Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp @ 8081:579f6adb7f51
8003539: Minimal VM don't react to -Dcom.sun.management and -XX:+ManagementServer
Summary: A warning message should be displayed if these options are used with the Minimal VM.
Reviewed-by: dholmes, dsamersoff
author | jprovino |
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date | Tue, 05 Feb 2013 13:32:34 -0500 |
parents | 859cd1a76f8a |
children | 6f817ce50129 5c93c1f61226 |
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 |
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 PerRegionTablePtr[_max_fine_entries]; |
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286 |
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287 if (_fine_grain_regions == NULL) { |
342 | 288 vm_exit_out_of_memory(sizeof(void*)*_max_fine_entries, |
289 "Failed to allocate _fine_grain_entries."); | |
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290 } |
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291 |
342 | 292 for (size_t i = 0; i < _max_fine_entries; i++) { |
293 _fine_grain_regions[i] = NULL; | |
294 } | |
295 } | |
296 | |
6253 | 297 void OtherRegionsTable::link_to_all(PerRegionTable* prt) { |
298 // We always append to the beginning of the list for convenience; | |
299 // the order of entries in this list does not matter. | |
300 if (_first_all_fine_prts != NULL) { | |
301 assert(_first_all_fine_prts->prev() == NULL, "invariant"); | |
302 _first_all_fine_prts->set_prev(prt); | |
303 prt->set_next(_first_all_fine_prts); | |
304 } else { | |
305 // this is the first element we insert. Adjust the "last" pointer | |
306 _last_all_fine_prts = prt; | |
307 assert(prt->next() == NULL, "just checking"); | |
308 } | |
309 // the new element is always the first element without a predecessor | |
310 prt->set_prev(NULL); | |
311 _first_all_fine_prts = prt; | |
312 | |
313 assert(prt->prev() == NULL, "just checking"); | |
314 assert(_first_all_fine_prts == prt, "just checking"); | |
315 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || | |
316 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), | |
317 "just checking"); | |
318 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, | |
319 "just checking"); | |
320 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, | |
321 "just checking"); | |
322 } | |
323 | |
324 void OtherRegionsTable::unlink_from_all(PerRegionTable* prt) { | |
325 if (prt->prev() != NULL) { | |
326 assert(_first_all_fine_prts != prt, "just checking"); | |
327 prt->prev()->set_next(prt->next()); | |
328 // removing the last element in the list? | |
329 if (_last_all_fine_prts == prt) { | |
330 _last_all_fine_prts = prt->prev(); | |
331 } | |
332 } else { | |
333 assert(_first_all_fine_prts == prt, "just checking"); | |
334 _first_all_fine_prts = prt->next(); | |
335 // list is empty now? | |
336 if (_first_all_fine_prts == NULL) { | |
337 _last_all_fine_prts = NULL; | |
338 } | |
339 } | |
340 | |
341 if (prt->next() != NULL) { | |
342 prt->next()->set_prev(prt->prev()); | |
343 } | |
344 | |
345 prt->set_next(NULL); | |
346 prt->set_prev(NULL); | |
347 | |
348 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || | |
349 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), | |
350 "just checking"); | |
351 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, | |
352 "just checking"); | |
353 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, | |
354 "just checking"); | |
355 } | |
356 | |
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357 int** OtherRegionsTable::_from_card_cache = NULL; |
342 | 358 size_t OtherRegionsTable::_from_card_cache_max_regions = 0; |
359 size_t OtherRegionsTable::_from_card_cache_mem_size = 0; | |
360 | |
361 void OtherRegionsTable::init_from_card_cache(size_t max_regions) { | |
362 _from_card_cache_max_regions = max_regions; | |
363 | |
364 int n_par_rs = HeapRegionRemSet::num_par_rem_sets(); | |
6197 | 365 _from_card_cache = NEW_C_HEAP_ARRAY(int*, n_par_rs, mtGC); |
342 | 366 for (int i = 0; i < n_par_rs; i++) { |
6197 | 367 _from_card_cache[i] = NEW_C_HEAP_ARRAY(int, max_regions, mtGC); |
342 | 368 for (size_t j = 0; j < max_regions; j++) { |
369 _from_card_cache[i][j] = -1; // An invalid value. | |
370 } | |
371 } | |
372 _from_card_cache_mem_size = n_par_rs * max_regions * sizeof(int); | |
373 } | |
374 | |
375 void OtherRegionsTable::shrink_from_card_cache(size_t new_n_regs) { | |
376 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
377 assert(new_n_regs <= _from_card_cache_max_regions, "Must be within max."); | |
378 for (size_t j = new_n_regs; j < _from_card_cache_max_regions; j++) { | |
379 _from_card_cache[i][j] = -1; // An invalid value. | |
380 } | |
381 } | |
382 } | |
383 | |
384 #ifndef PRODUCT | |
385 void OtherRegionsTable::print_from_card_cache() { | |
386 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
387 for (size_t j = 0; j < _from_card_cache_max_regions; j++) { | |
388 gclog_or_tty->print_cr("_from_card_cache[%d][%d] = %d.", | |
389 i, j, _from_card_cache[i][j]); | |
390 } | |
391 } | |
392 } | |
393 #endif | |
394 | |
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395 void OtherRegionsTable::add_reference(OopOrNarrowOopStar from, int tid) { |
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396 size_t cur_hrs_ind = (size_t) hr()->hrs_index(); |
342 | 397 |
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398 if (G1TraceHeapRegionRememberedSet) { |
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399 gclog_or_tty->print_cr("ORT::add_reference_work(" PTR_FORMAT "->" PTR_FORMAT ").", |
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400 from, |
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401 UseCompressedOops |
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402 ? oopDesc::load_decode_heap_oop((narrowOop*)from) |
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403 : oopDesc::load_decode_heap_oop((oop*)from)); |
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404 } |
342 | 405 |
406 int from_card = (int)(uintptr_t(from) >> CardTableModRefBS::card_shift); | |
407 | |
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408 if (G1TraceHeapRegionRememberedSet) { |
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409 gclog_or_tty->print_cr("Table for [" PTR_FORMAT "...): card %d (cache = %d)", |
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410 hr()->bottom(), from_card, |
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411 _from_card_cache[tid][cur_hrs_ind]); |
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412 } |
342 | 413 |
414 if (from_card == _from_card_cache[tid][cur_hrs_ind]) { | |
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415 if (G1TraceHeapRegionRememberedSet) { |
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416 gclog_or_tty->print_cr(" from-card cache hit."); |
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417 } |
342 | 418 assert(contains_reference(from), "We just added it!"); |
419 return; | |
420 } else { | |
421 _from_card_cache[tid][cur_hrs_ind] = from_card; | |
422 } | |
423 | |
424 // Note that this may be a continued H region. | |
425 HeapRegion* from_hr = _g1h->heap_region_containing_raw(from); | |
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426 RegionIdx_t from_hrs_ind = (RegionIdx_t) from_hr->hrs_index(); |
342 | 427 |
428 // If the region is already coarsened, return. | |
429 if (_coarse_map.at(from_hrs_ind)) { | |
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430 if (G1TraceHeapRegionRememberedSet) { |
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431 gclog_or_tty->print_cr(" coarse map hit."); |
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432 } |
342 | 433 assert(contains_reference(from), "We just added it!"); |
434 return; | |
435 } | |
436 | |
437 // Otherwise find a per-region table to add it to. | |
438 size_t ind = from_hrs_ind & _mod_max_fine_entries_mask; | |
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439 PerRegionTable* prt = find_region_table(ind, from_hr); |
342 | 440 if (prt == NULL) { |
441 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
442 // Confirm that it's really not there... | |
443 prt = find_region_table(ind, from_hr); | |
444 if (prt == NULL) { | |
445 | |
446 uintptr_t from_hr_bot_card_index = | |
447 uintptr_t(from_hr->bottom()) | |
448 >> CardTableModRefBS::card_shift; | |
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449 CardIdx_t card_index = from_card - from_hr_bot_card_index; |
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450 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
342 | 451 "Must be in range."); |
452 if (G1HRRSUseSparseTable && | |
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453 _sparse_table.add_card(from_hrs_ind, card_index)) { |
342 | 454 if (G1RecordHRRSOops) { |
455 HeapRegionRemSet::record(hr(), from); | |
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456 if (G1TraceHeapRegionRememberedSet) { |
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457 gclog_or_tty->print(" Added card " PTR_FORMAT " to region " |
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458 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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459 align_size_down(uintptr_t(from), |
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460 CardTableModRefBS::card_size), |
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461 hr()->bottom(), from); |
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462 } |
342 | 463 } |
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464 if (G1TraceHeapRegionRememberedSet) { |
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465 gclog_or_tty->print_cr(" added card to sparse table."); |
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466 } |
342 | 467 assert(contains_reference_locked(from), "We just added it!"); |
468 return; | |
469 } else { | |
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470 if (G1TraceHeapRegionRememberedSet) { |
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471 gclog_or_tty->print_cr(" [tid %d] sparse table entry " |
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472 "overflow(f: %d, t: %d)", |
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473 tid, from_hrs_ind, cur_hrs_ind); |
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474 } |
342 | 475 } |
476 | |
477 if (_n_fine_entries == _max_fine_entries) { | |
478 prt = delete_region_table(); | |
6253 | 479 // There is no need to clear the links to the 'all' list here: |
480 // prt will be reused immediately, i.e. remain in the 'all' list. | |
481 prt->init(from_hr, false /* clear_links_to_all_list */); | |
342 | 482 } else { |
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483 prt = PerRegionTable::alloc(from_hr); |
6253 | 484 link_to_all(prt); |
342 | 485 } |
486 | |
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487 PerRegionTable* first_prt = _fine_grain_regions[ind]; |
6253 | 488 prt->set_collision_list_next(first_prt); |
342 | 489 _fine_grain_regions[ind] = prt; |
490 _n_fine_entries++; | |
491 | |
492 if (G1HRRSUseSparseTable) { | |
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493 // Transfer from sparse to fine-grain. |
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494 SparsePRTEntry *sprt_entry = _sparse_table.get_entry(from_hrs_ind); |
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495 assert(sprt_entry != NULL, "There should have been an entry"); |
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496 for (int i = 0; i < SparsePRTEntry::cards_num(); i++) { |
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497 CardIdx_t c = sprt_entry->card(i); |
342 | 498 if (c != SparsePRTEntry::NullEntry) { |
499 prt->add_card(c); | |
500 } | |
501 } | |
502 // Now we can delete the sparse entry. | |
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503 bool res = _sparse_table.delete_entry(from_hrs_ind); |
342 | 504 assert(res, "It should have been there."); |
505 } | |
506 } | |
507 assert(prt != NULL && prt->hr() == from_hr, "consequence"); | |
508 } | |
509 // Note that we can't assert "prt->hr() == from_hr", because of the | |
510 // possibility of concurrent reuse. But see head comment of | |
511 // OtherRegionsTable for why this is OK. | |
512 assert(prt != NULL, "Inv"); | |
513 | |
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514 prt->add_reference(from); |
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515 |
342 | 516 if (G1RecordHRRSOops) { |
517 HeapRegionRemSet::record(hr(), from); | |
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518 if (G1TraceHeapRegionRememberedSet) { |
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519 gclog_or_tty->print("Added card " PTR_FORMAT " to region " |
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520 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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521 align_size_down(uintptr_t(from), |
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522 CardTableModRefBS::card_size), |
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523 hr()->bottom(), from); |
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524 } |
342 | 525 } |
526 assert(contains_reference(from), "We just added it!"); | |
527 } | |
528 | |
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529 PerRegionTable* |
342 | 530 OtherRegionsTable::find_region_table(size_t ind, HeapRegion* hr) const { |
531 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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532 PerRegionTable* prt = _fine_grain_regions[ind]; |
342 | 533 while (prt != NULL && prt->hr() != hr) { |
6253 | 534 prt = prt->collision_list_next(); |
342 | 535 } |
536 // Loop postcondition is the method postcondition. | |
537 return prt; | |
538 } | |
539 | |
540 jint OtherRegionsTable::_n_coarsenings = 0; | |
541 | |
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542 PerRegionTable* OtherRegionsTable::delete_region_table() { |
342 | 543 assert(_m.owned_by_self(), "Precondition"); |
544 assert(_n_fine_entries == _max_fine_entries, "Precondition"); | |
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545 PerRegionTable* max = NULL; |
342 | 546 jint max_occ = 0; |
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547 PerRegionTable** max_prev; |
342 | 548 size_t max_ind; |
549 | |
550 size_t i = _fine_eviction_start; | |
551 for (size_t k = 0; k < _fine_eviction_sample_size; k++) { | |
552 size_t ii = i; | |
553 // Make sure we get a non-NULL sample. | |
554 while (_fine_grain_regions[ii] == NULL) { | |
555 ii++; | |
556 if (ii == _max_fine_entries) ii = 0; | |
557 guarantee(ii != i, "We must find one."); | |
558 } | |
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559 PerRegionTable** prev = &_fine_grain_regions[ii]; |
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560 PerRegionTable* cur = *prev; |
342 | 561 while (cur != NULL) { |
562 jint cur_occ = cur->occupied(); | |
563 if (max == NULL || cur_occ > max_occ) { | |
564 max = cur; | |
565 max_prev = prev; | |
566 max_ind = i; | |
567 max_occ = cur_occ; | |
568 } | |
6253 | 569 prev = cur->collision_list_next_addr(); |
570 cur = cur->collision_list_next(); | |
342 | 571 } |
572 i = i + _fine_eviction_stride; | |
573 if (i >= _n_fine_entries) i = i - _n_fine_entries; | |
574 } | |
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575 |
342 | 576 _fine_eviction_start++; |
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577 |
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578 if (_fine_eviction_start >= _n_fine_entries) { |
342 | 579 _fine_eviction_start -= _n_fine_entries; |
580 } | |
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581 |
342 | 582 guarantee(max != NULL, "Since _n_fine_entries > 0"); |
583 | |
584 // Set the corresponding coarse bit. | |
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585 size_t max_hrs_index = (size_t) max->hr()->hrs_index(); |
342 | 586 if (!_coarse_map.at(max_hrs_index)) { |
587 _coarse_map.at_put(max_hrs_index, true); | |
588 _n_coarse_entries++; | |
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589 if (G1TraceHeapRegionRememberedSet) { |
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590 gclog_or_tty->print("Coarsened entry in region [" PTR_FORMAT "...] " |
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591 "for region [" PTR_FORMAT "...] (%d coarse entries).\n", |
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592 hr()->bottom(), |
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593 max->hr()->bottom(), |
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594 _n_coarse_entries); |
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595 } |
342 | 596 } |
597 | |
598 // Unsplice. | |
6253 | 599 *max_prev = max->collision_list_next(); |
342 | 600 Atomic::inc(&_n_coarsenings); |
601 _n_fine_entries--; | |
602 return max; | |
603 } | |
604 | |
605 | |
606 // At present, this must be called stop-world single-threaded. | |
607 void OtherRegionsTable::scrub(CardTableModRefBS* ctbs, | |
608 BitMap* region_bm, BitMap* card_bm) { | |
609 // First eliminated garbage regions from the coarse map. | |
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610 if (G1RSScrubVerbose) { |
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611 gclog_or_tty->print_cr("Scrubbing region %u:", hr()->hrs_index()); |
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612 } |
342 | 613 |
614 assert(_coarse_map.size() == region_bm->size(), "Precondition"); | |
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615 if (G1RSScrubVerbose) { |
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616 gclog_or_tty->print(" Coarse map: before = "SIZE_FORMAT"...", |
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617 _n_coarse_entries); |
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618 } |
342 | 619 _coarse_map.set_intersection(*region_bm); |
620 _n_coarse_entries = _coarse_map.count_one_bits(); | |
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621 if (G1RSScrubVerbose) { |
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622 gclog_or_tty->print_cr(" after = "SIZE_FORMAT".", _n_coarse_entries); |
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623 } |
342 | 624 |
625 // Now do the fine-grained maps. | |
626 for (size_t i = 0; i < _max_fine_entries; i++) { | |
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627 PerRegionTable* cur = _fine_grain_regions[i]; |
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628 PerRegionTable** prev = &_fine_grain_regions[i]; |
342 | 629 while (cur != NULL) { |
6253 | 630 PerRegionTable* nxt = cur->collision_list_next(); |
342 | 631 // If the entire region is dead, eliminate. |
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632 if (G1RSScrubVerbose) { |
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633 gclog_or_tty->print_cr(" For other region %u:", |
3766 | 634 cur->hr()->hrs_index()); |
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635 } |
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636 if (!region_bm->at((size_t) cur->hr()->hrs_index())) { |
342 | 637 *prev = nxt; |
6253 | 638 cur->set_collision_list_next(NULL); |
342 | 639 _n_fine_entries--; |
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640 if (G1RSScrubVerbose) { |
342 | 641 gclog_or_tty->print_cr(" deleted via region map."); |
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642 } |
6253 | 643 unlink_from_all(cur); |
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644 PerRegionTable::free(cur); |
342 | 645 } else { |
646 // Do fine-grain elimination. | |
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647 if (G1RSScrubVerbose) { |
342 | 648 gclog_or_tty->print(" occ: before = %4d.", cur->occupied()); |
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649 } |
342 | 650 cur->scrub(ctbs, card_bm); |
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651 if (G1RSScrubVerbose) { |
342 | 652 gclog_or_tty->print_cr(" after = %4d.", cur->occupied()); |
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653 } |
342 | 654 // Did that empty the table completely? |
655 if (cur->occupied() == 0) { | |
656 *prev = nxt; | |
6253 | 657 cur->set_collision_list_next(NULL); |
342 | 658 _n_fine_entries--; |
6253 | 659 unlink_from_all(cur); |
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660 PerRegionTable::free(cur); |
342 | 661 } else { |
6253 | 662 prev = cur->collision_list_next_addr(); |
342 | 663 } |
664 } | |
665 cur = nxt; | |
666 } | |
667 } | |
668 // Since we may have deleted a from_card_cache entry from the RS, clear | |
669 // the FCC. | |
670 clear_fcc(); | |
671 } | |
672 | |
673 | |
674 size_t OtherRegionsTable::occupied() const { | |
675 // Cast away const in this case. | |
676 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
677 size_t sum = occ_fine(); | |
678 sum += occ_sparse(); | |
679 sum += occ_coarse(); | |
680 return sum; | |
681 } | |
682 | |
683 size_t OtherRegionsTable::occ_fine() const { | |
684 size_t sum = 0; | |
6253 | 685 |
686 size_t num = 0; | |
687 PerRegionTable * cur = _first_all_fine_prts; | |
688 while (cur != NULL) { | |
689 sum += cur->occupied(); | |
690 cur = cur->next(); | |
691 num++; | |
342 | 692 } |
6253 | 693 guarantee(num == _n_fine_entries, "just checking"); |
342 | 694 return sum; |
695 } | |
696 | |
697 size_t OtherRegionsTable::occ_coarse() const { | |
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698 return (_n_coarse_entries * HeapRegion::CardsPerRegion); |
342 | 699 } |
700 | |
701 size_t OtherRegionsTable::occ_sparse() const { | |
702 return _sparse_table.occupied(); | |
703 } | |
704 | |
705 size_t OtherRegionsTable::mem_size() const { | |
706 // Cast away const in this case. | |
707 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
708 size_t sum = 0; | |
6253 | 709 PerRegionTable * cur = _first_all_fine_prts; |
710 while (cur != NULL) { | |
711 sum += cur->mem_size(); | |
712 cur = cur->next(); | |
342 | 713 } |
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714 sum += (sizeof(PerRegionTable*) * _max_fine_entries); |
342 | 715 sum += (_coarse_map.size_in_words() * HeapWordSize); |
716 sum += (_sparse_table.mem_size()); | |
717 sum += sizeof(*this) - sizeof(_sparse_table); // Avoid double counting above. | |
718 return sum; | |
719 } | |
720 | |
721 size_t OtherRegionsTable::static_mem_size() { | |
722 return _from_card_cache_mem_size; | |
723 } | |
724 | |
725 size_t OtherRegionsTable::fl_mem_size() { | |
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726 return PerRegionTable::fl_mem_size(); |
342 | 727 } |
728 | |
729 void OtherRegionsTable::clear_fcc() { | |
6253 | 730 size_t hrs_idx = hr()->hrs_index(); |
342 | 731 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { |
6253 | 732 _from_card_cache[i][hrs_idx] = -1; |
342 | 733 } |
734 } | |
735 | |
736 void OtherRegionsTable::clear() { | |
737 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
6253 | 738 // if there are no entries, skip this step |
739 if (_first_all_fine_prts != NULL) { | |
740 guarantee(_first_all_fine_prts != NULL && _last_all_fine_prts != NULL, "just checking"); | |
741 PerRegionTable::bulk_free(_first_all_fine_prts, _last_all_fine_prts); | |
742 memset(_fine_grain_regions, 0, _max_fine_entries * sizeof(_fine_grain_regions[0])); | |
743 } else { | |
744 guarantee(_first_all_fine_prts == NULL && _last_all_fine_prts == NULL, "just checking"); | |
342 | 745 } |
6253 | 746 |
747 _first_all_fine_prts = _last_all_fine_prts = NULL; | |
342 | 748 _sparse_table.clear(); |
749 _coarse_map.clear(); | |
750 _n_fine_entries = 0; | |
751 _n_coarse_entries = 0; | |
752 | |
753 clear_fcc(); | |
754 } | |
755 | |
756 void OtherRegionsTable::clear_incoming_entry(HeapRegion* from_hr) { | |
757 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); | |
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758 size_t hrs_ind = (size_t) from_hr->hrs_index(); |
342 | 759 size_t ind = hrs_ind & _mod_max_fine_entries_mask; |
760 if (del_single_region_table(ind, from_hr)) { | |
761 assert(!_coarse_map.at(hrs_ind), "Inv"); | |
762 } else { | |
763 _coarse_map.par_at_put(hrs_ind, 0); | |
764 } | |
765 // Check to see if any of the fcc entries come from here. | |
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766 size_t hr_ind = (size_t) hr()->hrs_index(); |
342 | 767 for (int tid = 0; tid < HeapRegionRemSet::num_par_rem_sets(); tid++) { |
768 int fcc_ent = _from_card_cache[tid][hr_ind]; | |
769 if (fcc_ent != -1) { | |
770 HeapWord* card_addr = (HeapWord*) | |
771 (uintptr_t(fcc_ent) << CardTableModRefBS::card_shift); | |
772 if (hr()->is_in_reserved(card_addr)) { | |
773 // Clear the from card cache. | |
774 _from_card_cache[tid][hr_ind] = -1; | |
775 } | |
776 } | |
777 } | |
778 } | |
779 | |
780 bool OtherRegionsTable::del_single_region_table(size_t ind, | |
781 HeapRegion* hr) { | |
782 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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783 PerRegionTable** prev_addr = &_fine_grain_regions[ind]; |
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784 PerRegionTable* prt = *prev_addr; |
342 | 785 while (prt != NULL && prt->hr() != hr) { |
6253 | 786 prev_addr = prt->collision_list_next_addr(); |
787 prt = prt->collision_list_next(); | |
342 | 788 } |
789 if (prt != NULL) { | |
790 assert(prt->hr() == hr, "Loop postcondition."); | |
6253 | 791 *prev_addr = prt->collision_list_next(); |
792 unlink_from_all(prt); | |
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793 PerRegionTable::free(prt); |
342 | 794 _n_fine_entries--; |
795 return true; | |
796 } else { | |
797 return false; | |
798 } | |
799 } | |
800 | |
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801 bool OtherRegionsTable::contains_reference(OopOrNarrowOopStar from) const { |
342 | 802 // Cast away const in this case. |
803 MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag); | |
804 return contains_reference_locked(from); | |
805 } | |
806 | |
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807 bool OtherRegionsTable::contains_reference_locked(OopOrNarrowOopStar from) const { |
342 | 808 HeapRegion* hr = _g1h->heap_region_containing_raw(from); |
809 if (hr == NULL) return false; | |
807
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810 RegionIdx_t hr_ind = (RegionIdx_t) hr->hrs_index(); |
342 | 811 // Is this region in the coarse map? |
812 if (_coarse_map.at(hr_ind)) return true; | |
813 | |
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814 PerRegionTable* prt = find_region_table(hr_ind & _mod_max_fine_entries_mask, |
342 | 815 hr); |
816 if (prt != NULL) { | |
817 return prt->contains_reference(from); | |
818 | |
819 } else { | |
820 uintptr_t from_card = | |
821 (uintptr_t(from) >> CardTableModRefBS::card_shift); | |
822 uintptr_t hr_bot_card_index = | |
823 uintptr_t(hr->bottom()) >> CardTableModRefBS::card_shift; | |
824 assert(from_card >= hr_bot_card_index, "Inv"); | |
807
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825 CardIdx_t card_index = from_card - hr_bot_card_index; |
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826 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
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827 "Must be in range."); |
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828 return _sparse_table.contains_card(hr_ind, card_index); |
342 | 829 } |
830 | |
831 | |
832 } | |
833 | |
2173 | 834 void |
835 OtherRegionsTable::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
836 _sparse_table.do_cleanup_work(hrrs_cleanup_task); | |
837 } | |
838 | |
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839 // Determines how many threads can add records to an rset in parallel. |
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840 // This can be done by either mutator threads together with the |
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841 // concurrent refinement threads or GC threads. |
342 | 842 int HeapRegionRemSet::num_par_rem_sets() { |
795
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843 return (int)MAX2(DirtyCardQueueSet::num_par_ids() + ConcurrentG1Refine::thread_num(), ParallelGCThreads); |
342 | 844 } |
845 | |
846 HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, | |
847 HeapRegion* hr) | |
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848 : _bosa(bosa), _other_regions(hr) { |
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849 reset_for_par_iteration(); |
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850 } |
342 | 851 |
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852 void HeapRegionRemSet::setup_remset_size() { |
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853 // Setup sparse and fine-grain tables sizes. |
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854 // table_size = base * (log(region_size / 1M) + 1) |
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855 const int LOG_M = 20; |
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856 int region_size_log_mb = MAX2(HeapRegion::LogOfHRGrainBytes - LOG_M, 0); |
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857 if (FLAG_IS_DEFAULT(G1RSetSparseRegionEntries)) { |
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858 G1RSetSparseRegionEntries = G1RSetSparseRegionEntriesBase * (region_size_log_mb + 1); |
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859 } |
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860 if (FLAG_IS_DEFAULT(G1RSetRegionEntries)) { |
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861 G1RSetRegionEntries = G1RSetRegionEntriesBase * (region_size_log_mb + 1); |
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862 } |
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863 guarantee(G1RSetSparseRegionEntries > 0 && G1RSetRegionEntries > 0 , "Sanity"); |
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864 } |
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865 |
342 | 866 bool HeapRegionRemSet::claim_iter() { |
867 if (_iter_state != Unclaimed) return false; | |
868 jint res = Atomic::cmpxchg(Claimed, (jint*)(&_iter_state), Unclaimed); | |
869 return (res == Unclaimed); | |
870 } | |
871 | |
872 void HeapRegionRemSet::set_iter_complete() { | |
873 _iter_state = Complete; | |
874 } | |
875 | |
876 bool HeapRegionRemSet::iter_is_complete() { | |
877 return _iter_state == Complete; | |
878 } | |
879 | |
880 void HeapRegionRemSet::init_iterator(HeapRegionRemSetIterator* iter) const { | |
881 iter->initialize(this); | |
882 } | |
883 | |
884 #ifndef PRODUCT | |
885 void HeapRegionRemSet::print() const { | |
886 HeapRegionRemSetIterator iter; | |
887 init_iterator(&iter); | |
888 size_t card_index; | |
889 while (iter.has_next(card_index)) { | |
890 HeapWord* card_start = | |
891 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
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892 gclog_or_tty->print_cr(" Card " PTR_FORMAT, card_start); |
342 | 893 } |
894 if (iter.n_yielded() != occupied()) { | |
895 gclog_or_tty->print_cr("Yielded disagrees with occupied:"); | |
896 gclog_or_tty->print_cr(" %6d yielded (%6d coarse, %6d fine).", | |
897 iter.n_yielded(), | |
898 iter.n_yielded_coarse(), iter.n_yielded_fine()); | |
899 gclog_or_tty->print_cr(" %6d occ (%6d coarse, %6d fine).", | |
900 occupied(), occ_coarse(), occ_fine()); | |
901 } | |
902 guarantee(iter.n_yielded() == occupied(), | |
903 "We should have yielded all the represented cards."); | |
904 } | |
905 #endif | |
906 | |
907 void HeapRegionRemSet::cleanup() { | |
908 SparsePRT::cleanup_all(); | |
909 } | |
910 | |
911 void HeapRegionRemSet::clear() { | |
912 _other_regions.clear(); | |
913 assert(occupied() == 0, "Should be clear."); | |
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914 reset_for_par_iteration(); |
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915 } |
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916 |
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917 void HeapRegionRemSet::reset_for_par_iteration() { |
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918 _iter_state = Unclaimed; |
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919 _iter_claimed = 0; |
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920 // It's good to check this to make sure that the two methods are in sync. |
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921 assert(verify_ready_for_par_iteration(), "post-condition"); |
342 | 922 } |
923 | |
924 void HeapRegionRemSet::scrub(CardTableModRefBS* ctbs, | |
925 BitMap* region_bm, BitMap* card_bm) { | |
926 _other_regions.scrub(ctbs, region_bm, card_bm); | |
927 } | |
928 | |
929 //-------------------- Iteration -------------------- | |
930 | |
931 HeapRegionRemSetIterator:: | |
932 HeapRegionRemSetIterator() : | |
933 _hrrs(NULL), | |
934 _g1h(G1CollectedHeap::heap()), | |
935 _bosa(NULL), | |
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936 _sparse_iter() { } |
342 | 937 |
938 void HeapRegionRemSetIterator::initialize(const HeapRegionRemSet* hrrs) { | |
939 _hrrs = hrrs; | |
940 _coarse_map = &_hrrs->_other_regions._coarse_map; | |
941 _fine_grain_regions = _hrrs->_other_regions._fine_grain_regions; | |
942 _bosa = _hrrs->bosa(); | |
943 | |
944 _is = Sparse; | |
945 // Set these values so that we increment to the first region. | |
946 _coarse_cur_region_index = -1; | |
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947 _coarse_cur_region_cur_card = (HeapRegion::CardsPerRegion-1); |
342 | 948 |
949 _cur_region_cur_card = 0; | |
950 | |
951 _fine_array_index = -1; | |
952 _fine_cur_prt = NULL; | |
953 | |
954 _n_yielded_coarse = 0; | |
955 _n_yielded_fine = 0; | |
956 _n_yielded_sparse = 0; | |
957 | |
958 _sparse_iter.init(&hrrs->_other_regions._sparse_table); | |
959 } | |
960 | |
961 bool HeapRegionRemSetIterator::coarse_has_next(size_t& card_index) { | |
962 if (_hrrs->_other_regions._n_coarse_entries == 0) return false; | |
963 // Go to the next card. | |
964 _coarse_cur_region_cur_card++; | |
965 // Was the last the last card in the current region? | |
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966 if (_coarse_cur_region_cur_card == HeapRegion::CardsPerRegion) { |
342 | 967 // Yes: find the next region. This may leave _coarse_cur_region_index |
968 // Set to the last index, in which case there are no more coarse | |
969 // regions. | |
970 _coarse_cur_region_index = | |
971 (int) _coarse_map->get_next_one_offset(_coarse_cur_region_index + 1); | |
972 if ((size_t)_coarse_cur_region_index < _coarse_map->size()) { | |
973 _coarse_cur_region_cur_card = 0; | |
974 HeapWord* r_bot = | |
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975 _g1h->region_at((uint) _coarse_cur_region_index)->bottom(); |
342 | 976 _cur_region_card_offset = _bosa->index_for(r_bot); |
977 } else { | |
978 return false; | |
979 } | |
980 } | |
981 // If we didn't return false above, then we can yield a card. | |
982 card_index = _cur_region_card_offset + _coarse_cur_region_cur_card; | |
983 return true; | |
984 } | |
985 | |
986 void HeapRegionRemSetIterator::fine_find_next_non_null_prt() { | |
987 // Otherwise, find the next bucket list in the array. | |
988 _fine_array_index++; | |
989 while (_fine_array_index < (int) OtherRegionsTable::_max_fine_entries) { | |
990 _fine_cur_prt = _fine_grain_regions[_fine_array_index]; | |
991 if (_fine_cur_prt != NULL) return; | |
992 else _fine_array_index++; | |
993 } | |
994 assert(_fine_cur_prt == NULL, "Loop post"); | |
995 } | |
996 | |
997 bool HeapRegionRemSetIterator::fine_has_next(size_t& card_index) { | |
998 if (fine_has_next()) { | |
999 _cur_region_cur_card = | |
1000 _fine_cur_prt->_bm.get_next_one_offset(_cur_region_cur_card + 1); | |
1001 } | |
1002 while (!fine_has_next()) { | |
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1003 if (_cur_region_cur_card == (size_t) HeapRegion::CardsPerRegion) { |
342 | 1004 _cur_region_cur_card = 0; |
6253 | 1005 _fine_cur_prt = _fine_cur_prt->collision_list_next(); |
342 | 1006 } |
1007 if (_fine_cur_prt == NULL) { | |
1008 fine_find_next_non_null_prt(); | |
1009 if (_fine_cur_prt == NULL) return false; | |
1010 } | |
1011 assert(_fine_cur_prt != NULL && _cur_region_cur_card == 0, | |
1012 "inv."); | |
1013 HeapWord* r_bot = | |
1014 _fine_cur_prt->hr()->bottom(); | |
1015 _cur_region_card_offset = _bosa->index_for(r_bot); | |
1016 _cur_region_cur_card = _fine_cur_prt->_bm.get_next_one_offset(0); | |
1017 } | |
1018 assert(fine_has_next(), "Or else we exited the loop via the return."); | |
1019 card_index = _cur_region_card_offset + _cur_region_cur_card; | |
1020 return true; | |
1021 } | |
1022 | |
1023 bool HeapRegionRemSetIterator::fine_has_next() { | |
1024 return | |
1025 _fine_cur_prt != NULL && | |
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1026 _cur_region_cur_card < HeapRegion::CardsPerRegion; |
342 | 1027 } |
1028 | |
1029 bool HeapRegionRemSetIterator::has_next(size_t& card_index) { | |
1030 switch (_is) { | |
1031 case Sparse: | |
1032 if (_sparse_iter.has_next(card_index)) { | |
1033 _n_yielded_sparse++; | |
1034 return true; | |
1035 } | |
1036 // Otherwise, deliberate fall-through | |
1037 _is = Fine; | |
1038 case Fine: | |
1039 if (fine_has_next(card_index)) { | |
1040 _n_yielded_fine++; | |
1041 return true; | |
1042 } | |
1043 // Otherwise, deliberate fall-through | |
1044 _is = Coarse; | |
1045 case Coarse: | |
1046 if (coarse_has_next(card_index)) { | |
1047 _n_yielded_coarse++; | |
1048 return true; | |
1049 } | |
1050 // Otherwise... | |
1051 break; | |
1052 } | |
1053 assert(ParallelGCThreads > 1 || | |
1054 n_yielded() == _hrrs->occupied(), | |
1055 "Should have yielded all the cards in the rem set " | |
1056 "(in the non-par case)."); | |
1057 return false; | |
1058 } | |
1059 | |
1060 | |
1061 | |
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1062 OopOrNarrowOopStar* HeapRegionRemSet::_recorded_oops = NULL; |
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1063 HeapWord** HeapRegionRemSet::_recorded_cards = NULL; |
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1064 HeapRegion** HeapRegionRemSet::_recorded_regions = NULL; |
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1065 int HeapRegionRemSet::_n_recorded = 0; |
342 | 1066 |
1067 HeapRegionRemSet::Event* HeapRegionRemSet::_recorded_events = NULL; | |
1068 int* HeapRegionRemSet::_recorded_event_index = NULL; | |
1069 int HeapRegionRemSet::_n_recorded_events = 0; | |
1070 | |
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1071 void HeapRegionRemSet::record(HeapRegion* hr, OopOrNarrowOopStar f) { |
342 | 1072 if (_recorded_oops == NULL) { |
1073 assert(_n_recorded == 0 | |
1074 && _recorded_cards == NULL | |
1075 && _recorded_regions == NULL, | |
1076 "Inv"); | |
6197 | 1077 _recorded_oops = NEW_C_HEAP_ARRAY(OopOrNarrowOopStar, MaxRecorded, mtGC); |
1078 _recorded_cards = NEW_C_HEAP_ARRAY(HeapWord*, MaxRecorded, mtGC); | |
1079 _recorded_regions = NEW_C_HEAP_ARRAY(HeapRegion*, MaxRecorded, mtGC); | |
342 | 1080 } |
1081 if (_n_recorded == MaxRecorded) { | |
1082 gclog_or_tty->print_cr("Filled up 'recorded' (%d).", MaxRecorded); | |
1083 } else { | |
1084 _recorded_cards[_n_recorded] = | |
1085 (HeapWord*)align_size_down(uintptr_t(f), | |
1086 CardTableModRefBS::card_size); | |
1087 _recorded_oops[_n_recorded] = f; | |
1088 _recorded_regions[_n_recorded] = hr; | |
1089 _n_recorded++; | |
1090 } | |
1091 } | |
1092 | |
1093 void HeapRegionRemSet::record_event(Event evnt) { | |
1094 if (!G1RecordHRRSEvents) return; | |
1095 | |
1096 if (_recorded_events == NULL) { | |
1097 assert(_n_recorded_events == 0 | |
1098 && _recorded_event_index == NULL, | |
1099 "Inv"); | |
6197 | 1100 _recorded_events = NEW_C_HEAP_ARRAY(Event, MaxRecordedEvents, mtGC); |
1101 _recorded_event_index = NEW_C_HEAP_ARRAY(int, MaxRecordedEvents, mtGC); | |
342 | 1102 } |
1103 if (_n_recorded_events == MaxRecordedEvents) { | |
1104 gclog_or_tty->print_cr("Filled up 'recorded_events' (%d).", MaxRecordedEvents); | |
1105 } else { | |
1106 _recorded_events[_n_recorded_events] = evnt; | |
1107 _recorded_event_index[_n_recorded_events] = _n_recorded; | |
1108 _n_recorded_events++; | |
1109 } | |
1110 } | |
1111 | |
1112 void HeapRegionRemSet::print_event(outputStream* str, Event evnt) { | |
1113 switch (evnt) { | |
1114 case Event_EvacStart: | |
1115 str->print("Evac Start"); | |
1116 break; | |
1117 case Event_EvacEnd: | |
1118 str->print("Evac End"); | |
1119 break; | |
1120 case Event_RSUpdateEnd: | |
1121 str->print("RS Update End"); | |
1122 break; | |
1123 } | |
1124 } | |
1125 | |
1126 void HeapRegionRemSet::print_recorded() { | |
1127 int cur_evnt = 0; | |
1128 Event cur_evnt_kind; | |
1129 int cur_evnt_ind = 0; | |
1130 if (_n_recorded_events > 0) { | |
1131 cur_evnt_kind = _recorded_events[cur_evnt]; | |
1132 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
1133 } | |
1134 | |
1135 for (int i = 0; i < _n_recorded; i++) { | |
1136 while (cur_evnt < _n_recorded_events && i == cur_evnt_ind) { | |
1137 gclog_or_tty->print("Event: "); | |
1138 print_event(gclog_or_tty, cur_evnt_kind); | |
1139 gclog_or_tty->print_cr(""); | |
1140 cur_evnt++; | |
1141 if (cur_evnt < MaxRecordedEvents) { | |
1142 cur_evnt_kind = _recorded_events[cur_evnt]; | |
1143 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
1144 } | |
1145 } | |
1146 gclog_or_tty->print("Added card " PTR_FORMAT " to region [" PTR_FORMAT "...]" | |
1147 " for ref " PTR_FORMAT ".\n", | |
1148 _recorded_cards[i], _recorded_regions[i]->bottom(), | |
1149 _recorded_oops[i]); | |
1150 } | |
1151 } | |
1152 | |
2173 | 1153 void HeapRegionRemSet::reset_for_cleanup_tasks() { |
1154 SparsePRT::reset_for_cleanup_tasks(); | |
1155 } | |
1156 | |
1157 void HeapRegionRemSet::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
1158 _other_regions.do_cleanup_work(hrrs_cleanup_task); | |
1159 } | |
1160 | |
1161 void | |
1162 HeapRegionRemSet::finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task) { | |
1163 SparsePRT::finish_cleanup_task(hrrs_cleanup_task); | |
1164 } | |
1165 | |
342 | 1166 #ifndef PRODUCT |
1167 void HeapRegionRemSet::test() { | |
1168 os::sleep(Thread::current(), (jlong)5000, false); | |
1169 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1170 | |
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1171 // Run with "-XX:G1LogRSetRegionEntries=2", so that 1 and 5 end up in same |
342 | 1172 // hash bucket. |
1173 HeapRegion* hr0 = g1h->region_at(0); | |
1174 HeapRegion* hr1 = g1h->region_at(1); | |
1175 HeapRegion* hr2 = g1h->region_at(5); | |
1176 HeapRegion* hr3 = g1h->region_at(6); | |
1177 HeapRegion* hr4 = g1h->region_at(7); | |
1178 HeapRegion* hr5 = g1h->region_at(8); | |
1179 | |
1180 HeapWord* hr1_start = hr1->bottom(); | |
1181 HeapWord* hr1_mid = hr1_start + HeapRegion::GrainWords/2; | |
1182 HeapWord* hr1_last = hr1->end() - 1; | |
1183 | |
1184 HeapWord* hr2_start = hr2->bottom(); | |
1185 HeapWord* hr2_mid = hr2_start + HeapRegion::GrainWords/2; | |
1186 HeapWord* hr2_last = hr2->end() - 1; | |
1187 | |
1188 HeapWord* hr3_start = hr3->bottom(); | |
1189 HeapWord* hr3_mid = hr3_start + HeapRegion::GrainWords/2; | |
1190 HeapWord* hr3_last = hr3->end() - 1; | |
1191 | |
1192 HeapRegionRemSet* hrrs = hr0->rem_set(); | |
1193 | |
1194 // Make three references from region 0x101... | |
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1195 hrrs->add_reference((OopOrNarrowOopStar)hr1_start); |
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1196 hrrs->add_reference((OopOrNarrowOopStar)hr1_mid); |
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1197 hrrs->add_reference((OopOrNarrowOopStar)hr1_last); |
342 | 1198 |
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1199 hrrs->add_reference((OopOrNarrowOopStar)hr2_start); |
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1200 hrrs->add_reference((OopOrNarrowOopStar)hr2_mid); |
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1201 hrrs->add_reference((OopOrNarrowOopStar)hr2_last); |
342 | 1202 |
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1203 hrrs->add_reference((OopOrNarrowOopStar)hr3_start); |
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1204 hrrs->add_reference((OopOrNarrowOopStar)hr3_mid); |
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1205 hrrs->add_reference((OopOrNarrowOopStar)hr3_last); |
342 | 1206 |
1207 // Now cause a coarsening. | |
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1208 hrrs->add_reference((OopOrNarrowOopStar)hr4->bottom()); |
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1209 hrrs->add_reference((OopOrNarrowOopStar)hr5->bottom()); |
342 | 1210 |
1211 // Now, does iteration yield these three? | |
1212 HeapRegionRemSetIterator iter; | |
1213 hrrs->init_iterator(&iter); | |
1214 size_t sum = 0; | |
1215 size_t card_index; | |
1216 while (iter.has_next(card_index)) { | |
1217 HeapWord* card_start = | |
1218 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
1219 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); | |
1220 sum++; | |
1221 } | |
1222 guarantee(sum == 11 - 3 + 2048, "Failure"); | |
1223 guarantee(sum == hrrs->occupied(), "Failure"); | |
1224 } | |
1225 #endif |