Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp @ 21811:22ac20a25842
8055479: TLAB stability
Reviewed-by: brutisso, stefank, ahgross
author | mgerdin |
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date | Thu, 09 Oct 2014 15:42:23 +0200 |
parents | 78bbf4d43a14 |
children | ff7b317d2af8 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2014, 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" | |
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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 | |
122 HeapRegion* hr() const { return _hr; } | |
123 | |
124 jint occupied() const { | |
125 // Overkill, but if we ever need it... | |
126 // guarantee(_occupied == _bm.count_one_bits(), "Check"); | |
127 return _occupied; | |
128 } | |
129 | |
6253 | 130 void init(HeapRegion* hr, bool clear_links_to_all_list) { |
131 if (clear_links_to_all_list) { | |
132 set_next(NULL); | |
133 set_prev(NULL); | |
134 } | |
342 | 135 _hr = hr; |
6253 | 136 _collision_list_next = NULL; |
342 | 137 _occupied = 0; |
138 _bm.clear(); | |
139 } | |
140 | |
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141 void add_reference(OopOrNarrowOopStar from) { |
342 | 142 add_reference_work(from, /*parallel*/ true); |
143 } | |
144 | |
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145 void seq_add_reference(OopOrNarrowOopStar from) { |
342 | 146 add_reference_work(from, /*parallel*/ false); |
147 } | |
148 | |
149 void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { | |
150 HeapWord* hr_bot = hr()->bottom(); | |
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151 size_t hr_first_card_index = ctbs->index_for(hr_bot); |
342 | 152 bm()->set_intersection_at_offset(*card_bm, hr_first_card_index); |
153 recount_occupied(); | |
154 } | |
155 | |
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156 void add_card(CardIdx_t from_card_index) { |
342 | 157 add_card_work(from_card_index, /*parallel*/ true); |
158 } | |
159 | |
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160 void seq_add_card(CardIdx_t from_card_index) { |
342 | 161 add_card_work(from_card_index, /*parallel*/ false); |
162 } | |
163 | |
164 // (Destructively) union the bitmap of the current table into the given | |
165 // bitmap (which is assumed to be of the same size.) | |
166 void union_bitmap_into(BitMap* bm) { | |
167 bm->set_union(_bm); | |
168 } | |
169 | |
170 // Mem size in bytes. | |
171 size_t mem_size() const { | |
172 return sizeof(this) + _bm.size_in_words() * HeapWordSize; | |
173 } | |
174 | |
175 // Requires "from" to be in "hr()". | |
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176 bool contains_reference(OopOrNarrowOopStar from) const { |
342 | 177 assert(hr()->is_in_reserved(from), "Precondition."); |
178 size_t card_ind = pointer_delta(from, hr()->bottom(), | |
179 CardTableModRefBS::card_size); | |
180 return _bm.at(card_ind); | |
181 } | |
182 | |
6253 | 183 // Bulk-free the PRTs from prt to last, assumes that they are |
184 // linked together using their _next field. | |
185 static void bulk_free(PerRegionTable* prt, PerRegionTable* last) { | |
342 | 186 while (true) { |
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187 PerRegionTable* fl = _free_list; |
6253 | 188 last->set_next(fl); |
189 PerRegionTable* res = (PerRegionTable*) Atomic::cmpxchg_ptr(prt, &_free_list, fl); | |
190 if (res == fl) { | |
191 return; | |
192 } | |
342 | 193 } |
194 ShouldNotReachHere(); | |
195 } | |
196 | |
6253 | 197 static void free(PerRegionTable* prt) { |
198 bulk_free(prt, prt); | |
199 } | |
200 | |
201 // Returns an initialized PerRegionTable instance. | |
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202 static PerRegionTable* alloc(HeapRegion* hr) { |
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203 PerRegionTable* fl = _free_list; |
342 | 204 while (fl != NULL) { |
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205 PerRegionTable* nxt = fl->next(); |
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206 PerRegionTable* res = |
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207 (PerRegionTable*) |
342 | 208 Atomic::cmpxchg_ptr(nxt, &_free_list, fl); |
209 if (res == fl) { | |
6253 | 210 fl->init(hr, true); |
342 | 211 return fl; |
212 } else { | |
213 fl = _free_list; | |
214 } | |
215 } | |
216 assert(fl == NULL, "Loop condition."); | |
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217 return new PerRegionTable(hr); |
342 | 218 } |
219 | |
6253 | 220 PerRegionTable* next() const { return _next; } |
221 void set_next(PerRegionTable* next) { _next = next; } | |
222 PerRegionTable* prev() const { return _prev; } | |
223 void set_prev(PerRegionTable* prev) { _prev = prev; } | |
224 | |
225 // Accessor and Modification routines for the pointer for the | |
226 // singly linked collision list that links the PRTs within the | |
227 // OtherRegionsTable::_fine_grain_regions hash table. | |
228 // | |
229 // It might be useful to also make the collision list doubly linked | |
230 // to avoid iteration over the collisions list during scrubbing/deletion. | |
231 // OTOH there might not be many collisions. | |
232 | |
233 PerRegionTable* collision_list_next() const { | |
234 return _collision_list_next; | |
235 } | |
236 | |
237 void set_collision_list_next(PerRegionTable* next) { | |
238 _collision_list_next = next; | |
239 } | |
240 | |
241 PerRegionTable** collision_list_next_addr() { | |
242 return &_collision_list_next; | |
243 } | |
244 | |
342 | 245 static size_t fl_mem_size() { |
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246 PerRegionTable* cur = _free_list; |
342 | 247 size_t res = 0; |
248 while (cur != NULL) { | |
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249 res += cur->mem_size(); |
342 | 250 cur = cur->next(); |
251 } | |
252 return res; | |
253 } | |
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254 |
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255 static void test_fl_mem_size(); |
342 | 256 }; |
257 | |
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258 PerRegionTable* PerRegionTable::_free_list = NULL; |
342 | 259 |
260 size_t OtherRegionsTable::_max_fine_entries = 0; | |
261 size_t OtherRegionsTable::_mod_max_fine_entries_mask = 0; | |
262 size_t OtherRegionsTable::_fine_eviction_stride = 0; | |
263 size_t OtherRegionsTable::_fine_eviction_sample_size = 0; | |
264 | |
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265 OtherRegionsTable::OtherRegionsTable(HeapRegion* hr, Mutex* m) : |
342 | 266 _g1h(G1CollectedHeap::heap()), |
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267 _hr(hr), _m(m), |
342 | 268 _coarse_map(G1CollectedHeap::heap()->max_regions(), |
269 false /* in-resource-area */), | |
270 _fine_grain_regions(NULL), | |
6253 | 271 _first_all_fine_prts(NULL), _last_all_fine_prts(NULL), |
342 | 272 _n_fine_entries(0), _n_coarse_entries(0), |
273 _fine_eviction_start(0), | |
274 _sparse_table(hr) | |
275 { | |
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276 typedef PerRegionTable* PerRegionTablePtr; |
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277 |
342 | 278 if (_max_fine_entries == 0) { |
279 assert(_mod_max_fine_entries_mask == 0, "Both or none."); | |
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280 size_t max_entries_log = (size_t)log2_long((jlong)G1RSetRegionEntries); |
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281 _max_fine_entries = (size_t)1 << max_entries_log; |
342 | 282 _mod_max_fine_entries_mask = _max_fine_entries - 1; |
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283 |
342 | 284 assert(_fine_eviction_sample_size == 0 |
285 && _fine_eviction_stride == 0, "All init at same time."); | |
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286 _fine_eviction_sample_size = MAX2((size_t)4, max_entries_log); |
342 | 287 _fine_eviction_stride = _max_fine_entries / _fine_eviction_sample_size; |
288 } | |
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289 |
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290 _fine_grain_regions = NEW_C_HEAP_ARRAY3(PerRegionTablePtr, _max_fine_entries, |
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291 mtGC, 0, AllocFailStrategy::RETURN_NULL); |
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292 |
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293 if (_fine_grain_regions == NULL) { |
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294 vm_exit_out_of_memory(sizeof(void*)*_max_fine_entries, OOM_MALLOC_ERROR, |
342 | 295 "Failed to allocate _fine_grain_entries."); |
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296 } |
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297 |
342 | 298 for (size_t i = 0; i < _max_fine_entries; i++) { |
299 _fine_grain_regions[i] = NULL; | |
300 } | |
301 } | |
302 | |
6253 | 303 void OtherRegionsTable::link_to_all(PerRegionTable* prt) { |
304 // We always append to the beginning of the list for convenience; | |
305 // the order of entries in this list does not matter. | |
306 if (_first_all_fine_prts != NULL) { | |
307 assert(_first_all_fine_prts->prev() == NULL, "invariant"); | |
308 _first_all_fine_prts->set_prev(prt); | |
309 prt->set_next(_first_all_fine_prts); | |
310 } else { | |
311 // this is the first element we insert. Adjust the "last" pointer | |
312 _last_all_fine_prts = prt; | |
313 assert(prt->next() == NULL, "just checking"); | |
314 } | |
315 // the new element is always the first element without a predecessor | |
316 prt->set_prev(NULL); | |
317 _first_all_fine_prts = prt; | |
318 | |
319 assert(prt->prev() == NULL, "just checking"); | |
320 assert(_first_all_fine_prts == prt, "just checking"); | |
321 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || | |
322 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), | |
323 "just checking"); | |
324 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, | |
325 "just checking"); | |
326 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, | |
327 "just checking"); | |
328 } | |
329 | |
330 void OtherRegionsTable::unlink_from_all(PerRegionTable* prt) { | |
331 if (prt->prev() != NULL) { | |
332 assert(_first_all_fine_prts != prt, "just checking"); | |
333 prt->prev()->set_next(prt->next()); | |
334 // removing the last element in the list? | |
335 if (_last_all_fine_prts == prt) { | |
336 _last_all_fine_prts = prt->prev(); | |
337 } | |
338 } else { | |
339 assert(_first_all_fine_prts == prt, "just checking"); | |
340 _first_all_fine_prts = prt->next(); | |
341 // list is empty now? | |
342 if (_first_all_fine_prts == NULL) { | |
343 _last_all_fine_prts = NULL; | |
344 } | |
345 } | |
346 | |
347 if (prt->next() != NULL) { | |
348 prt->next()->set_prev(prt->prev()); | |
349 } | |
350 | |
351 prt->set_next(NULL); | |
352 prt->set_prev(NULL); | |
353 | |
354 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || | |
355 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), | |
356 "just checking"); | |
357 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, | |
358 "just checking"); | |
359 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, | |
360 "just checking"); | |
361 } | |
362 | |
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363 int** FromCardCache::_cache = NULL; |
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364 uint FromCardCache::_max_regions = 0; |
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365 size_t FromCardCache::_static_mem_size = 0; |
342 | 366 |
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367 void FromCardCache::initialize(uint n_par_rs, uint max_num_regions) { |
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368 guarantee(_cache == NULL, "Should not call this multiple times"); |
342 | 369 |
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370 _max_regions = max_num_regions; |
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371 _cache = Padded2DArray<int, mtGC>::create_unfreeable(n_par_rs, |
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372 _max_regions, |
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373 &_static_mem_size); |
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374 |
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375 for (uint i = 0; i < n_par_rs; i++) { |
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376 for (uint j = 0; j < _max_regions; j++) { |
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377 set(i, j, InvalidCard); |
342 | 378 } |
379 } | |
380 } | |
381 | |
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382 void FromCardCache::shrink(uint new_num_regions) { |
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383 for (uint i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { |
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384 assert(new_num_regions <= _max_regions, "Must be within max."); |
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385 for (uint j = new_num_regions; j < _max_regions; j++) { |
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386 set(i, j, InvalidCard); |
342 | 387 } |
388 } | |
389 } | |
390 | |
391 #ifndef PRODUCT | |
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392 void FromCardCache::print(outputStream* out) { |
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393 for (uint i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { |
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394 for (uint j = 0; j < _max_regions; j++) { |
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395 out->print_cr("_from_card_cache["UINT32_FORMAT"]["UINT32_FORMAT"] = "INT32_FORMAT".", |
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396 i, j, at(i, j)); |
342 | 397 } |
398 } | |
399 } | |
400 #endif | |
401 | |
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402 void FromCardCache::clear(uint region_idx) { |
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403 uint num_par_remsets = HeapRegionRemSet::num_par_rem_sets(); |
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404 for (uint i = 0; i < num_par_remsets; i++) { |
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405 set(i, region_idx, InvalidCard); |
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406 } |
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407 } |
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408 |
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409 void OtherRegionsTable::init_from_card_cache(uint max_regions) { |
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410 FromCardCache::initialize(HeapRegionRemSet::num_par_rem_sets(), max_regions); |
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411 } |
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412 |
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413 void OtherRegionsTable::shrink_from_card_cache(uint new_num_regions) { |
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414 FromCardCache::shrink(new_num_regions); |
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415 } |
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416 |
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417 void OtherRegionsTable::print_from_card_cache() { |
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418 FromCardCache::print(); |
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419 } |
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420 |
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421 void OtherRegionsTable::add_reference(OopOrNarrowOopStar from, int tid) { |
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422 uint cur_hrs_ind = hr()->hrs_index(); |
342 | 423 |
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424 if (G1TraceHeapRegionRememberedSet) { |
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425 gclog_or_tty->print_cr("ORT::add_reference_work(" PTR_FORMAT "->" PTR_FORMAT ").", |
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426 from, |
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427 UseCompressedOops |
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428 ? (void *)oopDesc::load_decode_heap_oop((narrowOop*)from) |
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429 : (void *)oopDesc::load_decode_heap_oop((oop*)from)); |
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430 } |
342 | 431 |
432 int from_card = (int)(uintptr_t(from) >> CardTableModRefBS::card_shift); | |
433 | |
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434 if (G1TraceHeapRegionRememberedSet) { |
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435 gclog_or_tty->print_cr("Table for [" PTR_FORMAT "...): card %d (cache = "INT32_FORMAT")", |
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436 hr()->bottom(), from_card, |
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437 FromCardCache::at((uint)tid, cur_hrs_ind)); |
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438 } |
342 | 439 |
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440 if (FromCardCache::contains_or_replace((uint)tid, cur_hrs_ind, from_card)) { |
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441 if (G1TraceHeapRegionRememberedSet) { |
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442 gclog_or_tty->print_cr(" from-card cache hit."); |
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443 } |
342 | 444 assert(contains_reference(from), "We just added it!"); |
445 return; | |
446 } | |
447 | |
448 // Note that this may be a continued H region. | |
449 HeapRegion* from_hr = _g1h->heap_region_containing_raw(from); | |
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450 RegionIdx_t from_hrs_ind = (RegionIdx_t) from_hr->hrs_index(); |
342 | 451 |
452 // If the region is already coarsened, return. | |
453 if (_coarse_map.at(from_hrs_ind)) { | |
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454 if (G1TraceHeapRegionRememberedSet) { |
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455 gclog_or_tty->print_cr(" coarse map hit."); |
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456 } |
342 | 457 assert(contains_reference(from), "We just added it!"); |
458 return; | |
459 } | |
460 | |
461 // Otherwise find a per-region table to add it to. | |
462 size_t ind = from_hrs_ind & _mod_max_fine_entries_mask; | |
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463 PerRegionTable* prt = find_region_table(ind, from_hr); |
342 | 464 if (prt == NULL) { |
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465 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); |
342 | 466 // Confirm that it's really not there... |
467 prt = find_region_table(ind, from_hr); | |
468 if (prt == NULL) { | |
469 | |
470 uintptr_t from_hr_bot_card_index = | |
471 uintptr_t(from_hr->bottom()) | |
472 >> CardTableModRefBS::card_shift; | |
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473 CardIdx_t card_index = from_card - from_hr_bot_card_index; |
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474 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
342 | 475 "Must be in range."); |
476 if (G1HRRSUseSparseTable && | |
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477 _sparse_table.add_card(from_hrs_ind, card_index)) { |
342 | 478 if (G1RecordHRRSOops) { |
479 HeapRegionRemSet::record(hr(), from); | |
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480 if (G1TraceHeapRegionRememberedSet) { |
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481 gclog_or_tty->print(" Added card " PTR_FORMAT " to region " |
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482 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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483 align_size_down(uintptr_t(from), |
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484 CardTableModRefBS::card_size), |
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485 hr()->bottom(), from); |
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486 } |
342 | 487 } |
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488 if (G1TraceHeapRegionRememberedSet) { |
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489 gclog_or_tty->print_cr(" added card to sparse table."); |
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490 } |
342 | 491 assert(contains_reference_locked(from), "We just added it!"); |
492 return; | |
493 } else { | |
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494 if (G1TraceHeapRegionRememberedSet) { |
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495 gclog_or_tty->print_cr(" [tid %d] sparse table entry " |
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496 "overflow(f: %d, t: %d)", |
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497 tid, from_hrs_ind, cur_hrs_ind); |
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498 } |
342 | 499 } |
500 | |
501 if (_n_fine_entries == _max_fine_entries) { | |
502 prt = delete_region_table(); | |
6253 | 503 // There is no need to clear the links to the 'all' list here: |
504 // prt will be reused immediately, i.e. remain in the 'all' list. | |
505 prt->init(from_hr, false /* clear_links_to_all_list */); | |
342 | 506 } else { |
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507 prt = PerRegionTable::alloc(from_hr); |
6253 | 508 link_to_all(prt); |
342 | 509 } |
510 | |
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511 PerRegionTable* first_prt = _fine_grain_regions[ind]; |
6253 | 512 prt->set_collision_list_next(first_prt); |
342 | 513 _fine_grain_regions[ind] = prt; |
514 _n_fine_entries++; | |
515 | |
516 if (G1HRRSUseSparseTable) { | |
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517 // Transfer from sparse to fine-grain. |
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518 SparsePRTEntry *sprt_entry = _sparse_table.get_entry(from_hrs_ind); |
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519 assert(sprt_entry != NULL, "There should have been an entry"); |
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520 for (int i = 0; i < SparsePRTEntry::cards_num(); i++) { |
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521 CardIdx_t c = sprt_entry->card(i); |
342 | 522 if (c != SparsePRTEntry::NullEntry) { |
523 prt->add_card(c); | |
524 } | |
525 } | |
526 // Now we can delete the sparse entry. | |
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527 bool res = _sparse_table.delete_entry(from_hrs_ind); |
342 | 528 assert(res, "It should have been there."); |
529 } | |
530 } | |
531 assert(prt != NULL && prt->hr() == from_hr, "consequence"); | |
532 } | |
533 // Note that we can't assert "prt->hr() == from_hr", because of the | |
534 // possibility of concurrent reuse. But see head comment of | |
535 // OtherRegionsTable for why this is OK. | |
536 assert(prt != NULL, "Inv"); | |
537 | |
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538 prt->add_reference(from); |
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539 |
342 | 540 if (G1RecordHRRSOops) { |
541 HeapRegionRemSet::record(hr(), from); | |
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542 if (G1TraceHeapRegionRememberedSet) { |
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543 gclog_or_tty->print("Added card " PTR_FORMAT " to region " |
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544 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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545 align_size_down(uintptr_t(from), |
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546 CardTableModRefBS::card_size), |
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547 hr()->bottom(), from); |
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548 } |
342 | 549 } |
550 assert(contains_reference(from), "We just added it!"); | |
551 } | |
552 | |
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553 PerRegionTable* |
342 | 554 OtherRegionsTable::find_region_table(size_t ind, HeapRegion* hr) const { |
555 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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556 PerRegionTable* prt = _fine_grain_regions[ind]; |
342 | 557 while (prt != NULL && prt->hr() != hr) { |
6253 | 558 prt = prt->collision_list_next(); |
342 | 559 } |
560 // Loop postcondition is the method postcondition. | |
561 return prt; | |
562 } | |
563 | |
564 jint OtherRegionsTable::_n_coarsenings = 0; | |
565 | |
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566 PerRegionTable* OtherRegionsTable::delete_region_table() { |
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567 assert(_m->owned_by_self(), "Precondition"); |
342 | 568 assert(_n_fine_entries == _max_fine_entries, "Precondition"); |
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569 PerRegionTable* max = NULL; |
342 | 570 jint max_occ = 0; |
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571 PerRegionTable** max_prev; |
342 | 572 size_t max_ind; |
573 | |
574 size_t i = _fine_eviction_start; | |
575 for (size_t k = 0; k < _fine_eviction_sample_size; k++) { | |
576 size_t ii = i; | |
577 // Make sure we get a non-NULL sample. | |
578 while (_fine_grain_regions[ii] == NULL) { | |
579 ii++; | |
580 if (ii == _max_fine_entries) ii = 0; | |
581 guarantee(ii != i, "We must find one."); | |
582 } | |
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583 PerRegionTable** prev = &_fine_grain_regions[ii]; |
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584 PerRegionTable* cur = *prev; |
342 | 585 while (cur != NULL) { |
586 jint cur_occ = cur->occupied(); | |
587 if (max == NULL || cur_occ > max_occ) { | |
588 max = cur; | |
589 max_prev = prev; | |
590 max_ind = i; | |
591 max_occ = cur_occ; | |
592 } | |
6253 | 593 prev = cur->collision_list_next_addr(); |
594 cur = cur->collision_list_next(); | |
342 | 595 } |
596 i = i + _fine_eviction_stride; | |
597 if (i >= _n_fine_entries) i = i - _n_fine_entries; | |
598 } | |
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599 |
342 | 600 _fine_eviction_start++; |
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601 |
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602 if (_fine_eviction_start >= _n_fine_entries) { |
342 | 603 _fine_eviction_start -= _n_fine_entries; |
604 } | |
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605 |
342 | 606 guarantee(max != NULL, "Since _n_fine_entries > 0"); |
607 | |
608 // Set the corresponding coarse bit. | |
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609 size_t max_hrs_index = (size_t) max->hr()->hrs_index(); |
342 | 610 if (!_coarse_map.at(max_hrs_index)) { |
611 _coarse_map.at_put(max_hrs_index, true); | |
612 _n_coarse_entries++; | |
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613 if (G1TraceHeapRegionRememberedSet) { |
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614 gclog_or_tty->print("Coarsened entry in region [" PTR_FORMAT "...] " |
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615 "for region [" PTR_FORMAT "...] (%d coarse entries).\n", |
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616 hr()->bottom(), |
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617 max->hr()->bottom(), |
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618 _n_coarse_entries); |
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619 } |
342 | 620 } |
621 | |
622 // Unsplice. | |
6253 | 623 *max_prev = max->collision_list_next(); |
342 | 624 Atomic::inc(&_n_coarsenings); |
625 _n_fine_entries--; | |
626 return max; | |
627 } | |
628 | |
629 | |
630 // At present, this must be called stop-world single-threaded. | |
631 void OtherRegionsTable::scrub(CardTableModRefBS* ctbs, | |
632 BitMap* region_bm, BitMap* card_bm) { | |
633 // First eliminated garbage regions from the coarse map. | |
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634 if (G1RSScrubVerbose) { |
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635 gclog_or_tty->print_cr("Scrubbing region %u:", hr()->hrs_index()); |
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636 } |
342 | 637 |
638 assert(_coarse_map.size() == region_bm->size(), "Precondition"); | |
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639 if (G1RSScrubVerbose) { |
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640 gclog_or_tty->print(" Coarse map: before = "SIZE_FORMAT"...", |
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641 _n_coarse_entries); |
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642 } |
342 | 643 _coarse_map.set_intersection(*region_bm); |
644 _n_coarse_entries = _coarse_map.count_one_bits(); | |
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645 if (G1RSScrubVerbose) { |
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646 gclog_or_tty->print_cr(" after = "SIZE_FORMAT".", _n_coarse_entries); |
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647 } |
342 | 648 |
649 // Now do the fine-grained maps. | |
650 for (size_t i = 0; i < _max_fine_entries; i++) { | |
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651 PerRegionTable* cur = _fine_grain_regions[i]; |
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652 PerRegionTable** prev = &_fine_grain_regions[i]; |
342 | 653 while (cur != NULL) { |
6253 | 654 PerRegionTable* nxt = cur->collision_list_next(); |
342 | 655 // If the entire region is dead, eliminate. |
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656 if (G1RSScrubVerbose) { |
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657 gclog_or_tty->print_cr(" For other region %u:", |
3766 | 658 cur->hr()->hrs_index()); |
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659 } |
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660 if (!region_bm->at((size_t) cur->hr()->hrs_index())) { |
342 | 661 *prev = nxt; |
6253 | 662 cur->set_collision_list_next(NULL); |
342 | 663 _n_fine_entries--; |
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664 if (G1RSScrubVerbose) { |
342 | 665 gclog_or_tty->print_cr(" deleted via region map."); |
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666 } |
6253 | 667 unlink_from_all(cur); |
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668 PerRegionTable::free(cur); |
342 | 669 } else { |
670 // Do fine-grain elimination. | |
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671 if (G1RSScrubVerbose) { |
342 | 672 gclog_or_tty->print(" occ: before = %4d.", cur->occupied()); |
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673 } |
342 | 674 cur->scrub(ctbs, card_bm); |
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675 if (G1RSScrubVerbose) { |
342 | 676 gclog_or_tty->print_cr(" after = %4d.", cur->occupied()); |
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677 } |
342 | 678 // Did that empty the table completely? |
679 if (cur->occupied() == 0) { | |
680 *prev = nxt; | |
6253 | 681 cur->set_collision_list_next(NULL); |
342 | 682 _n_fine_entries--; |
6253 | 683 unlink_from_all(cur); |
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684 PerRegionTable::free(cur); |
342 | 685 } else { |
6253 | 686 prev = cur->collision_list_next_addr(); |
342 | 687 } |
688 } | |
689 cur = nxt; | |
690 } | |
691 } | |
692 // Since we may have deleted a from_card_cache entry from the RS, clear | |
693 // the FCC. | |
694 clear_fcc(); | |
695 } | |
696 | |
697 | |
698 size_t OtherRegionsTable::occupied() const { | |
699 size_t sum = occ_fine(); | |
700 sum += occ_sparse(); | |
701 sum += occ_coarse(); | |
702 return sum; | |
703 } | |
704 | |
705 size_t OtherRegionsTable::occ_fine() const { | |
706 size_t sum = 0; | |
6253 | 707 |
708 size_t num = 0; | |
709 PerRegionTable * cur = _first_all_fine_prts; | |
710 while (cur != NULL) { | |
711 sum += cur->occupied(); | |
712 cur = cur->next(); | |
713 num++; | |
342 | 714 } |
6253 | 715 guarantee(num == _n_fine_entries, "just checking"); |
342 | 716 return sum; |
717 } | |
718 | |
719 size_t OtherRegionsTable::occ_coarse() const { | |
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720 return (_n_coarse_entries * HeapRegion::CardsPerRegion); |
342 | 721 } |
722 | |
723 size_t OtherRegionsTable::occ_sparse() const { | |
724 return _sparse_table.occupied(); | |
725 } | |
726 | |
727 size_t OtherRegionsTable::mem_size() const { | |
728 size_t sum = 0; | |
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729 // all PRTs are of the same size so it is sufficient to query only one of them. |
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730 if (_first_all_fine_prts != NULL) { |
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731 assert(_last_all_fine_prts != NULL && |
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732 _first_all_fine_prts->mem_size() == _last_all_fine_prts->mem_size(), "check that mem_size() is constant"); |
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733 sum += _first_all_fine_prts->mem_size() * _n_fine_entries; |
342 | 734 } |
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735 sum += (sizeof(PerRegionTable*) * _max_fine_entries); |
342 | 736 sum += (_coarse_map.size_in_words() * HeapWordSize); |
737 sum += (_sparse_table.mem_size()); | |
738 sum += sizeof(*this) - sizeof(_sparse_table); // Avoid double counting above. | |
739 return sum; | |
740 } | |
741 | |
742 size_t OtherRegionsTable::static_mem_size() { | |
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743 return FromCardCache::static_mem_size(); |
342 | 744 } |
745 | |
746 size_t OtherRegionsTable::fl_mem_size() { | |
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747 return PerRegionTable::fl_mem_size(); |
342 | 748 } |
749 | |
750 void OtherRegionsTable::clear_fcc() { | |
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751 FromCardCache::clear(hr()->hrs_index()); |
342 | 752 } |
753 | |
754 void OtherRegionsTable::clear() { | |
6253 | 755 // if there are no entries, skip this step |
756 if (_first_all_fine_prts != NULL) { | |
757 guarantee(_first_all_fine_prts != NULL && _last_all_fine_prts != NULL, "just checking"); | |
758 PerRegionTable::bulk_free(_first_all_fine_prts, _last_all_fine_prts); | |
759 memset(_fine_grain_regions, 0, _max_fine_entries * sizeof(_fine_grain_regions[0])); | |
760 } else { | |
761 guarantee(_first_all_fine_prts == NULL && _last_all_fine_prts == NULL, "just checking"); | |
342 | 762 } |
6253 | 763 |
764 _first_all_fine_prts = _last_all_fine_prts = NULL; | |
342 | 765 _sparse_table.clear(); |
766 _coarse_map.clear(); | |
767 _n_fine_entries = 0; | |
768 _n_coarse_entries = 0; | |
769 | |
770 clear_fcc(); | |
771 } | |
772 | |
773 void OtherRegionsTable::clear_incoming_entry(HeapRegion* from_hr) { | |
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774 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); |
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775 size_t hrs_ind = (size_t) from_hr->hrs_index(); |
342 | 776 size_t ind = hrs_ind & _mod_max_fine_entries_mask; |
777 if (del_single_region_table(ind, from_hr)) { | |
778 assert(!_coarse_map.at(hrs_ind), "Inv"); | |
779 } else { | |
780 _coarse_map.par_at_put(hrs_ind, 0); | |
781 } | |
782 // Check to see if any of the fcc entries come from here. | |
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783 uint hr_ind = hr()->hrs_index(); |
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784 for (uint tid = 0; tid < HeapRegionRemSet::num_par_rem_sets(); tid++) { |
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785 int fcc_ent = FromCardCache::at(tid, hr_ind); |
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786 if (fcc_ent != FromCardCache::InvalidCard) { |
342 | 787 HeapWord* card_addr = (HeapWord*) |
788 (uintptr_t(fcc_ent) << CardTableModRefBS::card_shift); | |
789 if (hr()->is_in_reserved(card_addr)) { | |
790 // Clear the from card cache. | |
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791 FromCardCache::set(tid, hr_ind, FromCardCache::InvalidCard); |
342 | 792 } |
793 } | |
794 } | |
795 } | |
796 | |
797 bool OtherRegionsTable::del_single_region_table(size_t ind, | |
798 HeapRegion* hr) { | |
799 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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800 PerRegionTable** prev_addr = &_fine_grain_regions[ind]; |
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801 PerRegionTable* prt = *prev_addr; |
342 | 802 while (prt != NULL && prt->hr() != hr) { |
6253 | 803 prev_addr = prt->collision_list_next_addr(); |
804 prt = prt->collision_list_next(); | |
342 | 805 } |
806 if (prt != NULL) { | |
807 assert(prt->hr() == hr, "Loop postcondition."); | |
6253 | 808 *prev_addr = prt->collision_list_next(); |
809 unlink_from_all(prt); | |
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810 PerRegionTable::free(prt); |
342 | 811 _n_fine_entries--; |
812 return true; | |
813 } else { | |
814 return false; | |
815 } | |
816 } | |
817 | |
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818 bool OtherRegionsTable::contains_reference(OopOrNarrowOopStar from) const { |
342 | 819 // Cast away const in this case. |
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820 MutexLockerEx x((Mutex*)_m, Mutex::_no_safepoint_check_flag); |
342 | 821 return contains_reference_locked(from); |
822 } | |
823 | |
845
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824 bool OtherRegionsTable::contains_reference_locked(OopOrNarrowOopStar from) const { |
342 | 825 HeapRegion* hr = _g1h->heap_region_containing_raw(from); |
826 if (hr == NULL) return false; | |
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827 RegionIdx_t hr_ind = (RegionIdx_t) hr->hrs_index(); |
342 | 828 // Is this region in the coarse map? |
829 if (_coarse_map.at(hr_ind)) return true; | |
830 | |
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831 PerRegionTable* prt = find_region_table(hr_ind & _mod_max_fine_entries_mask, |
342 | 832 hr); |
833 if (prt != NULL) { | |
834 return prt->contains_reference(from); | |
835 | |
836 } else { | |
837 uintptr_t from_card = | |
838 (uintptr_t(from) >> CardTableModRefBS::card_shift); | |
839 uintptr_t hr_bot_card_index = | |
840 uintptr_t(hr->bottom()) >> CardTableModRefBS::card_shift; | |
841 assert(from_card >= hr_bot_card_index, "Inv"); | |
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842 CardIdx_t card_index = from_card - hr_bot_card_index; |
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843 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
942
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844 "Must be in range."); |
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845 return _sparse_table.contains_card(hr_ind, card_index); |
342 | 846 } |
847 } | |
848 | |
2173 | 849 void |
850 OtherRegionsTable::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
851 _sparse_table.do_cleanup_work(hrrs_cleanup_task); | |
852 } | |
853 | |
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854 // Determines how many threads can add records to an rset in parallel. |
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855 // This can be done by either mutator threads together with the |
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856 // concurrent refinement threads or GC threads. |
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857 uint HeapRegionRemSet::num_par_rem_sets() { |
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858 return MAX2(DirtyCardQueueSet::num_par_ids() + ConcurrentG1Refine::thread_num(), (uint)ParallelGCThreads); |
342 | 859 } |
860 | |
861 HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, | |
862 HeapRegion* hr) | |
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863 : _bosa(bosa), |
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864 _m(Mutex::leaf, FormatBuffer<128>("HeapRegionRemSet lock #"UINT32_FORMAT, hr->hrs_index()), true), |
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865 _code_roots(), _other_regions(hr, &_m) { |
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866 reset_for_par_iteration(); |
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867 } |
342 | 868 |
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869 void HeapRegionRemSet::setup_remset_size() { |
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870 // Setup sparse and fine-grain tables sizes. |
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871 // table_size = base * (log(region_size / 1M) + 1) |
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872 const int LOG_M = 20; |
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873 int region_size_log_mb = MAX2(HeapRegion::LogOfHRGrainBytes - LOG_M, 0); |
1261
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874 if (FLAG_IS_DEFAULT(G1RSetSparseRegionEntries)) { |
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875 G1RSetSparseRegionEntries = G1RSetSparseRegionEntriesBase * (region_size_log_mb + 1); |
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876 } |
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877 if (FLAG_IS_DEFAULT(G1RSetRegionEntries)) { |
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878 G1RSetRegionEntries = G1RSetRegionEntriesBase * (region_size_log_mb + 1); |
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879 } |
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880 guarantee(G1RSetSparseRegionEntries > 0 && G1RSetRegionEntries > 0 , "Sanity"); |
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881 } |
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882 |
342 | 883 bool HeapRegionRemSet::claim_iter() { |
884 if (_iter_state != Unclaimed) return false; | |
885 jint res = Atomic::cmpxchg(Claimed, (jint*)(&_iter_state), Unclaimed); | |
886 return (res == Unclaimed); | |
887 } | |
888 | |
889 void HeapRegionRemSet::set_iter_complete() { | |
890 _iter_state = Complete; | |
891 } | |
892 | |
893 bool HeapRegionRemSet::iter_is_complete() { | |
894 return _iter_state == Complete; | |
895 } | |
896 | |
897 #ifndef PRODUCT | |
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898 void HeapRegionRemSet::print() { |
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899 HeapRegionRemSetIterator iter(this); |
342 | 900 size_t card_index; |
901 while (iter.has_next(card_index)) { | |
902 HeapWord* card_start = | |
903 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
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904 gclog_or_tty->print_cr(" Card " PTR_FORMAT, card_start); |
342 | 905 } |
906 if (iter.n_yielded() != occupied()) { | |
907 gclog_or_tty->print_cr("Yielded disagrees with occupied:"); | |
908 gclog_or_tty->print_cr(" %6d yielded (%6d coarse, %6d fine).", | |
909 iter.n_yielded(), | |
910 iter.n_yielded_coarse(), iter.n_yielded_fine()); | |
911 gclog_or_tty->print_cr(" %6d occ (%6d coarse, %6d fine).", | |
912 occupied(), occ_coarse(), occ_fine()); | |
913 } | |
914 guarantee(iter.n_yielded() == occupied(), | |
915 "We should have yielded all the represented cards."); | |
916 } | |
917 #endif | |
918 | |
919 void HeapRegionRemSet::cleanup() { | |
920 SparsePRT::cleanup_all(); | |
921 } | |
922 | |
923 void HeapRegionRemSet::clear() { | |
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924 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); |
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925 clear_locked(); |
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926 } |
12080 | 927 |
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928 void HeapRegionRemSet::clear_locked() { |
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929 _code_roots.clear(); |
342 | 930 _other_regions.clear(); |
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931 assert(occupied_locked() == 0, "Should be clear."); |
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932 reset_for_par_iteration(); |
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933 } |
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934 |
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935 void HeapRegionRemSet::reset_for_par_iteration() { |
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936 _iter_state = Unclaimed; |
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937 _iter_claimed = 0; |
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938 // It's good to check this to make sure that the two methods are in sync. |
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939 assert(verify_ready_for_par_iteration(), "post-condition"); |
342 | 940 } |
941 | |
942 void HeapRegionRemSet::scrub(CardTableModRefBS* ctbs, | |
943 BitMap* region_bm, BitMap* card_bm) { | |
944 _other_regions.scrub(ctbs, region_bm, card_bm); | |
945 } | |
946 | |
12080 | 947 // Code roots support |
948 | |
949 void HeapRegionRemSet::add_strong_code_root(nmethod* nm) { | |
950 assert(nm != NULL, "sanity"); | |
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951 _code_roots.add(nm); |
12080 | 952 } |
953 | |
954 void HeapRegionRemSet::remove_strong_code_root(nmethod* nm) { | |
955 assert(nm != NULL, "sanity"); | |
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956 _code_roots.remove(nm); |
12080 | 957 // Check that there were no duplicates |
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958 guarantee(!_code_roots.contains(nm), "duplicate entry found"); |
12080 | 959 } |
960 | |
961 class NMethodMigrationOopClosure : public OopClosure { | |
962 G1CollectedHeap* _g1h; | |
963 HeapRegion* _from; | |
964 nmethod* _nm; | |
965 | |
966 uint _num_self_forwarded; | |
967 | |
968 template <class T> void do_oop_work(T* p) { | |
969 T heap_oop = oopDesc::load_heap_oop(p); | |
970 if (!oopDesc::is_null(heap_oop)) { | |
971 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
972 if (_from->is_in(obj)) { | |
973 // Reference still points into the source region. | |
974 // Since roots are immediately evacuated this means that | |
975 // we must have self forwarded the object | |
976 assert(obj->is_forwarded(), | |
977 err_msg("code roots should be immediately evacuated. " | |
978 "Ref: "PTR_FORMAT", " | |
979 "Obj: "PTR_FORMAT", " | |
980 "Region: "HR_FORMAT, | |
981 p, (void*) obj, HR_FORMAT_PARAMS(_from))); | |
982 assert(obj->forwardee() == obj, | |
983 err_msg("not self forwarded? obj = "PTR_FORMAT, (void*)obj)); | |
984 | |
985 // The object has been self forwarded. | |
986 // Note, if we're during an initial mark pause, there is | |
987 // no need to explicitly mark object. It will be marked | |
988 // during the regular evacuation failure handling code. | |
989 _num_self_forwarded++; | |
990 } else { | |
991 // The reference points into a promotion or to-space region | |
992 HeapRegion* to = _g1h->heap_region_containing(obj); | |
993 to->rem_set()->add_strong_code_root(_nm); | |
994 } | |
995 } | |
996 } | |
997 | |
998 public: | |
999 NMethodMigrationOopClosure(G1CollectedHeap* g1h, HeapRegion* from, nmethod* nm): | |
1000 _g1h(g1h), _from(from), _nm(nm), _num_self_forwarded(0) {} | |
1001 | |
1002 void do_oop(narrowOop* p) { do_oop_work(p); } | |
1003 void do_oop(oop* p) { do_oop_work(p); } | |
1004 | |
1005 uint retain() { return _num_self_forwarded > 0; } | |
1006 }; | |
1007 | |
1008 void HeapRegionRemSet::migrate_strong_code_roots() { | |
1009 assert(hr()->in_collection_set(), "only collection set regions"); | |
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1010 assert(!hr()->isHumongous(), |
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1011 err_msg("humongous region "HR_FORMAT" should not have been added to the collection set", |
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1012 HR_FORMAT_PARAMS(hr()))); |
12080 | 1013 |
1014 ResourceMark rm; | |
1015 | |
1016 // List of code blobs to retain for this region | |
1017 GrowableArray<nmethod*> to_be_retained(10); | |
1018 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1019 | |
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1020 while (!_code_roots.is_empty()) { |
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1021 nmethod *nm = _code_roots.pop(); |
12080 | 1022 if (nm != NULL) { |
1023 NMethodMigrationOopClosure oop_cl(g1h, hr(), nm); | |
1024 nm->oops_do(&oop_cl); | |
1025 if (oop_cl.retain()) { | |
1026 to_be_retained.push(nm); | |
1027 } | |
1028 } | |
1029 } | |
1030 | |
1031 // Now push any code roots we need to retain | |
1032 assert(to_be_retained.is_empty() || hr()->evacuation_failed(), | |
1033 "Retained nmethod list must be empty or " | |
1034 "evacuation of this region failed"); | |
1035 | |
1036 while (to_be_retained.is_nonempty()) { | |
1037 nmethod* nm = to_be_retained.pop(); | |
1038 assert(nm != NULL, "sanity"); | |
1039 add_strong_code_root(nm); | |
1040 } | |
1041 } | |
1042 | |
1043 void HeapRegionRemSet::strong_code_roots_do(CodeBlobClosure* blk) const { | |
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1044 _code_roots.nmethods_do(blk); |
12080 | 1045 } |
1046 | |
1047 size_t HeapRegionRemSet::strong_code_roots_mem_size() { | |
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1048 return _code_roots.mem_size(); |
12080 | 1049 } |
1050 | |
342 | 1051 //-------------------- Iteration -------------------- |
1052 | |
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1053 HeapRegionRemSetIterator:: HeapRegionRemSetIterator(HeapRegionRemSet* hrrs) : |
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1054 _hrrs(hrrs), |
342 | 1055 _g1h(G1CollectedHeap::heap()), |
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1056 _coarse_map(&hrrs->_other_regions._coarse_map), |
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1057 _fine_grain_regions(hrrs->_other_regions._fine_grain_regions), |
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1058 _bosa(hrrs->bosa()), |
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1059 _is(Sparse), |
342 | 1060 // Set these values so that we increment to the first region. |
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1061 _coarse_cur_region_index(-1), |
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1062 _coarse_cur_region_cur_card(HeapRegion::CardsPerRegion-1), |
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1063 _cur_region_cur_card(0), |
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1064 _fine_array_index(-1), |
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1065 _fine_cur_prt(NULL), |
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1066 _n_yielded_coarse(0), |
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1067 _n_yielded_fine(0), |
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1068 _n_yielded_sparse(0), |
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1069 _sparse_iter(&hrrs->_other_regions._sparse_table) {} |
342 | 1070 |
1071 bool HeapRegionRemSetIterator::coarse_has_next(size_t& card_index) { | |
1072 if (_hrrs->_other_regions._n_coarse_entries == 0) return false; | |
1073 // Go to the next card. | |
1074 _coarse_cur_region_cur_card++; | |
1075 // Was the last the last card in the current region? | |
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1076 if (_coarse_cur_region_cur_card == HeapRegion::CardsPerRegion) { |
342 | 1077 // Yes: find the next region. This may leave _coarse_cur_region_index |
1078 // Set to the last index, in which case there are no more coarse | |
1079 // regions. | |
1080 _coarse_cur_region_index = | |
1081 (int) _coarse_map->get_next_one_offset(_coarse_cur_region_index + 1); | |
1082 if ((size_t)_coarse_cur_region_index < _coarse_map->size()) { | |
1083 _coarse_cur_region_cur_card = 0; | |
1084 HeapWord* r_bot = | |
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1085 _g1h->region_at((uint) _coarse_cur_region_index)->bottom(); |
342 | 1086 _cur_region_card_offset = _bosa->index_for(r_bot); |
1087 } else { | |
1088 return false; | |
1089 } | |
1090 } | |
1091 // If we didn't return false above, then we can yield a card. | |
1092 card_index = _cur_region_card_offset + _coarse_cur_region_cur_card; | |
1093 return true; | |
1094 } | |
1095 | |
1096 void HeapRegionRemSetIterator::fine_find_next_non_null_prt() { | |
1097 // Otherwise, find the next bucket list in the array. | |
1098 _fine_array_index++; | |
1099 while (_fine_array_index < (int) OtherRegionsTable::_max_fine_entries) { | |
1100 _fine_cur_prt = _fine_grain_regions[_fine_array_index]; | |
1101 if (_fine_cur_prt != NULL) return; | |
1102 else _fine_array_index++; | |
1103 } | |
1104 assert(_fine_cur_prt == NULL, "Loop post"); | |
1105 } | |
1106 | |
1107 bool HeapRegionRemSetIterator::fine_has_next(size_t& card_index) { | |
1108 if (fine_has_next()) { | |
1109 _cur_region_cur_card = | |
1110 _fine_cur_prt->_bm.get_next_one_offset(_cur_region_cur_card + 1); | |
1111 } | |
1112 while (!fine_has_next()) { | |
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1113 if (_cur_region_cur_card == (size_t) HeapRegion::CardsPerRegion) { |
342 | 1114 _cur_region_cur_card = 0; |
6253 | 1115 _fine_cur_prt = _fine_cur_prt->collision_list_next(); |
342 | 1116 } |
1117 if (_fine_cur_prt == NULL) { | |
1118 fine_find_next_non_null_prt(); | |
1119 if (_fine_cur_prt == NULL) return false; | |
1120 } | |
1121 assert(_fine_cur_prt != NULL && _cur_region_cur_card == 0, | |
1122 "inv."); | |
1123 HeapWord* r_bot = | |
1124 _fine_cur_prt->hr()->bottom(); | |
1125 _cur_region_card_offset = _bosa->index_for(r_bot); | |
1126 _cur_region_cur_card = _fine_cur_prt->_bm.get_next_one_offset(0); | |
1127 } | |
1128 assert(fine_has_next(), "Or else we exited the loop via the return."); | |
1129 card_index = _cur_region_card_offset + _cur_region_cur_card; | |
1130 return true; | |
1131 } | |
1132 | |
1133 bool HeapRegionRemSetIterator::fine_has_next() { | |
1134 return | |
1135 _fine_cur_prt != NULL && | |
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1136 _cur_region_cur_card < HeapRegion::CardsPerRegion; |
342 | 1137 } |
1138 | |
1139 bool HeapRegionRemSetIterator::has_next(size_t& card_index) { | |
1140 switch (_is) { | |
1141 case Sparse: | |
1142 if (_sparse_iter.has_next(card_index)) { | |
1143 _n_yielded_sparse++; | |
1144 return true; | |
1145 } | |
1146 // Otherwise, deliberate fall-through | |
1147 _is = Fine; | |
1148 case Fine: | |
1149 if (fine_has_next(card_index)) { | |
1150 _n_yielded_fine++; | |
1151 return true; | |
1152 } | |
1153 // Otherwise, deliberate fall-through | |
1154 _is = Coarse; | |
1155 case Coarse: | |
1156 if (coarse_has_next(card_index)) { | |
1157 _n_yielded_coarse++; | |
1158 return true; | |
1159 } | |
1160 // Otherwise... | |
1161 break; | |
1162 } | |
1163 assert(ParallelGCThreads > 1 || | |
1164 n_yielded() == _hrrs->occupied(), | |
1165 "Should have yielded all the cards in the rem set " | |
1166 "(in the non-par case)."); | |
1167 return false; | |
1168 } | |
1169 | |
1170 | |
1171 | |
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1172 OopOrNarrowOopStar* HeapRegionRemSet::_recorded_oops = NULL; |
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1173 HeapWord** HeapRegionRemSet::_recorded_cards = NULL; |
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1174 HeapRegion** HeapRegionRemSet::_recorded_regions = NULL; |
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1175 int HeapRegionRemSet::_n_recorded = 0; |
342 | 1176 |
1177 HeapRegionRemSet::Event* HeapRegionRemSet::_recorded_events = NULL; | |
1178 int* HeapRegionRemSet::_recorded_event_index = NULL; | |
1179 int HeapRegionRemSet::_n_recorded_events = 0; | |
1180 | |
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1181 void HeapRegionRemSet::record(HeapRegion* hr, OopOrNarrowOopStar f) { |
342 | 1182 if (_recorded_oops == NULL) { |
1183 assert(_n_recorded == 0 | |
1184 && _recorded_cards == NULL | |
1185 && _recorded_regions == NULL, | |
1186 "Inv"); | |
6197 | 1187 _recorded_oops = NEW_C_HEAP_ARRAY(OopOrNarrowOopStar, MaxRecorded, mtGC); |
1188 _recorded_cards = NEW_C_HEAP_ARRAY(HeapWord*, MaxRecorded, mtGC); | |
1189 _recorded_regions = NEW_C_HEAP_ARRAY(HeapRegion*, MaxRecorded, mtGC); | |
342 | 1190 } |
1191 if (_n_recorded == MaxRecorded) { | |
1192 gclog_or_tty->print_cr("Filled up 'recorded' (%d).", MaxRecorded); | |
1193 } else { | |
1194 _recorded_cards[_n_recorded] = | |
1195 (HeapWord*)align_size_down(uintptr_t(f), | |
1196 CardTableModRefBS::card_size); | |
1197 _recorded_oops[_n_recorded] = f; | |
1198 _recorded_regions[_n_recorded] = hr; | |
1199 _n_recorded++; | |
1200 } | |
1201 } | |
1202 | |
1203 void HeapRegionRemSet::record_event(Event evnt) { | |
1204 if (!G1RecordHRRSEvents) return; | |
1205 | |
1206 if (_recorded_events == NULL) { | |
1207 assert(_n_recorded_events == 0 | |
1208 && _recorded_event_index == NULL, | |
1209 "Inv"); | |
6197 | 1210 _recorded_events = NEW_C_HEAP_ARRAY(Event, MaxRecordedEvents, mtGC); |
1211 _recorded_event_index = NEW_C_HEAP_ARRAY(int, MaxRecordedEvents, mtGC); | |
342 | 1212 } |
1213 if (_n_recorded_events == MaxRecordedEvents) { | |
1214 gclog_or_tty->print_cr("Filled up 'recorded_events' (%d).", MaxRecordedEvents); | |
1215 } else { | |
1216 _recorded_events[_n_recorded_events] = evnt; | |
1217 _recorded_event_index[_n_recorded_events] = _n_recorded; | |
1218 _n_recorded_events++; | |
1219 } | |
1220 } | |
1221 | |
1222 void HeapRegionRemSet::print_event(outputStream* str, Event evnt) { | |
1223 switch (evnt) { | |
1224 case Event_EvacStart: | |
1225 str->print("Evac Start"); | |
1226 break; | |
1227 case Event_EvacEnd: | |
1228 str->print("Evac End"); | |
1229 break; | |
1230 case Event_RSUpdateEnd: | |
1231 str->print("RS Update End"); | |
1232 break; | |
1233 } | |
1234 } | |
1235 | |
1236 void HeapRegionRemSet::print_recorded() { | |
1237 int cur_evnt = 0; | |
1238 Event cur_evnt_kind; | |
1239 int cur_evnt_ind = 0; | |
1240 if (_n_recorded_events > 0) { | |
1241 cur_evnt_kind = _recorded_events[cur_evnt]; | |
1242 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
1243 } | |
1244 | |
1245 for (int i = 0; i < _n_recorded; i++) { | |
1246 while (cur_evnt < _n_recorded_events && i == cur_evnt_ind) { | |
1247 gclog_or_tty->print("Event: "); | |
1248 print_event(gclog_or_tty, cur_evnt_kind); | |
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1249 gclog_or_tty->cr(); |
342 | 1250 cur_evnt++; |
1251 if (cur_evnt < MaxRecordedEvents) { | |
1252 cur_evnt_kind = _recorded_events[cur_evnt]; | |
1253 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
1254 } | |
1255 } | |
1256 gclog_or_tty->print("Added card " PTR_FORMAT " to region [" PTR_FORMAT "...]" | |
1257 " for ref " PTR_FORMAT ".\n", | |
1258 _recorded_cards[i], _recorded_regions[i]->bottom(), | |
1259 _recorded_oops[i]); | |
1260 } | |
1261 } | |
1262 | |
2173 | 1263 void HeapRegionRemSet::reset_for_cleanup_tasks() { |
1264 SparsePRT::reset_for_cleanup_tasks(); | |
1265 } | |
1266 | |
1267 void HeapRegionRemSet::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
1268 _other_regions.do_cleanup_work(hrrs_cleanup_task); | |
1269 } | |
1270 | |
1271 void | |
1272 HeapRegionRemSet::finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task) { | |
1273 SparsePRT::finish_cleanup_task(hrrs_cleanup_task); | |
1274 } | |
1275 | |
342 | 1276 #ifndef PRODUCT |
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1277 void PerRegionTable::test_fl_mem_size() { |
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1278 PerRegionTable* dummy = alloc(NULL); |
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1279 free(dummy); |
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1280 guarantee(dummy->mem_size() == fl_mem_size(), "fl_mem_size() does not return the correct element size"); |
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1281 // try to reset the state |
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1282 _free_list = NULL; |
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1283 delete dummy; |
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1284 } |
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1285 |
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1286 void HeapRegionRemSet::test_prt() { |
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1287 PerRegionTable::test_fl_mem_size(); |
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1288 } |
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1289 |
342 | 1290 void HeapRegionRemSet::test() { |
1291 os::sleep(Thread::current(), (jlong)5000, false); | |
1292 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1293 | |
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1294 // Run with "-XX:G1LogRSetRegionEntries=2", so that 1 and 5 end up in same |
342 | 1295 // hash bucket. |
1296 HeapRegion* hr0 = g1h->region_at(0); | |
1297 HeapRegion* hr1 = g1h->region_at(1); | |
1298 HeapRegion* hr2 = g1h->region_at(5); | |
1299 HeapRegion* hr3 = g1h->region_at(6); | |
1300 HeapRegion* hr4 = g1h->region_at(7); | |
1301 HeapRegion* hr5 = g1h->region_at(8); | |
1302 | |
1303 HeapWord* hr1_start = hr1->bottom(); | |
1304 HeapWord* hr1_mid = hr1_start + HeapRegion::GrainWords/2; | |
1305 HeapWord* hr1_last = hr1->end() - 1; | |
1306 | |
1307 HeapWord* hr2_start = hr2->bottom(); | |
1308 HeapWord* hr2_mid = hr2_start + HeapRegion::GrainWords/2; | |
1309 HeapWord* hr2_last = hr2->end() - 1; | |
1310 | |
1311 HeapWord* hr3_start = hr3->bottom(); | |
1312 HeapWord* hr3_mid = hr3_start + HeapRegion::GrainWords/2; | |
1313 HeapWord* hr3_last = hr3->end() - 1; | |
1314 | |
1315 HeapRegionRemSet* hrrs = hr0->rem_set(); | |
1316 | |
1317 // Make three references from region 0x101... | |
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1318 hrrs->add_reference((OopOrNarrowOopStar)hr1_start); |
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1319 hrrs->add_reference((OopOrNarrowOopStar)hr1_mid); |
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1320 hrrs->add_reference((OopOrNarrowOopStar)hr1_last); |
342 | 1321 |
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1322 hrrs->add_reference((OopOrNarrowOopStar)hr2_start); |
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1323 hrrs->add_reference((OopOrNarrowOopStar)hr2_mid); |
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1324 hrrs->add_reference((OopOrNarrowOopStar)hr2_last); |
342 | 1325 |
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1326 hrrs->add_reference((OopOrNarrowOopStar)hr3_start); |
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1327 hrrs->add_reference((OopOrNarrowOopStar)hr3_mid); |
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1328 hrrs->add_reference((OopOrNarrowOopStar)hr3_last); |
342 | 1329 |
1330 // Now cause a coarsening. | |
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1331 hrrs->add_reference((OopOrNarrowOopStar)hr4->bottom()); |
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1332 hrrs->add_reference((OopOrNarrowOopStar)hr5->bottom()); |
342 | 1333 |
1334 // Now, does iteration yield these three? | |
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1335 HeapRegionRemSetIterator iter(hrrs); |
342 | 1336 size_t sum = 0; |
1337 size_t card_index; | |
1338 while (iter.has_next(card_index)) { | |
1339 HeapWord* card_start = | |
1340 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
1341 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); | |
1342 sum++; | |
1343 } | |
1344 guarantee(sum == 11 - 3 + 2048, "Failure"); | |
1345 guarantee(sum == hrrs->occupied(), "Failure"); | |
1346 } | |
1347 #endif |