Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp @ 17756:a07bea31ef35
8035398: Add card redirty time in "Other" time in G1
Summary: Show the time taken by card redirtying during GC in a new "Redirty Cards" line.
Reviewed-by: jwilhelm, brutisso
author | tschatzl |
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date | Mon, 24 Mar 2014 15:30:40 +0100 |
parents | 96b1c2e06e25 |
children | ae7336d6337e |
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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 |
6197 | 39 class PerRegionTable: public CHeapObj<mtGC> { |
342 | 40 friend class OtherRegionsTable; |
41 friend class HeapRegionRemSetIterator; | |
42 | |
43 HeapRegion* _hr; | |
44 BitMap _bm; | |
45 jint _occupied; | |
46 | |
6253 | 47 // next pointer for free/allocated 'all' list |
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48 PerRegionTable* _next; |
342 | 49 |
6253 | 50 // prev pointer for the allocated 'all' list |
51 PerRegionTable* _prev; | |
342 | 52 |
6253 | 53 // next pointer in collision list |
54 PerRegionTable * _collision_list_next; | |
342 | 55 |
6253 | 56 // Global free list of PRTs |
57 static PerRegionTable* _free_list; | |
342 | 58 |
59 protected: | |
60 // We need access in order to union things into the base table. | |
61 BitMap* bm() { return &_bm; } | |
62 | |
63 void recount_occupied() { | |
64 _occupied = (jint) bm()->count_one_bits(); | |
65 } | |
66 | |
67 PerRegionTable(HeapRegion* hr) : | |
68 _hr(hr), | |
69 _occupied(0), | |
6253 | 70 _bm(HeapRegion::CardsPerRegion, false /* in-resource-area */), |
71 _collision_list_next(NULL), _next(NULL), _prev(NULL) | |
342 | 72 {} |
73 | |
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74 void add_card_work(CardIdx_t from_card, bool par) { |
342 | 75 if (!_bm.at(from_card)) { |
76 if (par) { | |
77 if (_bm.par_at_put(from_card, 1)) { | |
78 Atomic::inc(&_occupied); | |
79 } | |
80 } else { | |
81 _bm.at_put(from_card, 1); | |
82 _occupied++; | |
83 } | |
84 } | |
85 } | |
86 | |
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87 void add_reference_work(OopOrNarrowOopStar from, bool par) { |
342 | 88 // Must make this robust in case "from" is not in "_hr", because of |
89 // concurrency. | |
90 | |
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91 if (G1TraceHeapRegionRememberedSet) { |
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92 gclog_or_tty->print_cr(" PRT::Add_reference_work(" PTR_FORMAT "->" PTR_FORMAT").", |
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93 from, |
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94 UseCompressedOops |
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95 ? (void *)oopDesc::load_decode_heap_oop((narrowOop*)from) |
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96 : (void *)oopDesc::load_decode_heap_oop((oop*)from)); |
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97 } |
342 | 98 |
99 HeapRegion* loc_hr = hr(); | |
100 // If the test below fails, then this table was reused concurrently | |
101 // with this operation. This is OK, since the old table was coarsened, | |
102 // and adding a bit to the new table is never incorrect. | |
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103 // If the table used to belong to a continues humongous region and is |
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104 // now reused for the corresponding start humongous region, we need to |
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105 // make sure that we detect this. Thus, we call is_in_reserved_raw() |
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106 // instead of just is_in_reserved() here. |
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107 if (loc_hr->is_in_reserved_raw(from)) { |
342 | 108 size_t hw_offset = pointer_delta((HeapWord*)from, loc_hr->bottom()); |
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109 CardIdx_t from_card = (CardIdx_t) |
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110 hw_offset >> (CardTableModRefBS::card_shift - LogHeapWordSize); |
342 | 111 |
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112 assert(0 <= from_card && (size_t)from_card < HeapRegion::CardsPerRegion, |
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113 "Must be in range."); |
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114 add_card_work(from_card, par); |
342 | 115 } |
116 } | |
117 | |
118 public: | |
119 | |
120 HeapRegion* hr() const { return _hr; } | |
121 | |
122 jint occupied() const { | |
123 // Overkill, but if we ever need it... | |
124 // guarantee(_occupied == _bm.count_one_bits(), "Check"); | |
125 return _occupied; | |
126 } | |
127 | |
6253 | 128 void init(HeapRegion* hr, bool clear_links_to_all_list) { |
129 if (clear_links_to_all_list) { | |
130 set_next(NULL); | |
131 set_prev(NULL); | |
132 } | |
342 | 133 _hr = hr; |
6253 | 134 _collision_list_next = NULL; |
342 | 135 _occupied = 0; |
136 _bm.clear(); | |
137 } | |
138 | |
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139 void add_reference(OopOrNarrowOopStar from) { |
342 | 140 add_reference_work(from, /*parallel*/ true); |
141 } | |
142 | |
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143 void seq_add_reference(OopOrNarrowOopStar from) { |
342 | 144 add_reference_work(from, /*parallel*/ false); |
145 } | |
146 | |
147 void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { | |
148 HeapWord* hr_bot = hr()->bottom(); | |
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149 size_t hr_first_card_index = ctbs->index_for(hr_bot); |
342 | 150 bm()->set_intersection_at_offset(*card_bm, hr_first_card_index); |
151 recount_occupied(); | |
152 } | |
153 | |
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154 void add_card(CardIdx_t from_card_index) { |
342 | 155 add_card_work(from_card_index, /*parallel*/ true); |
156 } | |
157 | |
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158 void seq_add_card(CardIdx_t from_card_index) { |
342 | 159 add_card_work(from_card_index, /*parallel*/ false); |
160 } | |
161 | |
162 // (Destructively) union the bitmap of the current table into the given | |
163 // bitmap (which is assumed to be of the same size.) | |
164 void union_bitmap_into(BitMap* bm) { | |
165 bm->set_union(_bm); | |
166 } | |
167 | |
168 // Mem size in bytes. | |
169 size_t mem_size() const { | |
170 return sizeof(this) + _bm.size_in_words() * HeapWordSize; | |
171 } | |
172 | |
173 // Requires "from" to be in "hr()". | |
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174 bool contains_reference(OopOrNarrowOopStar from) const { |
342 | 175 assert(hr()->is_in_reserved(from), "Precondition."); |
176 size_t card_ind = pointer_delta(from, hr()->bottom(), | |
177 CardTableModRefBS::card_size); | |
178 return _bm.at(card_ind); | |
179 } | |
180 | |
6253 | 181 // Bulk-free the PRTs from prt to last, assumes that they are |
182 // linked together using their _next field. | |
183 static void bulk_free(PerRegionTable* prt, PerRegionTable* last) { | |
342 | 184 while (true) { |
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185 PerRegionTable* fl = _free_list; |
6253 | 186 last->set_next(fl); |
187 PerRegionTable* res = (PerRegionTable*) Atomic::cmpxchg_ptr(prt, &_free_list, fl); | |
188 if (res == fl) { | |
189 return; | |
190 } | |
342 | 191 } |
192 ShouldNotReachHere(); | |
193 } | |
194 | |
6253 | 195 static void free(PerRegionTable* prt) { |
196 bulk_free(prt, prt); | |
197 } | |
198 | |
199 // Returns an initialized PerRegionTable instance. | |
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200 static PerRegionTable* alloc(HeapRegion* hr) { |
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201 PerRegionTable* fl = _free_list; |
342 | 202 while (fl != NULL) { |
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203 PerRegionTable* nxt = fl->next(); |
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204 PerRegionTable* res = |
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205 (PerRegionTable*) |
342 | 206 Atomic::cmpxchg_ptr(nxt, &_free_list, fl); |
207 if (res == fl) { | |
6253 | 208 fl->init(hr, true); |
342 | 209 return fl; |
210 } else { | |
211 fl = _free_list; | |
212 } | |
213 } | |
214 assert(fl == NULL, "Loop condition."); | |
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215 return new PerRegionTable(hr); |
342 | 216 } |
217 | |
6253 | 218 PerRegionTable* next() const { return _next; } |
219 void set_next(PerRegionTable* next) { _next = next; } | |
220 PerRegionTable* prev() const { return _prev; } | |
221 void set_prev(PerRegionTable* prev) { _prev = prev; } | |
222 | |
223 // Accessor and Modification routines for the pointer for the | |
224 // singly linked collision list that links the PRTs within the | |
225 // OtherRegionsTable::_fine_grain_regions hash table. | |
226 // | |
227 // It might be useful to also make the collision list doubly linked | |
228 // to avoid iteration over the collisions list during scrubbing/deletion. | |
229 // OTOH there might not be many collisions. | |
230 | |
231 PerRegionTable* collision_list_next() const { | |
232 return _collision_list_next; | |
233 } | |
234 | |
235 void set_collision_list_next(PerRegionTable* next) { | |
236 _collision_list_next = next; | |
237 } | |
238 | |
239 PerRegionTable** collision_list_next_addr() { | |
240 return &_collision_list_next; | |
241 } | |
242 | |
342 | 243 static size_t fl_mem_size() { |
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244 PerRegionTable* cur = _free_list; |
342 | 245 size_t res = 0; |
246 while (cur != NULL) { | |
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247 res += cur->mem_size(); |
342 | 248 cur = cur->next(); |
249 } | |
250 return res; | |
251 } | |
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252 |
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253 static void test_fl_mem_size(); |
342 | 254 }; |
255 | |
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256 PerRegionTable* PerRegionTable::_free_list = NULL; |
342 | 257 |
258 size_t OtherRegionsTable::_max_fine_entries = 0; | |
259 size_t OtherRegionsTable::_mod_max_fine_entries_mask = 0; | |
260 size_t OtherRegionsTable::_fine_eviction_stride = 0; | |
261 size_t OtherRegionsTable::_fine_eviction_sample_size = 0; | |
262 | |
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263 OtherRegionsTable::OtherRegionsTable(HeapRegion* hr, Mutex* m) : |
342 | 264 _g1h(G1CollectedHeap::heap()), |
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265 _hr(hr), _m(m), |
342 | 266 _coarse_map(G1CollectedHeap::heap()->max_regions(), |
267 false /* in-resource-area */), | |
268 _fine_grain_regions(NULL), | |
6253 | 269 _first_all_fine_prts(NULL), _last_all_fine_prts(NULL), |
342 | 270 _n_fine_entries(0), _n_coarse_entries(0), |
271 _fine_eviction_start(0), | |
272 _sparse_table(hr) | |
273 { | |
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274 typedef PerRegionTable* PerRegionTablePtr; |
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275 |
342 | 276 if (_max_fine_entries == 0) { |
277 assert(_mod_max_fine_entries_mask == 0, "Both or none."); | |
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278 size_t max_entries_log = (size_t)log2_long((jlong)G1RSetRegionEntries); |
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279 _max_fine_entries = (size_t)1 << max_entries_log; |
342 | 280 _mod_max_fine_entries_mask = _max_fine_entries - 1; |
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281 |
342 | 282 assert(_fine_eviction_sample_size == 0 |
283 && _fine_eviction_stride == 0, "All init at same time."); | |
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284 _fine_eviction_sample_size = MAX2((size_t)4, max_entries_log); |
342 | 285 _fine_eviction_stride = _max_fine_entries / _fine_eviction_sample_size; |
286 } | |
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287 |
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288 _fine_grain_regions = NEW_C_HEAP_ARRAY3(PerRegionTablePtr, _max_fine_entries, |
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289 mtGC, 0, AllocFailStrategy::RETURN_NULL); |
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290 |
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291 if (_fine_grain_regions == NULL) { |
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292 vm_exit_out_of_memory(sizeof(void*)*_max_fine_entries, OOM_MALLOC_ERROR, |
342 | 293 "Failed to allocate _fine_grain_entries."); |
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294 } |
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295 |
342 | 296 for (size_t i = 0; i < _max_fine_entries; i++) { |
297 _fine_grain_regions[i] = NULL; | |
298 } | |
299 } | |
300 | |
6253 | 301 void OtherRegionsTable::link_to_all(PerRegionTable* prt) { |
302 // We always append to the beginning of the list for convenience; | |
303 // the order of entries in this list does not matter. | |
304 if (_first_all_fine_prts != NULL) { | |
305 assert(_first_all_fine_prts->prev() == NULL, "invariant"); | |
306 _first_all_fine_prts->set_prev(prt); | |
307 prt->set_next(_first_all_fine_prts); | |
308 } else { | |
309 // this is the first element we insert. Adjust the "last" pointer | |
310 _last_all_fine_prts = prt; | |
311 assert(prt->next() == NULL, "just checking"); | |
312 } | |
313 // the new element is always the first element without a predecessor | |
314 prt->set_prev(NULL); | |
315 _first_all_fine_prts = prt; | |
316 | |
317 assert(prt->prev() == NULL, "just checking"); | |
318 assert(_first_all_fine_prts == prt, "just checking"); | |
319 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || | |
320 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), | |
321 "just checking"); | |
322 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, | |
323 "just checking"); | |
324 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, | |
325 "just checking"); | |
326 } | |
327 | |
328 void OtherRegionsTable::unlink_from_all(PerRegionTable* prt) { | |
329 if (prt->prev() != NULL) { | |
330 assert(_first_all_fine_prts != prt, "just checking"); | |
331 prt->prev()->set_next(prt->next()); | |
332 // removing the last element in the list? | |
333 if (_last_all_fine_prts == prt) { | |
334 _last_all_fine_prts = prt->prev(); | |
335 } | |
336 } else { | |
337 assert(_first_all_fine_prts == prt, "just checking"); | |
338 _first_all_fine_prts = prt->next(); | |
339 // list is empty now? | |
340 if (_first_all_fine_prts == NULL) { | |
341 _last_all_fine_prts = NULL; | |
342 } | |
343 } | |
344 | |
345 if (prt->next() != NULL) { | |
346 prt->next()->set_prev(prt->prev()); | |
347 } | |
348 | |
349 prt->set_next(NULL); | |
350 prt->set_prev(NULL); | |
351 | |
352 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || | |
353 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), | |
354 "just checking"); | |
355 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, | |
356 "just checking"); | |
357 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, | |
358 "just checking"); | |
359 } | |
360 | |
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361 int** OtherRegionsTable::_from_card_cache = NULL; |
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362 uint OtherRegionsTable::_from_card_cache_max_regions = 0; |
342 | 363 size_t OtherRegionsTable::_from_card_cache_mem_size = 0; |
364 | |
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365 void OtherRegionsTable::init_from_card_cache(uint max_regions) { |
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366 guarantee(_from_card_cache == NULL, "Should not call this multiple times"); |
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367 uint n_par_rs = HeapRegionRemSet::num_par_rem_sets(); |
342 | 368 |
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369 _from_card_cache_max_regions = max_regions; |
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370 _from_card_cache = Padded2DArray<int, mtGC>::create_unfreeable(n_par_rs, |
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371 _from_card_cache_max_regions, |
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372 &_from_card_cache_mem_size); |
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373 |
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374 for (uint i = 0; i < n_par_rs; i++) { |
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375 for (uint j = 0; j < _from_card_cache_max_regions; j++) { |
342 | 376 _from_card_cache[i][j] = -1; // An invalid value. |
377 } | |
378 } | |
379 } | |
380 | |
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381 void OtherRegionsTable::shrink_from_card_cache(uint new_n_regs) { |
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382 for (uint i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { |
342 | 383 assert(new_n_regs <= _from_card_cache_max_regions, "Must be within max."); |
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384 for (uint j = new_n_regs; j < _from_card_cache_max_regions; j++) { |
342 | 385 _from_card_cache[i][j] = -1; // An invalid value. |
386 } | |
387 } | |
388 } | |
389 | |
390 #ifndef PRODUCT | |
391 void OtherRegionsTable::print_from_card_cache() { | |
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392 for (uint i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { |
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393 for (uint j = 0; j < _from_card_cache_max_regions; j++) { |
342 | 394 gclog_or_tty->print_cr("_from_card_cache[%d][%d] = %d.", |
395 i, j, _from_card_cache[i][j]); | |
396 } | |
397 } | |
398 } | |
399 #endif | |
400 | |
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401 void OtherRegionsTable::add_reference(OopOrNarrowOopStar from, int tid) { |
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402 size_t cur_hrs_ind = (size_t) hr()->hrs_index(); |
342 | 403 |
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404 if (G1TraceHeapRegionRememberedSet) { |
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405 gclog_or_tty->print_cr("ORT::add_reference_work(" PTR_FORMAT "->" PTR_FORMAT ").", |
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406 from, |
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407 UseCompressedOops |
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408 ? (void *)oopDesc::load_decode_heap_oop((narrowOop*)from) |
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409 : (void *)oopDesc::load_decode_heap_oop((oop*)from)); |
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410 } |
342 | 411 |
412 int from_card = (int)(uintptr_t(from) >> CardTableModRefBS::card_shift); | |
413 | |
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414 if (G1TraceHeapRegionRememberedSet) { |
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415 gclog_or_tty->print_cr("Table for [" PTR_FORMAT "...): card %d (cache = %d)", |
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416 hr()->bottom(), from_card, |
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417 _from_card_cache[tid][cur_hrs_ind]); |
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418 } |
342 | 419 |
420 if (from_card == _from_card_cache[tid][cur_hrs_ind]) { | |
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421 if (G1TraceHeapRegionRememberedSet) { |
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422 gclog_or_tty->print_cr(" from-card cache hit."); |
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423 } |
342 | 424 assert(contains_reference(from), "We just added it!"); |
425 return; | |
426 } else { | |
427 _from_card_cache[tid][cur_hrs_ind] = from_card; | |
428 } | |
429 | |
430 // Note that this may be a continued H region. | |
431 HeapRegion* from_hr = _g1h->heap_region_containing_raw(from); | |
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432 RegionIdx_t from_hrs_ind = (RegionIdx_t) from_hr->hrs_index(); |
342 | 433 |
434 // If the region is already coarsened, return. | |
435 if (_coarse_map.at(from_hrs_ind)) { | |
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436 if (G1TraceHeapRegionRememberedSet) { |
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437 gclog_or_tty->print_cr(" coarse map hit."); |
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438 } |
342 | 439 assert(contains_reference(from), "We just added it!"); |
440 return; | |
441 } | |
442 | |
443 // Otherwise find a per-region table to add it to. | |
444 size_t ind = from_hrs_ind & _mod_max_fine_entries_mask; | |
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445 PerRegionTable* prt = find_region_table(ind, from_hr); |
342 | 446 if (prt == NULL) { |
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447 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); |
342 | 448 // Confirm that it's really not there... |
449 prt = find_region_table(ind, from_hr); | |
450 if (prt == NULL) { | |
451 | |
452 uintptr_t from_hr_bot_card_index = | |
453 uintptr_t(from_hr->bottom()) | |
454 >> CardTableModRefBS::card_shift; | |
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455 CardIdx_t card_index = from_card - from_hr_bot_card_index; |
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456 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
342 | 457 "Must be in range."); |
458 if (G1HRRSUseSparseTable && | |
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459 _sparse_table.add_card(from_hrs_ind, card_index)) { |
342 | 460 if (G1RecordHRRSOops) { |
461 HeapRegionRemSet::record(hr(), from); | |
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462 if (G1TraceHeapRegionRememberedSet) { |
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463 gclog_or_tty->print(" Added card " PTR_FORMAT " to region " |
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464 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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465 align_size_down(uintptr_t(from), |
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466 CardTableModRefBS::card_size), |
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467 hr()->bottom(), from); |
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468 } |
342 | 469 } |
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470 if (G1TraceHeapRegionRememberedSet) { |
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471 gclog_or_tty->print_cr(" added card to sparse table."); |
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472 } |
342 | 473 assert(contains_reference_locked(from), "We just added it!"); |
474 return; | |
475 } else { | |
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476 if (G1TraceHeapRegionRememberedSet) { |
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477 gclog_or_tty->print_cr(" [tid %d] sparse table entry " |
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478 "overflow(f: %d, t: %d)", |
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479 tid, from_hrs_ind, cur_hrs_ind); |
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480 } |
342 | 481 } |
482 | |
483 if (_n_fine_entries == _max_fine_entries) { | |
484 prt = delete_region_table(); | |
6253 | 485 // There is no need to clear the links to the 'all' list here: |
486 // prt will be reused immediately, i.e. remain in the 'all' list. | |
487 prt->init(from_hr, false /* clear_links_to_all_list */); | |
342 | 488 } else { |
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489 prt = PerRegionTable::alloc(from_hr); |
6253 | 490 link_to_all(prt); |
342 | 491 } |
492 | |
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493 PerRegionTable* first_prt = _fine_grain_regions[ind]; |
6253 | 494 prt->set_collision_list_next(first_prt); |
342 | 495 _fine_grain_regions[ind] = prt; |
496 _n_fine_entries++; | |
497 | |
498 if (G1HRRSUseSparseTable) { | |
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499 // Transfer from sparse to fine-grain. |
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500 SparsePRTEntry *sprt_entry = _sparse_table.get_entry(from_hrs_ind); |
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501 assert(sprt_entry != NULL, "There should have been an entry"); |
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502 for (int i = 0; i < SparsePRTEntry::cards_num(); i++) { |
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503 CardIdx_t c = sprt_entry->card(i); |
342 | 504 if (c != SparsePRTEntry::NullEntry) { |
505 prt->add_card(c); | |
506 } | |
507 } | |
508 // Now we can delete the sparse entry. | |
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509 bool res = _sparse_table.delete_entry(from_hrs_ind); |
342 | 510 assert(res, "It should have been there."); |
511 } | |
512 } | |
513 assert(prt != NULL && prt->hr() == from_hr, "consequence"); | |
514 } | |
515 // Note that we can't assert "prt->hr() == from_hr", because of the | |
516 // possibility of concurrent reuse. But see head comment of | |
517 // OtherRegionsTable for why this is OK. | |
518 assert(prt != NULL, "Inv"); | |
519 | |
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520 prt->add_reference(from); |
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521 |
342 | 522 if (G1RecordHRRSOops) { |
523 HeapRegionRemSet::record(hr(), from); | |
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524 if (G1TraceHeapRegionRememberedSet) { |
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525 gclog_or_tty->print("Added card " PTR_FORMAT " to region " |
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526 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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527 align_size_down(uintptr_t(from), |
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528 CardTableModRefBS::card_size), |
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529 hr()->bottom(), from); |
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530 } |
342 | 531 } |
532 assert(contains_reference(from), "We just added it!"); | |
533 } | |
534 | |
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535 PerRegionTable* |
342 | 536 OtherRegionsTable::find_region_table(size_t ind, HeapRegion* hr) const { |
537 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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538 PerRegionTable* prt = _fine_grain_regions[ind]; |
342 | 539 while (prt != NULL && prt->hr() != hr) { |
6253 | 540 prt = prt->collision_list_next(); |
342 | 541 } |
542 // Loop postcondition is the method postcondition. | |
543 return prt; | |
544 } | |
545 | |
546 jint OtherRegionsTable::_n_coarsenings = 0; | |
547 | |
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548 PerRegionTable* OtherRegionsTable::delete_region_table() { |
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549 assert(_m->owned_by_self(), "Precondition"); |
342 | 550 assert(_n_fine_entries == _max_fine_entries, "Precondition"); |
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551 PerRegionTable* max = NULL; |
342 | 552 jint max_occ = 0; |
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553 PerRegionTable** max_prev; |
342 | 554 size_t max_ind; |
555 | |
556 size_t i = _fine_eviction_start; | |
557 for (size_t k = 0; k < _fine_eviction_sample_size; k++) { | |
558 size_t ii = i; | |
559 // Make sure we get a non-NULL sample. | |
560 while (_fine_grain_regions[ii] == NULL) { | |
561 ii++; | |
562 if (ii == _max_fine_entries) ii = 0; | |
563 guarantee(ii != i, "We must find one."); | |
564 } | |
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565 PerRegionTable** prev = &_fine_grain_regions[ii]; |
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566 PerRegionTable* cur = *prev; |
342 | 567 while (cur != NULL) { |
568 jint cur_occ = cur->occupied(); | |
569 if (max == NULL || cur_occ > max_occ) { | |
570 max = cur; | |
571 max_prev = prev; | |
572 max_ind = i; | |
573 max_occ = cur_occ; | |
574 } | |
6253 | 575 prev = cur->collision_list_next_addr(); |
576 cur = cur->collision_list_next(); | |
342 | 577 } |
578 i = i + _fine_eviction_stride; | |
579 if (i >= _n_fine_entries) i = i - _n_fine_entries; | |
580 } | |
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581 |
342 | 582 _fine_eviction_start++; |
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583 |
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584 if (_fine_eviction_start >= _n_fine_entries) { |
342 | 585 _fine_eviction_start -= _n_fine_entries; |
586 } | |
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587 |
342 | 588 guarantee(max != NULL, "Since _n_fine_entries > 0"); |
589 | |
590 // Set the corresponding coarse bit. | |
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591 size_t max_hrs_index = (size_t) max->hr()->hrs_index(); |
342 | 592 if (!_coarse_map.at(max_hrs_index)) { |
593 _coarse_map.at_put(max_hrs_index, true); | |
594 _n_coarse_entries++; | |
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595 if (G1TraceHeapRegionRememberedSet) { |
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596 gclog_or_tty->print("Coarsened entry in region [" PTR_FORMAT "...] " |
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597 "for region [" PTR_FORMAT "...] (%d coarse entries).\n", |
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598 hr()->bottom(), |
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599 max->hr()->bottom(), |
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600 _n_coarse_entries); |
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601 } |
342 | 602 } |
603 | |
604 // Unsplice. | |
6253 | 605 *max_prev = max->collision_list_next(); |
342 | 606 Atomic::inc(&_n_coarsenings); |
607 _n_fine_entries--; | |
608 return max; | |
609 } | |
610 | |
611 | |
612 // At present, this must be called stop-world single-threaded. | |
613 void OtherRegionsTable::scrub(CardTableModRefBS* ctbs, | |
614 BitMap* region_bm, BitMap* card_bm) { | |
615 // First eliminated garbage regions from the coarse map. | |
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616 if (G1RSScrubVerbose) { |
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617 gclog_or_tty->print_cr("Scrubbing region %u:", hr()->hrs_index()); |
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618 } |
342 | 619 |
620 assert(_coarse_map.size() == region_bm->size(), "Precondition"); | |
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621 if (G1RSScrubVerbose) { |
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622 gclog_or_tty->print(" Coarse map: before = "SIZE_FORMAT"...", |
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623 _n_coarse_entries); |
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624 } |
342 | 625 _coarse_map.set_intersection(*region_bm); |
626 _n_coarse_entries = _coarse_map.count_one_bits(); | |
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627 if (G1RSScrubVerbose) { |
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628 gclog_or_tty->print_cr(" after = "SIZE_FORMAT".", _n_coarse_entries); |
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629 } |
342 | 630 |
631 // Now do the fine-grained maps. | |
632 for (size_t i = 0; i < _max_fine_entries; i++) { | |
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633 PerRegionTable* cur = _fine_grain_regions[i]; |
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634 PerRegionTable** prev = &_fine_grain_regions[i]; |
342 | 635 while (cur != NULL) { |
6253 | 636 PerRegionTable* nxt = cur->collision_list_next(); |
342 | 637 // If the entire region is dead, eliminate. |
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638 if (G1RSScrubVerbose) { |
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639 gclog_or_tty->print_cr(" For other region %u:", |
3766 | 640 cur->hr()->hrs_index()); |
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641 } |
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642 if (!region_bm->at((size_t) cur->hr()->hrs_index())) { |
342 | 643 *prev = nxt; |
6253 | 644 cur->set_collision_list_next(NULL); |
342 | 645 _n_fine_entries--; |
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646 if (G1RSScrubVerbose) { |
342 | 647 gclog_or_tty->print_cr(" deleted via region map."); |
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648 } |
6253 | 649 unlink_from_all(cur); |
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650 PerRegionTable::free(cur); |
342 | 651 } else { |
652 // Do fine-grain elimination. | |
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653 if (G1RSScrubVerbose) { |
342 | 654 gclog_or_tty->print(" occ: before = %4d.", cur->occupied()); |
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655 } |
342 | 656 cur->scrub(ctbs, card_bm); |
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657 if (G1RSScrubVerbose) { |
342 | 658 gclog_or_tty->print_cr(" after = %4d.", cur->occupied()); |
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659 } |
342 | 660 // Did that empty the table completely? |
661 if (cur->occupied() == 0) { | |
662 *prev = nxt; | |
6253 | 663 cur->set_collision_list_next(NULL); |
342 | 664 _n_fine_entries--; |
6253 | 665 unlink_from_all(cur); |
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666 PerRegionTable::free(cur); |
342 | 667 } else { |
6253 | 668 prev = cur->collision_list_next_addr(); |
342 | 669 } |
670 } | |
671 cur = nxt; | |
672 } | |
673 } | |
674 // Since we may have deleted a from_card_cache entry from the RS, clear | |
675 // the FCC. | |
676 clear_fcc(); | |
677 } | |
678 | |
679 | |
680 size_t OtherRegionsTable::occupied() const { | |
681 size_t sum = occ_fine(); | |
682 sum += occ_sparse(); | |
683 sum += occ_coarse(); | |
684 return sum; | |
685 } | |
686 | |
687 size_t OtherRegionsTable::occ_fine() const { | |
688 size_t sum = 0; | |
6253 | 689 |
690 size_t num = 0; | |
691 PerRegionTable * cur = _first_all_fine_prts; | |
692 while (cur != NULL) { | |
693 sum += cur->occupied(); | |
694 cur = cur->next(); | |
695 num++; | |
342 | 696 } |
6253 | 697 guarantee(num == _n_fine_entries, "just checking"); |
342 | 698 return sum; |
699 } | |
700 | |
701 size_t OtherRegionsTable::occ_coarse() const { | |
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702 return (_n_coarse_entries * HeapRegion::CardsPerRegion); |
342 | 703 } |
704 | |
705 size_t OtherRegionsTable::occ_sparse() const { | |
706 return _sparse_table.occupied(); | |
707 } | |
708 | |
709 size_t OtherRegionsTable::mem_size() const { | |
710 size_t sum = 0; | |
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711 // all PRTs are of the same size so it is sufficient to query only one of them. |
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712 if (_first_all_fine_prts != NULL) { |
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713 assert(_last_all_fine_prts != NULL && |
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714 _first_all_fine_prts->mem_size() == _last_all_fine_prts->mem_size(), "check that mem_size() is constant"); |
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715 sum += _first_all_fine_prts->mem_size() * _n_fine_entries; |
342 | 716 } |
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717 sum += (sizeof(PerRegionTable*) * _max_fine_entries); |
342 | 718 sum += (_coarse_map.size_in_words() * HeapWordSize); |
719 sum += (_sparse_table.mem_size()); | |
720 sum += sizeof(*this) - sizeof(_sparse_table); // Avoid double counting above. | |
721 return sum; | |
722 } | |
723 | |
724 size_t OtherRegionsTable::static_mem_size() { | |
725 return _from_card_cache_mem_size; | |
726 } | |
727 | |
728 size_t OtherRegionsTable::fl_mem_size() { | |
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729 return PerRegionTable::fl_mem_size(); |
342 | 730 } |
731 | |
732 void OtherRegionsTable::clear_fcc() { | |
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733 uint hrs_idx = hr()->hrs_index(); |
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734 uint num_par_remsets = HeapRegionRemSet::num_par_rem_sets(); |
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735 for (uint i = 0; i < num_par_remsets; i++) { |
6253 | 736 _from_card_cache[i][hrs_idx] = -1; |
342 | 737 } |
738 } | |
739 | |
740 void OtherRegionsTable::clear() { | |
6253 | 741 // if there are no entries, skip this step |
742 if (_first_all_fine_prts != NULL) { | |
743 guarantee(_first_all_fine_prts != NULL && _last_all_fine_prts != NULL, "just checking"); | |
744 PerRegionTable::bulk_free(_first_all_fine_prts, _last_all_fine_prts); | |
745 memset(_fine_grain_regions, 0, _max_fine_entries * sizeof(_fine_grain_regions[0])); | |
746 } else { | |
747 guarantee(_first_all_fine_prts == NULL && _last_all_fine_prts == NULL, "just checking"); | |
342 | 748 } |
6253 | 749 |
750 _first_all_fine_prts = _last_all_fine_prts = NULL; | |
342 | 751 _sparse_table.clear(); |
752 _coarse_map.clear(); | |
753 _n_fine_entries = 0; | |
754 _n_coarse_entries = 0; | |
755 | |
756 clear_fcc(); | |
757 } | |
758 | |
759 void OtherRegionsTable::clear_incoming_entry(HeapRegion* from_hr) { | |
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760 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); |
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761 size_t hrs_ind = (size_t) from_hr->hrs_index(); |
342 | 762 size_t ind = hrs_ind & _mod_max_fine_entries_mask; |
763 if (del_single_region_table(ind, from_hr)) { | |
764 assert(!_coarse_map.at(hrs_ind), "Inv"); | |
765 } else { | |
766 _coarse_map.par_at_put(hrs_ind, 0); | |
767 } | |
768 // Check to see if any of the fcc entries come from here. | |
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769 uint hr_ind = hr()->hrs_index(); |
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770 for (uint tid = 0; tid < HeapRegionRemSet::num_par_rem_sets(); tid++) { |
342 | 771 int fcc_ent = _from_card_cache[tid][hr_ind]; |
772 if (fcc_ent != -1) { | |
773 HeapWord* card_addr = (HeapWord*) | |
774 (uintptr_t(fcc_ent) << CardTableModRefBS::card_shift); | |
775 if (hr()->is_in_reserved(card_addr)) { | |
776 // Clear the from card cache. | |
777 _from_card_cache[tid][hr_ind] = -1; | |
778 } | |
779 } | |
780 } | |
781 } | |
782 | |
783 bool OtherRegionsTable::del_single_region_table(size_t ind, | |
784 HeapRegion* hr) { | |
785 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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786 PerRegionTable** prev_addr = &_fine_grain_regions[ind]; |
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787 PerRegionTable* prt = *prev_addr; |
342 | 788 while (prt != NULL && prt->hr() != hr) { |
6253 | 789 prev_addr = prt->collision_list_next_addr(); |
790 prt = prt->collision_list_next(); | |
342 | 791 } |
792 if (prt != NULL) { | |
793 assert(prt->hr() == hr, "Loop postcondition."); | |
6253 | 794 *prev_addr = prt->collision_list_next(); |
795 unlink_from_all(prt); | |
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796 PerRegionTable::free(prt); |
342 | 797 _n_fine_entries--; |
798 return true; | |
799 } else { | |
800 return false; | |
801 } | |
802 } | |
803 | |
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804 bool OtherRegionsTable::contains_reference(OopOrNarrowOopStar from) const { |
342 | 805 // Cast away const in this case. |
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806 MutexLockerEx x((Mutex*)_m, Mutex::_no_safepoint_check_flag); |
342 | 807 return contains_reference_locked(from); |
808 } | |
809 | |
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810 bool OtherRegionsTable::contains_reference_locked(OopOrNarrowOopStar from) const { |
342 | 811 HeapRegion* hr = _g1h->heap_region_containing_raw(from); |
812 if (hr == NULL) return false; | |
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813 RegionIdx_t hr_ind = (RegionIdx_t) hr->hrs_index(); |
342 | 814 // Is this region in the coarse map? |
815 if (_coarse_map.at(hr_ind)) return true; | |
816 | |
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817 PerRegionTable* prt = find_region_table(hr_ind & _mod_max_fine_entries_mask, |
342 | 818 hr); |
819 if (prt != NULL) { | |
820 return prt->contains_reference(from); | |
821 | |
822 } else { | |
823 uintptr_t from_card = | |
824 (uintptr_t(from) >> CardTableModRefBS::card_shift); | |
825 uintptr_t hr_bot_card_index = | |
826 uintptr_t(hr->bottom()) >> CardTableModRefBS::card_shift; | |
827 assert(from_card >= hr_bot_card_index, "Inv"); | |
807
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828 CardIdx_t card_index = from_card - hr_bot_card_index; |
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829 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
942
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830 "Must be in range."); |
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831 return _sparse_table.contains_card(hr_ind, card_index); |
342 | 832 } |
833 | |
834 | |
835 } | |
836 | |
2173 | 837 void |
838 OtherRegionsTable::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
839 _sparse_table.do_cleanup_work(hrrs_cleanup_task); | |
840 } | |
841 | |
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842 // Determines how many threads can add records to an rset in parallel. |
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843 // This can be done by either mutator threads together with the |
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844 // concurrent refinement threads or GC threads. |
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845 uint HeapRegionRemSet::num_par_rem_sets() { |
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846 return (uint)MAX2(DirtyCardQueueSet::num_par_ids() + ConcurrentG1Refine::thread_num(), ParallelGCThreads); |
342 | 847 } |
848 | |
849 HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, | |
850 HeapRegion* hr) | |
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851 : _bosa(bosa), |
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852 _m(Mutex::leaf, FormatBuffer<128>("HeapRegionRemSet lock #"UINT32_FORMAT, hr->hrs_index()), true), |
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853 _code_roots(), _other_regions(hr, &_m) { |
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854 reset_for_par_iteration(); |
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855 } |
342 | 856 |
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857 void HeapRegionRemSet::setup_remset_size() { |
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858 // Setup sparse and fine-grain tables sizes. |
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859 // table_size = base * (log(region_size / 1M) + 1) |
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860 const int LOG_M = 20; |
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861 int region_size_log_mb = MAX2(HeapRegion::LogOfHRGrainBytes - LOG_M, 0); |
1261
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862 if (FLAG_IS_DEFAULT(G1RSetSparseRegionEntries)) { |
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863 G1RSetSparseRegionEntries = G1RSetSparseRegionEntriesBase * (region_size_log_mb + 1); |
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864 } |
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865 if (FLAG_IS_DEFAULT(G1RSetRegionEntries)) { |
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866 G1RSetRegionEntries = G1RSetRegionEntriesBase * (region_size_log_mb + 1); |
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867 } |
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868 guarantee(G1RSetSparseRegionEntries > 0 && G1RSetRegionEntries > 0 , "Sanity"); |
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869 } |
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870 |
342 | 871 bool HeapRegionRemSet::claim_iter() { |
872 if (_iter_state != Unclaimed) return false; | |
873 jint res = Atomic::cmpxchg(Claimed, (jint*)(&_iter_state), Unclaimed); | |
874 return (res == Unclaimed); | |
875 } | |
876 | |
877 void HeapRegionRemSet::set_iter_complete() { | |
878 _iter_state = Complete; | |
879 } | |
880 | |
881 bool HeapRegionRemSet::iter_is_complete() { | |
882 return _iter_state == Complete; | |
883 } | |
884 | |
885 #ifndef PRODUCT | |
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886 void HeapRegionRemSet::print() { |
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887 HeapRegionRemSetIterator iter(this); |
342 | 888 size_t card_index; |
889 while (iter.has_next(card_index)) { | |
890 HeapWord* card_start = | |
891 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
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892 gclog_or_tty->print_cr(" Card " PTR_FORMAT, card_start); |
342 | 893 } |
894 if (iter.n_yielded() != occupied()) { | |
895 gclog_or_tty->print_cr("Yielded disagrees with occupied:"); | |
896 gclog_or_tty->print_cr(" %6d yielded (%6d coarse, %6d fine).", | |
897 iter.n_yielded(), | |
898 iter.n_yielded_coarse(), iter.n_yielded_fine()); | |
899 gclog_or_tty->print_cr(" %6d occ (%6d coarse, %6d fine).", | |
900 occupied(), occ_coarse(), occ_fine()); | |
901 } | |
902 guarantee(iter.n_yielded() == occupied(), | |
903 "We should have yielded all the represented cards."); | |
904 } | |
905 #endif | |
906 | |
907 void HeapRegionRemSet::cleanup() { | |
908 SparsePRT::cleanup_all(); | |
909 } | |
910 | |
911 void HeapRegionRemSet::clear() { | |
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912 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); |
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913 clear_locked(); |
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914 } |
12080 | 915 |
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916 void HeapRegionRemSet::clear_locked() { |
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917 _code_roots.clear(); |
342 | 918 _other_regions.clear(); |
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919 assert(occupied_locked() == 0, "Should be clear."); |
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920 reset_for_par_iteration(); |
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921 } |
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922 |
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923 void HeapRegionRemSet::reset_for_par_iteration() { |
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924 _iter_state = Unclaimed; |
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925 _iter_claimed = 0; |
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926 // It's good to check this to make sure that the two methods are in sync. |
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927 assert(verify_ready_for_par_iteration(), "post-condition"); |
342 | 928 } |
929 | |
930 void HeapRegionRemSet::scrub(CardTableModRefBS* ctbs, | |
931 BitMap* region_bm, BitMap* card_bm) { | |
932 _other_regions.scrub(ctbs, region_bm, card_bm); | |
933 } | |
934 | |
12080 | 935 |
936 // Code roots support | |
937 | |
938 void HeapRegionRemSet::add_strong_code_root(nmethod* nm) { | |
939 assert(nm != NULL, "sanity"); | |
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940 _code_roots.add(nm); |
12080 | 941 } |
942 | |
943 void HeapRegionRemSet::remove_strong_code_root(nmethod* nm) { | |
944 assert(nm != NULL, "sanity"); | |
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945 _code_roots.remove(nm); |
12080 | 946 // Check that there were no duplicates |
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947 guarantee(!_code_roots.contains(nm), "duplicate entry found"); |
12080 | 948 } |
949 | |
950 class NMethodMigrationOopClosure : public OopClosure { | |
951 G1CollectedHeap* _g1h; | |
952 HeapRegion* _from; | |
953 nmethod* _nm; | |
954 | |
955 uint _num_self_forwarded; | |
956 | |
957 template <class T> void do_oop_work(T* p) { | |
958 T heap_oop = oopDesc::load_heap_oop(p); | |
959 if (!oopDesc::is_null(heap_oop)) { | |
960 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
961 if (_from->is_in(obj)) { | |
962 // Reference still points into the source region. | |
963 // Since roots are immediately evacuated this means that | |
964 // we must have self forwarded the object | |
965 assert(obj->is_forwarded(), | |
966 err_msg("code roots should be immediately evacuated. " | |
967 "Ref: "PTR_FORMAT", " | |
968 "Obj: "PTR_FORMAT", " | |
969 "Region: "HR_FORMAT, | |
970 p, (void*) obj, HR_FORMAT_PARAMS(_from))); | |
971 assert(obj->forwardee() == obj, | |
972 err_msg("not self forwarded? obj = "PTR_FORMAT, (void*)obj)); | |
973 | |
974 // The object has been self forwarded. | |
975 // Note, if we're during an initial mark pause, there is | |
976 // no need to explicitly mark object. It will be marked | |
977 // during the regular evacuation failure handling code. | |
978 _num_self_forwarded++; | |
979 } else { | |
980 // The reference points into a promotion or to-space region | |
981 HeapRegion* to = _g1h->heap_region_containing(obj); | |
982 to->rem_set()->add_strong_code_root(_nm); | |
983 } | |
984 } | |
985 } | |
986 | |
987 public: | |
988 NMethodMigrationOopClosure(G1CollectedHeap* g1h, HeapRegion* from, nmethod* nm): | |
989 _g1h(g1h), _from(from), _nm(nm), _num_self_forwarded(0) {} | |
990 | |
991 void do_oop(narrowOop* p) { do_oop_work(p); } | |
992 void do_oop(oop* p) { do_oop_work(p); } | |
993 | |
994 uint retain() { return _num_self_forwarded > 0; } | |
995 }; | |
996 | |
997 void HeapRegionRemSet::migrate_strong_code_roots() { | |
998 assert(hr()->in_collection_set(), "only collection set regions"); | |
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999 assert(!hr()->isHumongous(), |
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1000 err_msg("humongous region "HR_FORMAT" should not have been added to the collection set", |
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1001 HR_FORMAT_PARAMS(hr()))); |
12080 | 1002 |
1003 ResourceMark rm; | |
1004 | |
1005 // List of code blobs to retain for this region | |
1006 GrowableArray<nmethod*> to_be_retained(10); | |
1007 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1008 | |
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1009 while (!_code_roots.is_empty()) { |
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1010 nmethod *nm = _code_roots.pop(); |
12080 | 1011 if (nm != NULL) { |
1012 NMethodMigrationOopClosure oop_cl(g1h, hr(), nm); | |
1013 nm->oops_do(&oop_cl); | |
1014 if (oop_cl.retain()) { | |
1015 to_be_retained.push(nm); | |
1016 } | |
1017 } | |
1018 } | |
1019 | |
1020 // Now push any code roots we need to retain | |
1021 assert(to_be_retained.is_empty() || hr()->evacuation_failed(), | |
1022 "Retained nmethod list must be empty or " | |
1023 "evacuation of this region failed"); | |
1024 | |
1025 while (to_be_retained.is_nonempty()) { | |
1026 nmethod* nm = to_be_retained.pop(); | |
1027 assert(nm != NULL, "sanity"); | |
1028 add_strong_code_root(nm); | |
1029 } | |
1030 } | |
1031 | |
1032 void HeapRegionRemSet::strong_code_roots_do(CodeBlobClosure* blk) const { | |
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1033 _code_roots.nmethods_do(blk); |
12080 | 1034 } |
1035 | |
1036 size_t HeapRegionRemSet::strong_code_roots_mem_size() { | |
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1037 return _code_roots.mem_size(); |
12080 | 1038 } |
1039 | |
342 | 1040 //-------------------- Iteration -------------------- |
1041 | |
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1042 HeapRegionRemSetIterator:: HeapRegionRemSetIterator(HeapRegionRemSet* hrrs) : |
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1043 _hrrs(hrrs), |
342 | 1044 _g1h(G1CollectedHeap::heap()), |
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1045 _coarse_map(&hrrs->_other_regions._coarse_map), |
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1046 _fine_grain_regions(hrrs->_other_regions._fine_grain_regions), |
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1047 _bosa(hrrs->bosa()), |
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1048 _is(Sparse), |
342 | 1049 // Set these values so that we increment to the first region. |
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1050 _coarse_cur_region_index(-1), |
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1051 _coarse_cur_region_cur_card(HeapRegion::CardsPerRegion-1), |
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1052 _cur_region_cur_card(0), |
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1053 _fine_array_index(-1), |
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1054 _fine_cur_prt(NULL), |
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1055 _n_yielded_coarse(0), |
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1056 _n_yielded_fine(0), |
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1057 _n_yielded_sparse(0), |
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1058 _sparse_iter(&hrrs->_other_regions._sparse_table) {} |
342 | 1059 |
1060 bool HeapRegionRemSetIterator::coarse_has_next(size_t& card_index) { | |
1061 if (_hrrs->_other_regions._n_coarse_entries == 0) return false; | |
1062 // Go to the next card. | |
1063 _coarse_cur_region_cur_card++; | |
1064 // Was the last the last card in the current region? | |
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1065 if (_coarse_cur_region_cur_card == HeapRegion::CardsPerRegion) { |
342 | 1066 // Yes: find the next region. This may leave _coarse_cur_region_index |
1067 // Set to the last index, in which case there are no more coarse | |
1068 // regions. | |
1069 _coarse_cur_region_index = | |
1070 (int) _coarse_map->get_next_one_offset(_coarse_cur_region_index + 1); | |
1071 if ((size_t)_coarse_cur_region_index < _coarse_map->size()) { | |
1072 _coarse_cur_region_cur_card = 0; | |
1073 HeapWord* r_bot = | |
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1074 _g1h->region_at((uint) _coarse_cur_region_index)->bottom(); |
342 | 1075 _cur_region_card_offset = _bosa->index_for(r_bot); |
1076 } else { | |
1077 return false; | |
1078 } | |
1079 } | |
1080 // If we didn't return false above, then we can yield a card. | |
1081 card_index = _cur_region_card_offset + _coarse_cur_region_cur_card; | |
1082 return true; | |
1083 } | |
1084 | |
1085 void HeapRegionRemSetIterator::fine_find_next_non_null_prt() { | |
1086 // Otherwise, find the next bucket list in the array. | |
1087 _fine_array_index++; | |
1088 while (_fine_array_index < (int) OtherRegionsTable::_max_fine_entries) { | |
1089 _fine_cur_prt = _fine_grain_regions[_fine_array_index]; | |
1090 if (_fine_cur_prt != NULL) return; | |
1091 else _fine_array_index++; | |
1092 } | |
1093 assert(_fine_cur_prt == NULL, "Loop post"); | |
1094 } | |
1095 | |
1096 bool HeapRegionRemSetIterator::fine_has_next(size_t& card_index) { | |
1097 if (fine_has_next()) { | |
1098 _cur_region_cur_card = | |
1099 _fine_cur_prt->_bm.get_next_one_offset(_cur_region_cur_card + 1); | |
1100 } | |
1101 while (!fine_has_next()) { | |
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1102 if (_cur_region_cur_card == (size_t) HeapRegion::CardsPerRegion) { |
342 | 1103 _cur_region_cur_card = 0; |
6253 | 1104 _fine_cur_prt = _fine_cur_prt->collision_list_next(); |
342 | 1105 } |
1106 if (_fine_cur_prt == NULL) { | |
1107 fine_find_next_non_null_prt(); | |
1108 if (_fine_cur_prt == NULL) return false; | |
1109 } | |
1110 assert(_fine_cur_prt != NULL && _cur_region_cur_card == 0, | |
1111 "inv."); | |
1112 HeapWord* r_bot = | |
1113 _fine_cur_prt->hr()->bottom(); | |
1114 _cur_region_card_offset = _bosa->index_for(r_bot); | |
1115 _cur_region_cur_card = _fine_cur_prt->_bm.get_next_one_offset(0); | |
1116 } | |
1117 assert(fine_has_next(), "Or else we exited the loop via the return."); | |
1118 card_index = _cur_region_card_offset + _cur_region_cur_card; | |
1119 return true; | |
1120 } | |
1121 | |
1122 bool HeapRegionRemSetIterator::fine_has_next() { | |
1123 return | |
1124 _fine_cur_prt != NULL && | |
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1125 _cur_region_cur_card < HeapRegion::CardsPerRegion; |
342 | 1126 } |
1127 | |
1128 bool HeapRegionRemSetIterator::has_next(size_t& card_index) { | |
1129 switch (_is) { | |
1130 case Sparse: | |
1131 if (_sparse_iter.has_next(card_index)) { | |
1132 _n_yielded_sparse++; | |
1133 return true; | |
1134 } | |
1135 // Otherwise, deliberate fall-through | |
1136 _is = Fine; | |
1137 case Fine: | |
1138 if (fine_has_next(card_index)) { | |
1139 _n_yielded_fine++; | |
1140 return true; | |
1141 } | |
1142 // Otherwise, deliberate fall-through | |
1143 _is = Coarse; | |
1144 case Coarse: | |
1145 if (coarse_has_next(card_index)) { | |
1146 _n_yielded_coarse++; | |
1147 return true; | |
1148 } | |
1149 // Otherwise... | |
1150 break; | |
1151 } | |
1152 assert(ParallelGCThreads > 1 || | |
1153 n_yielded() == _hrrs->occupied(), | |
1154 "Should have yielded all the cards in the rem set " | |
1155 "(in the non-par case)."); | |
1156 return false; | |
1157 } | |
1158 | |
1159 | |
1160 | |
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1161 OopOrNarrowOopStar* HeapRegionRemSet::_recorded_oops = NULL; |
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1162 HeapWord** HeapRegionRemSet::_recorded_cards = NULL; |
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1163 HeapRegion** HeapRegionRemSet::_recorded_regions = NULL; |
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1164 int HeapRegionRemSet::_n_recorded = 0; |
342 | 1165 |
1166 HeapRegionRemSet::Event* HeapRegionRemSet::_recorded_events = NULL; | |
1167 int* HeapRegionRemSet::_recorded_event_index = NULL; | |
1168 int HeapRegionRemSet::_n_recorded_events = 0; | |
1169 | |
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1170 void HeapRegionRemSet::record(HeapRegion* hr, OopOrNarrowOopStar f) { |
342 | 1171 if (_recorded_oops == NULL) { |
1172 assert(_n_recorded == 0 | |
1173 && _recorded_cards == NULL | |
1174 && _recorded_regions == NULL, | |
1175 "Inv"); | |
6197 | 1176 _recorded_oops = NEW_C_HEAP_ARRAY(OopOrNarrowOopStar, MaxRecorded, mtGC); |
1177 _recorded_cards = NEW_C_HEAP_ARRAY(HeapWord*, MaxRecorded, mtGC); | |
1178 _recorded_regions = NEW_C_HEAP_ARRAY(HeapRegion*, MaxRecorded, mtGC); | |
342 | 1179 } |
1180 if (_n_recorded == MaxRecorded) { | |
1181 gclog_or_tty->print_cr("Filled up 'recorded' (%d).", MaxRecorded); | |
1182 } else { | |
1183 _recorded_cards[_n_recorded] = | |
1184 (HeapWord*)align_size_down(uintptr_t(f), | |
1185 CardTableModRefBS::card_size); | |
1186 _recorded_oops[_n_recorded] = f; | |
1187 _recorded_regions[_n_recorded] = hr; | |
1188 _n_recorded++; | |
1189 } | |
1190 } | |
1191 | |
1192 void HeapRegionRemSet::record_event(Event evnt) { | |
1193 if (!G1RecordHRRSEvents) return; | |
1194 | |
1195 if (_recorded_events == NULL) { | |
1196 assert(_n_recorded_events == 0 | |
1197 && _recorded_event_index == NULL, | |
1198 "Inv"); | |
6197 | 1199 _recorded_events = NEW_C_HEAP_ARRAY(Event, MaxRecordedEvents, mtGC); |
1200 _recorded_event_index = NEW_C_HEAP_ARRAY(int, MaxRecordedEvents, mtGC); | |
342 | 1201 } |
1202 if (_n_recorded_events == MaxRecordedEvents) { | |
1203 gclog_or_tty->print_cr("Filled up 'recorded_events' (%d).", MaxRecordedEvents); | |
1204 } else { | |
1205 _recorded_events[_n_recorded_events] = evnt; | |
1206 _recorded_event_index[_n_recorded_events] = _n_recorded; | |
1207 _n_recorded_events++; | |
1208 } | |
1209 } | |
1210 | |
1211 void HeapRegionRemSet::print_event(outputStream* str, Event evnt) { | |
1212 switch (evnt) { | |
1213 case Event_EvacStart: | |
1214 str->print("Evac Start"); | |
1215 break; | |
1216 case Event_EvacEnd: | |
1217 str->print("Evac End"); | |
1218 break; | |
1219 case Event_RSUpdateEnd: | |
1220 str->print("RS Update End"); | |
1221 break; | |
1222 } | |
1223 } | |
1224 | |
1225 void HeapRegionRemSet::print_recorded() { | |
1226 int cur_evnt = 0; | |
1227 Event cur_evnt_kind; | |
1228 int cur_evnt_ind = 0; | |
1229 if (_n_recorded_events > 0) { | |
1230 cur_evnt_kind = _recorded_events[cur_evnt]; | |
1231 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
1232 } | |
1233 | |
1234 for (int i = 0; i < _n_recorded; i++) { | |
1235 while (cur_evnt < _n_recorded_events && i == cur_evnt_ind) { | |
1236 gclog_or_tty->print("Event: "); | |
1237 print_event(gclog_or_tty, cur_evnt_kind); | |
1238 gclog_or_tty->print_cr(""); | |
1239 cur_evnt++; | |
1240 if (cur_evnt < MaxRecordedEvents) { | |
1241 cur_evnt_kind = _recorded_events[cur_evnt]; | |
1242 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
1243 } | |
1244 } | |
1245 gclog_or_tty->print("Added card " PTR_FORMAT " to region [" PTR_FORMAT "...]" | |
1246 " for ref " PTR_FORMAT ".\n", | |
1247 _recorded_cards[i], _recorded_regions[i]->bottom(), | |
1248 _recorded_oops[i]); | |
1249 } | |
1250 } | |
1251 | |
2173 | 1252 void HeapRegionRemSet::reset_for_cleanup_tasks() { |
1253 SparsePRT::reset_for_cleanup_tasks(); | |
1254 } | |
1255 | |
1256 void HeapRegionRemSet::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
1257 _other_regions.do_cleanup_work(hrrs_cleanup_task); | |
1258 } | |
1259 | |
1260 void | |
1261 HeapRegionRemSet::finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task) { | |
1262 SparsePRT::finish_cleanup_task(hrrs_cleanup_task); | |
1263 } | |
1264 | |
342 | 1265 #ifndef PRODUCT |
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1266 void PerRegionTable::test_fl_mem_size() { |
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1267 PerRegionTable* dummy = alloc(NULL); |
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1268 free(dummy); |
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1269 guarantee(dummy->mem_size() == fl_mem_size(), "fl_mem_size() does not return the correct element size"); |
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1270 // try to reset the state |
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1271 _free_list = NULL; |
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1272 delete dummy; |
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1273 } |
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1274 |
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1275 void HeapRegionRemSet::test_prt() { |
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1276 PerRegionTable::test_fl_mem_size(); |
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1277 } |
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1278 |
342 | 1279 void HeapRegionRemSet::test() { |
1280 os::sleep(Thread::current(), (jlong)5000, false); | |
1281 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1282 | |
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1283 // Run with "-XX:G1LogRSetRegionEntries=2", so that 1 and 5 end up in same |
342 | 1284 // hash bucket. |
1285 HeapRegion* hr0 = g1h->region_at(0); | |
1286 HeapRegion* hr1 = g1h->region_at(1); | |
1287 HeapRegion* hr2 = g1h->region_at(5); | |
1288 HeapRegion* hr3 = g1h->region_at(6); | |
1289 HeapRegion* hr4 = g1h->region_at(7); | |
1290 HeapRegion* hr5 = g1h->region_at(8); | |
1291 | |
1292 HeapWord* hr1_start = hr1->bottom(); | |
1293 HeapWord* hr1_mid = hr1_start + HeapRegion::GrainWords/2; | |
1294 HeapWord* hr1_last = hr1->end() - 1; | |
1295 | |
1296 HeapWord* hr2_start = hr2->bottom(); | |
1297 HeapWord* hr2_mid = hr2_start + HeapRegion::GrainWords/2; | |
1298 HeapWord* hr2_last = hr2->end() - 1; | |
1299 | |
1300 HeapWord* hr3_start = hr3->bottom(); | |
1301 HeapWord* hr3_mid = hr3_start + HeapRegion::GrainWords/2; | |
1302 HeapWord* hr3_last = hr3->end() - 1; | |
1303 | |
1304 HeapRegionRemSet* hrrs = hr0->rem_set(); | |
1305 | |
1306 // Make three references from region 0x101... | |
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1307 hrrs->add_reference((OopOrNarrowOopStar)hr1_start); |
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1308 hrrs->add_reference((OopOrNarrowOopStar)hr1_mid); |
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1309 hrrs->add_reference((OopOrNarrowOopStar)hr1_last); |
342 | 1310 |
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1311 hrrs->add_reference((OopOrNarrowOopStar)hr2_start); |
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1312 hrrs->add_reference((OopOrNarrowOopStar)hr2_mid); |
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1313 hrrs->add_reference((OopOrNarrowOopStar)hr2_last); |
342 | 1314 |
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1315 hrrs->add_reference((OopOrNarrowOopStar)hr3_start); |
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1316 hrrs->add_reference((OopOrNarrowOopStar)hr3_mid); |
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1317 hrrs->add_reference((OopOrNarrowOopStar)hr3_last); |
342 | 1318 |
1319 // Now cause a coarsening. | |
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1320 hrrs->add_reference((OopOrNarrowOopStar)hr4->bottom()); |
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1321 hrrs->add_reference((OopOrNarrowOopStar)hr5->bottom()); |
342 | 1322 |
1323 // Now, does iteration yield these three? | |
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1324 HeapRegionRemSetIterator iter(hrrs); |
342 | 1325 size_t sum = 0; |
1326 size_t card_index; | |
1327 while (iter.has_next(card_index)) { | |
1328 HeapWord* card_start = | |
1329 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
1330 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); | |
1331 sum++; | |
1332 } | |
1333 guarantee(sum == 11 - 3 + 2048, "Failure"); | |
1334 guarantee(sum == hrrs->occupied(), "Failure"); | |
1335 } | |
1336 #endif |