Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1RemSet.cpp @ 20304:a22acf6d7598
8048112: G1 Full GC needs to support the case when the very first region is not available
Summary: Refactor preparation for compaction during Full GC so that it lazily initializes the first compaction point. This also avoids problems later when the first region may not be committed. Also reviewed by K. Barrett.
Reviewed-by: brutisso
| author | tschatzl |
|---|---|
| date | Mon, 21 Jul 2014 10:00:31 +0200 |
| parents | 02e61cf08ab3 |
| children | eec72fa4b108 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
| 27 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" | |
| 28 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" | |
| 29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1HotCardCache.hpp" |
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32 #include "gc_implementation/g1/g1GCPhaseTimes.hpp" |
| 1972 | 33 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
| 34 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
| 35 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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36 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
| 1972 | 37 #include "memory/iterator.hpp" |
| 38 #include "oops/oop.inline.hpp" | |
| 39 #include "utilities/intHisto.hpp" | |
| 342 | 40 |
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41 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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42 |
| 342 | 43 #define CARD_REPEAT_HISTO 0 |
| 44 | |
| 45 #if CARD_REPEAT_HISTO | |
| 46 static size_t ct_freq_sz; | |
| 47 static jbyte* ct_freq = NULL; | |
| 48 | |
| 49 void init_ct_freq_table(size_t heap_sz_bytes) { | |
| 50 if (ct_freq == NULL) { | |
| 51 ct_freq_sz = heap_sz_bytes/CardTableModRefBS::card_size; | |
| 52 ct_freq = new jbyte[ct_freq_sz]; | |
| 53 for (size_t j = 0; j < ct_freq_sz; j++) ct_freq[j] = 0; | |
| 54 } | |
| 55 } | |
| 56 | |
| 57 void ct_freq_note_card(size_t index) { | |
| 58 assert(0 <= index && index < ct_freq_sz, "Bounds error."); | |
| 59 if (ct_freq[index] < 100) { ct_freq[index]++; } | |
| 60 } | |
| 61 | |
| 62 static IntHistogram card_repeat_count(10, 10); | |
| 63 | |
| 64 void ct_freq_update_histo_and_reset() { | |
| 65 for (size_t j = 0; j < ct_freq_sz; j++) { | |
| 66 card_repeat_count.add_entry(ct_freq[j]); | |
| 67 ct_freq[j] = 0; | |
| 68 } | |
| 69 | |
| 70 } | |
| 71 #endif | |
| 72 | |
| 1861 | 73 G1RemSet::G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs) |
| 74 : _g1(g1), _conc_refine_cards(0), | |
| 75 _ct_bs(ct_bs), _g1p(_g1->g1_policy()), | |
| 342 | 76 _cg1r(g1->concurrent_g1_refine()), |
| 1705 | 77 _cset_rs_update_cl(NULL), |
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78 _cards_scanned(NULL), _total_cards_scanned(0), |
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79 _prev_period_summary() |
| 342 | 80 { |
| 81 _seq_task = new SubTasksDone(NumSeqTasks); | |
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82 guarantee(n_workers() > 0, "There should be some workers"); |
| 6197 | 83 _cset_rs_update_cl = NEW_C_HEAP_ARRAY(OopsInHeapRegionClosure*, n_workers(), mtGC); |
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84 for (uint i = 0; i < n_workers(); i++) { |
| 1705 | 85 _cset_rs_update_cl[i] = NULL; |
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86 } |
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87 if (G1SummarizeRSetStats) { |
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88 _prev_period_summary.initialize(this); |
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89 } |
| 342 | 90 } |
| 91 | |
| 1861 | 92 G1RemSet::~G1RemSet() { |
| 342 | 93 delete _seq_task; |
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94 for (uint i = 0; i < n_workers(); i++) { |
| 1705 | 95 assert(_cset_rs_update_cl[i] == NULL, "it should be"); |
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96 } |
| 6197 | 97 FREE_C_HEAP_ARRAY(OopsInHeapRegionClosure*, _cset_rs_update_cl, mtGC); |
| 342 | 98 } |
| 99 | |
| 100 void CountNonCleanMemRegionClosure::do_MemRegion(MemRegion mr) { | |
| 101 if (_g1->is_in_g1_reserved(mr.start())) { | |
| 102 _n += (int) ((mr.byte_size() / CardTableModRefBS::card_size)); | |
| 103 if (_start_first == NULL) _start_first = mr.start(); | |
| 104 } | |
| 105 } | |
| 106 | |
| 107 class ScanRSClosure : public HeapRegionClosure { | |
| 108 size_t _cards_done, _cards; | |
| 109 G1CollectedHeap* _g1h; | |
| 12080 | 110 |
| 342 | 111 OopsInHeapRegionClosure* _oc; |
| 12080 | 112 CodeBlobToOopClosure* _code_root_cl; |
| 113 | |
| 342 | 114 G1BlockOffsetSharedArray* _bot_shared; |
| 12343 | 115 G1SATBCardTableModRefBS *_ct_bs; |
| 12080 | 116 |
| 117 double _strong_code_root_scan_time_sec; | |
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118 uint _worker_i; |
| 12080 | 119 int _block_size; |
| 120 bool _try_claimed; | |
| 121 | |
| 342 | 122 public: |
| 12080 | 123 ScanRSClosure(OopsInHeapRegionClosure* oc, |
| 124 CodeBlobToOopClosure* code_root_cl, | |
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125 uint worker_i) : |
| 342 | 126 _oc(oc), |
| 12080 | 127 _code_root_cl(code_root_cl), |
| 128 _strong_code_root_scan_time_sec(0.0), | |
| 342 | 129 _cards(0), |
| 130 _cards_done(0), | |
| 131 _worker_i(worker_i), | |
| 132 _try_claimed(false) | |
| 133 { | |
| 134 _g1h = G1CollectedHeap::heap(); | |
| 135 _bot_shared = _g1h->bot_shared(); | |
| 12343 | 136 _ct_bs = _g1h->g1_barrier_set(); |
| 1261 | 137 _block_size = MAX2<int>(G1RSetScanBlockSize, 1); |
| 342 | 138 } |
| 139 | |
| 140 void set_try_claimed() { _try_claimed = true; } | |
| 141 | |
| 142 void scanCard(size_t index, HeapRegion *r) { | |
| 4023 | 143 // Stack allocate the DirtyCardToOopClosure instance |
| 144 HeapRegionDCTOC cl(_g1h, r, _oc, | |
| 145 CardTableModRefBS::Precise, | |
| 146 HeapRegionDCTOC::IntoCSFilterKind); | |
| 342 | 147 |
| 148 // Set the "from" region in the closure. | |
| 149 _oc->set_region(r); | |
| 150 HeapWord* card_start = _bot_shared->address_for_index(index); | |
| 151 HeapWord* card_end = card_start + G1BlockOffsetSharedArray::N_words; | |
| 152 Space *sp = SharedHeap::heap()->space_containing(card_start); | |
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153 MemRegion sm_region = sp->used_region_at_save_marks(); |
| 342 | 154 MemRegion mr = sm_region.intersection(MemRegion(card_start,card_end)); |
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155 if (!mr.is_empty() && !_ct_bs->is_card_claimed(index)) { |
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156 // We make the card as "claimed" lazily (so races are possible |
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157 // but they're benign), which reduces the number of duplicate |
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158 // scans (the rsets of the regions in the cset can intersect). |
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159 _ct_bs->set_card_claimed(index); |
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160 _cards_done++; |
| 4023 | 161 cl.do_MemRegion(mr); |
| 342 | 162 } |
| 163 } | |
| 164 | |
| 165 void printCard(HeapRegion* card_region, size_t card_index, | |
| 166 HeapWord* card_start) { | |
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167 gclog_or_tty->print_cr("T " UINT32_FORMAT " Region [" PTR_FORMAT ", " PTR_FORMAT ") " |
| 342 | 168 "RS names card %p: " |
| 169 "[" PTR_FORMAT ", " PTR_FORMAT ")", | |
| 170 _worker_i, | |
| 171 card_region->bottom(), card_region->end(), | |
| 172 card_index, | |
| 173 card_start, card_start + G1BlockOffsetSharedArray::N_words); | |
| 174 } | |
| 175 | |
| 12080 | 176 void scan_strong_code_roots(HeapRegion* r) { |
| 177 double scan_start = os::elapsedTime(); | |
| 178 r->strong_code_roots_do(_code_root_cl); | |
| 179 _strong_code_root_scan_time_sec += (os::elapsedTime() - scan_start); | |
| 180 } | |
| 181 | |
| 342 | 182 bool doHeapRegion(HeapRegion* r) { |
| 183 assert(r->in_collection_set(), "should only be called on elements of CS."); | |
| 184 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 185 if (hrrs->iter_is_complete()) return false; // All done. | |
| 186 if (!_try_claimed && !hrrs->claim_iter()) return false; | |
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187 // If we ever free the collection set concurrently, we should also |
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188 // clear the card table concurrently therefore we won't need to |
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189 // add regions of the collection set to the dirty cards region. |
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190 _g1h->push_dirty_cards_region(r); |
| 342 | 191 // If we didn't return above, then |
| 192 // _try_claimed || r->claim_iter() | |
| 193 // is true: either we're supposed to work on claimed-but-not-complete | |
| 194 // regions, or we successfully claimed the region. | |
| 12080 | 195 |
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196 HeapRegionRemSetIterator iter(hrrs); |
| 342 | 197 size_t card_index; |
| 1261 | 198 |
| 199 // We claim cards in block so as to recude the contention. The block size is determined by | |
| 200 // the G1RSetScanBlockSize parameter. | |
| 201 size_t jump_to_card = hrrs->iter_claimed_next(_block_size); | |
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202 for (size_t current_card = 0; iter.has_next(card_index); current_card++) { |
| 1261 | 203 if (current_card >= jump_to_card + _block_size) { |
| 204 jump_to_card = hrrs->iter_claimed_next(_block_size); | |
| 747 | 205 } |
| 1261 | 206 if (current_card < jump_to_card) continue; |
| 342 | 207 HeapWord* card_start = _g1h->bot_shared()->address_for_index(card_index); |
| 208 #if 0 | |
| 209 gclog_or_tty->print("Rem set iteration yielded card [" PTR_FORMAT ", " PTR_FORMAT ").\n", | |
| 210 card_start, card_start + CardTableModRefBS::card_size_in_words); | |
| 211 #endif | |
| 212 | |
| 213 HeapRegion* card_region = _g1h->heap_region_containing(card_start); | |
| 214 assert(card_region != NULL, "Yielding cards not in the heap?"); | |
| 215 _cards++; | |
| 216 | |
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217 if (!card_region->is_on_dirty_cards_region_list()) { |
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218 _g1h->push_dirty_cards_region(card_region); |
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219 } |
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220 |
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221 // If the card is dirty, then we will scan it during updateRS. |
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222 if (!card_region->in_collection_set() && |
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223 !_ct_bs->is_card_dirty(card_index)) { |
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224 scanCard(card_index, card_region); |
| 342 | 225 } |
| 226 } | |
| 747 | 227 if (!_try_claimed) { |
| 12080 | 228 // Scan the strong code root list attached to the current region |
| 229 scan_strong_code_roots(r); | |
| 230 | |
| 747 | 231 hrrs->set_iter_complete(); |
| 232 } | |
| 342 | 233 return false; |
| 234 } | |
| 12080 | 235 |
| 236 double strong_code_root_scan_time_sec() { | |
| 237 return _strong_code_root_scan_time_sec; | |
| 238 } | |
| 239 | |
| 342 | 240 size_t cards_done() { return _cards_done;} |
| 241 size_t cards_looked_up() { return _cards;} | |
| 242 }; | |
| 243 | |
| 12080 | 244 void G1RemSet::scanRS(OopsInHeapRegionClosure* oc, |
| 245 CodeBlobToOopClosure* code_root_cl, | |
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246 uint worker_i) { |
| 342 | 247 double rs_time_start = os::elapsedTime(); |
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248 HeapRegion *startRegion = _g1->start_cset_region_for_worker(worker_i); |
| 342 | 249 |
| 12080 | 250 ScanRSClosure scanRScl(oc, code_root_cl, worker_i); |
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251 |
| 342 | 252 _g1->collection_set_iterate_from(startRegion, &scanRScl); |
| 253 scanRScl.set_try_claimed(); | |
| 254 _g1->collection_set_iterate_from(startRegion, &scanRScl); | |
| 255 | |
| 12080 | 256 double scan_rs_time_sec = (os::elapsedTime() - rs_time_start) |
| 257 - scanRScl.strong_code_root_scan_time_sec(); | |
| 342 | 258 |
| 12080 | 259 assert(_cards_scanned != NULL, "invariant"); |
| 342 | 260 _cards_scanned[worker_i] = scanRScl.cards_done(); |
| 261 | |
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262 _g1p->phase_times()->record_scan_rs_time(worker_i, scan_rs_time_sec * 1000.0); |
| 12080 | 263 _g1p->phase_times()->record_strong_code_root_scan_time(worker_i, |
| 264 scanRScl.strong_code_root_scan_time_sec() * 1000.0); | |
| 342 | 265 } |
| 266 | |
| 1705 | 267 // Closure used for updating RSets and recording references that |
| 268 // point into the collection set. Only called during an | |
| 269 // evacuation pause. | |
| 270 | |
| 271 class RefineRecordRefsIntoCSCardTableEntryClosure: public CardTableEntryClosure { | |
| 272 G1RemSet* _g1rs; | |
| 273 DirtyCardQueue* _into_cset_dcq; | |
| 274 public: | |
| 275 RefineRecordRefsIntoCSCardTableEntryClosure(G1CollectedHeap* g1h, | |
| 276 DirtyCardQueue* into_cset_dcq) : | |
| 277 _g1rs(g1h->g1_rem_set()), _into_cset_dcq(into_cset_dcq) | |
| 278 {} | |
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279 bool do_card_ptr(jbyte* card_ptr, uint worker_i) { |
| 1705 | 280 // The only time we care about recording cards that |
| 281 // contain references that point into the collection set | |
| 282 // is during RSet updating within an evacuation pause. | |
| 283 // In this case worker_i should be the id of a GC worker thread. | |
| 284 assert(SafepointSynchronize::is_at_safepoint(), "not during an evacuation pause"); | |
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285 assert(worker_i < (ParallelGCThreads == 0 ? 1 : ParallelGCThreads), "should be a GC worker"); |
| 342 | 286 |
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287 if (_g1rs->refine_card(card_ptr, worker_i, true)) { |
| 1705 | 288 // 'card_ptr' contains references that point into the collection |
| 289 // set. We need to record the card in the DCQS | |
| 290 // (G1CollectedHeap::into_cset_dirty_card_queue_set()) | |
| 291 // that's used for that purpose. | |
| 292 // | |
| 293 // Enqueue the card | |
| 294 _into_cset_dcq->enqueue(card_ptr); | |
| 295 } | |
| 296 return true; | |
| 297 } | |
| 298 }; | |
| 299 | |
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300 void G1RemSet::updateRS(DirtyCardQueue* into_cset_dcq, uint worker_i) { |
| 342 | 301 double start = os::elapsedTime(); |
| 1705 | 302 // Apply the given closure to all remaining log entries. |
| 303 RefineRecordRefsIntoCSCardTableEntryClosure into_cset_update_rs_cl(_g1, into_cset_dcq); | |
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304 |
| 1705 | 305 _g1->iterate_dirty_card_closure(&into_cset_update_rs_cl, into_cset_dcq, false, worker_i); |
| 306 | |
| 794 | 307 // Now there should be no dirty cards. |
| 308 if (G1RSLogCheckCardTable) { | |
| 309 CountNonCleanMemRegionClosure cl(_g1); | |
| 310 _ct_bs->mod_card_iterate(&cl); | |
| 311 // XXX This isn't true any more: keeping cards of young regions | |
| 312 // marked dirty broke it. Need some reasonable fix. | |
| 313 guarantee(cl.n() == 0, "Card table should be clean."); | |
| 342 | 314 } |
| 794 | 315 |
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316 _g1p->phase_times()->record_update_rs_time(worker_i, (os::elapsedTime() - start) * 1000.0); |
| 342 | 317 } |
| 318 | |
| 1861 | 319 void G1RemSet::cleanupHRRS() { |
| 342 | 320 HeapRegionRemSet::cleanup(); |
| 321 } | |
| 322 | |
| 1861 | 323 void G1RemSet::oops_into_collection_set_do(OopsInHeapRegionClosure* oc, |
| 12080 | 324 CodeBlobToOopClosure* code_root_cl, |
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325 uint worker_i) { |
| 342 | 326 #if CARD_REPEAT_HISTO |
| 327 ct_freq_update_histo_and_reset(); | |
| 328 #endif | |
| 329 | |
| 1705 | 330 // We cache the value of 'oc' closure into the appropriate slot in the |
| 331 // _cset_rs_update_cl for this worker | |
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332 assert(worker_i < n_workers(), "sanity"); |
| 1705 | 333 _cset_rs_update_cl[worker_i] = oc; |
| 334 | |
| 335 // A DirtyCardQueue that is used to hold cards containing references | |
| 336 // that point into the collection set. This DCQ is associated with a | |
| 337 // special DirtyCardQueueSet (see g1CollectedHeap.hpp). Under normal | |
| 338 // circumstances (i.e. the pause successfully completes), these cards | |
| 339 // are just discarded (there's no need to update the RSets of regions | |
| 340 // that were in the collection set - after the pause these regions | |
| 341 // are wholly 'free' of live objects. In the event of an evacuation | |
| 342 // failure the cards/buffers in this queue set are: | |
| 343 // * passed to the DirtyCardQueueSet that is used to manage deferred | |
| 344 // RSet updates, or | |
| 345 // * scanned for references that point into the collection set | |
| 346 // and the RSet of the corresponding region in the collection set | |
| 347 // is updated immediately. | |
| 348 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); | |
| 349 | |
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350 assert((ParallelGCThreads > 0) || worker_i == 0, "invariant"); |
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351 |
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352 // The two flags below were introduced temporarily to serialize |
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353 // the updating and scanning of remembered sets. There are some |
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354 // race conditions when these two operations are done in parallel |
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355 // and they are causing failures. When we resolve said race |
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356 // conditions, we'll revert back to parallel remembered set |
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357 // updating and scanning. See CRs 6677707 and 6677708. |
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358 if (G1UseParallelRSetUpdating || (worker_i == 0)) { |
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359 updateRS(&into_cset_dcq, worker_i); |
| 342 | 360 } else { |
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361 _g1p->phase_times()->record_update_rs_processed_buffers(worker_i, 0); |
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362 _g1p->phase_times()->record_update_rs_time(worker_i, 0.0); |
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363 } |
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364 if (G1UseParallelRSetScanning || (worker_i == 0)) { |
| 12080 | 365 scanRS(oc, code_root_cl, worker_i); |
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366 } else { |
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367 _g1p->phase_times()->record_scan_rs_time(worker_i, 0.0); |
| 342 | 368 } |
| 1705 | 369 |
| 370 // We now clear the cached values of _cset_rs_update_cl for this worker | |
| 371 _cset_rs_update_cl[worker_i] = NULL; | |
| 342 | 372 } |
| 373 | |
| 1861 | 374 void G1RemSet::prepare_for_oops_into_collection_set_do() { |
| 342 | 375 cleanupHRRS(); |
| 376 ConcurrentG1Refine* cg1r = _g1->concurrent_g1_refine(); | |
| 377 _g1->set_refine_cte_cl_concurrency(false); | |
| 378 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 379 dcqs.concatenate_logs(); | |
| 380 | |
| 381 guarantee( _cards_scanned == NULL, "invariant" ); | |
| 6197 | 382 _cards_scanned = NEW_C_HEAP_ARRAY(size_t, n_workers(), mtGC); |
| 545 | 383 for (uint i = 0; i < n_workers(); ++i) { |
| 384 _cards_scanned[i] = 0; | |
| 385 } | |
| 342 | 386 _total_cards_scanned = 0; |
| 387 } | |
| 388 | |
| 389 | |
| 1705 | 390 // This closure, applied to a DirtyCardQueueSet, is used to immediately |
| 391 // update the RSets for the regions in the CSet. For each card it iterates | |
| 392 // through the oops which coincide with that card. It scans the reference | |
| 393 // fields in each oop; when it finds an oop that points into the collection | |
| 394 // set, the RSet for the region containing the referenced object is updated. | |
| 395 class UpdateRSetCardTableEntryIntoCSetClosure: public CardTableEntryClosure { | |
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396 G1CollectedHeap* _g1; |
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397 CardTableModRefBS* _ct_bs; |
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398 public: |
| 1705 | 399 UpdateRSetCardTableEntryIntoCSetClosure(G1CollectedHeap* g1, |
| 400 CardTableModRefBS* bs): | |
| 401 _g1(g1), _ct_bs(bs) | |
| 402 { } | |
| 403 | |
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404 bool do_card_ptr(jbyte* card_ptr, uint worker_i) { |
| 1705 | 405 // Construct the region representing the card. |
| 406 HeapWord* start = _ct_bs->addr_for(card_ptr); | |
| 407 // And find the region containing it. | |
| 408 HeapRegion* r = _g1->heap_region_containing(start); | |
| 409 assert(r != NULL, "unexpected null"); | |
| 410 | |
| 411 // Scan oops in the card looking for references into the collection set | |
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412 // Don't use addr_for(card_ptr + 1) which can ask for |
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413 // a card beyond the heap. This is not safe without a perm |
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414 // gen. |
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415 HeapWord* end = start + CardTableModRefBS::card_size_in_words; |
| 1705 | 416 MemRegion scanRegion(start, end); |
| 417 | |
| 418 UpdateRSetImmediate update_rs_cl(_g1->g1_rem_set()); | |
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419 FilterIntoCSClosure update_rs_cset_oop_cl(NULL, _g1, &update_rs_cl); |
| 1705 | 420 FilterOutOfRegionClosure filter_then_update_rs_cset_oop_cl(r, &update_rs_cset_oop_cl); |
| 421 | |
| 422 // We can pass false as the "filter_young" parameter here as: | |
| 423 // * we should be in a STW pause, | |
| 424 // * the DCQS to which this closure is applied is used to hold | |
| 425 // references that point into the collection set from the prior | |
| 426 // RSet updating, | |
| 427 // * the post-write barrier shouldn't be logging updates to young | |
| 428 // regions (but there is a situation where this can happen - see | |
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429 // the comment in G1RemSet::refine_card() below - |
| 1705 | 430 // that should not be applicable here), and |
| 431 // * during actual RSet updating, the filtering of cards in young | |
| 432 // regions in HeapRegion::oops_on_card_seq_iterate_careful is | |
| 433 // employed. | |
| 434 // As a result, when this closure is applied to "refs into cset" | |
| 435 // DCQS, we shouldn't see any cards in young regions. | |
| 436 update_rs_cl.set_region(r); | |
| 437 HeapWord* stop_point = | |
| 438 r->oops_on_card_seq_iterate_careful(scanRegion, | |
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439 &filter_then_update_rs_cset_oop_cl, |
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440 false /* filter_young */, |
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441 NULL /* card_ptr */); |
| 1705 | 442 |
| 443 // Since this is performed in the event of an evacuation failure, we | |
| 444 // we shouldn't see a non-null stop point | |
| 445 assert(stop_point == NULL, "saw an unallocated region"); | |
| 446 return true; | |
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447 } |
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448 }; |
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449 |
| 1861 | 450 void G1RemSet::cleanup_after_oops_into_collection_set_do() { |
| 342 | 451 guarantee( _cards_scanned != NULL, "invariant" ); |
| 452 _total_cards_scanned = 0; | |
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453 for (uint i = 0; i < n_workers(); ++i) { |
| 342 | 454 _total_cards_scanned += _cards_scanned[i]; |
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455 } |
| 6197 | 456 FREE_C_HEAP_ARRAY(size_t, _cards_scanned, mtGC); |
| 342 | 457 _cards_scanned = NULL; |
| 458 // Cleanup after copy | |
| 459 _g1->set_refine_cte_cl_concurrency(true); | |
| 460 // Set all cards back to clean. | |
| 461 _g1->cleanUpCardTable(); | |
| 794 | 462 |
| 1705 | 463 DirtyCardQueueSet& into_cset_dcqs = _g1->into_cset_dirty_card_queue_set(); |
| 464 int into_cset_n_buffers = into_cset_dcqs.completed_buffers_num(); | |
| 465 | |
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466 if (_g1->evacuation_failed()) { |
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467 double restore_remembered_set_start = os::elapsedTime(); |
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468 |
| 1705 | 469 // Restore remembered sets for the regions pointing into the collection set. |
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470 if (G1DeferredRSUpdate) { |
| 1705 | 471 // If deferred RS updates are enabled then we just need to transfer |
| 472 // the completed buffers from (a) the DirtyCardQueueSet used to hold | |
| 473 // cards that contain references that point into the collection set | |
| 474 // to (b) the DCQS used to hold the deferred RS updates | |
| 475 _g1->dirty_card_queue_set().merge_bufferlists(&into_cset_dcqs); | |
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476 } else { |
| 1705 | 477 |
| 478 CardTableModRefBS* bs = (CardTableModRefBS*)_g1->barrier_set(); | |
| 479 UpdateRSetCardTableEntryIntoCSetClosure update_rs_cset_immediate(_g1, bs); | |
| 480 | |
| 481 int n_completed_buffers = 0; | |
| 482 while (into_cset_dcqs.apply_closure_to_completed_buffer(&update_rs_cset_immediate, | |
| 483 0, 0, true)) { | |
| 484 n_completed_buffers++; | |
| 485 } | |
| 486 assert(n_completed_buffers == into_cset_n_buffers, "missed some buffers"); | |
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487 } |
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488 |
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489 _g1->g1_policy()->phase_times()->record_evac_fail_restore_remsets((os::elapsedTime() - restore_remembered_set_start) * 1000.0); |
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490 } |
| 1705 | 491 |
| 492 // Free any completed buffers in the DirtyCardQueueSet used to hold cards | |
| 493 // which contain references that point into the collection. | |
| 494 _g1->into_cset_dirty_card_queue_set().clear(); | |
| 495 assert(_g1->into_cset_dirty_card_queue_set().completed_buffers_num() == 0, | |
| 496 "all buffers should be freed"); | |
| 497 _g1->into_cset_dirty_card_queue_set().clear_n_completed_buffers(); | |
| 342 | 498 } |
| 499 | |
| 500 class ScrubRSClosure: public HeapRegionClosure { | |
| 501 G1CollectedHeap* _g1h; | |
| 502 BitMap* _region_bm; | |
| 503 BitMap* _card_bm; | |
| 504 CardTableModRefBS* _ctbs; | |
| 505 public: | |
| 506 ScrubRSClosure(BitMap* region_bm, BitMap* card_bm) : | |
| 507 _g1h(G1CollectedHeap::heap()), | |
| 508 _region_bm(region_bm), _card_bm(card_bm), | |
| 12343 | 509 _ctbs(_g1h->g1_barrier_set()) {} |
| 342 | 510 |
| 511 bool doHeapRegion(HeapRegion* r) { | |
| 512 if (!r->continuesHumongous()) { | |
| 513 r->rem_set()->scrub(_ctbs, _region_bm, _card_bm); | |
| 514 } | |
| 515 return false; | |
| 516 } | |
| 517 }; | |
| 518 | |
| 1861 | 519 void G1RemSet::scrub(BitMap* region_bm, BitMap* card_bm) { |
| 342 | 520 ScrubRSClosure scrub_cl(region_bm, card_bm); |
| 521 _g1->heap_region_iterate(&scrub_cl); | |
| 522 } | |
| 523 | |
| 1861 | 524 void G1RemSet::scrub_par(BitMap* region_bm, BitMap* card_bm, |
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525 uint worker_num, int claim_val) { |
| 342 | 526 ScrubRSClosure scrub_cl(region_bm, card_bm); |
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527 _g1->heap_region_par_iterate_chunked(&scrub_cl, |
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528 worker_num, |
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529 n_workers(), |
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530 claim_val); |
| 342 | 531 } |
| 532 | |
| 4839 | 533 G1TriggerClosure::G1TriggerClosure() : |
| 534 _triggered(false) { } | |
| 535 | |
| 536 G1InvokeIfNotTriggeredClosure::G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t_cl, | |
| 537 OopClosure* oop_cl) : | |
| 538 _trigger_cl(t_cl), _oop_cl(oop_cl) { } | |
| 1705 | 539 |
| 4839 | 540 G1Mux2Closure::G1Mux2Closure(OopClosure *c1, OopClosure *c2) : |
| 541 _c1(c1), _c2(c2) { } | |
| 1705 | 542 |
| 4839 | 543 G1UpdateRSOrPushRefOopClosure:: |
| 544 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h, | |
| 545 G1RemSet* rs, | |
| 546 OopsInHeapRegionClosure* push_ref_cl, | |
| 547 bool record_refs_into_cset, | |
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548 uint worker_i) : |
| 4839 | 549 _g1(g1h), _g1_rem_set(rs), _from(NULL), |
| 550 _record_refs_into_cset(record_refs_into_cset), | |
| 551 _push_ref_cl(push_ref_cl), _worker_i(worker_i) { } | |
| 1705 | 552 |
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553 // Returns true if the given card contains references that point |
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554 // into the collection set, if we're checking for such references; |
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555 // false otherwise. |
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556 |
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557 bool G1RemSet::refine_card(jbyte* card_ptr, uint worker_i, |
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558 bool check_for_refs_into_cset) { |
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559 |
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560 // If the card is no longer dirty, nothing to do. |
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561 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
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562 // No need to return that this card contains refs that point |
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563 // into the collection set. |
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564 return false; |
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565 } |
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566 |
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567 // Construct the region representing the card. |
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568 HeapWord* start = _ct_bs->addr_for(card_ptr); |
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569 // And find the region containing it. |
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570 HeapRegion* r = _g1->heap_region_containing(start); |
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571 if (r == NULL) { |
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572 // Again no need to return that this card contains refs that |
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573 // point into the collection set. |
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574 return false; // Not in the G1 heap (might be in perm, for example.) |
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575 } |
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576 |
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577 // Why do we have to check here whether a card is on a young region, |
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578 // given that we dirty young regions and, as a result, the |
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579 // post-barrier is supposed to filter them out and never to enqueue |
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580 // them? When we allocate a new region as the "allocation region" we |
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581 // actually dirty its cards after we release the lock, since card |
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582 // dirtying while holding the lock was a performance bottleneck. So, |
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583 // as a result, it is possible for other threads to actually |
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584 // allocate objects in the region (after the acquire the lock) |
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585 // before all the cards on the region are dirtied. This is unlikely, |
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586 // and it doesn't happen often, but it can happen. So, the extra |
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587 // check below filters out those cards. |
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588 if (r->is_young()) { |
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589 return false; |
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590 } |
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591 |
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592 // While we are processing RSet buffers during the collection, we |
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593 // actually don't want to scan any cards on the collection set, |
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594 // since we don't want to update remebered sets with entries that |
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595 // point into the collection set, given that live objects from the |
|
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596 // collection set are about to move and such entries will be stale |
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597 // very soon. This change also deals with a reliability issue which |
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598 // involves scanning a card in the collection set and coming across |
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599 // an array that was being chunked and looking malformed. Note, |
|
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600 // however, that if evacuation fails, we have to scan any objects |
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601 // that were not moved and create any missing entries. |
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602 if (r->in_collection_set()) { |
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603 return false; |
|
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604 } |
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605 |
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606 // The result from the hot card cache insert call is either: |
|
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607 // * pointer to the current card |
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608 // (implying that the current card is not 'hot'), |
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609 // * null |
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610 // (meaning we had inserted the card ptr into the "hot" card cache, |
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611 // which had some headroom), |
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612 // * a pointer to a "hot" card that was evicted from the "hot" cache. |
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613 // |
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614 |
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615 G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
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616 if (hot_card_cache->use_cache()) { |
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617 assert(!check_for_refs_into_cset, "sanity"); |
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618 assert(!SafepointSynchronize::is_at_safepoint(), "sanity"); |
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619 |
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620 card_ptr = hot_card_cache->insert(card_ptr); |
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621 if (card_ptr == NULL) { |
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622 // There was no eviction. Nothing to do. |
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623 return false; |
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624 } |
|
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625 |
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626 start = _ct_bs->addr_for(card_ptr); |
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627 r = _g1->heap_region_containing(start); |
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628 if (r == NULL) { |
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629 // Not in the G1 heap |
|
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630 return false; |
|
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|
631 } |
|
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|
632 |
|
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|
633 // Checking whether the region we got back from the cache |
|
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634 // is young here is inappropriate. The region could have been |
|
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635 // freed, reallocated and tagged as young while in the cache. |
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636 // Hence we could see its young type change at any time. |
|
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637 } |
|
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638 |
|
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639 // Don't use addr_for(card_ptr + 1) which can ask for |
|
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640 // a card beyond the heap. This is not safe without a perm |
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641 // gen at the upper end of the heap. |
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642 HeapWord* end = start + CardTableModRefBS::card_size_in_words; |
|
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643 MemRegion dirtyRegion(start, end); |
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644 |
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|
645 #if CARD_REPEAT_HISTO |
|
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646 init_ct_freq_table(_g1->max_capacity()); |
|
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647 ct_freq_note_card(_ct_bs->index_for(start)); |
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648 #endif |
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|
649 |
|
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650 OopsInHeapRegionClosure* oops_in_heap_closure = NULL; |
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651 if (check_for_refs_into_cset) { |
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652 // ConcurrentG1RefineThreads have worker numbers larger than what |
|
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653 // _cset_rs_update_cl[] is set up to handle. But those threads should |
|
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654 // only be active outside of a collection which means that when they |
|
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|
655 // reach here they should have check_for_refs_into_cset == false. |
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656 assert((size_t)worker_i < n_workers(), "index of worker larger than _cset_rs_update_cl[].length"); |
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657 oops_in_heap_closure = _cset_rs_update_cl[worker_i]; |
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658 } |
| 4839 | 659 G1UpdateRSOrPushRefOopClosure update_rs_oop_cl(_g1, |
| 660 _g1->g1_rem_set(), | |
| 661 oops_in_heap_closure, | |
| 662 check_for_refs_into_cset, | |
| 663 worker_i); | |
|
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664 update_rs_oop_cl.set_from(r); |
| 1705 | 665 |
| 4839 | 666 G1TriggerClosure trigger_cl; |
|
3983
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7097053: G1: assert(da ? referent->is_oop() : referent->is_oop_or_null()) failed: referenceProcessor.cpp:1054
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|
667 FilterIntoCSClosure into_cs_cl(NULL, _g1, &trigger_cl); |
| 4839 | 668 G1InvokeIfNotTriggeredClosure invoke_cl(&trigger_cl, &into_cs_cl); |
| 669 G1Mux2Closure mux(&invoke_cl, &update_rs_oop_cl); | |
| 1705 | 670 |
| 671 FilterOutOfRegionClosure filter_then_update_rs_oop_cl(r, | |
| 672 (check_for_refs_into_cset ? | |
| 673 (OopClosure*)&mux : | |
| 674 (OopClosure*)&update_rs_oop_cl)); | |
|
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675 |
|
1666
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676 // The region for the current card may be a young region. The |
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677 // current card may have been a card that was evicted from the |
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678 // card cache. When the card was inserted into the cache, we had |
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679 // determined that its region was non-young. While in the cache, |
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680 // the region may have been freed during a cleanup pause, reallocated |
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681 // and tagged as young. |
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682 // |
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683 // We wish to filter out cards for such a region but the current |
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684 // thread, if we're running concurrently, may "see" the young type |
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685 // change at any time (so an earlier "is_young" check may pass or |
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686 // fail arbitrarily). We tell the iteration code to perform this |
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687 // filtering when it has been determined that there has been an actual |
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688 // allocation in this region and making it safe to check the young type. |
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689 bool filter_young = true; |
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690 |
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691 HeapWord* stop_point = |
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692 r->oops_on_card_seq_iterate_careful(dirtyRegion, |
|
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693 &filter_then_update_rs_oop_cl, |
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694 filter_young, |
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695 card_ptr); |
|
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696 |
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697 // If stop_point is non-null, then we encountered an unallocated region |
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698 // (perhaps the unfilled portion of a TLAB.) For now, we'll dirty the |
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699 // card and re-enqueue: if we put off the card until a GC pause, then the |
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700 // unallocated portion will be filled in. Alternatively, we might try |
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701 // the full complexity of the technique used in "regular" precleaning. |
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702 if (stop_point != NULL) { |
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703 // The card might have gotten re-dirtied and re-enqueued while we |
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704 // worked. (In fact, it's pretty likely.) |
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705 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
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706 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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707 MutexLockerEx x(Shared_DirtyCardQ_lock, |
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708 Mutex::_no_safepoint_check_flag); |
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709 DirtyCardQueue* sdcq = |
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710 JavaThread::dirty_card_queue_set().shared_dirty_card_queue(); |
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711 sdcq->enqueue(card_ptr); |
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712 } |
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713 } else { |
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714 _conc_refine_cards++; |
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715 } |
| 1705 | 716 |
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717 // This gets set to true if the card being refined has |
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718 // references that point into the collection set. |
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719 bool has_refs_into_cset = trigger_cl.triggered(); |
| 342 | 720 |
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721 // We should only be detecting that the card contains references |
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722 // that point into the collection set if the current thread is |
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723 // a GC worker thread. |
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724 assert(!has_refs_into_cset || SafepointSynchronize::is_at_safepoint(), |
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725 "invalid result at non safepoint"); |
| 1705 | 726 |
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727 return has_refs_into_cset; |
| 342 | 728 } |
| 729 | |
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730 void G1RemSet::print_periodic_summary_info(const char* header) { |
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731 G1RemSetSummary current; |
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732 current.initialize(this); |
| 342 | 733 |
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734 _prev_period_summary.subtract_from(¤t); |
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735 print_summary_info(&_prev_period_summary, header); |
| 342 | 736 |
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737 _prev_period_summary.set(¤t); |
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738 } |
| 794 | 739 |
| 1861 | 740 void G1RemSet::print_summary_info() { |
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741 G1RemSetSummary current; |
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742 current.initialize(this); |
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743 |
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744 print_summary_info(¤t, " Cumulative RS summary"); |
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745 } |
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746 |
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747 void G1RemSet::print_summary_info(G1RemSetSummary * summary, const char * header) { |
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748 assert(summary != NULL, "just checking"); |
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749 |
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750 if (header != NULL) { |
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751 gclog_or_tty->print_cr("%s", header); |
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752 } |
| 342 | 753 |
| 754 #if CARD_REPEAT_HISTO | |
| 755 gclog_or_tty->print_cr("\nG1 card_repeat count histogram: "); | |
| 756 gclog_or_tty->print_cr(" # of repeats --> # of cards with that number."); | |
| 757 card_repeat_count.print_on(gclog_or_tty); | |
| 758 #endif | |
| 759 | |
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760 summary->print_on(gclog_or_tty); |
| 342 | 761 } |
| 1705 | 762 |
| 1861 | 763 void G1RemSet::prepare_for_verify() { |
|
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764 if (G1HRRSFlushLogBuffersOnVerify && |
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765 (VerifyBeforeGC || VerifyAfterGC) |
|
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766 && (!_g1->full_collection() || G1VerifyRSetsDuringFullGC)) { |
| 342 | 767 cleanupHRRS(); |
| 768 _g1->set_refine_cte_cl_concurrency(false); | |
| 769 if (SafepointSynchronize::is_at_safepoint()) { | |
| 770 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 771 dcqs.concatenate_logs(); | |
| 772 } | |
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773 |
|
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774 G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
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775 bool use_hot_card_cache = hot_card_cache->use_cache(); |
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776 hot_card_cache->set_use_cache(false); |
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777 |
| 1705 | 778 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); |
| 779 updateRS(&into_cset_dcq, 0); | |
| 780 _g1->into_cset_dirty_card_queue_set().clear(); | |
|
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781 |
|
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782 hot_card_cache->set_use_cache(use_hot_card_cache); |
|
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783 assert(JavaThread::dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
| 342 | 784 } |
| 785 } |