Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp @ 10293:2958af1d8c5a
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author | jwilhelm |
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date | Fri, 17 May 2013 06:01:10 +0200 |
parents | f9be75d21404 05a17f270c7e |
children | 6702da6b6082 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2013, 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 |
6197 | 37 class PerRegionTable: public CHeapObj<mtGC> { |
342 | 38 friend class OtherRegionsTable; |
39 friend class HeapRegionRemSetIterator; | |
40 | |
41 HeapRegion* _hr; | |
42 BitMap _bm; | |
43 jint _occupied; | |
44 | |
6253 | 45 // next pointer for free/allocated 'all' list |
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46 PerRegionTable* _next; |
342 | 47 |
6253 | 48 // prev pointer for the allocated 'all' list |
49 PerRegionTable* _prev; | |
342 | 50 |
6253 | 51 // next pointer in collision list |
52 PerRegionTable * _collision_list_next; | |
342 | 53 |
6253 | 54 // Global free list of PRTs |
55 static PerRegionTable* _free_list; | |
342 | 56 |
57 protected: | |
58 // We need access in order to union things into the base table. | |
59 BitMap* bm() { return &_bm; } | |
60 | |
61 void recount_occupied() { | |
62 _occupied = (jint) bm()->count_one_bits(); | |
63 } | |
64 | |
65 PerRegionTable(HeapRegion* hr) : | |
66 _hr(hr), | |
67 _occupied(0), | |
6253 | 68 _bm(HeapRegion::CardsPerRegion, false /* in-resource-area */), |
69 _collision_list_next(NULL), _next(NULL), _prev(NULL) | |
342 | 70 {} |
71 | |
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72 void add_card_work(CardIdx_t from_card, bool par) { |
342 | 73 if (!_bm.at(from_card)) { |
74 if (par) { | |
75 if (_bm.par_at_put(from_card, 1)) { | |
76 Atomic::inc(&_occupied); | |
77 } | |
78 } else { | |
79 _bm.at_put(from_card, 1); | |
80 _occupied++; | |
81 } | |
82 } | |
83 } | |
84 | |
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85 void add_reference_work(OopOrNarrowOopStar from, bool par) { |
342 | 86 // Must make this robust in case "from" is not in "_hr", because of |
87 // concurrency. | |
88 | |
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89 if (G1TraceHeapRegionRememberedSet) { |
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90 gclog_or_tty->print_cr(" PRT::Add_reference_work(" PTR_FORMAT "->" PTR_FORMAT").", |
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91 from, |
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92 UseCompressedOops |
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93 ? oopDesc::load_decode_heap_oop((narrowOop*)from) |
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94 : oopDesc::load_decode_heap_oop((oop*)from)); |
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95 } |
342 | 96 |
97 HeapRegion* loc_hr = hr(); | |
98 // If the test below fails, then this table was reused concurrently | |
99 // with this operation. This is OK, since the old table was coarsened, | |
100 // and adding a bit to the new table is never incorrect. | |
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101 // If the table used to belong to a continues humongous region and is |
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102 // now reused for the corresponding start humongous region, we need to |
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103 // make sure that we detect this. Thus, we call is_in_reserved_raw() |
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104 // instead of just is_in_reserved() here. |
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105 if (loc_hr->is_in_reserved_raw(from)) { |
342 | 106 size_t hw_offset = pointer_delta((HeapWord*)from, loc_hr->bottom()); |
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107 CardIdx_t from_card = (CardIdx_t) |
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108 hw_offset >> (CardTableModRefBS::card_shift - LogHeapWordSize); |
342 | 109 |
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110 assert(0 <= from_card && (size_t)from_card < HeapRegion::CardsPerRegion, |
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111 "Must be in range."); |
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112 add_card_work(from_card, par); |
342 | 113 } |
114 } | |
115 | |
116 public: | |
117 | |
118 HeapRegion* hr() const { return _hr; } | |
119 | |
120 jint occupied() const { | |
121 // Overkill, but if we ever need it... | |
122 // guarantee(_occupied == _bm.count_one_bits(), "Check"); | |
123 return _occupied; | |
124 } | |
125 | |
6253 | 126 void init(HeapRegion* hr, bool clear_links_to_all_list) { |
127 if (clear_links_to_all_list) { | |
128 set_next(NULL); | |
129 set_prev(NULL); | |
130 } | |
342 | 131 _hr = hr; |
6253 | 132 _collision_list_next = NULL; |
342 | 133 _occupied = 0; |
134 _bm.clear(); | |
135 } | |
136 | |
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137 void add_reference(OopOrNarrowOopStar from) { |
342 | 138 add_reference_work(from, /*parallel*/ true); |
139 } | |
140 | |
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141 void seq_add_reference(OopOrNarrowOopStar from) { |
342 | 142 add_reference_work(from, /*parallel*/ false); |
143 } | |
144 | |
145 void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { | |
146 HeapWord* hr_bot = hr()->bottom(); | |
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147 size_t hr_first_card_index = ctbs->index_for(hr_bot); |
342 | 148 bm()->set_intersection_at_offset(*card_bm, hr_first_card_index); |
149 recount_occupied(); | |
150 } | |
151 | |
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152 void add_card(CardIdx_t from_card_index) { |
342 | 153 add_card_work(from_card_index, /*parallel*/ true); |
154 } | |
155 | |
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156 void seq_add_card(CardIdx_t from_card_index) { |
342 | 157 add_card_work(from_card_index, /*parallel*/ false); |
158 } | |
159 | |
160 // (Destructively) union the bitmap of the current table into the given | |
161 // bitmap (which is assumed to be of the same size.) | |
162 void union_bitmap_into(BitMap* bm) { | |
163 bm->set_union(_bm); | |
164 } | |
165 | |
166 // Mem size in bytes. | |
167 size_t mem_size() const { | |
168 return sizeof(this) + _bm.size_in_words() * HeapWordSize; | |
169 } | |
170 | |
171 // Requires "from" to be in "hr()". | |
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172 bool contains_reference(OopOrNarrowOopStar from) const { |
342 | 173 assert(hr()->is_in_reserved(from), "Precondition."); |
174 size_t card_ind = pointer_delta(from, hr()->bottom(), | |
175 CardTableModRefBS::card_size); | |
176 return _bm.at(card_ind); | |
177 } | |
178 | |
6253 | 179 // Bulk-free the PRTs from prt to last, assumes that they are |
180 // linked together using their _next field. | |
181 static void bulk_free(PerRegionTable* prt, PerRegionTable* last) { | |
342 | 182 while (true) { |
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183 PerRegionTable* fl = _free_list; |
6253 | 184 last->set_next(fl); |
185 PerRegionTable* res = (PerRegionTable*) Atomic::cmpxchg_ptr(prt, &_free_list, fl); | |
186 if (res == fl) { | |
187 return; | |
188 } | |
342 | 189 } |
190 ShouldNotReachHere(); | |
191 } | |
192 | |
6253 | 193 static void free(PerRegionTable* prt) { |
194 bulk_free(prt, prt); | |
195 } | |
196 | |
197 // Returns an initialized PerRegionTable instance. | |
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198 static PerRegionTable* alloc(HeapRegion* hr) { |
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199 PerRegionTable* fl = _free_list; |
342 | 200 while (fl != NULL) { |
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201 PerRegionTable* nxt = fl->next(); |
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202 PerRegionTable* res = |
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203 (PerRegionTable*) |
342 | 204 Atomic::cmpxchg_ptr(nxt, &_free_list, fl); |
205 if (res == fl) { | |
6253 | 206 fl->init(hr, true); |
342 | 207 return fl; |
208 } else { | |
209 fl = _free_list; | |
210 } | |
211 } | |
212 assert(fl == NULL, "Loop condition."); | |
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213 return new PerRegionTable(hr); |
342 | 214 } |
215 | |
6253 | 216 PerRegionTable* next() const { return _next; } |
217 void set_next(PerRegionTable* next) { _next = next; } | |
218 PerRegionTable* prev() const { return _prev; } | |
219 void set_prev(PerRegionTable* prev) { _prev = prev; } | |
220 | |
221 // Accessor and Modification routines for the pointer for the | |
222 // singly linked collision list that links the PRTs within the | |
223 // OtherRegionsTable::_fine_grain_regions hash table. | |
224 // | |
225 // It might be useful to also make the collision list doubly linked | |
226 // to avoid iteration over the collisions list during scrubbing/deletion. | |
227 // OTOH there might not be many collisions. | |
228 | |
229 PerRegionTable* collision_list_next() const { | |
230 return _collision_list_next; | |
231 } | |
232 | |
233 void set_collision_list_next(PerRegionTable* next) { | |
234 _collision_list_next = next; | |
235 } | |
236 | |
237 PerRegionTable** collision_list_next_addr() { | |
238 return &_collision_list_next; | |
239 } | |
240 | |
342 | 241 static size_t fl_mem_size() { |
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242 PerRegionTable* cur = _free_list; |
342 | 243 size_t res = 0; |
244 while (cur != NULL) { | |
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245 res += sizeof(PerRegionTable); |
342 | 246 cur = cur->next(); |
247 } | |
248 return res; | |
249 } | |
250 }; | |
251 | |
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252 PerRegionTable* PerRegionTable::_free_list = NULL; |
342 | 253 |
254 size_t OtherRegionsTable::_max_fine_entries = 0; | |
255 size_t OtherRegionsTable::_mod_max_fine_entries_mask = 0; | |
256 size_t OtherRegionsTable::_fine_eviction_stride = 0; | |
257 size_t OtherRegionsTable::_fine_eviction_sample_size = 0; | |
258 | |
259 OtherRegionsTable::OtherRegionsTable(HeapRegion* hr) : | |
260 _g1h(G1CollectedHeap::heap()), | |
261 _m(Mutex::leaf, "An OtherRegionsTable lock", true), | |
262 _hr(hr), | |
263 _coarse_map(G1CollectedHeap::heap()->max_regions(), | |
264 false /* in-resource-area */), | |
265 _fine_grain_regions(NULL), | |
6253 | 266 _first_all_fine_prts(NULL), _last_all_fine_prts(NULL), |
342 | 267 _n_fine_entries(0), _n_coarse_entries(0), |
268 _fine_eviction_start(0), | |
269 _sparse_table(hr) | |
270 { | |
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271 typedef PerRegionTable* PerRegionTablePtr; |
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272 |
342 | 273 if (_max_fine_entries == 0) { |
274 assert(_mod_max_fine_entries_mask == 0, "Both or none."); | |
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275 size_t max_entries_log = (size_t)log2_long((jlong)G1RSetRegionEntries); |
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276 _max_fine_entries = (size_t)1 << max_entries_log; |
342 | 277 _mod_max_fine_entries_mask = _max_fine_entries - 1; |
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278 |
342 | 279 assert(_fine_eviction_sample_size == 0 |
280 && _fine_eviction_stride == 0, "All init at same time."); | |
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281 _fine_eviction_sample_size = MAX2((size_t)4, max_entries_log); |
342 | 282 _fine_eviction_stride = _max_fine_entries / _fine_eviction_sample_size; |
283 } | |
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284 |
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285 _fine_grain_regions = NEW_C_HEAP_ARRAY3(PerRegionTablePtr, _max_fine_entries, |
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286 mtGC, 0, AllocFailStrategy::RETURN_NULL); |
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287 |
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288 if (_fine_grain_regions == NULL) { |
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289 vm_exit_out_of_memory(sizeof(void*)*_max_fine_entries, OOM_MALLOC_ERROR, |
342 | 290 "Failed to allocate _fine_grain_entries."); |
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291 } |
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292 |
342 | 293 for (size_t i = 0; i < _max_fine_entries; i++) { |
294 _fine_grain_regions[i] = NULL; | |
295 } | |
296 } | |
297 | |
6253 | 298 void OtherRegionsTable::link_to_all(PerRegionTable* prt) { |
299 // We always append to the beginning of the list for convenience; | |
300 // the order of entries in this list does not matter. | |
301 if (_first_all_fine_prts != NULL) { | |
302 assert(_first_all_fine_prts->prev() == NULL, "invariant"); | |
303 _first_all_fine_prts->set_prev(prt); | |
304 prt->set_next(_first_all_fine_prts); | |
305 } else { | |
306 // this is the first element we insert. Adjust the "last" pointer | |
307 _last_all_fine_prts = prt; | |
308 assert(prt->next() == NULL, "just checking"); | |
309 } | |
310 // the new element is always the first element without a predecessor | |
311 prt->set_prev(NULL); | |
312 _first_all_fine_prts = prt; | |
313 | |
314 assert(prt->prev() == NULL, "just checking"); | |
315 assert(_first_all_fine_prts == prt, "just checking"); | |
316 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || | |
317 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), | |
318 "just checking"); | |
319 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, | |
320 "just checking"); | |
321 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, | |
322 "just checking"); | |
323 } | |
324 | |
325 void OtherRegionsTable::unlink_from_all(PerRegionTable* prt) { | |
326 if (prt->prev() != NULL) { | |
327 assert(_first_all_fine_prts != prt, "just checking"); | |
328 prt->prev()->set_next(prt->next()); | |
329 // removing the last element in the list? | |
330 if (_last_all_fine_prts == prt) { | |
331 _last_all_fine_prts = prt->prev(); | |
332 } | |
333 } else { | |
334 assert(_first_all_fine_prts == prt, "just checking"); | |
335 _first_all_fine_prts = prt->next(); | |
336 // list is empty now? | |
337 if (_first_all_fine_prts == NULL) { | |
338 _last_all_fine_prts = NULL; | |
339 } | |
340 } | |
341 | |
342 if (prt->next() != NULL) { | |
343 prt->next()->set_prev(prt->prev()); | |
344 } | |
345 | |
346 prt->set_next(NULL); | |
347 prt->set_prev(NULL); | |
348 | |
349 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || | |
350 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), | |
351 "just checking"); | |
352 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, | |
353 "just checking"); | |
354 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, | |
355 "just checking"); | |
356 } | |
357 | |
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358 int** OtherRegionsTable::_from_card_cache = NULL; |
342 | 359 size_t OtherRegionsTable::_from_card_cache_max_regions = 0; |
360 size_t OtherRegionsTable::_from_card_cache_mem_size = 0; | |
361 | |
362 void OtherRegionsTable::init_from_card_cache(size_t max_regions) { | |
363 _from_card_cache_max_regions = max_regions; | |
364 | |
365 int n_par_rs = HeapRegionRemSet::num_par_rem_sets(); | |
6197 | 366 _from_card_cache = NEW_C_HEAP_ARRAY(int*, n_par_rs, mtGC); |
342 | 367 for (int i = 0; i < n_par_rs; i++) { |
6197 | 368 _from_card_cache[i] = NEW_C_HEAP_ARRAY(int, max_regions, mtGC); |
342 | 369 for (size_t j = 0; j < max_regions; j++) { |
370 _from_card_cache[i][j] = -1; // An invalid value. | |
371 } | |
372 } | |
373 _from_card_cache_mem_size = n_par_rs * max_regions * sizeof(int); | |
374 } | |
375 | |
376 void OtherRegionsTable::shrink_from_card_cache(size_t new_n_regs) { | |
377 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
378 assert(new_n_regs <= _from_card_cache_max_regions, "Must be within max."); | |
379 for (size_t j = new_n_regs; j < _from_card_cache_max_regions; j++) { | |
380 _from_card_cache[i][j] = -1; // An invalid value. | |
381 } | |
382 } | |
383 } | |
384 | |
385 #ifndef PRODUCT | |
386 void OtherRegionsTable::print_from_card_cache() { | |
387 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
388 for (size_t j = 0; j < _from_card_cache_max_regions; j++) { | |
389 gclog_or_tty->print_cr("_from_card_cache[%d][%d] = %d.", | |
390 i, j, _from_card_cache[i][j]); | |
391 } | |
392 } | |
393 } | |
394 #endif | |
395 | |
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396 void OtherRegionsTable::add_reference(OopOrNarrowOopStar from, int tid) { |
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397 size_t cur_hrs_ind = (size_t) hr()->hrs_index(); |
342 | 398 |
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399 if (G1TraceHeapRegionRememberedSet) { |
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400 gclog_or_tty->print_cr("ORT::add_reference_work(" PTR_FORMAT "->" PTR_FORMAT ").", |
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401 from, |
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402 UseCompressedOops |
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403 ? oopDesc::load_decode_heap_oop((narrowOop*)from) |
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404 : oopDesc::load_decode_heap_oop((oop*)from)); |
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405 } |
342 | 406 |
407 int from_card = (int)(uintptr_t(from) >> CardTableModRefBS::card_shift); | |
408 | |
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409 if (G1TraceHeapRegionRememberedSet) { |
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410 gclog_or_tty->print_cr("Table for [" PTR_FORMAT "...): card %d (cache = %d)", |
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411 hr()->bottom(), from_card, |
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412 _from_card_cache[tid][cur_hrs_ind]); |
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413 } |
342 | 414 |
415 if (from_card == _from_card_cache[tid][cur_hrs_ind]) { | |
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416 if (G1TraceHeapRegionRememberedSet) { |
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417 gclog_or_tty->print_cr(" from-card cache hit."); |
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418 } |
342 | 419 assert(contains_reference(from), "We just added it!"); |
420 return; | |
421 } else { | |
422 _from_card_cache[tid][cur_hrs_ind] = from_card; | |
423 } | |
424 | |
425 // Note that this may be a continued H region. | |
426 HeapRegion* from_hr = _g1h->heap_region_containing_raw(from); | |
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427 RegionIdx_t from_hrs_ind = (RegionIdx_t) from_hr->hrs_index(); |
342 | 428 |
429 // If the region is already coarsened, return. | |
430 if (_coarse_map.at(from_hrs_ind)) { | |
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431 if (G1TraceHeapRegionRememberedSet) { |
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432 gclog_or_tty->print_cr(" coarse map hit."); |
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433 } |
342 | 434 assert(contains_reference(from), "We just added it!"); |
435 return; | |
436 } | |
437 | |
438 // Otherwise find a per-region table to add it to. | |
439 size_t ind = from_hrs_ind & _mod_max_fine_entries_mask; | |
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440 PerRegionTable* prt = find_region_table(ind, from_hr); |
342 | 441 if (prt == NULL) { |
442 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
443 // Confirm that it's really not there... | |
444 prt = find_region_table(ind, from_hr); | |
445 if (prt == NULL) { | |
446 | |
447 uintptr_t from_hr_bot_card_index = | |
448 uintptr_t(from_hr->bottom()) | |
449 >> CardTableModRefBS::card_shift; | |
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450 CardIdx_t card_index = from_card - from_hr_bot_card_index; |
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451 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
342 | 452 "Must be in range."); |
453 if (G1HRRSUseSparseTable && | |
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454 _sparse_table.add_card(from_hrs_ind, card_index)) { |
342 | 455 if (G1RecordHRRSOops) { |
456 HeapRegionRemSet::record(hr(), from); | |
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457 if (G1TraceHeapRegionRememberedSet) { |
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458 gclog_or_tty->print(" Added card " PTR_FORMAT " to region " |
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459 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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460 align_size_down(uintptr_t(from), |
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461 CardTableModRefBS::card_size), |
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462 hr()->bottom(), from); |
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463 } |
342 | 464 } |
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465 if (G1TraceHeapRegionRememberedSet) { |
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466 gclog_or_tty->print_cr(" added card to sparse table."); |
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467 } |
342 | 468 assert(contains_reference_locked(from), "We just added it!"); |
469 return; | |
470 } else { | |
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471 if (G1TraceHeapRegionRememberedSet) { |
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472 gclog_or_tty->print_cr(" [tid %d] sparse table entry " |
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473 "overflow(f: %d, t: %d)", |
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474 tid, from_hrs_ind, cur_hrs_ind); |
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475 } |
342 | 476 } |
477 | |
478 if (_n_fine_entries == _max_fine_entries) { | |
479 prt = delete_region_table(); | |
6253 | 480 // There is no need to clear the links to the 'all' list here: |
481 // prt will be reused immediately, i.e. remain in the 'all' list. | |
482 prt->init(from_hr, false /* clear_links_to_all_list */); | |
342 | 483 } else { |
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484 prt = PerRegionTable::alloc(from_hr); |
6253 | 485 link_to_all(prt); |
342 | 486 } |
487 | |
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488 PerRegionTable* first_prt = _fine_grain_regions[ind]; |
6253 | 489 prt->set_collision_list_next(first_prt); |
342 | 490 _fine_grain_regions[ind] = prt; |
491 _n_fine_entries++; | |
492 | |
493 if (G1HRRSUseSparseTable) { | |
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494 // Transfer from sparse to fine-grain. |
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495 SparsePRTEntry *sprt_entry = _sparse_table.get_entry(from_hrs_ind); |
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496 assert(sprt_entry != NULL, "There should have been an entry"); |
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497 for (int i = 0; i < SparsePRTEntry::cards_num(); i++) { |
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498 CardIdx_t c = sprt_entry->card(i); |
342 | 499 if (c != SparsePRTEntry::NullEntry) { |
500 prt->add_card(c); | |
501 } | |
502 } | |
503 // Now we can delete the sparse entry. | |
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504 bool res = _sparse_table.delete_entry(from_hrs_ind); |
342 | 505 assert(res, "It should have been there."); |
506 } | |
507 } | |
508 assert(prt != NULL && prt->hr() == from_hr, "consequence"); | |
509 } | |
510 // Note that we can't assert "prt->hr() == from_hr", because of the | |
511 // possibility of concurrent reuse. But see head comment of | |
512 // OtherRegionsTable for why this is OK. | |
513 assert(prt != NULL, "Inv"); | |
514 | |
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515 prt->add_reference(from); |
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516 |
342 | 517 if (G1RecordHRRSOops) { |
518 HeapRegionRemSet::record(hr(), from); | |
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519 if (G1TraceHeapRegionRememberedSet) { |
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520 gclog_or_tty->print("Added card " PTR_FORMAT " to region " |
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521 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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522 align_size_down(uintptr_t(from), |
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523 CardTableModRefBS::card_size), |
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524 hr()->bottom(), from); |
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525 } |
342 | 526 } |
527 assert(contains_reference(from), "We just added it!"); | |
528 } | |
529 | |
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530 PerRegionTable* |
342 | 531 OtherRegionsTable::find_region_table(size_t ind, HeapRegion* hr) const { |
532 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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533 PerRegionTable* prt = _fine_grain_regions[ind]; |
342 | 534 while (prt != NULL && prt->hr() != hr) { |
6253 | 535 prt = prt->collision_list_next(); |
342 | 536 } |
537 // Loop postcondition is the method postcondition. | |
538 return prt; | |
539 } | |
540 | |
541 jint OtherRegionsTable::_n_coarsenings = 0; | |
542 | |
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543 PerRegionTable* OtherRegionsTable::delete_region_table() { |
342 | 544 assert(_m.owned_by_self(), "Precondition"); |
545 assert(_n_fine_entries == _max_fine_entries, "Precondition"); | |
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546 PerRegionTable* max = NULL; |
342 | 547 jint max_occ = 0; |
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548 PerRegionTable** max_prev; |
342 | 549 size_t max_ind; |
550 | |
551 size_t i = _fine_eviction_start; | |
552 for (size_t k = 0; k < _fine_eviction_sample_size; k++) { | |
553 size_t ii = i; | |
554 // Make sure we get a non-NULL sample. | |
555 while (_fine_grain_regions[ii] == NULL) { | |
556 ii++; | |
557 if (ii == _max_fine_entries) ii = 0; | |
558 guarantee(ii != i, "We must find one."); | |
559 } | |
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560 PerRegionTable** prev = &_fine_grain_regions[ii]; |
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561 PerRegionTable* cur = *prev; |
342 | 562 while (cur != NULL) { |
563 jint cur_occ = cur->occupied(); | |
564 if (max == NULL || cur_occ > max_occ) { | |
565 max = cur; | |
566 max_prev = prev; | |
567 max_ind = i; | |
568 max_occ = cur_occ; | |
569 } | |
6253 | 570 prev = cur->collision_list_next_addr(); |
571 cur = cur->collision_list_next(); | |
342 | 572 } |
573 i = i + _fine_eviction_stride; | |
574 if (i >= _n_fine_entries) i = i - _n_fine_entries; | |
575 } | |
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576 |
342 | 577 _fine_eviction_start++; |
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578 |
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579 if (_fine_eviction_start >= _n_fine_entries) { |
342 | 580 _fine_eviction_start -= _n_fine_entries; |
581 } | |
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582 |
342 | 583 guarantee(max != NULL, "Since _n_fine_entries > 0"); |
584 | |
585 // Set the corresponding coarse bit. | |
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586 size_t max_hrs_index = (size_t) max->hr()->hrs_index(); |
342 | 587 if (!_coarse_map.at(max_hrs_index)) { |
588 _coarse_map.at_put(max_hrs_index, true); | |
589 _n_coarse_entries++; | |
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590 if (G1TraceHeapRegionRememberedSet) { |
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591 gclog_or_tty->print("Coarsened entry in region [" PTR_FORMAT "...] " |
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592 "for region [" PTR_FORMAT "...] (%d coarse entries).\n", |
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593 hr()->bottom(), |
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594 max->hr()->bottom(), |
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595 _n_coarse_entries); |
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596 } |
342 | 597 } |
598 | |
599 // Unsplice. | |
6253 | 600 *max_prev = max->collision_list_next(); |
342 | 601 Atomic::inc(&_n_coarsenings); |
602 _n_fine_entries--; | |
603 return max; | |
604 } | |
605 | |
606 | |
607 // At present, this must be called stop-world single-threaded. | |
608 void OtherRegionsTable::scrub(CardTableModRefBS* ctbs, | |
609 BitMap* region_bm, BitMap* card_bm) { | |
610 // First eliminated garbage regions from the coarse map. | |
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611 if (G1RSScrubVerbose) { |
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612 gclog_or_tty->print_cr("Scrubbing region %u:", hr()->hrs_index()); |
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613 } |
342 | 614 |
615 assert(_coarse_map.size() == region_bm->size(), "Precondition"); | |
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616 if (G1RSScrubVerbose) { |
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617 gclog_or_tty->print(" Coarse map: before = "SIZE_FORMAT"...", |
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618 _n_coarse_entries); |
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619 } |
342 | 620 _coarse_map.set_intersection(*region_bm); |
621 _n_coarse_entries = _coarse_map.count_one_bits(); | |
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622 if (G1RSScrubVerbose) { |
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623 gclog_or_tty->print_cr(" after = "SIZE_FORMAT".", _n_coarse_entries); |
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624 } |
342 | 625 |
626 // Now do the fine-grained maps. | |
627 for (size_t i = 0; i < _max_fine_entries; i++) { | |
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628 PerRegionTable* cur = _fine_grain_regions[i]; |
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629 PerRegionTable** prev = &_fine_grain_regions[i]; |
342 | 630 while (cur != NULL) { |
6253 | 631 PerRegionTable* nxt = cur->collision_list_next(); |
342 | 632 // If the entire region is dead, eliminate. |
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633 if (G1RSScrubVerbose) { |
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634 gclog_or_tty->print_cr(" For other region %u:", |
3766 | 635 cur->hr()->hrs_index()); |
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636 } |
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637 if (!region_bm->at((size_t) cur->hr()->hrs_index())) { |
342 | 638 *prev = nxt; |
6253 | 639 cur->set_collision_list_next(NULL); |
342 | 640 _n_fine_entries--; |
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641 if (G1RSScrubVerbose) { |
342 | 642 gclog_or_tty->print_cr(" deleted via region map."); |
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643 } |
6253 | 644 unlink_from_all(cur); |
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645 PerRegionTable::free(cur); |
342 | 646 } else { |
647 // Do fine-grain elimination. | |
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648 if (G1RSScrubVerbose) { |
342 | 649 gclog_or_tty->print(" occ: before = %4d.", cur->occupied()); |
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650 } |
342 | 651 cur->scrub(ctbs, card_bm); |
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652 if (G1RSScrubVerbose) { |
342 | 653 gclog_or_tty->print_cr(" after = %4d.", cur->occupied()); |
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654 } |
342 | 655 // Did that empty the table completely? |
656 if (cur->occupied() == 0) { | |
657 *prev = nxt; | |
6253 | 658 cur->set_collision_list_next(NULL); |
342 | 659 _n_fine_entries--; |
6253 | 660 unlink_from_all(cur); |
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661 PerRegionTable::free(cur); |
342 | 662 } else { |
6253 | 663 prev = cur->collision_list_next_addr(); |
342 | 664 } |
665 } | |
666 cur = nxt; | |
667 } | |
668 } | |
669 // Since we may have deleted a from_card_cache entry from the RS, clear | |
670 // the FCC. | |
671 clear_fcc(); | |
672 } | |
673 | |
674 | |
675 size_t OtherRegionsTable::occupied() const { | |
676 // Cast away const in this case. | |
677 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
678 size_t sum = occ_fine(); | |
679 sum += occ_sparse(); | |
680 sum += occ_coarse(); | |
681 return sum; | |
682 } | |
683 | |
684 size_t OtherRegionsTable::occ_fine() const { | |
685 size_t sum = 0; | |
6253 | 686 |
687 size_t num = 0; | |
688 PerRegionTable * cur = _first_all_fine_prts; | |
689 while (cur != NULL) { | |
690 sum += cur->occupied(); | |
691 cur = cur->next(); | |
692 num++; | |
342 | 693 } |
6253 | 694 guarantee(num == _n_fine_entries, "just checking"); |
342 | 695 return sum; |
696 } | |
697 | |
698 size_t OtherRegionsTable::occ_coarse() const { | |
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699 return (_n_coarse_entries * HeapRegion::CardsPerRegion); |
342 | 700 } |
701 | |
702 size_t OtherRegionsTable::occ_sparse() const { | |
703 return _sparse_table.occupied(); | |
704 } | |
705 | |
706 size_t OtherRegionsTable::mem_size() const { | |
707 // Cast away const in this case. | |
708 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
709 size_t sum = 0; | |
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710 // all PRTs are of the same size so it is sufficient to query only one of them. |
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711 if (_first_all_fine_prts != NULL) { |
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712 assert(_last_all_fine_prts != NULL && |
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713 _first_all_fine_prts->mem_size() == _last_all_fine_prts->mem_size(), "check that mem_size() is constant"); |
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714 sum += _first_all_fine_prts->mem_size() * _n_fine_entries; |
342 | 715 } |
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716 sum += (sizeof(PerRegionTable*) * _max_fine_entries); |
342 | 717 sum += (_coarse_map.size_in_words() * HeapWordSize); |
718 sum += (_sparse_table.mem_size()); | |
719 sum += sizeof(*this) - sizeof(_sparse_table); // Avoid double counting above. | |
720 return sum; | |
721 } | |
722 | |
723 size_t OtherRegionsTable::static_mem_size() { | |
724 return _from_card_cache_mem_size; | |
725 } | |
726 | |
727 size_t OtherRegionsTable::fl_mem_size() { | |
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728 return PerRegionTable::fl_mem_size(); |
342 | 729 } |
730 | |
731 void OtherRegionsTable::clear_fcc() { | |
6253 | 732 size_t hrs_idx = hr()->hrs_index(); |
342 | 733 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { |
6253 | 734 _from_card_cache[i][hrs_idx] = -1; |
342 | 735 } |
736 } | |
737 | |
738 void OtherRegionsTable::clear() { | |
739 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
6253 | 740 // if there are no entries, skip this step |
741 if (_first_all_fine_prts != NULL) { | |
742 guarantee(_first_all_fine_prts != NULL && _last_all_fine_prts != NULL, "just checking"); | |
743 PerRegionTable::bulk_free(_first_all_fine_prts, _last_all_fine_prts); | |
744 memset(_fine_grain_regions, 0, _max_fine_entries * sizeof(_fine_grain_regions[0])); | |
745 } else { | |
746 guarantee(_first_all_fine_prts == NULL && _last_all_fine_prts == NULL, "just checking"); | |
342 | 747 } |
6253 | 748 |
749 _first_all_fine_prts = _last_all_fine_prts = NULL; | |
342 | 750 _sparse_table.clear(); |
751 _coarse_map.clear(); | |
752 _n_fine_entries = 0; | |
753 _n_coarse_entries = 0; | |
754 | |
755 clear_fcc(); | |
756 } | |
757 | |
758 void OtherRegionsTable::clear_incoming_entry(HeapRegion* from_hr) { | |
759 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
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760 size_t hrs_ind = (size_t) from_hr->hrs_index(); |
342 | 761 size_t ind = hrs_ind & _mod_max_fine_entries_mask; |
762 if (del_single_region_table(ind, from_hr)) { | |
763 assert(!_coarse_map.at(hrs_ind), "Inv"); | |
764 } else { | |
765 _coarse_map.par_at_put(hrs_ind, 0); | |
766 } | |
767 // Check to see if any of the fcc entries come from here. | |
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768 size_t hr_ind = (size_t) hr()->hrs_index(); |
342 | 769 for (int tid = 0; tid < HeapRegionRemSet::num_par_rem_sets(); tid++) { |
770 int fcc_ent = _from_card_cache[tid][hr_ind]; | |
771 if (fcc_ent != -1) { | |
772 HeapWord* card_addr = (HeapWord*) | |
773 (uintptr_t(fcc_ent) << CardTableModRefBS::card_shift); | |
774 if (hr()->is_in_reserved(card_addr)) { | |
775 // Clear the from card cache. | |
776 _from_card_cache[tid][hr_ind] = -1; | |
777 } | |
778 } | |
779 } | |
780 } | |
781 | |
782 bool OtherRegionsTable::del_single_region_table(size_t ind, | |
783 HeapRegion* hr) { | |
784 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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785 PerRegionTable** prev_addr = &_fine_grain_regions[ind]; |
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786 PerRegionTable* prt = *prev_addr; |
342 | 787 while (prt != NULL && prt->hr() != hr) { |
6253 | 788 prev_addr = prt->collision_list_next_addr(); |
789 prt = prt->collision_list_next(); | |
342 | 790 } |
791 if (prt != NULL) { | |
792 assert(prt->hr() == hr, "Loop postcondition."); | |
6253 | 793 *prev_addr = prt->collision_list_next(); |
794 unlink_from_all(prt); | |
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795 PerRegionTable::free(prt); |
342 | 796 _n_fine_entries--; |
797 return true; | |
798 } else { | |
799 return false; | |
800 } | |
801 } | |
802 | |
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803 bool OtherRegionsTable::contains_reference(OopOrNarrowOopStar from) const { |
342 | 804 // Cast away const in this case. |
805 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
806 return contains_reference_locked(from); | |
807 } | |
808 | |
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809 bool OtherRegionsTable::contains_reference_locked(OopOrNarrowOopStar from) const { |
342 | 810 HeapRegion* hr = _g1h->heap_region_containing_raw(from); |
811 if (hr == NULL) return false; | |
807
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812 RegionIdx_t hr_ind = (RegionIdx_t) hr->hrs_index(); |
342 | 813 // Is this region in the coarse map? |
814 if (_coarse_map.at(hr_ind)) return true; | |
815 | |
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816 PerRegionTable* prt = find_region_table(hr_ind & _mod_max_fine_entries_mask, |
342 | 817 hr); |
818 if (prt != NULL) { | |
819 return prt->contains_reference(from); | |
820 | |
821 } else { | |
822 uintptr_t from_card = | |
823 (uintptr_t(from) >> CardTableModRefBS::card_shift); | |
824 uintptr_t hr_bot_card_index = | |
825 uintptr_t(hr->bottom()) >> CardTableModRefBS::card_shift; | |
826 assert(from_card >= hr_bot_card_index, "Inv"); | |
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827 CardIdx_t card_index = from_card - hr_bot_card_index; |
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828 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
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829 "Must be in range."); |
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830 return _sparse_table.contains_card(hr_ind, card_index); |
342 | 831 } |
832 | |
833 | |
834 } | |
835 | |
2173 | 836 void |
837 OtherRegionsTable::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
838 _sparse_table.do_cleanup_work(hrrs_cleanup_task); | |
839 } | |
840 | |
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841 // Determines how many threads can add records to an rset in parallel. |
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842 // This can be done by either mutator threads together with the |
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843 // concurrent refinement threads or GC threads. |
342 | 844 int HeapRegionRemSet::num_par_rem_sets() { |
795
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845 return (int)MAX2(DirtyCardQueueSet::num_par_ids() + ConcurrentG1Refine::thread_num(), ParallelGCThreads); |
342 | 846 } |
847 | |
848 HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, | |
849 HeapRegion* hr) | |
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850 : _bosa(bosa), _other_regions(hr) { |
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851 reset_for_par_iteration(); |
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852 } |
342 | 853 |
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854 void HeapRegionRemSet::setup_remset_size() { |
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855 // Setup sparse and fine-grain tables sizes. |
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856 // table_size = base * (log(region_size / 1M) + 1) |
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857 const int LOG_M = 20; |
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858 int region_size_log_mb = MAX2(HeapRegion::LogOfHRGrainBytes - LOG_M, 0); |
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859 if (FLAG_IS_DEFAULT(G1RSetSparseRegionEntries)) { |
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860 G1RSetSparseRegionEntries = G1RSetSparseRegionEntriesBase * (region_size_log_mb + 1); |
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861 } |
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862 if (FLAG_IS_DEFAULT(G1RSetRegionEntries)) { |
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863 G1RSetRegionEntries = G1RSetRegionEntriesBase * (region_size_log_mb + 1); |
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864 } |
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865 guarantee(G1RSetSparseRegionEntries > 0 && G1RSetRegionEntries > 0 , "Sanity"); |
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866 } |
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867 |
342 | 868 bool HeapRegionRemSet::claim_iter() { |
869 if (_iter_state != Unclaimed) return false; | |
870 jint res = Atomic::cmpxchg(Claimed, (jint*)(&_iter_state), Unclaimed); | |
871 return (res == Unclaimed); | |
872 } | |
873 | |
874 void HeapRegionRemSet::set_iter_complete() { | |
875 _iter_state = Complete; | |
876 } | |
877 | |
878 bool HeapRegionRemSet::iter_is_complete() { | |
879 return _iter_state == Complete; | |
880 } | |
881 | |
882 #ifndef PRODUCT | |
883 void HeapRegionRemSet::print() const { | |
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884 HeapRegionRemSetIterator iter(this); |
342 | 885 size_t card_index; |
886 while (iter.has_next(card_index)) { | |
887 HeapWord* card_start = | |
888 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
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889 gclog_or_tty->print_cr(" Card " PTR_FORMAT, card_start); |
342 | 890 } |
891 if (iter.n_yielded() != occupied()) { | |
892 gclog_or_tty->print_cr("Yielded disagrees with occupied:"); | |
893 gclog_or_tty->print_cr(" %6d yielded (%6d coarse, %6d fine).", | |
894 iter.n_yielded(), | |
895 iter.n_yielded_coarse(), iter.n_yielded_fine()); | |
896 gclog_or_tty->print_cr(" %6d occ (%6d coarse, %6d fine).", | |
897 occupied(), occ_coarse(), occ_fine()); | |
898 } | |
899 guarantee(iter.n_yielded() == occupied(), | |
900 "We should have yielded all the represented cards."); | |
901 } | |
902 #endif | |
903 | |
904 void HeapRegionRemSet::cleanup() { | |
905 SparsePRT::cleanup_all(); | |
906 } | |
907 | |
908 void HeapRegionRemSet::clear() { | |
909 _other_regions.clear(); | |
910 assert(occupied() == 0, "Should be clear."); | |
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911 reset_for_par_iteration(); |
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912 } |
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913 |
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914 void HeapRegionRemSet::reset_for_par_iteration() { |
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915 _iter_state = Unclaimed; |
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916 _iter_claimed = 0; |
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917 // It's good to check this to make sure that the two methods are in sync. |
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918 assert(verify_ready_for_par_iteration(), "post-condition"); |
342 | 919 } |
920 | |
921 void HeapRegionRemSet::scrub(CardTableModRefBS* ctbs, | |
922 BitMap* region_bm, BitMap* card_bm) { | |
923 _other_regions.scrub(ctbs, region_bm, card_bm); | |
924 } | |
925 | |
926 //-------------------- Iteration -------------------- | |
927 | |
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928 HeapRegionRemSetIterator:: HeapRegionRemSetIterator(const HeapRegionRemSet* hrrs) : |
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929 _hrrs(hrrs), |
342 | 930 _g1h(G1CollectedHeap::heap()), |
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931 _coarse_map(&hrrs->_other_regions._coarse_map), |
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932 _fine_grain_regions(hrrs->_other_regions._fine_grain_regions), |
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933 _bosa(hrrs->bosa()), |
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934 _is(Sparse), |
342 | 935 // Set these values so that we increment to the first region. |
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936 _coarse_cur_region_index(-1), |
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937 _coarse_cur_region_cur_card(HeapRegion::CardsPerRegion-1), |
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938 _cur_region_cur_card(0), |
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939 _fine_array_index(-1), |
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940 _fine_cur_prt(NULL), |
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941 _n_yielded_coarse(0), |
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942 _n_yielded_fine(0), |
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943 _n_yielded_sparse(0), |
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944 _sparse_iter(&hrrs->_other_regions._sparse_table) {} |
342 | 945 |
946 bool HeapRegionRemSetIterator::coarse_has_next(size_t& card_index) { | |
947 if (_hrrs->_other_regions._n_coarse_entries == 0) return false; | |
948 // Go to the next card. | |
949 _coarse_cur_region_cur_card++; | |
950 // Was the last the last card in the current region? | |
942
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951 if (_coarse_cur_region_cur_card == HeapRegion::CardsPerRegion) { |
342 | 952 // Yes: find the next region. This may leave _coarse_cur_region_index |
953 // Set to the last index, in which case there are no more coarse | |
954 // regions. | |
955 _coarse_cur_region_index = | |
956 (int) _coarse_map->get_next_one_offset(_coarse_cur_region_index + 1); | |
957 if ((size_t)_coarse_cur_region_index < _coarse_map->size()) { | |
958 _coarse_cur_region_cur_card = 0; | |
959 HeapWord* r_bot = | |
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960 _g1h->region_at((uint) _coarse_cur_region_index)->bottom(); |
342 | 961 _cur_region_card_offset = _bosa->index_for(r_bot); |
962 } else { | |
963 return false; | |
964 } | |
965 } | |
966 // If we didn't return false above, then we can yield a card. | |
967 card_index = _cur_region_card_offset + _coarse_cur_region_cur_card; | |
968 return true; | |
969 } | |
970 | |
971 void HeapRegionRemSetIterator::fine_find_next_non_null_prt() { | |
972 // Otherwise, find the next bucket list in the array. | |
973 _fine_array_index++; | |
974 while (_fine_array_index < (int) OtherRegionsTable::_max_fine_entries) { | |
975 _fine_cur_prt = _fine_grain_regions[_fine_array_index]; | |
976 if (_fine_cur_prt != NULL) return; | |
977 else _fine_array_index++; | |
978 } | |
979 assert(_fine_cur_prt == NULL, "Loop post"); | |
980 } | |
981 | |
982 bool HeapRegionRemSetIterator::fine_has_next(size_t& card_index) { | |
983 if (fine_has_next()) { | |
984 _cur_region_cur_card = | |
985 _fine_cur_prt->_bm.get_next_one_offset(_cur_region_cur_card + 1); | |
986 } | |
987 while (!fine_has_next()) { | |
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988 if (_cur_region_cur_card == (size_t) HeapRegion::CardsPerRegion) { |
342 | 989 _cur_region_cur_card = 0; |
6253 | 990 _fine_cur_prt = _fine_cur_prt->collision_list_next(); |
342 | 991 } |
992 if (_fine_cur_prt == NULL) { | |
993 fine_find_next_non_null_prt(); | |
994 if (_fine_cur_prt == NULL) return false; | |
995 } | |
996 assert(_fine_cur_prt != NULL && _cur_region_cur_card == 0, | |
997 "inv."); | |
998 HeapWord* r_bot = | |
999 _fine_cur_prt->hr()->bottom(); | |
1000 _cur_region_card_offset = _bosa->index_for(r_bot); | |
1001 _cur_region_cur_card = _fine_cur_prt->_bm.get_next_one_offset(0); | |
1002 } | |
1003 assert(fine_has_next(), "Or else we exited the loop via the return."); | |
1004 card_index = _cur_region_card_offset + _cur_region_cur_card; | |
1005 return true; | |
1006 } | |
1007 | |
1008 bool HeapRegionRemSetIterator::fine_has_next() { | |
1009 return | |
1010 _fine_cur_prt != NULL && | |
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1011 _cur_region_cur_card < HeapRegion::CardsPerRegion; |
342 | 1012 } |
1013 | |
1014 bool HeapRegionRemSetIterator::has_next(size_t& card_index) { | |
1015 switch (_is) { | |
1016 case Sparse: | |
1017 if (_sparse_iter.has_next(card_index)) { | |
1018 _n_yielded_sparse++; | |
1019 return true; | |
1020 } | |
1021 // Otherwise, deliberate fall-through | |
1022 _is = Fine; | |
1023 case Fine: | |
1024 if (fine_has_next(card_index)) { | |
1025 _n_yielded_fine++; | |
1026 return true; | |
1027 } | |
1028 // Otherwise, deliberate fall-through | |
1029 _is = Coarse; | |
1030 case Coarse: | |
1031 if (coarse_has_next(card_index)) { | |
1032 _n_yielded_coarse++; | |
1033 return true; | |
1034 } | |
1035 // Otherwise... | |
1036 break; | |
1037 } | |
1038 assert(ParallelGCThreads > 1 || | |
1039 n_yielded() == _hrrs->occupied(), | |
1040 "Should have yielded all the cards in the rem set " | |
1041 "(in the non-par case)."); | |
1042 return false; | |
1043 } | |
1044 | |
1045 | |
1046 | |
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1047 OopOrNarrowOopStar* HeapRegionRemSet::_recorded_oops = NULL; |
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1048 HeapWord** HeapRegionRemSet::_recorded_cards = NULL; |
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1049 HeapRegion** HeapRegionRemSet::_recorded_regions = NULL; |
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1050 int HeapRegionRemSet::_n_recorded = 0; |
342 | 1051 |
1052 HeapRegionRemSet::Event* HeapRegionRemSet::_recorded_events = NULL; | |
1053 int* HeapRegionRemSet::_recorded_event_index = NULL; | |
1054 int HeapRegionRemSet::_n_recorded_events = 0; | |
1055 | |
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1056 void HeapRegionRemSet::record(HeapRegion* hr, OopOrNarrowOopStar f) { |
342 | 1057 if (_recorded_oops == NULL) { |
1058 assert(_n_recorded == 0 | |
1059 && _recorded_cards == NULL | |
1060 && _recorded_regions == NULL, | |
1061 "Inv"); | |
6197 | 1062 _recorded_oops = NEW_C_HEAP_ARRAY(OopOrNarrowOopStar, MaxRecorded, mtGC); |
1063 _recorded_cards = NEW_C_HEAP_ARRAY(HeapWord*, MaxRecorded, mtGC); | |
1064 _recorded_regions = NEW_C_HEAP_ARRAY(HeapRegion*, MaxRecorded, mtGC); | |
342 | 1065 } |
1066 if (_n_recorded == MaxRecorded) { | |
1067 gclog_or_tty->print_cr("Filled up 'recorded' (%d).", MaxRecorded); | |
1068 } else { | |
1069 _recorded_cards[_n_recorded] = | |
1070 (HeapWord*)align_size_down(uintptr_t(f), | |
1071 CardTableModRefBS::card_size); | |
1072 _recorded_oops[_n_recorded] = f; | |
1073 _recorded_regions[_n_recorded] = hr; | |
1074 _n_recorded++; | |
1075 } | |
1076 } | |
1077 | |
1078 void HeapRegionRemSet::record_event(Event evnt) { | |
1079 if (!G1RecordHRRSEvents) return; | |
1080 | |
1081 if (_recorded_events == NULL) { | |
1082 assert(_n_recorded_events == 0 | |
1083 && _recorded_event_index == NULL, | |
1084 "Inv"); | |
6197 | 1085 _recorded_events = NEW_C_HEAP_ARRAY(Event, MaxRecordedEvents, mtGC); |
1086 _recorded_event_index = NEW_C_HEAP_ARRAY(int, MaxRecordedEvents, mtGC); | |
342 | 1087 } |
1088 if (_n_recorded_events == MaxRecordedEvents) { | |
1089 gclog_or_tty->print_cr("Filled up 'recorded_events' (%d).", MaxRecordedEvents); | |
1090 } else { | |
1091 _recorded_events[_n_recorded_events] = evnt; | |
1092 _recorded_event_index[_n_recorded_events] = _n_recorded; | |
1093 _n_recorded_events++; | |
1094 } | |
1095 } | |
1096 | |
1097 void HeapRegionRemSet::print_event(outputStream* str, Event evnt) { | |
1098 switch (evnt) { | |
1099 case Event_EvacStart: | |
1100 str->print("Evac Start"); | |
1101 break; | |
1102 case Event_EvacEnd: | |
1103 str->print("Evac End"); | |
1104 break; | |
1105 case Event_RSUpdateEnd: | |
1106 str->print("RS Update End"); | |
1107 break; | |
1108 } | |
1109 } | |
1110 | |
1111 void HeapRegionRemSet::print_recorded() { | |
1112 int cur_evnt = 0; | |
1113 Event cur_evnt_kind; | |
1114 int cur_evnt_ind = 0; | |
1115 if (_n_recorded_events > 0) { | |
1116 cur_evnt_kind = _recorded_events[cur_evnt]; | |
1117 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
1118 } | |
1119 | |
1120 for (int i = 0; i < _n_recorded; i++) { | |
1121 while (cur_evnt < _n_recorded_events && i == cur_evnt_ind) { | |
1122 gclog_or_tty->print("Event: "); | |
1123 print_event(gclog_or_tty, cur_evnt_kind); | |
1124 gclog_or_tty->print_cr(""); | |
1125 cur_evnt++; | |
1126 if (cur_evnt < MaxRecordedEvents) { | |
1127 cur_evnt_kind = _recorded_events[cur_evnt]; | |
1128 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
1129 } | |
1130 } | |
1131 gclog_or_tty->print("Added card " PTR_FORMAT " to region [" PTR_FORMAT "...]" | |
1132 " for ref " PTR_FORMAT ".\n", | |
1133 _recorded_cards[i], _recorded_regions[i]->bottom(), | |
1134 _recorded_oops[i]); | |
1135 } | |
1136 } | |
1137 | |
2173 | 1138 void HeapRegionRemSet::reset_for_cleanup_tasks() { |
1139 SparsePRT::reset_for_cleanup_tasks(); | |
1140 } | |
1141 | |
1142 void HeapRegionRemSet::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
1143 _other_regions.do_cleanup_work(hrrs_cleanup_task); | |
1144 } | |
1145 | |
1146 void | |
1147 HeapRegionRemSet::finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task) { | |
1148 SparsePRT::finish_cleanup_task(hrrs_cleanup_task); | |
1149 } | |
1150 | |
342 | 1151 #ifndef PRODUCT |
1152 void HeapRegionRemSet::test() { | |
1153 os::sleep(Thread::current(), (jlong)5000, false); | |
1154 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1155 | |
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1156 // Run with "-XX:G1LogRSetRegionEntries=2", so that 1 and 5 end up in same |
342 | 1157 // hash bucket. |
1158 HeapRegion* hr0 = g1h->region_at(0); | |
1159 HeapRegion* hr1 = g1h->region_at(1); | |
1160 HeapRegion* hr2 = g1h->region_at(5); | |
1161 HeapRegion* hr3 = g1h->region_at(6); | |
1162 HeapRegion* hr4 = g1h->region_at(7); | |
1163 HeapRegion* hr5 = g1h->region_at(8); | |
1164 | |
1165 HeapWord* hr1_start = hr1->bottom(); | |
1166 HeapWord* hr1_mid = hr1_start + HeapRegion::GrainWords/2; | |
1167 HeapWord* hr1_last = hr1->end() - 1; | |
1168 | |
1169 HeapWord* hr2_start = hr2->bottom(); | |
1170 HeapWord* hr2_mid = hr2_start + HeapRegion::GrainWords/2; | |
1171 HeapWord* hr2_last = hr2->end() - 1; | |
1172 | |
1173 HeapWord* hr3_start = hr3->bottom(); | |
1174 HeapWord* hr3_mid = hr3_start + HeapRegion::GrainWords/2; | |
1175 HeapWord* hr3_last = hr3->end() - 1; | |
1176 | |
1177 HeapRegionRemSet* hrrs = hr0->rem_set(); | |
1178 | |
1179 // Make three references from region 0x101... | |
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1180 hrrs->add_reference((OopOrNarrowOopStar)hr1_start); |
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1181 hrrs->add_reference((OopOrNarrowOopStar)hr1_mid); |
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1182 hrrs->add_reference((OopOrNarrowOopStar)hr1_last); |
342 | 1183 |
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1184 hrrs->add_reference((OopOrNarrowOopStar)hr2_start); |
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1185 hrrs->add_reference((OopOrNarrowOopStar)hr2_mid); |
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1186 hrrs->add_reference((OopOrNarrowOopStar)hr2_last); |
342 | 1187 |
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1188 hrrs->add_reference((OopOrNarrowOopStar)hr3_start); |
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1189 hrrs->add_reference((OopOrNarrowOopStar)hr3_mid); |
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1190 hrrs->add_reference((OopOrNarrowOopStar)hr3_last); |
342 | 1191 |
1192 // Now cause a coarsening. | |
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1193 hrrs->add_reference((OopOrNarrowOopStar)hr4->bottom()); |
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1194 hrrs->add_reference((OopOrNarrowOopStar)hr5->bottom()); |
342 | 1195 |
1196 // Now, does iteration yield these three? | |
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8011724: G1: Stack allocate instances of HeapRegionRemSetIterator
johnc
parents:
6750
diff
changeset
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1197 HeapRegionRemSetIterator iter(hrrs); |
342 | 1198 size_t sum = 0; |
1199 size_t card_index; | |
1200 while (iter.has_next(card_index)) { | |
1201 HeapWord* card_start = | |
1202 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
1203 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); | |
1204 sum++; | |
1205 } | |
1206 guarantee(sum == 11 - 3 + 2048, "Failure"); | |
1207 guarantee(sum == hrrs->occupied(), "Failure"); | |
1208 } | |
1209 #endif |