Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp @ 6188:7994a5a35fcf
6921087: G1: remove per-GC-thread expansion tables from the fine-grain remembered sets
Summary: Remove the per-thread expansion tables (PosParPRT) and associated expansion and compaction from the fine grain RSet entries. This code has been unused for a while.
Reviewed-by: johnc, brutisso
Contributed-by: Thomas Schatzl <thomas.schatzl@jku.at>
author | johnc |
---|---|
date | Mon, 25 Jun 2012 16:00:55 -0700 |
parents | 5c8bd7c16119 |
children | 24b9c7f4cae6 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
27 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" | |
28 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
29 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
30 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
31 #include "memory/allocation.hpp" | |
32 #include "memory/space.inline.hpp" | |
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33 #include "oops/oop.inline.hpp" |
1972 | 34 #include "utilities/bitMap.inline.hpp" |
35 #include "utilities/globalDefinitions.hpp" | |
342 | 36 |
37 // OtherRegionsTable | |
38 | |
39 class PerRegionTable: public CHeapObj { | |
40 friend class OtherRegionsTable; | |
41 friend class HeapRegionRemSetIterator; | |
42 | |
43 HeapRegion* _hr; | |
44 BitMap _bm; | |
45 jint _occupied; | |
46 | |
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47 // next pointer for free/allocated lis |
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48 PerRegionTable* _next; |
342 | 49 |
50 static PerRegionTable* _free_list; | |
51 | |
52 #ifdef _MSC_VER | |
53 // For some reason even though the classes are marked as friend they are unable | |
54 // to access CardsPerRegion when private/protected. Only the windows c++ compiler | |
55 // says this Sun CC and linux gcc don't have a problem with access when private | |
56 | |
57 public: | |
58 | |
59 #endif // _MSC_VER | |
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), | |
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72 _bm(HeapRegion::CardsPerRegion, false /* in-resource-area */) |
342 | 73 {} |
74 | |
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75 void add_card_work(CardIdx_t from_card, bool par) { |
342 | 76 if (!_bm.at(from_card)) { |
77 if (par) { | |
78 if (_bm.par_at_put(from_card, 1)) { | |
79 Atomic::inc(&_occupied); | |
80 } | |
81 } else { | |
82 _bm.at_put(from_card, 1); | |
83 _occupied++; | |
84 } | |
85 } | |
86 } | |
87 | |
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88 void add_reference_work(OopOrNarrowOopStar from, bool par) { |
342 | 89 // Must make this robust in case "from" is not in "_hr", because of |
90 // concurrency. | |
91 | |
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92 if (G1TraceHeapRegionRememberedSet) { |
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93 gclog_or_tty->print_cr(" PRT::Add_reference_work(" PTR_FORMAT "->" PTR_FORMAT").", |
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94 from, |
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95 UseCompressedOops |
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96 ? oopDesc::load_decode_heap_oop((narrowOop*)from) |
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97 : oopDesc::load_decode_heap_oop((oop*)from)); |
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98 } |
342 | 99 |
100 HeapRegion* loc_hr = hr(); | |
101 // If the test below fails, then this table was reused concurrently | |
102 // with this operation. This is OK, since the old table was coarsened, | |
103 // and adding a bit to the new table is never incorrect. | |
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104 // If the table used to belong to a continues humongous region and is |
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105 // now reused for the corresponding start humongous region, we need to |
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106 // make sure that we detect this. Thus, we call is_in_reserved_raw() |
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107 // instead of just is_in_reserved() here. |
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108 if (loc_hr->is_in_reserved_raw(from)) { |
342 | 109 size_t hw_offset = pointer_delta((HeapWord*)from, loc_hr->bottom()); |
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110 CardIdx_t from_card = (CardIdx_t) |
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111 hw_offset >> (CardTableModRefBS::card_shift - LogHeapWordSize); |
342 | 112 |
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113 assert(0 <= from_card && (size_t)from_card < HeapRegion::CardsPerRegion, |
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114 "Must be in range."); |
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115 add_card_work(from_card, par); |
342 | 116 } |
117 } | |
118 | |
119 public: | |
120 | |
121 HeapRegion* hr() const { return _hr; } | |
122 | |
123 jint occupied() const { | |
124 // Overkill, but if we ever need it... | |
125 // guarantee(_occupied == _bm.count_one_bits(), "Check"); | |
126 return _occupied; | |
127 } | |
128 | |
129 void init(HeapRegion* hr) { | |
130 _hr = hr; | |
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131 _next = NULL; |
342 | 132 _occupied = 0; |
133 _bm.clear(); | |
134 } | |
135 | |
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136 void add_reference(OopOrNarrowOopStar from) { |
342 | 137 add_reference_work(from, /*parallel*/ true); |
138 } | |
139 | |
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140 void seq_add_reference(OopOrNarrowOopStar from) { |
342 | 141 add_reference_work(from, /*parallel*/ false); |
142 } | |
143 | |
144 void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { | |
145 HeapWord* hr_bot = hr()->bottom(); | |
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146 size_t hr_first_card_index = ctbs->index_for(hr_bot); |
342 | 147 bm()->set_intersection_at_offset(*card_bm, hr_first_card_index); |
148 recount_occupied(); | |
149 } | |
150 | |
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151 void add_card(CardIdx_t from_card_index) { |
342 | 152 add_card_work(from_card_index, /*parallel*/ true); |
153 } | |
154 | |
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155 void seq_add_card(CardIdx_t from_card_index) { |
342 | 156 add_card_work(from_card_index, /*parallel*/ false); |
157 } | |
158 | |
159 // (Destructively) union the bitmap of the current table into the given | |
160 // bitmap (which is assumed to be of the same size.) | |
161 void union_bitmap_into(BitMap* bm) { | |
162 bm->set_union(_bm); | |
163 } | |
164 | |
165 // Mem size in bytes. | |
166 size_t mem_size() const { | |
167 return sizeof(this) + _bm.size_in_words() * HeapWordSize; | |
168 } | |
169 | |
170 // Requires "from" to be in "hr()". | |
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171 bool contains_reference(OopOrNarrowOopStar from) const { |
342 | 172 assert(hr()->is_in_reserved(from), "Precondition."); |
173 size_t card_ind = pointer_delta(from, hr()->bottom(), | |
174 CardTableModRefBS::card_size); | |
175 return _bm.at(card_ind); | |
176 } | |
177 | |
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178 PerRegionTable* next() const { return _next; } |
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179 void set_next(PerRegionTable* nxt) { _next = nxt; } |
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180 PerRegionTable** next_addr() { return &_next; } |
342 | 181 |
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182 static void free(PerRegionTable* prt) { |
342 | 183 while (true) { |
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184 PerRegionTable* fl = _free_list; |
342 | 185 prt->set_next(fl); |
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186 PerRegionTable* res = |
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187 (PerRegionTable*) |
342 | 188 Atomic::cmpxchg_ptr(prt, &_free_list, fl); |
189 if (res == fl) return; | |
190 } | |
191 ShouldNotReachHere(); | |
192 } | |
193 | |
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194 static PerRegionTable* alloc(HeapRegion* hr) { |
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195 PerRegionTable* fl = _free_list; |
342 | 196 while (fl != NULL) { |
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197 PerRegionTable* nxt = fl->next(); |
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198 PerRegionTable* res = |
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199 (PerRegionTable*) |
342 | 200 Atomic::cmpxchg_ptr(nxt, &_free_list, fl); |
201 if (res == fl) { | |
202 fl->init(hr); | |
203 return fl; | |
204 } else { | |
205 fl = _free_list; | |
206 } | |
207 } | |
208 assert(fl == NULL, "Loop condition."); | |
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209 return new PerRegionTable(hr); |
342 | 210 } |
211 | |
212 static size_t fl_mem_size() { | |
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213 PerRegionTable* cur = _free_list; |
342 | 214 size_t res = 0; |
215 while (cur != NULL) { | |
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216 res += sizeof(PerRegionTable); |
342 | 217 cur = cur->next(); |
218 } | |
219 return res; | |
220 } | |
221 }; | |
222 | |
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223 PerRegionTable* PerRegionTable::_free_list = NULL; |
342 | 224 |
225 size_t OtherRegionsTable::_max_fine_entries = 0; | |
226 size_t OtherRegionsTable::_mod_max_fine_entries_mask = 0; | |
227 size_t OtherRegionsTable::_fine_eviction_stride = 0; | |
228 size_t OtherRegionsTable::_fine_eviction_sample_size = 0; | |
229 | |
230 OtherRegionsTable::OtherRegionsTable(HeapRegion* hr) : | |
231 _g1h(G1CollectedHeap::heap()), | |
232 _m(Mutex::leaf, "An OtherRegionsTable lock", true), | |
233 _hr(hr), | |
234 _coarse_map(G1CollectedHeap::heap()->max_regions(), | |
235 false /* in-resource-area */), | |
236 _fine_grain_regions(NULL), | |
237 _n_fine_entries(0), _n_coarse_entries(0), | |
238 _fine_eviction_start(0), | |
239 _sparse_table(hr) | |
240 { | |
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241 typedef PerRegionTable* PerRegionTablePtr; |
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242 |
342 | 243 if (_max_fine_entries == 0) { |
244 assert(_mod_max_fine_entries_mask == 0, "Both or none."); | |
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245 size_t max_entries_log = (size_t)log2_long((jlong)G1RSetRegionEntries); |
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246 _max_fine_entries = (size_t)(1 << max_entries_log); |
342 | 247 _mod_max_fine_entries_mask = _max_fine_entries - 1; |
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248 |
342 | 249 assert(_fine_eviction_sample_size == 0 |
250 && _fine_eviction_stride == 0, "All init at same time."); | |
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251 _fine_eviction_sample_size = MAX2((size_t)4, max_entries_log); |
342 | 252 _fine_eviction_stride = _max_fine_entries / _fine_eviction_sample_size; |
253 } | |
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254 |
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255 _fine_grain_regions = new PerRegionTablePtr[_max_fine_entries]; |
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256 |
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257 if (_fine_grain_regions == NULL) { |
342 | 258 vm_exit_out_of_memory(sizeof(void*)*_max_fine_entries, |
259 "Failed to allocate _fine_grain_entries."); | |
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260 } |
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261 |
342 | 262 for (size_t i = 0; i < _max_fine_entries; i++) { |
263 _fine_grain_regions[i] = NULL; | |
264 } | |
265 } | |
266 | |
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267 int** OtherRegionsTable::_from_card_cache = NULL; |
342 | 268 size_t OtherRegionsTable::_from_card_cache_max_regions = 0; |
269 size_t OtherRegionsTable::_from_card_cache_mem_size = 0; | |
270 | |
271 void OtherRegionsTable::init_from_card_cache(size_t max_regions) { | |
272 _from_card_cache_max_regions = max_regions; | |
273 | |
274 int n_par_rs = HeapRegionRemSet::num_par_rem_sets(); | |
275 _from_card_cache = NEW_C_HEAP_ARRAY(int*, n_par_rs); | |
276 for (int i = 0; i < n_par_rs; i++) { | |
277 _from_card_cache[i] = NEW_C_HEAP_ARRAY(int, max_regions); | |
278 for (size_t j = 0; j < max_regions; j++) { | |
279 _from_card_cache[i][j] = -1; // An invalid value. | |
280 } | |
281 } | |
282 _from_card_cache_mem_size = n_par_rs * max_regions * sizeof(int); | |
283 } | |
284 | |
285 void OtherRegionsTable::shrink_from_card_cache(size_t new_n_regs) { | |
286 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
287 assert(new_n_regs <= _from_card_cache_max_regions, "Must be within max."); | |
288 for (size_t j = new_n_regs; j < _from_card_cache_max_regions; j++) { | |
289 _from_card_cache[i][j] = -1; // An invalid value. | |
290 } | |
291 } | |
292 } | |
293 | |
294 #ifndef PRODUCT | |
295 void OtherRegionsTable::print_from_card_cache() { | |
296 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
297 for (size_t j = 0; j < _from_card_cache_max_regions; j++) { | |
298 gclog_or_tty->print_cr("_from_card_cache[%d][%d] = %d.", | |
299 i, j, _from_card_cache[i][j]); | |
300 } | |
301 } | |
302 } | |
303 #endif | |
304 | |
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305 void OtherRegionsTable::add_reference(OopOrNarrowOopStar from, int tid) { |
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306 size_t cur_hrs_ind = (size_t) hr()->hrs_index(); |
342 | 307 |
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308 if (G1TraceHeapRegionRememberedSet) { |
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309 gclog_or_tty->print_cr("ORT::add_reference_work(" PTR_FORMAT "->" PTR_FORMAT ").", |
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310 from, |
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311 UseCompressedOops |
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312 ? oopDesc::load_decode_heap_oop((narrowOop*)from) |
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313 : oopDesc::load_decode_heap_oop((oop*)from)); |
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314 } |
342 | 315 |
316 int from_card = (int)(uintptr_t(from) >> CardTableModRefBS::card_shift); | |
317 | |
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318 if (G1TraceHeapRegionRememberedSet) { |
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319 gclog_or_tty->print_cr("Table for [" PTR_FORMAT "...): card %d (cache = %d)", |
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320 hr()->bottom(), from_card, |
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321 _from_card_cache[tid][cur_hrs_ind]); |
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322 } |
342 | 323 |
324 if (from_card == _from_card_cache[tid][cur_hrs_ind]) { | |
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325 if (G1TraceHeapRegionRememberedSet) { |
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326 gclog_or_tty->print_cr(" from-card cache hit."); |
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327 } |
342 | 328 assert(contains_reference(from), "We just added it!"); |
329 return; | |
330 } else { | |
331 _from_card_cache[tid][cur_hrs_ind] = from_card; | |
332 } | |
333 | |
334 // Note that this may be a continued H region. | |
335 HeapRegion* from_hr = _g1h->heap_region_containing_raw(from); | |
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336 RegionIdx_t from_hrs_ind = (RegionIdx_t) from_hr->hrs_index(); |
342 | 337 |
338 // If the region is already coarsened, return. | |
339 if (_coarse_map.at(from_hrs_ind)) { | |
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340 if (G1TraceHeapRegionRememberedSet) { |
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341 gclog_or_tty->print_cr(" coarse map hit."); |
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342 } |
342 | 343 assert(contains_reference(from), "We just added it!"); |
344 return; | |
345 } | |
346 | |
347 // Otherwise find a per-region table to add it to. | |
348 size_t ind = from_hrs_ind & _mod_max_fine_entries_mask; | |
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349 PerRegionTable* prt = find_region_table(ind, from_hr); |
342 | 350 if (prt == NULL) { |
351 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
352 // Confirm that it's really not there... | |
353 prt = find_region_table(ind, from_hr); | |
354 if (prt == NULL) { | |
355 | |
356 uintptr_t from_hr_bot_card_index = | |
357 uintptr_t(from_hr->bottom()) | |
358 >> CardTableModRefBS::card_shift; | |
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359 CardIdx_t card_index = from_card - from_hr_bot_card_index; |
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360 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
342 | 361 "Must be in range."); |
362 if (G1HRRSUseSparseTable && | |
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363 _sparse_table.add_card(from_hrs_ind, card_index)) { |
342 | 364 if (G1RecordHRRSOops) { |
365 HeapRegionRemSet::record(hr(), from); | |
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366 if (G1TraceHeapRegionRememberedSet) { |
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367 gclog_or_tty->print(" Added card " PTR_FORMAT " to region " |
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368 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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369 align_size_down(uintptr_t(from), |
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370 CardTableModRefBS::card_size), |
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371 hr()->bottom(), from); |
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372 } |
342 | 373 } |
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374 if (G1TraceHeapRegionRememberedSet) { |
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375 gclog_or_tty->print_cr(" added card to sparse table."); |
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376 } |
342 | 377 assert(contains_reference_locked(from), "We just added it!"); |
378 return; | |
379 } else { | |
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380 if (G1TraceHeapRegionRememberedSet) { |
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381 gclog_or_tty->print_cr(" [tid %d] sparse table entry " |
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382 "overflow(f: %d, t: %d)", |
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383 tid, from_hrs_ind, cur_hrs_ind); |
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384 } |
342 | 385 } |
386 | |
387 if (_n_fine_entries == _max_fine_entries) { | |
388 prt = delete_region_table(); | |
389 } else { | |
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390 prt = PerRegionTable::alloc(from_hr); |
342 | 391 } |
392 prt->init(from_hr); | |
393 | |
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394 PerRegionTable* first_prt = _fine_grain_regions[ind]; |
342 | 395 prt->set_next(first_prt); // XXX Maybe move to init? |
396 _fine_grain_regions[ind] = prt; | |
397 _n_fine_entries++; | |
398 | |
399 if (G1HRRSUseSparseTable) { | |
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400 // Transfer from sparse to fine-grain. |
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401 SparsePRTEntry *sprt_entry = _sparse_table.get_entry(from_hrs_ind); |
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402 assert(sprt_entry != NULL, "There should have been an entry"); |
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403 for (int i = 0; i < SparsePRTEntry::cards_num(); i++) { |
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404 CardIdx_t c = sprt_entry->card(i); |
342 | 405 if (c != SparsePRTEntry::NullEntry) { |
406 prt->add_card(c); | |
407 } | |
408 } | |
409 // Now we can delete the sparse entry. | |
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410 bool res = _sparse_table.delete_entry(from_hrs_ind); |
342 | 411 assert(res, "It should have been there."); |
412 } | |
413 } | |
414 assert(prt != NULL && prt->hr() == from_hr, "consequence"); | |
415 } | |
416 // Note that we can't assert "prt->hr() == from_hr", because of the | |
417 // possibility of concurrent reuse. But see head comment of | |
418 // OtherRegionsTable for why this is OK. | |
419 assert(prt != NULL, "Inv"); | |
420 | |
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421 prt->add_reference(from); |
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422 |
342 | 423 if (G1RecordHRRSOops) { |
424 HeapRegionRemSet::record(hr(), from); | |
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425 if (G1TraceHeapRegionRememberedSet) { |
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426 gclog_or_tty->print("Added card " PTR_FORMAT " to region " |
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427 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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428 align_size_down(uintptr_t(from), |
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429 CardTableModRefBS::card_size), |
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430 hr()->bottom(), from); |
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431 } |
342 | 432 } |
433 assert(contains_reference(from), "We just added it!"); | |
434 } | |
435 | |
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436 PerRegionTable* |
342 | 437 OtherRegionsTable::find_region_table(size_t ind, HeapRegion* hr) const { |
438 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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439 PerRegionTable* prt = _fine_grain_regions[ind]; |
342 | 440 while (prt != NULL && prt->hr() != hr) { |
441 prt = prt->next(); | |
442 } | |
443 // Loop postcondition is the method postcondition. | |
444 return prt; | |
445 } | |
446 | |
447 jint OtherRegionsTable::_n_coarsenings = 0; | |
448 | |
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449 PerRegionTable* OtherRegionsTable::delete_region_table() { |
342 | 450 assert(_m.owned_by_self(), "Precondition"); |
451 assert(_n_fine_entries == _max_fine_entries, "Precondition"); | |
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452 PerRegionTable* max = NULL; |
342 | 453 jint max_occ = 0; |
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454 PerRegionTable** max_prev; |
342 | 455 size_t max_ind; |
456 | |
457 size_t i = _fine_eviction_start; | |
458 for (size_t k = 0; k < _fine_eviction_sample_size; k++) { | |
459 size_t ii = i; | |
460 // Make sure we get a non-NULL sample. | |
461 while (_fine_grain_regions[ii] == NULL) { | |
462 ii++; | |
463 if (ii == _max_fine_entries) ii = 0; | |
464 guarantee(ii != i, "We must find one."); | |
465 } | |
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466 PerRegionTable** prev = &_fine_grain_regions[ii]; |
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467 PerRegionTable* cur = *prev; |
342 | 468 while (cur != NULL) { |
469 jint cur_occ = cur->occupied(); | |
470 if (max == NULL || cur_occ > max_occ) { | |
471 max = cur; | |
472 max_prev = prev; | |
473 max_ind = i; | |
474 max_occ = cur_occ; | |
475 } | |
476 prev = cur->next_addr(); | |
477 cur = cur->next(); | |
478 } | |
479 i = i + _fine_eviction_stride; | |
480 if (i >= _n_fine_entries) i = i - _n_fine_entries; | |
481 } | |
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482 |
342 | 483 _fine_eviction_start++; |
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484 |
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485 if (_fine_eviction_start >= _n_fine_entries) { |
342 | 486 _fine_eviction_start -= _n_fine_entries; |
487 } | |
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488 |
342 | 489 guarantee(max != NULL, "Since _n_fine_entries > 0"); |
490 | |
491 // Set the corresponding coarse bit. | |
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492 size_t max_hrs_index = (size_t) max->hr()->hrs_index(); |
342 | 493 if (!_coarse_map.at(max_hrs_index)) { |
494 _coarse_map.at_put(max_hrs_index, true); | |
495 _n_coarse_entries++; | |
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496 if (G1TraceHeapRegionRememberedSet) { |
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497 gclog_or_tty->print("Coarsened entry in region [" PTR_FORMAT "...] " |
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498 "for region [" PTR_FORMAT "...] (%d coarse entries).\n", |
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499 hr()->bottom(), |
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500 max->hr()->bottom(), |
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501 _n_coarse_entries); |
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502 } |
342 | 503 } |
504 | |
505 // Unsplice. | |
506 *max_prev = max->next(); | |
507 Atomic::inc(&_n_coarsenings); | |
508 _n_fine_entries--; | |
509 return max; | |
510 } | |
511 | |
512 | |
513 // At present, this must be called stop-world single-threaded. | |
514 void OtherRegionsTable::scrub(CardTableModRefBS* ctbs, | |
515 BitMap* region_bm, BitMap* card_bm) { | |
516 // First eliminated garbage regions from the coarse map. | |
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517 if (G1RSScrubVerbose) { |
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518 gclog_or_tty->print_cr("Scrubbing region %u:", hr()->hrs_index()); |
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519 } |
342 | 520 |
521 assert(_coarse_map.size() == region_bm->size(), "Precondition"); | |
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522 if (G1RSScrubVerbose) { |
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523 gclog_or_tty->print(" Coarse map: before = "SIZE_FORMAT"...", |
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524 _n_coarse_entries); |
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525 } |
342 | 526 _coarse_map.set_intersection(*region_bm); |
527 _n_coarse_entries = _coarse_map.count_one_bits(); | |
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528 if (G1RSScrubVerbose) { |
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529 gclog_or_tty->print_cr(" after = "SIZE_FORMAT".", _n_coarse_entries); |
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530 } |
342 | 531 |
532 // Now do the fine-grained maps. | |
533 for (size_t i = 0; i < _max_fine_entries; i++) { | |
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534 PerRegionTable* cur = _fine_grain_regions[i]; |
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535 PerRegionTable** prev = &_fine_grain_regions[i]; |
342 | 536 while (cur != NULL) { |
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537 PerRegionTable* nxt = cur->next(); |
342 | 538 // If the entire region is dead, eliminate. |
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539 if (G1RSScrubVerbose) { |
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540 gclog_or_tty->print_cr(" For other region %u:", |
3766 | 541 cur->hr()->hrs_index()); |
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542 } |
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543 if (!region_bm->at((size_t) cur->hr()->hrs_index())) { |
342 | 544 *prev = nxt; |
545 cur->set_next(NULL); | |
546 _n_fine_entries--; | |
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547 if (G1RSScrubVerbose) { |
342 | 548 gclog_or_tty->print_cr(" deleted via region map."); |
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549 } |
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550 PerRegionTable::free(cur); |
342 | 551 } else { |
552 // Do fine-grain elimination. | |
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553 if (G1RSScrubVerbose) { |
342 | 554 gclog_or_tty->print(" occ: before = %4d.", cur->occupied()); |
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555 } |
342 | 556 cur->scrub(ctbs, card_bm); |
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557 if (G1RSScrubVerbose) { |
342 | 558 gclog_or_tty->print_cr(" after = %4d.", cur->occupied()); |
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559 } |
342 | 560 // Did that empty the table completely? |
561 if (cur->occupied() == 0) { | |
562 *prev = nxt; | |
563 cur->set_next(NULL); | |
564 _n_fine_entries--; | |
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565 PerRegionTable::free(cur); |
342 | 566 } else { |
567 prev = cur->next_addr(); | |
568 } | |
569 } | |
570 cur = nxt; | |
571 } | |
572 } | |
573 // Since we may have deleted a from_card_cache entry from the RS, clear | |
574 // the FCC. | |
575 clear_fcc(); | |
576 } | |
577 | |
578 | |
579 size_t OtherRegionsTable::occupied() const { | |
580 // Cast away const in this case. | |
581 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
582 size_t sum = occ_fine(); | |
583 sum += occ_sparse(); | |
584 sum += occ_coarse(); | |
585 return sum; | |
586 } | |
587 | |
588 size_t OtherRegionsTable::occ_fine() const { | |
589 size_t sum = 0; | |
590 for (size_t i = 0; i < _max_fine_entries; i++) { | |
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591 PerRegionTable* cur = _fine_grain_regions[i]; |
342 | 592 while (cur != NULL) { |
593 sum += cur->occupied(); | |
594 cur = cur->next(); | |
595 } | |
596 } | |
597 return sum; | |
598 } | |
599 | |
600 size_t OtherRegionsTable::occ_coarse() const { | |
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601 return (_n_coarse_entries * HeapRegion::CardsPerRegion); |
342 | 602 } |
603 | |
604 size_t OtherRegionsTable::occ_sparse() const { | |
605 return _sparse_table.occupied(); | |
606 } | |
607 | |
608 size_t OtherRegionsTable::mem_size() const { | |
609 // Cast away const in this case. | |
610 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
611 size_t sum = 0; | |
612 for (size_t i = 0; i < _max_fine_entries; i++) { | |
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613 PerRegionTable* cur = _fine_grain_regions[i]; |
342 | 614 while (cur != NULL) { |
615 sum += cur->mem_size(); | |
616 cur = cur->next(); | |
617 } | |
618 } | |
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619 sum += (sizeof(PerRegionTable*) * _max_fine_entries); |
342 | 620 sum += (_coarse_map.size_in_words() * HeapWordSize); |
621 sum += (_sparse_table.mem_size()); | |
622 sum += sizeof(*this) - sizeof(_sparse_table); // Avoid double counting above. | |
623 return sum; | |
624 } | |
625 | |
626 size_t OtherRegionsTable::static_mem_size() { | |
627 return _from_card_cache_mem_size; | |
628 } | |
629 | |
630 size_t OtherRegionsTable::fl_mem_size() { | |
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631 return PerRegionTable::fl_mem_size(); |
342 | 632 } |
633 | |
634 void OtherRegionsTable::clear_fcc() { | |
635 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
636 _from_card_cache[i][hr()->hrs_index()] = -1; | |
637 } | |
638 } | |
639 | |
640 void OtherRegionsTable::clear() { | |
641 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
642 for (size_t i = 0; i < _max_fine_entries; i++) { | |
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643 PerRegionTable* cur = _fine_grain_regions[i]; |
342 | 644 while (cur != NULL) { |
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645 PerRegionTable* nxt = cur->next(); |
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646 PerRegionTable::free(cur); |
342 | 647 cur = nxt; |
648 } | |
649 _fine_grain_regions[i] = NULL; | |
650 } | |
651 _sparse_table.clear(); | |
652 _coarse_map.clear(); | |
653 _n_fine_entries = 0; | |
654 _n_coarse_entries = 0; | |
655 | |
656 clear_fcc(); | |
657 } | |
658 | |
659 void OtherRegionsTable::clear_incoming_entry(HeapRegion* from_hr) { | |
660 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
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661 size_t hrs_ind = (size_t) from_hr->hrs_index(); |
342 | 662 size_t ind = hrs_ind & _mod_max_fine_entries_mask; |
663 if (del_single_region_table(ind, from_hr)) { | |
664 assert(!_coarse_map.at(hrs_ind), "Inv"); | |
665 } else { | |
666 _coarse_map.par_at_put(hrs_ind, 0); | |
667 } | |
668 // Check to see if any of the fcc entries come from here. | |
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669 size_t hr_ind = (size_t) hr()->hrs_index(); |
342 | 670 for (int tid = 0; tid < HeapRegionRemSet::num_par_rem_sets(); tid++) { |
671 int fcc_ent = _from_card_cache[tid][hr_ind]; | |
672 if (fcc_ent != -1) { | |
673 HeapWord* card_addr = (HeapWord*) | |
674 (uintptr_t(fcc_ent) << CardTableModRefBS::card_shift); | |
675 if (hr()->is_in_reserved(card_addr)) { | |
676 // Clear the from card cache. | |
677 _from_card_cache[tid][hr_ind] = -1; | |
678 } | |
679 } | |
680 } | |
681 } | |
682 | |
683 bool OtherRegionsTable::del_single_region_table(size_t ind, | |
684 HeapRegion* hr) { | |
685 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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686 PerRegionTable** prev_addr = &_fine_grain_regions[ind]; |
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687 PerRegionTable* prt = *prev_addr; |
342 | 688 while (prt != NULL && prt->hr() != hr) { |
689 prev_addr = prt->next_addr(); | |
690 prt = prt->next(); | |
691 } | |
692 if (prt != NULL) { | |
693 assert(prt->hr() == hr, "Loop postcondition."); | |
694 *prev_addr = prt->next(); | |
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695 PerRegionTable::free(prt); |
342 | 696 _n_fine_entries--; |
697 return true; | |
698 } else { | |
699 return false; | |
700 } | |
701 } | |
702 | |
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703 bool OtherRegionsTable::contains_reference(OopOrNarrowOopStar from) const { |
342 | 704 // Cast away const in this case. |
705 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
706 return contains_reference_locked(from); | |
707 } | |
708 | |
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709 bool OtherRegionsTable::contains_reference_locked(OopOrNarrowOopStar from) const { |
342 | 710 HeapRegion* hr = _g1h->heap_region_containing_raw(from); |
711 if (hr == NULL) return false; | |
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712 RegionIdx_t hr_ind = (RegionIdx_t) hr->hrs_index(); |
342 | 713 // Is this region in the coarse map? |
714 if (_coarse_map.at(hr_ind)) return true; | |
715 | |
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716 PerRegionTable* prt = find_region_table(hr_ind & _mod_max_fine_entries_mask, |
342 | 717 hr); |
718 if (prt != NULL) { | |
719 return prt->contains_reference(from); | |
720 | |
721 } else { | |
722 uintptr_t from_card = | |
723 (uintptr_t(from) >> CardTableModRefBS::card_shift); | |
724 uintptr_t hr_bot_card_index = | |
725 uintptr_t(hr->bottom()) >> CardTableModRefBS::card_shift; | |
726 assert(from_card >= hr_bot_card_index, "Inv"); | |
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727 CardIdx_t card_index = from_card - hr_bot_card_index; |
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728 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
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729 "Must be in range."); |
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730 return _sparse_table.contains_card(hr_ind, card_index); |
342 | 731 } |
732 | |
733 | |
734 } | |
735 | |
2173 | 736 void |
737 OtherRegionsTable::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
738 _sparse_table.do_cleanup_work(hrrs_cleanup_task); | |
739 } | |
740 | |
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741 // Determines how many threads can add records to an rset in parallel. |
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742 // This can be done by either mutator threads together with the |
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743 // concurrent refinement threads or GC threads. |
342 | 744 int HeapRegionRemSet::num_par_rem_sets() { |
795
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745 return (int)MAX2(DirtyCardQueueSet::num_par_ids() + ConcurrentG1Refine::thread_num(), ParallelGCThreads); |
342 | 746 } |
747 | |
748 HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, | |
749 HeapRegion* hr) | |
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750 : _bosa(bosa), _other_regions(hr) { |
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751 reset_for_par_iteration(); |
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752 } |
342 | 753 |
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754 void HeapRegionRemSet::setup_remset_size() { |
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755 // Setup sparse and fine-grain tables sizes. |
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756 // table_size = base * (log(region_size / 1M) + 1) |
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757 const int LOG_M = 20; |
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758 int region_size_log_mb = MAX2(HeapRegion::LogOfHRGrainBytes - LOG_M, 0); |
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759 if (FLAG_IS_DEFAULT(G1RSetSparseRegionEntries)) { |
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760 G1RSetSparseRegionEntries = G1RSetSparseRegionEntriesBase * (region_size_log_mb + 1); |
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761 } |
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762 if (FLAG_IS_DEFAULT(G1RSetRegionEntries)) { |
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763 G1RSetRegionEntries = G1RSetRegionEntriesBase * (region_size_log_mb + 1); |
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764 } |
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765 guarantee(G1RSetSparseRegionEntries > 0 && G1RSetRegionEntries > 0 , "Sanity"); |
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766 } |
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767 |
342 | 768 bool HeapRegionRemSet::claim_iter() { |
769 if (_iter_state != Unclaimed) return false; | |
770 jint res = Atomic::cmpxchg(Claimed, (jint*)(&_iter_state), Unclaimed); | |
771 return (res == Unclaimed); | |
772 } | |
773 | |
774 void HeapRegionRemSet::set_iter_complete() { | |
775 _iter_state = Complete; | |
776 } | |
777 | |
778 bool HeapRegionRemSet::iter_is_complete() { | |
779 return _iter_state == Complete; | |
780 } | |
781 | |
782 void HeapRegionRemSet::init_iterator(HeapRegionRemSetIterator* iter) const { | |
783 iter->initialize(this); | |
784 } | |
785 | |
786 #ifndef PRODUCT | |
787 void HeapRegionRemSet::print() const { | |
788 HeapRegionRemSetIterator iter; | |
789 init_iterator(&iter); | |
790 size_t card_index; | |
791 while (iter.has_next(card_index)) { | |
792 HeapWord* card_start = | |
793 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
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794 gclog_or_tty->print_cr(" Card " PTR_FORMAT, card_start); |
342 | 795 } |
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796 |
342 | 797 if (iter.n_yielded() != occupied()) { |
798 gclog_or_tty->print_cr("Yielded disagrees with occupied:"); | |
799 gclog_or_tty->print_cr(" %6d yielded (%6d coarse, %6d fine).", | |
800 iter.n_yielded(), | |
801 iter.n_yielded_coarse(), iter.n_yielded_fine()); | |
802 gclog_or_tty->print_cr(" %6d occ (%6d coarse, %6d fine).", | |
803 occupied(), occ_coarse(), occ_fine()); | |
804 } | |
805 guarantee(iter.n_yielded() == occupied(), | |
806 "We should have yielded all the represented cards."); | |
807 } | |
808 #endif | |
809 | |
810 void HeapRegionRemSet::cleanup() { | |
811 SparsePRT::cleanup_all(); | |
812 } | |
813 | |
814 void HeapRegionRemSet::clear() { | |
815 _other_regions.clear(); | |
816 assert(occupied() == 0, "Should be clear."); | |
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817 reset_for_par_iteration(); |
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818 } |
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819 |
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820 void HeapRegionRemSet::reset_for_par_iteration() { |
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821 _iter_state = Unclaimed; |
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822 _iter_claimed = 0; |
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823 // It's good to check this to make sure that the two methods are in sync. |
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824 assert(verify_ready_for_par_iteration(), "post-condition"); |
342 | 825 } |
826 | |
827 void HeapRegionRemSet::scrub(CardTableModRefBS* ctbs, | |
828 BitMap* region_bm, BitMap* card_bm) { | |
829 _other_regions.scrub(ctbs, region_bm, card_bm); | |
830 } | |
831 | |
832 //-------------------- Iteration -------------------- | |
833 | |
834 HeapRegionRemSetIterator:: | |
835 HeapRegionRemSetIterator() : | |
836 _hrrs(NULL), | |
837 _g1h(G1CollectedHeap::heap()), | |
838 _bosa(NULL), | |
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839 _sparse_iter() { } |
342 | 840 |
841 void HeapRegionRemSetIterator::initialize(const HeapRegionRemSet* hrrs) { | |
842 _hrrs = hrrs; | |
843 _coarse_map = &_hrrs->_other_regions._coarse_map; | |
844 _fine_grain_regions = _hrrs->_other_regions._fine_grain_regions; | |
845 _bosa = _hrrs->bosa(); | |
846 | |
847 _is = Sparse; | |
848 // Set these values so that we increment to the first region. | |
849 _coarse_cur_region_index = -1; | |
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850 _coarse_cur_region_cur_card = (HeapRegion::CardsPerRegion-1); |
342 | 851 |
852 _cur_region_cur_card = 0; | |
853 | |
854 _fine_array_index = -1; | |
855 _fine_cur_prt = NULL; | |
856 | |
857 _n_yielded_coarse = 0; | |
858 _n_yielded_fine = 0; | |
859 _n_yielded_sparse = 0; | |
860 | |
861 _sparse_iter.init(&hrrs->_other_regions._sparse_table); | |
862 } | |
863 | |
864 bool HeapRegionRemSetIterator::coarse_has_next(size_t& card_index) { | |
865 if (_hrrs->_other_regions._n_coarse_entries == 0) return false; | |
866 // Go to the next card. | |
867 _coarse_cur_region_cur_card++; | |
868 // Was the last the last card in the current region? | |
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869 if (_coarse_cur_region_cur_card == HeapRegion::CardsPerRegion) { |
342 | 870 // Yes: find the next region. This may leave _coarse_cur_region_index |
871 // Set to the last index, in which case there are no more coarse | |
872 // regions. | |
873 _coarse_cur_region_index = | |
874 (int) _coarse_map->get_next_one_offset(_coarse_cur_region_index + 1); | |
875 if ((size_t)_coarse_cur_region_index < _coarse_map->size()) { | |
876 _coarse_cur_region_cur_card = 0; | |
877 HeapWord* r_bot = | |
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878 _g1h->region_at((uint) _coarse_cur_region_index)->bottom(); |
342 | 879 _cur_region_card_offset = _bosa->index_for(r_bot); |
880 } else { | |
881 return false; | |
882 } | |
883 } | |
884 // If we didn't return false above, then we can yield a card. | |
885 card_index = _cur_region_card_offset + _coarse_cur_region_cur_card; | |
886 return true; | |
887 } | |
888 | |
889 void HeapRegionRemSetIterator::fine_find_next_non_null_prt() { | |
890 // Otherwise, find the next bucket list in the array. | |
891 _fine_array_index++; | |
892 while (_fine_array_index < (int) OtherRegionsTable::_max_fine_entries) { | |
893 _fine_cur_prt = _fine_grain_regions[_fine_array_index]; | |
894 if (_fine_cur_prt != NULL) return; | |
895 else _fine_array_index++; | |
896 } | |
897 assert(_fine_cur_prt == NULL, "Loop post"); | |
898 } | |
899 | |
900 bool HeapRegionRemSetIterator::fine_has_next(size_t& card_index) { | |
901 if (fine_has_next()) { | |
902 _cur_region_cur_card = | |
903 _fine_cur_prt->_bm.get_next_one_offset(_cur_region_cur_card + 1); | |
904 } | |
905 while (!fine_has_next()) { | |
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906 if (_cur_region_cur_card == (size_t) HeapRegion::CardsPerRegion) { |
342 | 907 _cur_region_cur_card = 0; |
908 _fine_cur_prt = _fine_cur_prt->next(); | |
909 } | |
910 if (_fine_cur_prt == NULL) { | |
911 fine_find_next_non_null_prt(); | |
912 if (_fine_cur_prt == NULL) return false; | |
913 } | |
914 assert(_fine_cur_prt != NULL && _cur_region_cur_card == 0, | |
915 "inv."); | |
916 HeapWord* r_bot = | |
917 _fine_cur_prt->hr()->bottom(); | |
918 _cur_region_card_offset = _bosa->index_for(r_bot); | |
919 _cur_region_cur_card = _fine_cur_prt->_bm.get_next_one_offset(0); | |
920 } | |
921 assert(fine_has_next(), "Or else we exited the loop via the return."); | |
922 card_index = _cur_region_card_offset + _cur_region_cur_card; | |
923 return true; | |
924 } | |
925 | |
926 bool HeapRegionRemSetIterator::fine_has_next() { | |
927 return | |
928 _fine_cur_prt != NULL && | |
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929 _cur_region_cur_card < HeapRegion::CardsPerRegion; |
342 | 930 } |
931 | |
932 bool HeapRegionRemSetIterator::has_next(size_t& card_index) { | |
933 switch (_is) { | |
934 case Sparse: | |
935 if (_sparse_iter.has_next(card_index)) { | |
936 _n_yielded_sparse++; | |
937 return true; | |
938 } | |
939 // Otherwise, deliberate fall-through | |
940 _is = Fine; | |
941 case Fine: | |
942 if (fine_has_next(card_index)) { | |
943 _n_yielded_fine++; | |
944 return true; | |
945 } | |
946 // Otherwise, deliberate fall-through | |
947 _is = Coarse; | |
948 case Coarse: | |
949 if (coarse_has_next(card_index)) { | |
950 _n_yielded_coarse++; | |
951 return true; | |
952 } | |
953 // Otherwise... | |
954 break; | |
955 } | |
956 assert(ParallelGCThreads > 1 || | |
957 n_yielded() == _hrrs->occupied(), | |
958 "Should have yielded all the cards in the rem set " | |
959 "(in the non-par case)."); | |
960 return false; | |
961 } | |
962 | |
963 | |
964 | |
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965 OopOrNarrowOopStar* HeapRegionRemSet::_recorded_oops = NULL; |
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966 HeapWord** HeapRegionRemSet::_recorded_cards = NULL; |
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967 HeapRegion** HeapRegionRemSet::_recorded_regions = NULL; |
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968 int HeapRegionRemSet::_n_recorded = 0; |
342 | 969 |
970 HeapRegionRemSet::Event* HeapRegionRemSet::_recorded_events = NULL; | |
971 int* HeapRegionRemSet::_recorded_event_index = NULL; | |
972 int HeapRegionRemSet::_n_recorded_events = 0; | |
973 | |
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974 void HeapRegionRemSet::record(HeapRegion* hr, OopOrNarrowOopStar f) { |
342 | 975 if (_recorded_oops == NULL) { |
976 assert(_n_recorded == 0 | |
977 && _recorded_cards == NULL | |
978 && _recorded_regions == NULL, | |
979 "Inv"); | |
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980 _recorded_oops = NEW_C_HEAP_ARRAY(OopOrNarrowOopStar, MaxRecorded); |
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981 _recorded_cards = NEW_C_HEAP_ARRAY(HeapWord*, MaxRecorded); |
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982 _recorded_regions = NEW_C_HEAP_ARRAY(HeapRegion*, MaxRecorded); |
342 | 983 } |
984 if (_n_recorded == MaxRecorded) { | |
985 gclog_or_tty->print_cr("Filled up 'recorded' (%d).", MaxRecorded); | |
986 } else { | |
987 _recorded_cards[_n_recorded] = | |
988 (HeapWord*)align_size_down(uintptr_t(f), | |
989 CardTableModRefBS::card_size); | |
990 _recorded_oops[_n_recorded] = f; | |
991 _recorded_regions[_n_recorded] = hr; | |
992 _n_recorded++; | |
993 } | |
994 } | |
995 | |
996 void HeapRegionRemSet::record_event(Event evnt) { | |
997 if (!G1RecordHRRSEvents) return; | |
998 | |
999 if (_recorded_events == NULL) { | |
1000 assert(_n_recorded_events == 0 | |
1001 && _recorded_event_index == NULL, | |
1002 "Inv"); | |
1003 _recorded_events = NEW_C_HEAP_ARRAY(Event, MaxRecordedEvents); | |
1004 _recorded_event_index = NEW_C_HEAP_ARRAY(int, MaxRecordedEvents); | |
1005 } | |
1006 if (_n_recorded_events == MaxRecordedEvents) { | |
1007 gclog_or_tty->print_cr("Filled up 'recorded_events' (%d).", MaxRecordedEvents); | |
1008 } else { | |
1009 _recorded_events[_n_recorded_events] = evnt; | |
1010 _recorded_event_index[_n_recorded_events] = _n_recorded; | |
1011 _n_recorded_events++; | |
1012 } | |
1013 } | |
1014 | |
1015 void HeapRegionRemSet::print_event(outputStream* str, Event evnt) { | |
1016 switch (evnt) { | |
1017 case Event_EvacStart: | |
1018 str->print("Evac Start"); | |
1019 break; | |
1020 case Event_EvacEnd: | |
1021 str->print("Evac End"); | |
1022 break; | |
1023 case Event_RSUpdateEnd: | |
1024 str->print("RS Update End"); | |
1025 break; | |
1026 } | |
1027 } | |
1028 | |
1029 void HeapRegionRemSet::print_recorded() { | |
1030 int cur_evnt = 0; | |
1031 Event cur_evnt_kind; | |
1032 int cur_evnt_ind = 0; | |
1033 if (_n_recorded_events > 0) { | |
1034 cur_evnt_kind = _recorded_events[cur_evnt]; | |
1035 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
1036 } | |
1037 | |
1038 for (int i = 0; i < _n_recorded; i++) { | |
1039 while (cur_evnt < _n_recorded_events && i == cur_evnt_ind) { | |
1040 gclog_or_tty->print("Event: "); | |
1041 print_event(gclog_or_tty, cur_evnt_kind); | |
1042 gclog_or_tty->print_cr(""); | |
1043 cur_evnt++; | |
1044 if (cur_evnt < MaxRecordedEvents) { | |
1045 cur_evnt_kind = _recorded_events[cur_evnt]; | |
1046 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
1047 } | |
1048 } | |
1049 gclog_or_tty->print("Added card " PTR_FORMAT " to region [" PTR_FORMAT "...]" | |
1050 " for ref " PTR_FORMAT ".\n", | |
1051 _recorded_cards[i], _recorded_regions[i]->bottom(), | |
1052 _recorded_oops[i]); | |
1053 } | |
1054 } | |
1055 | |
2173 | 1056 void HeapRegionRemSet::reset_for_cleanup_tasks() { |
1057 SparsePRT::reset_for_cleanup_tasks(); | |
1058 } | |
1059 | |
1060 void HeapRegionRemSet::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
1061 _other_regions.do_cleanup_work(hrrs_cleanup_task); | |
1062 } | |
1063 | |
1064 void | |
1065 HeapRegionRemSet::finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task) { | |
1066 SparsePRT::finish_cleanup_task(hrrs_cleanup_task); | |
1067 } | |
1068 | |
342 | 1069 #ifndef PRODUCT |
1070 void HeapRegionRemSet::test() { | |
1071 os::sleep(Thread::current(), (jlong)5000, false); | |
1072 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1073 | |
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1074 // Run with "-XX:G1LogRSetRegionEntries=2", so that 1 and 5 end up in same |
342 | 1075 // hash bucket. |
1076 HeapRegion* hr0 = g1h->region_at(0); | |
1077 HeapRegion* hr1 = g1h->region_at(1); | |
1078 HeapRegion* hr2 = g1h->region_at(5); | |
1079 HeapRegion* hr3 = g1h->region_at(6); | |
1080 HeapRegion* hr4 = g1h->region_at(7); | |
1081 HeapRegion* hr5 = g1h->region_at(8); | |
1082 | |
1083 HeapWord* hr1_start = hr1->bottom(); | |
1084 HeapWord* hr1_mid = hr1_start + HeapRegion::GrainWords/2; | |
1085 HeapWord* hr1_last = hr1->end() - 1; | |
1086 | |
1087 HeapWord* hr2_start = hr2->bottom(); | |
1088 HeapWord* hr2_mid = hr2_start + HeapRegion::GrainWords/2; | |
1089 HeapWord* hr2_last = hr2->end() - 1; | |
1090 | |
1091 HeapWord* hr3_start = hr3->bottom(); | |
1092 HeapWord* hr3_mid = hr3_start + HeapRegion::GrainWords/2; | |
1093 HeapWord* hr3_last = hr3->end() - 1; | |
1094 | |
1095 HeapRegionRemSet* hrrs = hr0->rem_set(); | |
1096 | |
1097 // Make three references from region 0x101... | |
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1098 hrrs->add_reference((OopOrNarrowOopStar)hr1_start); |
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1099 hrrs->add_reference((OopOrNarrowOopStar)hr1_mid); |
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1100 hrrs->add_reference((OopOrNarrowOopStar)hr1_last); |
342 | 1101 |
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1102 hrrs->add_reference((OopOrNarrowOopStar)hr2_start); |
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1103 hrrs->add_reference((OopOrNarrowOopStar)hr2_mid); |
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1104 hrrs->add_reference((OopOrNarrowOopStar)hr2_last); |
342 | 1105 |
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1106 hrrs->add_reference((OopOrNarrowOopStar)hr3_start); |
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1107 hrrs->add_reference((OopOrNarrowOopStar)hr3_mid); |
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1108 hrrs->add_reference((OopOrNarrowOopStar)hr3_last); |
342 | 1109 |
1110 // Now cause a coarsening. | |
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1111 hrrs->add_reference((OopOrNarrowOopStar)hr4->bottom()); |
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1112 hrrs->add_reference((OopOrNarrowOopStar)hr5->bottom()); |
342 | 1113 |
1114 // Now, does iteration yield these three? | |
1115 HeapRegionRemSetIterator iter; | |
1116 hrrs->init_iterator(&iter); | |
1117 size_t sum = 0; | |
1118 size_t card_index; | |
1119 while (iter.has_next(card_index)) { | |
1120 HeapWord* card_start = | |
1121 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
1122 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); | |
1123 sum++; | |
1124 } | |
1125 guarantee(sum == 11 - 3 + 2048, "Failure"); | |
1126 guarantee(sum == hrrs->occupied(), "Failure"); | |
1127 } | |
1128 #endif |