Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp @ 24234:ea6f94ab283b default tip
Added tag jvmci-0.36 for changeset 8128b98d4736
| author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
|---|---|
| date | Mon, 18 Sep 2017 18:49:45 +0200 |
| parents | f13e777eb255 |
| children |
| rev | line source |
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| 342 | 1 /* |
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2 * Copyright (c) 2001, 2016, 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" | |
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30 #include "gc_implementation/g1/heapRegionManager.inline.hpp" |
| 1972 | 31 #include "memory/allocation.hpp" |
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32 #include "memory/padded.inline.hpp" |
| 1972 | 33 #include "memory/space.inline.hpp" |
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34 #include "oops/oop.inline.hpp" |
| 1972 | 35 #include "utilities/bitMap.inline.hpp" |
| 36 #include "utilities/globalDefinitions.hpp" | |
| 12080 | 37 #include "utilities/growableArray.hpp" |
| 342 | 38 |
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39 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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40 |
| 6197 | 41 class PerRegionTable: public CHeapObj<mtGC> { |
| 342 | 42 friend class OtherRegionsTable; |
| 43 friend class HeapRegionRemSetIterator; | |
| 44 | |
| 45 HeapRegion* _hr; | |
| 46 BitMap _bm; | |
| 47 jint _occupied; | |
| 48 | |
| 6253 | 49 // next pointer for free/allocated 'all' list |
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50 PerRegionTable* _next; |
| 342 | 51 |
| 6253 | 52 // prev pointer for the allocated 'all' list |
| 53 PerRegionTable* _prev; | |
| 342 | 54 |
| 6253 | 55 // next pointer in collision list |
| 56 PerRegionTable * _collision_list_next; | |
| 342 | 57 |
| 6253 | 58 // Global free list of PRTs |
| 59 static PerRegionTable* _free_list; | |
| 342 | 60 |
| 61 protected: | |
| 62 // We need access in order to union things into the base table. | |
| 63 BitMap* bm() { return &_bm; } | |
| 64 | |
| 65 void recount_occupied() { | |
| 66 _occupied = (jint) bm()->count_one_bits(); | |
| 67 } | |
| 68 | |
| 69 PerRegionTable(HeapRegion* hr) : | |
| 70 _hr(hr), | |
| 71 _occupied(0), | |
| 6253 | 72 _bm(HeapRegion::CardsPerRegion, false /* in-resource-area */), |
| 73 _collision_list_next(NULL), _next(NULL), _prev(NULL) | |
| 342 | 74 {} |
| 75 | |
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76 void add_card_work(CardIdx_t from_card, bool par) { |
| 342 | 77 if (!_bm.at(from_card)) { |
| 78 if (par) { | |
| 79 if (_bm.par_at_put(from_card, 1)) { | |
| 80 Atomic::inc(&_occupied); | |
| 81 } | |
| 82 } else { | |
| 83 _bm.at_put(from_card, 1); | |
| 84 _occupied++; | |
| 85 } | |
| 86 } | |
| 87 } | |
| 88 | |
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89 void add_reference_work(OopOrNarrowOopStar from, bool par) { |
| 342 | 90 // Must make this robust in case "from" is not in "_hr", because of |
| 91 // concurrency. | |
| 92 | |
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93 if (G1TraceHeapRegionRememberedSet) { |
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94 gclog_or_tty->print_cr(" PRT::Add_reference_work(" PTR_FORMAT "->" PTR_FORMAT").", |
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95 from, |
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96 UseCompressedOops |
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97 ? (void *)oopDesc::load_decode_heap_oop((narrowOop*)from) |
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98 : (void *)oopDesc::load_decode_heap_oop((oop*)from)); |
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99 } |
| 342 | 100 |
| 101 HeapRegion* loc_hr = hr(); | |
| 102 // If the test below fails, then this table was reused concurrently | |
| 103 // with this operation. This is OK, since the old table was coarsened, | |
| 104 // and adding a bit to the new table is never incorrect. | |
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105 // If the table used to belong to a continues humongous region and is |
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106 // now reused for the corresponding start humongous region, we need to |
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107 // make sure that we detect this. Thus, we call is_in_reserved_raw() |
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108 // instead of just is_in_reserved() here. |
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109 if (loc_hr->is_in_reserved_raw(from)) { |
| 342 | 110 size_t hw_offset = pointer_delta((HeapWord*)from, loc_hr->bottom()); |
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111 CardIdx_t from_card = (CardIdx_t) |
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112 hw_offset >> (CardTableModRefBS::card_shift - LogHeapWordSize); |
| 342 | 113 |
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114 assert(0 <= from_card && (size_t)from_card < HeapRegion::CardsPerRegion, |
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115 "Must be in range."); |
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116 add_card_work(from_card, par); |
| 342 | 117 } |
| 118 } | |
| 119 | |
| 120 public: | |
| 121 | |
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122 HeapRegion* hr() const { |
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123 return (HeapRegion*) OrderAccess::load_ptr_acquire(&_hr); |
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124 } |
| 342 | 125 |
| 126 jint occupied() const { | |
| 127 // Overkill, but if we ever need it... | |
| 128 // guarantee(_occupied == _bm.count_one_bits(), "Check"); | |
| 129 return _occupied; | |
| 130 } | |
| 131 | |
| 6253 | 132 void init(HeapRegion* hr, bool clear_links_to_all_list) { |
| 133 if (clear_links_to_all_list) { | |
| 134 set_next(NULL); | |
| 135 set_prev(NULL); | |
| 136 } | |
| 137 _collision_list_next = NULL; | |
| 342 | 138 _occupied = 0; |
| 139 _bm.clear(); | |
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140 // Make sure that the bitmap clearing above has been finished before publishing |
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141 // this PRT to concurrent threads. |
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142 OrderAccess::release_store_ptr(&_hr, hr); |
| 342 | 143 } |
| 144 | |
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145 void add_reference(OopOrNarrowOopStar from) { |
| 342 | 146 add_reference_work(from, /*parallel*/ true); |
| 147 } | |
| 148 | |
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149 void seq_add_reference(OopOrNarrowOopStar from) { |
| 342 | 150 add_reference_work(from, /*parallel*/ false); |
| 151 } | |
| 152 | |
| 153 void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { | |
| 154 HeapWord* hr_bot = hr()->bottom(); | |
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155 size_t hr_first_card_index = ctbs->index_for(hr_bot); |
| 342 | 156 bm()->set_intersection_at_offset(*card_bm, hr_first_card_index); |
| 157 recount_occupied(); | |
| 158 } | |
| 159 | |
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160 void add_card(CardIdx_t from_card_index) { |
| 342 | 161 add_card_work(from_card_index, /*parallel*/ true); |
| 162 } | |
| 163 | |
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164 void seq_add_card(CardIdx_t from_card_index) { |
| 342 | 165 add_card_work(from_card_index, /*parallel*/ false); |
| 166 } | |
| 167 | |
| 168 // (Destructively) union the bitmap of the current table into the given | |
| 169 // bitmap (which is assumed to be of the same size.) | |
| 170 void union_bitmap_into(BitMap* bm) { | |
| 171 bm->set_union(_bm); | |
| 172 } | |
| 173 | |
| 174 // Mem size in bytes. | |
| 175 size_t mem_size() const { | |
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176 return sizeof(PerRegionTable) + _bm.size_in_words() * HeapWordSize; |
| 342 | 177 } |
| 178 | |
| 179 // Requires "from" to be in "hr()". | |
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180 bool contains_reference(OopOrNarrowOopStar from) const { |
| 342 | 181 assert(hr()->is_in_reserved(from), "Precondition."); |
| 182 size_t card_ind = pointer_delta(from, hr()->bottom(), | |
| 183 CardTableModRefBS::card_size); | |
| 184 return _bm.at(card_ind); | |
| 185 } | |
| 186 | |
| 6253 | 187 // Bulk-free the PRTs from prt to last, assumes that they are |
| 188 // linked together using their _next field. | |
| 189 static void bulk_free(PerRegionTable* prt, PerRegionTable* last) { | |
| 342 | 190 while (true) { |
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191 PerRegionTable* fl = _free_list; |
| 6253 | 192 last->set_next(fl); |
| 193 PerRegionTable* res = (PerRegionTable*) Atomic::cmpxchg_ptr(prt, &_free_list, fl); | |
| 194 if (res == fl) { | |
| 195 return; | |
| 196 } | |
| 342 | 197 } |
| 198 ShouldNotReachHere(); | |
| 199 } | |
| 200 | |
| 6253 | 201 static void free(PerRegionTable* prt) { |
| 202 bulk_free(prt, prt); | |
| 203 } | |
| 204 | |
| 205 // Returns an initialized PerRegionTable instance. | |
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206 static PerRegionTable* alloc(HeapRegion* hr) { |
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207 PerRegionTable* fl = _free_list; |
| 342 | 208 while (fl != NULL) { |
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209 PerRegionTable* nxt = fl->next(); |
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210 PerRegionTable* res = |
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211 (PerRegionTable*) |
| 342 | 212 Atomic::cmpxchg_ptr(nxt, &_free_list, fl); |
| 213 if (res == fl) { | |
| 6253 | 214 fl->init(hr, true); |
| 342 | 215 return fl; |
| 216 } else { | |
| 217 fl = _free_list; | |
| 218 } | |
| 219 } | |
| 220 assert(fl == NULL, "Loop condition."); | |
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221 return new PerRegionTable(hr); |
| 342 | 222 } |
| 223 | |
| 6253 | 224 PerRegionTable* next() const { return _next; } |
| 225 void set_next(PerRegionTable* next) { _next = next; } | |
| 226 PerRegionTable* prev() const { return _prev; } | |
| 227 void set_prev(PerRegionTable* prev) { _prev = prev; } | |
| 228 | |
| 229 // Accessor and Modification routines for the pointer for the | |
| 230 // singly linked collision list that links the PRTs within the | |
| 231 // OtherRegionsTable::_fine_grain_regions hash table. | |
| 232 // | |
| 233 // It might be useful to also make the collision list doubly linked | |
| 234 // to avoid iteration over the collisions list during scrubbing/deletion. | |
| 235 // OTOH there might not be many collisions. | |
| 236 | |
| 237 PerRegionTable* collision_list_next() const { | |
| 238 return _collision_list_next; | |
| 239 } | |
| 240 | |
| 241 void set_collision_list_next(PerRegionTable* next) { | |
| 242 _collision_list_next = next; | |
| 243 } | |
| 244 | |
| 245 PerRegionTable** collision_list_next_addr() { | |
| 246 return &_collision_list_next; | |
| 247 } | |
| 248 | |
| 342 | 249 static size_t fl_mem_size() { |
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250 PerRegionTable* cur = _free_list; |
| 342 | 251 size_t res = 0; |
| 252 while (cur != NULL) { | |
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253 res += cur->mem_size(); |
| 342 | 254 cur = cur->next(); |
| 255 } | |
| 256 return res; | |
| 257 } | |
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258 |
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259 static void test_fl_mem_size(); |
| 342 | 260 }; |
| 261 | |
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262 PerRegionTable* PerRegionTable::_free_list = NULL; |
| 342 | 263 |
| 264 size_t OtherRegionsTable::_max_fine_entries = 0; | |
| 265 size_t OtherRegionsTable::_mod_max_fine_entries_mask = 0; | |
| 266 size_t OtherRegionsTable::_fine_eviction_stride = 0; | |
| 267 size_t OtherRegionsTable::_fine_eviction_sample_size = 0; | |
| 268 | |
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269 OtherRegionsTable::OtherRegionsTable(HeapRegion* hr, Mutex* m) : |
| 342 | 270 _g1h(G1CollectedHeap::heap()), |
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271 _hr(hr), _m(m), |
| 342 | 272 _coarse_map(G1CollectedHeap::heap()->max_regions(), |
| 273 false /* in-resource-area */), | |
| 274 _fine_grain_regions(NULL), | |
| 6253 | 275 _first_all_fine_prts(NULL), _last_all_fine_prts(NULL), |
| 342 | 276 _n_fine_entries(0), _n_coarse_entries(0), |
| 277 _fine_eviction_start(0), | |
| 278 _sparse_table(hr) | |
| 279 { | |
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280 typedef PerRegionTable* PerRegionTablePtr; |
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281 |
| 342 | 282 if (_max_fine_entries == 0) { |
| 283 assert(_mod_max_fine_entries_mask == 0, "Both or none."); | |
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284 size_t max_entries_log = (size_t)log2_long((jlong)G1RSetRegionEntries); |
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285 _max_fine_entries = (size_t)1 << max_entries_log; |
| 342 | 286 _mod_max_fine_entries_mask = _max_fine_entries - 1; |
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287 |
| 342 | 288 assert(_fine_eviction_sample_size == 0 |
| 289 && _fine_eviction_stride == 0, "All init at same time."); | |
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290 _fine_eviction_sample_size = MAX2((size_t)4, max_entries_log); |
| 342 | 291 _fine_eviction_stride = _max_fine_entries / _fine_eviction_sample_size; |
| 292 } | |
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293 |
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294 _fine_grain_regions = NEW_C_HEAP_ARRAY3(PerRegionTablePtr, _max_fine_entries, |
| 20360 | 295 mtGC, CURRENT_PC, AllocFailStrategy::RETURN_NULL); |
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296 |
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297 if (_fine_grain_regions == NULL) { |
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298 vm_exit_out_of_memory(sizeof(void*)*_max_fine_entries, OOM_MALLOC_ERROR, |
| 342 | 299 "Failed to allocate _fine_grain_entries."); |
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300 } |
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301 |
| 342 | 302 for (size_t i = 0; i < _max_fine_entries; i++) { |
| 303 _fine_grain_regions[i] = NULL; | |
| 304 } | |
| 305 } | |
| 306 | |
| 6253 | 307 void OtherRegionsTable::link_to_all(PerRegionTable* prt) { |
| 308 // We always append to the beginning of the list for convenience; | |
| 309 // the order of entries in this list does not matter. | |
| 310 if (_first_all_fine_prts != NULL) { | |
| 311 assert(_first_all_fine_prts->prev() == NULL, "invariant"); | |
| 312 _first_all_fine_prts->set_prev(prt); | |
| 313 prt->set_next(_first_all_fine_prts); | |
| 314 } else { | |
| 315 // this is the first element we insert. Adjust the "last" pointer | |
| 316 _last_all_fine_prts = prt; | |
| 317 assert(prt->next() == NULL, "just checking"); | |
| 318 } | |
| 319 // the new element is always the first element without a predecessor | |
| 320 prt->set_prev(NULL); | |
| 321 _first_all_fine_prts = prt; | |
| 322 | |
| 323 assert(prt->prev() == NULL, "just checking"); | |
| 324 assert(_first_all_fine_prts == prt, "just checking"); | |
| 325 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || | |
| 326 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), | |
| 327 "just checking"); | |
| 328 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, | |
| 329 "just checking"); | |
| 330 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, | |
| 331 "just checking"); | |
| 332 } | |
| 333 | |
| 334 void OtherRegionsTable::unlink_from_all(PerRegionTable* prt) { | |
| 335 if (prt->prev() != NULL) { | |
| 336 assert(_first_all_fine_prts != prt, "just checking"); | |
| 337 prt->prev()->set_next(prt->next()); | |
| 338 // removing the last element in the list? | |
| 339 if (_last_all_fine_prts == prt) { | |
| 340 _last_all_fine_prts = prt->prev(); | |
| 341 } | |
| 342 } else { | |
| 343 assert(_first_all_fine_prts == prt, "just checking"); | |
| 344 _first_all_fine_prts = prt->next(); | |
| 345 // list is empty now? | |
| 346 if (_first_all_fine_prts == NULL) { | |
| 347 _last_all_fine_prts = NULL; | |
| 348 } | |
| 349 } | |
| 350 | |
| 351 if (prt->next() != NULL) { | |
| 352 prt->next()->set_prev(prt->prev()); | |
| 353 } | |
| 354 | |
| 355 prt->set_next(NULL); | |
| 356 prt->set_prev(NULL); | |
| 357 | |
| 358 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || | |
| 359 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), | |
| 360 "just checking"); | |
| 361 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, | |
| 362 "just checking"); | |
| 363 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, | |
| 364 "just checking"); | |
| 365 } | |
| 366 | |
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367 int** FromCardCache::_cache = NULL; |
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368 uint FromCardCache::_max_regions = 0; |
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369 size_t FromCardCache::_static_mem_size = 0; |
| 342 | 370 |
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371 void FromCardCache::initialize(uint n_par_rs, uint max_num_regions) { |
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372 guarantee(_cache == NULL, "Should not call this multiple times"); |
| 342 | 373 |
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374 _max_regions = max_num_regions; |
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375 _cache = Padded2DArray<int, mtGC>::create_unfreeable(n_par_rs, |
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376 _max_regions, |
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377 &_static_mem_size); |
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378 |
| 20337 | 379 invalidate(0, _max_regions); |
| 342 | 380 } |
| 381 | |
| 20337 | 382 void FromCardCache::invalidate(uint start_idx, size_t new_num_regions) { |
| 383 guarantee((size_t)start_idx + new_num_regions <= max_uintx, | |
| 384 err_msg("Trying to invalidate beyond maximum region, from %u size "SIZE_FORMAT, | |
| 385 start_idx, new_num_regions)); | |
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386 for (uint i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { |
| 20337 | 387 uint end_idx = (start_idx + (uint)new_num_regions); |
| 388 assert(end_idx <= _max_regions, "Must be within max."); | |
| 389 for (uint j = start_idx; j < end_idx; j++) { | |
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390 set(i, j, InvalidCard); |
| 342 | 391 } |
| 392 } | |
| 393 } | |
| 394 | |
| 395 #ifndef PRODUCT | |
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396 void FromCardCache::print(outputStream* out) { |
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397 for (uint i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { |
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398 for (uint j = 0; j < _max_regions; j++) { |
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399 out->print_cr("_from_card_cache["UINT32_FORMAT"]["UINT32_FORMAT"] = "INT32_FORMAT".", |
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400 i, j, at(i, j)); |
| 342 | 401 } |
| 402 } | |
| 403 } | |
| 404 #endif | |
| 405 | |
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406 void FromCardCache::clear(uint region_idx) { |
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407 uint num_par_remsets = HeapRegionRemSet::num_par_rem_sets(); |
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408 for (uint i = 0; i < num_par_remsets; i++) { |
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409 set(i, region_idx, InvalidCard); |
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410 } |
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411 } |
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412 |
| 20337 | 413 void OtherRegionsTable::initialize(uint max_regions) { |
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414 FromCardCache::initialize(HeapRegionRemSet::num_par_rem_sets(), max_regions); |
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415 } |
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416 |
| 20337 | 417 void OtherRegionsTable::invalidate(uint start_idx, size_t num_regions) { |
| 418 FromCardCache::invalidate(start_idx, num_regions); | |
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419 } |
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420 |
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421 void OtherRegionsTable::print_from_card_cache() { |
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422 FromCardCache::print(); |
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423 } |
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424 |
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425 void OtherRegionsTable::add_reference(OopOrNarrowOopStar from, int tid) { |
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426 uint cur_hrm_ind = hr()->hrm_index(); |
| 342 | 427 |
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428 if (G1TraceHeapRegionRememberedSet) { |
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429 gclog_or_tty->print_cr("ORT::add_reference_work(" PTR_FORMAT "->" PTR_FORMAT ").", |
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430 from, |
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431 UseCompressedOops |
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432 ? (void *)oopDesc::load_decode_heap_oop((narrowOop*)from) |
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433 : (void *)oopDesc::load_decode_heap_oop((oop*)from)); |
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434 } |
| 342 | 435 |
| 436 int from_card = (int)(uintptr_t(from) >> CardTableModRefBS::card_shift); | |
| 437 | |
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438 if (G1TraceHeapRegionRememberedSet) { |
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439 gclog_or_tty->print_cr("Table for [" PTR_FORMAT "...): card %d (cache = "INT32_FORMAT")", |
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440 hr()->bottom(), from_card, |
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441 FromCardCache::at((uint)tid, cur_hrm_ind)); |
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442 } |
| 342 | 443 |
|
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444 if (FromCardCache::contains_or_replace((uint)tid, cur_hrm_ind, from_card)) { |
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445 if (G1TraceHeapRegionRememberedSet) { |
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446 gclog_or_tty->print_cr(" from-card cache hit."); |
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447 } |
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448 assert(contains_reference(from), err_msg("We just found " PTR_FORMAT " in the FromCardCache", from)); |
| 342 | 449 return; |
| 450 } | |
| 451 | |
| 452 // Note that this may be a continued H region. | |
| 453 HeapRegion* from_hr = _g1h->heap_region_containing_raw(from); | |
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454 RegionIdx_t from_hrm_ind = (RegionIdx_t) from_hr->hrm_index(); |
| 342 | 455 |
| 456 // If the region is already coarsened, return. | |
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457 if (_coarse_map.at(from_hrm_ind)) { |
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458 if (G1TraceHeapRegionRememberedSet) { |
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459 gclog_or_tty->print_cr(" coarse map hit."); |
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460 } |
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461 assert(contains_reference(from), err_msg("We just found " PTR_FORMAT " in the Coarse table", from)); |
| 342 | 462 return; |
| 463 } | |
| 464 | |
| 465 // Otherwise find a per-region table to add it to. | |
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466 size_t ind = from_hrm_ind & _mod_max_fine_entries_mask; |
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467 PerRegionTable* prt = find_region_table(ind, from_hr); |
| 342 | 468 if (prt == NULL) { |
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469 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); |
| 342 | 470 // Confirm that it's really not there... |
| 471 prt = find_region_table(ind, from_hr); | |
| 472 if (prt == NULL) { | |
| 473 | |
| 474 uintptr_t from_hr_bot_card_index = | |
| 475 uintptr_t(from_hr->bottom()) | |
| 476 >> CardTableModRefBS::card_shift; | |
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477 CardIdx_t card_index = from_card - from_hr_bot_card_index; |
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478 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
| 342 | 479 "Must be in range."); |
| 480 if (G1HRRSUseSparseTable && | |
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481 _sparse_table.add_card(from_hrm_ind, card_index)) { |
| 342 | 482 if (G1RecordHRRSOops) { |
| 483 HeapRegionRemSet::record(hr(), from); | |
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484 if (G1TraceHeapRegionRememberedSet) { |
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485 gclog_or_tty->print(" Added card " PTR_FORMAT " to region " |
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486 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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487 align_size_down(uintptr_t(from), |
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488 CardTableModRefBS::card_size), |
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489 hr()->bottom(), from); |
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490 } |
| 342 | 491 } |
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492 if (G1TraceHeapRegionRememberedSet) { |
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493 gclog_or_tty->print_cr(" added card to sparse table."); |
|
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494 } |
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495 assert(contains_reference_locked(from), err_msg("We just added " PTR_FORMAT " to the Sparse table", from)); |
| 342 | 496 return; |
| 497 } else { | |
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498 if (G1TraceHeapRegionRememberedSet) { |
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499 gclog_or_tty->print_cr(" [tid %d] sparse table entry " |
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500 "overflow(f: %d, t: %u)", |
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501 tid, from_hrm_ind, cur_hrm_ind); |
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502 } |
| 342 | 503 } |
| 504 | |
| 505 if (_n_fine_entries == _max_fine_entries) { | |
| 506 prt = delete_region_table(); | |
| 6253 | 507 // There is no need to clear the links to the 'all' list here: |
| 508 // prt will be reused immediately, i.e. remain in the 'all' list. | |
| 509 prt->init(from_hr, false /* clear_links_to_all_list */); | |
| 342 | 510 } else { |
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511 prt = PerRegionTable::alloc(from_hr); |
| 6253 | 512 link_to_all(prt); |
| 342 | 513 } |
| 514 | |
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515 PerRegionTable* first_prt = _fine_grain_regions[ind]; |
| 6253 | 516 prt->set_collision_list_next(first_prt); |
| 342 | 517 _fine_grain_regions[ind] = prt; |
| 518 _n_fine_entries++; | |
| 519 | |
| 520 if (G1HRRSUseSparseTable) { | |
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521 // Transfer from sparse to fine-grain. |
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522 SparsePRTEntry *sprt_entry = _sparse_table.get_entry(from_hrm_ind); |
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523 assert(sprt_entry != NULL, "There should have been an entry"); |
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524 for (int i = 0; i < SparsePRTEntry::cards_num(); i++) { |
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525 CardIdx_t c = sprt_entry->card(i); |
| 342 | 526 if (c != SparsePRTEntry::NullEntry) { |
| 527 prt->add_card(c); | |
| 528 } | |
| 529 } | |
| 530 // Now we can delete the sparse entry. | |
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531 bool res = _sparse_table.delete_entry(from_hrm_ind); |
| 342 | 532 assert(res, "It should have been there."); |
| 533 } | |
| 534 } | |
| 535 assert(prt != NULL && prt->hr() == from_hr, "consequence"); | |
| 536 } | |
| 537 // Note that we can't assert "prt->hr() == from_hr", because of the | |
| 538 // possibility of concurrent reuse. But see head comment of | |
| 539 // OtherRegionsTable for why this is OK. | |
| 540 assert(prt != NULL, "Inv"); | |
| 541 | |
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542 prt->add_reference(from); |
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543 |
| 342 | 544 if (G1RecordHRRSOops) { |
| 545 HeapRegionRemSet::record(hr(), from); | |
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546 if (G1TraceHeapRegionRememberedSet) { |
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547 gclog_or_tty->print("Added card " PTR_FORMAT " to region " |
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548 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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549 align_size_down(uintptr_t(from), |
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550 CardTableModRefBS::card_size), |
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551 hr()->bottom(), from); |
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552 } |
| 342 | 553 } |
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554 assert(contains_reference(from), err_msg("We just added " PTR_FORMAT " to the PRT", from)); |
| 342 | 555 } |
| 556 | |
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557 PerRegionTable* |
| 342 | 558 OtherRegionsTable::find_region_table(size_t ind, HeapRegion* hr) const { |
| 559 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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560 PerRegionTable* prt = _fine_grain_regions[ind]; |
| 342 | 561 while (prt != NULL && prt->hr() != hr) { |
| 6253 | 562 prt = prt->collision_list_next(); |
| 342 | 563 } |
| 564 // Loop postcondition is the method postcondition. | |
| 565 return prt; | |
| 566 } | |
| 567 | |
| 568 jint OtherRegionsTable::_n_coarsenings = 0; | |
| 569 | |
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570 PerRegionTable* OtherRegionsTable::delete_region_table() { |
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571 assert(_m->owned_by_self(), "Precondition"); |
| 342 | 572 assert(_n_fine_entries == _max_fine_entries, "Precondition"); |
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573 PerRegionTable* max = NULL; |
| 342 | 574 jint max_occ = 0; |
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575 PerRegionTable** max_prev = NULL; |
| 342 | 576 size_t max_ind; |
| 577 | |
| 578 size_t i = _fine_eviction_start; | |
| 579 for (size_t k = 0; k < _fine_eviction_sample_size; k++) { | |
| 580 size_t ii = i; | |
| 581 // Make sure we get a non-NULL sample. | |
| 582 while (_fine_grain_regions[ii] == NULL) { | |
| 583 ii++; | |
| 584 if (ii == _max_fine_entries) ii = 0; | |
| 585 guarantee(ii != i, "We must find one."); | |
| 586 } | |
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587 PerRegionTable** prev = &_fine_grain_regions[ii]; |
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588 PerRegionTable* cur = *prev; |
| 342 | 589 while (cur != NULL) { |
| 590 jint cur_occ = cur->occupied(); | |
| 591 if (max == NULL || cur_occ > max_occ) { | |
| 592 max = cur; | |
| 593 max_prev = prev; | |
| 594 max_ind = i; | |
| 595 max_occ = cur_occ; | |
| 596 } | |
| 6253 | 597 prev = cur->collision_list_next_addr(); |
| 598 cur = cur->collision_list_next(); | |
| 342 | 599 } |
| 600 i = i + _fine_eviction_stride; | |
| 601 if (i >= _n_fine_entries) i = i - _n_fine_entries; | |
| 602 } | |
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603 |
| 342 | 604 _fine_eviction_start++; |
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605 |
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606 if (_fine_eviction_start >= _n_fine_entries) { |
| 342 | 607 _fine_eviction_start -= _n_fine_entries; |
| 608 } | |
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609 |
| 342 | 610 guarantee(max != NULL, "Since _n_fine_entries > 0"); |
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611 guarantee(max_prev != NULL, "Since max != NULL."); |
| 342 | 612 |
| 613 // Set the corresponding coarse bit. | |
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614 size_t max_hrm_index = (size_t) max->hr()->hrm_index(); |
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615 if (!_coarse_map.at(max_hrm_index)) { |
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616 _coarse_map.at_put(max_hrm_index, true); |
| 342 | 617 _n_coarse_entries++; |
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618 if (G1TraceHeapRegionRememberedSet) { |
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619 gclog_or_tty->print("Coarsened entry in region [" PTR_FORMAT "...] " |
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620 "for region [" PTR_FORMAT "...] (%d coarse entries).\n", |
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621 hr()->bottom(), |
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622 max->hr()->bottom(), |
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623 _n_coarse_entries); |
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624 } |
| 342 | 625 } |
| 626 | |
| 627 // Unsplice. | |
| 6253 | 628 *max_prev = max->collision_list_next(); |
| 342 | 629 Atomic::inc(&_n_coarsenings); |
| 630 _n_fine_entries--; | |
| 631 return max; | |
| 632 } | |
| 633 | |
| 634 | |
| 635 // At present, this must be called stop-world single-threaded. | |
| 636 void OtherRegionsTable::scrub(CardTableModRefBS* ctbs, | |
| 637 BitMap* region_bm, BitMap* card_bm) { | |
| 638 // First eliminated garbage regions from the coarse map. | |
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639 if (G1RSScrubVerbose) { |
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640 gclog_or_tty->print_cr("Scrubbing region %u:", hr()->hrm_index()); |
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641 } |
| 342 | 642 |
| 643 assert(_coarse_map.size() == region_bm->size(), "Precondition"); | |
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644 if (G1RSScrubVerbose) { |
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645 gclog_or_tty->print(" Coarse map: before = "SIZE_FORMAT"...", |
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646 _n_coarse_entries); |
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647 } |
| 342 | 648 _coarse_map.set_intersection(*region_bm); |
| 649 _n_coarse_entries = _coarse_map.count_one_bits(); | |
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650 if (G1RSScrubVerbose) { |
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651 gclog_or_tty->print_cr(" after = "SIZE_FORMAT".", _n_coarse_entries); |
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652 } |
| 342 | 653 |
| 654 // Now do the fine-grained maps. | |
| 655 for (size_t i = 0; i < _max_fine_entries; i++) { | |
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656 PerRegionTable* cur = _fine_grain_regions[i]; |
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657 PerRegionTable** prev = &_fine_grain_regions[i]; |
| 342 | 658 while (cur != NULL) { |
| 6253 | 659 PerRegionTable* nxt = cur->collision_list_next(); |
| 342 | 660 // If the entire region is dead, eliminate. |
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661 if (G1RSScrubVerbose) { |
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662 gclog_or_tty->print_cr(" For other region %u:", |
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663 cur->hr()->hrm_index()); |
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664 } |
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665 if (!region_bm->at((size_t) cur->hr()->hrm_index())) { |
| 342 | 666 *prev = nxt; |
| 6253 | 667 cur->set_collision_list_next(NULL); |
| 342 | 668 _n_fine_entries--; |
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669 if (G1RSScrubVerbose) { |
| 342 | 670 gclog_or_tty->print_cr(" deleted via region map."); |
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671 } |
| 6253 | 672 unlink_from_all(cur); |
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673 PerRegionTable::free(cur); |
| 342 | 674 } else { |
| 675 // Do fine-grain elimination. | |
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676 if (G1RSScrubVerbose) { |
| 342 | 677 gclog_or_tty->print(" occ: before = %4d.", cur->occupied()); |
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678 } |
| 342 | 679 cur->scrub(ctbs, card_bm); |
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680 if (G1RSScrubVerbose) { |
| 342 | 681 gclog_or_tty->print_cr(" after = %4d.", cur->occupied()); |
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682 } |
| 342 | 683 // Did that empty the table completely? |
| 684 if (cur->occupied() == 0) { | |
| 685 *prev = nxt; | |
| 6253 | 686 cur->set_collision_list_next(NULL); |
| 342 | 687 _n_fine_entries--; |
| 6253 | 688 unlink_from_all(cur); |
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689 PerRegionTable::free(cur); |
| 342 | 690 } else { |
| 6253 | 691 prev = cur->collision_list_next_addr(); |
| 342 | 692 } |
| 693 } | |
| 694 cur = nxt; | |
| 695 } | |
| 696 } | |
| 697 // Since we may have deleted a from_card_cache entry from the RS, clear | |
| 698 // the FCC. | |
| 699 clear_fcc(); | |
| 700 } | |
| 701 | |
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702 bool OtherRegionsTable::occupancy_less_or_equal_than(size_t limit) const { |
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703 if (limit <= (size_t)G1RSetSparseRegionEntries) { |
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704 return occ_coarse() == 0 && _first_all_fine_prts == NULL && occ_sparse() <= limit; |
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705 } else { |
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706 // Current uses of this method may only use values less than G1RSetSparseRegionEntries |
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707 // for the limit. The solution, comparing against occupied() would be too slow |
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708 // at this time. |
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709 Unimplemented(); |
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710 return false; |
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711 } |
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712 } |
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713 |
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714 bool OtherRegionsTable::is_empty() const { |
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715 return occ_sparse() == 0 && occ_coarse() == 0 && _first_all_fine_prts == NULL; |
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716 } |
| 342 | 717 |
| 718 size_t OtherRegionsTable::occupied() const { | |
| 719 size_t sum = occ_fine(); | |
| 720 sum += occ_sparse(); | |
| 721 sum += occ_coarse(); | |
| 722 return sum; | |
| 723 } | |
| 724 | |
| 725 size_t OtherRegionsTable::occ_fine() const { | |
| 726 size_t sum = 0; | |
| 6253 | 727 |
| 728 size_t num = 0; | |
| 729 PerRegionTable * cur = _first_all_fine_prts; | |
| 730 while (cur != NULL) { | |
| 731 sum += cur->occupied(); | |
| 732 cur = cur->next(); | |
| 733 num++; | |
| 342 | 734 } |
| 6253 | 735 guarantee(num == _n_fine_entries, "just checking"); |
| 342 | 736 return sum; |
| 737 } | |
| 738 | |
| 739 size_t OtherRegionsTable::occ_coarse() const { | |
|
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740 return (_n_coarse_entries * HeapRegion::CardsPerRegion); |
| 342 | 741 } |
| 742 | |
| 743 size_t OtherRegionsTable::occ_sparse() const { | |
| 744 return _sparse_table.occupied(); | |
| 745 } | |
| 746 | |
| 747 size_t OtherRegionsTable::mem_size() const { | |
| 748 size_t sum = 0; | |
|
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749 // all PRTs are of the same size so it is sufficient to query only one of them. |
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750 if (_first_all_fine_prts != NULL) { |
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751 assert(_last_all_fine_prts != NULL && |
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752 _first_all_fine_prts->mem_size() == _last_all_fine_prts->mem_size(), "check that mem_size() is constant"); |
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753 sum += _first_all_fine_prts->mem_size() * _n_fine_entries; |
| 342 | 754 } |
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755 sum += (sizeof(PerRegionTable*) * _max_fine_entries); |
| 342 | 756 sum += (_coarse_map.size_in_words() * HeapWordSize); |
| 757 sum += (_sparse_table.mem_size()); | |
|
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758 sum += sizeof(OtherRegionsTable) - sizeof(_sparse_table); // Avoid double counting above. |
| 342 | 759 return sum; |
| 760 } | |
| 761 | |
| 762 size_t OtherRegionsTable::static_mem_size() { | |
|
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763 return FromCardCache::static_mem_size(); |
| 342 | 764 } |
| 765 | |
| 766 size_t OtherRegionsTable::fl_mem_size() { | |
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767 return PerRegionTable::fl_mem_size(); |
| 342 | 768 } |
| 769 | |
| 770 void OtherRegionsTable::clear_fcc() { | |
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771 FromCardCache::clear(hr()->hrm_index()); |
| 342 | 772 } |
| 773 | |
| 774 void OtherRegionsTable::clear() { | |
| 6253 | 775 // if there are no entries, skip this step |
| 776 if (_first_all_fine_prts != NULL) { | |
| 777 guarantee(_first_all_fine_prts != NULL && _last_all_fine_prts != NULL, "just checking"); | |
| 778 PerRegionTable::bulk_free(_first_all_fine_prts, _last_all_fine_prts); | |
| 779 memset(_fine_grain_regions, 0, _max_fine_entries * sizeof(_fine_grain_regions[0])); | |
| 780 } else { | |
| 781 guarantee(_first_all_fine_prts == NULL && _last_all_fine_prts == NULL, "just checking"); | |
| 342 | 782 } |
| 6253 | 783 |
| 784 _first_all_fine_prts = _last_all_fine_prts = NULL; | |
| 342 | 785 _sparse_table.clear(); |
| 786 _coarse_map.clear(); | |
| 787 _n_fine_entries = 0; | |
| 788 _n_coarse_entries = 0; | |
| 789 | |
| 790 clear_fcc(); | |
| 791 } | |
| 792 | |
| 793 bool OtherRegionsTable::del_single_region_table(size_t ind, | |
| 794 HeapRegion* hr) { | |
| 795 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
|
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796 PerRegionTable** prev_addr = &_fine_grain_regions[ind]; |
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797 PerRegionTable* prt = *prev_addr; |
| 342 | 798 while (prt != NULL && prt->hr() != hr) { |
| 6253 | 799 prev_addr = prt->collision_list_next_addr(); |
| 800 prt = prt->collision_list_next(); | |
| 342 | 801 } |
| 802 if (prt != NULL) { | |
| 803 assert(prt->hr() == hr, "Loop postcondition."); | |
| 6253 | 804 *prev_addr = prt->collision_list_next(); |
| 805 unlink_from_all(prt); | |
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806 PerRegionTable::free(prt); |
| 342 | 807 _n_fine_entries--; |
| 808 return true; | |
| 809 } else { | |
| 810 return false; | |
| 811 } | |
| 812 } | |
| 813 | |
|
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814 bool OtherRegionsTable::contains_reference(OopOrNarrowOopStar from) const { |
| 342 | 815 // Cast away const in this case. |
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816 MutexLockerEx x((Mutex*)_m, Mutex::_no_safepoint_check_flag); |
| 342 | 817 return contains_reference_locked(from); |
| 818 } | |
| 819 | |
|
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820 bool OtherRegionsTable::contains_reference_locked(OopOrNarrowOopStar from) const { |
| 342 | 821 HeapRegion* hr = _g1h->heap_region_containing_raw(from); |
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822 RegionIdx_t hr_ind = (RegionIdx_t) hr->hrm_index(); |
| 342 | 823 // Is this region in the coarse map? |
| 824 if (_coarse_map.at(hr_ind)) return true; | |
| 825 | |
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826 PerRegionTable* prt = find_region_table(hr_ind & _mod_max_fine_entries_mask, |
| 342 | 827 hr); |
| 828 if (prt != NULL) { | |
| 829 return prt->contains_reference(from); | |
| 830 | |
| 831 } else { | |
| 832 uintptr_t from_card = | |
| 833 (uintptr_t(from) >> CardTableModRefBS::card_shift); | |
| 834 uintptr_t hr_bot_card_index = | |
| 835 uintptr_t(hr->bottom()) >> CardTableModRefBS::card_shift; | |
| 836 assert(from_card >= hr_bot_card_index, "Inv"); | |
|
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837 CardIdx_t card_index = from_card - hr_bot_card_index; |
|
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838 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
|
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839 "Must be in range."); |
|
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840 return _sparse_table.contains_card(hr_ind, card_index); |
| 342 | 841 } |
| 842 } | |
| 843 | |
| 2173 | 844 void |
| 845 OtherRegionsTable::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
| 846 _sparse_table.do_cleanup_work(hrrs_cleanup_task); | |
| 847 } | |
| 848 | |
|
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849 // Determines how many threads can add records to an rset in parallel. |
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850 // This can be done by either mutator threads together with the |
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851 // concurrent refinement threads or GC threads. |
|
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852 uint HeapRegionRemSet::num_par_rem_sets() { |
|
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853 return MAX2(DirtyCardQueueSet::num_par_ids() + ConcurrentG1Refine::thread_num(), (uint)ParallelGCThreads); |
| 342 | 854 } |
| 855 | |
| 856 HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, | |
| 857 HeapRegion* hr) | |
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858 : _bosa(bosa), |
|
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859 _m(Mutex::leaf, FormatBuffer<128>("HeapRegionRemSet lock #%u", hr->hrm_index()), true), |
| 20337 | 860 _code_roots(), _other_regions(hr, &_m), _iter_state(Unclaimed), _iter_claimed(0) { |
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861 reset_for_par_iteration(); |
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862 } |
| 342 | 863 |
|
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864 void HeapRegionRemSet::setup_remset_size() { |
|
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865 // Setup sparse and fine-grain tables sizes. |
|
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866 // table_size = base * (log(region_size / 1M) + 1) |
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867 const int LOG_M = 20; |
|
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868 int region_size_log_mb = MAX2(HeapRegion::LogOfHRGrainBytes - LOG_M, 0); |
|
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869 if (FLAG_IS_DEFAULT(G1RSetSparseRegionEntries)) { |
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870 G1RSetSparseRegionEntries = G1RSetSparseRegionEntriesBase * (region_size_log_mb + 1); |
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871 } |
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872 if (FLAG_IS_DEFAULT(G1RSetRegionEntries)) { |
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873 G1RSetRegionEntries = G1RSetRegionEntriesBase * (region_size_log_mb + 1); |
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874 } |
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875 guarantee(G1RSetSparseRegionEntries > 0 && G1RSetRegionEntries > 0 , "Sanity"); |
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876 } |
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877 |
|
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878 class VerifyNoZombies : public CodeBlobClosure { |
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879 private: |
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880 HeapRegionRemSet* _rem_set; |
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881 public: |
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882 VerifyNoZombies(HeapRegionRemSet* rem_set) : _rem_set(rem_set) {} |
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883 void do_code_blob(CodeBlob* blob) { |
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884 guarantee(blob->as_nmethod_or_null()->is_alive(), err_msg("zombie nmethod %d " INTPTR_FORMAT " " INTPTR_FORMAT " in remembered set", |
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885 blob->as_nmethod_or_null()->compile_id(), blob, _rem_set)); |
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886 } |
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887 }; |
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888 |
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889 void HeapRegionRemSet::verify() { |
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890 VerifyNoZombies blk(this); |
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891 _code_roots.nmethods_do(&blk); |
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892 } |
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893 |
| 342 | 894 bool HeapRegionRemSet::claim_iter() { |
| 895 if (_iter_state != Unclaimed) return false; | |
| 896 jint res = Atomic::cmpxchg(Claimed, (jint*)(&_iter_state), Unclaimed); | |
| 897 return (res == Unclaimed); | |
| 898 } | |
| 899 | |
| 900 void HeapRegionRemSet::set_iter_complete() { | |
| 901 _iter_state = Complete; | |
| 902 } | |
| 903 | |
| 904 bool HeapRegionRemSet::iter_is_complete() { | |
| 905 return _iter_state == Complete; | |
| 906 } | |
| 907 | |
| 908 #ifndef PRODUCT | |
|
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909 void HeapRegionRemSet::print() { |
|
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910 HeapRegionRemSetIterator iter(this); |
| 342 | 911 size_t card_index; |
| 912 while (iter.has_next(card_index)) { | |
| 913 HeapWord* card_start = | |
| 914 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
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915 gclog_or_tty->print_cr(" Card " PTR_FORMAT, card_start); |
| 342 | 916 } |
| 917 if (iter.n_yielded() != occupied()) { | |
| 918 gclog_or_tty->print_cr("Yielded disagrees with occupied:"); | |
| 919 gclog_or_tty->print_cr(" %6d yielded (%6d coarse, %6d fine).", | |
| 920 iter.n_yielded(), | |
| 921 iter.n_yielded_coarse(), iter.n_yielded_fine()); | |
| 922 gclog_or_tty->print_cr(" %6d occ (%6d coarse, %6d fine).", | |
| 923 occupied(), occ_coarse(), occ_fine()); | |
| 924 } | |
| 925 guarantee(iter.n_yielded() == occupied(), | |
| 926 "We should have yielded all the represented cards."); | |
| 927 } | |
| 928 #endif | |
| 929 | |
| 930 void HeapRegionRemSet::cleanup() { | |
| 931 SparsePRT::cleanup_all(); | |
| 932 } | |
| 933 | |
| 934 void HeapRegionRemSet::clear() { | |
|
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935 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); |
|
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936 clear_locked(); |
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937 } |
| 12080 | 938 |
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939 void HeapRegionRemSet::clear_locked() { |
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940 _code_roots.clear(); |
| 342 | 941 _other_regions.clear(); |
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942 assert(occupied_locked() == 0, "Should be clear."); |
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943 reset_for_par_iteration(); |
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944 } |
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945 |
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946 void HeapRegionRemSet::reset_for_par_iteration() { |
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947 _iter_state = Unclaimed; |
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948 _iter_claimed = 0; |
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949 // It's good to check this to make sure that the two methods are in sync. |
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950 assert(verify_ready_for_par_iteration(), "post-condition"); |
| 342 | 951 } |
| 952 | |
| 953 void HeapRegionRemSet::scrub(CardTableModRefBS* ctbs, | |
| 954 BitMap* region_bm, BitMap* card_bm) { | |
| 955 _other_regions.scrub(ctbs, region_bm, card_bm); | |
| 956 } | |
| 957 | |
| 12080 | 958 // Code roots support |
| 20494 | 959 // |
| 960 // The code root set is protected by two separate locking schemes | |
| 961 // When at safepoint the per-hrrs lock must be held during modifications | |
| 962 // except when doing a full gc. | |
| 963 // When not at safepoint the CodeCache_lock must be held during modifications. | |
| 964 // When concurrent readers access the contains() function | |
| 965 // (during the evacuation phase) no removals are allowed. | |
| 12080 | 966 |
| 967 void HeapRegionRemSet::add_strong_code_root(nmethod* nm) { | |
| 968 assert(nm != NULL, "sanity"); | |
| 20494 | 969 // Optimistic unlocked contains-check |
| 970 if (!_code_roots.contains(nm)) { | |
| 971 MutexLockerEx ml(&_m, Mutex::_no_safepoint_check_flag); | |
| 972 add_strong_code_root_locked(nm); | |
| 973 } | |
| 974 } | |
| 975 | |
| 976 void HeapRegionRemSet::add_strong_code_root_locked(nmethod* nm) { | |
| 977 assert(nm != NULL, "sanity"); | |
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978 _code_roots.add(nm); |
| 12080 | 979 } |
| 980 | |
| 981 void HeapRegionRemSet::remove_strong_code_root(nmethod* nm) { | |
| 982 assert(nm != NULL, "sanity"); | |
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983 assert_locked_or_safepoint(CodeCache_lock); |
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984 |
| 20494 | 985 MutexLockerEx ml(CodeCache_lock->owned_by_self() ? NULL : &_m, Mutex::_no_safepoint_check_flag); |
| 986 _code_roots.remove(nm); | |
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987 |
| 12080 | 988 // Check that there were no duplicates |
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989 guarantee(!_code_roots.contains(nm), "duplicate entry found"); |
| 12080 | 990 } |
| 991 | |
| 20494 | 992 void HeapRegionRemSet::strong_code_roots_do(CodeBlobClosure* blk) const { |
| 993 _code_roots.nmethods_do(blk); | |
| 12080 | 994 } |
| 995 | |
| 20494 | 996 void HeapRegionRemSet::clean_strong_code_roots(HeapRegion* hr) { |
| 997 _code_roots.clean(hr); | |
| 12080 | 998 } |
| 999 | |
| 1000 size_t HeapRegionRemSet::strong_code_roots_mem_size() { | |
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1001 return _code_roots.mem_size(); |
| 12080 | 1002 } |
| 1003 | |
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1004 HeapRegionRemSetIterator:: HeapRegionRemSetIterator(HeapRegionRemSet* hrrs) : |
|
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1005 _hrrs(hrrs), |
| 342 | 1006 _g1h(G1CollectedHeap::heap()), |
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1007 _coarse_map(&hrrs->_other_regions._coarse_map), |
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1008 _bosa(hrrs->bosa()), |
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1009 _is(Sparse), |
| 342 | 1010 // Set these values so that we increment to the first region. |
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1011 _coarse_cur_region_index(-1), |
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1012 _coarse_cur_region_cur_card(HeapRegion::CardsPerRegion-1), |
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1013 _cur_card_in_prt(HeapRegion::CardsPerRegion), |
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1014 _fine_cur_prt(NULL), |
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1015 _n_yielded_coarse(0), |
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1016 _n_yielded_fine(0), |
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1017 _n_yielded_sparse(0), |
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1018 _sparse_iter(&hrrs->_other_regions._sparse_table) {} |
| 342 | 1019 |
| 1020 bool HeapRegionRemSetIterator::coarse_has_next(size_t& card_index) { | |
| 1021 if (_hrrs->_other_regions._n_coarse_entries == 0) return false; | |
| 1022 // Go to the next card. | |
| 1023 _coarse_cur_region_cur_card++; | |
| 1024 // Was the last the last card in the current region? | |
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1025 if (_coarse_cur_region_cur_card == HeapRegion::CardsPerRegion) { |
| 342 | 1026 // Yes: find the next region. This may leave _coarse_cur_region_index |
| 1027 // Set to the last index, in which case there are no more coarse | |
| 1028 // regions. | |
| 1029 _coarse_cur_region_index = | |
| 1030 (int) _coarse_map->get_next_one_offset(_coarse_cur_region_index + 1); | |
| 1031 if ((size_t)_coarse_cur_region_index < _coarse_map->size()) { | |
| 1032 _coarse_cur_region_cur_card = 0; | |
| 1033 HeapWord* r_bot = | |
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1034 _g1h->region_at((uint) _coarse_cur_region_index)->bottom(); |
| 342 | 1035 _cur_region_card_offset = _bosa->index_for(r_bot); |
| 1036 } else { | |
| 1037 return false; | |
| 1038 } | |
| 1039 } | |
| 1040 // If we didn't return false above, then we can yield a card. | |
| 1041 card_index = _cur_region_card_offset + _coarse_cur_region_cur_card; | |
| 1042 return true; | |
| 1043 } | |
| 1044 | |
| 1045 bool HeapRegionRemSetIterator::fine_has_next(size_t& card_index) { | |
| 1046 if (fine_has_next()) { | |
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1047 _cur_card_in_prt = |
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1048 _fine_cur_prt->_bm.get_next_one_offset(_cur_card_in_prt + 1); |
| 342 | 1049 } |
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1050 if (_cur_card_in_prt == HeapRegion::CardsPerRegion) { |
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1051 // _fine_cur_prt may still be NULL in case if there are not PRTs at all for |
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1052 // the remembered set. |
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1053 if (_fine_cur_prt == NULL || _fine_cur_prt->next() == NULL) { |
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1054 return false; |
| 342 | 1055 } |
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1056 PerRegionTable* next_prt = _fine_cur_prt->next(); |
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1057 switch_to_prt(next_prt); |
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1058 _cur_card_in_prt = _fine_cur_prt->_bm.get_next_one_offset(_cur_card_in_prt + 1); |
| 342 | 1059 } |
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1060 |
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1061 card_index = _cur_region_card_offset + _cur_card_in_prt; |
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1062 guarantee(_cur_card_in_prt < HeapRegion::CardsPerRegion, |
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1063 err_msg("Card index "SIZE_FORMAT" must be within the region", _cur_card_in_prt)); |
| 342 | 1064 return true; |
| 1065 } | |
| 1066 | |
| 1067 bool HeapRegionRemSetIterator::fine_has_next() { | |
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1068 return _cur_card_in_prt != HeapRegion::CardsPerRegion; |
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1069 } |
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1070 |
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1071 void HeapRegionRemSetIterator::switch_to_prt(PerRegionTable* prt) { |
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1072 assert(prt != NULL, "Cannot switch to NULL prt"); |
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1073 _fine_cur_prt = prt; |
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1074 |
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1075 HeapWord* r_bot = _fine_cur_prt->hr()->bottom(); |
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1076 _cur_region_card_offset = _bosa->index_for(r_bot); |
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1077 |
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1078 // The bitmap scan for the PRT always scans from _cur_region_cur_card + 1. |
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1079 // To avoid special-casing this start case, and not miss the first bitmap |
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1080 // entry, initialize _cur_region_cur_card with -1 instead of 0. |
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1081 _cur_card_in_prt = (size_t)-1; |
| 342 | 1082 } |
| 1083 | |
| 1084 bool HeapRegionRemSetIterator::has_next(size_t& card_index) { | |
| 1085 switch (_is) { | |
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1086 case Sparse: { |
| 342 | 1087 if (_sparse_iter.has_next(card_index)) { |
| 1088 _n_yielded_sparse++; | |
| 1089 return true; | |
| 1090 } | |
| 1091 // Otherwise, deliberate fall-through | |
| 1092 _is = Fine; | |
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1093 PerRegionTable* initial_fine_prt = _hrrs->_other_regions._first_all_fine_prts; |
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1094 if (initial_fine_prt != NULL) { |
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1095 switch_to_prt(_hrrs->_other_regions._first_all_fine_prts); |
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1096 } |
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1097 } |
| 342 | 1098 case Fine: |
| 1099 if (fine_has_next(card_index)) { | |
| 1100 _n_yielded_fine++; | |
| 1101 return true; | |
| 1102 } | |
| 1103 // Otherwise, deliberate fall-through | |
| 1104 _is = Coarse; | |
| 1105 case Coarse: | |
| 1106 if (coarse_has_next(card_index)) { | |
| 1107 _n_yielded_coarse++; | |
| 1108 return true; | |
| 1109 } | |
| 1110 // Otherwise... | |
| 1111 break; | |
| 1112 } | |
| 1113 assert(ParallelGCThreads > 1 || | |
| 1114 n_yielded() == _hrrs->occupied(), | |
| 1115 "Should have yielded all the cards in the rem set " | |
| 1116 "(in the non-par case)."); | |
| 1117 return false; | |
| 1118 } | |
| 1119 | |
| 1120 | |
| 1121 | |
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1122 OopOrNarrowOopStar* HeapRegionRemSet::_recorded_oops = NULL; |
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1123 HeapWord** HeapRegionRemSet::_recorded_cards = NULL; |
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1124 HeapRegion** HeapRegionRemSet::_recorded_regions = NULL; |
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1125 int HeapRegionRemSet::_n_recorded = 0; |
| 342 | 1126 |
| 1127 HeapRegionRemSet::Event* HeapRegionRemSet::_recorded_events = NULL; | |
| 1128 int* HeapRegionRemSet::_recorded_event_index = NULL; | |
| 1129 int HeapRegionRemSet::_n_recorded_events = 0; | |
| 1130 | |
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1131 void HeapRegionRemSet::record(HeapRegion* hr, OopOrNarrowOopStar f) { |
| 342 | 1132 if (_recorded_oops == NULL) { |
| 1133 assert(_n_recorded == 0 | |
| 1134 && _recorded_cards == NULL | |
| 1135 && _recorded_regions == NULL, | |
| 1136 "Inv"); | |
| 6197 | 1137 _recorded_oops = NEW_C_HEAP_ARRAY(OopOrNarrowOopStar, MaxRecorded, mtGC); |
| 1138 _recorded_cards = NEW_C_HEAP_ARRAY(HeapWord*, MaxRecorded, mtGC); | |
| 1139 _recorded_regions = NEW_C_HEAP_ARRAY(HeapRegion*, MaxRecorded, mtGC); | |
| 342 | 1140 } |
| 1141 if (_n_recorded == MaxRecorded) { | |
| 1142 gclog_or_tty->print_cr("Filled up 'recorded' (%d).", MaxRecorded); | |
| 1143 } else { | |
| 1144 _recorded_cards[_n_recorded] = | |
| 1145 (HeapWord*)align_size_down(uintptr_t(f), | |
| 1146 CardTableModRefBS::card_size); | |
| 1147 _recorded_oops[_n_recorded] = f; | |
| 1148 _recorded_regions[_n_recorded] = hr; | |
| 1149 _n_recorded++; | |
| 1150 } | |
| 1151 } | |
| 1152 | |
| 1153 void HeapRegionRemSet::record_event(Event evnt) { | |
| 1154 if (!G1RecordHRRSEvents) return; | |
| 1155 | |
| 1156 if (_recorded_events == NULL) { | |
| 1157 assert(_n_recorded_events == 0 | |
| 1158 && _recorded_event_index == NULL, | |
| 1159 "Inv"); | |
| 6197 | 1160 _recorded_events = NEW_C_HEAP_ARRAY(Event, MaxRecordedEvents, mtGC); |
| 1161 _recorded_event_index = NEW_C_HEAP_ARRAY(int, MaxRecordedEvents, mtGC); | |
| 342 | 1162 } |
| 1163 if (_n_recorded_events == MaxRecordedEvents) { | |
| 1164 gclog_or_tty->print_cr("Filled up 'recorded_events' (%d).", MaxRecordedEvents); | |
| 1165 } else { | |
| 1166 _recorded_events[_n_recorded_events] = evnt; | |
| 1167 _recorded_event_index[_n_recorded_events] = _n_recorded; | |
| 1168 _n_recorded_events++; | |
| 1169 } | |
| 1170 } | |
| 1171 | |
| 1172 void HeapRegionRemSet::print_event(outputStream* str, Event evnt) { | |
| 1173 switch (evnt) { | |
| 1174 case Event_EvacStart: | |
| 1175 str->print("Evac Start"); | |
| 1176 break; | |
| 1177 case Event_EvacEnd: | |
| 1178 str->print("Evac End"); | |
| 1179 break; | |
| 1180 case Event_RSUpdateEnd: | |
| 1181 str->print("RS Update End"); | |
| 1182 break; | |
| 1183 } | |
| 1184 } | |
| 1185 | |
| 1186 void HeapRegionRemSet::print_recorded() { | |
| 1187 int cur_evnt = 0; | |
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1188 Event cur_evnt_kind = Event_illegal; |
| 342 | 1189 int cur_evnt_ind = 0; |
| 1190 if (_n_recorded_events > 0) { | |
| 1191 cur_evnt_kind = _recorded_events[cur_evnt]; | |
| 1192 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
| 1193 } | |
| 1194 | |
| 1195 for (int i = 0; i < _n_recorded; i++) { | |
| 1196 while (cur_evnt < _n_recorded_events && i == cur_evnt_ind) { | |
| 1197 gclog_or_tty->print("Event: "); | |
| 1198 print_event(gclog_or_tty, cur_evnt_kind); | |
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1199 gclog_or_tty->cr(); |
| 342 | 1200 cur_evnt++; |
| 1201 if (cur_evnt < MaxRecordedEvents) { | |
| 1202 cur_evnt_kind = _recorded_events[cur_evnt]; | |
| 1203 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
| 1204 } | |
| 1205 } | |
| 1206 gclog_or_tty->print("Added card " PTR_FORMAT " to region [" PTR_FORMAT "...]" | |
| 1207 " for ref " PTR_FORMAT ".\n", | |
| 1208 _recorded_cards[i], _recorded_regions[i]->bottom(), | |
| 1209 _recorded_oops[i]); | |
| 1210 } | |
| 1211 } | |
| 1212 | |
| 2173 | 1213 void HeapRegionRemSet::reset_for_cleanup_tasks() { |
| 1214 SparsePRT::reset_for_cleanup_tasks(); | |
| 1215 } | |
| 1216 | |
| 1217 void HeapRegionRemSet::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
| 1218 _other_regions.do_cleanup_work(hrrs_cleanup_task); | |
| 1219 } | |
| 1220 | |
| 1221 void | |
| 1222 HeapRegionRemSet::finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task) { | |
| 1223 SparsePRT::finish_cleanup_task(hrrs_cleanup_task); | |
| 1224 } | |
| 1225 | |
| 342 | 1226 #ifndef PRODUCT |
|
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1227 void PerRegionTable::test_fl_mem_size() { |
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1228 PerRegionTable* dummy = alloc(NULL); |
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1229 |
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1230 size_t min_prt_size = sizeof(void*) + dummy->bm()->size_in_words() * HeapWordSize; |
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1231 assert(dummy->mem_size() > min_prt_size, |
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1232 err_msg("PerRegionTable memory usage is suspiciously small, only has "SIZE_FORMAT" bytes. " |
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1233 "Should be at least "SIZE_FORMAT" bytes.", dummy->mem_size(), min_prt_size)); |
|
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1234 free(dummy); |
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1235 guarantee(dummy->mem_size() == fl_mem_size(), "fl_mem_size() does not return the correct element size"); |
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1236 // try to reset the state |
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1237 _free_list = NULL; |
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1238 delete dummy; |
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1239 } |
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1240 |
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1241 void HeapRegionRemSet::test_prt() { |
|
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1242 PerRegionTable::test_fl_mem_size(); |
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1243 } |
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1244 |
| 342 | 1245 void HeapRegionRemSet::test() { |
| 1246 os::sleep(Thread::current(), (jlong)5000, false); | |
| 1247 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 1248 | |
|
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1249 // Run with "-XX:G1LogRSetRegionEntries=2", so that 1 and 5 end up in same |
| 342 | 1250 // hash bucket. |
| 1251 HeapRegion* hr0 = g1h->region_at(0); | |
| 1252 HeapRegion* hr1 = g1h->region_at(1); | |
| 1253 HeapRegion* hr2 = g1h->region_at(5); | |
| 1254 HeapRegion* hr3 = g1h->region_at(6); | |
| 1255 HeapRegion* hr4 = g1h->region_at(7); | |
| 1256 HeapRegion* hr5 = g1h->region_at(8); | |
| 1257 | |
| 1258 HeapWord* hr1_start = hr1->bottom(); | |
| 1259 HeapWord* hr1_mid = hr1_start + HeapRegion::GrainWords/2; | |
| 1260 HeapWord* hr1_last = hr1->end() - 1; | |
| 1261 | |
| 1262 HeapWord* hr2_start = hr2->bottom(); | |
| 1263 HeapWord* hr2_mid = hr2_start + HeapRegion::GrainWords/2; | |
| 1264 HeapWord* hr2_last = hr2->end() - 1; | |
| 1265 | |
| 1266 HeapWord* hr3_start = hr3->bottom(); | |
| 1267 HeapWord* hr3_mid = hr3_start + HeapRegion::GrainWords/2; | |
| 1268 HeapWord* hr3_last = hr3->end() - 1; | |
| 1269 | |
| 1270 HeapRegionRemSet* hrrs = hr0->rem_set(); | |
| 1271 | |
| 1272 // Make three references from region 0x101... | |
|
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1273 hrrs->add_reference((OopOrNarrowOopStar)hr1_start); |
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1274 hrrs->add_reference((OopOrNarrowOopStar)hr1_mid); |
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1275 hrrs->add_reference((OopOrNarrowOopStar)hr1_last); |
| 342 | 1276 |
|
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1277 hrrs->add_reference((OopOrNarrowOopStar)hr2_start); |
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1278 hrrs->add_reference((OopOrNarrowOopStar)hr2_mid); |
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1279 hrrs->add_reference((OopOrNarrowOopStar)hr2_last); |
| 342 | 1280 |
|
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1281 hrrs->add_reference((OopOrNarrowOopStar)hr3_start); |
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1282 hrrs->add_reference((OopOrNarrowOopStar)hr3_mid); |
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1283 hrrs->add_reference((OopOrNarrowOopStar)hr3_last); |
| 342 | 1284 |
| 1285 // Now cause a coarsening. | |
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1286 hrrs->add_reference((OopOrNarrowOopStar)hr4->bottom()); |
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1287 hrrs->add_reference((OopOrNarrowOopStar)hr5->bottom()); |
| 342 | 1288 |
| 1289 // Now, does iteration yield these three? | |
|
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1290 HeapRegionRemSetIterator iter(hrrs); |
| 342 | 1291 size_t sum = 0; |
| 1292 size_t card_index; | |
| 1293 while (iter.has_next(card_index)) { | |
| 1294 HeapWord* card_start = | |
| 1295 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
| 1296 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); | |
| 1297 sum++; | |
| 1298 } | |
| 1299 guarantee(sum == 11 - 3 + 2048, "Failure"); | |
| 1300 guarantee(sum == hrrs->occupied(), "Failure"); | |
| 1301 } | |
| 1302 #endif |