Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1RemSet.cpp @ 17833:bfdf528be8e8
8038498: Fix includes and C inlining after 8035330
Summary: Change 8035330: Remove G1ParScanPartialArrayClosure and G1ParScanHeapEvacClosure broke the debug build on AIX. The method do_oop_partial_array() is added in a header, but requires the inline function par_write_ref() through several inlined calls. In some cpp files, like arguments.cpp, par_write_ref() is not defined as the corresponding inline header and is not included. The AIX debug VM does not start because of the missing symbol. This change solves this by cleaning up include dependencies.
Reviewed-by: tschatzl, stefank
| author | tschatzl |
|---|---|
| date | Fri, 04 Apr 2014 10:43:56 +0200 |
| parents | eff02b5bd56c |
| children | 8847586c9037 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "gc_implementation/g1/bufferingOopClosure.hpp" | |
| 27 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
| 28 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" | |
| 29 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" | |
| 30 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 31 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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32 #include "gc_implementation/g1/g1HotCardCache.hpp" |
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33 #include "gc_implementation/g1/g1GCPhaseTimes.hpp" |
| 1972 | 34 #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
| 35 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
| 36 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
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37 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
| 1972 | 38 #include "memory/iterator.hpp" |
| 39 #include "oops/oop.inline.hpp" | |
| 40 #include "utilities/intHisto.hpp" | |
| 342 | 41 |
| 42 #define CARD_REPEAT_HISTO 0 | |
| 43 | |
| 44 #if CARD_REPEAT_HISTO | |
| 45 static size_t ct_freq_sz; | |
| 46 static jbyte* ct_freq = NULL; | |
| 47 | |
| 48 void init_ct_freq_table(size_t heap_sz_bytes) { | |
| 49 if (ct_freq == NULL) { | |
| 50 ct_freq_sz = heap_sz_bytes/CardTableModRefBS::card_size; | |
| 51 ct_freq = new jbyte[ct_freq_sz]; | |
| 52 for (size_t j = 0; j < ct_freq_sz; j++) ct_freq[j] = 0; | |
| 53 } | |
| 54 } | |
| 55 | |
| 56 void ct_freq_note_card(size_t index) { | |
| 57 assert(0 <= index && index < ct_freq_sz, "Bounds error."); | |
| 58 if (ct_freq[index] < 100) { ct_freq[index]++; } | |
| 59 } | |
| 60 | |
| 61 static IntHistogram card_repeat_count(10, 10); | |
| 62 | |
| 63 void ct_freq_update_histo_and_reset() { | |
| 64 for (size_t j = 0; j < ct_freq_sz; j++) { | |
| 65 card_repeat_count.add_entry(ct_freq[j]); | |
| 66 ct_freq[j] = 0; | |
| 67 } | |
| 68 | |
| 69 } | |
| 70 #endif | |
| 71 | |
| 1861 | 72 G1RemSet::G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs) |
| 73 : _g1(g1), _conc_refine_cards(0), | |
| 74 _ct_bs(ct_bs), _g1p(_g1->g1_policy()), | |
| 342 | 75 _cg1r(g1->concurrent_g1_refine()), |
| 1705 | 76 _cset_rs_update_cl(NULL), |
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77 _cards_scanned(NULL), _total_cards_scanned(0), |
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78 _prev_period_summary() |
| 342 | 79 { |
| 80 _seq_task = new SubTasksDone(NumSeqTasks); | |
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81 guarantee(n_workers() > 0, "There should be some workers"); |
| 6197 | 82 _cset_rs_update_cl = NEW_C_HEAP_ARRAY(OopsInHeapRegionClosure*, n_workers(), mtGC); |
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83 for (uint i = 0; i < n_workers(); i++) { |
| 1705 | 84 _cset_rs_update_cl[i] = NULL; |
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85 } |
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86 if (G1SummarizeRSetStats) { |
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87 _prev_period_summary.initialize(this); |
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88 } |
| 342 | 89 } |
| 90 | |
| 1861 | 91 G1RemSet::~G1RemSet() { |
| 342 | 92 delete _seq_task; |
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93 for (uint i = 0; i < n_workers(); i++) { |
| 1705 | 94 assert(_cset_rs_update_cl[i] == NULL, "it should be"); |
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95 } |
| 6197 | 96 FREE_C_HEAP_ARRAY(OopsInHeapRegionClosure*, _cset_rs_update_cl, mtGC); |
| 342 | 97 } |
| 98 | |
| 99 void CountNonCleanMemRegionClosure::do_MemRegion(MemRegion mr) { | |
| 100 if (_g1->is_in_g1_reserved(mr.start())) { | |
| 101 _n += (int) ((mr.byte_size() / CardTableModRefBS::card_size)); | |
| 102 if (_start_first == NULL) _start_first = mr.start(); | |
| 103 } | |
| 104 } | |
| 105 | |
| 106 class ScanRSClosure : public HeapRegionClosure { | |
| 107 size_t _cards_done, _cards; | |
| 108 G1CollectedHeap* _g1h; | |
| 12080 | 109 |
| 342 | 110 OopsInHeapRegionClosure* _oc; |
| 12080 | 111 CodeBlobToOopClosure* _code_root_cl; |
| 112 | |
| 342 | 113 G1BlockOffsetSharedArray* _bot_shared; |
| 12343 | 114 G1SATBCardTableModRefBS *_ct_bs; |
| 12080 | 115 |
| 116 double _strong_code_root_scan_time_sec; | |
| 117 int _worker_i; | |
| 118 int _block_size; | |
| 119 bool _try_claimed; | |
| 120 | |
| 342 | 121 public: |
| 12080 | 122 ScanRSClosure(OopsInHeapRegionClosure* oc, |
| 123 CodeBlobToOopClosure* code_root_cl, | |
| 124 int worker_i) : | |
| 342 | 125 _oc(oc), |
| 12080 | 126 _code_root_cl(code_root_cl), |
| 127 _strong_code_root_scan_time_sec(0.0), | |
| 342 | 128 _cards(0), |
| 129 _cards_done(0), | |
| 130 _worker_i(worker_i), | |
| 131 _try_claimed(false) | |
| 132 { | |
| 133 _g1h = G1CollectedHeap::heap(); | |
| 134 _bot_shared = _g1h->bot_shared(); | |
| 12343 | 135 _ct_bs = _g1h->g1_barrier_set(); |
| 1261 | 136 _block_size = MAX2<int>(G1RSetScanBlockSize, 1); |
| 342 | 137 } |
| 138 | |
| 139 void set_try_claimed() { _try_claimed = true; } | |
| 140 | |
| 141 void scanCard(size_t index, HeapRegion *r) { | |
| 4023 | 142 // Stack allocate the DirtyCardToOopClosure instance |
| 143 HeapRegionDCTOC cl(_g1h, r, _oc, | |
| 144 CardTableModRefBS::Precise, | |
| 145 HeapRegionDCTOC::IntoCSFilterKind); | |
| 342 | 146 |
| 147 // Set the "from" region in the closure. | |
| 148 _oc->set_region(r); | |
| 149 HeapWord* card_start = _bot_shared->address_for_index(index); | |
| 150 HeapWord* card_end = card_start + G1BlockOffsetSharedArray::N_words; | |
| 151 Space *sp = SharedHeap::heap()->space_containing(card_start); | |
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152 MemRegion sm_region = sp->used_region_at_save_marks(); |
| 342 | 153 MemRegion mr = sm_region.intersection(MemRegion(card_start,card_end)); |
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154 if (!mr.is_empty() && !_ct_bs->is_card_claimed(index)) { |
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155 // We make the card as "claimed" lazily (so races are possible |
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156 // but they're benign), which reduces the number of duplicate |
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157 // scans (the rsets of the regions in the cset can intersect). |
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158 _ct_bs->set_card_claimed(index); |
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159 _cards_done++; |
| 4023 | 160 cl.do_MemRegion(mr); |
| 342 | 161 } |
| 162 } | |
| 163 | |
| 164 void printCard(HeapRegion* card_region, size_t card_index, | |
| 165 HeapWord* card_start) { | |
| 166 gclog_or_tty->print_cr("T %d Region [" PTR_FORMAT ", " PTR_FORMAT ") " | |
| 167 "RS names card %p: " | |
| 168 "[" PTR_FORMAT ", " PTR_FORMAT ")", | |
| 169 _worker_i, | |
| 170 card_region->bottom(), card_region->end(), | |
| 171 card_index, | |
| 172 card_start, card_start + G1BlockOffsetSharedArray::N_words); | |
| 173 } | |
| 174 | |
| 12080 | 175 void scan_strong_code_roots(HeapRegion* r) { |
| 176 double scan_start = os::elapsedTime(); | |
| 177 r->strong_code_roots_do(_code_root_cl); | |
| 178 _strong_code_root_scan_time_sec += (os::elapsedTime() - scan_start); | |
| 179 } | |
| 180 | |
| 342 | 181 bool doHeapRegion(HeapRegion* r) { |
| 182 assert(r->in_collection_set(), "should only be called on elements of CS."); | |
| 183 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 184 if (hrrs->iter_is_complete()) return false; // All done. | |
| 185 if (!_try_claimed && !hrrs->claim_iter()) return false; | |
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186 // If we ever free the collection set concurrently, we should also |
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187 // clear the card table concurrently therefore we won't need to |
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188 // add regions of the collection set to the dirty cards region. |
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189 _g1h->push_dirty_cards_region(r); |
| 342 | 190 // If we didn't return above, then |
| 191 // _try_claimed || r->claim_iter() | |
| 192 // is true: either we're supposed to work on claimed-but-not-complete | |
| 193 // regions, or we successfully claimed the region. | |
| 12080 | 194 |
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195 HeapRegionRemSetIterator iter(hrrs); |
| 342 | 196 size_t card_index; |
| 1261 | 197 |
| 198 // We claim cards in block so as to recude the contention. The block size is determined by | |
| 199 // the G1RSetScanBlockSize parameter. | |
| 200 size_t jump_to_card = hrrs->iter_claimed_next(_block_size); | |
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201 for (size_t current_card = 0; iter.has_next(card_index); current_card++) { |
| 1261 | 202 if (current_card >= jump_to_card + _block_size) { |
| 203 jump_to_card = hrrs->iter_claimed_next(_block_size); | |
| 747 | 204 } |
| 1261 | 205 if (current_card < jump_to_card) continue; |
| 342 | 206 HeapWord* card_start = _g1h->bot_shared()->address_for_index(card_index); |
| 207 #if 0 | |
| 208 gclog_or_tty->print("Rem set iteration yielded card [" PTR_FORMAT ", " PTR_FORMAT ").\n", | |
| 209 card_start, card_start + CardTableModRefBS::card_size_in_words); | |
| 210 #endif | |
| 211 | |
| 212 HeapRegion* card_region = _g1h->heap_region_containing(card_start); | |
| 213 assert(card_region != NULL, "Yielding cards not in the heap?"); | |
| 214 _cards++; | |
| 215 | |
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216 if (!card_region->is_on_dirty_cards_region_list()) { |
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217 _g1h->push_dirty_cards_region(card_region); |
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218 } |
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219 |
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220 // If the card is dirty, then we will scan it during updateRS. |
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221 if (!card_region->in_collection_set() && |
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222 !_ct_bs->is_card_dirty(card_index)) { |
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223 scanCard(card_index, card_region); |
| 342 | 224 } |
| 225 } | |
| 747 | 226 if (!_try_claimed) { |
| 12080 | 227 // Scan the strong code root list attached to the current region |
| 228 scan_strong_code_roots(r); | |
| 229 | |
| 747 | 230 hrrs->set_iter_complete(); |
| 231 } | |
| 342 | 232 return false; |
| 233 } | |
| 12080 | 234 |
| 235 double strong_code_root_scan_time_sec() { | |
| 236 return _strong_code_root_scan_time_sec; | |
| 237 } | |
| 238 | |
| 342 | 239 size_t cards_done() { return _cards_done;} |
| 240 size_t cards_looked_up() { return _cards;} | |
| 241 }; | |
| 242 | |
| 12080 | 243 void G1RemSet::scanRS(OopsInHeapRegionClosure* oc, |
| 244 CodeBlobToOopClosure* code_root_cl, | |
| 245 int worker_i) { | |
| 342 | 246 double rs_time_start = os::elapsedTime(); |
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247 HeapRegion *startRegion = _g1->start_cset_region_for_worker(worker_i); |
| 342 | 248 |
| 12080 | 249 ScanRSClosure scanRScl(oc, code_root_cl, worker_i); |
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250 |
| 342 | 251 _g1->collection_set_iterate_from(startRegion, &scanRScl); |
| 252 scanRScl.set_try_claimed(); | |
| 253 _g1->collection_set_iterate_from(startRegion, &scanRScl); | |
| 254 | |
| 12080 | 255 double scan_rs_time_sec = (os::elapsedTime() - rs_time_start) |
| 256 - scanRScl.strong_code_root_scan_time_sec(); | |
| 342 | 257 |
| 12080 | 258 assert(_cards_scanned != NULL, "invariant"); |
| 342 | 259 _cards_scanned[worker_i] = scanRScl.cards_done(); |
| 260 | |
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261 _g1p->phase_times()->record_scan_rs_time(worker_i, scan_rs_time_sec * 1000.0); |
| 12080 | 262 _g1p->phase_times()->record_strong_code_root_scan_time(worker_i, |
| 263 scanRScl.strong_code_root_scan_time_sec() * 1000.0); | |
| 342 | 264 } |
| 265 | |
| 1705 | 266 // Closure used for updating RSets and recording references that |
| 267 // point into the collection set. Only called during an | |
| 268 // evacuation pause. | |
| 269 | |
| 270 class RefineRecordRefsIntoCSCardTableEntryClosure: public CardTableEntryClosure { | |
| 271 G1RemSet* _g1rs; | |
| 272 DirtyCardQueue* _into_cset_dcq; | |
| 273 public: | |
| 274 RefineRecordRefsIntoCSCardTableEntryClosure(G1CollectedHeap* g1h, | |
| 275 DirtyCardQueue* into_cset_dcq) : | |
| 276 _g1rs(g1h->g1_rem_set()), _into_cset_dcq(into_cset_dcq) | |
| 277 {} | |
| 278 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 279 // The only time we care about recording cards that | |
| 280 // contain references that point into the collection set | |
| 281 // is during RSet updating within an evacuation pause. | |
| 282 // In this case worker_i should be the id of a GC worker thread. | |
| 283 assert(SafepointSynchronize::is_at_safepoint(), "not during an evacuation pause"); | |
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284 assert(worker_i < (int) (ParallelGCThreads == 0 ? 1 : ParallelGCThreads), "should be a GC worker"); |
| 342 | 285 |
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286 if (_g1rs->refine_card(card_ptr, worker_i, true)) { |
| 1705 | 287 // 'card_ptr' contains references that point into the collection |
| 288 // set. We need to record the card in the DCQS | |
| 289 // (G1CollectedHeap::into_cset_dirty_card_queue_set()) | |
| 290 // that's used for that purpose. | |
| 291 // | |
| 292 // Enqueue the card | |
| 293 _into_cset_dcq->enqueue(card_ptr); | |
| 294 } | |
| 295 return true; | |
| 296 } | |
| 297 }; | |
| 298 | |
| 1861 | 299 void G1RemSet::updateRS(DirtyCardQueue* into_cset_dcq, int worker_i) { |
| 342 | 300 double start = os::elapsedTime(); |
| 1705 | 301 // Apply the given closure to all remaining log entries. |
| 302 RefineRecordRefsIntoCSCardTableEntryClosure into_cset_update_rs_cl(_g1, into_cset_dcq); | |
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303 |
| 1705 | 304 _g1->iterate_dirty_card_closure(&into_cset_update_rs_cl, into_cset_dcq, false, worker_i); |
| 305 | |
| 794 | 306 // Now there should be no dirty cards. |
| 307 if (G1RSLogCheckCardTable) { | |
| 308 CountNonCleanMemRegionClosure cl(_g1); | |
| 309 _ct_bs->mod_card_iterate(&cl); | |
| 310 // XXX This isn't true any more: keeping cards of young regions | |
| 311 // marked dirty broke it. Need some reasonable fix. | |
| 312 guarantee(cl.n() == 0, "Card table should be clean."); | |
| 342 | 313 } |
| 794 | 314 |
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315 _g1p->phase_times()->record_update_rs_time(worker_i, (os::elapsedTime() - start) * 1000.0); |
| 342 | 316 } |
| 317 | |
| 1861 | 318 void G1RemSet::cleanupHRRS() { |
| 342 | 319 HeapRegionRemSet::cleanup(); |
| 320 } | |
| 321 | |
| 1861 | 322 void G1RemSet::oops_into_collection_set_do(OopsInHeapRegionClosure* oc, |
| 12080 | 323 CodeBlobToOopClosure* code_root_cl, |
| 324 int worker_i) { | |
| 342 | 325 #if CARD_REPEAT_HISTO |
| 326 ct_freq_update_histo_and_reset(); | |
| 327 #endif | |
| 328 | |
| 1705 | 329 // We cache the value of 'oc' closure into the appropriate slot in the |
| 330 // _cset_rs_update_cl for this worker | |
| 331 assert(worker_i < (int)n_workers(), "sanity"); | |
| 332 _cset_rs_update_cl[worker_i] = oc; | |
| 333 | |
| 334 // A DirtyCardQueue that is used to hold cards containing references | |
| 335 // that point into the collection set. This DCQ is associated with a | |
| 336 // special DirtyCardQueueSet (see g1CollectedHeap.hpp). Under normal | |
| 337 // circumstances (i.e. the pause successfully completes), these cards | |
| 338 // are just discarded (there's no need to update the RSets of regions | |
| 339 // that were in the collection set - after the pause these regions | |
| 340 // are wholly 'free' of live objects. In the event of an evacuation | |
| 341 // failure the cards/buffers in this queue set are: | |
| 342 // * passed to the DirtyCardQueueSet that is used to manage deferred | |
| 343 // RSet updates, or | |
| 344 // * scanned for references that point into the collection set | |
| 345 // and the RSet of the corresponding region in the collection set | |
| 346 // is updated immediately. | |
| 347 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); | |
| 348 | |
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349 assert((ParallelGCThreads > 0) || worker_i == 0, "invariant"); |
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350 |
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351 // The two flags below were introduced temporarily to serialize |
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352 // the updating and scanning of remembered sets. There are some |
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353 // race conditions when these two operations are done in parallel |
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354 // and they are causing failures. When we resolve said race |
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355 // conditions, we'll revert back to parallel remembered set |
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356 // updating and scanning. See CRs 6677707 and 6677708. |
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357 if (G1UseParallelRSetUpdating || (worker_i == 0)) { |
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358 updateRS(&into_cset_dcq, worker_i); |
| 342 | 359 } else { |
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360 _g1p->phase_times()->record_update_rs_processed_buffers(worker_i, 0); |
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361 _g1p->phase_times()->record_update_rs_time(worker_i, 0.0); |
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362 } |
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363 if (G1UseParallelRSetScanning || (worker_i == 0)) { |
| 12080 | 364 scanRS(oc, code_root_cl, worker_i); |
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365 } else { |
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366 _g1p->phase_times()->record_scan_rs_time(worker_i, 0.0); |
| 342 | 367 } |
| 1705 | 368 |
| 369 // We now clear the cached values of _cset_rs_update_cl for this worker | |
| 370 _cset_rs_update_cl[worker_i] = NULL; | |
| 342 | 371 } |
| 372 | |
| 1861 | 373 void G1RemSet::prepare_for_oops_into_collection_set_do() { |
| 342 | 374 cleanupHRRS(); |
| 375 ConcurrentG1Refine* cg1r = _g1->concurrent_g1_refine(); | |
| 376 _g1->set_refine_cte_cl_concurrency(false); | |
| 377 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 378 dcqs.concatenate_logs(); | |
| 379 | |
| 380 guarantee( _cards_scanned == NULL, "invariant" ); | |
| 6197 | 381 _cards_scanned = NEW_C_HEAP_ARRAY(size_t, n_workers(), mtGC); |
| 545 | 382 for (uint i = 0; i < n_workers(); ++i) { |
| 383 _cards_scanned[i] = 0; | |
| 384 } | |
| 342 | 385 _total_cards_scanned = 0; |
| 386 } | |
| 387 | |
| 388 | |
| 1705 | 389 // This closure, applied to a DirtyCardQueueSet, is used to immediately |
| 390 // update the RSets for the regions in the CSet. For each card it iterates | |
| 391 // through the oops which coincide with that card. It scans the reference | |
| 392 // fields in each oop; when it finds an oop that points into the collection | |
| 393 // set, the RSet for the region containing the referenced object is updated. | |
| 394 class UpdateRSetCardTableEntryIntoCSetClosure: public CardTableEntryClosure { | |
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395 G1CollectedHeap* _g1; |
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396 CardTableModRefBS* _ct_bs; |
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397 public: |
| 1705 | 398 UpdateRSetCardTableEntryIntoCSetClosure(G1CollectedHeap* g1, |
| 399 CardTableModRefBS* bs): | |
| 400 _g1(g1), _ct_bs(bs) | |
| 401 { } | |
| 402 | |
| 403 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
| 404 // Construct the region representing the card. | |
| 405 HeapWord* start = _ct_bs->addr_for(card_ptr); | |
| 406 // And find the region containing it. | |
| 407 HeapRegion* r = _g1->heap_region_containing(start); | |
| 408 assert(r != NULL, "unexpected null"); | |
| 409 | |
| 410 // Scan oops in the card looking for references into the collection set | |
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411 // Don't use addr_for(card_ptr + 1) which can ask for |
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412 // a card beyond the heap. This is not safe without a perm |
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413 // gen. |
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414 HeapWord* end = start + CardTableModRefBS::card_size_in_words; |
| 1705 | 415 MemRegion scanRegion(start, end); |
| 416 | |
| 417 UpdateRSetImmediate update_rs_cl(_g1->g1_rem_set()); | |
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418 FilterIntoCSClosure update_rs_cset_oop_cl(NULL, _g1, &update_rs_cl); |
| 1705 | 419 FilterOutOfRegionClosure filter_then_update_rs_cset_oop_cl(r, &update_rs_cset_oop_cl); |
| 420 | |
| 421 // We can pass false as the "filter_young" parameter here as: | |
| 422 // * we should be in a STW pause, | |
| 423 // * the DCQS to which this closure is applied is used to hold | |
| 424 // references that point into the collection set from the prior | |
| 425 // RSet updating, | |
| 426 // * the post-write barrier shouldn't be logging updates to young | |
| 427 // regions (but there is a situation where this can happen - see | |
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428 // the comment in G1RemSet::refine_card() below - |
| 1705 | 429 // that should not be applicable here), and |
| 430 // * during actual RSet updating, the filtering of cards in young | |
| 431 // regions in HeapRegion::oops_on_card_seq_iterate_careful is | |
| 432 // employed. | |
| 433 // As a result, when this closure is applied to "refs into cset" | |
| 434 // DCQS, we shouldn't see any cards in young regions. | |
| 435 update_rs_cl.set_region(r); | |
| 436 HeapWord* stop_point = | |
| 437 r->oops_on_card_seq_iterate_careful(scanRegion, | |
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438 &filter_then_update_rs_cset_oop_cl, |
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439 false /* filter_young */, |
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440 NULL /* card_ptr */); |
| 1705 | 441 |
| 442 // Since this is performed in the event of an evacuation failure, we | |
| 443 // we shouldn't see a non-null stop point | |
| 444 assert(stop_point == NULL, "saw an unallocated region"); | |
| 445 return true; | |
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446 } |
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447 }; |
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448 |
| 1861 | 449 void G1RemSet::cleanup_after_oops_into_collection_set_do() { |
| 342 | 450 guarantee( _cards_scanned != NULL, "invariant" ); |
| 451 _total_cards_scanned = 0; | |
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452 for (uint i = 0; i < n_workers(); ++i) { |
| 342 | 453 _total_cards_scanned += _cards_scanned[i]; |
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454 } |
| 6197 | 455 FREE_C_HEAP_ARRAY(size_t, _cards_scanned, mtGC); |
| 342 | 456 _cards_scanned = NULL; |
| 457 // Cleanup after copy | |
| 458 _g1->set_refine_cte_cl_concurrency(true); | |
| 459 // Set all cards back to clean. | |
| 460 _g1->cleanUpCardTable(); | |
| 794 | 461 |
| 1705 | 462 DirtyCardQueueSet& into_cset_dcqs = _g1->into_cset_dirty_card_queue_set(); |
| 463 int into_cset_n_buffers = into_cset_dcqs.completed_buffers_num(); | |
| 464 | |
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465 if (_g1->evacuation_failed()) { |
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466 double restore_remembered_set_start = os::elapsedTime(); |
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467 |
| 1705 | 468 // Restore remembered sets for the regions pointing into the collection set. |
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469 if (G1DeferredRSUpdate) { |
| 1705 | 470 // If deferred RS updates are enabled then we just need to transfer |
| 471 // the completed buffers from (a) the DirtyCardQueueSet used to hold | |
| 472 // cards that contain references that point into the collection set | |
| 473 // to (b) the DCQS used to hold the deferred RS updates | |
| 474 _g1->dirty_card_queue_set().merge_bufferlists(&into_cset_dcqs); | |
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475 } else { |
| 1705 | 476 |
| 477 CardTableModRefBS* bs = (CardTableModRefBS*)_g1->barrier_set(); | |
| 478 UpdateRSetCardTableEntryIntoCSetClosure update_rs_cset_immediate(_g1, bs); | |
| 479 | |
| 480 int n_completed_buffers = 0; | |
| 481 while (into_cset_dcqs.apply_closure_to_completed_buffer(&update_rs_cset_immediate, | |
| 482 0, 0, true)) { | |
| 483 n_completed_buffers++; | |
| 484 } | |
| 485 assert(n_completed_buffers == into_cset_n_buffers, "missed some buffers"); | |
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486 } |
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487 |
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488 _g1->g1_policy()->phase_times()->record_evac_fail_restore_remsets((os::elapsedTime() - restore_remembered_set_start) * 1000.0); |
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489 } |
| 1705 | 490 |
| 491 // Free any completed buffers in the DirtyCardQueueSet used to hold cards | |
| 492 // which contain references that point into the collection. | |
| 493 _g1->into_cset_dirty_card_queue_set().clear(); | |
| 494 assert(_g1->into_cset_dirty_card_queue_set().completed_buffers_num() == 0, | |
| 495 "all buffers should be freed"); | |
| 496 _g1->into_cset_dirty_card_queue_set().clear_n_completed_buffers(); | |
| 342 | 497 } |
| 498 | |
| 499 class ScrubRSClosure: public HeapRegionClosure { | |
| 500 G1CollectedHeap* _g1h; | |
| 501 BitMap* _region_bm; | |
| 502 BitMap* _card_bm; | |
| 503 CardTableModRefBS* _ctbs; | |
| 504 public: | |
| 505 ScrubRSClosure(BitMap* region_bm, BitMap* card_bm) : | |
| 506 _g1h(G1CollectedHeap::heap()), | |
| 507 _region_bm(region_bm), _card_bm(card_bm), | |
| 12343 | 508 _ctbs(_g1h->g1_barrier_set()) {} |
| 342 | 509 |
| 510 bool doHeapRegion(HeapRegion* r) { | |
| 511 if (!r->continuesHumongous()) { | |
| 512 r->rem_set()->scrub(_ctbs, _region_bm, _card_bm); | |
| 513 } | |
| 514 return false; | |
| 515 } | |
| 516 }; | |
| 517 | |
| 1861 | 518 void G1RemSet::scrub(BitMap* region_bm, BitMap* card_bm) { |
| 342 | 519 ScrubRSClosure scrub_cl(region_bm, card_bm); |
| 520 _g1->heap_region_iterate(&scrub_cl); | |
| 521 } | |
| 522 | |
| 1861 | 523 void G1RemSet::scrub_par(BitMap* region_bm, BitMap* card_bm, |
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524 uint worker_num, int claim_val) { |
| 342 | 525 ScrubRSClosure scrub_cl(region_bm, card_bm); |
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526 _g1->heap_region_par_iterate_chunked(&scrub_cl, |
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527 worker_num, |
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528 n_workers(), |
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529 claim_val); |
| 342 | 530 } |
| 531 | |
| 4839 | 532 G1TriggerClosure::G1TriggerClosure() : |
| 533 _triggered(false) { } | |
| 534 | |
| 535 G1InvokeIfNotTriggeredClosure::G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t_cl, | |
| 536 OopClosure* oop_cl) : | |
| 537 _trigger_cl(t_cl), _oop_cl(oop_cl) { } | |
| 1705 | 538 |
| 4839 | 539 G1Mux2Closure::G1Mux2Closure(OopClosure *c1, OopClosure *c2) : |
| 540 _c1(c1), _c2(c2) { } | |
| 1705 | 541 |
| 4839 | 542 G1UpdateRSOrPushRefOopClosure:: |
| 543 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h, | |
| 544 G1RemSet* rs, | |
| 545 OopsInHeapRegionClosure* push_ref_cl, | |
| 546 bool record_refs_into_cset, | |
| 547 int worker_i) : | |
| 548 _g1(g1h), _g1_rem_set(rs), _from(NULL), | |
| 549 _record_refs_into_cset(record_refs_into_cset), | |
| 550 _push_ref_cl(push_ref_cl), _worker_i(worker_i) { } | |
| 1705 | 551 |
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552 // Returns true if the given card contains references that point |
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553 // into the collection set, if we're checking for such references; |
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554 // false otherwise. |
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555 |
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556 bool G1RemSet::refine_card(jbyte* card_ptr, int worker_i, |
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557 bool check_for_refs_into_cset) { |
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558 |
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559 // If the card is no longer dirty, nothing to do. |
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560 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
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561 // No need to return that this card contains refs that point |
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562 // into the collection set. |
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563 return false; |
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564 } |
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565 |
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566 // Construct the region representing the card. |
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567 HeapWord* start = _ct_bs->addr_for(card_ptr); |
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568 // And find the region containing it. |
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569 HeapRegion* r = _g1->heap_region_containing(start); |
|
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570 if (r == NULL) { |
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571 // Again no need to return that this card contains refs that |
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572 // point into the collection set. |
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573 return false; // Not in the G1 heap (might be in perm, for example.) |
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574 } |
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|
575 |
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576 // Why do we have to check here whether a card is on a young region, |
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577 // given that we dirty young regions and, as a result, the |
|
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578 // post-barrier is supposed to filter them out and never to enqueue |
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579 // them? When we allocate a new region as the "allocation region" we |
|
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580 // actually dirty its cards after we release the lock, since card |
|
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581 // dirtying while holding the lock was a performance bottleneck. So, |
|
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582 // as a result, it is possible for other threads to actually |
|
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|
583 // allocate objects in the region (after the acquire the lock) |
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584 // before all the cards on the region are dirtied. This is unlikely, |
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585 // and it doesn't happen often, but it can happen. So, the extra |
|
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586 // check below filters out those cards. |
|
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587 if (r->is_young()) { |
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588 return false; |
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589 } |
|
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|
590 |
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|
591 // While we are processing RSet buffers during the collection, we |
|
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|
592 // actually don't want to scan any cards on the collection set, |
|
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593 // since we don't want to update remebered sets with entries that |
|
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594 // point into the collection set, given that live objects from the |
|
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595 // collection set are about to move and such entries will be stale |
|
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596 // very soon. This change also deals with a reliability issue which |
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597 // involves scanning a card in the collection set and coming across |
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598 // an array that was being chunked and looking malformed. Note, |
|
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599 // however, that if evacuation fails, we have to scan any objects |
|
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600 // that were not moved and create any missing entries. |
|
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601 if (r->in_collection_set()) { |
|
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602 return false; |
|
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603 } |
|
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|
604 |
|
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|
605 // The result from the hot card cache insert call is either: |
|
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|
606 // * pointer to the current card |
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607 // (implying that the current card is not 'hot'), |
|
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608 // * null |
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609 // (meaning we had inserted the card ptr into the "hot" card cache, |
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610 // which had some headroom), |
|
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611 // * a pointer to a "hot" card that was evicted from the "hot" cache. |
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612 // |
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613 |
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614 G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
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615 if (hot_card_cache->use_cache()) { |
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616 assert(!check_for_refs_into_cset, "sanity"); |
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617 assert(!SafepointSynchronize::is_at_safepoint(), "sanity"); |
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618 |
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619 card_ptr = hot_card_cache->insert(card_ptr); |
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620 if (card_ptr == NULL) { |
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621 // There was no eviction. Nothing to do. |
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622 return false; |
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|
623 } |
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|
624 |
|
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|
625 start = _ct_bs->addr_for(card_ptr); |
|
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626 r = _g1->heap_region_containing(start); |
|
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627 if (r == NULL) { |
|
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|
628 // Not in the G1 heap |
|
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|
629 return false; |
|
194f52aa2f23
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|
630 } |
|
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|
631 |
|
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|
632 // Checking whether the region we got back from the cache |
|
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|
633 // is young here is inappropriate. The region could have been |
|
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634 // freed, reallocated and tagged as young while in the cache. |
|
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|
635 // Hence we could see its young type change at any time. |
|
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|
636 } |
|
890
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|
637 |
|
6725
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6964458: Reimplement class meta-data storage to use native memory
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|
638 // Don't use addr_for(card_ptr + 1) which can ask for |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
639 // a card beyond the heap. This is not safe without a perm |
|
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|
640 // gen at the upper end of the heap. |
|
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|
641 HeapWord* end = start + CardTableModRefBS::card_size_in_words; |
|
890
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642 MemRegion dirtyRegion(start, end); |
|
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|
643 |
|
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|
644 #if CARD_REPEAT_HISTO |
|
2188
c33825b68624
6923430: G1: assert(res != 0,"This should have worked.")
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|
645 init_ct_freq_table(_g1->max_capacity()); |
|
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646 ct_freq_note_card(_ct_bs->index_for(start)); |
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647 #endif |
|
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|
648 |
|
4071
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649 OopsInHeapRegionClosure* oops_in_heap_closure = NULL; |
|
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650 if (check_for_refs_into_cset) { |
|
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651 // ConcurrentG1RefineThreads have worker numbers larger than what |
|
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652 // _cset_rs_update_cl[] is set up to handle. But those threads should |
|
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653 // only be active outside of a collection which means that when they |
|
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|
654 // reach here they should have check_for_refs_into_cset == false. |
|
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|
655 assert((size_t)worker_i < n_workers(), "index of worker larger than _cset_rs_update_cl[].length"); |
|
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|
656 oops_in_heap_closure = _cset_rs_update_cl[worker_i]; |
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|
657 } |
| 4839 | 658 G1UpdateRSOrPushRefOopClosure update_rs_oop_cl(_g1, |
| 659 _g1->g1_rem_set(), | |
| 660 oops_in_heap_closure, | |
| 661 check_for_refs_into_cset, | |
| 662 worker_i); | |
|
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663 update_rs_oop_cl.set_from(r); |
| 1705 | 664 |
| 4839 | 665 G1TriggerClosure trigger_cl; |
|
3983
811ec3d0833b
7097053: G1: assert(da ? referent->is_oop() : referent->is_oop_or_null()) failed: referenceProcessor.cpp:1054
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|
666 FilterIntoCSClosure into_cs_cl(NULL, _g1, &trigger_cl); |
| 4839 | 667 G1InvokeIfNotTriggeredClosure invoke_cl(&trigger_cl, &into_cs_cl); |
| 668 G1Mux2Closure mux(&invoke_cl, &update_rs_oop_cl); | |
| 1705 | 669 |
| 670 FilterOutOfRegionClosure filter_then_update_rs_oop_cl(r, | |
| 671 (check_for_refs_into_cset ? | |
| 672 (OopClosure*)&mux : | |
| 673 (OopClosure*)&update_rs_oop_cl)); | |
|
890
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|
674 |
|
1666
5cbac8938c4c
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|
675 // The region for the current card may be a young region. The |
|
5cbac8938c4c
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|
676 // current card may have been a card that was evicted from the |
|
5cbac8938c4c
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|
677 // card cache. When the card was inserted into the cache, we had |
|
5cbac8938c4c
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|
678 // determined that its region was non-young. While in the cache, |
|
5cbac8938c4c
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|
679 // the region may have been freed during a cleanup pause, reallocated |
|
5cbac8938c4c
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|
680 // and tagged as young. |
|
5cbac8938c4c
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|
681 // |
|
5cbac8938c4c
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682 // We wish to filter out cards for such a region but the current |
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683 // thread, if we're running concurrently, may "see" the young type |
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684 // change at any time (so an earlier "is_young" check may pass or |
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685 // fail arbitrarily). We tell the iteration code to perform this |
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686 // filtering when it has been determined that there has been an actual |
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687 // allocation in this region and making it safe to check the young type. |
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688 bool filter_young = true; |
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689 |
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690 HeapWord* stop_point = |
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691 r->oops_on_card_seq_iterate_careful(dirtyRegion, |
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692 &filter_then_update_rs_oop_cl, |
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693 filter_young, |
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694 card_ptr); |
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695 |
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696 // If stop_point is non-null, then we encountered an unallocated region |
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697 // (perhaps the unfilled portion of a TLAB.) For now, we'll dirty the |
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698 // card and re-enqueue: if we put off the card until a GC pause, then the |
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699 // unallocated portion will be filled in. Alternatively, we might try |
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700 // the full complexity of the technique used in "regular" precleaning. |
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701 if (stop_point != NULL) { |
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702 // The card might have gotten re-dirtied and re-enqueued while we |
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703 // worked. (In fact, it's pretty likely.) |
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704 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
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705 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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706 MutexLockerEx x(Shared_DirtyCardQ_lock, |
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707 Mutex::_no_safepoint_check_flag); |
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708 DirtyCardQueue* sdcq = |
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709 JavaThread::dirty_card_queue_set().shared_dirty_card_queue(); |
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710 sdcq->enqueue(card_ptr); |
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711 } |
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712 } else { |
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713 _conc_refine_cards++; |
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714 } |
| 1705 | 715 |
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716 // This gets set to true if the card being refined has |
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717 // references that point into the collection set. |
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718 bool has_refs_into_cset = trigger_cl.triggered(); |
| 342 | 719 |
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720 // We should only be detecting that the card contains references |
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721 // that point into the collection set if the current thread is |
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722 // a GC worker thread. |
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723 assert(!has_refs_into_cset || SafepointSynchronize::is_at_safepoint(), |
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724 "invalid result at non safepoint"); |
| 1705 | 725 |
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726 return has_refs_into_cset; |
| 342 | 727 } |
| 728 | |
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729 void G1RemSet::print_periodic_summary_info(const char* header) { |
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730 G1RemSetSummary current; |
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731 current.initialize(this); |
| 342 | 732 |
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733 _prev_period_summary.subtract_from(¤t); |
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734 print_summary_info(&_prev_period_summary, header); |
| 342 | 735 |
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736 _prev_period_summary.set(¤t); |
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737 } |
| 794 | 738 |
| 1861 | 739 void G1RemSet::print_summary_info() { |
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740 G1RemSetSummary current; |
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741 current.initialize(this); |
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742 |
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743 print_summary_info(¤t, " Cumulative RS summary"); |
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744 } |
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745 |
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746 void G1RemSet::print_summary_info(G1RemSetSummary * summary, const char * header) { |
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747 assert(summary != NULL, "just checking"); |
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748 |
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749 if (header != NULL) { |
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750 gclog_or_tty->print_cr("%s", header); |
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751 } |
| 342 | 752 |
| 753 #if CARD_REPEAT_HISTO | |
| 754 gclog_or_tty->print_cr("\nG1 card_repeat count histogram: "); | |
| 755 gclog_or_tty->print_cr(" # of repeats --> # of cards with that number."); | |
| 756 card_repeat_count.print_on(gclog_or_tty); | |
| 757 #endif | |
| 758 | |
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759 summary->print_on(gclog_or_tty); |
| 342 | 760 } |
| 1705 | 761 |
| 1861 | 762 void G1RemSet::prepare_for_verify() { |
|
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763 if (G1HRRSFlushLogBuffersOnVerify && |
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764 (VerifyBeforeGC || VerifyAfterGC) |
|
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765 && (!_g1->full_collection() || G1VerifyRSetsDuringFullGC)) { |
| 342 | 766 cleanupHRRS(); |
| 767 _g1->set_refine_cte_cl_concurrency(false); | |
| 768 if (SafepointSynchronize::is_at_safepoint()) { | |
| 769 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 770 dcqs.concatenate_logs(); | |
| 771 } | |
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772 |
|
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773 G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
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774 bool use_hot_card_cache = hot_card_cache->use_cache(); |
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775 hot_card_cache->set_use_cache(false); |
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776 |
| 1705 | 777 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); |
| 778 updateRS(&into_cset_dcq, 0); | |
| 779 _g1->into_cset_dirty_card_queue_set().clear(); | |
|
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780 |
|
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781 hot_card_cache->set_use_cache(use_hot_card_cache); |
|
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782 assert(JavaThread::dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
| 342 | 783 } |
| 784 } |