Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp @ 13062:28674af341ac
8027756: assert(!hr->isHumongous()) failed: code root in humongous region?
Summary: Change checks for isHumongous() to continuesHumongous() as installing a code root for a humongous object is valid, but not for continuations of humongous objects. Cleaned up asserts.
Reviewed-by: jmasa, tamao
| author | tschatzl |
|---|---|
| date | Thu, 07 Nov 2013 15:17:10 +0100 |
| parents | 190899198332 |
| children | 191174b49bec |
| 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" | |
| 12080 | 36 #include "utilities/growableArray.hpp" |
| 342 | 37 |
| 6197 | 38 class PerRegionTable: public CHeapObj<mtGC> { |
| 342 | 39 friend class OtherRegionsTable; |
| 40 friend class HeapRegionRemSetIterator; | |
| 41 | |
| 42 HeapRegion* _hr; | |
| 43 BitMap _bm; | |
| 44 jint _occupied; | |
| 45 | |
| 6253 | 46 // next pointer for free/allocated 'all' list |
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47 PerRegionTable* _next; |
| 342 | 48 |
| 6253 | 49 // prev pointer for the allocated 'all' list |
| 50 PerRegionTable* _prev; | |
| 342 | 51 |
| 6253 | 52 // next pointer in collision list |
| 53 PerRegionTable * _collision_list_next; | |
| 342 | 54 |
| 6253 | 55 // Global free list of PRTs |
| 56 static PerRegionTable* _free_list; | |
| 342 | 57 |
| 58 protected: | |
| 59 // We need access in order to union things into the base table. | |
| 60 BitMap* bm() { return &_bm; } | |
| 61 | |
| 62 void recount_occupied() { | |
| 63 _occupied = (jint) bm()->count_one_bits(); | |
| 64 } | |
| 65 | |
| 66 PerRegionTable(HeapRegion* hr) : | |
| 67 _hr(hr), | |
| 68 _occupied(0), | |
| 6253 | 69 _bm(HeapRegion::CardsPerRegion, false /* in-resource-area */), |
| 70 _collision_list_next(NULL), _next(NULL), _prev(NULL) | |
| 342 | 71 {} |
| 72 | |
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73 void add_card_work(CardIdx_t from_card, bool par) { |
| 342 | 74 if (!_bm.at(from_card)) { |
| 75 if (par) { | |
| 76 if (_bm.par_at_put(from_card, 1)) { | |
| 77 Atomic::inc(&_occupied); | |
| 78 } | |
| 79 } else { | |
| 80 _bm.at_put(from_card, 1); | |
| 81 _occupied++; | |
| 82 } | |
| 83 } | |
| 84 } | |
| 85 | |
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86 void add_reference_work(OopOrNarrowOopStar from, bool par) { |
| 342 | 87 // Must make this robust in case "from" is not in "_hr", because of |
| 88 // concurrency. | |
| 89 | |
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90 if (G1TraceHeapRegionRememberedSet) { |
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91 gclog_or_tty->print_cr(" PRT::Add_reference_work(" PTR_FORMAT "->" PTR_FORMAT").", |
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92 from, |
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93 UseCompressedOops |
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94 ? (void *)oopDesc::load_decode_heap_oop((narrowOop*)from) |
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95 : (void *)oopDesc::load_decode_heap_oop((oop*)from)); |
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96 } |
| 342 | 97 |
| 98 HeapRegion* loc_hr = hr(); | |
| 99 // If the test below fails, then this table was reused concurrently | |
| 100 // with this operation. This is OK, since the old table was coarsened, | |
| 101 // and adding a bit to the new table is never incorrect. | |
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102 // If the table used to belong to a continues humongous region and is |
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103 // now reused for the corresponding start humongous region, we need to |
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104 // make sure that we detect this. Thus, we call is_in_reserved_raw() |
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105 // instead of just is_in_reserved() here. |
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106 if (loc_hr->is_in_reserved_raw(from)) { |
| 342 | 107 size_t hw_offset = pointer_delta((HeapWord*)from, loc_hr->bottom()); |
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108 CardIdx_t from_card = (CardIdx_t) |
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109 hw_offset >> (CardTableModRefBS::card_shift - LogHeapWordSize); |
| 342 | 110 |
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111 assert(0 <= from_card && (size_t)from_card < HeapRegion::CardsPerRegion, |
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112 "Must be in range."); |
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113 add_card_work(from_card, par); |
| 342 | 114 } |
| 115 } | |
| 116 | |
| 117 public: | |
| 118 | |
| 119 HeapRegion* hr() const { return _hr; } | |
| 120 | |
| 121 jint occupied() const { | |
| 122 // Overkill, but if we ever need it... | |
| 123 // guarantee(_occupied == _bm.count_one_bits(), "Check"); | |
| 124 return _occupied; | |
| 125 } | |
| 126 | |
| 6253 | 127 void init(HeapRegion* hr, bool clear_links_to_all_list) { |
| 128 if (clear_links_to_all_list) { | |
| 129 set_next(NULL); | |
| 130 set_prev(NULL); | |
| 131 } | |
| 342 | 132 _hr = hr; |
| 6253 | 133 _collision_list_next = NULL; |
| 342 | 134 _occupied = 0; |
| 135 _bm.clear(); | |
| 136 } | |
| 137 | |
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138 void add_reference(OopOrNarrowOopStar from) { |
| 342 | 139 add_reference_work(from, /*parallel*/ true); |
| 140 } | |
| 141 | |
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142 void seq_add_reference(OopOrNarrowOopStar from) { |
| 342 | 143 add_reference_work(from, /*parallel*/ false); |
| 144 } | |
| 145 | |
| 146 void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { | |
| 147 HeapWord* hr_bot = hr()->bottom(); | |
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148 size_t hr_first_card_index = ctbs->index_for(hr_bot); |
| 342 | 149 bm()->set_intersection_at_offset(*card_bm, hr_first_card_index); |
| 150 recount_occupied(); | |
| 151 } | |
| 152 | |
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153 void add_card(CardIdx_t from_card_index) { |
| 342 | 154 add_card_work(from_card_index, /*parallel*/ true); |
| 155 } | |
| 156 | |
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157 void seq_add_card(CardIdx_t from_card_index) { |
| 342 | 158 add_card_work(from_card_index, /*parallel*/ false); |
| 159 } | |
| 160 | |
| 161 // (Destructively) union the bitmap of the current table into the given | |
| 162 // bitmap (which is assumed to be of the same size.) | |
| 163 void union_bitmap_into(BitMap* bm) { | |
| 164 bm->set_union(_bm); | |
| 165 } | |
| 166 | |
| 167 // Mem size in bytes. | |
| 168 size_t mem_size() const { | |
| 169 return sizeof(this) + _bm.size_in_words() * HeapWordSize; | |
| 170 } | |
| 171 | |
| 172 // Requires "from" to be in "hr()". | |
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173 bool contains_reference(OopOrNarrowOopStar from) const { |
| 342 | 174 assert(hr()->is_in_reserved(from), "Precondition."); |
| 175 size_t card_ind = pointer_delta(from, hr()->bottom(), | |
| 176 CardTableModRefBS::card_size); | |
| 177 return _bm.at(card_ind); | |
| 178 } | |
| 179 | |
| 6253 | 180 // Bulk-free the PRTs from prt to last, assumes that they are |
| 181 // linked together using their _next field. | |
| 182 static void bulk_free(PerRegionTable* prt, PerRegionTable* last) { | |
| 342 | 183 while (true) { |
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184 PerRegionTable* fl = _free_list; |
| 6253 | 185 last->set_next(fl); |
| 186 PerRegionTable* res = (PerRegionTable*) Atomic::cmpxchg_ptr(prt, &_free_list, fl); | |
| 187 if (res == fl) { | |
| 188 return; | |
| 189 } | |
| 342 | 190 } |
| 191 ShouldNotReachHere(); | |
| 192 } | |
| 193 | |
| 6253 | 194 static void free(PerRegionTable* prt) { |
| 195 bulk_free(prt, prt); | |
| 196 } | |
| 197 | |
| 198 // Returns an initialized PerRegionTable instance. | |
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199 static PerRegionTable* alloc(HeapRegion* hr) { |
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200 PerRegionTable* fl = _free_list; |
| 342 | 201 while (fl != NULL) { |
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202 PerRegionTable* nxt = fl->next(); |
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203 PerRegionTable* res = |
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204 (PerRegionTable*) |
| 342 | 205 Atomic::cmpxchg_ptr(nxt, &_free_list, fl); |
| 206 if (res == fl) { | |
| 6253 | 207 fl->init(hr, true); |
| 342 | 208 return fl; |
| 209 } else { | |
| 210 fl = _free_list; | |
| 211 } | |
| 212 } | |
| 213 assert(fl == NULL, "Loop condition."); | |
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214 return new PerRegionTable(hr); |
| 342 | 215 } |
| 216 | |
| 6253 | 217 PerRegionTable* next() const { return _next; } |
| 218 void set_next(PerRegionTable* next) { _next = next; } | |
| 219 PerRegionTable* prev() const { return _prev; } | |
| 220 void set_prev(PerRegionTable* prev) { _prev = prev; } | |
| 221 | |
| 222 // Accessor and Modification routines for the pointer for the | |
| 223 // singly linked collision list that links the PRTs within the | |
| 224 // OtherRegionsTable::_fine_grain_regions hash table. | |
| 225 // | |
| 226 // It might be useful to also make the collision list doubly linked | |
| 227 // to avoid iteration over the collisions list during scrubbing/deletion. | |
| 228 // OTOH there might not be many collisions. | |
| 229 | |
| 230 PerRegionTable* collision_list_next() const { | |
| 231 return _collision_list_next; | |
| 232 } | |
| 233 | |
| 234 void set_collision_list_next(PerRegionTable* next) { | |
| 235 _collision_list_next = next; | |
| 236 } | |
| 237 | |
| 238 PerRegionTable** collision_list_next_addr() { | |
| 239 return &_collision_list_next; | |
| 240 } | |
| 241 | |
| 342 | 242 static size_t fl_mem_size() { |
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243 PerRegionTable* cur = _free_list; |
| 342 | 244 size_t res = 0; |
| 245 while (cur != NULL) { | |
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246 res += cur->mem_size(); |
| 342 | 247 cur = cur->next(); |
| 248 } | |
| 249 return res; | |
| 250 } | |
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251 |
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252 static void test_fl_mem_size(); |
| 342 | 253 }; |
| 254 | |
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255 PerRegionTable* PerRegionTable::_free_list = NULL; |
| 342 | 256 |
| 257 size_t OtherRegionsTable::_max_fine_entries = 0; | |
| 258 size_t OtherRegionsTable::_mod_max_fine_entries_mask = 0; | |
| 259 size_t OtherRegionsTable::_fine_eviction_stride = 0; | |
| 260 size_t OtherRegionsTable::_fine_eviction_sample_size = 0; | |
| 261 | |
| 262 OtherRegionsTable::OtherRegionsTable(HeapRegion* hr) : | |
| 263 _g1h(G1CollectedHeap::heap()), | |
| 264 _m(Mutex::leaf, "An OtherRegionsTable lock", true), | |
| 265 _hr(hr), | |
| 266 _coarse_map(G1CollectedHeap::heap()->max_regions(), | |
| 267 false /* in-resource-area */), | |
| 268 _fine_grain_regions(NULL), | |
| 6253 | 269 _first_all_fine_prts(NULL), _last_all_fine_prts(NULL), |
| 342 | 270 _n_fine_entries(0), _n_coarse_entries(0), |
| 271 _fine_eviction_start(0), | |
| 272 _sparse_table(hr) | |
| 273 { | |
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274 typedef PerRegionTable* PerRegionTablePtr; |
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275 |
| 342 | 276 if (_max_fine_entries == 0) { |
| 277 assert(_mod_max_fine_entries_mask == 0, "Both or none."); | |
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278 size_t max_entries_log = (size_t)log2_long((jlong)G1RSetRegionEntries); |
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279 _max_fine_entries = (size_t)1 << max_entries_log; |
| 342 | 280 _mod_max_fine_entries_mask = _max_fine_entries - 1; |
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281 |
| 342 | 282 assert(_fine_eviction_sample_size == 0 |
| 283 && _fine_eviction_stride == 0, "All init at same time."); | |
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284 _fine_eviction_sample_size = MAX2((size_t)4, max_entries_log); |
| 342 | 285 _fine_eviction_stride = _max_fine_entries / _fine_eviction_sample_size; |
| 286 } | |
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287 |
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288 _fine_grain_regions = NEW_C_HEAP_ARRAY3(PerRegionTablePtr, _max_fine_entries, |
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289 mtGC, 0, AllocFailStrategy::RETURN_NULL); |
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290 |
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291 if (_fine_grain_regions == NULL) { |
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292 vm_exit_out_of_memory(sizeof(void*)*_max_fine_entries, OOM_MALLOC_ERROR, |
| 342 | 293 "Failed to allocate _fine_grain_entries."); |
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294 } |
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295 |
| 342 | 296 for (size_t i = 0; i < _max_fine_entries; i++) { |
| 297 _fine_grain_regions[i] = NULL; | |
| 298 } | |
| 299 } | |
| 300 | |
| 6253 | 301 void OtherRegionsTable::link_to_all(PerRegionTable* prt) { |
| 302 // We always append to the beginning of the list for convenience; | |
| 303 // the order of entries in this list does not matter. | |
| 304 if (_first_all_fine_prts != NULL) { | |
| 305 assert(_first_all_fine_prts->prev() == NULL, "invariant"); | |
| 306 _first_all_fine_prts->set_prev(prt); | |
| 307 prt->set_next(_first_all_fine_prts); | |
| 308 } else { | |
| 309 // this is the first element we insert. Adjust the "last" pointer | |
| 310 _last_all_fine_prts = prt; | |
| 311 assert(prt->next() == NULL, "just checking"); | |
| 312 } | |
| 313 // the new element is always the first element without a predecessor | |
| 314 prt->set_prev(NULL); | |
| 315 _first_all_fine_prts = prt; | |
| 316 | |
| 317 assert(prt->prev() == NULL, "just checking"); | |
| 318 assert(_first_all_fine_prts == prt, "just checking"); | |
| 319 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || | |
| 320 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), | |
| 321 "just checking"); | |
| 322 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, | |
| 323 "just checking"); | |
| 324 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, | |
| 325 "just checking"); | |
| 326 } | |
| 327 | |
| 328 void OtherRegionsTable::unlink_from_all(PerRegionTable* prt) { | |
| 329 if (prt->prev() != NULL) { | |
| 330 assert(_first_all_fine_prts != prt, "just checking"); | |
| 331 prt->prev()->set_next(prt->next()); | |
| 332 // removing the last element in the list? | |
| 333 if (_last_all_fine_prts == prt) { | |
| 334 _last_all_fine_prts = prt->prev(); | |
| 335 } | |
| 336 } else { | |
| 337 assert(_first_all_fine_prts == prt, "just checking"); | |
| 338 _first_all_fine_prts = prt->next(); | |
| 339 // list is empty now? | |
| 340 if (_first_all_fine_prts == NULL) { | |
| 341 _last_all_fine_prts = NULL; | |
| 342 } | |
| 343 } | |
| 344 | |
| 345 if (prt->next() != NULL) { | |
| 346 prt->next()->set_prev(prt->prev()); | |
| 347 } | |
| 348 | |
| 349 prt->set_next(NULL); | |
| 350 prt->set_prev(NULL); | |
| 351 | |
| 352 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || | |
| 353 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), | |
| 354 "just checking"); | |
| 355 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, | |
| 356 "just checking"); | |
| 357 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, | |
| 358 "just checking"); | |
| 359 } | |
| 360 | |
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361 int** OtherRegionsTable::_from_card_cache = NULL; |
| 342 | 362 size_t OtherRegionsTable::_from_card_cache_max_regions = 0; |
| 363 size_t OtherRegionsTable::_from_card_cache_mem_size = 0; | |
| 364 | |
| 365 void OtherRegionsTable::init_from_card_cache(size_t max_regions) { | |
| 366 _from_card_cache_max_regions = max_regions; | |
| 367 | |
| 368 int n_par_rs = HeapRegionRemSet::num_par_rem_sets(); | |
| 6197 | 369 _from_card_cache = NEW_C_HEAP_ARRAY(int*, n_par_rs, mtGC); |
| 342 | 370 for (int i = 0; i < n_par_rs; i++) { |
| 6197 | 371 _from_card_cache[i] = NEW_C_HEAP_ARRAY(int, max_regions, mtGC); |
| 342 | 372 for (size_t j = 0; j < max_regions; j++) { |
| 373 _from_card_cache[i][j] = -1; // An invalid value. | |
| 374 } | |
| 375 } | |
| 376 _from_card_cache_mem_size = n_par_rs * max_regions * sizeof(int); | |
| 377 } | |
| 378 | |
| 379 void OtherRegionsTable::shrink_from_card_cache(size_t new_n_regs) { | |
| 380 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
| 381 assert(new_n_regs <= _from_card_cache_max_regions, "Must be within max."); | |
| 382 for (size_t j = new_n_regs; j < _from_card_cache_max_regions; j++) { | |
| 383 _from_card_cache[i][j] = -1; // An invalid value. | |
| 384 } | |
| 385 } | |
| 386 } | |
| 387 | |
| 388 #ifndef PRODUCT | |
| 389 void OtherRegionsTable::print_from_card_cache() { | |
| 390 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
| 391 for (size_t j = 0; j < _from_card_cache_max_regions; j++) { | |
| 392 gclog_or_tty->print_cr("_from_card_cache[%d][%d] = %d.", | |
| 393 i, j, _from_card_cache[i][j]); | |
| 394 } | |
| 395 } | |
| 396 } | |
| 397 #endif | |
| 398 | |
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399 void OtherRegionsTable::add_reference(OopOrNarrowOopStar from, int tid) { |
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400 size_t cur_hrs_ind = (size_t) hr()->hrs_index(); |
| 342 | 401 |
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402 if (G1TraceHeapRegionRememberedSet) { |
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403 gclog_or_tty->print_cr("ORT::add_reference_work(" PTR_FORMAT "->" PTR_FORMAT ").", |
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404 from, |
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405 UseCompressedOops |
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406 ? (void *)oopDesc::load_decode_heap_oop((narrowOop*)from) |
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407 : (void *)oopDesc::load_decode_heap_oop((oop*)from)); |
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408 } |
| 342 | 409 |
| 410 int from_card = (int)(uintptr_t(from) >> CardTableModRefBS::card_shift); | |
| 411 | |
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412 if (G1TraceHeapRegionRememberedSet) { |
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413 gclog_or_tty->print_cr("Table for [" PTR_FORMAT "...): card %d (cache = %d)", |
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414 hr()->bottom(), from_card, |
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415 _from_card_cache[tid][cur_hrs_ind]); |
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416 } |
| 342 | 417 |
| 418 if (from_card == _from_card_cache[tid][cur_hrs_ind]) { | |
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419 if (G1TraceHeapRegionRememberedSet) { |
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420 gclog_or_tty->print_cr(" from-card cache hit."); |
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421 } |
| 342 | 422 assert(contains_reference(from), "We just added it!"); |
| 423 return; | |
| 424 } else { | |
| 425 _from_card_cache[tid][cur_hrs_ind] = from_card; | |
| 426 } | |
| 427 | |
| 428 // Note that this may be a continued H region. | |
| 429 HeapRegion* from_hr = _g1h->heap_region_containing_raw(from); | |
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430 RegionIdx_t from_hrs_ind = (RegionIdx_t) from_hr->hrs_index(); |
| 342 | 431 |
| 432 // If the region is already coarsened, return. | |
| 433 if (_coarse_map.at(from_hrs_ind)) { | |
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434 if (G1TraceHeapRegionRememberedSet) { |
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435 gclog_or_tty->print_cr(" coarse map hit."); |
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436 } |
| 342 | 437 assert(contains_reference(from), "We just added it!"); |
| 438 return; | |
| 439 } | |
| 440 | |
| 441 // Otherwise find a per-region table to add it to. | |
| 442 size_t ind = from_hrs_ind & _mod_max_fine_entries_mask; | |
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443 PerRegionTable* prt = find_region_table(ind, from_hr); |
| 342 | 444 if (prt == NULL) { |
| 445 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
| 446 // Confirm that it's really not there... | |
| 447 prt = find_region_table(ind, from_hr); | |
| 448 if (prt == NULL) { | |
| 449 | |
| 450 uintptr_t from_hr_bot_card_index = | |
| 451 uintptr_t(from_hr->bottom()) | |
| 452 >> CardTableModRefBS::card_shift; | |
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453 CardIdx_t card_index = from_card - from_hr_bot_card_index; |
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454 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
| 342 | 455 "Must be in range."); |
| 456 if (G1HRRSUseSparseTable && | |
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457 _sparse_table.add_card(from_hrs_ind, card_index)) { |
| 342 | 458 if (G1RecordHRRSOops) { |
| 459 HeapRegionRemSet::record(hr(), from); | |
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460 if (G1TraceHeapRegionRememberedSet) { |
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461 gclog_or_tty->print(" Added card " PTR_FORMAT " to region " |
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462 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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463 align_size_down(uintptr_t(from), |
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464 CardTableModRefBS::card_size), |
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465 hr()->bottom(), from); |
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466 } |
| 342 | 467 } |
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468 if (G1TraceHeapRegionRememberedSet) { |
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469 gclog_or_tty->print_cr(" added card to sparse table."); |
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470 } |
| 342 | 471 assert(contains_reference_locked(from), "We just added it!"); |
| 472 return; | |
| 473 } else { | |
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474 if (G1TraceHeapRegionRememberedSet) { |
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475 gclog_or_tty->print_cr(" [tid %d] sparse table entry " |
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476 "overflow(f: %d, t: %d)", |
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477 tid, from_hrs_ind, cur_hrs_ind); |
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478 } |
| 342 | 479 } |
| 480 | |
| 481 if (_n_fine_entries == _max_fine_entries) { | |
| 482 prt = delete_region_table(); | |
| 6253 | 483 // There is no need to clear the links to the 'all' list here: |
| 484 // prt will be reused immediately, i.e. remain in the 'all' list. | |
| 485 prt->init(from_hr, false /* clear_links_to_all_list */); | |
| 342 | 486 } else { |
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487 prt = PerRegionTable::alloc(from_hr); |
| 6253 | 488 link_to_all(prt); |
| 342 | 489 } |
| 490 | |
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491 PerRegionTable* first_prt = _fine_grain_regions[ind]; |
| 6253 | 492 prt->set_collision_list_next(first_prt); |
| 342 | 493 _fine_grain_regions[ind] = prt; |
| 494 _n_fine_entries++; | |
| 495 | |
| 496 if (G1HRRSUseSparseTable) { | |
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497 // Transfer from sparse to fine-grain. |
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498 SparsePRTEntry *sprt_entry = _sparse_table.get_entry(from_hrs_ind); |
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499 assert(sprt_entry != NULL, "There should have been an entry"); |
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500 for (int i = 0; i < SparsePRTEntry::cards_num(); i++) { |
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501 CardIdx_t c = sprt_entry->card(i); |
| 342 | 502 if (c != SparsePRTEntry::NullEntry) { |
| 503 prt->add_card(c); | |
| 504 } | |
| 505 } | |
| 506 // Now we can delete the sparse entry. | |
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507 bool res = _sparse_table.delete_entry(from_hrs_ind); |
| 342 | 508 assert(res, "It should have been there."); |
| 509 } | |
| 510 } | |
| 511 assert(prt != NULL && prt->hr() == from_hr, "consequence"); | |
| 512 } | |
| 513 // Note that we can't assert "prt->hr() == from_hr", because of the | |
| 514 // possibility of concurrent reuse. But see head comment of | |
| 515 // OtherRegionsTable for why this is OK. | |
| 516 assert(prt != NULL, "Inv"); | |
| 517 | |
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518 prt->add_reference(from); |
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519 |
| 342 | 520 if (G1RecordHRRSOops) { |
| 521 HeapRegionRemSet::record(hr(), from); | |
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522 if (G1TraceHeapRegionRememberedSet) { |
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523 gclog_or_tty->print("Added card " PTR_FORMAT " to region " |
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524 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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525 align_size_down(uintptr_t(from), |
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526 CardTableModRefBS::card_size), |
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527 hr()->bottom(), from); |
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528 } |
| 342 | 529 } |
| 530 assert(contains_reference(from), "We just added it!"); | |
| 531 } | |
| 532 | |
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533 PerRegionTable* |
| 342 | 534 OtherRegionsTable::find_region_table(size_t ind, HeapRegion* hr) const { |
| 535 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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536 PerRegionTable* prt = _fine_grain_regions[ind]; |
| 342 | 537 while (prt != NULL && prt->hr() != hr) { |
| 6253 | 538 prt = prt->collision_list_next(); |
| 342 | 539 } |
| 540 // Loop postcondition is the method postcondition. | |
| 541 return prt; | |
| 542 } | |
| 543 | |
| 544 jint OtherRegionsTable::_n_coarsenings = 0; | |
| 545 | |
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546 PerRegionTable* OtherRegionsTable::delete_region_table() { |
| 342 | 547 assert(_m.owned_by_self(), "Precondition"); |
| 548 assert(_n_fine_entries == _max_fine_entries, "Precondition"); | |
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549 PerRegionTable* max = NULL; |
| 342 | 550 jint max_occ = 0; |
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551 PerRegionTable** max_prev; |
| 342 | 552 size_t max_ind; |
| 553 | |
| 554 size_t i = _fine_eviction_start; | |
| 555 for (size_t k = 0; k < _fine_eviction_sample_size; k++) { | |
| 556 size_t ii = i; | |
| 557 // Make sure we get a non-NULL sample. | |
| 558 while (_fine_grain_regions[ii] == NULL) { | |
| 559 ii++; | |
| 560 if (ii == _max_fine_entries) ii = 0; | |
| 561 guarantee(ii != i, "We must find one."); | |
| 562 } | |
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563 PerRegionTable** prev = &_fine_grain_regions[ii]; |
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564 PerRegionTable* cur = *prev; |
| 342 | 565 while (cur != NULL) { |
| 566 jint cur_occ = cur->occupied(); | |
| 567 if (max == NULL || cur_occ > max_occ) { | |
| 568 max = cur; | |
| 569 max_prev = prev; | |
| 570 max_ind = i; | |
| 571 max_occ = cur_occ; | |
| 572 } | |
| 6253 | 573 prev = cur->collision_list_next_addr(); |
| 574 cur = cur->collision_list_next(); | |
| 342 | 575 } |
| 576 i = i + _fine_eviction_stride; | |
| 577 if (i >= _n_fine_entries) i = i - _n_fine_entries; | |
| 578 } | |
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579 |
| 342 | 580 _fine_eviction_start++; |
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581 |
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582 if (_fine_eviction_start >= _n_fine_entries) { |
| 342 | 583 _fine_eviction_start -= _n_fine_entries; |
| 584 } | |
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585 |
| 342 | 586 guarantee(max != NULL, "Since _n_fine_entries > 0"); |
| 587 | |
| 588 // Set the corresponding coarse bit. | |
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589 size_t max_hrs_index = (size_t) max->hr()->hrs_index(); |
| 342 | 590 if (!_coarse_map.at(max_hrs_index)) { |
| 591 _coarse_map.at_put(max_hrs_index, true); | |
| 592 _n_coarse_entries++; | |
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593 if (G1TraceHeapRegionRememberedSet) { |
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594 gclog_or_tty->print("Coarsened entry in region [" PTR_FORMAT "...] " |
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595 "for region [" PTR_FORMAT "...] (%d coarse entries).\n", |
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596 hr()->bottom(), |
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597 max->hr()->bottom(), |
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598 _n_coarse_entries); |
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599 } |
| 342 | 600 } |
| 601 | |
| 602 // Unsplice. | |
| 6253 | 603 *max_prev = max->collision_list_next(); |
| 342 | 604 Atomic::inc(&_n_coarsenings); |
| 605 _n_fine_entries--; | |
| 606 return max; | |
| 607 } | |
| 608 | |
| 609 | |
| 610 // At present, this must be called stop-world single-threaded. | |
| 611 void OtherRegionsTable::scrub(CardTableModRefBS* ctbs, | |
| 612 BitMap* region_bm, BitMap* card_bm) { | |
| 613 // First eliminated garbage regions from the coarse map. | |
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614 if (G1RSScrubVerbose) { |
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615 gclog_or_tty->print_cr("Scrubbing region %u:", hr()->hrs_index()); |
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616 } |
| 342 | 617 |
| 618 assert(_coarse_map.size() == region_bm->size(), "Precondition"); | |
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619 if (G1RSScrubVerbose) { |
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620 gclog_or_tty->print(" Coarse map: before = "SIZE_FORMAT"...", |
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621 _n_coarse_entries); |
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622 } |
| 342 | 623 _coarse_map.set_intersection(*region_bm); |
| 624 _n_coarse_entries = _coarse_map.count_one_bits(); | |
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625 if (G1RSScrubVerbose) { |
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626 gclog_or_tty->print_cr(" after = "SIZE_FORMAT".", _n_coarse_entries); |
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627 } |
| 342 | 628 |
| 629 // Now do the fine-grained maps. | |
| 630 for (size_t i = 0; i < _max_fine_entries; i++) { | |
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631 PerRegionTable* cur = _fine_grain_regions[i]; |
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632 PerRegionTable** prev = &_fine_grain_regions[i]; |
| 342 | 633 while (cur != NULL) { |
| 6253 | 634 PerRegionTable* nxt = cur->collision_list_next(); |
| 342 | 635 // If the entire region is dead, eliminate. |
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636 if (G1RSScrubVerbose) { |
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637 gclog_or_tty->print_cr(" For other region %u:", |
| 3766 | 638 cur->hr()->hrs_index()); |
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639 } |
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640 if (!region_bm->at((size_t) cur->hr()->hrs_index())) { |
| 342 | 641 *prev = nxt; |
| 6253 | 642 cur->set_collision_list_next(NULL); |
| 342 | 643 _n_fine_entries--; |
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644 if (G1RSScrubVerbose) { |
| 342 | 645 gclog_or_tty->print_cr(" deleted via region map."); |
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646 } |
| 6253 | 647 unlink_from_all(cur); |
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648 PerRegionTable::free(cur); |
| 342 | 649 } else { |
| 650 // Do fine-grain elimination. | |
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651 if (G1RSScrubVerbose) { |
| 342 | 652 gclog_or_tty->print(" occ: before = %4d.", cur->occupied()); |
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653 } |
| 342 | 654 cur->scrub(ctbs, card_bm); |
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655 if (G1RSScrubVerbose) { |
| 342 | 656 gclog_or_tty->print_cr(" after = %4d.", cur->occupied()); |
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657 } |
| 342 | 658 // Did that empty the table completely? |
| 659 if (cur->occupied() == 0) { | |
| 660 *prev = nxt; | |
| 6253 | 661 cur->set_collision_list_next(NULL); |
| 342 | 662 _n_fine_entries--; |
| 6253 | 663 unlink_from_all(cur); |
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664 PerRegionTable::free(cur); |
| 342 | 665 } else { |
| 6253 | 666 prev = cur->collision_list_next_addr(); |
| 342 | 667 } |
| 668 } | |
| 669 cur = nxt; | |
| 670 } | |
| 671 } | |
| 672 // Since we may have deleted a from_card_cache entry from the RS, clear | |
| 673 // the FCC. | |
| 674 clear_fcc(); | |
| 675 } | |
| 676 | |
| 677 | |
| 678 size_t OtherRegionsTable::occupied() const { | |
| 679 // Cast away const in this case. | |
| 680 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
| 681 size_t sum = occ_fine(); | |
| 682 sum += occ_sparse(); | |
| 683 sum += occ_coarse(); | |
| 684 return sum; | |
| 685 } | |
| 686 | |
| 687 size_t OtherRegionsTable::occ_fine() const { | |
| 688 size_t sum = 0; | |
| 6253 | 689 |
| 690 size_t num = 0; | |
| 691 PerRegionTable * cur = _first_all_fine_prts; | |
| 692 while (cur != NULL) { | |
| 693 sum += cur->occupied(); | |
| 694 cur = cur->next(); | |
| 695 num++; | |
| 342 | 696 } |
| 6253 | 697 guarantee(num == _n_fine_entries, "just checking"); |
| 342 | 698 return sum; |
| 699 } | |
| 700 | |
| 701 size_t OtherRegionsTable::occ_coarse() const { | |
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702 return (_n_coarse_entries * HeapRegion::CardsPerRegion); |
| 342 | 703 } |
| 704 | |
| 705 size_t OtherRegionsTable::occ_sparse() const { | |
| 706 return _sparse_table.occupied(); | |
| 707 } | |
| 708 | |
| 709 size_t OtherRegionsTable::mem_size() const { | |
| 710 // Cast away const in this case. | |
| 711 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
| 712 size_t sum = 0; | |
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713 // all PRTs are of the same size so it is sufficient to query only one of them. |
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714 if (_first_all_fine_prts != NULL) { |
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715 assert(_last_all_fine_prts != NULL && |
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716 _first_all_fine_prts->mem_size() == _last_all_fine_prts->mem_size(), "check that mem_size() is constant"); |
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717 sum += _first_all_fine_prts->mem_size() * _n_fine_entries; |
| 342 | 718 } |
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719 sum += (sizeof(PerRegionTable*) * _max_fine_entries); |
| 342 | 720 sum += (_coarse_map.size_in_words() * HeapWordSize); |
| 721 sum += (_sparse_table.mem_size()); | |
| 722 sum += sizeof(*this) - sizeof(_sparse_table); // Avoid double counting above. | |
| 723 return sum; | |
| 724 } | |
| 725 | |
| 726 size_t OtherRegionsTable::static_mem_size() { | |
| 727 return _from_card_cache_mem_size; | |
| 728 } | |
| 729 | |
| 730 size_t OtherRegionsTable::fl_mem_size() { | |
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731 return PerRegionTable::fl_mem_size(); |
| 342 | 732 } |
| 733 | |
| 734 void OtherRegionsTable::clear_fcc() { | |
| 6253 | 735 size_t hrs_idx = hr()->hrs_index(); |
| 342 | 736 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { |
| 6253 | 737 _from_card_cache[i][hrs_idx] = -1; |
| 342 | 738 } |
| 739 } | |
| 740 | |
| 741 void OtherRegionsTable::clear() { | |
| 742 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
| 6253 | 743 // if there are no entries, skip this step |
| 744 if (_first_all_fine_prts != NULL) { | |
| 745 guarantee(_first_all_fine_prts != NULL && _last_all_fine_prts != NULL, "just checking"); | |
| 746 PerRegionTable::bulk_free(_first_all_fine_prts, _last_all_fine_prts); | |
| 747 memset(_fine_grain_regions, 0, _max_fine_entries * sizeof(_fine_grain_regions[0])); | |
| 748 } else { | |
| 749 guarantee(_first_all_fine_prts == NULL && _last_all_fine_prts == NULL, "just checking"); | |
| 342 | 750 } |
| 6253 | 751 |
| 752 _first_all_fine_prts = _last_all_fine_prts = NULL; | |
| 342 | 753 _sparse_table.clear(); |
| 754 _coarse_map.clear(); | |
| 755 _n_fine_entries = 0; | |
| 756 _n_coarse_entries = 0; | |
| 757 | |
| 758 clear_fcc(); | |
| 759 } | |
| 760 | |
| 761 void OtherRegionsTable::clear_incoming_entry(HeapRegion* from_hr) { | |
| 762 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
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763 size_t hrs_ind = (size_t) from_hr->hrs_index(); |
| 342 | 764 size_t ind = hrs_ind & _mod_max_fine_entries_mask; |
| 765 if (del_single_region_table(ind, from_hr)) { | |
| 766 assert(!_coarse_map.at(hrs_ind), "Inv"); | |
| 767 } else { | |
| 768 _coarse_map.par_at_put(hrs_ind, 0); | |
| 769 } | |
| 770 // Check to see if any of the fcc entries come from here. | |
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771 size_t hr_ind = (size_t) hr()->hrs_index(); |
| 342 | 772 for (int tid = 0; tid < HeapRegionRemSet::num_par_rem_sets(); tid++) { |
| 773 int fcc_ent = _from_card_cache[tid][hr_ind]; | |
| 774 if (fcc_ent != -1) { | |
| 775 HeapWord* card_addr = (HeapWord*) | |
| 776 (uintptr_t(fcc_ent) << CardTableModRefBS::card_shift); | |
| 777 if (hr()->is_in_reserved(card_addr)) { | |
| 778 // Clear the from card cache. | |
| 779 _from_card_cache[tid][hr_ind] = -1; | |
| 780 } | |
| 781 } | |
| 782 } | |
| 783 } | |
| 784 | |
| 785 bool OtherRegionsTable::del_single_region_table(size_t ind, | |
| 786 HeapRegion* hr) { | |
| 787 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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788 PerRegionTable** prev_addr = &_fine_grain_regions[ind]; |
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789 PerRegionTable* prt = *prev_addr; |
| 342 | 790 while (prt != NULL && prt->hr() != hr) { |
| 6253 | 791 prev_addr = prt->collision_list_next_addr(); |
| 792 prt = prt->collision_list_next(); | |
| 342 | 793 } |
| 794 if (prt != NULL) { | |
| 795 assert(prt->hr() == hr, "Loop postcondition."); | |
| 6253 | 796 *prev_addr = prt->collision_list_next(); |
| 797 unlink_from_all(prt); | |
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798 PerRegionTable::free(prt); |
| 342 | 799 _n_fine_entries--; |
| 800 return true; | |
| 801 } else { | |
| 802 return false; | |
| 803 } | |
| 804 } | |
| 805 | |
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806 bool OtherRegionsTable::contains_reference(OopOrNarrowOopStar from) const { |
| 342 | 807 // Cast away const in this case. |
| 808 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
| 809 return contains_reference_locked(from); | |
| 810 } | |
| 811 | |
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812 bool OtherRegionsTable::contains_reference_locked(OopOrNarrowOopStar from) const { |
| 342 | 813 HeapRegion* hr = _g1h->heap_region_containing_raw(from); |
| 814 if (hr == NULL) return false; | |
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815 RegionIdx_t hr_ind = (RegionIdx_t) hr->hrs_index(); |
| 342 | 816 // Is this region in the coarse map? |
| 817 if (_coarse_map.at(hr_ind)) return true; | |
| 818 | |
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819 PerRegionTable* prt = find_region_table(hr_ind & _mod_max_fine_entries_mask, |
| 342 | 820 hr); |
| 821 if (prt != NULL) { | |
| 822 return prt->contains_reference(from); | |
| 823 | |
| 824 } else { | |
| 825 uintptr_t from_card = | |
| 826 (uintptr_t(from) >> CardTableModRefBS::card_shift); | |
| 827 uintptr_t hr_bot_card_index = | |
| 828 uintptr_t(hr->bottom()) >> CardTableModRefBS::card_shift; | |
| 829 assert(from_card >= hr_bot_card_index, "Inv"); | |
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830 CardIdx_t card_index = from_card - hr_bot_card_index; |
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831 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
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832 "Must be in range."); |
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833 return _sparse_table.contains_card(hr_ind, card_index); |
| 342 | 834 } |
| 835 | |
| 836 | |
| 837 } | |
| 838 | |
| 2173 | 839 void |
| 840 OtherRegionsTable::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
| 841 _sparse_table.do_cleanup_work(hrrs_cleanup_task); | |
| 842 } | |
| 843 | |
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844 // Determines how many threads can add records to an rset in parallel. |
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845 // This can be done by either mutator threads together with the |
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846 // concurrent refinement threads or GC threads. |
| 342 | 847 int HeapRegionRemSet::num_par_rem_sets() { |
|
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848 return (int)MAX2(DirtyCardQueueSet::num_par_ids() + ConcurrentG1Refine::thread_num(), ParallelGCThreads); |
| 342 | 849 } |
| 850 | |
| 851 HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, | |
| 852 HeapRegion* hr) | |
| 12080 | 853 : _bosa(bosa), _strong_code_roots_list(NULL), _other_regions(hr) { |
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854 reset_for_par_iteration(); |
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855 } |
| 342 | 856 |
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857 void HeapRegionRemSet::setup_remset_size() { |
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858 // Setup sparse and fine-grain tables sizes. |
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859 // table_size = base * (log(region_size / 1M) + 1) |
|
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860 const int LOG_M = 20; |
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861 int region_size_log_mb = MAX2(HeapRegion::LogOfHRGrainBytes - LOG_M, 0); |
|
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862 if (FLAG_IS_DEFAULT(G1RSetSparseRegionEntries)) { |
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863 G1RSetSparseRegionEntries = G1RSetSparseRegionEntriesBase * (region_size_log_mb + 1); |
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864 } |
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865 if (FLAG_IS_DEFAULT(G1RSetRegionEntries)) { |
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866 G1RSetRegionEntries = G1RSetRegionEntriesBase * (region_size_log_mb + 1); |
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867 } |
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868 guarantee(G1RSetSparseRegionEntries > 0 && G1RSetRegionEntries > 0 , "Sanity"); |
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869 } |
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870 |
| 342 | 871 bool HeapRegionRemSet::claim_iter() { |
| 872 if (_iter_state != Unclaimed) return false; | |
| 873 jint res = Atomic::cmpxchg(Claimed, (jint*)(&_iter_state), Unclaimed); | |
| 874 return (res == Unclaimed); | |
| 875 } | |
| 876 | |
| 877 void HeapRegionRemSet::set_iter_complete() { | |
| 878 _iter_state = Complete; | |
| 879 } | |
| 880 | |
| 881 bool HeapRegionRemSet::iter_is_complete() { | |
| 882 return _iter_state == Complete; | |
| 883 } | |
| 884 | |
| 885 #ifndef PRODUCT | |
| 886 void HeapRegionRemSet::print() const { | |
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887 HeapRegionRemSetIterator iter(this); |
| 342 | 888 size_t card_index; |
| 889 while (iter.has_next(card_index)) { | |
| 890 HeapWord* card_start = | |
| 891 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
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892 gclog_or_tty->print_cr(" Card " PTR_FORMAT, card_start); |
| 342 | 893 } |
| 894 if (iter.n_yielded() != occupied()) { | |
| 895 gclog_or_tty->print_cr("Yielded disagrees with occupied:"); | |
| 896 gclog_or_tty->print_cr(" %6d yielded (%6d coarse, %6d fine).", | |
| 897 iter.n_yielded(), | |
| 898 iter.n_yielded_coarse(), iter.n_yielded_fine()); | |
| 899 gclog_or_tty->print_cr(" %6d occ (%6d coarse, %6d fine).", | |
| 900 occupied(), occ_coarse(), occ_fine()); | |
| 901 } | |
| 902 guarantee(iter.n_yielded() == occupied(), | |
| 903 "We should have yielded all the represented cards."); | |
| 904 } | |
| 905 #endif | |
| 906 | |
| 907 void HeapRegionRemSet::cleanup() { | |
| 908 SparsePRT::cleanup_all(); | |
| 909 } | |
| 910 | |
| 911 void HeapRegionRemSet::clear() { | |
| 12080 | 912 if (_strong_code_roots_list != NULL) { |
| 913 delete _strong_code_roots_list; | |
| 914 } | |
| 915 _strong_code_roots_list = new (ResourceObj::C_HEAP, mtGC) | |
| 916 GrowableArray<nmethod*>(10, 0, NULL, true); | |
| 917 | |
| 342 | 918 _other_regions.clear(); |
| 919 assert(occupied() == 0, "Should be clear."); | |
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920 reset_for_par_iteration(); |
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921 } |
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922 |
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923 void HeapRegionRemSet::reset_for_par_iteration() { |
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924 _iter_state = Unclaimed; |
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925 _iter_claimed = 0; |
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926 // It's good to check this to make sure that the two methods are in sync. |
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927 assert(verify_ready_for_par_iteration(), "post-condition"); |
| 342 | 928 } |
| 929 | |
| 930 void HeapRegionRemSet::scrub(CardTableModRefBS* ctbs, | |
| 931 BitMap* region_bm, BitMap* card_bm) { | |
| 932 _other_regions.scrub(ctbs, region_bm, card_bm); | |
| 933 } | |
| 934 | |
| 12080 | 935 |
| 936 // Code roots support | |
| 937 | |
| 938 void HeapRegionRemSet::add_strong_code_root(nmethod* nm) { | |
| 939 assert(nm != NULL, "sanity"); | |
| 940 // Search for the code blob from the RHS to avoid | |
| 941 // duplicate entries as much as possible | |
| 942 if (_strong_code_roots_list->find_from_end(nm) < 0) { | |
| 943 // Code blob isn't already in the list | |
| 944 _strong_code_roots_list->push(nm); | |
| 945 } | |
| 946 } | |
| 947 | |
| 948 void HeapRegionRemSet::remove_strong_code_root(nmethod* nm) { | |
| 949 assert(nm != NULL, "sanity"); | |
| 950 int idx = _strong_code_roots_list->find(nm); | |
| 951 if (idx >= 0) { | |
| 952 _strong_code_roots_list->remove_at(idx); | |
| 953 } | |
| 954 // Check that there were no duplicates | |
| 955 guarantee(_strong_code_roots_list->find(nm) < 0, "duplicate entry found"); | |
| 956 } | |
| 957 | |
| 958 class NMethodMigrationOopClosure : public OopClosure { | |
| 959 G1CollectedHeap* _g1h; | |
| 960 HeapRegion* _from; | |
| 961 nmethod* _nm; | |
| 962 | |
| 963 uint _num_self_forwarded; | |
| 964 | |
| 965 template <class T> void do_oop_work(T* p) { | |
| 966 T heap_oop = oopDesc::load_heap_oop(p); | |
| 967 if (!oopDesc::is_null(heap_oop)) { | |
| 968 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
| 969 if (_from->is_in(obj)) { | |
| 970 // Reference still points into the source region. | |
| 971 // Since roots are immediately evacuated this means that | |
| 972 // we must have self forwarded the object | |
| 973 assert(obj->is_forwarded(), | |
| 974 err_msg("code roots should be immediately evacuated. " | |
| 975 "Ref: "PTR_FORMAT", " | |
| 976 "Obj: "PTR_FORMAT", " | |
| 977 "Region: "HR_FORMAT, | |
| 978 p, (void*) obj, HR_FORMAT_PARAMS(_from))); | |
| 979 assert(obj->forwardee() == obj, | |
| 980 err_msg("not self forwarded? obj = "PTR_FORMAT, (void*)obj)); | |
| 981 | |
| 982 // The object has been self forwarded. | |
| 983 // Note, if we're during an initial mark pause, there is | |
| 984 // no need to explicitly mark object. It will be marked | |
| 985 // during the regular evacuation failure handling code. | |
| 986 _num_self_forwarded++; | |
| 987 } else { | |
| 988 // The reference points into a promotion or to-space region | |
| 989 HeapRegion* to = _g1h->heap_region_containing(obj); | |
| 990 to->rem_set()->add_strong_code_root(_nm); | |
| 991 } | |
| 992 } | |
| 993 } | |
| 994 | |
| 995 public: | |
| 996 NMethodMigrationOopClosure(G1CollectedHeap* g1h, HeapRegion* from, nmethod* nm): | |
| 997 _g1h(g1h), _from(from), _nm(nm), _num_self_forwarded(0) {} | |
| 998 | |
| 999 void do_oop(narrowOop* p) { do_oop_work(p); } | |
| 1000 void do_oop(oop* p) { do_oop_work(p); } | |
| 1001 | |
| 1002 uint retain() { return _num_self_forwarded > 0; } | |
| 1003 }; | |
| 1004 | |
| 1005 void HeapRegionRemSet::migrate_strong_code_roots() { | |
| 1006 assert(hr()->in_collection_set(), "only collection set regions"); | |
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1007 assert(!hr()->isHumongous(), |
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1008 err_msg("humongous region "HR_FORMAT" should not have been added to the collection set", |
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1009 HR_FORMAT_PARAMS(hr()))); |
| 12080 | 1010 |
| 1011 ResourceMark rm; | |
| 1012 | |
| 1013 // List of code blobs to retain for this region | |
| 1014 GrowableArray<nmethod*> to_be_retained(10); | |
| 1015 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1016 | |
| 1017 while (_strong_code_roots_list->is_nonempty()) { | |
| 1018 nmethod *nm = _strong_code_roots_list->pop(); | |
| 1019 if (nm != NULL) { | |
| 1020 NMethodMigrationOopClosure oop_cl(g1h, hr(), nm); | |
| 1021 nm->oops_do(&oop_cl); | |
| 1022 if (oop_cl.retain()) { | |
| 1023 to_be_retained.push(nm); | |
| 1024 } | |
| 1025 } | |
| 1026 } | |
| 1027 | |
| 1028 // Now push any code roots we need to retain | |
| 1029 assert(to_be_retained.is_empty() || hr()->evacuation_failed(), | |
| 1030 "Retained nmethod list must be empty or " | |
| 1031 "evacuation of this region failed"); | |
| 1032 | |
| 1033 while (to_be_retained.is_nonempty()) { | |
| 1034 nmethod* nm = to_be_retained.pop(); | |
| 1035 assert(nm != NULL, "sanity"); | |
| 1036 add_strong_code_root(nm); | |
| 1037 } | |
| 1038 } | |
| 1039 | |
| 1040 void HeapRegionRemSet::strong_code_roots_do(CodeBlobClosure* blk) const { | |
| 1041 for (int i = 0; i < _strong_code_roots_list->length(); i += 1) { | |
| 1042 nmethod* nm = _strong_code_roots_list->at(i); | |
| 1043 blk->do_code_blob(nm); | |
| 1044 } | |
| 1045 } | |
| 1046 | |
| 1047 size_t HeapRegionRemSet::strong_code_roots_mem_size() { | |
| 1048 return sizeof(GrowableArray<nmethod*>) + | |
| 1049 _strong_code_roots_list->max_length() * sizeof(nmethod*); | |
| 1050 } | |
| 1051 | |
| 342 | 1052 //-------------------- Iteration -------------------- |
| 1053 | |
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1054 HeapRegionRemSetIterator:: HeapRegionRemSetIterator(const HeapRegionRemSet* hrrs) : |
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1055 _hrrs(hrrs), |
| 342 | 1056 _g1h(G1CollectedHeap::heap()), |
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1057 _coarse_map(&hrrs->_other_regions._coarse_map), |
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1058 _fine_grain_regions(hrrs->_other_regions._fine_grain_regions), |
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1059 _bosa(hrrs->bosa()), |
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1060 _is(Sparse), |
| 342 | 1061 // Set these values so that we increment to the first region. |
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1062 _coarse_cur_region_index(-1), |
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1063 _coarse_cur_region_cur_card(HeapRegion::CardsPerRegion-1), |
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1064 _cur_region_cur_card(0), |
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1065 _fine_array_index(-1), |
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1066 _fine_cur_prt(NULL), |
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1067 _n_yielded_coarse(0), |
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1068 _n_yielded_fine(0), |
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1069 _n_yielded_sparse(0), |
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1070 _sparse_iter(&hrrs->_other_regions._sparse_table) {} |
| 342 | 1071 |
| 1072 bool HeapRegionRemSetIterator::coarse_has_next(size_t& card_index) { | |
| 1073 if (_hrrs->_other_regions._n_coarse_entries == 0) return false; | |
| 1074 // Go to the next card. | |
| 1075 _coarse_cur_region_cur_card++; | |
| 1076 // Was the last the last card in the current region? | |
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1077 if (_coarse_cur_region_cur_card == HeapRegion::CardsPerRegion) { |
| 342 | 1078 // Yes: find the next region. This may leave _coarse_cur_region_index |
| 1079 // Set to the last index, in which case there are no more coarse | |
| 1080 // regions. | |
| 1081 _coarse_cur_region_index = | |
| 1082 (int) _coarse_map->get_next_one_offset(_coarse_cur_region_index + 1); | |
| 1083 if ((size_t)_coarse_cur_region_index < _coarse_map->size()) { | |
| 1084 _coarse_cur_region_cur_card = 0; | |
| 1085 HeapWord* r_bot = | |
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1086 _g1h->region_at((uint) _coarse_cur_region_index)->bottom(); |
| 342 | 1087 _cur_region_card_offset = _bosa->index_for(r_bot); |
| 1088 } else { | |
| 1089 return false; | |
| 1090 } | |
| 1091 } | |
| 1092 // If we didn't return false above, then we can yield a card. | |
| 1093 card_index = _cur_region_card_offset + _coarse_cur_region_cur_card; | |
| 1094 return true; | |
| 1095 } | |
| 1096 | |
| 1097 void HeapRegionRemSetIterator::fine_find_next_non_null_prt() { | |
| 1098 // Otherwise, find the next bucket list in the array. | |
| 1099 _fine_array_index++; | |
| 1100 while (_fine_array_index < (int) OtherRegionsTable::_max_fine_entries) { | |
| 1101 _fine_cur_prt = _fine_grain_regions[_fine_array_index]; | |
| 1102 if (_fine_cur_prt != NULL) return; | |
| 1103 else _fine_array_index++; | |
| 1104 } | |
| 1105 assert(_fine_cur_prt == NULL, "Loop post"); | |
| 1106 } | |
| 1107 | |
| 1108 bool HeapRegionRemSetIterator::fine_has_next(size_t& card_index) { | |
| 1109 if (fine_has_next()) { | |
| 1110 _cur_region_cur_card = | |
| 1111 _fine_cur_prt->_bm.get_next_one_offset(_cur_region_cur_card + 1); | |
| 1112 } | |
| 1113 while (!fine_has_next()) { | |
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1114 if (_cur_region_cur_card == (size_t) HeapRegion::CardsPerRegion) { |
| 342 | 1115 _cur_region_cur_card = 0; |
| 6253 | 1116 _fine_cur_prt = _fine_cur_prt->collision_list_next(); |
| 342 | 1117 } |
| 1118 if (_fine_cur_prt == NULL) { | |
| 1119 fine_find_next_non_null_prt(); | |
| 1120 if (_fine_cur_prt == NULL) return false; | |
| 1121 } | |
| 1122 assert(_fine_cur_prt != NULL && _cur_region_cur_card == 0, | |
| 1123 "inv."); | |
| 1124 HeapWord* r_bot = | |
| 1125 _fine_cur_prt->hr()->bottom(); | |
| 1126 _cur_region_card_offset = _bosa->index_for(r_bot); | |
| 1127 _cur_region_cur_card = _fine_cur_prt->_bm.get_next_one_offset(0); | |
| 1128 } | |
| 1129 assert(fine_has_next(), "Or else we exited the loop via the return."); | |
| 1130 card_index = _cur_region_card_offset + _cur_region_cur_card; | |
| 1131 return true; | |
| 1132 } | |
| 1133 | |
| 1134 bool HeapRegionRemSetIterator::fine_has_next() { | |
| 1135 return | |
| 1136 _fine_cur_prt != NULL && | |
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1137 _cur_region_cur_card < HeapRegion::CardsPerRegion; |
| 342 | 1138 } |
| 1139 | |
| 1140 bool HeapRegionRemSetIterator::has_next(size_t& card_index) { | |
| 1141 switch (_is) { | |
| 1142 case Sparse: | |
| 1143 if (_sparse_iter.has_next(card_index)) { | |
| 1144 _n_yielded_sparse++; | |
| 1145 return true; | |
| 1146 } | |
| 1147 // Otherwise, deliberate fall-through | |
| 1148 _is = Fine; | |
| 1149 case Fine: | |
| 1150 if (fine_has_next(card_index)) { | |
| 1151 _n_yielded_fine++; | |
| 1152 return true; | |
| 1153 } | |
| 1154 // Otherwise, deliberate fall-through | |
| 1155 _is = Coarse; | |
| 1156 case Coarse: | |
| 1157 if (coarse_has_next(card_index)) { | |
| 1158 _n_yielded_coarse++; | |
| 1159 return true; | |
| 1160 } | |
| 1161 // Otherwise... | |
| 1162 break; | |
| 1163 } | |
| 1164 assert(ParallelGCThreads > 1 || | |
| 1165 n_yielded() == _hrrs->occupied(), | |
| 1166 "Should have yielded all the cards in the rem set " | |
| 1167 "(in the non-par case)."); | |
| 1168 return false; | |
| 1169 } | |
| 1170 | |
| 1171 | |
| 1172 | |
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1173 OopOrNarrowOopStar* HeapRegionRemSet::_recorded_oops = NULL; |
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1174 HeapWord** HeapRegionRemSet::_recorded_cards = NULL; |
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1175 HeapRegion** HeapRegionRemSet::_recorded_regions = NULL; |
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1176 int HeapRegionRemSet::_n_recorded = 0; |
| 342 | 1177 |
| 1178 HeapRegionRemSet::Event* HeapRegionRemSet::_recorded_events = NULL; | |
| 1179 int* HeapRegionRemSet::_recorded_event_index = NULL; | |
| 1180 int HeapRegionRemSet::_n_recorded_events = 0; | |
| 1181 | |
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1182 void HeapRegionRemSet::record(HeapRegion* hr, OopOrNarrowOopStar f) { |
| 342 | 1183 if (_recorded_oops == NULL) { |
| 1184 assert(_n_recorded == 0 | |
| 1185 && _recorded_cards == NULL | |
| 1186 && _recorded_regions == NULL, | |
| 1187 "Inv"); | |
| 6197 | 1188 _recorded_oops = NEW_C_HEAP_ARRAY(OopOrNarrowOopStar, MaxRecorded, mtGC); |
| 1189 _recorded_cards = NEW_C_HEAP_ARRAY(HeapWord*, MaxRecorded, mtGC); | |
| 1190 _recorded_regions = NEW_C_HEAP_ARRAY(HeapRegion*, MaxRecorded, mtGC); | |
| 342 | 1191 } |
| 1192 if (_n_recorded == MaxRecorded) { | |
| 1193 gclog_or_tty->print_cr("Filled up 'recorded' (%d).", MaxRecorded); | |
| 1194 } else { | |
| 1195 _recorded_cards[_n_recorded] = | |
| 1196 (HeapWord*)align_size_down(uintptr_t(f), | |
| 1197 CardTableModRefBS::card_size); | |
| 1198 _recorded_oops[_n_recorded] = f; | |
| 1199 _recorded_regions[_n_recorded] = hr; | |
| 1200 _n_recorded++; | |
| 1201 } | |
| 1202 } | |
| 1203 | |
| 1204 void HeapRegionRemSet::record_event(Event evnt) { | |
| 1205 if (!G1RecordHRRSEvents) return; | |
| 1206 | |
| 1207 if (_recorded_events == NULL) { | |
| 1208 assert(_n_recorded_events == 0 | |
| 1209 && _recorded_event_index == NULL, | |
| 1210 "Inv"); | |
| 6197 | 1211 _recorded_events = NEW_C_HEAP_ARRAY(Event, MaxRecordedEvents, mtGC); |
| 1212 _recorded_event_index = NEW_C_HEAP_ARRAY(int, MaxRecordedEvents, mtGC); | |
| 342 | 1213 } |
| 1214 if (_n_recorded_events == MaxRecordedEvents) { | |
| 1215 gclog_or_tty->print_cr("Filled up 'recorded_events' (%d).", MaxRecordedEvents); | |
| 1216 } else { | |
| 1217 _recorded_events[_n_recorded_events] = evnt; | |
| 1218 _recorded_event_index[_n_recorded_events] = _n_recorded; | |
| 1219 _n_recorded_events++; | |
| 1220 } | |
| 1221 } | |
| 1222 | |
| 1223 void HeapRegionRemSet::print_event(outputStream* str, Event evnt) { | |
| 1224 switch (evnt) { | |
| 1225 case Event_EvacStart: | |
| 1226 str->print("Evac Start"); | |
| 1227 break; | |
| 1228 case Event_EvacEnd: | |
| 1229 str->print("Evac End"); | |
| 1230 break; | |
| 1231 case Event_RSUpdateEnd: | |
| 1232 str->print("RS Update End"); | |
| 1233 break; | |
| 1234 } | |
| 1235 } | |
| 1236 | |
| 1237 void HeapRegionRemSet::print_recorded() { | |
| 1238 int cur_evnt = 0; | |
| 1239 Event cur_evnt_kind; | |
| 1240 int cur_evnt_ind = 0; | |
| 1241 if (_n_recorded_events > 0) { | |
| 1242 cur_evnt_kind = _recorded_events[cur_evnt]; | |
| 1243 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
| 1244 } | |
| 1245 | |
| 1246 for (int i = 0; i < _n_recorded; i++) { | |
| 1247 while (cur_evnt < _n_recorded_events && i == cur_evnt_ind) { | |
| 1248 gclog_or_tty->print("Event: "); | |
| 1249 print_event(gclog_or_tty, cur_evnt_kind); | |
| 1250 gclog_or_tty->print_cr(""); | |
| 1251 cur_evnt++; | |
| 1252 if (cur_evnt < MaxRecordedEvents) { | |
| 1253 cur_evnt_kind = _recorded_events[cur_evnt]; | |
| 1254 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
| 1255 } | |
| 1256 } | |
| 1257 gclog_or_tty->print("Added card " PTR_FORMAT " to region [" PTR_FORMAT "...]" | |
| 1258 " for ref " PTR_FORMAT ".\n", | |
| 1259 _recorded_cards[i], _recorded_regions[i]->bottom(), | |
| 1260 _recorded_oops[i]); | |
| 1261 } | |
| 1262 } | |
| 1263 | |
| 2173 | 1264 void HeapRegionRemSet::reset_for_cleanup_tasks() { |
| 1265 SparsePRT::reset_for_cleanup_tasks(); | |
| 1266 } | |
| 1267 | |
| 1268 void HeapRegionRemSet::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
| 1269 _other_regions.do_cleanup_work(hrrs_cleanup_task); | |
| 1270 } | |
| 1271 | |
| 1272 void | |
| 1273 HeapRegionRemSet::finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task) { | |
| 1274 SparsePRT::finish_cleanup_task(hrrs_cleanup_task); | |
| 1275 } | |
| 1276 | |
| 342 | 1277 #ifndef PRODUCT |
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1278 void PerRegionTable::test_fl_mem_size() { |
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1279 PerRegionTable* dummy = alloc(NULL); |
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1280 free(dummy); |
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1281 guarantee(dummy->mem_size() == fl_mem_size(), "fl_mem_size() does not return the correct element size"); |
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1282 // try to reset the state |
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1283 _free_list = NULL; |
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1284 delete dummy; |
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1285 } |
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1286 |
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1287 void HeapRegionRemSet::test_prt() { |
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1288 PerRegionTable::test_fl_mem_size(); |
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1289 } |
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1290 |
| 342 | 1291 void HeapRegionRemSet::test() { |
| 1292 os::sleep(Thread::current(), (jlong)5000, false); | |
| 1293 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1294 | |
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1295 // Run with "-XX:G1LogRSetRegionEntries=2", so that 1 and 5 end up in same |
| 342 | 1296 // hash bucket. |
| 1297 HeapRegion* hr0 = g1h->region_at(0); | |
| 1298 HeapRegion* hr1 = g1h->region_at(1); | |
| 1299 HeapRegion* hr2 = g1h->region_at(5); | |
| 1300 HeapRegion* hr3 = g1h->region_at(6); | |
| 1301 HeapRegion* hr4 = g1h->region_at(7); | |
| 1302 HeapRegion* hr5 = g1h->region_at(8); | |
| 1303 | |
| 1304 HeapWord* hr1_start = hr1->bottom(); | |
| 1305 HeapWord* hr1_mid = hr1_start + HeapRegion::GrainWords/2; | |
| 1306 HeapWord* hr1_last = hr1->end() - 1; | |
| 1307 | |
| 1308 HeapWord* hr2_start = hr2->bottom(); | |
| 1309 HeapWord* hr2_mid = hr2_start + HeapRegion::GrainWords/2; | |
| 1310 HeapWord* hr2_last = hr2->end() - 1; | |
| 1311 | |
| 1312 HeapWord* hr3_start = hr3->bottom(); | |
| 1313 HeapWord* hr3_mid = hr3_start + HeapRegion::GrainWords/2; | |
| 1314 HeapWord* hr3_last = hr3->end() - 1; | |
| 1315 | |
| 1316 HeapRegionRemSet* hrrs = hr0->rem_set(); | |
| 1317 | |
| 1318 // Make three references from region 0x101... | |
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1319 hrrs->add_reference((OopOrNarrowOopStar)hr1_start); |
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1320 hrrs->add_reference((OopOrNarrowOopStar)hr1_mid); |
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1321 hrrs->add_reference((OopOrNarrowOopStar)hr1_last); |
| 342 | 1322 |
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1323 hrrs->add_reference((OopOrNarrowOopStar)hr2_start); |
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1324 hrrs->add_reference((OopOrNarrowOopStar)hr2_mid); |
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1325 hrrs->add_reference((OopOrNarrowOopStar)hr2_last); |
| 342 | 1326 |
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1327 hrrs->add_reference((OopOrNarrowOopStar)hr3_start); |
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1328 hrrs->add_reference((OopOrNarrowOopStar)hr3_mid); |
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1329 hrrs->add_reference((OopOrNarrowOopStar)hr3_last); |
| 342 | 1330 |
| 1331 // Now cause a coarsening. | |
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1332 hrrs->add_reference((OopOrNarrowOopStar)hr4->bottom()); |
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1333 hrrs->add_reference((OopOrNarrowOopStar)hr5->bottom()); |
| 342 | 1334 |
| 1335 // Now, does iteration yield these three? | |
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1336 HeapRegionRemSetIterator iter(hrrs); |
| 342 | 1337 size_t sum = 0; |
| 1338 size_t card_index; | |
| 1339 while (iter.has_next(card_index)) { | |
| 1340 HeapWord* card_start = | |
| 1341 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
| 1342 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); | |
| 1343 sum++; | |
| 1344 } | |
| 1345 guarantee(sum == 11 - 3 + 2048, "Failure"); | |
| 1346 guarantee(sum == hrrs->occupied(), "Failure"); | |
| 1347 } | |
| 1348 #endif |