Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp @ 21645:7eb156f30b61
Merge.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Mon, 01 Jun 2015 22:13:10 +0200 |
parents | 7baf47cb97cb |
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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" | |
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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 | |
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 { | |
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172 return sizeof(PerRegionTable) + _bm.size_in_words() * HeapWordSize; |
342 | 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, |
20360 | 291 mtGC, CURRENT_PC, 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 |
20337 | 375 invalidate(0, _max_regions); |
342 | 376 } |
377 | |
20337 | 378 void FromCardCache::invalidate(uint start_idx, size_t new_num_regions) { |
379 guarantee((size_t)start_idx + new_num_regions <= max_uintx, | |
380 err_msg("Trying to invalidate beyond maximum region, from %u size "SIZE_FORMAT, | |
381 start_idx, new_num_regions)); | |
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382 for (uint i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { |
20337 | 383 uint end_idx = (start_idx + (uint)new_num_regions); |
384 assert(end_idx <= _max_regions, "Must be within max."); | |
385 for (uint j = start_idx; j < end_idx; 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 |
20337 | 409 void OtherRegionsTable::initialize(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 |
20337 | 413 void OtherRegionsTable::invalidate(uint start_idx, size_t num_regions) { |
414 FromCardCache::invalidate(start_idx, 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_hrm_ind = hr()->hrm_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_hrm_ind)); |
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438 } |
342 | 439 |
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440 if (FromCardCache::contains_or_replace((uint)tid, cur_hrm_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_hrm_ind = (RegionIdx_t) from_hr->hrm_index(); |
342 | 451 |
452 // If the region is already coarsened, return. | |
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453 if (_coarse_map.at(from_hrm_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. | |
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462 size_t ind = from_hrm_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_hrm_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: %u)", |
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497 tid, from_hrm_ind, cur_hrm_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_hrm_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_hrm_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_hrm_index = (size_t) max->hr()->hrm_index(); |
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610 if (!_coarse_map.at(max_hrm_index)) { |
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611 _coarse_map.at_put(max_hrm_index, true); |
342 | 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()->hrm_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:", |
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658 cur->hr()->hrm_index()); |
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659 } |
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660 if (!region_bm->at((size_t) cur->hr()->hrm_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 | |
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697 bool OtherRegionsTable::is_empty() const { |
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698 return occ_sparse() == 0 && occ_coarse() == 0 && _first_all_fine_prts == NULL; |
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699 } |
342 | 700 |
701 size_t OtherRegionsTable::occupied() const { | |
702 size_t sum = occ_fine(); | |
703 sum += occ_sparse(); | |
704 sum += occ_coarse(); | |
705 return sum; | |
706 } | |
707 | |
708 size_t OtherRegionsTable::occ_fine() const { | |
709 size_t sum = 0; | |
6253 | 710 |
711 size_t num = 0; | |
712 PerRegionTable * cur = _first_all_fine_prts; | |
713 while (cur != NULL) { | |
714 sum += cur->occupied(); | |
715 cur = cur->next(); | |
716 num++; | |
342 | 717 } |
6253 | 718 guarantee(num == _n_fine_entries, "just checking"); |
342 | 719 return sum; |
720 } | |
721 | |
722 size_t OtherRegionsTable::occ_coarse() const { | |
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723 return (_n_coarse_entries * HeapRegion::CardsPerRegion); |
342 | 724 } |
725 | |
726 size_t OtherRegionsTable::occ_sparse() const { | |
727 return _sparse_table.occupied(); | |
728 } | |
729 | |
730 size_t OtherRegionsTable::mem_size() const { | |
731 size_t sum = 0; | |
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732 // all PRTs are of the same size so it is sufficient to query only one of them. |
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733 if (_first_all_fine_prts != NULL) { |
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734 assert(_last_all_fine_prts != NULL && |
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735 _first_all_fine_prts->mem_size() == _last_all_fine_prts->mem_size(), "check that mem_size() is constant"); |
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736 sum += _first_all_fine_prts->mem_size() * _n_fine_entries; |
342 | 737 } |
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738 sum += (sizeof(PerRegionTable*) * _max_fine_entries); |
342 | 739 sum += (_coarse_map.size_in_words() * HeapWordSize); |
740 sum += (_sparse_table.mem_size()); | |
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741 sum += sizeof(OtherRegionsTable) - sizeof(_sparse_table); // Avoid double counting above. |
342 | 742 return sum; |
743 } | |
744 | |
745 size_t OtherRegionsTable::static_mem_size() { | |
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746 return FromCardCache::static_mem_size(); |
342 | 747 } |
748 | |
749 size_t OtherRegionsTable::fl_mem_size() { | |
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750 return PerRegionTable::fl_mem_size(); |
342 | 751 } |
752 | |
753 void OtherRegionsTable::clear_fcc() { | |
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754 FromCardCache::clear(hr()->hrm_index()); |
342 | 755 } |
756 | |
757 void OtherRegionsTable::clear() { | |
6253 | 758 // if there are no entries, skip this step |
759 if (_first_all_fine_prts != NULL) { | |
760 guarantee(_first_all_fine_prts != NULL && _last_all_fine_prts != NULL, "just checking"); | |
761 PerRegionTable::bulk_free(_first_all_fine_prts, _last_all_fine_prts); | |
762 memset(_fine_grain_regions, 0, _max_fine_entries * sizeof(_fine_grain_regions[0])); | |
763 } else { | |
764 guarantee(_first_all_fine_prts == NULL && _last_all_fine_prts == NULL, "just checking"); | |
342 | 765 } |
6253 | 766 |
767 _first_all_fine_prts = _last_all_fine_prts = NULL; | |
342 | 768 _sparse_table.clear(); |
769 _coarse_map.clear(); | |
770 _n_fine_entries = 0; | |
771 _n_coarse_entries = 0; | |
772 | |
773 clear_fcc(); | |
774 } | |
775 | |
776 bool OtherRegionsTable::del_single_region_table(size_t ind, | |
777 HeapRegion* hr) { | |
778 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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779 PerRegionTable** prev_addr = &_fine_grain_regions[ind]; |
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780 PerRegionTable* prt = *prev_addr; |
342 | 781 while (prt != NULL && prt->hr() != hr) { |
6253 | 782 prev_addr = prt->collision_list_next_addr(); |
783 prt = prt->collision_list_next(); | |
342 | 784 } |
785 if (prt != NULL) { | |
786 assert(prt->hr() == hr, "Loop postcondition."); | |
6253 | 787 *prev_addr = prt->collision_list_next(); |
788 unlink_from_all(prt); | |
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789 PerRegionTable::free(prt); |
342 | 790 _n_fine_entries--; |
791 return true; | |
792 } else { | |
793 return false; | |
794 } | |
795 } | |
796 | |
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797 bool OtherRegionsTable::contains_reference(OopOrNarrowOopStar from) const { |
342 | 798 // Cast away const in this case. |
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799 MutexLockerEx x((Mutex*)_m, Mutex::_no_safepoint_check_flag); |
342 | 800 return contains_reference_locked(from); |
801 } | |
802 | |
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803 bool OtherRegionsTable::contains_reference_locked(OopOrNarrowOopStar from) const { |
342 | 804 HeapRegion* hr = _g1h->heap_region_containing_raw(from); |
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805 RegionIdx_t hr_ind = (RegionIdx_t) hr->hrm_index(); |
342 | 806 // Is this region in the coarse map? |
807 if (_coarse_map.at(hr_ind)) return true; | |
808 | |
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809 PerRegionTable* prt = find_region_table(hr_ind & _mod_max_fine_entries_mask, |
342 | 810 hr); |
811 if (prt != NULL) { | |
812 return prt->contains_reference(from); | |
813 | |
814 } else { | |
815 uintptr_t from_card = | |
816 (uintptr_t(from) >> CardTableModRefBS::card_shift); | |
817 uintptr_t hr_bot_card_index = | |
818 uintptr_t(hr->bottom()) >> CardTableModRefBS::card_shift; | |
819 assert(from_card >= hr_bot_card_index, "Inv"); | |
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820 CardIdx_t card_index = from_card - hr_bot_card_index; |
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821 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
942
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822 "Must be in range."); |
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823 return _sparse_table.contains_card(hr_ind, card_index); |
342 | 824 } |
825 } | |
826 | |
2173 | 827 void |
828 OtherRegionsTable::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
829 _sparse_table.do_cleanup_work(hrrs_cleanup_task); | |
830 } | |
831 | |
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832 // Determines how many threads can add records to an rset in parallel. |
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833 // This can be done by either mutator threads together with the |
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834 // concurrent refinement threads or GC threads. |
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835 uint HeapRegionRemSet::num_par_rem_sets() { |
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836 return MAX2(DirtyCardQueueSet::num_par_ids() + ConcurrentG1Refine::thread_num(), (uint)ParallelGCThreads); |
342 | 837 } |
838 | |
839 HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, | |
840 HeapRegion* hr) | |
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841 : _bosa(bosa), |
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842 _m(Mutex::leaf, FormatBuffer<128>("HeapRegionRemSet lock #%u", hr->hrm_index()), true), |
20337 | 843 _code_roots(), _other_regions(hr, &_m), _iter_state(Unclaimed), _iter_claimed(0) { |
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844 reset_for_par_iteration(); |
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845 } |
342 | 846 |
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847 void HeapRegionRemSet::setup_remset_size() { |
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848 // Setup sparse and fine-grain tables sizes. |
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849 // table_size = base * (log(region_size / 1M) + 1) |
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850 const int LOG_M = 20; |
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851 int region_size_log_mb = MAX2(HeapRegion::LogOfHRGrainBytes - LOG_M, 0); |
1261
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852 if (FLAG_IS_DEFAULT(G1RSetSparseRegionEntries)) { |
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853 G1RSetSparseRegionEntries = G1RSetSparseRegionEntriesBase * (region_size_log_mb + 1); |
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854 } |
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855 if (FLAG_IS_DEFAULT(G1RSetRegionEntries)) { |
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856 G1RSetRegionEntries = G1RSetRegionEntriesBase * (region_size_log_mb + 1); |
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857 } |
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858 guarantee(G1RSetSparseRegionEntries > 0 && G1RSetRegionEntries > 0 , "Sanity"); |
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859 } |
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860 |
342 | 861 bool HeapRegionRemSet::claim_iter() { |
862 if (_iter_state != Unclaimed) return false; | |
863 jint res = Atomic::cmpxchg(Claimed, (jint*)(&_iter_state), Unclaimed); | |
864 return (res == Unclaimed); | |
865 } | |
866 | |
867 void HeapRegionRemSet::set_iter_complete() { | |
868 _iter_state = Complete; | |
869 } | |
870 | |
871 bool HeapRegionRemSet::iter_is_complete() { | |
872 return _iter_state == Complete; | |
873 } | |
874 | |
875 #ifndef PRODUCT | |
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876 void HeapRegionRemSet::print() { |
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877 HeapRegionRemSetIterator iter(this); |
342 | 878 size_t card_index; |
879 while (iter.has_next(card_index)) { | |
880 HeapWord* card_start = | |
881 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
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882 gclog_or_tty->print_cr(" Card " PTR_FORMAT, card_start); |
342 | 883 } |
884 if (iter.n_yielded() != occupied()) { | |
885 gclog_or_tty->print_cr("Yielded disagrees with occupied:"); | |
886 gclog_or_tty->print_cr(" %6d yielded (%6d coarse, %6d fine).", | |
887 iter.n_yielded(), | |
888 iter.n_yielded_coarse(), iter.n_yielded_fine()); | |
889 gclog_or_tty->print_cr(" %6d occ (%6d coarse, %6d fine).", | |
890 occupied(), occ_coarse(), occ_fine()); | |
891 } | |
892 guarantee(iter.n_yielded() == occupied(), | |
893 "We should have yielded all the represented cards."); | |
894 } | |
895 #endif | |
896 | |
897 void HeapRegionRemSet::cleanup() { | |
898 SparsePRT::cleanup_all(); | |
899 } | |
900 | |
901 void HeapRegionRemSet::clear() { | |
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902 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); |
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903 clear_locked(); |
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904 } |
12080 | 905 |
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906 void HeapRegionRemSet::clear_locked() { |
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907 _code_roots.clear(); |
342 | 908 _other_regions.clear(); |
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909 assert(occupied_locked() == 0, "Should be clear."); |
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910 reset_for_par_iteration(); |
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911 } |
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912 |
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913 void HeapRegionRemSet::reset_for_par_iteration() { |
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914 _iter_state = Unclaimed; |
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915 _iter_claimed = 0; |
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916 // It's good to check this to make sure that the two methods are in sync. |
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917 assert(verify_ready_for_par_iteration(), "post-condition"); |
342 | 918 } |
919 | |
920 void HeapRegionRemSet::scrub(CardTableModRefBS* ctbs, | |
921 BitMap* region_bm, BitMap* card_bm) { | |
922 _other_regions.scrub(ctbs, region_bm, card_bm); | |
923 } | |
924 | |
12080 | 925 // Code roots support |
20494 | 926 // |
927 // The code root set is protected by two separate locking schemes | |
928 // When at safepoint the per-hrrs lock must be held during modifications | |
929 // except when doing a full gc. | |
930 // When not at safepoint the CodeCache_lock must be held during modifications. | |
931 // When concurrent readers access the contains() function | |
932 // (during the evacuation phase) no removals are allowed. | |
12080 | 933 |
934 void HeapRegionRemSet::add_strong_code_root(nmethod* nm) { | |
935 assert(nm != NULL, "sanity"); | |
20494 | 936 // Optimistic unlocked contains-check |
937 if (!_code_roots.contains(nm)) { | |
938 MutexLockerEx ml(&_m, Mutex::_no_safepoint_check_flag); | |
939 add_strong_code_root_locked(nm); | |
940 } | |
941 } | |
942 | |
943 void HeapRegionRemSet::add_strong_code_root_locked(nmethod* nm) { | |
944 assert(nm != NULL, "sanity"); | |
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945 _code_roots.add(nm); |
12080 | 946 } |
947 | |
948 void HeapRegionRemSet::remove_strong_code_root(nmethod* nm) { | |
949 assert(nm != NULL, "sanity"); | |
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950 assert_locked_or_safepoint(CodeCache_lock); |
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951 |
20494 | 952 MutexLockerEx ml(CodeCache_lock->owned_by_self() ? NULL : &_m, Mutex::_no_safepoint_check_flag); |
953 _code_roots.remove(nm); | |
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954 |
12080 | 955 // Check that there were no duplicates |
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956 guarantee(!_code_roots.contains(nm), "duplicate entry found"); |
12080 | 957 } |
958 | |
20494 | 959 void HeapRegionRemSet::strong_code_roots_do(CodeBlobClosure* blk) const { |
960 _code_roots.nmethods_do(blk); | |
12080 | 961 } |
962 | |
20494 | 963 void HeapRegionRemSet::clean_strong_code_roots(HeapRegion* hr) { |
964 _code_roots.clean(hr); | |
12080 | 965 } |
966 | |
967 size_t HeapRegionRemSet::strong_code_roots_mem_size() { | |
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968 return _code_roots.mem_size(); |
12080 | 969 } |
970 | |
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971 HeapRegionRemSetIterator:: HeapRegionRemSetIterator(HeapRegionRemSet* hrrs) : |
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972 _hrrs(hrrs), |
342 | 973 _g1h(G1CollectedHeap::heap()), |
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974 _coarse_map(&hrrs->_other_regions._coarse_map), |
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975 _bosa(hrrs->bosa()), |
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976 _is(Sparse), |
342 | 977 // Set these values so that we increment to the first region. |
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978 _coarse_cur_region_index(-1), |
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979 _coarse_cur_region_cur_card(HeapRegion::CardsPerRegion-1), |
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980 _cur_card_in_prt(HeapRegion::CardsPerRegion), |
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981 _fine_cur_prt(NULL), |
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982 _n_yielded_coarse(0), |
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983 _n_yielded_fine(0), |
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984 _n_yielded_sparse(0), |
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985 _sparse_iter(&hrrs->_other_regions._sparse_table) {} |
342 | 986 |
987 bool HeapRegionRemSetIterator::coarse_has_next(size_t& card_index) { | |
988 if (_hrrs->_other_regions._n_coarse_entries == 0) return false; | |
989 // Go to the next card. | |
990 _coarse_cur_region_cur_card++; | |
991 // Was the last the last card in the current region? | |
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992 if (_coarse_cur_region_cur_card == HeapRegion::CardsPerRegion) { |
342 | 993 // Yes: find the next region. This may leave _coarse_cur_region_index |
994 // Set to the last index, in which case there are no more coarse | |
995 // regions. | |
996 _coarse_cur_region_index = | |
997 (int) _coarse_map->get_next_one_offset(_coarse_cur_region_index + 1); | |
998 if ((size_t)_coarse_cur_region_index < _coarse_map->size()) { | |
999 _coarse_cur_region_cur_card = 0; | |
1000 HeapWord* r_bot = | |
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1001 _g1h->region_at((uint) _coarse_cur_region_index)->bottom(); |
342 | 1002 _cur_region_card_offset = _bosa->index_for(r_bot); |
1003 } else { | |
1004 return false; | |
1005 } | |
1006 } | |
1007 // If we didn't return false above, then we can yield a card. | |
1008 card_index = _cur_region_card_offset + _coarse_cur_region_cur_card; | |
1009 return true; | |
1010 } | |
1011 | |
1012 bool HeapRegionRemSetIterator::fine_has_next(size_t& card_index) { | |
1013 if (fine_has_next()) { | |
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1014 _cur_card_in_prt = |
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1015 _fine_cur_prt->_bm.get_next_one_offset(_cur_card_in_prt + 1); |
342 | 1016 } |
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1017 if (_cur_card_in_prt == HeapRegion::CardsPerRegion) { |
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1018 // _fine_cur_prt may still be NULL in case if there are not PRTs at all for |
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1019 // the remembered set. |
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1020 if (_fine_cur_prt == NULL || _fine_cur_prt->next() == NULL) { |
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1021 return false; |
342 | 1022 } |
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1023 PerRegionTable* next_prt = _fine_cur_prt->next(); |
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1024 switch_to_prt(next_prt); |
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1025 _cur_card_in_prt = _fine_cur_prt->_bm.get_next_one_offset(_cur_card_in_prt + 1); |
342 | 1026 } |
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1027 |
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1028 card_index = _cur_region_card_offset + _cur_card_in_prt; |
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1029 guarantee(_cur_card_in_prt < HeapRegion::CardsPerRegion, |
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1030 err_msg("Card index "SIZE_FORMAT" must be within the region", _cur_card_in_prt)); |
342 | 1031 return true; |
1032 } | |
1033 | |
1034 bool HeapRegionRemSetIterator::fine_has_next() { | |
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1035 return _cur_card_in_prt != HeapRegion::CardsPerRegion; |
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1036 } |
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1037 |
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1038 void HeapRegionRemSetIterator::switch_to_prt(PerRegionTable* prt) { |
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1039 assert(prt != NULL, "Cannot switch to NULL prt"); |
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1040 _fine_cur_prt = prt; |
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1041 |
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1042 HeapWord* r_bot = _fine_cur_prt->hr()->bottom(); |
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1043 _cur_region_card_offset = _bosa->index_for(r_bot); |
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1044 |
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1045 // The bitmap scan for the PRT always scans from _cur_region_cur_card + 1. |
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1046 // To avoid special-casing this start case, and not miss the first bitmap |
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1047 // entry, initialize _cur_region_cur_card with -1 instead of 0. |
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1048 _cur_card_in_prt = (size_t)-1; |
342 | 1049 } |
1050 | |
1051 bool HeapRegionRemSetIterator::has_next(size_t& card_index) { | |
1052 switch (_is) { | |
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1053 case Sparse: { |
342 | 1054 if (_sparse_iter.has_next(card_index)) { |
1055 _n_yielded_sparse++; | |
1056 return true; | |
1057 } | |
1058 // Otherwise, deliberate fall-through | |
1059 _is = Fine; | |
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1060 PerRegionTable* initial_fine_prt = _hrrs->_other_regions._first_all_fine_prts; |
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1061 if (initial_fine_prt != NULL) { |
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1062 switch_to_prt(_hrrs->_other_regions._first_all_fine_prts); |
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1063 } |
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1064 } |
342 | 1065 case Fine: |
1066 if (fine_has_next(card_index)) { | |
1067 _n_yielded_fine++; | |
1068 return true; | |
1069 } | |
1070 // Otherwise, deliberate fall-through | |
1071 _is = Coarse; | |
1072 case Coarse: | |
1073 if (coarse_has_next(card_index)) { | |
1074 _n_yielded_coarse++; | |
1075 return true; | |
1076 } | |
1077 // Otherwise... | |
1078 break; | |
1079 } | |
1080 assert(ParallelGCThreads > 1 || | |
1081 n_yielded() == _hrrs->occupied(), | |
1082 "Should have yielded all the cards in the rem set " | |
1083 "(in the non-par case)."); | |
1084 return false; | |
1085 } | |
1086 | |
1087 | |
1088 | |
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1089 OopOrNarrowOopStar* HeapRegionRemSet::_recorded_oops = NULL; |
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1090 HeapWord** HeapRegionRemSet::_recorded_cards = NULL; |
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1091 HeapRegion** HeapRegionRemSet::_recorded_regions = NULL; |
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1092 int HeapRegionRemSet::_n_recorded = 0; |
342 | 1093 |
1094 HeapRegionRemSet::Event* HeapRegionRemSet::_recorded_events = NULL; | |
1095 int* HeapRegionRemSet::_recorded_event_index = NULL; | |
1096 int HeapRegionRemSet::_n_recorded_events = 0; | |
1097 | |
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1098 void HeapRegionRemSet::record(HeapRegion* hr, OopOrNarrowOopStar f) { |
342 | 1099 if (_recorded_oops == NULL) { |
1100 assert(_n_recorded == 0 | |
1101 && _recorded_cards == NULL | |
1102 && _recorded_regions == NULL, | |
1103 "Inv"); | |
6197 | 1104 _recorded_oops = NEW_C_HEAP_ARRAY(OopOrNarrowOopStar, MaxRecorded, mtGC); |
1105 _recorded_cards = NEW_C_HEAP_ARRAY(HeapWord*, MaxRecorded, mtGC); | |
1106 _recorded_regions = NEW_C_HEAP_ARRAY(HeapRegion*, MaxRecorded, mtGC); | |
342 | 1107 } |
1108 if (_n_recorded == MaxRecorded) { | |
1109 gclog_or_tty->print_cr("Filled up 'recorded' (%d).", MaxRecorded); | |
1110 } else { | |
1111 _recorded_cards[_n_recorded] = | |
1112 (HeapWord*)align_size_down(uintptr_t(f), | |
1113 CardTableModRefBS::card_size); | |
1114 _recorded_oops[_n_recorded] = f; | |
1115 _recorded_regions[_n_recorded] = hr; | |
1116 _n_recorded++; | |
1117 } | |
1118 } | |
1119 | |
1120 void HeapRegionRemSet::record_event(Event evnt) { | |
1121 if (!G1RecordHRRSEvents) return; | |
1122 | |
1123 if (_recorded_events == NULL) { | |
1124 assert(_n_recorded_events == 0 | |
1125 && _recorded_event_index == NULL, | |
1126 "Inv"); | |
6197 | 1127 _recorded_events = NEW_C_HEAP_ARRAY(Event, MaxRecordedEvents, mtGC); |
1128 _recorded_event_index = NEW_C_HEAP_ARRAY(int, MaxRecordedEvents, mtGC); | |
342 | 1129 } |
1130 if (_n_recorded_events == MaxRecordedEvents) { | |
1131 gclog_or_tty->print_cr("Filled up 'recorded_events' (%d).", MaxRecordedEvents); | |
1132 } else { | |
1133 _recorded_events[_n_recorded_events] = evnt; | |
1134 _recorded_event_index[_n_recorded_events] = _n_recorded; | |
1135 _n_recorded_events++; | |
1136 } | |
1137 } | |
1138 | |
1139 void HeapRegionRemSet::print_event(outputStream* str, Event evnt) { | |
1140 switch (evnt) { | |
1141 case Event_EvacStart: | |
1142 str->print("Evac Start"); | |
1143 break; | |
1144 case Event_EvacEnd: | |
1145 str->print("Evac End"); | |
1146 break; | |
1147 case Event_RSUpdateEnd: | |
1148 str->print("RS Update End"); | |
1149 break; | |
1150 } | |
1151 } | |
1152 | |
1153 void HeapRegionRemSet::print_recorded() { | |
1154 int cur_evnt = 0; | |
1155 Event cur_evnt_kind; | |
1156 int cur_evnt_ind = 0; | |
1157 if (_n_recorded_events > 0) { | |
1158 cur_evnt_kind = _recorded_events[cur_evnt]; | |
1159 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
1160 } | |
1161 | |
1162 for (int i = 0; i < _n_recorded; i++) { | |
1163 while (cur_evnt < _n_recorded_events && i == cur_evnt_ind) { | |
1164 gclog_or_tty->print("Event: "); | |
1165 print_event(gclog_or_tty, cur_evnt_kind); | |
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1166 gclog_or_tty->cr(); |
342 | 1167 cur_evnt++; |
1168 if (cur_evnt < MaxRecordedEvents) { | |
1169 cur_evnt_kind = _recorded_events[cur_evnt]; | |
1170 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
1171 } | |
1172 } | |
1173 gclog_or_tty->print("Added card " PTR_FORMAT " to region [" PTR_FORMAT "...]" | |
1174 " for ref " PTR_FORMAT ".\n", | |
1175 _recorded_cards[i], _recorded_regions[i]->bottom(), | |
1176 _recorded_oops[i]); | |
1177 } | |
1178 } | |
1179 | |
2173 | 1180 void HeapRegionRemSet::reset_for_cleanup_tasks() { |
1181 SparsePRT::reset_for_cleanup_tasks(); | |
1182 } | |
1183 | |
1184 void HeapRegionRemSet::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
1185 _other_regions.do_cleanup_work(hrrs_cleanup_task); | |
1186 } | |
1187 | |
1188 void | |
1189 HeapRegionRemSet::finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task) { | |
1190 SparsePRT::finish_cleanup_task(hrrs_cleanup_task); | |
1191 } | |
1192 | |
342 | 1193 #ifndef PRODUCT |
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1194 void PerRegionTable::test_fl_mem_size() { |
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1195 PerRegionTable* dummy = alloc(NULL); |
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1196 |
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1197 size_t min_prt_size = sizeof(void*) + dummy->bm()->size_in_words() * HeapWordSize; |
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1198 assert(dummy->mem_size() > min_prt_size, |
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1199 err_msg("PerRegionTable memory usage is suspiciously small, only has "SIZE_FORMAT" bytes. " |
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1200 "Should be at least "SIZE_FORMAT" bytes.", dummy->mem_size(), min_prt_size)); |
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1201 free(dummy); |
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1202 guarantee(dummy->mem_size() == fl_mem_size(), "fl_mem_size() does not return the correct element size"); |
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1203 // try to reset the state |
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1204 _free_list = NULL; |
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1205 delete dummy; |
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1206 } |
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1207 |
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1208 void HeapRegionRemSet::test_prt() { |
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1209 PerRegionTable::test_fl_mem_size(); |
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1210 } |
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1211 |
342 | 1212 void HeapRegionRemSet::test() { |
1213 os::sleep(Thread::current(), (jlong)5000, false); | |
1214 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1215 | |
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1216 // Run with "-XX:G1LogRSetRegionEntries=2", so that 1 and 5 end up in same |
342 | 1217 // hash bucket. |
1218 HeapRegion* hr0 = g1h->region_at(0); | |
1219 HeapRegion* hr1 = g1h->region_at(1); | |
1220 HeapRegion* hr2 = g1h->region_at(5); | |
1221 HeapRegion* hr3 = g1h->region_at(6); | |
1222 HeapRegion* hr4 = g1h->region_at(7); | |
1223 HeapRegion* hr5 = g1h->region_at(8); | |
1224 | |
1225 HeapWord* hr1_start = hr1->bottom(); | |
1226 HeapWord* hr1_mid = hr1_start + HeapRegion::GrainWords/2; | |
1227 HeapWord* hr1_last = hr1->end() - 1; | |
1228 | |
1229 HeapWord* hr2_start = hr2->bottom(); | |
1230 HeapWord* hr2_mid = hr2_start + HeapRegion::GrainWords/2; | |
1231 HeapWord* hr2_last = hr2->end() - 1; | |
1232 | |
1233 HeapWord* hr3_start = hr3->bottom(); | |
1234 HeapWord* hr3_mid = hr3_start + HeapRegion::GrainWords/2; | |
1235 HeapWord* hr3_last = hr3->end() - 1; | |
1236 | |
1237 HeapRegionRemSet* hrrs = hr0->rem_set(); | |
1238 | |
1239 // Make three references from region 0x101... | |
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1240 hrrs->add_reference((OopOrNarrowOopStar)hr1_start); |
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1241 hrrs->add_reference((OopOrNarrowOopStar)hr1_mid); |
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1242 hrrs->add_reference((OopOrNarrowOopStar)hr1_last); |
342 | 1243 |
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1244 hrrs->add_reference((OopOrNarrowOopStar)hr2_start); |
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1245 hrrs->add_reference((OopOrNarrowOopStar)hr2_mid); |
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1246 hrrs->add_reference((OopOrNarrowOopStar)hr2_last); |
342 | 1247 |
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1248 hrrs->add_reference((OopOrNarrowOopStar)hr3_start); |
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1249 hrrs->add_reference((OopOrNarrowOopStar)hr3_mid); |
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1250 hrrs->add_reference((OopOrNarrowOopStar)hr3_last); |
342 | 1251 |
1252 // Now cause a coarsening. | |
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1253 hrrs->add_reference((OopOrNarrowOopStar)hr4->bottom()); |
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1254 hrrs->add_reference((OopOrNarrowOopStar)hr5->bottom()); |
342 | 1255 |
1256 // Now, does iteration yield these three? | |
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1257 HeapRegionRemSetIterator iter(hrrs); |
342 | 1258 size_t sum = 0; |
1259 size_t card_index; | |
1260 while (iter.has_next(card_index)) { | |
1261 HeapWord* card_start = | |
1262 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
1263 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); | |
1264 sum++; | |
1265 } | |
1266 guarantee(sum == 11 - 3 + 2048, "Failure"); | |
1267 guarantee(sum == hrrs->occupied(), "Failure"); | |
1268 } | |
1269 #endif |