Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1RemSet.cpp @ 20767:ee10217e3d03
Merge
author | asaha |
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date | Wed, 05 Nov 2014 15:35:11 -0800 |
parents | 6948da6d7c13 |
children | 7848fc12602b |
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/concurrentG1RefineThread.hpp" | |
28 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" | |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1HotCardCache.hpp" |
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32 #include "gc_implementation/g1/g1GCPhaseTimes.hpp" |
1972 | 33 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
34 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
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35 #include "gc_implementation/g1/heapRegionManager.inline.hpp" |
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36 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
1972 | 37 #include "memory/iterator.hpp" |
38 #include "oops/oop.inline.hpp" | |
39 #include "utilities/intHisto.hpp" | |
342 | 40 |
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41 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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42 |
342 | 43 #define CARD_REPEAT_HISTO 0 |
44 | |
45 #if CARD_REPEAT_HISTO | |
46 static size_t ct_freq_sz; | |
47 static jbyte* ct_freq = NULL; | |
48 | |
49 void init_ct_freq_table(size_t heap_sz_bytes) { | |
50 if (ct_freq == NULL) { | |
51 ct_freq_sz = heap_sz_bytes/CardTableModRefBS::card_size; | |
52 ct_freq = new jbyte[ct_freq_sz]; | |
53 for (size_t j = 0; j < ct_freq_sz; j++) ct_freq[j] = 0; | |
54 } | |
55 } | |
56 | |
57 void ct_freq_note_card(size_t index) { | |
58 assert(0 <= index && index < ct_freq_sz, "Bounds error."); | |
59 if (ct_freq[index] < 100) { ct_freq[index]++; } | |
60 } | |
61 | |
62 static IntHistogram card_repeat_count(10, 10); | |
63 | |
64 void ct_freq_update_histo_and_reset() { | |
65 for (size_t j = 0; j < ct_freq_sz; j++) { | |
66 card_repeat_count.add_entry(ct_freq[j]); | |
67 ct_freq[j] = 0; | |
68 } | |
69 | |
70 } | |
71 #endif | |
72 | |
1861 | 73 G1RemSet::G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs) |
74 : _g1(g1), _conc_refine_cards(0), | |
75 _ct_bs(ct_bs), _g1p(_g1->g1_policy()), | |
342 | 76 _cg1r(g1->concurrent_g1_refine()), |
1705 | 77 _cset_rs_update_cl(NULL), |
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78 _cards_scanned(NULL), _total_cards_scanned(0), |
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79 _prev_period_summary() |
342 | 80 { |
81 _seq_task = new SubTasksDone(NumSeqTasks); | |
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82 guarantee(n_workers() > 0, "There should be some workers"); |
6197 | 83 _cset_rs_update_cl = NEW_C_HEAP_ARRAY(OopsInHeapRegionClosure*, n_workers(), mtGC); |
616
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84 for (uint i = 0; i < n_workers(); i++) { |
1705 | 85 _cset_rs_update_cl[i] = NULL; |
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86 } |
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87 if (G1SummarizeRSetStats) { |
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88 _prev_period_summary.initialize(this); |
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89 } |
342 | 90 } |
91 | |
1861 | 92 G1RemSet::~G1RemSet() { |
342 | 93 delete _seq_task; |
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94 for (uint i = 0; i < n_workers(); i++) { |
1705 | 95 assert(_cset_rs_update_cl[i] == NULL, "it should be"); |
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96 } |
6197 | 97 FREE_C_HEAP_ARRAY(OopsInHeapRegionClosure*, _cset_rs_update_cl, mtGC); |
342 | 98 } |
99 | |
100 void CountNonCleanMemRegionClosure::do_MemRegion(MemRegion mr) { | |
101 if (_g1->is_in_g1_reserved(mr.start())) { | |
102 _n += (int) ((mr.byte_size() / CardTableModRefBS::card_size)); | |
103 if (_start_first == NULL) _start_first = mr.start(); | |
104 } | |
105 } | |
106 | |
107 class ScanRSClosure : public HeapRegionClosure { | |
108 size_t _cards_done, _cards; | |
109 G1CollectedHeap* _g1h; | |
12080 | 110 |
342 | 111 OopsInHeapRegionClosure* _oc; |
20494 | 112 CodeBlobClosure* _code_root_cl; |
12080 | 113 |
342 | 114 G1BlockOffsetSharedArray* _bot_shared; |
12343 | 115 G1SATBCardTableModRefBS *_ct_bs; |
12080 | 116 |
117 double _strong_code_root_scan_time_sec; | |
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118 uint _worker_i; |
12080 | 119 int _block_size; |
120 bool _try_claimed; | |
121 | |
342 | 122 public: |
12080 | 123 ScanRSClosure(OopsInHeapRegionClosure* oc, |
20494 | 124 CodeBlobClosure* code_root_cl, |
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125 uint worker_i) : |
342 | 126 _oc(oc), |
12080 | 127 _code_root_cl(code_root_cl), |
128 _strong_code_root_scan_time_sec(0.0), | |
342 | 129 _cards(0), |
130 _cards_done(0), | |
131 _worker_i(worker_i), | |
132 _try_claimed(false) | |
133 { | |
134 _g1h = G1CollectedHeap::heap(); | |
135 _bot_shared = _g1h->bot_shared(); | |
12343 | 136 _ct_bs = _g1h->g1_barrier_set(); |
1261 | 137 _block_size = MAX2<int>(G1RSetScanBlockSize, 1); |
342 | 138 } |
139 | |
140 void set_try_claimed() { _try_claimed = true; } | |
141 | |
142 void scanCard(size_t index, HeapRegion *r) { | |
4023 | 143 // Stack allocate the DirtyCardToOopClosure instance |
144 HeapRegionDCTOC cl(_g1h, r, _oc, | |
145 CardTableModRefBS::Precise, | |
146 HeapRegionDCTOC::IntoCSFilterKind); | |
342 | 147 |
148 // Set the "from" region in the closure. | |
149 _oc->set_region(r); | |
150 HeapWord* card_start = _bot_shared->address_for_index(index); | |
151 HeapWord* card_end = card_start + G1BlockOffsetSharedArray::N_words; | |
152 Space *sp = SharedHeap::heap()->space_containing(card_start); | |
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153 MemRegion sm_region = sp->used_region_at_save_marks(); |
342 | 154 MemRegion mr = sm_region.intersection(MemRegion(card_start,card_end)); |
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155 if (!mr.is_empty() && !_ct_bs->is_card_claimed(index)) { |
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156 // We make the card as "claimed" lazily (so races are possible |
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157 // but they're benign), which reduces the number of duplicate |
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158 // scans (the rsets of the regions in the cset can intersect). |
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159 _ct_bs->set_card_claimed(index); |
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160 _cards_done++; |
4023 | 161 cl.do_MemRegion(mr); |
342 | 162 } |
163 } | |
164 | |
165 void printCard(HeapRegion* card_region, size_t card_index, | |
166 HeapWord* card_start) { | |
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167 gclog_or_tty->print_cr("T " UINT32_FORMAT " Region [" PTR_FORMAT ", " PTR_FORMAT ") " |
342 | 168 "RS names card %p: " |
169 "[" PTR_FORMAT ", " PTR_FORMAT ")", | |
170 _worker_i, | |
171 card_region->bottom(), card_region->end(), | |
172 card_index, | |
173 card_start, card_start + G1BlockOffsetSharedArray::N_words); | |
174 } | |
175 | |
12080 | 176 void scan_strong_code_roots(HeapRegion* r) { |
177 double scan_start = os::elapsedTime(); | |
178 r->strong_code_roots_do(_code_root_cl); | |
179 _strong_code_root_scan_time_sec += (os::elapsedTime() - scan_start); | |
180 } | |
181 | |
342 | 182 bool doHeapRegion(HeapRegion* r) { |
183 assert(r->in_collection_set(), "should only be called on elements of CS."); | |
184 HeapRegionRemSet* hrrs = r->rem_set(); | |
185 if (hrrs->iter_is_complete()) return false; // All done. | |
186 if (!_try_claimed && !hrrs->claim_iter()) return false; | |
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187 // If we ever free the collection set concurrently, we should also |
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188 // clear the card table concurrently therefore we won't need to |
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189 // add regions of the collection set to the dirty cards region. |
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190 _g1h->push_dirty_cards_region(r); |
342 | 191 // If we didn't return above, then |
192 // _try_claimed || r->claim_iter() | |
193 // is true: either we're supposed to work on claimed-but-not-complete | |
194 // regions, or we successfully claimed the region. | |
12080 | 195 |
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196 HeapRegionRemSetIterator iter(hrrs); |
342 | 197 size_t card_index; |
1261 | 198 |
199 // We claim cards in block so as to recude the contention. The block size is determined by | |
200 // the G1RSetScanBlockSize parameter. | |
201 size_t jump_to_card = hrrs->iter_claimed_next(_block_size); | |
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202 for (size_t current_card = 0; iter.has_next(card_index); current_card++) { |
1261 | 203 if (current_card >= jump_to_card + _block_size) { |
204 jump_to_card = hrrs->iter_claimed_next(_block_size); | |
747 | 205 } |
1261 | 206 if (current_card < jump_to_card) continue; |
342 | 207 HeapWord* card_start = _g1h->bot_shared()->address_for_index(card_index); |
208 #if 0 | |
209 gclog_or_tty->print("Rem set iteration yielded card [" PTR_FORMAT ", " PTR_FORMAT ").\n", | |
210 card_start, card_start + CardTableModRefBS::card_size_in_words); | |
211 #endif | |
212 | |
213 HeapRegion* card_region = _g1h->heap_region_containing(card_start); | |
214 _cards++; | |
215 | |
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216 if (!card_region->is_on_dirty_cards_region_list()) { |
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217 _g1h->push_dirty_cards_region(card_region); |
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218 } |
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219 |
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220 // If the card is dirty, then we will scan it during updateRS. |
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221 if (!card_region->in_collection_set() && |
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222 !_ct_bs->is_card_dirty(card_index)) { |
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223 scanCard(card_index, card_region); |
342 | 224 } |
225 } | |
747 | 226 if (!_try_claimed) { |
12080 | 227 // Scan the strong code root list attached to the current region |
228 scan_strong_code_roots(r); | |
229 | |
747 | 230 hrrs->set_iter_complete(); |
231 } | |
342 | 232 return false; |
233 } | |
12080 | 234 |
235 double strong_code_root_scan_time_sec() { | |
236 return _strong_code_root_scan_time_sec; | |
237 } | |
238 | |
342 | 239 size_t cards_done() { return _cards_done;} |
240 size_t cards_looked_up() { return _cards;} | |
241 }; | |
242 | |
12080 | 243 void G1RemSet::scanRS(OopsInHeapRegionClosure* oc, |
20494 | 244 CodeBlobClosure* code_root_cl, |
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245 uint worker_i) { |
342 | 246 double rs_time_start = os::elapsedTime(); |
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247 HeapRegion *startRegion = _g1->start_cset_region_for_worker(worker_i); |
342 | 248 |
12080 | 249 ScanRSClosure scanRScl(oc, code_root_cl, worker_i); |
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250 |
342 | 251 _g1->collection_set_iterate_from(startRegion, &scanRScl); |
252 scanRScl.set_try_claimed(); | |
253 _g1->collection_set_iterate_from(startRegion, &scanRScl); | |
254 | |
12080 | 255 double scan_rs_time_sec = (os::elapsedTime() - rs_time_start) |
256 - scanRScl.strong_code_root_scan_time_sec(); | |
342 | 257 |
12080 | 258 assert(_cards_scanned != NULL, "invariant"); |
342 | 259 _cards_scanned[worker_i] = scanRScl.cards_done(); |
260 | |
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261 _g1p->phase_times()->record_scan_rs_time(worker_i, scan_rs_time_sec * 1000.0); |
12080 | 262 _g1p->phase_times()->record_strong_code_root_scan_time(worker_i, |
263 scanRScl.strong_code_root_scan_time_sec() * 1000.0); | |
342 | 264 } |
265 | |
1705 | 266 // Closure used for updating RSets and recording references that |
267 // point into the collection set. Only called during an | |
268 // evacuation pause. | |
269 | |
270 class RefineRecordRefsIntoCSCardTableEntryClosure: public CardTableEntryClosure { | |
271 G1RemSet* _g1rs; | |
272 DirtyCardQueue* _into_cset_dcq; | |
273 public: | |
274 RefineRecordRefsIntoCSCardTableEntryClosure(G1CollectedHeap* g1h, | |
275 DirtyCardQueue* into_cset_dcq) : | |
276 _g1rs(g1h->g1_rem_set()), _into_cset_dcq(into_cset_dcq) | |
277 {} | |
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278 bool do_card_ptr(jbyte* card_ptr, uint worker_i) { |
1705 | 279 // The only time we care about recording cards that |
280 // contain references that point into the collection set | |
281 // is during RSet updating within an evacuation pause. | |
282 // In this case worker_i should be the id of a GC worker thread. | |
283 assert(SafepointSynchronize::is_at_safepoint(), "not during an evacuation pause"); | |
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284 assert(worker_i < (ParallelGCThreads == 0 ? 1 : ParallelGCThreads), "should be a GC worker"); |
342 | 285 |
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286 if (_g1rs->refine_card(card_ptr, worker_i, true)) { |
1705 | 287 // 'card_ptr' contains references that point into the collection |
288 // set. We need to record the card in the DCQS | |
289 // (G1CollectedHeap::into_cset_dirty_card_queue_set()) | |
290 // that's used for that purpose. | |
291 // | |
292 // Enqueue the card | |
293 _into_cset_dcq->enqueue(card_ptr); | |
294 } | |
295 return true; | |
296 } | |
297 }; | |
298 | |
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299 void G1RemSet::updateRS(DirtyCardQueue* into_cset_dcq, uint worker_i) { |
342 | 300 double start = os::elapsedTime(); |
1705 | 301 // Apply the given closure to all remaining log entries. |
302 RefineRecordRefsIntoCSCardTableEntryClosure into_cset_update_rs_cl(_g1, into_cset_dcq); | |
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303 |
1705 | 304 _g1->iterate_dirty_card_closure(&into_cset_update_rs_cl, into_cset_dcq, false, worker_i); |
305 | |
794 | 306 // Now there should be no dirty cards. |
307 if (G1RSLogCheckCardTable) { | |
308 CountNonCleanMemRegionClosure cl(_g1); | |
309 _ct_bs->mod_card_iterate(&cl); | |
310 // XXX This isn't true any more: keeping cards of young regions | |
311 // marked dirty broke it. Need some reasonable fix. | |
312 guarantee(cl.n() == 0, "Card table should be clean."); | |
342 | 313 } |
794 | 314 |
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315 _g1p->phase_times()->record_update_rs_time(worker_i, (os::elapsedTime() - start) * 1000.0); |
342 | 316 } |
317 | |
1861 | 318 void G1RemSet::cleanupHRRS() { |
342 | 319 HeapRegionRemSet::cleanup(); |
320 } | |
321 | |
1861 | 322 void G1RemSet::oops_into_collection_set_do(OopsInHeapRegionClosure* oc, |
20494 | 323 CodeBlobClosure* code_root_cl, |
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324 uint worker_i) { |
342 | 325 #if CARD_REPEAT_HISTO |
326 ct_freq_update_histo_and_reset(); | |
327 #endif | |
328 | |
1705 | 329 // We cache the value of 'oc' closure into the appropriate slot in the |
330 // _cset_rs_update_cl for this worker | |
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331 assert(worker_i < n_workers(), "sanity"); |
1705 | 332 _cset_rs_update_cl[worker_i] = oc; |
333 | |
334 // A DirtyCardQueue that is used to hold cards containing references | |
335 // that point into the collection set. This DCQ is associated with a | |
336 // special DirtyCardQueueSet (see g1CollectedHeap.hpp). Under normal | |
337 // circumstances (i.e. the pause successfully completes), these cards | |
338 // are just discarded (there's no need to update the RSets of regions | |
339 // that were in the collection set - after the pause these regions | |
340 // are wholly 'free' of live objects. In the event of an evacuation | |
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341 // failure the cards/buffers in this queue set are passed to the |
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342 // DirtyCardQueueSet that is used to manage RSet updates |
1705 | 343 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); |
344 | |
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345 assert((ParallelGCThreads > 0) || worker_i == 0, "invariant"); |
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346 |
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347 // The two flags below were introduced temporarily to serialize |
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348 // the updating and scanning of remembered sets. There are some |
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349 // race conditions when these two operations are done in parallel |
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350 // and they are causing failures. When we resolve said race |
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351 // conditions, we'll revert back to parallel remembered set |
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352 // updating and scanning. See CRs 6677707 and 6677708. |
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353 if (G1UseParallelRSetUpdating || (worker_i == 0)) { |
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354 updateRS(&into_cset_dcq, worker_i); |
342 | 355 } else { |
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356 _g1p->phase_times()->record_update_rs_processed_buffers(worker_i, 0); |
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357 _g1p->phase_times()->record_update_rs_time(worker_i, 0.0); |
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358 } |
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359 if (G1UseParallelRSetScanning || (worker_i == 0)) { |
12080 | 360 scanRS(oc, code_root_cl, worker_i); |
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361 } else { |
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362 _g1p->phase_times()->record_scan_rs_time(worker_i, 0.0); |
342 | 363 } |
1705 | 364 |
365 // We now clear the cached values of _cset_rs_update_cl for this worker | |
366 _cset_rs_update_cl[worker_i] = NULL; | |
342 | 367 } |
368 | |
1861 | 369 void G1RemSet::prepare_for_oops_into_collection_set_do() { |
342 | 370 cleanupHRRS(); |
371 _g1->set_refine_cte_cl_concurrency(false); | |
372 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
373 dcqs.concatenate_logs(); | |
374 | |
375 guarantee( _cards_scanned == NULL, "invariant" ); | |
6197 | 376 _cards_scanned = NEW_C_HEAP_ARRAY(size_t, n_workers(), mtGC); |
545 | 377 for (uint i = 0; i < n_workers(); ++i) { |
378 _cards_scanned[i] = 0; | |
379 } | |
342 | 380 _total_cards_scanned = 0; |
381 } | |
382 | |
1861 | 383 void G1RemSet::cleanup_after_oops_into_collection_set_do() { |
342 | 384 guarantee( _cards_scanned != NULL, "invariant" ); |
385 _total_cards_scanned = 0; | |
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386 for (uint i = 0; i < n_workers(); ++i) { |
342 | 387 _total_cards_scanned += _cards_scanned[i]; |
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388 } |
6197 | 389 FREE_C_HEAP_ARRAY(size_t, _cards_scanned, mtGC); |
342 | 390 _cards_scanned = NULL; |
391 // Cleanup after copy | |
392 _g1->set_refine_cte_cl_concurrency(true); | |
393 // Set all cards back to clean. | |
394 _g1->cleanUpCardTable(); | |
794 | 395 |
1705 | 396 DirtyCardQueueSet& into_cset_dcqs = _g1->into_cset_dirty_card_queue_set(); |
397 int into_cset_n_buffers = into_cset_dcqs.completed_buffers_num(); | |
398 | |
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399 if (_g1->evacuation_failed()) { |
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400 double restore_remembered_set_start = os::elapsedTime(); |
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401 |
1705 | 402 // Restore remembered sets for the regions pointing into the collection set. |
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403 // We just need to transfer the completed buffers from the DirtyCardQueueSet |
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404 // used to hold cards that contain references that point into the collection set |
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405 // to the DCQS used to hold the deferred RS updates. |
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406 _g1->dirty_card_queue_set().merge_bufferlists(&into_cset_dcqs); |
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407 _g1->g1_policy()->phase_times()->record_evac_fail_restore_remsets((os::elapsedTime() - restore_remembered_set_start) * 1000.0); |
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408 } |
1705 | 409 |
410 // Free any completed buffers in the DirtyCardQueueSet used to hold cards | |
411 // which contain references that point into the collection. | |
412 _g1->into_cset_dirty_card_queue_set().clear(); | |
413 assert(_g1->into_cset_dirty_card_queue_set().completed_buffers_num() == 0, | |
414 "all buffers should be freed"); | |
415 _g1->into_cset_dirty_card_queue_set().clear_n_completed_buffers(); | |
342 | 416 } |
417 | |
418 class ScrubRSClosure: public HeapRegionClosure { | |
419 G1CollectedHeap* _g1h; | |
420 BitMap* _region_bm; | |
421 BitMap* _card_bm; | |
422 CardTableModRefBS* _ctbs; | |
423 public: | |
424 ScrubRSClosure(BitMap* region_bm, BitMap* card_bm) : | |
425 _g1h(G1CollectedHeap::heap()), | |
426 _region_bm(region_bm), _card_bm(card_bm), | |
12343 | 427 _ctbs(_g1h->g1_barrier_set()) {} |
342 | 428 |
429 bool doHeapRegion(HeapRegion* r) { | |
430 if (!r->continuesHumongous()) { | |
431 r->rem_set()->scrub(_ctbs, _region_bm, _card_bm); | |
432 } | |
433 return false; | |
434 } | |
435 }; | |
436 | |
1861 | 437 void G1RemSet::scrub(BitMap* region_bm, BitMap* card_bm) { |
342 | 438 ScrubRSClosure scrub_cl(region_bm, card_bm); |
439 _g1->heap_region_iterate(&scrub_cl); | |
440 } | |
441 | |
1861 | 442 void G1RemSet::scrub_par(BitMap* region_bm, BitMap* card_bm, |
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443 uint worker_num, int claim_val) { |
342 | 444 ScrubRSClosure scrub_cl(region_bm, card_bm); |
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445 _g1->heap_region_par_iterate_chunked(&scrub_cl, |
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446 worker_num, |
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447 n_workers(), |
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448 claim_val); |
342 | 449 } |
450 | |
4839 | 451 G1TriggerClosure::G1TriggerClosure() : |
452 _triggered(false) { } | |
453 | |
454 G1InvokeIfNotTriggeredClosure::G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t_cl, | |
455 OopClosure* oop_cl) : | |
456 _trigger_cl(t_cl), _oop_cl(oop_cl) { } | |
1705 | 457 |
4839 | 458 G1Mux2Closure::G1Mux2Closure(OopClosure *c1, OopClosure *c2) : |
459 _c1(c1), _c2(c2) { } | |
1705 | 460 |
4839 | 461 G1UpdateRSOrPushRefOopClosure:: |
462 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h, | |
463 G1RemSet* rs, | |
464 OopsInHeapRegionClosure* push_ref_cl, | |
465 bool record_refs_into_cset, | |
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466 uint worker_i) : |
4839 | 467 _g1(g1h), _g1_rem_set(rs), _from(NULL), |
468 _record_refs_into_cset(record_refs_into_cset), | |
469 _push_ref_cl(push_ref_cl), _worker_i(worker_i) { } | |
1705 | 470 |
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471 // Returns true if the given card contains references that point |
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472 // into the collection set, if we're checking for such references; |
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473 // false otherwise. |
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474 |
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475 bool G1RemSet::refine_card(jbyte* card_ptr, uint worker_i, |
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476 bool check_for_refs_into_cset) { |
20337 | 477 assert(_g1->is_in_exact(_ct_bs->addr_for(card_ptr)), |
478 err_msg("Card at "PTR_FORMAT" index "SIZE_FORMAT" representing heap at "PTR_FORMAT" (%u) must be in committed heap", | |
479 p2i(card_ptr), | |
480 _ct_bs->index_for(_ct_bs->addr_for(card_ptr)), | |
481 _ct_bs->addr_for(card_ptr), | |
482 _g1->addr_to_region(_ct_bs->addr_for(card_ptr)))); | |
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483 |
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484 // If the card is no longer dirty, nothing to do. |
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485 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
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486 // No need to return that this card contains refs that point |
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487 // into the collection set. |
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488 return false; |
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489 } |
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490 |
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491 // Construct the region representing the card. |
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492 HeapWord* start = _ct_bs->addr_for(card_ptr); |
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493 // And find the region containing it. |
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494 HeapRegion* r = _g1->heap_region_containing(start); |
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495 |
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496 // Why do we have to check here whether a card is on a young region, |
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497 // given that we dirty young regions and, as a result, the |
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498 // post-barrier is supposed to filter them out and never to enqueue |
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499 // them? When we allocate a new region as the "allocation region" we |
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500 // actually dirty its cards after we release the lock, since card |
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501 // dirtying while holding the lock was a performance bottleneck. So, |
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502 // as a result, it is possible for other threads to actually |
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503 // allocate objects in the region (after the acquire the lock) |
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504 // before all the cards on the region are dirtied. This is unlikely, |
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505 // and it doesn't happen often, but it can happen. So, the extra |
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506 // check below filters out those cards. |
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507 if (r->is_young()) { |
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508 return false; |
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509 } |
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510 |
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511 // While we are processing RSet buffers during the collection, we |
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512 // actually don't want to scan any cards on the collection set, |
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513 // since we don't want to update remebered sets with entries that |
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514 // point into the collection set, given that live objects from the |
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515 // collection set are about to move and such entries will be stale |
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516 // very soon. This change also deals with a reliability issue which |
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517 // involves scanning a card in the collection set and coming across |
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518 // an array that was being chunked and looking malformed. Note, |
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519 // however, that if evacuation fails, we have to scan any objects |
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520 // that were not moved and create any missing entries. |
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521 if (r->in_collection_set()) { |
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522 return false; |
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523 } |
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524 |
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525 // The result from the hot card cache insert call is either: |
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526 // * pointer to the current card |
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527 // (implying that the current card is not 'hot'), |
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528 // * null |
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529 // (meaning we had inserted the card ptr into the "hot" card cache, |
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530 // which had some headroom), |
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531 // * a pointer to a "hot" card that was evicted from the "hot" cache. |
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532 // |
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533 |
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534 G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
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535 if (hot_card_cache->use_cache()) { |
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536 assert(!check_for_refs_into_cset, "sanity"); |
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537 assert(!SafepointSynchronize::is_at_safepoint(), "sanity"); |
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538 |
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539 card_ptr = hot_card_cache->insert(card_ptr); |
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540 if (card_ptr == NULL) { |
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541 // There was no eviction. Nothing to do. |
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542 return false; |
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543 } |
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544 |
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545 start = _ct_bs->addr_for(card_ptr); |
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546 r = _g1->heap_region_containing(start); |
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547 |
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548 // Checking whether the region we got back from the cache |
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549 // is young here is inappropriate. The region could have been |
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550 // freed, reallocated and tagged as young while in the cache. |
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551 // Hence we could see its young type change at any time. |
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552 } |
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553 |
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554 // Don't use addr_for(card_ptr + 1) which can ask for |
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555 // a card beyond the heap. This is not safe without a perm |
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556 // gen at the upper end of the heap. |
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557 HeapWord* end = start + CardTableModRefBS::card_size_in_words; |
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558 MemRegion dirtyRegion(start, end); |
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559 |
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560 #if CARD_REPEAT_HISTO |
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561 init_ct_freq_table(_g1->max_capacity()); |
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562 ct_freq_note_card(_ct_bs->index_for(start)); |
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563 #endif |
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564 |
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565 OopsInHeapRegionClosure* oops_in_heap_closure = NULL; |
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566 if (check_for_refs_into_cset) { |
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567 // ConcurrentG1RefineThreads have worker numbers larger than what |
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568 // _cset_rs_update_cl[] is set up to handle. But those threads should |
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569 // only be active outside of a collection which means that when they |
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570 // reach here they should have check_for_refs_into_cset == false. |
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571 assert((size_t)worker_i < n_workers(), "index of worker larger than _cset_rs_update_cl[].length"); |
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572 oops_in_heap_closure = _cset_rs_update_cl[worker_i]; |
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573 } |
4839 | 574 G1UpdateRSOrPushRefOopClosure update_rs_oop_cl(_g1, |
575 _g1->g1_rem_set(), | |
576 oops_in_heap_closure, | |
577 check_for_refs_into_cset, | |
578 worker_i); | |
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579 update_rs_oop_cl.set_from(r); |
1705 | 580 |
4839 | 581 G1TriggerClosure trigger_cl; |
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582 FilterIntoCSClosure into_cs_cl(NULL, _g1, &trigger_cl); |
4839 | 583 G1InvokeIfNotTriggeredClosure invoke_cl(&trigger_cl, &into_cs_cl); |
584 G1Mux2Closure mux(&invoke_cl, &update_rs_oop_cl); | |
1705 | 585 |
586 FilterOutOfRegionClosure filter_then_update_rs_oop_cl(r, | |
587 (check_for_refs_into_cset ? | |
588 (OopClosure*)&mux : | |
589 (OopClosure*)&update_rs_oop_cl)); | |
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590 |
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591 // The region for the current card may be a young region. The |
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592 // current card may have been a card that was evicted from the |
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593 // card cache. When the card was inserted into the cache, we had |
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594 // determined that its region was non-young. While in the cache, |
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595 // the region may have been freed during a cleanup pause, reallocated |
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596 // and tagged as young. |
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597 // |
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598 // We wish to filter out cards for such a region but the current |
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599 // thread, if we're running concurrently, may "see" the young type |
1666
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600 // change at any time (so an earlier "is_young" check may pass or |
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601 // fail arbitrarily). We tell the iteration code to perform this |
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602 // filtering when it has been determined that there has been an actual |
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603 // allocation in this region and making it safe to check the young type. |
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604 bool filter_young = true; |
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605 |
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606 HeapWord* stop_point = |
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607 r->oops_on_card_seq_iterate_careful(dirtyRegion, |
1666
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608 &filter_then_update_rs_oop_cl, |
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609 filter_young, |
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610 card_ptr); |
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611 |
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612 // If stop_point is non-null, then we encountered an unallocated region |
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613 // (perhaps the unfilled portion of a TLAB.) For now, we'll dirty the |
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614 // card and re-enqueue: if we put off the card until a GC pause, then the |
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615 // unallocated portion will be filled in. Alternatively, we might try |
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616 // the full complexity of the technique used in "regular" precleaning. |
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617 if (stop_point != NULL) { |
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618 // The card might have gotten re-dirtied and re-enqueued while we |
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619 // worked. (In fact, it's pretty likely.) |
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620 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
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621 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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622 MutexLockerEx x(Shared_DirtyCardQ_lock, |
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623 Mutex::_no_safepoint_check_flag); |
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624 DirtyCardQueue* sdcq = |
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625 JavaThread::dirty_card_queue_set().shared_dirty_card_queue(); |
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626 sdcq->enqueue(card_ptr); |
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627 } |
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628 } else { |
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629 _conc_refine_cards++; |
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630 } |
1705 | 631 |
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632 // This gets set to true if the card being refined has |
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633 // references that point into the collection set. |
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634 bool has_refs_into_cset = trigger_cl.triggered(); |
342 | 635 |
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636 // We should only be detecting that the card contains references |
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637 // that point into the collection set if the current thread is |
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638 // a GC worker thread. |
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639 assert(!has_refs_into_cset || SafepointSynchronize::is_at_safepoint(), |
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640 "invalid result at non safepoint"); |
1705 | 641 |
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642 return has_refs_into_cset; |
342 | 643 } |
644 | |
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645 void G1RemSet::print_periodic_summary_info(const char* header) { |
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646 G1RemSetSummary current; |
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647 current.initialize(this); |
342 | 648 |
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649 _prev_period_summary.subtract_from(¤t); |
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650 print_summary_info(&_prev_period_summary, header); |
342 | 651 |
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652 _prev_period_summary.set(¤t); |
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653 } |
794 | 654 |
1861 | 655 void G1RemSet::print_summary_info() { |
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656 G1RemSetSummary current; |
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657 current.initialize(this); |
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658 |
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659 print_summary_info(¤t, " Cumulative RS summary"); |
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660 } |
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661 |
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662 void G1RemSet::print_summary_info(G1RemSetSummary * summary, const char * header) { |
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663 assert(summary != NULL, "just checking"); |
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664 |
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665 if (header != NULL) { |
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666 gclog_or_tty->print_cr("%s", header); |
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667 } |
342 | 668 |
669 #if CARD_REPEAT_HISTO | |
670 gclog_or_tty->print_cr("\nG1 card_repeat count histogram: "); | |
671 gclog_or_tty->print_cr(" # of repeats --> # of cards with that number."); | |
672 card_repeat_count.print_on(gclog_or_tty); | |
673 #endif | |
674 | |
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675 summary->print_on(gclog_or_tty); |
342 | 676 } |
1705 | 677 |
1861 | 678 void G1RemSet::prepare_for_verify() { |
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679 if (G1HRRSFlushLogBuffersOnVerify && |
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680 (VerifyBeforeGC || VerifyAfterGC) |
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681 && (!_g1->full_collection() || G1VerifyRSetsDuringFullGC)) { |
342 | 682 cleanupHRRS(); |
683 _g1->set_refine_cte_cl_concurrency(false); | |
684 if (SafepointSynchronize::is_at_safepoint()) { | |
685 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
686 dcqs.concatenate_logs(); | |
687 } | |
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688 |
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689 G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
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690 bool use_hot_card_cache = hot_card_cache->use_cache(); |
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691 hot_card_cache->set_use_cache(false); |
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692 |
1705 | 693 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); |
694 updateRS(&into_cset_dcq, 0); | |
695 _g1->into_cset_dirty_card_queue_set().clear(); | |
637
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696 |
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697 hot_card_cache->set_use_cache(use_hot_card_cache); |
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698 assert(JavaThread::dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
342 | 699 } |
700 } |