Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1RemSet.cpp @ 13059:46d7652b223c
8026853: Prepare GC code for collector policy regression fix
Summary: Cleanup related to the NewSize and MaxNewSize bugs
Reviewed-by: tschatzl, jcoomes, ehelin
| author | jwilhelm |
|---|---|
| date | Mon, 21 Oct 2013 18:56:20 +0200 |
| parents | 7ec10139bf37 |
| children | 63a4eb8bcd23 eff02b5bd56c |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "gc_implementation/g1/bufferingOopClosure.hpp" | |
| 27 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
| 28 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" | |
| 29 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" | |
| 30 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 31 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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32 #include "gc_implementation/g1/g1HotCardCache.hpp" |
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33 #include "gc_implementation/g1/g1GCPhaseTimes.hpp" |
| 1972 | 34 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
| 35 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
| 36 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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37 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
| 1972 | 38 #include "memory/iterator.hpp" |
| 39 #include "oops/oop.inline.hpp" | |
| 40 #include "utilities/intHisto.hpp" | |
| 342 | 41 |
| 42 #define CARD_REPEAT_HISTO 0 | |
| 43 | |
| 44 #if CARD_REPEAT_HISTO | |
| 45 static size_t ct_freq_sz; | |
| 46 static jbyte* ct_freq = NULL; | |
| 47 | |
| 48 void init_ct_freq_table(size_t heap_sz_bytes) { | |
| 49 if (ct_freq == NULL) { | |
| 50 ct_freq_sz = heap_sz_bytes/CardTableModRefBS::card_size; | |
| 51 ct_freq = new jbyte[ct_freq_sz]; | |
| 52 for (size_t j = 0; j < ct_freq_sz; j++) ct_freq[j] = 0; | |
| 53 } | |
| 54 } | |
| 55 | |
| 56 void ct_freq_note_card(size_t index) { | |
| 57 assert(0 <= index && index < ct_freq_sz, "Bounds error."); | |
| 58 if (ct_freq[index] < 100) { ct_freq[index]++; } | |
| 59 } | |
| 60 | |
| 61 static IntHistogram card_repeat_count(10, 10); | |
| 62 | |
| 63 void ct_freq_update_histo_and_reset() { | |
| 64 for (size_t j = 0; j < ct_freq_sz; j++) { | |
| 65 card_repeat_count.add_entry(ct_freq[j]); | |
| 66 ct_freq[j] = 0; | |
| 67 } | |
| 68 | |
| 69 } | |
| 70 #endif | |
| 71 | |
| 1861 | 72 G1RemSet::G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs) |
| 73 : _g1(g1), _conc_refine_cards(0), | |
| 74 _ct_bs(ct_bs), _g1p(_g1->g1_policy()), | |
| 342 | 75 _cg1r(g1->concurrent_g1_refine()), |
| 1705 | 76 _cset_rs_update_cl(NULL), |
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77 _cards_scanned(NULL), _total_cards_scanned(0), |
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78 _prev_period_summary() |
| 342 | 79 { |
| 80 _seq_task = new SubTasksDone(NumSeqTasks); | |
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81 guarantee(n_workers() > 0, "There should be some workers"); |
| 6197 | 82 _cset_rs_update_cl = NEW_C_HEAP_ARRAY(OopsInHeapRegionClosure*, n_workers(), mtGC); |
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83 for (uint i = 0; i < n_workers(); i++) { |
| 1705 | 84 _cset_rs_update_cl[i] = NULL; |
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85 } |
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86 if (G1SummarizeRSetStats) { |
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87 _prev_period_summary.initialize(this); |
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88 } |
| 342 | 89 } |
| 90 | |
| 1861 | 91 G1RemSet::~G1RemSet() { |
| 342 | 92 delete _seq_task; |
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93 for (uint i = 0; i < n_workers(); i++) { |
| 1705 | 94 assert(_cset_rs_update_cl[i] == NULL, "it should be"); |
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95 } |
| 6197 | 96 FREE_C_HEAP_ARRAY(OopsInHeapRegionClosure*, _cset_rs_update_cl, mtGC); |
| 342 | 97 } |
| 98 | |
| 99 void CountNonCleanMemRegionClosure::do_MemRegion(MemRegion mr) { | |
| 100 if (_g1->is_in_g1_reserved(mr.start())) { | |
| 101 _n += (int) ((mr.byte_size() / CardTableModRefBS::card_size)); | |
| 102 if (_start_first == NULL) _start_first = mr.start(); | |
| 103 } | |
| 104 } | |
| 105 | |
| 106 class ScanRSClosure : public HeapRegionClosure { | |
| 107 size_t _cards_done, _cards; | |
| 108 G1CollectedHeap* _g1h; | |
| 12080 | 109 |
| 342 | 110 OopsInHeapRegionClosure* _oc; |
| 12080 | 111 CodeBlobToOopClosure* _code_root_cl; |
| 112 | |
| 342 | 113 G1BlockOffsetSharedArray* _bot_shared; |
| 12343 | 114 G1SATBCardTableModRefBS *_ct_bs; |
| 12080 | 115 |
| 116 double _strong_code_root_scan_time_sec; | |
| 117 int _worker_i; | |
| 118 int _block_size; | |
| 119 bool _try_claimed; | |
| 120 | |
| 342 | 121 public: |
| 12080 | 122 ScanRSClosure(OopsInHeapRegionClosure* oc, |
| 123 CodeBlobToOopClosure* code_root_cl, | |
| 124 int worker_i) : | |
| 342 | 125 _oc(oc), |
| 12080 | 126 _code_root_cl(code_root_cl), |
| 127 _strong_code_root_scan_time_sec(0.0), | |
| 342 | 128 _cards(0), |
| 129 _cards_done(0), | |
| 130 _worker_i(worker_i), | |
| 131 _try_claimed(false) | |
| 132 { | |
| 133 _g1h = G1CollectedHeap::heap(); | |
| 134 _bot_shared = _g1h->bot_shared(); | |
| 12343 | 135 _ct_bs = _g1h->g1_barrier_set(); |
| 1261 | 136 _block_size = MAX2<int>(G1RSetScanBlockSize, 1); |
| 342 | 137 } |
| 138 | |
| 139 void set_try_claimed() { _try_claimed = true; } | |
| 140 | |
| 141 void scanCard(size_t index, HeapRegion *r) { | |
| 4023 | 142 // Stack allocate the DirtyCardToOopClosure instance |
| 143 HeapRegionDCTOC cl(_g1h, r, _oc, | |
| 144 CardTableModRefBS::Precise, | |
| 145 HeapRegionDCTOC::IntoCSFilterKind); | |
| 342 | 146 |
| 147 // Set the "from" region in the closure. | |
| 148 _oc->set_region(r); | |
| 149 HeapWord* card_start = _bot_shared->address_for_index(index); | |
| 150 HeapWord* card_end = card_start + G1BlockOffsetSharedArray::N_words; | |
| 151 Space *sp = SharedHeap::heap()->space_containing(card_start); | |
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152 MemRegion sm_region = sp->used_region_at_save_marks(); |
| 342 | 153 MemRegion mr = sm_region.intersection(MemRegion(card_start,card_end)); |
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154 if (!mr.is_empty() && !_ct_bs->is_card_claimed(index)) { |
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155 // We make the card as "claimed" lazily (so races are possible |
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156 // but they're benign), which reduces the number of duplicate |
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157 // scans (the rsets of the regions in the cset can intersect). |
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158 _ct_bs->set_card_claimed(index); |
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159 _cards_done++; |
| 4023 | 160 cl.do_MemRegion(mr); |
| 342 | 161 } |
| 162 } | |
| 163 | |
| 164 void printCard(HeapRegion* card_region, size_t card_index, | |
| 165 HeapWord* card_start) { | |
| 166 gclog_or_tty->print_cr("T %d Region [" PTR_FORMAT ", " PTR_FORMAT ") " | |
| 167 "RS names card %p: " | |
| 168 "[" PTR_FORMAT ", " PTR_FORMAT ")", | |
| 169 _worker_i, | |
| 170 card_region->bottom(), card_region->end(), | |
| 171 card_index, | |
| 172 card_start, card_start + G1BlockOffsetSharedArray::N_words); | |
| 173 } | |
| 174 | |
| 12080 | 175 void scan_strong_code_roots(HeapRegion* r) { |
| 176 double scan_start = os::elapsedTime(); | |
| 177 r->strong_code_roots_do(_code_root_cl); | |
| 178 _strong_code_root_scan_time_sec += (os::elapsedTime() - scan_start); | |
| 179 } | |
| 180 | |
| 342 | 181 bool doHeapRegion(HeapRegion* r) { |
| 182 assert(r->in_collection_set(), "should only be called on elements of CS."); | |
| 183 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 184 if (hrrs->iter_is_complete()) return false; // All done. | |
| 185 if (!_try_claimed && !hrrs->claim_iter()) return false; | |
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186 // If we ever free the collection set concurrently, we should also |
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187 // clear the card table concurrently therefore we won't need to |
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188 // add regions of the collection set to the dirty cards region. |
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189 _g1h->push_dirty_cards_region(r); |
| 342 | 190 // If we didn't return above, then |
| 191 // _try_claimed || r->claim_iter() | |
| 192 // is true: either we're supposed to work on claimed-but-not-complete | |
| 193 // regions, or we successfully claimed the region. | |
| 12080 | 194 |
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195 HeapRegionRemSetIterator iter(hrrs); |
| 342 | 196 size_t card_index; |
| 1261 | 197 |
| 198 // We claim cards in block so as to recude the contention. The block size is determined by | |
| 199 // the G1RSetScanBlockSize parameter. | |
| 200 size_t jump_to_card = hrrs->iter_claimed_next(_block_size); | |
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201 for (size_t current_card = 0; iter.has_next(card_index); current_card++) { |
| 1261 | 202 if (current_card >= jump_to_card + _block_size) { |
| 203 jump_to_card = hrrs->iter_claimed_next(_block_size); | |
| 747 | 204 } |
| 1261 | 205 if (current_card < jump_to_card) continue; |
| 342 | 206 HeapWord* card_start = _g1h->bot_shared()->address_for_index(card_index); |
| 207 #if 0 | |
| 208 gclog_or_tty->print("Rem set iteration yielded card [" PTR_FORMAT ", " PTR_FORMAT ").\n", | |
| 209 card_start, card_start + CardTableModRefBS::card_size_in_words); | |
| 210 #endif | |
| 211 | |
| 212 HeapRegion* card_region = _g1h->heap_region_containing(card_start); | |
| 213 assert(card_region != NULL, "Yielding cards not in the heap?"); | |
| 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, |
| 244 CodeBlobToOopClosure* code_root_cl, | |
| 245 int 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 {} | |
| 278 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 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 < (int) (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 | |
| 1861 | 299 void G1RemSet::updateRS(DirtyCardQueue* into_cset_dcq, int 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, |
| 12080 | 323 CodeBlobToOopClosure* code_root_cl, |
| 324 int 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 | |
| 331 assert(worker_i < (int)n_workers(), "sanity"); | |
| 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 | |
| 341 // failure the cards/buffers in this queue set are: | |
| 342 // * passed to the DirtyCardQueueSet that is used to manage deferred | |
| 343 // RSet updates, or | |
| 344 // * scanned for references that point into the collection set | |
| 345 // and the RSet of the corresponding region in the collection set | |
| 346 // is updated immediately. | |
| 347 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); | |
| 348 | |
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349 assert((ParallelGCThreads > 0) || worker_i == 0, "invariant"); |
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350 |
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351 // The two flags below were introduced temporarily to serialize |
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352 // the updating and scanning of remembered sets. There are some |
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353 // race conditions when these two operations are done in parallel |
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354 // and they are causing failures. When we resolve said race |
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355 // conditions, we'll revert back to parallel remembered set |
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356 // updating and scanning. See CRs 6677707 and 6677708. |
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357 if (G1UseParallelRSetUpdating || (worker_i == 0)) { |
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358 updateRS(&into_cset_dcq, worker_i); |
| 342 | 359 } else { |
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360 _g1p->phase_times()->record_update_rs_processed_buffers(worker_i, 0); |
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361 _g1p->phase_times()->record_update_rs_time(worker_i, 0.0); |
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362 } |
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363 if (G1UseParallelRSetScanning || (worker_i == 0)) { |
| 12080 | 364 scanRS(oc, code_root_cl, worker_i); |
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365 } else { |
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366 _g1p->phase_times()->record_scan_rs_time(worker_i, 0.0); |
| 342 | 367 } |
| 1705 | 368 |
| 369 // We now clear the cached values of _cset_rs_update_cl for this worker | |
| 370 _cset_rs_update_cl[worker_i] = NULL; | |
| 342 | 371 } |
| 372 | |
| 1861 | 373 void G1RemSet::prepare_for_oops_into_collection_set_do() { |
| 342 | 374 cleanupHRRS(); |
| 375 ConcurrentG1Refine* cg1r = _g1->concurrent_g1_refine(); | |
| 376 _g1->set_refine_cte_cl_concurrency(false); | |
| 377 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 378 dcqs.concatenate_logs(); | |
| 379 | |
| 380 guarantee( _cards_scanned == NULL, "invariant" ); | |
| 6197 | 381 _cards_scanned = NEW_C_HEAP_ARRAY(size_t, n_workers(), mtGC); |
| 545 | 382 for (uint i = 0; i < n_workers(); ++i) { |
| 383 _cards_scanned[i] = 0; | |
| 384 } | |
| 342 | 385 _total_cards_scanned = 0; |
| 386 } | |
| 387 | |
| 388 | |
| 1705 | 389 // This closure, applied to a DirtyCardQueueSet, is used to immediately |
| 390 // update the RSets for the regions in the CSet. For each card it iterates | |
| 391 // through the oops which coincide with that card. It scans the reference | |
| 392 // fields in each oop; when it finds an oop that points into the collection | |
| 393 // set, the RSet for the region containing the referenced object is updated. | |
| 394 class UpdateRSetCardTableEntryIntoCSetClosure: public CardTableEntryClosure { | |
|
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395 G1CollectedHeap* _g1; |
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396 CardTableModRefBS* _ct_bs; |
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397 public: |
| 1705 | 398 UpdateRSetCardTableEntryIntoCSetClosure(G1CollectedHeap* g1, |
| 399 CardTableModRefBS* bs): | |
| 400 _g1(g1), _ct_bs(bs) | |
| 401 { } | |
| 402 | |
| 403 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 404 // Construct the region representing the card. | |
| 405 HeapWord* start = _ct_bs->addr_for(card_ptr); | |
| 406 // And find the region containing it. | |
| 407 HeapRegion* r = _g1->heap_region_containing(start); | |
| 408 assert(r != NULL, "unexpected null"); | |
| 409 | |
| 410 // Scan oops in the card looking for references into the collection set | |
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411 // Don't use addr_for(card_ptr + 1) which can ask for |
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412 // a card beyond the heap. This is not safe without a perm |
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413 // gen. |
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414 HeapWord* end = start + CardTableModRefBS::card_size_in_words; |
| 1705 | 415 MemRegion scanRegion(start, end); |
| 416 | |
| 417 UpdateRSetImmediate update_rs_cl(_g1->g1_rem_set()); | |
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418 FilterIntoCSClosure update_rs_cset_oop_cl(NULL, _g1, &update_rs_cl); |
| 1705 | 419 FilterOutOfRegionClosure filter_then_update_rs_cset_oop_cl(r, &update_rs_cset_oop_cl); |
| 420 | |
| 421 // We can pass false as the "filter_young" parameter here as: | |
| 422 // * we should be in a STW pause, | |
| 423 // * the DCQS to which this closure is applied is used to hold | |
| 424 // references that point into the collection set from the prior | |
| 425 // RSet updating, | |
| 426 // * the post-write barrier shouldn't be logging updates to young | |
| 427 // regions (but there is a situation where this can happen - see | |
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428 // the comment in G1RemSet::refine_card() below - |
| 1705 | 429 // that should not be applicable here), and |
| 430 // * during actual RSet updating, the filtering of cards in young | |
| 431 // regions in HeapRegion::oops_on_card_seq_iterate_careful is | |
| 432 // employed. | |
| 433 // As a result, when this closure is applied to "refs into cset" | |
| 434 // DCQS, we shouldn't see any cards in young regions. | |
| 435 update_rs_cl.set_region(r); | |
| 436 HeapWord* stop_point = | |
| 437 r->oops_on_card_seq_iterate_careful(scanRegion, | |
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438 &filter_then_update_rs_cset_oop_cl, |
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439 false /* filter_young */, |
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440 NULL /* card_ptr */); |
| 1705 | 441 |
| 442 // Since this is performed in the event of an evacuation failure, we | |
| 443 // we shouldn't see a non-null stop point | |
| 444 assert(stop_point == NULL, "saw an unallocated region"); | |
| 445 return true; | |
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446 } |
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447 }; |
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448 |
| 1861 | 449 void G1RemSet::cleanup_after_oops_into_collection_set_do() { |
| 342 | 450 guarantee( _cards_scanned != NULL, "invariant" ); |
| 451 _total_cards_scanned = 0; | |
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452 for (uint i = 0; i < n_workers(); ++i) { |
| 342 | 453 _total_cards_scanned += _cards_scanned[i]; |
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454 } |
| 6197 | 455 FREE_C_HEAP_ARRAY(size_t, _cards_scanned, mtGC); |
| 342 | 456 _cards_scanned = NULL; |
| 457 // Cleanup after copy | |
| 458 _g1->set_refine_cte_cl_concurrency(true); | |
| 459 // Set all cards back to clean. | |
| 460 _g1->cleanUpCardTable(); | |
| 794 | 461 |
| 1705 | 462 DirtyCardQueueSet& into_cset_dcqs = _g1->into_cset_dirty_card_queue_set(); |
| 463 int into_cset_n_buffers = into_cset_dcqs.completed_buffers_num(); | |
| 464 | |
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465 if (_g1->evacuation_failed()) { |
| 1705 | 466 // Restore remembered sets for the regions pointing into the collection set. |
| 467 | |
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468 if (G1DeferredRSUpdate) { |
| 1705 | 469 // If deferred RS updates are enabled then we just need to transfer |
| 470 // the completed buffers from (a) the DirtyCardQueueSet used to hold | |
| 471 // cards that contain references that point into the collection set | |
| 472 // to (b) the DCQS used to hold the deferred RS updates | |
| 473 _g1->dirty_card_queue_set().merge_bufferlists(&into_cset_dcqs); | |
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474 } else { |
| 1705 | 475 |
| 476 CardTableModRefBS* bs = (CardTableModRefBS*)_g1->barrier_set(); | |
| 477 UpdateRSetCardTableEntryIntoCSetClosure update_rs_cset_immediate(_g1, bs); | |
| 478 | |
| 479 int n_completed_buffers = 0; | |
| 480 while (into_cset_dcqs.apply_closure_to_completed_buffer(&update_rs_cset_immediate, | |
| 481 0, 0, true)) { | |
| 482 n_completed_buffers++; | |
| 483 } | |
| 484 assert(n_completed_buffers == into_cset_n_buffers, "missed some buffers"); | |
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485 } |
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486 } |
| 1705 | 487 |
| 488 // Free any completed buffers in the DirtyCardQueueSet used to hold cards | |
| 489 // which contain references that point into the collection. | |
| 490 _g1->into_cset_dirty_card_queue_set().clear(); | |
| 491 assert(_g1->into_cset_dirty_card_queue_set().completed_buffers_num() == 0, | |
| 492 "all buffers should be freed"); | |
| 493 _g1->into_cset_dirty_card_queue_set().clear_n_completed_buffers(); | |
| 342 | 494 } |
| 495 | |
| 496 class ScrubRSClosure: public HeapRegionClosure { | |
| 497 G1CollectedHeap* _g1h; | |
| 498 BitMap* _region_bm; | |
| 499 BitMap* _card_bm; | |
| 500 CardTableModRefBS* _ctbs; | |
| 501 public: | |
| 502 ScrubRSClosure(BitMap* region_bm, BitMap* card_bm) : | |
| 503 _g1h(G1CollectedHeap::heap()), | |
| 504 _region_bm(region_bm), _card_bm(card_bm), | |
| 12343 | 505 _ctbs(_g1h->g1_barrier_set()) {} |
| 342 | 506 |
| 507 bool doHeapRegion(HeapRegion* r) { | |
| 508 if (!r->continuesHumongous()) { | |
| 509 r->rem_set()->scrub(_ctbs, _region_bm, _card_bm); | |
| 510 } | |
| 511 return false; | |
| 512 } | |
| 513 }; | |
| 514 | |
| 1861 | 515 void G1RemSet::scrub(BitMap* region_bm, BitMap* card_bm) { |
| 342 | 516 ScrubRSClosure scrub_cl(region_bm, card_bm); |
| 517 _g1->heap_region_iterate(&scrub_cl); | |
| 518 } | |
| 519 | |
| 1861 | 520 void G1RemSet::scrub_par(BitMap* region_bm, BitMap* card_bm, |
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521 uint worker_num, int claim_val) { |
| 342 | 522 ScrubRSClosure scrub_cl(region_bm, card_bm); |
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523 _g1->heap_region_par_iterate_chunked(&scrub_cl, |
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524 worker_num, |
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525 n_workers(), |
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526 claim_val); |
| 342 | 527 } |
| 528 | |
| 4839 | 529 G1TriggerClosure::G1TriggerClosure() : |
| 530 _triggered(false) { } | |
| 531 | |
| 532 G1InvokeIfNotTriggeredClosure::G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t_cl, | |
| 533 OopClosure* oop_cl) : | |
| 534 _trigger_cl(t_cl), _oop_cl(oop_cl) { } | |
| 1705 | 535 |
| 4839 | 536 G1Mux2Closure::G1Mux2Closure(OopClosure *c1, OopClosure *c2) : |
| 537 _c1(c1), _c2(c2) { } | |
| 1705 | 538 |
| 4839 | 539 G1UpdateRSOrPushRefOopClosure:: |
| 540 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h, | |
| 541 G1RemSet* rs, | |
| 542 OopsInHeapRegionClosure* push_ref_cl, | |
| 543 bool record_refs_into_cset, | |
| 544 int worker_i) : | |
| 545 _g1(g1h), _g1_rem_set(rs), _from(NULL), | |
| 546 _record_refs_into_cset(record_refs_into_cset), | |
| 547 _push_ref_cl(push_ref_cl), _worker_i(worker_i) { } | |
| 1705 | 548 |
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549 // Returns true if the given card contains references that point |
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550 // into the collection set, if we're checking for such references; |
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551 // false otherwise. |
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552 |
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553 bool G1RemSet::refine_card(jbyte* card_ptr, int worker_i, |
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554 bool check_for_refs_into_cset) { |
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555 |
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556 // If the card is no longer dirty, nothing to do. |
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557 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
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558 // No need to return that this card contains refs that point |
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559 // into the collection set. |
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560 return false; |
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561 } |
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562 |
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563 // Construct the region representing the card. |
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564 HeapWord* start = _ct_bs->addr_for(card_ptr); |
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565 // And find the region containing it. |
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566 HeapRegion* r = _g1->heap_region_containing(start); |
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567 if (r == NULL) { |
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568 // Again no need to return that this card contains refs that |
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569 // point into the collection set. |
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570 return false; // Not in the G1 heap (might be in perm, for example.) |
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571 } |
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572 |
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573 // Why do we have to check here whether a card is on a young region, |
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574 // given that we dirty young regions and, as a result, the |
|
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575 // post-barrier is supposed to filter them out and never to enqueue |
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576 // them? When we allocate a new region as the "allocation region" we |
|
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577 // actually dirty its cards after we release the lock, since card |
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578 // dirtying while holding the lock was a performance bottleneck. So, |
|
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579 // as a result, it is possible for other threads to actually |
|
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580 // allocate objects in the region (after the acquire the lock) |
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581 // before all the cards on the region are dirtied. This is unlikely, |
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582 // and it doesn't happen often, but it can happen. So, the extra |
|
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583 // check below filters out those cards. |
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584 if (r->is_young()) { |
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585 return false; |
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586 } |
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587 |
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588 // While we are processing RSet buffers during the collection, we |
|
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589 // actually don't want to scan any cards on the collection set, |
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590 // since we don't want to update remebered sets with entries that |
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591 // point into the collection set, given that live objects from the |
|
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592 // collection set are about to move and such entries will be stale |
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593 // very soon. This change also deals with a reliability issue which |
|
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594 // involves scanning a card in the collection set and coming across |
|
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595 // an array that was being chunked and looking malformed. Note, |
|
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596 // however, that if evacuation fails, we have to scan any objects |
|
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597 // that were not moved and create any missing entries. |
|
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598 if (r->in_collection_set()) { |
|
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599 return false; |
|
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600 } |
|
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601 |
|
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|
602 // The result from the hot card cache insert call is either: |
|
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603 // * pointer to the current card |
|
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604 // (implying that the current card is not 'hot'), |
|
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605 // * null |
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606 // (meaning we had inserted the card ptr into the "hot" card cache, |
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607 // which had some headroom), |
|
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608 // * a pointer to a "hot" card that was evicted from the "hot" cache. |
|
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609 // |
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610 |
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611 G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
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612 if (hot_card_cache->use_cache()) { |
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613 assert(!check_for_refs_into_cset, "sanity"); |
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614 assert(!SafepointSynchronize::is_at_safepoint(), "sanity"); |
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615 |
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616 card_ptr = hot_card_cache->insert(card_ptr); |
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617 if (card_ptr == NULL) { |
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618 // There was no eviction. Nothing to do. |
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619 return false; |
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620 } |
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621 |
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622 start = _ct_bs->addr_for(card_ptr); |
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623 r = _g1->heap_region_containing(start); |
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624 if (r == NULL) { |
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625 // Not in the G1 heap |
|
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|
626 return false; |
|
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|
627 } |
|
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|
628 |
|
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|
629 // Checking whether the region we got back from the cache |
|
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|
630 // is young here is inappropriate. The region could have been |
|
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631 // freed, reallocated and tagged as young while in the cache. |
|
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632 // Hence we could see its young type change at any time. |
|
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|
633 } |
|
890
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|
634 |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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635 // Don't use addr_for(card_ptr + 1) which can ask for |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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636 // a card beyond the heap. This is not safe without a perm |
|
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637 // gen at the upper end of the heap. |
|
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|
638 HeapWord* end = start + CardTableModRefBS::card_size_in_words; |
|
890
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639 MemRegion dirtyRegion(start, end); |
|
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|
640 |
|
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|
641 #if CARD_REPEAT_HISTO |
|
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
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|
642 init_ct_freq_table(_g1->max_capacity()); |
|
890
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643 ct_freq_note_card(_ct_bs->index_for(start)); |
|
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644 #endif |
|
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|
645 |
|
4071
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7106751: G1: gc/gctests/nativeGC03 crashes VM with SIGSEGV
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646 OopsInHeapRegionClosure* oops_in_heap_closure = NULL; |
|
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647 if (check_for_refs_into_cset) { |
|
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648 // ConcurrentG1RefineThreads have worker numbers larger than what |
|
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649 // _cset_rs_update_cl[] is set up to handle. But those threads should |
|
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650 // only be active outside of a collection which means that when they |
|
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|
651 // reach here they should have check_for_refs_into_cset == false. |
|
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|
652 assert((size_t)worker_i < n_workers(), "index of worker larger than _cset_rs_update_cl[].length"); |
|
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653 oops_in_heap_closure = _cset_rs_update_cl[worker_i]; |
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|
654 } |
| 4839 | 655 G1UpdateRSOrPushRefOopClosure update_rs_oop_cl(_g1, |
| 656 _g1->g1_rem_set(), | |
| 657 oops_in_heap_closure, | |
| 658 check_for_refs_into_cset, | |
| 659 worker_i); | |
|
890
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660 update_rs_oop_cl.set_from(r); |
| 1705 | 661 |
| 4839 | 662 G1TriggerClosure trigger_cl; |
|
3983
811ec3d0833b
7097053: G1: assert(da ? referent->is_oop() : referent->is_oop_or_null()) failed: referenceProcessor.cpp:1054
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|
663 FilterIntoCSClosure into_cs_cl(NULL, _g1, &trigger_cl); |
| 4839 | 664 G1InvokeIfNotTriggeredClosure invoke_cl(&trigger_cl, &into_cs_cl); |
| 665 G1Mux2Closure mux(&invoke_cl, &update_rs_oop_cl); | |
| 1705 | 666 |
| 667 FilterOutOfRegionClosure filter_then_update_rs_oop_cl(r, | |
| 668 (check_for_refs_into_cset ? | |
| 669 (OopClosure*)&mux : | |
| 670 (OopClosure*)&update_rs_oop_cl)); | |
|
890
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|
671 |
|
1666
5cbac8938c4c
6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
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|
672 // The region for the current card may be a young region. The |
|
5cbac8938c4c
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|
673 // current card may have been a card that was evicted from the |
|
5cbac8938c4c
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|
674 // card cache. When the card was inserted into the cache, we had |
|
5cbac8938c4c
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diff
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|
675 // determined that its region was non-young. While in the cache, |
|
5cbac8938c4c
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|
676 // the region may have been freed during a cleanup pause, reallocated |
|
5cbac8938c4c
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|
677 // and tagged as young. |
|
5cbac8938c4c
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|
678 // |
|
5cbac8938c4c
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diff
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|
679 // We wish to filter out cards for such a region but the current |
|
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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2364
diff
changeset
|
680 // thread, if we're running concurrently, may "see" the young type |
|
1666
5cbac8938c4c
6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
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diff
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|
681 // change at any time (so an earlier "is_young" check may pass or |
|
5cbac8938c4c
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diff
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|
682 // fail arbitrarily). We tell the iteration code to perform this |
|
5cbac8938c4c
6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
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|
683 // filtering when it has been determined that there has been an actual |
|
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684 // allocation in this region and making it safe to check the young type. |
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685 bool filter_young = true; |
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686 |
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687 HeapWord* stop_point = |
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688 r->oops_on_card_seq_iterate_careful(dirtyRegion, |
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689 &filter_then_update_rs_oop_cl, |
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690 filter_young, |
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691 card_ptr); |
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692 |
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693 // If stop_point is non-null, then we encountered an unallocated region |
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694 // (perhaps the unfilled portion of a TLAB.) For now, we'll dirty the |
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695 // card and re-enqueue: if we put off the card until a GC pause, then the |
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696 // unallocated portion will be filled in. Alternatively, we might try |
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697 // the full complexity of the technique used in "regular" precleaning. |
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698 if (stop_point != NULL) { |
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699 // The card might have gotten re-dirtied and re-enqueued while we |
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700 // worked. (In fact, it's pretty likely.) |
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701 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
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702 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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703 MutexLockerEx x(Shared_DirtyCardQ_lock, |
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704 Mutex::_no_safepoint_check_flag); |
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705 DirtyCardQueue* sdcq = |
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706 JavaThread::dirty_card_queue_set().shared_dirty_card_queue(); |
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707 sdcq->enqueue(card_ptr); |
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708 } |
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709 } else { |
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710 _conc_refine_cards++; |
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711 } |
| 1705 | 712 |
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713 // This gets set to true if the card being refined has |
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714 // references that point into the collection set. |
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715 bool has_refs_into_cset = trigger_cl.triggered(); |
| 342 | 716 |
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717 // We should only be detecting that the card contains references |
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718 // that point into the collection set if the current thread is |
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719 // a GC worker thread. |
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720 assert(!has_refs_into_cset || SafepointSynchronize::is_at_safepoint(), |
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721 "invalid result at non safepoint"); |
| 1705 | 722 |
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723 return has_refs_into_cset; |
| 342 | 724 } |
| 725 | |
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726 void G1RemSet::print_periodic_summary_info(const char* header) { |
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727 G1RemSetSummary current; |
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728 current.initialize(this); |
| 342 | 729 |
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730 _prev_period_summary.subtract_from(¤t); |
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731 print_summary_info(&_prev_period_summary, header); |
| 342 | 732 |
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733 _prev_period_summary.set(¤t); |
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734 } |
| 794 | 735 |
| 1861 | 736 void G1RemSet::print_summary_info() { |
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737 G1RemSetSummary current; |
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738 current.initialize(this); |
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739 |
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740 print_summary_info(¤t, " Cumulative RS summary"); |
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741 } |
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742 |
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743 void G1RemSet::print_summary_info(G1RemSetSummary * summary, const char * header) { |
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744 assert(summary != NULL, "just checking"); |
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745 |
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746 if (header != NULL) { |
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747 gclog_or_tty->print_cr("%s", header); |
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748 } |
| 342 | 749 |
| 750 #if CARD_REPEAT_HISTO | |
| 751 gclog_or_tty->print_cr("\nG1 card_repeat count histogram: "); | |
| 752 gclog_or_tty->print_cr(" # of repeats --> # of cards with that number."); | |
| 753 card_repeat_count.print_on(gclog_or_tty); | |
| 754 #endif | |
| 755 | |
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756 summary->print_on(gclog_or_tty); |
| 342 | 757 } |
| 1705 | 758 |
| 1861 | 759 void G1RemSet::prepare_for_verify() { |
|
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760 if (G1HRRSFlushLogBuffersOnVerify && |
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761 (VerifyBeforeGC || VerifyAfterGC) |
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762 && (!_g1->full_collection() || G1VerifyRSetsDuringFullGC)) { |
| 342 | 763 cleanupHRRS(); |
| 764 _g1->set_refine_cte_cl_concurrency(false); | |
| 765 if (SafepointSynchronize::is_at_safepoint()) { | |
| 766 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 767 dcqs.concatenate_logs(); | |
| 768 } | |
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769 |
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770 G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
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771 bool use_hot_card_cache = hot_card_cache->use_cache(); |
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772 hot_card_cache->set_use_cache(false); |
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773 |
| 1705 | 774 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); |
| 775 updateRS(&into_cset_dcq, 0); | |
| 776 _g1->into_cset_dirty_card_queue_set().clear(); | |
|
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777 |
|
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778 hot_card_cache->set_use_cache(use_hot_card_cache); |
|
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779 assert(JavaThread::dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
| 342 | 780 } |
| 781 } |