Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp @ 17753:191174b49bec
8035406: Improve data structure for Code Cache remembered sets
Summary: Change the code cache remembered sets data structure from a GrowableArray to a chunked list of nmethods. This makes the data structure more amenable to parallelization, and decreases freeing time.
Reviewed-by: mgerdin, brutisso
author | tschatzl |
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date | Mon, 24 Mar 2014 15:30:14 +0100 |
parents | 28674af341ac |
children | d7070f371770 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
27 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" | |
28 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
29 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
30 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
31 #include "memory/allocation.hpp" | |
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" | |
12080 | 36 #include "utilities/growableArray.hpp" |
342 | 37 |
6197 | 38 class PerRegionTable: public CHeapObj<mtGC> { |
342 | 39 friend class OtherRegionsTable; |
40 friend class HeapRegionRemSetIterator; | |
41 | |
42 HeapRegion* _hr; | |
43 BitMap _bm; | |
44 jint _occupied; | |
45 | |
6253 | 46 // next pointer for free/allocated 'all' list |
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47 PerRegionTable* _next; |
342 | 48 |
6253 | 49 // prev pointer for the allocated 'all' list |
50 PerRegionTable* _prev; | |
342 | 51 |
6253 | 52 // next pointer in collision list |
53 PerRegionTable * _collision_list_next; | |
342 | 54 |
6253 | 55 // Global free list of PRTs |
56 static PerRegionTable* _free_list; | |
342 | 57 |
58 protected: | |
59 // We need access in order to union things into the base table. | |
60 BitMap* bm() { return &_bm; } | |
61 | |
62 void recount_occupied() { | |
63 _occupied = (jint) bm()->count_one_bits(); | |
64 } | |
65 | |
66 PerRegionTable(HeapRegion* hr) : | |
67 _hr(hr), | |
68 _occupied(0), | |
6253 | 69 _bm(HeapRegion::CardsPerRegion, false /* in-resource-area */), |
70 _collision_list_next(NULL), _next(NULL), _prev(NULL) | |
342 | 71 {} |
72 | |
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73 void add_card_work(CardIdx_t from_card, bool par) { |
342 | 74 if (!_bm.at(from_card)) { |
75 if (par) { | |
76 if (_bm.par_at_put(from_card, 1)) { | |
77 Atomic::inc(&_occupied); | |
78 } | |
79 } else { | |
80 _bm.at_put(from_card, 1); | |
81 _occupied++; | |
82 } | |
83 } | |
84 } | |
85 | |
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86 void add_reference_work(OopOrNarrowOopStar from, bool par) { |
342 | 87 // Must make this robust in case "from" is not in "_hr", because of |
88 // concurrency. | |
89 | |
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90 if (G1TraceHeapRegionRememberedSet) { |
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91 gclog_or_tty->print_cr(" PRT::Add_reference_work(" PTR_FORMAT "->" PTR_FORMAT").", |
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92 from, |
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93 UseCompressedOops |
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94 ? (void *)oopDesc::load_decode_heap_oop((narrowOop*)from) |
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95 : (void *)oopDesc::load_decode_heap_oop((oop*)from)); |
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96 } |
342 | 97 |
98 HeapRegion* loc_hr = hr(); | |
99 // If the test below fails, then this table was reused concurrently | |
100 // with this operation. This is OK, since the old table was coarsened, | |
101 // and adding a bit to the new table is never incorrect. | |
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102 // If the table used to belong to a continues humongous region and is |
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103 // now reused for the corresponding start humongous region, we need to |
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104 // make sure that we detect this. Thus, we call is_in_reserved_raw() |
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105 // instead of just is_in_reserved() here. |
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106 if (loc_hr->is_in_reserved_raw(from)) { |
342 | 107 size_t hw_offset = pointer_delta((HeapWord*)from, loc_hr->bottom()); |
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108 CardIdx_t from_card = (CardIdx_t) |
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109 hw_offset >> (CardTableModRefBS::card_shift - LogHeapWordSize); |
342 | 110 |
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111 assert(0 <= from_card && (size_t)from_card < HeapRegion::CardsPerRegion, |
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112 "Must be in range."); |
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113 add_card_work(from_card, par); |
342 | 114 } |
115 } | |
116 | |
117 public: | |
118 | |
119 HeapRegion* hr() const { return _hr; } | |
120 | |
121 jint occupied() const { | |
122 // Overkill, but if we ever need it... | |
123 // guarantee(_occupied == _bm.count_one_bits(), "Check"); | |
124 return _occupied; | |
125 } | |
126 | |
6253 | 127 void init(HeapRegion* hr, bool clear_links_to_all_list) { |
128 if (clear_links_to_all_list) { | |
129 set_next(NULL); | |
130 set_prev(NULL); | |
131 } | |
342 | 132 _hr = hr; |
6253 | 133 _collision_list_next = NULL; |
342 | 134 _occupied = 0; |
135 _bm.clear(); | |
136 } | |
137 | |
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138 void add_reference(OopOrNarrowOopStar from) { |
342 | 139 add_reference_work(from, /*parallel*/ true); |
140 } | |
141 | |
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142 void seq_add_reference(OopOrNarrowOopStar from) { |
342 | 143 add_reference_work(from, /*parallel*/ false); |
144 } | |
145 | |
146 void scrub(CardTableModRefBS* ctbs, BitMap* card_bm) { | |
147 HeapWord* hr_bot = hr()->bottom(); | |
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148 size_t hr_first_card_index = ctbs->index_for(hr_bot); |
342 | 149 bm()->set_intersection_at_offset(*card_bm, hr_first_card_index); |
150 recount_occupied(); | |
151 } | |
152 | |
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153 void add_card(CardIdx_t from_card_index) { |
342 | 154 add_card_work(from_card_index, /*parallel*/ true); |
155 } | |
156 | |
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157 void seq_add_card(CardIdx_t from_card_index) { |
342 | 158 add_card_work(from_card_index, /*parallel*/ false); |
159 } | |
160 | |
161 // (Destructively) union the bitmap of the current table into the given | |
162 // bitmap (which is assumed to be of the same size.) | |
163 void union_bitmap_into(BitMap* bm) { | |
164 bm->set_union(_bm); | |
165 } | |
166 | |
167 // Mem size in bytes. | |
168 size_t mem_size() const { | |
169 return sizeof(this) + _bm.size_in_words() * HeapWordSize; | |
170 } | |
171 | |
172 // Requires "from" to be in "hr()". | |
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173 bool contains_reference(OopOrNarrowOopStar from) const { |
342 | 174 assert(hr()->is_in_reserved(from), "Precondition."); |
175 size_t card_ind = pointer_delta(from, hr()->bottom(), | |
176 CardTableModRefBS::card_size); | |
177 return _bm.at(card_ind); | |
178 } | |
179 | |
6253 | 180 // Bulk-free the PRTs from prt to last, assumes that they are |
181 // linked together using their _next field. | |
182 static void bulk_free(PerRegionTable* prt, PerRegionTable* last) { | |
342 | 183 while (true) { |
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184 PerRegionTable* fl = _free_list; |
6253 | 185 last->set_next(fl); |
186 PerRegionTable* res = (PerRegionTable*) Atomic::cmpxchg_ptr(prt, &_free_list, fl); | |
187 if (res == fl) { | |
188 return; | |
189 } | |
342 | 190 } |
191 ShouldNotReachHere(); | |
192 } | |
193 | |
6253 | 194 static void free(PerRegionTable* prt) { |
195 bulk_free(prt, prt); | |
196 } | |
197 | |
198 // Returns an initialized PerRegionTable instance. | |
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199 static PerRegionTable* alloc(HeapRegion* hr) { |
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200 PerRegionTable* fl = _free_list; |
342 | 201 while (fl != NULL) { |
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202 PerRegionTable* nxt = fl->next(); |
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203 PerRegionTable* res = |
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204 (PerRegionTable*) |
342 | 205 Atomic::cmpxchg_ptr(nxt, &_free_list, fl); |
206 if (res == fl) { | |
6253 | 207 fl->init(hr, true); |
342 | 208 return fl; |
209 } else { | |
210 fl = _free_list; | |
211 } | |
212 } | |
213 assert(fl == NULL, "Loop condition."); | |
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214 return new PerRegionTable(hr); |
342 | 215 } |
216 | |
6253 | 217 PerRegionTable* next() const { return _next; } |
218 void set_next(PerRegionTable* next) { _next = next; } | |
219 PerRegionTable* prev() const { return _prev; } | |
220 void set_prev(PerRegionTable* prev) { _prev = prev; } | |
221 | |
222 // Accessor and Modification routines for the pointer for the | |
223 // singly linked collision list that links the PRTs within the | |
224 // OtherRegionsTable::_fine_grain_regions hash table. | |
225 // | |
226 // It might be useful to also make the collision list doubly linked | |
227 // to avoid iteration over the collisions list during scrubbing/deletion. | |
228 // OTOH there might not be many collisions. | |
229 | |
230 PerRegionTable* collision_list_next() const { | |
231 return _collision_list_next; | |
232 } | |
233 | |
234 void set_collision_list_next(PerRegionTable* next) { | |
235 _collision_list_next = next; | |
236 } | |
237 | |
238 PerRegionTable** collision_list_next_addr() { | |
239 return &_collision_list_next; | |
240 } | |
241 | |
342 | 242 static size_t fl_mem_size() { |
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243 PerRegionTable* cur = _free_list; |
342 | 244 size_t res = 0; |
245 while (cur != NULL) { | |
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246 res += cur->mem_size(); |
342 | 247 cur = cur->next(); |
248 } | |
249 return res; | |
250 } | |
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251 |
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252 static void test_fl_mem_size(); |
342 | 253 }; |
254 | |
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255 PerRegionTable* PerRegionTable::_free_list = NULL; |
342 | 256 |
257 size_t OtherRegionsTable::_max_fine_entries = 0; | |
258 size_t OtherRegionsTable::_mod_max_fine_entries_mask = 0; | |
259 size_t OtherRegionsTable::_fine_eviction_stride = 0; | |
260 size_t OtherRegionsTable::_fine_eviction_sample_size = 0; | |
261 | |
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262 OtherRegionsTable::OtherRegionsTable(HeapRegion* hr, Mutex* m) : |
342 | 263 _g1h(G1CollectedHeap::heap()), |
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264 _hr(hr), _m(m), |
342 | 265 _coarse_map(G1CollectedHeap::heap()->max_regions(), |
266 false /* in-resource-area */), | |
267 _fine_grain_regions(NULL), | |
6253 | 268 _first_all_fine_prts(NULL), _last_all_fine_prts(NULL), |
342 | 269 _n_fine_entries(0), _n_coarse_entries(0), |
270 _fine_eviction_start(0), | |
271 _sparse_table(hr) | |
272 { | |
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273 typedef PerRegionTable* PerRegionTablePtr; |
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274 |
342 | 275 if (_max_fine_entries == 0) { |
276 assert(_mod_max_fine_entries_mask == 0, "Both or none."); | |
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277 size_t max_entries_log = (size_t)log2_long((jlong)G1RSetRegionEntries); |
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278 _max_fine_entries = (size_t)1 << max_entries_log; |
342 | 279 _mod_max_fine_entries_mask = _max_fine_entries - 1; |
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280 |
342 | 281 assert(_fine_eviction_sample_size == 0 |
282 && _fine_eviction_stride == 0, "All init at same time."); | |
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283 _fine_eviction_sample_size = MAX2((size_t)4, max_entries_log); |
342 | 284 _fine_eviction_stride = _max_fine_entries / _fine_eviction_sample_size; |
285 } | |
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286 |
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287 _fine_grain_regions = NEW_C_HEAP_ARRAY3(PerRegionTablePtr, _max_fine_entries, |
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288 mtGC, 0, AllocFailStrategy::RETURN_NULL); |
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289 |
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290 if (_fine_grain_regions == NULL) { |
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291 vm_exit_out_of_memory(sizeof(void*)*_max_fine_entries, OOM_MALLOC_ERROR, |
342 | 292 "Failed to allocate _fine_grain_entries."); |
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293 } |
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294 |
342 | 295 for (size_t i = 0; i < _max_fine_entries; i++) { |
296 _fine_grain_regions[i] = NULL; | |
297 } | |
298 } | |
299 | |
6253 | 300 void OtherRegionsTable::link_to_all(PerRegionTable* prt) { |
301 // We always append to the beginning of the list for convenience; | |
302 // the order of entries in this list does not matter. | |
303 if (_first_all_fine_prts != NULL) { | |
304 assert(_first_all_fine_prts->prev() == NULL, "invariant"); | |
305 _first_all_fine_prts->set_prev(prt); | |
306 prt->set_next(_first_all_fine_prts); | |
307 } else { | |
308 // this is the first element we insert. Adjust the "last" pointer | |
309 _last_all_fine_prts = prt; | |
310 assert(prt->next() == NULL, "just checking"); | |
311 } | |
312 // the new element is always the first element without a predecessor | |
313 prt->set_prev(NULL); | |
314 _first_all_fine_prts = prt; | |
315 | |
316 assert(prt->prev() == NULL, "just checking"); | |
317 assert(_first_all_fine_prts == prt, "just checking"); | |
318 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || | |
319 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), | |
320 "just checking"); | |
321 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, | |
322 "just checking"); | |
323 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, | |
324 "just checking"); | |
325 } | |
326 | |
327 void OtherRegionsTable::unlink_from_all(PerRegionTable* prt) { | |
328 if (prt->prev() != NULL) { | |
329 assert(_first_all_fine_prts != prt, "just checking"); | |
330 prt->prev()->set_next(prt->next()); | |
331 // removing the last element in the list? | |
332 if (_last_all_fine_prts == prt) { | |
333 _last_all_fine_prts = prt->prev(); | |
334 } | |
335 } else { | |
336 assert(_first_all_fine_prts == prt, "just checking"); | |
337 _first_all_fine_prts = prt->next(); | |
338 // list is empty now? | |
339 if (_first_all_fine_prts == NULL) { | |
340 _last_all_fine_prts = NULL; | |
341 } | |
342 } | |
343 | |
344 if (prt->next() != NULL) { | |
345 prt->next()->set_prev(prt->prev()); | |
346 } | |
347 | |
348 prt->set_next(NULL); | |
349 prt->set_prev(NULL); | |
350 | |
351 assert((_first_all_fine_prts == NULL && _last_all_fine_prts == NULL) || | |
352 (_first_all_fine_prts != NULL && _last_all_fine_prts != NULL), | |
353 "just checking"); | |
354 assert(_last_all_fine_prts == NULL || _last_all_fine_prts->next() == NULL, | |
355 "just checking"); | |
356 assert(_first_all_fine_prts == NULL || _first_all_fine_prts->prev() == NULL, | |
357 "just checking"); | |
358 } | |
359 | |
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360 int** OtherRegionsTable::_from_card_cache = NULL; |
342 | 361 size_t OtherRegionsTable::_from_card_cache_max_regions = 0; |
362 size_t OtherRegionsTable::_from_card_cache_mem_size = 0; | |
363 | |
364 void OtherRegionsTable::init_from_card_cache(size_t max_regions) { | |
365 _from_card_cache_max_regions = max_regions; | |
366 | |
367 int n_par_rs = HeapRegionRemSet::num_par_rem_sets(); | |
6197 | 368 _from_card_cache = NEW_C_HEAP_ARRAY(int*, n_par_rs, mtGC); |
342 | 369 for (int i = 0; i < n_par_rs; i++) { |
6197 | 370 _from_card_cache[i] = NEW_C_HEAP_ARRAY(int, max_regions, mtGC); |
342 | 371 for (size_t j = 0; j < max_regions; j++) { |
372 _from_card_cache[i][j] = -1; // An invalid value. | |
373 } | |
374 } | |
375 _from_card_cache_mem_size = n_par_rs * max_regions * sizeof(int); | |
376 } | |
377 | |
378 void OtherRegionsTable::shrink_from_card_cache(size_t new_n_regs) { | |
379 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
380 assert(new_n_regs <= _from_card_cache_max_regions, "Must be within max."); | |
381 for (size_t j = new_n_regs; j < _from_card_cache_max_regions; j++) { | |
382 _from_card_cache[i][j] = -1; // An invalid value. | |
383 } | |
384 } | |
385 } | |
386 | |
387 #ifndef PRODUCT | |
388 void OtherRegionsTable::print_from_card_cache() { | |
389 for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets(); i++) { | |
390 for (size_t j = 0; j < _from_card_cache_max_regions; j++) { | |
391 gclog_or_tty->print_cr("_from_card_cache[%d][%d] = %d.", | |
392 i, j, _from_card_cache[i][j]); | |
393 } | |
394 } | |
395 } | |
396 #endif | |
397 | |
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398 void OtherRegionsTable::add_reference(OopOrNarrowOopStar from, int tid) { |
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399 size_t cur_hrs_ind = (size_t) hr()->hrs_index(); |
342 | 400 |
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401 if (G1TraceHeapRegionRememberedSet) { |
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402 gclog_or_tty->print_cr("ORT::add_reference_work(" PTR_FORMAT "->" PTR_FORMAT ").", |
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403 from, |
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404 UseCompressedOops |
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405 ? (void *)oopDesc::load_decode_heap_oop((narrowOop*)from) |
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406 : (void *)oopDesc::load_decode_heap_oop((oop*)from)); |
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407 } |
342 | 408 |
409 int from_card = (int)(uintptr_t(from) >> CardTableModRefBS::card_shift); | |
410 | |
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411 if (G1TraceHeapRegionRememberedSet) { |
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412 gclog_or_tty->print_cr("Table for [" PTR_FORMAT "...): card %d (cache = %d)", |
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413 hr()->bottom(), from_card, |
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414 _from_card_cache[tid][cur_hrs_ind]); |
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415 } |
342 | 416 |
417 if (from_card == _from_card_cache[tid][cur_hrs_ind]) { | |
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418 if (G1TraceHeapRegionRememberedSet) { |
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419 gclog_or_tty->print_cr(" from-card cache hit."); |
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420 } |
342 | 421 assert(contains_reference(from), "We just added it!"); |
422 return; | |
423 } else { | |
424 _from_card_cache[tid][cur_hrs_ind] = from_card; | |
425 } | |
426 | |
427 // Note that this may be a continued H region. | |
428 HeapRegion* from_hr = _g1h->heap_region_containing_raw(from); | |
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429 RegionIdx_t from_hrs_ind = (RegionIdx_t) from_hr->hrs_index(); |
342 | 430 |
431 // If the region is already coarsened, return. | |
432 if (_coarse_map.at(from_hrs_ind)) { | |
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433 if (G1TraceHeapRegionRememberedSet) { |
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434 gclog_or_tty->print_cr(" coarse map hit."); |
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435 } |
342 | 436 assert(contains_reference(from), "We just added it!"); |
437 return; | |
438 } | |
439 | |
440 // Otherwise find a per-region table to add it to. | |
441 size_t ind = from_hrs_ind & _mod_max_fine_entries_mask; | |
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442 PerRegionTable* prt = find_region_table(ind, from_hr); |
342 | 443 if (prt == NULL) { |
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444 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); |
342 | 445 // Confirm that it's really not there... |
446 prt = find_region_table(ind, from_hr); | |
447 if (prt == NULL) { | |
448 | |
449 uintptr_t from_hr_bot_card_index = | |
450 uintptr_t(from_hr->bottom()) | |
451 >> CardTableModRefBS::card_shift; | |
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452 CardIdx_t card_index = from_card - from_hr_bot_card_index; |
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453 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
342 | 454 "Must be in range."); |
455 if (G1HRRSUseSparseTable && | |
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456 _sparse_table.add_card(from_hrs_ind, card_index)) { |
342 | 457 if (G1RecordHRRSOops) { |
458 HeapRegionRemSet::record(hr(), from); | |
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459 if (G1TraceHeapRegionRememberedSet) { |
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460 gclog_or_tty->print(" Added card " PTR_FORMAT " to region " |
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461 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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462 align_size_down(uintptr_t(from), |
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463 CardTableModRefBS::card_size), |
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464 hr()->bottom(), from); |
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465 } |
342 | 466 } |
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467 if (G1TraceHeapRegionRememberedSet) { |
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468 gclog_or_tty->print_cr(" added card to sparse table."); |
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469 } |
342 | 470 assert(contains_reference_locked(from), "We just added it!"); |
471 return; | |
472 } else { | |
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473 if (G1TraceHeapRegionRememberedSet) { |
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474 gclog_or_tty->print_cr(" [tid %d] sparse table entry " |
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475 "overflow(f: %d, t: %d)", |
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476 tid, from_hrs_ind, cur_hrs_ind); |
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477 } |
342 | 478 } |
479 | |
480 if (_n_fine_entries == _max_fine_entries) { | |
481 prt = delete_region_table(); | |
6253 | 482 // There is no need to clear the links to the 'all' list here: |
483 // prt will be reused immediately, i.e. remain in the 'all' list. | |
484 prt->init(from_hr, false /* clear_links_to_all_list */); | |
342 | 485 } else { |
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486 prt = PerRegionTable::alloc(from_hr); |
6253 | 487 link_to_all(prt); |
342 | 488 } |
489 | |
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490 PerRegionTable* first_prt = _fine_grain_regions[ind]; |
6253 | 491 prt->set_collision_list_next(first_prt); |
342 | 492 _fine_grain_regions[ind] = prt; |
493 _n_fine_entries++; | |
494 | |
495 if (G1HRRSUseSparseTable) { | |
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496 // Transfer from sparse to fine-grain. |
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497 SparsePRTEntry *sprt_entry = _sparse_table.get_entry(from_hrs_ind); |
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498 assert(sprt_entry != NULL, "There should have been an entry"); |
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499 for (int i = 0; i < SparsePRTEntry::cards_num(); i++) { |
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500 CardIdx_t c = sprt_entry->card(i); |
342 | 501 if (c != SparsePRTEntry::NullEntry) { |
502 prt->add_card(c); | |
503 } | |
504 } | |
505 // Now we can delete the sparse entry. | |
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506 bool res = _sparse_table.delete_entry(from_hrs_ind); |
342 | 507 assert(res, "It should have been there."); |
508 } | |
509 } | |
510 assert(prt != NULL && prt->hr() == from_hr, "consequence"); | |
511 } | |
512 // Note that we can't assert "prt->hr() == from_hr", because of the | |
513 // possibility of concurrent reuse. But see head comment of | |
514 // OtherRegionsTable for why this is OK. | |
515 assert(prt != NULL, "Inv"); | |
516 | |
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517 prt->add_reference(from); |
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518 |
342 | 519 if (G1RecordHRRSOops) { |
520 HeapRegionRemSet::record(hr(), from); | |
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521 if (G1TraceHeapRegionRememberedSet) { |
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522 gclog_or_tty->print("Added card " PTR_FORMAT " to region " |
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523 "[" PTR_FORMAT "...) for ref " PTR_FORMAT ".\n", |
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524 align_size_down(uintptr_t(from), |
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525 CardTableModRefBS::card_size), |
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526 hr()->bottom(), from); |
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527 } |
342 | 528 } |
529 assert(contains_reference(from), "We just added it!"); | |
530 } | |
531 | |
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532 PerRegionTable* |
342 | 533 OtherRegionsTable::find_region_table(size_t ind, HeapRegion* hr) const { |
534 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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535 PerRegionTable* prt = _fine_grain_regions[ind]; |
342 | 536 while (prt != NULL && prt->hr() != hr) { |
6253 | 537 prt = prt->collision_list_next(); |
342 | 538 } |
539 // Loop postcondition is the method postcondition. | |
540 return prt; | |
541 } | |
542 | |
543 jint OtherRegionsTable::_n_coarsenings = 0; | |
544 | |
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545 PerRegionTable* OtherRegionsTable::delete_region_table() { |
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546 assert(_m->owned_by_self(), "Precondition"); |
342 | 547 assert(_n_fine_entries == _max_fine_entries, "Precondition"); |
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548 PerRegionTable* max = NULL; |
342 | 549 jint max_occ = 0; |
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550 PerRegionTable** max_prev; |
342 | 551 size_t max_ind; |
552 | |
553 size_t i = _fine_eviction_start; | |
554 for (size_t k = 0; k < _fine_eviction_sample_size; k++) { | |
555 size_t ii = i; | |
556 // Make sure we get a non-NULL sample. | |
557 while (_fine_grain_regions[ii] == NULL) { | |
558 ii++; | |
559 if (ii == _max_fine_entries) ii = 0; | |
560 guarantee(ii != i, "We must find one."); | |
561 } | |
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562 PerRegionTable** prev = &_fine_grain_regions[ii]; |
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563 PerRegionTable* cur = *prev; |
342 | 564 while (cur != NULL) { |
565 jint cur_occ = cur->occupied(); | |
566 if (max == NULL || cur_occ > max_occ) { | |
567 max = cur; | |
568 max_prev = prev; | |
569 max_ind = i; | |
570 max_occ = cur_occ; | |
571 } | |
6253 | 572 prev = cur->collision_list_next_addr(); |
573 cur = cur->collision_list_next(); | |
342 | 574 } |
575 i = i + _fine_eviction_stride; | |
576 if (i >= _n_fine_entries) i = i - _n_fine_entries; | |
577 } | |
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578 |
342 | 579 _fine_eviction_start++; |
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580 |
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581 if (_fine_eviction_start >= _n_fine_entries) { |
342 | 582 _fine_eviction_start -= _n_fine_entries; |
583 } | |
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584 |
342 | 585 guarantee(max != NULL, "Since _n_fine_entries > 0"); |
586 | |
587 // Set the corresponding coarse bit. | |
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588 size_t max_hrs_index = (size_t) max->hr()->hrs_index(); |
342 | 589 if (!_coarse_map.at(max_hrs_index)) { |
590 _coarse_map.at_put(max_hrs_index, true); | |
591 _n_coarse_entries++; | |
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592 if (G1TraceHeapRegionRememberedSet) { |
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593 gclog_or_tty->print("Coarsened entry in region [" PTR_FORMAT "...] " |
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594 "for region [" PTR_FORMAT "...] (%d coarse entries).\n", |
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595 hr()->bottom(), |
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596 max->hr()->bottom(), |
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597 _n_coarse_entries); |
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598 } |
342 | 599 } |
600 | |
601 // Unsplice. | |
6253 | 602 *max_prev = max->collision_list_next(); |
342 | 603 Atomic::inc(&_n_coarsenings); |
604 _n_fine_entries--; | |
605 return max; | |
606 } | |
607 | |
608 | |
609 // At present, this must be called stop-world single-threaded. | |
610 void OtherRegionsTable::scrub(CardTableModRefBS* ctbs, | |
611 BitMap* region_bm, BitMap* card_bm) { | |
612 // First eliminated garbage regions from the coarse map. | |
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613 if (G1RSScrubVerbose) { |
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614 gclog_or_tty->print_cr("Scrubbing region %u:", hr()->hrs_index()); |
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615 } |
342 | 616 |
617 assert(_coarse_map.size() == region_bm->size(), "Precondition"); | |
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618 if (G1RSScrubVerbose) { |
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619 gclog_or_tty->print(" Coarse map: before = "SIZE_FORMAT"...", |
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620 _n_coarse_entries); |
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621 } |
342 | 622 _coarse_map.set_intersection(*region_bm); |
623 _n_coarse_entries = _coarse_map.count_one_bits(); | |
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624 if (G1RSScrubVerbose) { |
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625 gclog_or_tty->print_cr(" after = "SIZE_FORMAT".", _n_coarse_entries); |
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626 } |
342 | 627 |
628 // Now do the fine-grained maps. | |
629 for (size_t i = 0; i < _max_fine_entries; i++) { | |
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630 PerRegionTable* cur = _fine_grain_regions[i]; |
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631 PerRegionTable** prev = &_fine_grain_regions[i]; |
342 | 632 while (cur != NULL) { |
6253 | 633 PerRegionTable* nxt = cur->collision_list_next(); |
342 | 634 // If the entire region is dead, eliminate. |
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635 if (G1RSScrubVerbose) { |
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636 gclog_or_tty->print_cr(" For other region %u:", |
3766 | 637 cur->hr()->hrs_index()); |
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638 } |
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639 if (!region_bm->at((size_t) cur->hr()->hrs_index())) { |
342 | 640 *prev = nxt; |
6253 | 641 cur->set_collision_list_next(NULL); |
342 | 642 _n_fine_entries--; |
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643 if (G1RSScrubVerbose) { |
342 | 644 gclog_or_tty->print_cr(" deleted via region map."); |
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645 } |
6253 | 646 unlink_from_all(cur); |
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647 PerRegionTable::free(cur); |
342 | 648 } else { |
649 // Do fine-grain elimination. | |
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650 if (G1RSScrubVerbose) { |
342 | 651 gclog_or_tty->print(" occ: before = %4d.", cur->occupied()); |
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652 } |
342 | 653 cur->scrub(ctbs, card_bm); |
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654 if (G1RSScrubVerbose) { |
342 | 655 gclog_or_tty->print_cr(" after = %4d.", cur->occupied()); |
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656 } |
342 | 657 // Did that empty the table completely? |
658 if (cur->occupied() == 0) { | |
659 *prev = nxt; | |
6253 | 660 cur->set_collision_list_next(NULL); |
342 | 661 _n_fine_entries--; |
6253 | 662 unlink_from_all(cur); |
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663 PerRegionTable::free(cur); |
342 | 664 } else { |
6253 | 665 prev = cur->collision_list_next_addr(); |
342 | 666 } |
667 } | |
668 cur = nxt; | |
669 } | |
670 } | |
671 // Since we may have deleted a from_card_cache entry from the RS, clear | |
672 // the FCC. | |
673 clear_fcc(); | |
674 } | |
675 | |
676 | |
677 size_t OtherRegionsTable::occupied() const { | |
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 size_t sum = 0; | |
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708 // all PRTs are of the same size so it is sufficient to query only one of them. |
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709 if (_first_all_fine_prts != NULL) { |
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710 assert(_last_all_fine_prts != NULL && |
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711 _first_all_fine_prts->mem_size() == _last_all_fine_prts->mem_size(), "check that mem_size() is constant"); |
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712 sum += _first_all_fine_prts->mem_size() * _n_fine_entries; |
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() { | |
6253 | 737 // if there are no entries, skip this step |
738 if (_first_all_fine_prts != NULL) { | |
739 guarantee(_first_all_fine_prts != NULL && _last_all_fine_prts != NULL, "just checking"); | |
740 PerRegionTable::bulk_free(_first_all_fine_prts, _last_all_fine_prts); | |
741 memset(_fine_grain_regions, 0, _max_fine_entries * sizeof(_fine_grain_regions[0])); | |
742 } else { | |
743 guarantee(_first_all_fine_prts == NULL && _last_all_fine_prts == NULL, "just checking"); | |
342 | 744 } |
6253 | 745 |
746 _first_all_fine_prts = _last_all_fine_prts = NULL; | |
342 | 747 _sparse_table.clear(); |
748 _coarse_map.clear(); | |
749 _n_fine_entries = 0; | |
750 _n_coarse_entries = 0; | |
751 | |
752 clear_fcc(); | |
753 } | |
754 | |
755 void OtherRegionsTable::clear_incoming_entry(HeapRegion* from_hr) { | |
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756 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); |
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757 size_t hrs_ind = (size_t) from_hr->hrs_index(); |
342 | 758 size_t ind = hrs_ind & _mod_max_fine_entries_mask; |
759 if (del_single_region_table(ind, from_hr)) { | |
760 assert(!_coarse_map.at(hrs_ind), "Inv"); | |
761 } else { | |
762 _coarse_map.par_at_put(hrs_ind, 0); | |
763 } | |
764 // Check to see if any of the fcc entries come from here. | |
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765 size_t hr_ind = (size_t) hr()->hrs_index(); |
342 | 766 for (int tid = 0; tid < HeapRegionRemSet::num_par_rem_sets(); tid++) { |
767 int fcc_ent = _from_card_cache[tid][hr_ind]; | |
768 if (fcc_ent != -1) { | |
769 HeapWord* card_addr = (HeapWord*) | |
770 (uintptr_t(fcc_ent) << CardTableModRefBS::card_shift); | |
771 if (hr()->is_in_reserved(card_addr)) { | |
772 // Clear the from card cache. | |
773 _from_card_cache[tid][hr_ind] = -1; | |
774 } | |
775 } | |
776 } | |
777 } | |
778 | |
779 bool OtherRegionsTable::del_single_region_table(size_t ind, | |
780 HeapRegion* hr) { | |
781 assert(0 <= ind && ind < _max_fine_entries, "Preconditions."); | |
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782 PerRegionTable** prev_addr = &_fine_grain_regions[ind]; |
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783 PerRegionTable* prt = *prev_addr; |
342 | 784 while (prt != NULL && prt->hr() != hr) { |
6253 | 785 prev_addr = prt->collision_list_next_addr(); |
786 prt = prt->collision_list_next(); | |
342 | 787 } |
788 if (prt != NULL) { | |
789 assert(prt->hr() == hr, "Loop postcondition."); | |
6253 | 790 *prev_addr = prt->collision_list_next(); |
791 unlink_from_all(prt); | |
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792 PerRegionTable::free(prt); |
342 | 793 _n_fine_entries--; |
794 return true; | |
795 } else { | |
796 return false; | |
797 } | |
798 } | |
799 | |
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800 bool OtherRegionsTable::contains_reference(OopOrNarrowOopStar from) const { |
342 | 801 // Cast away const in this case. |
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802 MutexLockerEx x((Mutex*)_m, Mutex::_no_safepoint_check_flag); |
342 | 803 return contains_reference_locked(from); |
804 } | |
805 | |
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806 bool OtherRegionsTable::contains_reference_locked(OopOrNarrowOopStar from) const { |
342 | 807 HeapRegion* hr = _g1h->heap_region_containing_raw(from); |
808 if (hr == NULL) return false; | |
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809 RegionIdx_t hr_ind = (RegionIdx_t) hr->hrs_index(); |
342 | 810 // Is this region in the coarse map? |
811 if (_coarse_map.at(hr_ind)) return true; | |
812 | |
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813 PerRegionTable* prt = find_region_table(hr_ind & _mod_max_fine_entries_mask, |
342 | 814 hr); |
815 if (prt != NULL) { | |
816 return prt->contains_reference(from); | |
817 | |
818 } else { | |
819 uintptr_t from_card = | |
820 (uintptr_t(from) >> CardTableModRefBS::card_shift); | |
821 uintptr_t hr_bot_card_index = | |
822 uintptr_t(hr->bottom()) >> CardTableModRefBS::card_shift; | |
823 assert(from_card >= hr_bot_card_index, "Inv"); | |
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824 CardIdx_t card_index = from_card - hr_bot_card_index; |
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825 assert(0 <= card_index && (size_t)card_index < HeapRegion::CardsPerRegion, |
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826 "Must be in range."); |
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827 return _sparse_table.contains_card(hr_ind, card_index); |
342 | 828 } |
829 | |
830 | |
831 } | |
832 | |
2173 | 833 void |
834 OtherRegionsTable::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
835 _sparse_table.do_cleanup_work(hrrs_cleanup_task); | |
836 } | |
837 | |
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838 // Determines how many threads can add records to an rset in parallel. |
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839 // This can be done by either mutator threads together with the |
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840 // concurrent refinement threads or GC threads. |
342 | 841 int HeapRegionRemSet::num_par_rem_sets() { |
795
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842 return (int)MAX2(DirtyCardQueueSet::num_par_ids() + ConcurrentG1Refine::thread_num(), ParallelGCThreads); |
342 | 843 } |
844 | |
845 HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, | |
846 HeapRegion* hr) | |
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847 : _bosa(bosa), |
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848 _m(Mutex::leaf, FormatBuffer<128>("HeapRegionRemSet lock #"UINT32_FORMAT, hr->hrs_index()), true), |
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849 _code_roots(), _other_regions(hr, &_m) { |
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850 reset_for_par_iteration(); |
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851 } |
342 | 852 |
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853 void HeapRegionRemSet::setup_remset_size() { |
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854 // Setup sparse and fine-grain tables sizes. |
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855 // table_size = base * (log(region_size / 1M) + 1) |
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856 const int LOG_M = 20; |
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857 int region_size_log_mb = MAX2(HeapRegion::LogOfHRGrainBytes - LOG_M, 0); |
1261
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858 if (FLAG_IS_DEFAULT(G1RSetSparseRegionEntries)) { |
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859 G1RSetSparseRegionEntries = G1RSetSparseRegionEntriesBase * (region_size_log_mb + 1); |
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860 } |
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861 if (FLAG_IS_DEFAULT(G1RSetRegionEntries)) { |
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862 G1RSetRegionEntries = G1RSetRegionEntriesBase * (region_size_log_mb + 1); |
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863 } |
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864 guarantee(G1RSetSparseRegionEntries > 0 && G1RSetRegionEntries > 0 , "Sanity"); |
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865 } |
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866 |
342 | 867 bool HeapRegionRemSet::claim_iter() { |
868 if (_iter_state != Unclaimed) return false; | |
869 jint res = Atomic::cmpxchg(Claimed, (jint*)(&_iter_state), Unclaimed); | |
870 return (res == Unclaimed); | |
871 } | |
872 | |
873 void HeapRegionRemSet::set_iter_complete() { | |
874 _iter_state = Complete; | |
875 } | |
876 | |
877 bool HeapRegionRemSet::iter_is_complete() { | |
878 return _iter_state == Complete; | |
879 } | |
880 | |
881 #ifndef PRODUCT | |
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882 void HeapRegionRemSet::print() { |
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883 HeapRegionRemSetIterator iter(this); |
342 | 884 size_t card_index; |
885 while (iter.has_next(card_index)) { | |
886 HeapWord* card_start = | |
887 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
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888 gclog_or_tty->print_cr(" Card " PTR_FORMAT, card_start); |
342 | 889 } |
890 if (iter.n_yielded() != occupied()) { | |
891 gclog_or_tty->print_cr("Yielded disagrees with occupied:"); | |
892 gclog_or_tty->print_cr(" %6d yielded (%6d coarse, %6d fine).", | |
893 iter.n_yielded(), | |
894 iter.n_yielded_coarse(), iter.n_yielded_fine()); | |
895 gclog_or_tty->print_cr(" %6d occ (%6d coarse, %6d fine).", | |
896 occupied(), occ_coarse(), occ_fine()); | |
897 } | |
898 guarantee(iter.n_yielded() == occupied(), | |
899 "We should have yielded all the represented cards."); | |
900 } | |
901 #endif | |
902 | |
903 void HeapRegionRemSet::cleanup() { | |
904 SparsePRT::cleanup_all(); | |
905 } | |
906 | |
907 void HeapRegionRemSet::clear() { | |
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908 MutexLockerEx x(&_m, Mutex::_no_safepoint_check_flag); |
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909 clear_locked(); |
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910 } |
12080 | 911 |
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912 void HeapRegionRemSet::clear_locked() { |
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913 _code_roots.clear(); |
342 | 914 _other_regions.clear(); |
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915 assert(occupied_locked() == 0, "Should be clear."); |
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916 reset_for_par_iteration(); |
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917 } |
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918 |
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919 void HeapRegionRemSet::reset_for_par_iteration() { |
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920 _iter_state = Unclaimed; |
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921 _iter_claimed = 0; |
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922 // It's good to check this to make sure that the two methods are in sync. |
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923 assert(verify_ready_for_par_iteration(), "post-condition"); |
342 | 924 } |
925 | |
926 void HeapRegionRemSet::scrub(CardTableModRefBS* ctbs, | |
927 BitMap* region_bm, BitMap* card_bm) { | |
928 _other_regions.scrub(ctbs, region_bm, card_bm); | |
929 } | |
930 | |
12080 | 931 |
932 // Code roots support | |
933 | |
934 void HeapRegionRemSet::add_strong_code_root(nmethod* nm) { | |
935 assert(nm != NULL, "sanity"); | |
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936 _code_roots.add(nm); |
12080 | 937 } |
938 | |
939 void HeapRegionRemSet::remove_strong_code_root(nmethod* nm) { | |
940 assert(nm != NULL, "sanity"); | |
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941 _code_roots.remove(nm); |
12080 | 942 // Check that there were no duplicates |
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943 guarantee(!_code_roots.contains(nm), "duplicate entry found"); |
12080 | 944 } |
945 | |
946 class NMethodMigrationOopClosure : public OopClosure { | |
947 G1CollectedHeap* _g1h; | |
948 HeapRegion* _from; | |
949 nmethod* _nm; | |
950 | |
951 uint _num_self_forwarded; | |
952 | |
953 template <class T> void do_oop_work(T* p) { | |
954 T heap_oop = oopDesc::load_heap_oop(p); | |
955 if (!oopDesc::is_null(heap_oop)) { | |
956 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); | |
957 if (_from->is_in(obj)) { | |
958 // Reference still points into the source region. | |
959 // Since roots are immediately evacuated this means that | |
960 // we must have self forwarded the object | |
961 assert(obj->is_forwarded(), | |
962 err_msg("code roots should be immediately evacuated. " | |
963 "Ref: "PTR_FORMAT", " | |
964 "Obj: "PTR_FORMAT", " | |
965 "Region: "HR_FORMAT, | |
966 p, (void*) obj, HR_FORMAT_PARAMS(_from))); | |
967 assert(obj->forwardee() == obj, | |
968 err_msg("not self forwarded? obj = "PTR_FORMAT, (void*)obj)); | |
969 | |
970 // The object has been self forwarded. | |
971 // Note, if we're during an initial mark pause, there is | |
972 // no need to explicitly mark object. It will be marked | |
973 // during the regular evacuation failure handling code. | |
974 _num_self_forwarded++; | |
975 } else { | |
976 // The reference points into a promotion or to-space region | |
977 HeapRegion* to = _g1h->heap_region_containing(obj); | |
978 to->rem_set()->add_strong_code_root(_nm); | |
979 } | |
980 } | |
981 } | |
982 | |
983 public: | |
984 NMethodMigrationOopClosure(G1CollectedHeap* g1h, HeapRegion* from, nmethod* nm): | |
985 _g1h(g1h), _from(from), _nm(nm), _num_self_forwarded(0) {} | |
986 | |
987 void do_oop(narrowOop* p) { do_oop_work(p); } | |
988 void do_oop(oop* p) { do_oop_work(p); } | |
989 | |
990 uint retain() { return _num_self_forwarded > 0; } | |
991 }; | |
992 | |
993 void HeapRegionRemSet::migrate_strong_code_roots() { | |
994 assert(hr()->in_collection_set(), "only collection set regions"); | |
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995 assert(!hr()->isHumongous(), |
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996 err_msg("humongous region "HR_FORMAT" should not have been added to the collection set", |
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997 HR_FORMAT_PARAMS(hr()))); |
12080 | 998 |
999 ResourceMark rm; | |
1000 | |
1001 // List of code blobs to retain for this region | |
1002 GrowableArray<nmethod*> to_be_retained(10); | |
1003 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1004 | |
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1005 while (!_code_roots.is_empty()) { |
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1006 nmethod *nm = _code_roots.pop(); |
12080 | 1007 if (nm != NULL) { |
1008 NMethodMigrationOopClosure oop_cl(g1h, hr(), nm); | |
1009 nm->oops_do(&oop_cl); | |
1010 if (oop_cl.retain()) { | |
1011 to_be_retained.push(nm); | |
1012 } | |
1013 } | |
1014 } | |
1015 | |
1016 // Now push any code roots we need to retain | |
1017 assert(to_be_retained.is_empty() || hr()->evacuation_failed(), | |
1018 "Retained nmethod list must be empty or " | |
1019 "evacuation of this region failed"); | |
1020 | |
1021 while (to_be_retained.is_nonempty()) { | |
1022 nmethod* nm = to_be_retained.pop(); | |
1023 assert(nm != NULL, "sanity"); | |
1024 add_strong_code_root(nm); | |
1025 } | |
1026 } | |
1027 | |
1028 void HeapRegionRemSet::strong_code_roots_do(CodeBlobClosure* blk) const { | |
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1029 _code_roots.nmethods_do(blk); |
12080 | 1030 } |
1031 | |
1032 size_t HeapRegionRemSet::strong_code_roots_mem_size() { | |
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1033 return _code_roots.mem_size(); |
12080 | 1034 } |
1035 | |
342 | 1036 //-------------------- Iteration -------------------- |
1037 | |
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1038 HeapRegionRemSetIterator:: HeapRegionRemSetIterator(HeapRegionRemSet* hrrs) : |
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1039 _hrrs(hrrs), |
342 | 1040 _g1h(G1CollectedHeap::heap()), |
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1041 _coarse_map(&hrrs->_other_regions._coarse_map), |
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1042 _fine_grain_regions(hrrs->_other_regions._fine_grain_regions), |
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1043 _bosa(hrrs->bosa()), |
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1044 _is(Sparse), |
342 | 1045 // Set these values so that we increment to the first region. |
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1046 _coarse_cur_region_index(-1), |
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1047 _coarse_cur_region_cur_card(HeapRegion::CardsPerRegion-1), |
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1048 _cur_region_cur_card(0), |
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1049 _fine_array_index(-1), |
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1050 _fine_cur_prt(NULL), |
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1051 _n_yielded_coarse(0), |
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1052 _n_yielded_fine(0), |
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1053 _n_yielded_sparse(0), |
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1054 _sparse_iter(&hrrs->_other_regions._sparse_table) {} |
342 | 1055 |
1056 bool HeapRegionRemSetIterator::coarse_has_next(size_t& card_index) { | |
1057 if (_hrrs->_other_regions._n_coarse_entries == 0) return false; | |
1058 // Go to the next card. | |
1059 _coarse_cur_region_cur_card++; | |
1060 // Was the last the last card in the current region? | |
942
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1061 if (_coarse_cur_region_cur_card == HeapRegion::CardsPerRegion) { |
342 | 1062 // Yes: find the next region. This may leave _coarse_cur_region_index |
1063 // Set to the last index, in which case there are no more coarse | |
1064 // regions. | |
1065 _coarse_cur_region_index = | |
1066 (int) _coarse_map->get_next_one_offset(_coarse_cur_region_index + 1); | |
1067 if ((size_t)_coarse_cur_region_index < _coarse_map->size()) { | |
1068 _coarse_cur_region_cur_card = 0; | |
1069 HeapWord* r_bot = | |
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1070 _g1h->region_at((uint) _coarse_cur_region_index)->bottom(); |
342 | 1071 _cur_region_card_offset = _bosa->index_for(r_bot); |
1072 } else { | |
1073 return false; | |
1074 } | |
1075 } | |
1076 // If we didn't return false above, then we can yield a card. | |
1077 card_index = _cur_region_card_offset + _coarse_cur_region_cur_card; | |
1078 return true; | |
1079 } | |
1080 | |
1081 void HeapRegionRemSetIterator::fine_find_next_non_null_prt() { | |
1082 // Otherwise, find the next bucket list in the array. | |
1083 _fine_array_index++; | |
1084 while (_fine_array_index < (int) OtherRegionsTable::_max_fine_entries) { | |
1085 _fine_cur_prt = _fine_grain_regions[_fine_array_index]; | |
1086 if (_fine_cur_prt != NULL) return; | |
1087 else _fine_array_index++; | |
1088 } | |
1089 assert(_fine_cur_prt == NULL, "Loop post"); | |
1090 } | |
1091 | |
1092 bool HeapRegionRemSetIterator::fine_has_next(size_t& card_index) { | |
1093 if (fine_has_next()) { | |
1094 _cur_region_cur_card = | |
1095 _fine_cur_prt->_bm.get_next_one_offset(_cur_region_cur_card + 1); | |
1096 } | |
1097 while (!fine_has_next()) { | |
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1098 if (_cur_region_cur_card == (size_t) HeapRegion::CardsPerRegion) { |
342 | 1099 _cur_region_cur_card = 0; |
6253 | 1100 _fine_cur_prt = _fine_cur_prt->collision_list_next(); |
342 | 1101 } |
1102 if (_fine_cur_prt == NULL) { | |
1103 fine_find_next_non_null_prt(); | |
1104 if (_fine_cur_prt == NULL) return false; | |
1105 } | |
1106 assert(_fine_cur_prt != NULL && _cur_region_cur_card == 0, | |
1107 "inv."); | |
1108 HeapWord* r_bot = | |
1109 _fine_cur_prt->hr()->bottom(); | |
1110 _cur_region_card_offset = _bosa->index_for(r_bot); | |
1111 _cur_region_cur_card = _fine_cur_prt->_bm.get_next_one_offset(0); | |
1112 } | |
1113 assert(fine_has_next(), "Or else we exited the loop via the return."); | |
1114 card_index = _cur_region_card_offset + _cur_region_cur_card; | |
1115 return true; | |
1116 } | |
1117 | |
1118 bool HeapRegionRemSetIterator::fine_has_next() { | |
1119 return | |
1120 _fine_cur_prt != NULL && | |
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1121 _cur_region_cur_card < HeapRegion::CardsPerRegion; |
342 | 1122 } |
1123 | |
1124 bool HeapRegionRemSetIterator::has_next(size_t& card_index) { | |
1125 switch (_is) { | |
1126 case Sparse: | |
1127 if (_sparse_iter.has_next(card_index)) { | |
1128 _n_yielded_sparse++; | |
1129 return true; | |
1130 } | |
1131 // Otherwise, deliberate fall-through | |
1132 _is = Fine; | |
1133 case Fine: | |
1134 if (fine_has_next(card_index)) { | |
1135 _n_yielded_fine++; | |
1136 return true; | |
1137 } | |
1138 // Otherwise, deliberate fall-through | |
1139 _is = Coarse; | |
1140 case Coarse: | |
1141 if (coarse_has_next(card_index)) { | |
1142 _n_yielded_coarse++; | |
1143 return true; | |
1144 } | |
1145 // Otherwise... | |
1146 break; | |
1147 } | |
1148 assert(ParallelGCThreads > 1 || | |
1149 n_yielded() == _hrrs->occupied(), | |
1150 "Should have yielded all the cards in the rem set " | |
1151 "(in the non-par case)."); | |
1152 return false; | |
1153 } | |
1154 | |
1155 | |
1156 | |
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1157 OopOrNarrowOopStar* HeapRegionRemSet::_recorded_oops = NULL; |
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1158 HeapWord** HeapRegionRemSet::_recorded_cards = NULL; |
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1159 HeapRegion** HeapRegionRemSet::_recorded_regions = NULL; |
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1160 int HeapRegionRemSet::_n_recorded = 0; |
342 | 1161 |
1162 HeapRegionRemSet::Event* HeapRegionRemSet::_recorded_events = NULL; | |
1163 int* HeapRegionRemSet::_recorded_event_index = NULL; | |
1164 int HeapRegionRemSet::_n_recorded_events = 0; | |
1165 | |
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1166 void HeapRegionRemSet::record(HeapRegion* hr, OopOrNarrowOopStar f) { |
342 | 1167 if (_recorded_oops == NULL) { |
1168 assert(_n_recorded == 0 | |
1169 && _recorded_cards == NULL | |
1170 && _recorded_regions == NULL, | |
1171 "Inv"); | |
6197 | 1172 _recorded_oops = NEW_C_HEAP_ARRAY(OopOrNarrowOopStar, MaxRecorded, mtGC); |
1173 _recorded_cards = NEW_C_HEAP_ARRAY(HeapWord*, MaxRecorded, mtGC); | |
1174 _recorded_regions = NEW_C_HEAP_ARRAY(HeapRegion*, MaxRecorded, mtGC); | |
342 | 1175 } |
1176 if (_n_recorded == MaxRecorded) { | |
1177 gclog_or_tty->print_cr("Filled up 'recorded' (%d).", MaxRecorded); | |
1178 } else { | |
1179 _recorded_cards[_n_recorded] = | |
1180 (HeapWord*)align_size_down(uintptr_t(f), | |
1181 CardTableModRefBS::card_size); | |
1182 _recorded_oops[_n_recorded] = f; | |
1183 _recorded_regions[_n_recorded] = hr; | |
1184 _n_recorded++; | |
1185 } | |
1186 } | |
1187 | |
1188 void HeapRegionRemSet::record_event(Event evnt) { | |
1189 if (!G1RecordHRRSEvents) return; | |
1190 | |
1191 if (_recorded_events == NULL) { | |
1192 assert(_n_recorded_events == 0 | |
1193 && _recorded_event_index == NULL, | |
1194 "Inv"); | |
6197 | 1195 _recorded_events = NEW_C_HEAP_ARRAY(Event, MaxRecordedEvents, mtGC); |
1196 _recorded_event_index = NEW_C_HEAP_ARRAY(int, MaxRecordedEvents, mtGC); | |
342 | 1197 } |
1198 if (_n_recorded_events == MaxRecordedEvents) { | |
1199 gclog_or_tty->print_cr("Filled up 'recorded_events' (%d).", MaxRecordedEvents); | |
1200 } else { | |
1201 _recorded_events[_n_recorded_events] = evnt; | |
1202 _recorded_event_index[_n_recorded_events] = _n_recorded; | |
1203 _n_recorded_events++; | |
1204 } | |
1205 } | |
1206 | |
1207 void HeapRegionRemSet::print_event(outputStream* str, Event evnt) { | |
1208 switch (evnt) { | |
1209 case Event_EvacStart: | |
1210 str->print("Evac Start"); | |
1211 break; | |
1212 case Event_EvacEnd: | |
1213 str->print("Evac End"); | |
1214 break; | |
1215 case Event_RSUpdateEnd: | |
1216 str->print("RS Update End"); | |
1217 break; | |
1218 } | |
1219 } | |
1220 | |
1221 void HeapRegionRemSet::print_recorded() { | |
1222 int cur_evnt = 0; | |
1223 Event cur_evnt_kind; | |
1224 int cur_evnt_ind = 0; | |
1225 if (_n_recorded_events > 0) { | |
1226 cur_evnt_kind = _recorded_events[cur_evnt]; | |
1227 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
1228 } | |
1229 | |
1230 for (int i = 0; i < _n_recorded; i++) { | |
1231 while (cur_evnt < _n_recorded_events && i == cur_evnt_ind) { | |
1232 gclog_or_tty->print("Event: "); | |
1233 print_event(gclog_or_tty, cur_evnt_kind); | |
1234 gclog_or_tty->print_cr(""); | |
1235 cur_evnt++; | |
1236 if (cur_evnt < MaxRecordedEvents) { | |
1237 cur_evnt_kind = _recorded_events[cur_evnt]; | |
1238 cur_evnt_ind = _recorded_event_index[cur_evnt]; | |
1239 } | |
1240 } | |
1241 gclog_or_tty->print("Added card " PTR_FORMAT " to region [" PTR_FORMAT "...]" | |
1242 " for ref " PTR_FORMAT ".\n", | |
1243 _recorded_cards[i], _recorded_regions[i]->bottom(), | |
1244 _recorded_oops[i]); | |
1245 } | |
1246 } | |
1247 | |
2173 | 1248 void HeapRegionRemSet::reset_for_cleanup_tasks() { |
1249 SparsePRT::reset_for_cleanup_tasks(); | |
1250 } | |
1251 | |
1252 void HeapRegionRemSet::do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task) { | |
1253 _other_regions.do_cleanup_work(hrrs_cleanup_task); | |
1254 } | |
1255 | |
1256 void | |
1257 HeapRegionRemSet::finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task) { | |
1258 SparsePRT::finish_cleanup_task(hrrs_cleanup_task); | |
1259 } | |
1260 | |
342 | 1261 #ifndef PRODUCT |
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1262 void PerRegionTable::test_fl_mem_size() { |
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1263 PerRegionTable* dummy = alloc(NULL); |
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1264 free(dummy); |
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1265 guarantee(dummy->mem_size() == fl_mem_size(), "fl_mem_size() does not return the correct element size"); |
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1266 // try to reset the state |
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1267 _free_list = NULL; |
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1268 delete dummy; |
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1269 } |
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1270 |
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1271 void HeapRegionRemSet::test_prt() { |
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1272 PerRegionTable::test_fl_mem_size(); |
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1273 } |
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1274 |
342 | 1275 void HeapRegionRemSet::test() { |
1276 os::sleep(Thread::current(), (jlong)5000, false); | |
1277 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
1278 | |
1261
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1279 // Run with "-XX:G1LogRSetRegionEntries=2", so that 1 and 5 end up in same |
342 | 1280 // hash bucket. |
1281 HeapRegion* hr0 = g1h->region_at(0); | |
1282 HeapRegion* hr1 = g1h->region_at(1); | |
1283 HeapRegion* hr2 = g1h->region_at(5); | |
1284 HeapRegion* hr3 = g1h->region_at(6); | |
1285 HeapRegion* hr4 = g1h->region_at(7); | |
1286 HeapRegion* hr5 = g1h->region_at(8); | |
1287 | |
1288 HeapWord* hr1_start = hr1->bottom(); | |
1289 HeapWord* hr1_mid = hr1_start + HeapRegion::GrainWords/2; | |
1290 HeapWord* hr1_last = hr1->end() - 1; | |
1291 | |
1292 HeapWord* hr2_start = hr2->bottom(); | |
1293 HeapWord* hr2_mid = hr2_start + HeapRegion::GrainWords/2; | |
1294 HeapWord* hr2_last = hr2->end() - 1; | |
1295 | |
1296 HeapWord* hr3_start = hr3->bottom(); | |
1297 HeapWord* hr3_mid = hr3_start + HeapRegion::GrainWords/2; | |
1298 HeapWord* hr3_last = hr3->end() - 1; | |
1299 | |
1300 HeapRegionRemSet* hrrs = hr0->rem_set(); | |
1301 | |
1302 // Make three references from region 0x101... | |
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1303 hrrs->add_reference((OopOrNarrowOopStar)hr1_start); |
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1304 hrrs->add_reference((OopOrNarrowOopStar)hr1_mid); |
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1305 hrrs->add_reference((OopOrNarrowOopStar)hr1_last); |
342 | 1306 |
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1307 hrrs->add_reference((OopOrNarrowOopStar)hr2_start); |
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1308 hrrs->add_reference((OopOrNarrowOopStar)hr2_mid); |
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1309 hrrs->add_reference((OopOrNarrowOopStar)hr2_last); |
342 | 1310 |
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1311 hrrs->add_reference((OopOrNarrowOopStar)hr3_start); |
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1312 hrrs->add_reference((OopOrNarrowOopStar)hr3_mid); |
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1313 hrrs->add_reference((OopOrNarrowOopStar)hr3_last); |
342 | 1314 |
1315 // Now cause a coarsening. | |
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1316 hrrs->add_reference((OopOrNarrowOopStar)hr4->bottom()); |
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1317 hrrs->add_reference((OopOrNarrowOopStar)hr5->bottom()); |
342 | 1318 |
1319 // Now, does iteration yield these three? | |
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1320 HeapRegionRemSetIterator iter(hrrs); |
342 | 1321 size_t sum = 0; |
1322 size_t card_index; | |
1323 while (iter.has_next(card_index)) { | |
1324 HeapWord* card_start = | |
1325 G1CollectedHeap::heap()->bot_shared()->address_for_index(card_index); | |
1326 gclog_or_tty->print_cr(" Card " PTR_FORMAT ".", card_start); | |
1327 sum++; | |
1328 } | |
1329 guarantee(sum == 11 - 3 + 2048, "Failure"); | |
1330 guarantee(sum == hrrs->occupied(), "Failure"); | |
1331 } | |
1332 #endif |