Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1RemSet.cpp @ 22906:ad32e85474ff
8051837: Remove temporary G1UseParallelRSetUpdating and G1UseParallelRSetScanning flags
Reviewed-by: stefank, tschatzl
Contributed-by: marcus.larsson@oracle.com
| author | brutisso |
|---|---|
| date | Thu, 07 Aug 2014 09:35:08 +0200 |
| parents | 8e9ede9dd2cd |
| children | c3fcc09c9239 |
| 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" | |
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35 #include "gc_implementation/g1/heapRegionManager.inline.hpp" |
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36 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
| 1972 | 37 #include "memory/iterator.hpp" |
| 38 #include "oops/oop.inline.hpp" | |
| 39 #include "utilities/intHisto.hpp" | |
| 342 | 40 |
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41 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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42 |
| 342 | 43 #define CARD_REPEAT_HISTO 0 |
| 44 | |
| 45 #if CARD_REPEAT_HISTO | |
| 46 static size_t ct_freq_sz; | |
| 47 static jbyte* ct_freq = NULL; | |
| 48 | |
| 49 void init_ct_freq_table(size_t heap_sz_bytes) { | |
| 50 if (ct_freq == NULL) { | |
| 51 ct_freq_sz = heap_sz_bytes/CardTableModRefBS::card_size; | |
| 52 ct_freq = new jbyte[ct_freq_sz]; | |
| 53 for (size_t j = 0; j < ct_freq_sz; j++) ct_freq[j] = 0; | |
| 54 } | |
| 55 } | |
| 56 | |
| 57 void ct_freq_note_card(size_t index) { | |
| 58 assert(0 <= index && index < ct_freq_sz, "Bounds error."); | |
| 59 if (ct_freq[index] < 100) { ct_freq[index]++; } | |
| 60 } | |
| 61 | |
| 62 static IntHistogram card_repeat_count(10, 10); | |
| 63 | |
| 64 void ct_freq_update_histo_and_reset() { | |
| 65 for (size_t j = 0; j < ct_freq_sz; j++) { | |
| 66 card_repeat_count.add_entry(ct_freq[j]); | |
| 67 ct_freq[j] = 0; | |
| 68 } | |
| 69 | |
| 70 } | |
| 71 #endif | |
| 72 | |
| 1861 | 73 G1RemSet::G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs) |
| 74 : _g1(g1), _conc_refine_cards(0), | |
| 75 _ct_bs(ct_bs), _g1p(_g1->g1_policy()), | |
| 342 | 76 _cg1r(g1->concurrent_g1_refine()), |
| 1705 | 77 _cset_rs_update_cl(NULL), |
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78 _cards_scanned(NULL), _total_cards_scanned(0), |
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79 _prev_period_summary() |
| 342 | 80 { |
| 81 _seq_task = new SubTasksDone(NumSeqTasks); | |
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82 guarantee(n_workers() > 0, "There should be some workers"); |
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83 _cset_rs_update_cl = NEW_C_HEAP_ARRAY(G1ParPushHeapRSClosure*, 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 } |
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97 FREE_C_HEAP_ARRAY(G1ParPushHeapRSClosure*, _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 |
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111 G1ParPushHeapRSClosure* _oc; |
| 20494 | 112 CodeBlobClosure* _code_root_cl; |
| 12080 | 113 |
| 342 | 114 G1BlockOffsetSharedArray* _bot_shared; |
| 12343 | 115 G1SATBCardTableModRefBS *_ct_bs; |
| 12080 | 116 |
| 117 double _strong_code_root_scan_time_sec; | |
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118 uint _worker_i; |
| 12080 | 119 int _block_size; |
| 120 bool _try_claimed; | |
| 121 | |
| 342 | 122 public: |
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123 ScanRSClosure(G1ParPushHeapRSClosure* oc, |
| 20494 | 124 CodeBlobClosure* code_root_cl, |
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125 uint worker_i) : |
| 342 | 126 _oc(oc), |
| 12080 | 127 _code_root_cl(code_root_cl), |
| 128 _strong_code_root_scan_time_sec(0.0), | |
| 342 | 129 _cards(0), |
| 130 _cards_done(0), | |
| 131 _worker_i(worker_i), | |
| 132 _try_claimed(false) | |
| 133 { | |
| 134 _g1h = G1CollectedHeap::heap(); | |
| 135 _bot_shared = _g1h->bot_shared(); | |
| 12343 | 136 _ct_bs = _g1h->g1_barrier_set(); |
| 1261 | 137 _block_size = MAX2<int>(G1RSetScanBlockSize, 1); |
| 342 | 138 } |
| 139 | |
| 140 void set_try_claimed() { _try_claimed = true; } | |
| 141 | |
| 142 void scanCard(size_t index, HeapRegion *r) { | |
| 4023 | 143 // Stack allocate the DirtyCardToOopClosure instance |
| 144 HeapRegionDCTOC cl(_g1h, r, _oc, | |
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145 CardTableModRefBS::Precise); |
| 342 | 146 |
| 147 // Set the "from" region in the closure. | |
| 148 _oc->set_region(r); | |
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149 MemRegion card_region(_bot_shared->address_for_index(index), G1BlockOffsetSharedArray::N_words); |
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150 MemRegion pre_gc_allocated(r->bottom(), r->scan_top()); |
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151 MemRegion mr = pre_gc_allocated.intersection(card_region); |
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152 if (!mr.is_empty() && !_ct_bs->is_card_claimed(index)) { |
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153 // We make the card as "claimed" lazily (so races are possible |
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154 // but they're benign), which reduces the number of duplicate |
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155 // scans (the rsets of the regions in the cset can intersect). |
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156 _ct_bs->set_card_claimed(index); |
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157 _cards_done++; |
| 4023 | 158 cl.do_MemRegion(mr); |
| 342 | 159 } |
| 160 } | |
| 161 | |
| 162 void printCard(HeapRegion* card_region, size_t card_index, | |
| 163 HeapWord* card_start) { | |
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164 gclog_or_tty->print_cr("T " UINT32_FORMAT " Region [" PTR_FORMAT ", " PTR_FORMAT ") " |
| 342 | 165 "RS names card %p: " |
| 166 "[" PTR_FORMAT ", " PTR_FORMAT ")", | |
| 167 _worker_i, | |
| 168 card_region->bottom(), card_region->end(), | |
| 169 card_index, | |
| 170 card_start, card_start + G1BlockOffsetSharedArray::N_words); | |
| 171 } | |
| 172 | |
| 12080 | 173 void scan_strong_code_roots(HeapRegion* r) { |
| 174 double scan_start = os::elapsedTime(); | |
| 175 r->strong_code_roots_do(_code_root_cl); | |
| 176 _strong_code_root_scan_time_sec += (os::elapsedTime() - scan_start); | |
| 177 } | |
| 178 | |
| 342 | 179 bool doHeapRegion(HeapRegion* r) { |
| 180 assert(r->in_collection_set(), "should only be called on elements of CS."); | |
| 181 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 182 if (hrrs->iter_is_complete()) return false; // All done. | |
| 183 if (!_try_claimed && !hrrs->claim_iter()) return false; | |
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184 // If we ever free the collection set concurrently, we should also |
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185 // clear the card table concurrently therefore we won't need to |
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186 // add regions of the collection set to the dirty cards region. |
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187 _g1h->push_dirty_cards_region(r); |
| 342 | 188 // If we didn't return above, then |
| 189 // _try_claimed || r->claim_iter() | |
| 190 // is true: either we're supposed to work on claimed-but-not-complete | |
| 191 // regions, or we successfully claimed the region. | |
| 12080 | 192 |
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193 HeapRegionRemSetIterator iter(hrrs); |
| 342 | 194 size_t card_index; |
| 1261 | 195 |
| 196 // We claim cards in block so as to recude the contention. The block size is determined by | |
| 197 // the G1RSetScanBlockSize parameter. | |
| 198 size_t jump_to_card = hrrs->iter_claimed_next(_block_size); | |
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199 for (size_t current_card = 0; iter.has_next(card_index); current_card++) { |
| 1261 | 200 if (current_card >= jump_to_card + _block_size) { |
| 201 jump_to_card = hrrs->iter_claimed_next(_block_size); | |
| 747 | 202 } |
| 1261 | 203 if (current_card < jump_to_card) continue; |
| 342 | 204 HeapWord* card_start = _g1h->bot_shared()->address_for_index(card_index); |
| 205 #if 0 | |
| 206 gclog_or_tty->print("Rem set iteration yielded card [" PTR_FORMAT ", " PTR_FORMAT ").\n", | |
| 207 card_start, card_start + CardTableModRefBS::card_size_in_words); | |
| 208 #endif | |
| 209 | |
| 210 HeapRegion* card_region = _g1h->heap_region_containing(card_start); | |
| 211 _cards++; | |
| 212 | |
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213 if (!card_region->is_on_dirty_cards_region_list()) { |
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214 _g1h->push_dirty_cards_region(card_region); |
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215 } |
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216 |
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217 // If the card is dirty, then we will scan it during updateRS. |
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218 if (!card_region->in_collection_set() && |
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219 !_ct_bs->is_card_dirty(card_index)) { |
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220 scanCard(card_index, card_region); |
| 342 | 221 } |
| 222 } | |
| 747 | 223 if (!_try_claimed) { |
| 12080 | 224 // Scan the strong code root list attached to the current region |
| 225 scan_strong_code_roots(r); | |
| 226 | |
| 747 | 227 hrrs->set_iter_complete(); |
| 228 } | |
| 342 | 229 return false; |
| 230 } | |
| 12080 | 231 |
| 232 double strong_code_root_scan_time_sec() { | |
| 233 return _strong_code_root_scan_time_sec; | |
| 234 } | |
| 235 | |
| 342 | 236 size_t cards_done() { return _cards_done;} |
| 237 size_t cards_looked_up() { return _cards;} | |
| 238 }; | |
| 239 | |
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240 void G1RemSet::scanRS(G1ParPushHeapRSClosure* oc, |
| 20494 | 241 CodeBlobClosure* code_root_cl, |
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242 uint worker_i) { |
| 342 | 243 double rs_time_start = os::elapsedTime(); |
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244 HeapRegion *startRegion = _g1->start_cset_region_for_worker(worker_i); |
| 342 | 245 |
| 12080 | 246 ScanRSClosure scanRScl(oc, code_root_cl, worker_i); |
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247 |
| 342 | 248 _g1->collection_set_iterate_from(startRegion, &scanRScl); |
| 249 scanRScl.set_try_claimed(); | |
| 250 _g1->collection_set_iterate_from(startRegion, &scanRScl); | |
| 251 | |
| 12080 | 252 double scan_rs_time_sec = (os::elapsedTime() - rs_time_start) |
| 253 - scanRScl.strong_code_root_scan_time_sec(); | |
| 342 | 254 |
| 12080 | 255 assert(_cards_scanned != NULL, "invariant"); |
| 342 | 256 _cards_scanned[worker_i] = scanRScl.cards_done(); |
| 257 | |
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258 _g1p->phase_times()->record_scan_rs_time(worker_i, scan_rs_time_sec * 1000.0); |
| 12080 | 259 _g1p->phase_times()->record_strong_code_root_scan_time(worker_i, |
| 260 scanRScl.strong_code_root_scan_time_sec() * 1000.0); | |
| 342 | 261 } |
| 262 | |
| 1705 | 263 // Closure used for updating RSets and recording references that |
| 264 // point into the collection set. Only called during an | |
| 265 // evacuation pause. | |
| 266 | |
| 267 class RefineRecordRefsIntoCSCardTableEntryClosure: public CardTableEntryClosure { | |
| 268 G1RemSet* _g1rs; | |
| 269 DirtyCardQueue* _into_cset_dcq; | |
| 270 public: | |
| 271 RefineRecordRefsIntoCSCardTableEntryClosure(G1CollectedHeap* g1h, | |
| 272 DirtyCardQueue* into_cset_dcq) : | |
| 273 _g1rs(g1h->g1_rem_set()), _into_cset_dcq(into_cset_dcq) | |
| 274 {} | |
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275 bool do_card_ptr(jbyte* card_ptr, uint worker_i) { |
| 1705 | 276 // The only time we care about recording cards that |
| 277 // contain references that point into the collection set | |
| 278 // is during RSet updating within an evacuation pause. | |
| 279 // In this case worker_i should be the id of a GC worker thread. | |
| 280 assert(SafepointSynchronize::is_at_safepoint(), "not during an evacuation pause"); | |
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281 assert(worker_i < (ParallelGCThreads == 0 ? 1 : ParallelGCThreads), "should be a GC worker"); |
| 342 | 282 |
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283 if (_g1rs->refine_card(card_ptr, worker_i, true)) { |
| 1705 | 284 // 'card_ptr' contains references that point into the collection |
| 285 // set. We need to record the card in the DCQS | |
| 286 // (G1CollectedHeap::into_cset_dirty_card_queue_set()) | |
| 287 // that's used for that purpose. | |
| 288 // | |
| 289 // Enqueue the card | |
| 290 _into_cset_dcq->enqueue(card_ptr); | |
| 291 } | |
| 292 return true; | |
| 293 } | |
| 294 }; | |
| 295 | |
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296 void G1RemSet::updateRS(DirtyCardQueue* into_cset_dcq, uint worker_i) { |
| 342 | 297 double start = os::elapsedTime(); |
| 1705 | 298 // Apply the given closure to all remaining log entries. |
| 299 RefineRecordRefsIntoCSCardTableEntryClosure into_cset_update_rs_cl(_g1, into_cset_dcq); | |
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300 |
| 1705 | 301 _g1->iterate_dirty_card_closure(&into_cset_update_rs_cl, into_cset_dcq, false, worker_i); |
| 302 | |
| 794 | 303 // Now there should be no dirty cards. |
| 304 if (G1RSLogCheckCardTable) { | |
| 305 CountNonCleanMemRegionClosure cl(_g1); | |
| 306 _ct_bs->mod_card_iterate(&cl); | |
| 307 // XXX This isn't true any more: keeping cards of young regions | |
| 308 // marked dirty broke it. Need some reasonable fix. | |
| 309 guarantee(cl.n() == 0, "Card table should be clean."); | |
| 342 | 310 } |
| 794 | 311 |
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312 _g1p->phase_times()->record_update_rs_time(worker_i, (os::elapsedTime() - start) * 1000.0); |
| 342 | 313 } |
| 314 | |
| 1861 | 315 void G1RemSet::cleanupHRRS() { |
| 342 | 316 HeapRegionRemSet::cleanup(); |
| 317 } | |
| 318 | |
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319 void G1RemSet::oops_into_collection_set_do(G1ParPushHeapRSClosure* oc, |
| 20494 | 320 CodeBlobClosure* code_root_cl, |
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321 uint worker_i) { |
| 342 | 322 #if CARD_REPEAT_HISTO |
| 323 ct_freq_update_histo_and_reset(); | |
| 324 #endif | |
| 325 | |
| 1705 | 326 // We cache the value of 'oc' closure into the appropriate slot in the |
| 327 // _cset_rs_update_cl for this worker | |
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328 assert(worker_i < n_workers(), "sanity"); |
| 1705 | 329 _cset_rs_update_cl[worker_i] = oc; |
| 330 | |
| 331 // A DirtyCardQueue that is used to hold cards containing references | |
| 332 // that point into the collection set. This DCQ is associated with a | |
| 333 // special DirtyCardQueueSet (see g1CollectedHeap.hpp). Under normal | |
| 334 // circumstances (i.e. the pause successfully completes), these cards | |
| 335 // are just discarded (there's no need to update the RSets of regions | |
| 336 // that were in the collection set - after the pause these regions | |
| 337 // are wholly 'free' of live objects. In the event of an evacuation | |
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338 // failure the cards/buffers in this queue set are passed to the |
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339 // DirtyCardQueueSet that is used to manage RSet updates |
| 1705 | 340 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); |
| 341 | |
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342 assert((ParallelGCThreads > 0) || worker_i == 0, "invariant"); |
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343 |
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344 updateRS(&into_cset_dcq, worker_i); |
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345 scanRS(oc, code_root_cl, worker_i); |
| 1705 | 346 |
| 347 // We now clear the cached values of _cset_rs_update_cl for this worker | |
| 348 _cset_rs_update_cl[worker_i] = NULL; | |
| 342 | 349 } |
| 350 | |
| 1861 | 351 void G1RemSet::prepare_for_oops_into_collection_set_do() { |
| 342 | 352 cleanupHRRS(); |
| 353 _g1->set_refine_cte_cl_concurrency(false); | |
| 354 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 355 dcqs.concatenate_logs(); | |
| 356 | |
| 357 guarantee( _cards_scanned == NULL, "invariant" ); | |
| 6197 | 358 _cards_scanned = NEW_C_HEAP_ARRAY(size_t, n_workers(), mtGC); |
| 545 | 359 for (uint i = 0; i < n_workers(); ++i) { |
| 360 _cards_scanned[i] = 0; | |
| 361 } | |
| 342 | 362 _total_cards_scanned = 0; |
| 363 } | |
| 364 | |
| 1861 | 365 void G1RemSet::cleanup_after_oops_into_collection_set_do() { |
| 342 | 366 guarantee( _cards_scanned != NULL, "invariant" ); |
| 367 _total_cards_scanned = 0; | |
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368 for (uint i = 0; i < n_workers(); ++i) { |
| 342 | 369 _total_cards_scanned += _cards_scanned[i]; |
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370 } |
| 6197 | 371 FREE_C_HEAP_ARRAY(size_t, _cards_scanned, mtGC); |
| 342 | 372 _cards_scanned = NULL; |
| 373 // Cleanup after copy | |
| 374 _g1->set_refine_cte_cl_concurrency(true); | |
| 375 // Set all cards back to clean. | |
| 376 _g1->cleanUpCardTable(); | |
| 794 | 377 |
| 1705 | 378 DirtyCardQueueSet& into_cset_dcqs = _g1->into_cset_dirty_card_queue_set(); |
| 379 int into_cset_n_buffers = into_cset_dcqs.completed_buffers_num(); | |
| 380 | |
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381 if (_g1->evacuation_failed()) { |
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382 double restore_remembered_set_start = os::elapsedTime(); |
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383 |
| 1705 | 384 // Restore remembered sets for the regions pointing into the collection set. |
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385 // We just need to transfer the completed buffers from the DirtyCardQueueSet |
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386 // used to hold cards that contain references that point into the collection set |
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387 // to the DCQS used to hold the deferred RS updates. |
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388 _g1->dirty_card_queue_set().merge_bufferlists(&into_cset_dcqs); |
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389 _g1->g1_policy()->phase_times()->record_evac_fail_restore_remsets((os::elapsedTime() - restore_remembered_set_start) * 1000.0); |
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390 } |
| 1705 | 391 |
| 392 // Free any completed buffers in the DirtyCardQueueSet used to hold cards | |
| 393 // which contain references that point into the collection. | |
| 394 _g1->into_cset_dirty_card_queue_set().clear(); | |
| 395 assert(_g1->into_cset_dirty_card_queue_set().completed_buffers_num() == 0, | |
| 396 "all buffers should be freed"); | |
| 397 _g1->into_cset_dirty_card_queue_set().clear_n_completed_buffers(); | |
| 342 | 398 } |
| 399 | |
| 400 class ScrubRSClosure: public HeapRegionClosure { | |
| 401 G1CollectedHeap* _g1h; | |
| 402 BitMap* _region_bm; | |
| 403 BitMap* _card_bm; | |
| 404 CardTableModRefBS* _ctbs; | |
| 405 public: | |
| 406 ScrubRSClosure(BitMap* region_bm, BitMap* card_bm) : | |
| 407 _g1h(G1CollectedHeap::heap()), | |
| 408 _region_bm(region_bm), _card_bm(card_bm), | |
| 12343 | 409 _ctbs(_g1h->g1_barrier_set()) {} |
| 342 | 410 |
| 411 bool doHeapRegion(HeapRegion* r) { | |
| 412 if (!r->continuesHumongous()) { | |
| 413 r->rem_set()->scrub(_ctbs, _region_bm, _card_bm); | |
| 414 } | |
| 415 return false; | |
| 416 } | |
| 417 }; | |
| 418 | |
| 1861 | 419 void G1RemSet::scrub(BitMap* region_bm, BitMap* card_bm) { |
| 342 | 420 ScrubRSClosure scrub_cl(region_bm, card_bm); |
| 421 _g1->heap_region_iterate(&scrub_cl); | |
| 422 } | |
| 423 | |
| 1861 | 424 void G1RemSet::scrub_par(BitMap* region_bm, BitMap* card_bm, |
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425 uint worker_num, int claim_val) { |
| 342 | 426 ScrubRSClosure scrub_cl(region_bm, card_bm); |
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427 _g1->heap_region_par_iterate_chunked(&scrub_cl, |
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428 worker_num, |
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429 n_workers(), |
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430 claim_val); |
| 342 | 431 } |
| 432 | |
| 4839 | 433 G1TriggerClosure::G1TriggerClosure() : |
| 434 _triggered(false) { } | |
| 435 | |
| 436 G1InvokeIfNotTriggeredClosure::G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t_cl, | |
| 437 OopClosure* oop_cl) : | |
| 438 _trigger_cl(t_cl), _oop_cl(oop_cl) { } | |
| 1705 | 439 |
| 4839 | 440 G1Mux2Closure::G1Mux2Closure(OopClosure *c1, OopClosure *c2) : |
| 441 _c1(c1), _c2(c2) { } | |
| 1705 | 442 |
| 4839 | 443 G1UpdateRSOrPushRefOopClosure:: |
| 444 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h, | |
| 445 G1RemSet* rs, | |
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446 G1ParPushHeapRSClosure* push_ref_cl, |
| 4839 | 447 bool record_refs_into_cset, |
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448 uint worker_i) : |
| 4839 | 449 _g1(g1h), _g1_rem_set(rs), _from(NULL), |
| 450 _record_refs_into_cset(record_refs_into_cset), | |
| 451 _push_ref_cl(push_ref_cl), _worker_i(worker_i) { } | |
| 1705 | 452 |
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453 // Returns true if the given card contains references that point |
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454 // into the collection set, if we're checking for such references; |
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455 // false otherwise. |
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456 |
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457 bool G1RemSet::refine_card(jbyte* card_ptr, uint worker_i, |
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458 bool check_for_refs_into_cset) { |
| 20337 | 459 assert(_g1->is_in_exact(_ct_bs->addr_for(card_ptr)), |
| 460 err_msg("Card at "PTR_FORMAT" index "SIZE_FORMAT" representing heap at "PTR_FORMAT" (%u) must be in committed heap", | |
| 461 p2i(card_ptr), | |
| 462 _ct_bs->index_for(_ct_bs->addr_for(card_ptr)), | |
| 463 _ct_bs->addr_for(card_ptr), | |
| 464 _g1->addr_to_region(_ct_bs->addr_for(card_ptr)))); | |
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465 |
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466 // If the card is no longer dirty, nothing to do. |
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467 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
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468 // No need to return that this card contains refs that point |
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469 // into the collection set. |
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470 return false; |
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471 } |
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472 |
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473 // Construct the region representing the card. |
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474 HeapWord* start = _ct_bs->addr_for(card_ptr); |
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475 // And find the region containing it. |
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476 HeapRegion* r = _g1->heap_region_containing(start); |
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477 |
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478 // Why do we have to check here whether a card is on a young region, |
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479 // given that we dirty young regions and, as a result, the |
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480 // post-barrier is supposed to filter them out and never to enqueue |
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481 // them? When we allocate a new region as the "allocation region" we |
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482 // actually dirty its cards after we release the lock, since card |
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483 // dirtying while holding the lock was a performance bottleneck. So, |
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484 // as a result, it is possible for other threads to actually |
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485 // allocate objects in the region (after the acquire the lock) |
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486 // before all the cards on the region are dirtied. This is unlikely, |
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487 // and it doesn't happen often, but it can happen. So, the extra |
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488 // check below filters out those cards. |
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489 if (r->is_young()) { |
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490 return false; |
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491 } |
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492 |
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493 // While we are processing RSet buffers during the collection, we |
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494 // actually don't want to scan any cards on the collection set, |
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495 // since we don't want to update remebered sets with entries that |
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496 // point into the collection set, given that live objects from the |
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497 // collection set are about to move and such entries will be stale |
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498 // very soon. This change also deals with a reliability issue which |
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499 // involves scanning a card in the collection set and coming across |
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500 // an array that was being chunked and looking malformed. Note, |
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501 // however, that if evacuation fails, we have to scan any objects |
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502 // that were not moved and create any missing entries. |
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503 if (r->in_collection_set()) { |
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504 return false; |
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505 } |
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506 |
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507 // The result from the hot card cache insert call is either: |
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508 // * pointer to the current card |
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509 // (implying that the current card is not 'hot'), |
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510 // * null |
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511 // (meaning we had inserted the card ptr into the "hot" card cache, |
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512 // which had some headroom), |
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513 // * a pointer to a "hot" card that was evicted from the "hot" cache. |
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514 // |
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515 |
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516 G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
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517 if (hot_card_cache->use_cache()) { |
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518 assert(!check_for_refs_into_cset, "sanity"); |
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519 assert(!SafepointSynchronize::is_at_safepoint(), "sanity"); |
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520 |
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521 card_ptr = hot_card_cache->insert(card_ptr); |
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522 if (card_ptr == NULL) { |
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523 // There was no eviction. Nothing to do. |
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524 return false; |
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525 } |
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526 |
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527 start = _ct_bs->addr_for(card_ptr); |
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528 r = _g1->heap_region_containing(start); |
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529 |
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530 // Checking whether the region we got back from the cache |
|
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531 // is young here is inappropriate. The region could have been |
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532 // freed, reallocated and tagged as young while in the cache. |
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533 // Hence we could see its young type change at any time. |
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534 } |
|
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535 |
|
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536 // Don't use addr_for(card_ptr + 1) which can ask for |
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537 // a card beyond the heap. This is not safe without a perm |
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538 // gen at the upper end of the heap. |
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539 HeapWord* end = start + CardTableModRefBS::card_size_in_words; |
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540 MemRegion dirtyRegion(start, end); |
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541 |
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542 #if CARD_REPEAT_HISTO |
|
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543 init_ct_freq_table(_g1->max_capacity()); |
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544 ct_freq_note_card(_ct_bs->index_for(start)); |
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545 #endif |
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546 |
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547 G1ParPushHeapRSClosure* oops_in_heap_closure = NULL; |
|
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548 if (check_for_refs_into_cset) { |
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549 // ConcurrentG1RefineThreads have worker numbers larger than what |
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550 // _cset_rs_update_cl[] is set up to handle. But those threads should |
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551 // only be active outside of a collection which means that when they |
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552 // reach here they should have check_for_refs_into_cset == false. |
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553 assert((size_t)worker_i < n_workers(), "index of worker larger than _cset_rs_update_cl[].length"); |
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554 oops_in_heap_closure = _cset_rs_update_cl[worker_i]; |
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555 } |
| 4839 | 556 G1UpdateRSOrPushRefOopClosure update_rs_oop_cl(_g1, |
| 557 _g1->g1_rem_set(), | |
| 558 oops_in_heap_closure, | |
| 559 check_for_refs_into_cset, | |
| 560 worker_i); | |
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561 update_rs_oop_cl.set_from(r); |
| 1705 | 562 |
| 4839 | 563 G1TriggerClosure trigger_cl; |
|
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564 FilterIntoCSClosure into_cs_cl(NULL, _g1, &trigger_cl); |
| 4839 | 565 G1InvokeIfNotTriggeredClosure invoke_cl(&trigger_cl, &into_cs_cl); |
| 566 G1Mux2Closure mux(&invoke_cl, &update_rs_oop_cl); | |
| 1705 | 567 |
| 568 FilterOutOfRegionClosure filter_then_update_rs_oop_cl(r, | |
| 569 (check_for_refs_into_cset ? | |
| 570 (OopClosure*)&mux : | |
| 571 (OopClosure*)&update_rs_oop_cl)); | |
|
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572 |
|
1666
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|
573 // The region for the current card may be a young region. The |
|
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574 // current card may have been a card that was evicted from the |
|
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575 // card cache. When the card was inserted into the cache, we had |
|
5cbac8938c4c
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576 // determined that its region was non-young. While in the cache, |
|
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577 // the region may have been freed during a cleanup pause, reallocated |
|
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578 // and tagged as young. |
|
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|
579 // |
|
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580 // We wish to filter out cards for such a region but the current |
|
3317
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|
581 // thread, if we're running concurrently, may "see" the young type |
|
1666
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|
582 // change at any time (so an earlier "is_young" check may pass or |
|
5cbac8938c4c
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|
583 // fail arbitrarily). We tell the iteration code to perform this |
|
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|
584 // filtering when it has been determined that there has been an actual |
|
5cbac8938c4c
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|
585 // allocation in this region and making it safe to check the young type. |
|
5cbac8938c4c
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|
586 bool filter_young = true; |
|
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587 |
|
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588 HeapWord* stop_point = |
|
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589 r->oops_on_card_seq_iterate_careful(dirtyRegion, |
|
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|
590 &filter_then_update_rs_oop_cl, |
|
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|
591 filter_young, |
|
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|
592 card_ptr); |
|
1666
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593 |
|
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|
594 // If stop_point is non-null, then we encountered an unallocated region |
|
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|
595 // (perhaps the unfilled portion of a TLAB.) For now, we'll dirty the |
|
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596 // card and re-enqueue: if we put off the card until a GC pause, then the |
|
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|
597 // unallocated portion will be filled in. Alternatively, we might try |
|
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|
598 // the full complexity of the technique used in "regular" precleaning. |
|
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|
599 if (stop_point != NULL) { |
|
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|
600 // The card might have gotten re-dirtied and re-enqueued while we |
|
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|
601 // worked. (In fact, it's pretty likely.) |
|
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602 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
|
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|
603 *card_ptr = CardTableModRefBS::dirty_card_val(); |
|
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|
604 MutexLockerEx x(Shared_DirtyCardQ_lock, |
|
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|
605 Mutex::_no_safepoint_check_flag); |
|
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|
606 DirtyCardQueue* sdcq = |
|
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607 JavaThread::dirty_card_queue_set().shared_dirty_card_queue(); |
|
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608 sdcq->enqueue(card_ptr); |
|
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|
609 } |
|
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610 } else { |
|
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|
611 _conc_refine_cards++; |
|
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612 } |
| 1705 | 613 |
|
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|
614 // This gets set to true if the card being refined has |
|
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|
615 // references that point into the collection set. |
|
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|
616 bool has_refs_into_cset = trigger_cl.triggered(); |
| 342 | 617 |
|
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|
618 // We should only be detecting that the card contains references |
|
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619 // that point into the collection set if the current thread is |
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620 // a GC worker thread. |
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621 assert(!has_refs_into_cset || SafepointSynchronize::is_at_safepoint(), |
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622 "invalid result at non safepoint"); |
| 1705 | 623 |
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624 return has_refs_into_cset; |
| 342 | 625 } |
| 626 | |
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627 void G1RemSet::print_periodic_summary_info(const char* header) { |
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628 G1RemSetSummary current; |
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629 current.initialize(this); |
| 342 | 630 |
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631 _prev_period_summary.subtract_from(¤t); |
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632 print_summary_info(&_prev_period_summary, header); |
| 342 | 633 |
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634 _prev_period_summary.set(¤t); |
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635 } |
| 794 | 636 |
| 1861 | 637 void G1RemSet::print_summary_info() { |
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638 G1RemSetSummary current; |
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639 current.initialize(this); |
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640 |
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641 print_summary_info(¤t, " Cumulative RS summary"); |
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642 } |
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643 |
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644 void G1RemSet::print_summary_info(G1RemSetSummary * summary, const char * header) { |
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645 assert(summary != NULL, "just checking"); |
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646 |
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647 if (header != NULL) { |
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648 gclog_or_tty->print_cr("%s", header); |
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649 } |
| 342 | 650 |
| 651 #if CARD_REPEAT_HISTO | |
| 652 gclog_or_tty->print_cr("\nG1 card_repeat count histogram: "); | |
| 653 gclog_or_tty->print_cr(" # of repeats --> # of cards with that number."); | |
| 654 card_repeat_count.print_on(gclog_or_tty); | |
| 655 #endif | |
| 656 | |
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657 summary->print_on(gclog_or_tty); |
| 342 | 658 } |
| 1705 | 659 |
| 1861 | 660 void G1RemSet::prepare_for_verify() { |
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661 if (G1HRRSFlushLogBuffersOnVerify && |
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662 (VerifyBeforeGC || VerifyAfterGC) |
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663 && (!_g1->full_collection() || G1VerifyRSetsDuringFullGC)) { |
| 342 | 664 cleanupHRRS(); |
| 665 _g1->set_refine_cte_cl_concurrency(false); | |
| 666 if (SafepointSynchronize::is_at_safepoint()) { | |
| 667 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 668 dcqs.concatenate_logs(); | |
| 669 } | |
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670 |
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671 G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
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672 bool use_hot_card_cache = hot_card_cache->use_cache(); |
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673 hot_card_cache->set_use_cache(false); |
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674 |
| 1705 | 675 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); |
| 676 updateRS(&into_cset_dcq, 0); | |
| 677 _g1->into_cset_dirty_card_queue_set().clear(); | |
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678 |
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679 hot_card_cache->set_use_cache(use_hot_card_cache); |
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680 assert(JavaThread::dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
| 342 | 681 } |
| 682 } |