse_table.clear(); |
| 753 _coarse_map.clear(); | |
| 754 _n_fine_entries = 0; | |
| 755 _n_coarse_entries = 0; | |
| 756 | |
| 757 clear_fcc(); | |
| 758 } | |
| 759 | |
| 760 void OtherRegionsTable::clear_incoming_entry(HeapRegion* from_hr) { | |
| 761 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
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762 size_t hrs_ind = (size_t) from_hr->hrs_index(); |
| 342 | 763 size_t ind = hrs_ind & _mod_max_fine_entries_mask; |
| 764 if (del_single_region_table(ind, from_hr)) { | |
| 765 assert(!_coarse_map.at(hrs_ind), "Inv"); | |
| 766 } else { | |
| 767 _coarse_map.par_at_put(hrs_ind, 0); | |
| 768 } | |
| 769 // Check to see if any of the fcc entries come from here. | |
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770 size_t hr_ind = (size_t) hr()->hrs_index(); |
| 342 | 771 for (int tid = 0; tid < HeapRegionRemSet::num_par_rem_sets(); tid++) { |
| 772 int fcc_ent = _from_card_cache[tid][hr_ind]; | |
| 773 if (fcc_ent != -1) { | |
| 774 HeapWord* card_addr = (HeapWord*) | |
| 775 (uintptr_t(fcc_ent) << CardTableModRefBS::card_shift); | |
| 776 if (hr()->is_in_reserved(card_addr)) { | |
| 777 // Clear the from card cache. | |
| 778 _from_card_cache[tid][hr_ind] = -1; | |
| 779 } | |
| 780 } | |
| 781 } | |
| 782 } | |
| 783 | |
| 784 bool OtherRegionsTable::del_single_region_table(size_t ind, | |
| 785 HeapRegion* hr) { | |
| 786 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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787 PerRegionTable** prev_addr = &_fine_grain_regions[ind]; |
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788 PerRegionTable* prt = *prev_addr; |
| 342 | 789 while (prt != NULL && prt->hr() != hr) { |
| 6253 | 790 prev_addr = prt->collision_list_next_addr(); |
| 791 prt = prt->collision_list_next(); | |
| 342 | 792 } |
| 793 if (prt != NULL) { | |
| 794 assert(prt->hr() == hr, "Loop postcondition."); | |
| 6253 | 795 *prev_addr = prt->collision_list_next(); |
| 796 unlink_from_all(prt); | |
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797 PerRegionTable::free(prt); |
| 342 | 798 _n_fine_entries--; |
| 799 return true; | |
| 800 } else { | |
| 801 return false; | |
| 802 } | |
| 803 } | |
| 804 | |
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805 bool OtherRegionsTable::contains_reference(OopOrNarrowOopStar from) const { |
| 342 | 806 // Cast away const in this case. |
| 807 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
| 808 return contains_reference_locked(from); | |
| 809 } | |
| 810 | |
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811 bool OtherRegionsTable::contains_reference_locked(OopOrNarrowOopStar from) const { |
| 342 | 812 HeapRegion* hr = _g1h->heap_region_containing_raw(from); |
| 813 if (hr == NULL) return false; | |
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814 RegionIdx_t hr_ind = (RegionIdx_t) hr->hrs_index(); |
| 342 | 815 // Is this region in the coarse map? |
| 816 if (_coarse_map.at(hr_ind)) return true; | |
| 817 | |
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818 PerRegionTable* prt = find_region_table(hr_ind & _mod_max_fine_entries_mask, |
| 342 | 819 hr); |
| 820 if (prt != NULL) { | |
| 821 return prt->contains_reference(from); | |
| 822 | |
| 823 } else { | |
| 824 uintptr_t from_card = | |
| 825 (uintptr_t(from) >> CardTableModRefBS::card_shift); | |
| 826 uintptr_t hr_bot_card_index = | |
| 827 uintptr_t(hr->bottom()) >> CardTableModRefBS::card_shift; | |
| 828 assert(from_card >= hr_bot_card_index, "Inv"); | |
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829 CardIdx_t card_index = from_card - hr_bot_card_index; |
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830 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
|
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831 "Must be in range."); |
|
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832 return _sparse_table.contains_card(hr_ind, card_index); |
| 342 | 833 } |
| 834 | |
| 835 | |
| 836 } | |
| 837 | |
| 2173 | 838 void |
| 839 OtherRegionsTable::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
| 840 _sparse_table.do_cleanup_work(hrrs_cleanup_task); | |
| 841 } | |
| 842 | |
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843 // Determines how many threads can add records to an rset in parallel. |
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844 // This can be done by either mutator threads together with the |
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845 // concurrent refinement threads or GC threads. |
| 342 | 846 int HeapRegionRemSet::num_par_rem_sets() { |
|
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847 return (int)MAX2(DirtyCardQueueSet::num_par_ids() + ConcurrentG1Refine::thread_num(), ParallelGCThreads); |
| 342 | 848 } |
| 849 | |
| 850 HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, | |
| 851 HeapRegion* hr) | |
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852 : _bosa(bosa), _other_regions(hr) { |
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853 reset_for_par_iteration(); |
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854 } |
| 342 | 855 |
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856 void HeapRegionRemSet::setup_remset_size() { |
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857 // Setup sparse and fine-grain tables sizes. |
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858 // table_size = base * (log(region_size / 1M) + 1) |
|
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859 const int LOG_M = 20; |
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860 int region_size_log_mb = MAX2(HeapRegion::LogOfHRGrainBytes - LOG_M, 0); |
|
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861 if (FLAG_IS_DEFAULT(G1RSetSparseRegionEntries)) { |
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862 G1RSetSparseRegionEntries = G1RSetSparseRegionEntriesBase * (region_size_log_mb + 1); |
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863 } |
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864 if (FLAG_IS_DEFAULT(G1RSetRegionEntries)) { |
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865 G1RSetRegionEntries = G1RSetRegionEntriesBase * (region_size_log_mb + 1); |
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866 } |
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867 guarantee(G1RSetSparseRegionEntries > 0 && G1RSetRegionEntries > 0 , "Sanity"); |
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868 } |
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869 |
| 342 | 870 bool HeapRegionRemSet::claim_iter() { |
| 871 if (_iter_state != Unclaimed) return false; | |
| 872 jint res = Atomic::cmpxchg(Claimed, (jint*)(&_iter_state), Unclaimed); | |
| 873 return (res == Unclaimed); | |
| 874 } | |
| 875 | |
| 876 void HeapRegionRemSet::set_iter_complete() { | |
| 877 _iter_state = Complete; | |
| 878 } | |
| 879 | |
| 880 bool HeapRegionRemSet::iter_is_complete() { | |
| 881 return _iter_state == Complete; | |
| 882 } | |
| 883 | |
| 884 #ifndef PRODUCT | |
| 885 void HeapRegionRemSet::print() const { | |
|
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886 HeapRegionRemSetIterator iter(this); |
| 342 | 887 size_t card_index; |
| 888 while (iter.has_next(card_index)) { | |
| 889 HeapWord* card_start = | |
| 890 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
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891 gclog_or_tty->print_cr(" Card " PTR_FORMAT, card_start); |
| 342 | 892 } |
| 893 if (iter.n_yielded() != occupied()) { | |
| 894 gclog_or_tty->print_cr("Yielded disagrees with occupied:"); | |
| 895 gclog_or_tty->print_cr(" %6d yielded (%6d coarse, %6d fine).", | |
| 896 iter.n_yielded(), | |
| 897 iter.n_yielded_coarse(), iter.n_yielded_fine()); | |
| 898 gclog_or_tty->print_cr(" %6d occ (%6d coarse, %6d fine).", | |
| 899 occupied(), occ_coarse(), occ_fine()); | |
| 900 } | |
| 901 guarantee(iter.n_yielded() == occupied(), | |
| 902 "We should have yielded all the represented cards."); | |
| 903 } | |
| 904 #endif | |
| 905 | |
| 906 void HeapRegionRemSet::cleanup() { | |
| 907 SparsePRT::cleanup_all(); | |
| 908 } | |
| 909 | |
| 910 void HeapRegionRemSet::clear() { | |
| 911 _other_regions.clear(); | |
| 912 assert(occupied() == 0, "Should be clear."); | |
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913 reset_for_par_iteration(); |
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914 } |
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915 |
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916 void HeapRegionRemSet::reset_for_par_iteration() { |
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917 _iter_state = Unclaimed; |
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918 _iter_claimed = 0; |
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919 // It's good to check this to make sure that the two methods are in sync. |
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920 assert(verify_ready_for_par_iteration(), "post-condition"); |
| 342 | 921 } |
| 922 | |
| 923 void HeapRegionRemSet::scrub(CardTableModRefBS* ctbs, | |
| 924 BitMap* region_bm, BitMap* card_bm) { | |
| 925 _other_regions.scrub(ctbs, region_bm, card_bm); | |
| 926 } | |
| 927 | |
| 928 //-------------------- Iteration -------------------- | |
| 929 | |
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930 HeapRegionRemSetIterator:: HeapRegionRemSetIterator(const HeapRegionRemSet* hrrs) : |
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931 _hrrs(hrrs), |
| 342 | 932 _g1h(G1CollectedHeap::heap()), |
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933 _coarse_map(&hrrs->_other_regions._coarse_map), |
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934 _fine_grain_regions(hrrs->_other_regions._fine_grain_regions), |
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935 _bosa(hrrs->bosa()), |
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936 _is(Sparse), |
| 342 | 937 // Set these values so that we increment to the first region. |
|
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938 _coarse_cur_region_index(-1), |
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939 _coarse_cur_region_cur_card(HeapRegion::CardsPerRegion-1), |
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940 _cur_region_cur_card(0), |
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941 _fine_array_index(-1), |
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942 _fine_cur_prt(NULL), |
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943 _n_yielded_coarse(0), |
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944 _n_yielded_fine(0), |
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945 _n_yielded_sparse(0), |
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946 _sparse_iter(&hrrs->_other_regions._sparse_table) {} |
| 342 | 947 |
| 948 bool HeapRegionRemSetIterator::coarse_has_next(size_t& card_index) { | |
| 949 if (_hrrs->_other_regions._n_coarse_entries == 0) return false; | |
| 950 // Go to the next card. | |
| 951 _coarse_cur_region_cur_card++; | |
| 952 // Was the last the last card in the current region? | |
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953 if (_coarse_cur_region_cur_card == HeapRegion::CardsPerRegion) { |
| 342 | 954 // Yes: find the next region. This may leave _coarse_cur_region_index |
| 955 // Set to the last index, in which case there are no more coarse | |
| 956 // regions. | |
| 957 _coarse_cur_region_index = | |
| 958 (int) _coarse_map->get_next_one_offset(_coarse_cur_region_index + 1); | |
| 959 if ((size_t)_coarse_cur_region_index < _coarse_map->size()) { | |
| 960 _coarse_cur_region_cur_card = 0; | |
| 961 HeapWord* r_bot = | |
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962 _g1h->region_at((uint) _coarse_cur_region_index)->bottom(); |
| 342 | 963 _cur_region_card_offset = _bosa->index_for(r_bot); |
| 964 } else { | |
| 965 return false; | |
| 966 } | |
| 967 } | |
| 968 // If we didn't return false above, then we can yield a card. | |
| 969 card_index = _cur_region_card_offset + _coarse_cur_region_cur_card; | |
| 970 return true; | |
| 971 } | |
| 972 | |
| 973 void HeapRegionRemSetIterator::fine_find_next_non_null_prt() { | |
| 974 // Otherwise, find the next bucket list in the array. | |
| 975 _fine_array_index++; | |
| 976 while (_fine_array_index < (int) OtherRegionsTable::_max_fine_entries) { | |
| 977 _fine_cur_prt = _fine_grain_regions[_fine_array_index]; | |
| 978 if (_fine_cur_prt != NULL) return; | |
| 979 else _fine_array_index++; | |
| 980 } | |
| 981 assert(_fine_cur_prt == NULL, "Loop post"); | |
| 982 } | |
| 983 | |
| 984 bool HeapRegionRemSetIterator::fine_has_next(size_t& card_index) { | |
| 985 if (fine_has_next()) { | |
| 986 _cur_region_cur_card = | |
| 987 _fine_cur_prt->_bm.get_next_one_offset(_cur_region_cur_card + 1); | |
| 988 } | |
| 989 while (!fine_has_next()) { | |
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990 if (_cur_region_cur_card == (size_t) HeapRegion::CardsPerRegion) { |
| 342 | 991 _cur_region_cur_card = 0; |
| 6253 | 992 _fine_cur_prt = _fine_cur_prt->collision_list_next(); |
| 342 | 993 } |
| 994 if (_fine_cur_prt == NULL) { | |
| 995 fine_find_next_non_null_prt(); | |
| 996 if (_fine_cur_prt == NULL) return false; | |
| 997 } | |
| 998 assert(_fine_cur_prt != NULL && _cur_region_cur_card == 0, | |
| 999 "inv."); | |
| 1000 HeapWord* r_bot = | |
| 1001 _fine_cur_prt->hr()->bottom(); | |
| 1002 _cur_region_card_offset = _bosa->index_for(r_bot); | |
| 1003 _cur_region_cur_card = _fine_cur_prt->_bm.get_next_one_offset(0); | |
| 1004 } | |
| 1005 assert(fine_has_next(), "Or else we exited the loop via the return."); | |
| 1006 card_index = _cur_region_card_offset + _cur_region_cur_card; | |
| 1007 return true; | |
| 1008 } | |
| 1009 | |
| 1010 bool HeapRegionRemSetIterator::fine_has_next() { | |
| 1011 return | |
| 1012 _fine_cur_prt != NULL && | |
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1013 _cur_region_cur_card < HeapRegion::CardsPerRegion; |
| 342 | 1014 } |
| 1015 | |
| 1016 bool HeapRegionRemSetIterator::has_next(size_t& card_index) { | |
| 1017 switch (_is) { | |
| 1018 case Sparse: | |
| 1019 if (_sparse_iter.has_next(card_index)) { | |
| 1020 _n_yielded_sparse++; | |
| 1021 return true; | |
| 1022 } | |
| 1023 // Otherwise, deliberate fall-through | |
| 1024 _is = Fine; | |
| 1025 case Fine: | |
| 1026 if (fine_has_next(card_index)) { | |
| 1027 _n_yielded_fine++; | |
| 1028 return true; | |
| 1029 } | |
| 1030 // Otherwise, deliberate fall-through | |
| 1031 _is = Coarse; | |
| 1032 case Coarse: | |
| 1033 if (coarse_has_next(card_index)) { | |
| 1034 _n_yielded_coarse++; | |
| 1035 return true; | |
| 1036 } | |
| 1037 // Otherwise... | |
| 1038 break; | |
| 1039 } | |
| 1040 assert(ParallelGCThreads > 1 || | |
| 1041 n_yielded() == _hrrs->occupied(), | |
| 1042 "Should have yielded all the cards in the rem set " | |
| 1043 "(in the non-par case)."); | |
| 1044 return false; | |
| 1045 } | |
| 1046 | |
| 1047 | |
| 1048 | |
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1049 OopOrNarrowOopStar* HeapRegionRemSet::_recorded_oops = NULL; |
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1050 HeapWord** HeapRegionRemSet::_recorded_cards = NULL; |
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1051 HeapRegion** HeapRegionRemSet::_recorded_regions = NULL; |
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1052 int HeapRegionRemSet::_n_recorded = 0; |
| 342 | 1053 |
| 1054 HeapRegionRemSet::Event* HeapRegionRemSet::_recorded_events = NULL; | |
| 1055 int* HeapRegionRemSet::_recorded_event_index = NULL; | |
| 1056 int HeapRegionRemSet::_n_recorded_events = 0; | |
| 1057 | |
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1058 void HeapRegionRemSet::record(HeapRegion* hr, OopOrNarrowOopStar f) { |
| 342 | 1059 if (_recorded_oops == NULL) { |
| 1060 assert(_n_recorded == 0 | |
| 1061 && _recorded_cards == NULL | |
| 1062 && _recorded_regions == NULL, | |
| 1063 "Inv"); | |
| 6197 | 1064 _recorded_oops = NEW_C_HEAP_ARRAY(OopOrNarrowOopStar, MaxRecorded, mtGC); |
| 1065 _recorded_cards = NEW_C_HEAP_ARRAY(HeapWord*, MaxRecorded, mtGC); | |
| 1066 _recorded_regions = NEW_C_HEAP_ARRAY(HeapRegion*, MaxRecorded, mtGC); | |
| 342 | 1067 } |
| 1068 if (_n_recorded == MaxRecorded) { | |
| 1069 gclog_or_tty->print_cr("Filled up 'recorded' (%d).", MaxRecorded); | |
| 1070 } else { | |
| 1071 _recorded_cards[_n_recorded] = | |
| 1072 (HeapWord*)align_size_down(uintptr_t(f), | |
| 1073 CardTableModRefBS::card_size); | |
| 1074 _recorded_oops[_n_recorded] = f; | |
| 1075 _recorded_regions[_n_recorded] = hr; | |
| 1076 _n_recorded++; | |
| 1077 } | |
| 1078 } | |
| 1079 | |
| 1080 void HeapRegionRemSet::record_event(Event evnt) { | |
| 1081 if (!G1RecordHRRSEvents) return; | |
| 1082 | |
| 1083 if (_recorded_events == NULL) { | |
| 1084 assert(_n_recorded_events == 0 | |
| 1085 && _recorded_event_index == NULL, | |
| 1086 "Inv"); | |
| 6197 | 1087 _recorded_events = NEW_C_HEAP_ARRAY(Event, MaxRecordedEvents, mtGC); |
| 1088 _recorded_event_index = NEW_C_HEAP_ARRAY(int, MaxRecordedEvents, mtGC); | |
| 342 | 1089 } |
| 1090 if (_n_recorded_events == MaxRecordedEvents) { | |
| 1091 gclog_or_tty->print_cr("Filled up 'recorded_events' (%d).", MaxRecordedEvents); | |
| 1092 } else { | |
| 1093 _recorded_events[_n_recorded_events] = evnt; | |
| 1094 _recorded_event_index[_n_recorded_events] = _n_recorded; | |
| 1095 _n_recorded_events++; | |
| 1096 } | |
| 1097 } | |
| 1098 | |
| 1099 void HeapRegionRemSet::print_event(outputStream* str, Event evnt) { | |
| 1100 switch (evnt) { | |
| 1101 case Event_EvacStart: | |
| 1102 str->print("Evac Start"); | |
| 1103 break; | |
| 1104 case Event_EvacEnd: | |
| 1105 str->print("Evac End"); | |
| 1106 break; | |
| 1107 case Event_RSUpdateEnd: | |
| 1108 str->print("RS Update End"); | |
| 1109 break; | |
| 1110 } | |
| 1111 } | |
| 1112 | |
| 1113 void HeapRegionRemSet::print_recorded() { | |
| 1114 int cur_evnt = 0; | |
| 1115 Event cur_evnt_kind; | |
| 1116 int cur_evnt_ind = 0; | |
| 1117 if (_n_recorded_events > 0) { | |
| 1118 cur_evnt_kind = _recorded_events[cur_evnt]; | |
| 1119 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
| 1120 } | |
| 1121 | |
| 1122 for (int i = 0; i < _n_recorded; i++) { | |
| 1123 while (cur_evnt < _n_recorded_events && i == cur_evnt_ind) { | |
| 1124 gclog_or_tty->print("Event: "); | |
| 1125 print_event(gclog_or_tty, cur_evnt_kind); | |
| 1126 gclog_or_tty->print_cr(""); | |
| 1127 cur_evnt++; | |
| 1128 if (cur_evnt < MaxRecordedEvents) { | |
| 1129 cur_evnt_kind = _recorded_events[cur_evnt]; | |
| 1130 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
| 1131 } | |
| 1132 } | |
| 1133 gclog_or_tty->print("Added card " PTR_FORMAT " to region [" PTR_FORMAT "...]" | |
| 1134 " for ref " PTR_FORMAT ".\n", | |
| 1135 _recorded_cards[i], _recorded_regions[i]->bottom(), | |
| 1136 _recorded_oops[i]); | |
| 1137 } | |
| 1138 } | |
| 1139 | |
| 2173 | 1140 void HeapRegionRemSet::reset_for_cleanup_tasks() { |
| 1141 SparsePRT::reset_for_cleanup_tasks(); | |
| 1142 } | |
| 1143 | |
| 1144 void HeapRegionRemSet::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
| 1145 _other_regions.do_cleanup_work(hrrs_cleanup_task); | |
| 1146 } | |
| 1147 | |
| 1148 void | |
| 1149 HeapRegionRemSet::finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task) { | |
| 1150 SparsePRT::finish_cleanup_task(hrrs_cleanup_task); | |
| 1151 } | |
| 1152 | |
| 342 | 1153 #ifndef PRODUCT |
|
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1154 void PerRegionTable::test_fl_mem_size() { |
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1155 PerRegionTable* dummy = alloc(NULL); |
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1156 free(dummy); |
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1157 guarantee(dummy->mem_size() == fl_mem_size(), "fl_mem_size() does not return the correct element size"); |
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1158 // try to reset the state |
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1159 _free_list = NULL; |
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1160 delete dummy; |
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1161 } |
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1162 |
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1163 void HeapRegionRemSet::test_prt() { |
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1164 PerRegionTable::test_fl_mem_size(); |
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1165 } |
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1166 |
| 342 | 1167 void HeapRegionRemSet::test() { |
| 1168 os::sleep(Thread::current(), (jlong)5000, false); | |
| 1169 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1170 | |
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1171 // Run with "-XX:G1LogRSetRegionEntries=2", so that 1 and 5 end up in same |
| 342 | 1172 // hash bucket. |
| 1173 HeapRegion* hr0 = g1h->region_at(0); | |
| 1174 HeapRegion* hr1 = g1h->region_at(1); | |
| 1175 HeapRegion* hr2 = g1h->region_at(5); | |
| 1176 HeapRegion* hr3 = g1h->region_at(6); | |
| 1177 HeapRegion* hr4 = g1h->region_at(7); | |
| 1178 HeapRegion* hr5 = g1h->region_at(8); | |
| 1179 | |
| 1180 HeapWord* hr1_start = hr1->bottom(); | |
| 1181 HeapWord* hr1_mid = hr1_start + HeapRegion::GrainWords/2; | |
| 1182 HeapWord* hr1_last = hr1->end() - 1; | |
| 1183 | |
| 1184 HeapWord* hr2_start = hr2->bottom(); | |
| 1185 HeapWord* hr2_mid = hr2_start + HeapRegion::GrainWords/2; | |
| 1186 HeapWord* hr2_last = hr2->end() - 1; | |
| 1187 | |
| 1188 HeapWord* hr3_start = hr3->bottom(); | |
| 1189 HeapWord* hr3_mid = hr3_start + HeapRegion::GrainWords/2; | |
| 1190 HeapWord* hr3_last = hr3->end() - 1; | |
| 1191 | |
| 1192 HeapRegionRemSet* hrrs = hr0->rem_set(); | |
| 1193 | |
| 1194 // Make three references from region 0x101... | |
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1195 hrrs->add_reference((OopOrNarrowOopStar)hr1_start); |
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1196 hrrs->add_reference((OopOrNarrowOopStar)hr1_mid); |
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1197 hrrs->add_reference((OopOrNarrowOopStar)hr1_last); |
| 342 | 1198 |
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1199 hrrs->add_reference((OopOrNarrowOopStar)hr2_start); |
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1200 hrrs->add_reference((OopOrNarrowOopStar)hr2_mid); |
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1201 hrrs->add_reference((OopOrNarrowOopStar)hr2_last); |
| 342 | 1202 |
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1203 hrrs->add_reference((OopOrNarrowOopStar)hr3_start); |
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1204 hrrs->add_reference((OopOrNarrowOopStar)hr3_mid); |
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1205 hrrs->add_reference((OopOrNarrowOopStar)hr3_last); |
| 342 | 1206 |
| 1207 // Now cause a coarsening. | |
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1208 hrrs->add_reference((OopOrNarrowOopStar)hr4->bottom()); |
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1209 hrrs->add_reference((OopOrNarrowOopStar)hr5->bottom()); |
| 342 | 1210 |
| 1211 // Now, does iteration yield these three? | |
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1212 HeapRegionRemSetIterator iter(hrrs); |
| 342 | 1213 size_t sum = 0; |
| 1214 size_t card_index; | |
| 1215 while (iter.has_next(card_index)) { | |
| 1216 HeapWord* card_start = | |
| 1217 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
| 1218 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); | |
| 1219 sum++; | |
| 1220 } | |
| 1221 guarantee(sum == 11 - 3 + 2048, "Failure"); | |
| 1222 guarantee(sum == hrrs->occupied(), "Failure"); | |
| 1223 } | |
| 1224 #endif |