Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1RemSet.cpp @ 10182:5c93c1f61226
8011724: G1: Stack allocate instances of HeapRegionRemSetIterator
Summary: Stack allocate instances of HeapRegionRemSetIterator during RSet scanning.
Reviewed-by: brutisso, jwilhelm
| author | johnc |
|---|---|
| date | Thu, 18 Apr 2013 10:09:23 -0700 |
| parents | da91efe96a93 |
| children | 194f52aa2f23 |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 4839 | 2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "gc_implementation/g1/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/g1GCPhaseTimes.hpp" |
| 1972 | 33 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
| 34 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
| 35 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
| 36 #include "memory/iterator.hpp" | |
| 37 #include "oops/oop.inline.hpp" | |
| 38 #include "utilities/intHisto.hpp" | |
| 342 | 39 |
| 40 #define CARD_REPEAT_HISTO 0 | |
| 41 | |
| 42 #if CARD_REPEAT_HISTO | |
| 43 static size_t ct_freq_sz; | |
| 44 static jbyte* ct_freq = NULL; | |
| 45 | |
| 46 void init_ct_freq_table(size_t heap_sz_bytes) { | |
| 47 if (ct_freq == NULL) { | |
| 48 ct_freq_sz = heap_sz_bytes/CardTableModRefBS::card_size; | |
| 49 ct_freq = new jbyte[ct_freq_sz]; | |
| 50 for (size_t j = 0; j < ct_freq_sz; j++) ct_freq[j] = 0; | |
| 51 } | |
| 52 } | |
| 53 | |
| 54 void ct_freq_note_card(size_t index) { | |
| 55 assert(0 <= index && index < ct_freq_sz, "Bounds error."); | |
| 56 if (ct_freq[index] < 100) { ct_freq[index]++; } | |
| 57 } | |
| 58 | |
| 59 static IntHistogram card_repeat_count(10, 10); | |
| 60 | |
| 61 void ct_freq_update_histo_and_reset() { | |
| 62 for (size_t j = 0; j < ct_freq_sz; j++) { | |
| 63 card_repeat_count.add_entry(ct_freq[j]); | |
| 64 ct_freq[j] = 0; | |
| 65 } | |
| 66 | |
| 67 } | |
| 68 #endif | |
| 69 | |
| 1861 | 70 G1RemSet::G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs) |
| 71 : _g1(g1), _conc_refine_cards(0), | |
| 72 _ct_bs(ct_bs), _g1p(_g1->g1_policy()), | |
| 342 | 73 _cg1r(g1->concurrent_g1_refine()), |
| 1705 | 74 _cset_rs_update_cl(NULL), |
| 342 | 75 _cards_scanned(NULL), _total_cards_scanned(0) |
| 76 { | |
| 77 _seq_task = new SubTasksDone(NumSeqTasks); | |
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78 guarantee(n_workers() > 0, "There should be some workers"); |
| 6197 | 79 _cset_rs_update_cl = NEW_C_HEAP_ARRAY(OopsInHeapRegionClosure*, n_workers(), mtGC); |
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80 for (uint i = 0; i < n_workers(); i++) { |
| 1705 | 81 _cset_rs_update_cl[i] = NULL; |
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82 } |
| 342 | 83 } |
| 84 | |
| 1861 | 85 G1RemSet::~G1RemSet() { |
| 342 | 86 delete _seq_task; |
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87 for (uint i = 0; i < n_workers(); i++) { |
| 1705 | 88 assert(_cset_rs_update_cl[i] == NULL, "it should be"); |
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89 } |
| 6197 | 90 FREE_C_HEAP_ARRAY(OopsInHeapRegionClosure*, _cset_rs_update_cl, mtGC); |
| 342 | 91 } |
| 92 | |
| 93 void CountNonCleanMemRegionClosure::do_MemRegion(MemRegion mr) { | |
| 94 if (_g1->is_in_g1_reserved(mr.start())) { | |
| 95 _n += (int) ((mr.byte_size() / CardTableModRefBS::card_size)); | |
| 96 if (_start_first == NULL) _start_first = mr.start(); | |
| 97 } | |
| 98 } | |
| 99 | |
| 100 class ScanRSClosure : public HeapRegionClosure { | |
| 101 size_t _cards_done, _cards; | |
| 102 G1CollectedHeap* _g1h; | |
| 103 OopsInHeapRegionClosure* _oc; | |
| 104 G1BlockOffsetSharedArray* _bot_shared; | |
| 105 CardTableModRefBS *_ct_bs; | |
| 106 int _worker_i; | |
| 1261 | 107 int _block_size; |
| 342 | 108 bool _try_claimed; |
| 109 public: | |
| 110 ScanRSClosure(OopsInHeapRegionClosure* oc, int worker_i) : | |
| 111 _oc(oc), | |
| 112 _cards(0), | |
| 113 _cards_done(0), | |
| 114 _worker_i(worker_i), | |
| 115 _try_claimed(false) | |
| 116 { | |
| 117 _g1h = G1CollectedHeap::heap(); | |
| 118 _bot_shared = _g1h->bot_shared(); | |
| 119 _ct_bs = (CardTableModRefBS*) (_g1h->barrier_set()); | |
| 1261 | 120 _block_size = MAX2<int>(G1RSetScanBlockSize, 1); |
| 342 | 121 } |
| 122 | |
| 123 void set_try_claimed() { _try_claimed = true; } | |
| 124 | |
| 125 void scanCard(size_t index, HeapRegion *r) { | |
| 4023 | 126 // Stack allocate the DirtyCardToOopClosure instance |
| 127 HeapRegionDCTOC cl(_g1h, r, _oc, | |
| 128 CardTableModRefBS::Precise, | |
| 129 HeapRegionDCTOC::IntoCSFilterKind); | |
| 342 | 130 |
| 131 // Set the "from" region in the closure. | |
| 132 _oc->set_region(r); | |
| 133 HeapWord* card_start = _bot_shared->address_for_index(index); | |
| 134 HeapWord* card_end = card_start + G1BlockOffsetSharedArray::N_words; | |
| 135 Space *sp = SharedHeap::heap()->space_containing(card_start); | |
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136 MemRegion sm_region = sp->used_region_at_save_marks(); |
| 342 | 137 MemRegion mr = sm_region.intersection(MemRegion(card_start,card_end)); |
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138 if (!mr.is_empty() && !_ct_bs->is_card_claimed(index)) { |
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139 // We make the card as "claimed" lazily (so races are possible |
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140 // but they're benign), which reduces the number of duplicate |
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141 // scans (the rsets of the regions in the cset can intersect). |
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142 _ct_bs->set_card_claimed(index); |
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143 _cards_done++; |
| 4023 | 144 cl.do_MemRegion(mr); |
| 342 | 145 } |
| 146 } | |
| 147 | |
| 148 void printCard(HeapRegion* card_region, size_t card_index, | |
| 149 HeapWord* card_start) { | |
| 150 gclog_or_tty->print_cr("T %d Region [" PTR_FORMAT ", " PTR_FORMAT ") " | |
| 151 "RS names card %p: " | |
| 152 "[" PTR_FORMAT ", " PTR_FORMAT ")", | |
| 153 _worker_i, | |
| 154 card_region->bottom(), card_region->end(), | |
| 155 card_index, | |
| 156 card_start, card_start + G1BlockOffsetSharedArray::N_words); | |
| 157 } | |
| 158 | |
| 159 bool doHeapRegion(HeapRegion* r) { | |
| 160 assert(r->in_collection_set(), "should only be called on elements of CS."); | |
| 161 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 162 if (hrrs->iter_is_complete()) return false; // All done. | |
| 163 if (!_try_claimed && !hrrs->claim_iter()) return false; | |
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164 // If we ever free the collection set concurrently, we should also |
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165 // clear the card table concurrently therefore we won't need to |
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166 // add regions of the collection set to the dirty cards region. |
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167 _g1h->push_dirty_cards_region(r); |
| 342 | 168 // If we didn't return above, then |
| 169 // _try_claimed || r->claim_iter() | |
| 170 // is true: either we're supposed to work on claimed-but-not-complete | |
| 171 // regions, or we successfully claimed the region. | |
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172 HeapRegionRemSetIterator iter(hrrs); |
| 342 | 173 size_t card_index; |
| 1261 | 174 |
| 175 // We claim cards in block so as to recude the contention. The block size is determined by | |
| 176 // the G1RSetScanBlockSize parameter. | |
| 177 size_t jump_to_card = hrrs->iter_claimed_next(_block_size); | |
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178 for (size_t current_card = 0; iter.has_next(card_index); current_card++) { |
| 1261 | 179 if (current_card >= jump_to_card + _block_size) { |
| 180 jump_to_card = hrrs->iter_claimed_next(_block_size); | |
| 747 | 181 } |
| 1261 | 182 if (current_card < jump_to_card) continue; |
| 342 | 183 HeapWord* card_start = _g1h->bot_shared()->address_for_index(card_index); |
| 184 #if 0 | |
| 185 gclog_or_tty->print("Rem set iteration yielded card [" PTR_FORMAT ", " PTR_FORMAT ").\n", | |
| 186 card_start, card_start + CardTableModRefBS::card_size_in_words); | |
| 187 #endif | |
| 188 | |
| 189 HeapRegion* card_region = _g1h->heap_region_containing(card_start); | |
| 190 assert(card_region != NULL, "Yielding cards not in the heap?"); | |
| 191 _cards++; | |
| 192 | |
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193 if (!card_region->is_on_dirty_cards_region_list()) { |
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194 _g1h->push_dirty_cards_region(card_region); |
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195 } |
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196 |
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197 // If the card is dirty, then we will scan it during updateRS. |
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198 if (!card_region->in_collection_set() && |
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199 !_ct_bs->is_card_dirty(card_index)) { |
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200 scanCard(card_index, card_region); |
| 342 | 201 } |
| 202 } | |
| 747 | 203 if (!_try_claimed) { |
| 204 hrrs->set_iter_complete(); | |
| 205 } | |
| 342 | 206 return false; |
| 207 } | |
| 208 size_t cards_done() { return _cards_done;} | |
| 209 size_t cards_looked_up() { return _cards;} | |
| 210 }; | |
| 211 | |
| 1861 | 212 void G1RemSet::scanRS(OopsInHeapRegionClosure* oc, int worker_i) { |
| 342 | 213 double rs_time_start = os::elapsedTime(); |
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214 HeapRegion *startRegion = _g1->start_cset_region_for_worker(worker_i); |
| 342 | 215 |
| 1261 | 216 ScanRSClosure scanRScl(oc, worker_i); |
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217 |
| 342 | 218 _g1->collection_set_iterate_from(startRegion, &scanRScl); |
| 219 scanRScl.set_try_claimed(); | |
| 220 _g1->collection_set_iterate_from(startRegion, &scanRScl); | |
| 221 | |
| 1261 | 222 double scan_rs_time_sec = os::elapsedTime() - rs_time_start; |
| 342 | 223 |
| 224 assert( _cards_scanned != NULL, "invariant" ); | |
| 225 _cards_scanned[worker_i] = scanRScl.cards_done(); | |
| 226 | |
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227 _g1p->phase_times()->record_scan_rs_time(worker_i, scan_rs_time_sec * 1000.0); |
| 342 | 228 } |
| 229 | |
| 1705 | 230 // Closure used for updating RSets and recording references that |
| 231 // point into the collection set. Only called during an | |
| 232 // evacuation pause. | |
| 233 | |
| 234 class RefineRecordRefsIntoCSCardTableEntryClosure: public CardTableEntryClosure { | |
| 235 G1RemSet* _g1rs; | |
| 236 DirtyCardQueue* _into_cset_dcq; | |
| 237 public: | |
| 238 RefineRecordRefsIntoCSCardTableEntryClosure(G1CollectedHeap* g1h, | |
| 239 DirtyCardQueue* into_cset_dcq) : | |
| 240 _g1rs(g1h->g1_rem_set()), _into_cset_dcq(into_cset_dcq) | |
| 241 {} | |
| 242 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 243 // The only time we care about recording cards that | |
| 244 // contain references that point into the collection set | |
| 245 // is during RSet updating within an evacuation pause. | |
| 246 // In this case worker_i should be the id of a GC worker thread. | |
| 247 assert(SafepointSynchronize::is_at_safepoint(), "not during an evacuation pause"); | |
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248 assert(worker_i < (int) (ParallelGCThreads == 0 ? 1 : ParallelGCThreads), "should be a GC worker"); |
| 342 | 249 |
| 1705 | 250 if (_g1rs->concurrentRefineOneCard(card_ptr, worker_i, true)) { |
| 251 // 'card_ptr' contains references that point into the collection | |
| 252 // set. We need to record the card in the DCQS | |
| 253 // (G1CollectedHeap::into_cset_dirty_card_queue_set()) | |
| 254 // that's used for that purpose. | |
| 255 // | |
| 256 // Enqueue the card | |
| 257 _into_cset_dcq->enqueue(card_ptr); | |
| 258 } | |
| 259 return true; | |
| 260 } | |
| 261 }; | |
| 262 | |
| 1861 | 263 void G1RemSet::updateRS(DirtyCardQueue* into_cset_dcq, int worker_i) { |
| 342 | 264 double start = os::elapsedTime(); |
| 1705 | 265 // Apply the given closure to all remaining log entries. |
| 266 RefineRecordRefsIntoCSCardTableEntryClosure into_cset_update_rs_cl(_g1, into_cset_dcq); | |
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267 |
| 1705 | 268 _g1->iterate_dirty_card_closure(&into_cset_update_rs_cl, into_cset_dcq, false, worker_i); |
| 269 | |
| 794 | 270 // Now there should be no dirty cards. |
| 271 if (G1RSLogCheckCardTable) { | |
| 272 CountNonCleanMemRegionClosure cl(_g1); | |
| 273 _ct_bs->mod_card_iterate(&cl); | |
| 274 // XXX This isn't true any more: keeping cards of young regions | |
| 275 // marked dirty broke it. Need some reasonable fix. | |
| 276 guarantee(cl.n() == 0, "Card table should be clean."); | |
| 342 | 277 } |
| 794 | 278 |
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279 _g1p->phase_times()->record_update_rs_time(worker_i, (os::elapsedTime() - start) * 1000.0); |
| 342 | 280 } |
| 281 | |
| 1861 | 282 void G1RemSet::cleanupHRRS() { |
| 342 | 283 HeapRegionRemSet::cleanup(); |
| 284 } | |
| 285 | |
| 1861 | 286 void G1RemSet::oops_into_collection_set_do(OopsInHeapRegionClosure* oc, |
| 342 | 287 int worker_i) { |
| 288 #if CARD_REPEAT_HISTO | |
| 289 ct_freq_update_histo_and_reset(); | |
| 290 #endif | |
| 291 if (worker_i == 0) { | |
| 292 _cg1r->clear_and_record_card_counts(); | |
| 293 } | |
| 294 | |
| 1705 | 295 // We cache the value of 'oc' closure into the appropriate slot in the |
| 296 // _cset_rs_update_cl for this worker | |
| 297 assert(worker_i < (int)n_workers(), "sanity"); | |
| 298 _cset_rs_update_cl[worker_i] = oc; | |
| 299 | |
| 300 // A DirtyCardQueue that is used to hold cards containing references | |
| 301 // that point into the collection set. This DCQ is associated with a | |
| 302 // special DirtyCardQueueSet (see g1CollectedHeap.hpp). Under normal | |
| 303 // circumstances (i.e. the pause successfully completes), these cards | |
| 304 // are just discarded (there's no need to update the RSets of regions | |
| 305 // that were in the collection set - after the pause these regions | |
| 306 // are wholly 'free' of live objects. In the event of an evacuation | |
| 307 // failure the cards/buffers in this queue set are: | |
| 308 // * passed to the DirtyCardQueueSet that is used to manage deferred | |
| 309 // RSet updates, or | |
| 310 // * scanned for references that point into the collection set | |
| 311 // and the RSet of the corresponding region in the collection set | |
| 312 // is updated immediately. | |
| 313 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); | |
| 314 | |
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315 assert((ParallelGCThreads > 0) || worker_i == 0, "invariant"); |
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316 |
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317 // The two flags below were introduced temporarily to serialize |
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318 // the updating and scanning of remembered sets. There are some |
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319 // race conditions when these two operations are done in parallel |
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320 // and they are causing failures. When we resolve said race |
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321 // conditions, we'll revert back to parallel remembered set |
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322 // updating and scanning. See CRs 6677707 and 6677708. |
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323 if (G1UseParallelRSetUpdating || (worker_i == 0)) { |
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324 updateRS(&into_cset_dcq, worker_i); |
| 342 | 325 } else { |
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326 _g1p->phase_times()->record_update_rs_processed_buffers(worker_i, 0); |
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327 _g1p->phase_times()->record_update_rs_time(worker_i, 0.0); |
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328 } |
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329 if (G1UseParallelRSetScanning || (worker_i == 0)) { |
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330 scanRS(oc, worker_i); |
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331 } else { |
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332 _g1p->phase_times()->record_scan_rs_time(worker_i, 0.0); |
| 342 | 333 } |
| 1705 | 334 |
| 335 // We now clear the cached values of _cset_rs_update_cl for this worker | |
| 336 _cset_rs_update_cl[worker_i] = NULL; | |
| 342 | 337 } |
| 338 | |
| 1861 | 339 void G1RemSet::prepare_for_oops_into_collection_set_do() { |
| 342 | 340 cleanupHRRS(); |
| 341 ConcurrentG1Refine* cg1r = _g1->concurrent_g1_refine(); | |
| 342 _g1->set_refine_cte_cl_concurrency(false); | |
| 343 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 344 dcqs.concatenate_logs(); | |
| 345 | |
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346 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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347 // Don't set the number of workers here. It will be set |
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348 // when the task is run |
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349 // _seq_task->set_n_termination((int)n_workers()); |
| 342 | 350 } |
| 351 guarantee( _cards_scanned == NULL, "invariant" ); | |
| 6197 | 352 _cards_scanned = NEW_C_HEAP_ARRAY(size_t, n_workers(), mtGC); |
| 545 | 353 for (uint i = 0; i < n_workers(); ++i) { |
| 354 _cards_scanned[i] = 0; | |
| 355 } | |
| 342 | 356 _total_cards_scanned = 0; |
| 357 } | |
| 358 | |
| 359 | |
| 1705 | 360 // This closure, applied to a DirtyCardQueueSet, is used to immediately |
| 361 // update the RSets for the regions in the CSet. For each card it iterates | |
| 362 // through the oops which coincide with that card. It scans the reference | |
| 363 // fields in each oop; when it finds an oop that points into the collection | |
| 364 // set, the RSet for the region containing the referenced object is updated. | |
| 365 class UpdateRSetCardTableEntryIntoCSetClosure: public CardTableEntryClosure { | |
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366 G1CollectedHeap* _g1; |
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367 CardTableModRefBS* _ct_bs; |
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368 public: |
| 1705 | 369 UpdateRSetCardTableEntryIntoCSetClosure(G1CollectedHeap* g1, |
| 370 CardTableModRefBS* bs): | |
| 371 _g1(g1), _ct_bs(bs) | |
| 372 { } | |
| 373 | |
| 374 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 375 // Construct the region representing the card. | |
| 376 HeapWord* start = _ct_bs->addr_for(card_ptr); | |
| 377 // And find the region containing it. | |
| 378 HeapRegion* r = _g1->heap_region_containing(start); | |
| 379 assert(r != NULL, "unexpected null"); | |
| 380 | |
| 381 // Scan oops in the card looking for references into the collection set | |
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382 // Don't use addr_for(card_ptr + 1) which can ask for |
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383 // a card beyond the heap. This is not safe without a perm |
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384 // gen. |
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385 HeapWord* end = start + CardTableModRefBS::card_size_in_words; |
| 1705 | 386 MemRegion scanRegion(start, end); |
| 387 | |
| 388 UpdateRSetImmediate update_rs_cl(_g1->g1_rem_set()); | |
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389 FilterIntoCSClosure update_rs_cset_oop_cl(NULL, _g1, &update_rs_cl); |
| 1705 | 390 FilterOutOfRegionClosure filter_then_update_rs_cset_oop_cl(r, &update_rs_cset_oop_cl); |
| 391 | |
| 392 // We can pass false as the "filter_young" parameter here as: | |
| 393 // * we should be in a STW pause, | |
| 394 // * the DCQS to which this closure is applied is used to hold | |
| 395 // references that point into the collection set from the prior | |
| 396 // RSet updating, | |
| 397 // * the post-write barrier shouldn't be logging updates to young | |
| 398 // regions (but there is a situation where this can happen - see | |
| 1861 | 399 // the comment in G1RemSet::concurrentRefineOneCard below - |
| 1705 | 400 // that should not be applicable here), and |
| 401 // * during actual RSet updating, the filtering of cards in young | |
| 402 // regions in HeapRegion::oops_on_card_seq_iterate_careful is | |
| 403 // employed. | |
| 404 // As a result, when this closure is applied to "refs into cset" | |
| 405 // DCQS, we shouldn't see any cards in young regions. | |
| 406 update_rs_cl.set_region(r); | |
| 407 HeapWord* stop_point = | |
| 408 r->oops_on_card_seq_iterate_careful(scanRegion, | |
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409 &filter_then_update_rs_cset_oop_cl, |
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410 false /* filter_young */, |
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411 NULL /* card_ptr */); |
| 1705 | 412 |
| 413 // Since this is performed in the event of an evacuation failure, we | |
| 414 // we shouldn't see a non-null stop point | |
| 415 assert(stop_point == NULL, "saw an unallocated region"); | |
| 416 return true; | |
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417 } |
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418 }; |
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419 |
| 1861 | 420 void G1RemSet::cleanup_after_oops_into_collection_set_do() { |
| 342 | 421 guarantee( _cards_scanned != NULL, "invariant" ); |
| 422 _total_cards_scanned = 0; | |
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423 for (uint i = 0; i < n_workers(); ++i) { |
| 342 | 424 _total_cards_scanned += _cards_scanned[i]; |
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425 } |
| 6197 | 426 FREE_C_HEAP_ARRAY(size_t, _cards_scanned, mtGC); |
| 342 | 427 _cards_scanned = NULL; |
| 428 // Cleanup after copy | |
| 429 _g1->set_refine_cte_cl_concurrency(true); | |
| 430 // Set all cards back to clean. | |
| 431 _g1->cleanUpCardTable(); | |
| 794 | 432 |
| 1705 | 433 DirtyCardQueueSet& into_cset_dcqs = _g1->into_cset_dirty_card_queue_set(); |
| 434 int into_cset_n_buffers = into_cset_dcqs.completed_buffers_num(); | |
| 435 | |
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436 if (_g1->evacuation_failed()) { |
| 1705 | 437 // Restore remembered sets for the regions pointing into the collection set. |
| 438 | |
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439 if (G1DeferredRSUpdate) { |
| 1705 | 440 // If deferred RS updates are enabled then we just need to transfer |
| 441 // the completed buffers from (a) the DirtyCardQueueSet used to hold | |
| 442 // cards that contain references that point into the collection set | |
| 443 // to (b) the DCQS used to hold the deferred RS updates | |
| 444 _g1->dirty_card_queue_set().merge_bufferlists(&into_cset_dcqs); | |
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445 } else { |
| 1705 | 446 |
| 447 CardTableModRefBS* bs = (CardTableModRefBS*)_g1->barrier_set(); | |
| 448 UpdateRSetCardTableEntryIntoCSetClosure update_rs_cset_immediate(_g1, bs); | |
| 449 | |
| 450 int n_completed_buffers = 0; | |
| 451 while (into_cset_dcqs.apply_closure_to_completed_buffer(&update_rs_cset_immediate, | |
| 452 0, 0, true)) { | |
| 453 n_completed_buffers++; | |
| 454 } | |
| 455 assert(n_completed_buffers == into_cset_n_buffers, "missed some buffers"); | |
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456 } |
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457 } |
| 1705 | 458 |
| 459 // Free any completed buffers in the DirtyCardQueueSet used to hold cards | |
| 460 // which contain references that point into the collection. | |
| 461 _g1->into_cset_dirty_card_queue_set().clear(); | |
| 462 assert(_g1->into_cset_dirty_card_queue_set().completed_buffers_num() == 0, | |
| 463 "all buffers should be freed"); | |
| 464 _g1->into_cset_dirty_card_queue_set().clear_n_completed_buffers(); | |
| 342 | 465 } |
| 466 | |
| 467 class ScrubRSClosure: public HeapRegionClosure { | |
| 468 G1CollectedHeap* _g1h; | |
| 469 BitMap* _region_bm; | |
| 470 BitMap* _card_bm; | |
| 471 CardTableModRefBS* _ctbs; | |
| 472 public: | |
| 473 ScrubRSClosure(BitMap* region_bm, BitMap* card_bm) : | |
| 474 _g1h(G1CollectedHeap::heap()), | |
| 475 _region_bm(region_bm), _card_bm(card_bm), | |
| 476 _ctbs(NULL) | |
| 477 { | |
| 478 ModRefBarrierSet* bs = _g1h->mr_bs(); | |
| 479 guarantee(bs->is_a(BarrierSet::CardTableModRef), "Precondition"); | |
| 480 _ctbs = (CardTableModRefBS*)bs; | |
| 481 } | |
| 482 | |
| 483 bool doHeapRegion(HeapRegion* r) { | |
| 484 if (!r->continuesHumongous()) { | |
| 485 r->rem_set()->scrub(_ctbs, _region_bm, _card_bm); | |
| 486 } | |
| 487 return false; | |
| 488 } | |
| 489 }; | |
| 490 | |
| 1861 | 491 void G1RemSet::scrub(BitMap* region_bm, BitMap* card_bm) { |
| 342 | 492 ScrubRSClosure scrub_cl(region_bm, card_bm); |
| 493 _g1->heap_region_iterate(&scrub_cl); | |
| 494 } | |
| 495 | |
| 1861 | 496 void G1RemSet::scrub_par(BitMap* region_bm, BitMap* card_bm, |
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497 uint worker_num, int claim_val) { |
| 342 | 498 ScrubRSClosure scrub_cl(region_bm, card_bm); |
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499 _g1->heap_region_par_iterate_chunked(&scrub_cl, |
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500 worker_num, |
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501 n_workers(), |
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502 claim_val); |
| 342 | 503 } |
| 504 | |
| 505 | |
| 4839 | 506 |
| 507 G1TriggerClosure::G1TriggerClosure() : | |
| 508 _triggered(false) { } | |
| 509 | |
| 510 G1InvokeIfNotTriggeredClosure::G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t_cl, | |
| 511 OopClosure* oop_cl) : | |
| 512 _trigger_cl(t_cl), _oop_cl(oop_cl) { } | |
| 1705 | 513 |
| 4839 | 514 G1Mux2Closure::G1Mux2Closure(OopClosure *c1, OopClosure *c2) : |
| 515 _c1(c1), _c2(c2) { } | |
| 1705 | 516 |
| 4839 | 517 G1UpdateRSOrPushRefOopClosure:: |
| 518 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h, | |
| 519 G1RemSet* rs, | |
| 520 OopsInHeapRegionClosure* push_ref_cl, | |
| 521 bool record_refs_into_cset, | |
| 522 int worker_i) : | |
| 523 _g1(g1h), _g1_rem_set(rs), _from(NULL), | |
| 524 _record_refs_into_cset(record_refs_into_cset), | |
| 525 _push_ref_cl(push_ref_cl), _worker_i(worker_i) { } | |
| 1705 | 526 |
| 1861 | 527 bool G1RemSet::concurrentRefineOneCard_impl(jbyte* card_ptr, int worker_i, |
| 1705 | 528 bool check_for_refs_into_cset) { |
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529 // Construct the region representing the card. |
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530 HeapWord* start = _ct_bs->addr_for(card_ptr); |
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531 // And find the region containing it. |
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532 HeapRegion* r = _g1->heap_region_containing(start); |
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533 assert(r != NULL, "unexpected null"); |
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534 |
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535 // Don't use addr_for(card_ptr + 1) which can ask for |
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536 // a card beyond the heap. This is not safe without a perm |
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537 // gen at the upper end of the heap. |
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538 HeapWord* end = start + CardTableModRefBS::card_size_in_words; |
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539 MemRegion dirtyRegion(start, end); |
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540 |
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541 #if CARD_REPEAT_HISTO |
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542 init_ct_freq_table(_g1->max_capacity()); |
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543 ct_freq_note_card(_ct_bs->index_for(start)); |
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544 #endif |
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545 |
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546 OopsInHeapRegionClosure* oops_in_heap_closure = NULL; |
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547 if (check_for_refs_into_cset) { |
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548 // ConcurrentG1RefineThreads have worker numbers larger than what |
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549 // _cset_rs_update_cl[] is set up to handle. But those threads should |
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550 // only be active outside of a collection which means that when they |
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551 // reach here they should have check_for_refs_into_cset == false. |
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552 assert((size_t)worker_i < n_workers(), "index of worker larger than _cset_rs_update_cl[].length"); |
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553 oops_in_heap_closure = _cset_rs_update_cl[worker_i]; |
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554 } |
| 4839 | 555 G1UpdateRSOrPushRefOopClosure update_rs_oop_cl(_g1, |
| 556 _g1->g1_rem_set(), | |
| 557 oops_in_heap_closure, | |
| 558 check_for_refs_into_cset, | |
| 559 worker_i); | |
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560 update_rs_oop_cl.set_from(r); |
| 1705 | 561 |
| 4839 | 562 G1TriggerClosure trigger_cl; |
|
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563 FilterIntoCSClosure into_cs_cl(NULL, _g1, &trigger_cl); |
| 4839 | 564 G1InvokeIfNotTriggeredClosure invoke_cl(&trigger_cl, &into_cs_cl); |
| 565 G1Mux2Closure mux(&invoke_cl, &update_rs_oop_cl); | |
| 1705 | 566 |
| 567 FilterOutOfRegionClosure filter_then_update_rs_oop_cl(r, | |
| 568 (check_for_refs_into_cset ? | |
| 569 (OopClosure*)&mux : | |
| 570 (OopClosure*)&update_rs_oop_cl)); | |
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571 |
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572 // The region for the current card may be a young region. The |
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573 // current card may have been a card that was evicted from the |
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574 // card cache. When the card was inserted into the cache, we had |
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575 // determined that its region was non-young. While in the cache, |
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576 // the region may have been freed during a cleanup pause, reallocated |
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577 // and tagged as young. |
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578 // |
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579 // We wish to filter out cards for such a region but the current |
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580 // thread, if we're running concurrently, may "see" the young type |
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581 // change at any time (so an earlier "is_young" check may pass or |
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582 // fail arbitrarily). We tell the iteration code to perform this |
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583 // filtering when it has been determined that there has been an actual |
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584 // allocation in this region and making it safe to check the young type. |
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585 bool filter_young = true; |
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586 |
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587 HeapWord* stop_point = |
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588 r->oops_on_card_seq_iterate_careful(dirtyRegion, |
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589 &filter_then_update_rs_oop_cl, |
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590 filter_young, |
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591 card_ptr); |
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592 |
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593 // If stop_point is non-null, then we encountered an unallocated region |
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594 // (perhaps the unfilled portion of a TLAB.) For now, we'll dirty the |
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595 // card and re-enqueue: if we put off the card until a GC pause, then the |
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596 // unallocated portion will be filled in. Alternatively, we might try |
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597 // the full complexity of the technique used in "regular" precleaning. |
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598 if (stop_point != NULL) { |
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599 // The card might have gotten re-dirtied and re-enqueued while we |
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600 // worked. (In fact, it's pretty likely.) |
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601 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
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602 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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603 MutexLockerEx x(Shared_DirtyCardQ_lock, |
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604 Mutex::_no_safepoint_check_flag); |
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605 DirtyCardQueue* sdcq = |
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606 JavaThread::dirty_card_queue_set().shared_dirty_card_queue(); |
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607 sdcq->enqueue(card_ptr); |
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608 } |
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609 } else { |
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610 _conc_refine_cards++; |
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611 } |
| 1705 | 612 |
| 4839 | 613 return trigger_cl.triggered(); |
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614 } |
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615 |
| 1861 | 616 bool G1RemSet::concurrentRefineOneCard(jbyte* card_ptr, int worker_i, |
| 1705 | 617 bool check_for_refs_into_cset) { |
| 342 | 618 // If the card is no longer dirty, nothing to do. |
| 1705 | 619 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
| 620 // No need to return that this card contains refs that point | |
| 621 // into the collection set. | |
| 622 return false; | |
| 623 } | |
| 342 | 624 |
| 625 // Construct the region representing the card. | |
| 626 HeapWord* start = _ct_bs->addr_for(card_ptr); | |
| 627 // And find the region containing it. | |
| 628 HeapRegion* r = _g1->heap_region_containing(start); | |
| 629 if (r == NULL) { | |
| 1705 | 630 // Again no need to return that this card contains refs that |
| 631 // point into the collection set. | |
| 632 return false; // Not in the G1 heap (might be in perm, for example.) | |
| 342 | 633 } |
| 634 // Why do we have to check here whether a card is on a young region, | |
| 635 // given that we dirty young regions and, as a result, the | |
| 636 // post-barrier is supposed to filter them out and never to enqueue | |
| 637 // them? When we allocate a new region as the "allocation region" we | |
| 638 // actually dirty its cards after we release the lock, since card | |
| 639 // dirtying while holding the lock was a performance bottleneck. So, | |
| 640 // as a result, it is possible for other threads to actually | |
| 641 // allocate objects in the region (after the acquire the lock) | |
| 642 // before all the cards on the region are dirtied. This is unlikely, | |
| 643 // and it doesn't happen often, but it can happen. So, the extra | |
| 644 // check below filters out those cards. | |
|
637
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645 if (r->is_young()) { |
| 1705 | 646 return false; |
| 342 | 647 } |
| 648 // While we are processing RSet buffers during the collection, we | |
| 649 // actually don't want to scan any cards on the collection set, | |
| 650 // since we don't want to update remebered sets with entries that | |
| 651 // point into the collection set, given that live objects from the | |
| 652 // collection set are about to move and such entries will be stale | |
| 653 // very soon. This change also deals with a reliability issue which | |
| 654 // involves scanning a card in the collection set and coming across | |
| 655 // an array that was being chunked and looking malformed. Note, | |
| 656 // however, that if evacuation fails, we have to scan any objects | |
| 657 // that were not moved and create any missing entries. | |
| 658 if (r->in_collection_set()) { | |
| 1705 | 659 return false; |
| 342 | 660 } |
| 661 | |
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662 // Should we defer processing the card? |
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663 // |
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664 // Previously the result from the insert_cache call would be |
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665 // either card_ptr (implying that card_ptr was currently "cold"), |
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666 // null (meaning we had inserted the card ptr into the "hot" |
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667 // cache, which had some headroom), or a "hot" card ptr |
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668 // extracted from the "hot" cache. |
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669 // |
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670 // Now that the _card_counts cache in the ConcurrentG1Refine |
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671 // instance is an evicting hash table, the result we get back |
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672 // could be from evicting the card ptr in an already occupied |
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673 // bucket (in which case we have replaced the card ptr in the |
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674 // bucket with card_ptr and "defer" is set to false). To avoid |
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675 // having a data structure (updates to which would need a lock) |
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676 // to hold these unprocessed dirty cards, we need to immediately |
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677 // process card_ptr. The actions needed to be taken on return |
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678 // from cache_insert are summarized in the following table: |
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679 // |
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680 // res defer action |
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681 // -------------------------------------------------------------- |
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682 // null false card evicted from _card_counts & replaced with |
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683 // card_ptr; evicted ptr added to hot cache. |
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684 // No need to process res; immediately process card_ptr |
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685 // |
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686 // null true card not evicted from _card_counts; card_ptr added |
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687 // to hot cache. |
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688 // Nothing to do. |
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689 // |
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690 // non-null false card evicted from _card_counts & replaced with |
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691 // card_ptr; evicted ptr is currently "cold" or |
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692 // caused an eviction from the hot cache. |
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693 // Immediately process res; process card_ptr. |
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694 // |
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695 // non-null true card not evicted from _card_counts; card_ptr is |
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696 // currently cold, or caused an eviction from hot |
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697 // cache. |
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698 // Immediately process res; no need to process card_ptr. |
| 342 | 699 |
| 1705 | 700 |
|
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701 jbyte* res = card_ptr; |
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702 bool defer = false; |
| 1705 | 703 |
| 704 // This gets set to true if the card being refined has references | |
| 705 // that point into the collection set. | |
| 706 bool oops_into_cset = false; | |
| 707 | |
|
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708 if (_cg1r->use_cache()) { |
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709 jbyte* res = _cg1r->cache_insert(card_ptr, &defer); |
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710 if (res != NULL && (res != card_ptr || defer)) { |
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711 start = _ct_bs->addr_for(res); |
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712 r = _g1->heap_region_containing(start); |
|
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713 if (r != NULL) { |
|
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714 // Checking whether the region we got back from the cache |
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715 // is young here is inappropriate. The region could have been |
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716 // freed, reallocated and tagged as young while in the cache. |
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717 // Hence we could see its young type change at any time. |
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718 // |
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719 // Process card pointer we get back from the hot card cache. This |
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720 // will check whether the region containing the card is young |
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721 // _after_ checking that the region has been allocated from. |
| 1705 | 722 oops_into_cset = concurrentRefineOneCard_impl(res, worker_i, |
| 723 false /* check_for_refs_into_cset */); | |
| 724 // The above call to concurrentRefineOneCard_impl is only | |
| 725 // performed if the hot card cache is enabled. This cache is | |
| 726 // disabled during an evacuation pause - which is the only | |
| 727 // time when we need know if the card contains references | |
| 728 // that point into the collection set. Also when the hot card | |
| 729 // cache is enabled, this code is executed by the concurrent | |
| 730 // refine threads - rather than the GC worker threads - and | |
| 731 // concurrentRefineOneCard_impl will return false. | |
| 732 assert(!oops_into_cset, "should not see true here"); | |
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733 } |
| 342 | 734 } |
| 735 } | |
| 736 | |
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737 if (!defer) { |
| 1705 | 738 oops_into_cset = |
| 739 concurrentRefineOneCard_impl(card_ptr, worker_i, check_for_refs_into_cset); | |
| 740 // We should only be detecting that the card contains references | |
| 741 // that point into the collection set if the current thread is | |
| 742 // a GC worker thread. | |
| 743 assert(!oops_into_cset || SafepointSynchronize::is_at_safepoint(), | |
| 744 "invalid result at non safepoint"); | |
| 342 | 745 } |
| 1705 | 746 return oops_into_cset; |
| 342 | 747 } |
| 748 | |
| 749 class HRRSStatsIter: public HeapRegionClosure { | |
| 750 size_t _occupied; | |
| 751 size_t _total_mem_sz; | |
| 752 size_t _max_mem_sz; | |
| 753 HeapRegion* _max_mem_sz_region; | |
| 754 public: | |
| 755 HRRSStatsIter() : | |
| 756 _occupied(0), | |
| 757 _total_mem_sz(0), | |
| 758 _max_mem_sz(0), | |
| 759 _max_mem_sz_region(NULL) | |
| 760 {} | |
| 761 | |
| 762 bool doHeapRegion(HeapRegion* r) { | |
| 763 if (r->continuesHumongous()) return false; | |
| 764 size_t mem_sz = r->rem_set()->mem_size(); | |
| 765 if (mem_sz > _max_mem_sz) { | |
| 766 _max_mem_sz = mem_sz; | |
| 767 _max_mem_sz_region = r; | |
| 768 } | |
| 769 _total_mem_sz += mem_sz; | |
| 770 size_t occ = r->rem_set()->occupied(); | |
| 771 _occupied += occ; | |
| 772 return false; | |
| 773 } | |
| 774 size_t total_mem_sz() { return _total_mem_sz; } | |
| 775 size_t max_mem_sz() { return _max_mem_sz; } | |
| 776 size_t occupied() { return _occupied; } | |
| 777 HeapRegion* max_mem_sz_region() { return _max_mem_sz_region; } | |
| 778 }; | |
| 779 | |
| 794 | 780 class PrintRSThreadVTimeClosure : public ThreadClosure { |
| 781 public: | |
| 782 virtual void do_thread(Thread *t) { | |
| 783 ConcurrentG1RefineThread* crt = (ConcurrentG1RefineThread*) t; | |
| 784 gclog_or_tty->print(" %5.2f", crt->vtime_accum()); | |
| 785 } | |
| 786 }; | |
| 787 | |
| 1861 | 788 void G1RemSet::print_summary_info() { |
| 342 | 789 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
| 790 | |
| 791 #if CARD_REPEAT_HISTO | |
| 792 gclog_or_tty->print_cr("\nG1 card_repeat count histogram: "); | |
| 793 gclog_or_tty->print_cr(" # of repeats --> # of cards with that number."); | |
| 794 card_repeat_count.print_on(gclog_or_tty); | |
| 795 #endif | |
| 796 | |
| 794 | 797 gclog_or_tty->print_cr("\n Concurrent RS processed %d cards", |
| 798 _conc_refine_cards); | |
| 342 | 799 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 800 jint tot_processed_buffers = | |
| 801 dcqs.processed_buffers_mut() + dcqs.processed_buffers_rs_thread(); | |
| 802 gclog_or_tty->print_cr(" Of %d completed buffers:", tot_processed_buffers); | |
| 794 | 803 gclog_or_tty->print_cr(" %8d (%5.1f%%) by conc RS threads.", |
| 342 | 804 dcqs.processed_buffers_rs_thread(), |
| 805 100.0*(float)dcqs.processed_buffers_rs_thread()/ | |
| 806 (float)tot_processed_buffers); | |
| 807 gclog_or_tty->print_cr(" %8d (%5.1f%%) by mutator threads.", | |
| 808 dcqs.processed_buffers_mut(), | |
| 809 100.0*(float)dcqs.processed_buffers_mut()/ | |
| 810 (float)tot_processed_buffers); | |
| 794 | 811 gclog_or_tty->print_cr(" Conc RS threads times(s)"); |
| 812 PrintRSThreadVTimeClosure p; | |
| 813 gclog_or_tty->print(" "); | |
| 814 g1->concurrent_g1_refine()->threads_do(&p); | |
| 342 | 815 gclog_or_tty->print_cr(""); |
| 794 | 816 |
| 1861 | 817 HRRSStatsIter blk; |
| 818 g1->heap_region_iterate(&blk); | |
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819 gclog_or_tty->print_cr(" Total heap region rem set sizes = "SIZE_FORMAT"K." |
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820 " Max = "SIZE_FORMAT"K.", |
| 1861 | 821 blk.total_mem_sz()/K, blk.max_mem_sz()/K); |
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822 gclog_or_tty->print_cr(" Static structures = "SIZE_FORMAT"K," |
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823 " free_lists = "SIZE_FORMAT"K.", |
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824 HeapRegionRemSet::static_mem_size() / K, |
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825 HeapRegionRemSet::fl_mem_size() / K); |
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826 gclog_or_tty->print_cr(" "SIZE_FORMAT" occupied cards represented.", |
| 1861 | 827 blk.occupied()); |
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828 HeapRegion* max_mem_sz_region = blk.max_mem_sz_region(); |
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829 HeapRegionRemSet* rem_set = max_mem_sz_region->rem_set(); |
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830 gclog_or_tty->print_cr(" Max size region = "HR_FORMAT", " |
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831 "size = "SIZE_FORMAT "K, occupied = "SIZE_FORMAT"K.", |
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832 HR_FORMAT_PARAMS(max_mem_sz_region), |
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833 (rem_set->mem_size() + K - 1)/K, |
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834 (rem_set->occupied() + K - 1)/K); |
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835 gclog_or_tty->print_cr(" Did %d coarsenings.", |
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836 HeapRegionRemSet::n_coarsenings()); |
| 342 | 837 } |
| 1705 | 838 |
| 1861 | 839 void G1RemSet::prepare_for_verify() { |
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840 if (G1HRRSFlushLogBuffersOnVerify && |
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841 (VerifyBeforeGC || VerifyAfterGC) |
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842 && !_g1->full_collection()) { |
| 342 | 843 cleanupHRRS(); |
| 844 _g1->set_refine_cte_cl_concurrency(false); | |
| 845 if (SafepointSynchronize::is_at_safepoint()) { | |
| 846 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 847 dcqs.concatenate_logs(); | |
| 848 } | |
| 849 bool cg1r_use_cache = _cg1r->use_cache(); | |
| 850 _cg1r->set_use_cache(false); | |
| 1705 | 851 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); |
| 852 updateRS(&into_cset_dcq, 0); | |
| 853 _g1->into_cset_dirty_card_queue_set().clear(); | |
| 342 | 854 _cg1r->set_use_cache(cg1r_use_cache); |
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855 |
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856 assert(JavaThread::dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
| 342 | 857 } |
| 858 } |