Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1RemSet.cpp @ 22909:38d6febe66af
8075210: Refactor strong root processing in order to allow G1 to evolve separately from GenCollectedHeap
Summary: Create a G1RootProcessor and move SharedHeap root processing to GenCollectedHeap
Reviewed-by: brutisso, tschatzl, ehelin
| author | mgerdin |
|---|---|
| date | Mon, 01 Dec 2014 15:24:56 +0100 |
| parents | c3fcc09c9239 |
| children | ea47136e6ea4 |
| 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 { |
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81 guarantee(n_workers() > 0, "There should be some workers"); |
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82 _cset_rs_update_cl = NEW_C_HEAP_ARRAY(G1ParPushHeapRSClosure*, 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() { |
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92 for (uint i = 0; i < n_workers(); i++) { |
| 1705 | 93 assert(_cset_rs_update_cl[i] == NULL, "it should be"); |
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94 } |
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95 FREE_C_HEAP_ARRAY(G1ParPushHeapRSClosure*, _cset_rs_update_cl, mtGC); |
| 342 | 96 } |
| 97 | |
| 98 void CountNonCleanMemRegionClosure::do_MemRegion(MemRegion mr) { | |
| 99 if (_g1->is_in_g1_reserved(mr.start())) { | |
| 100 _n += (int) ((mr.byte_size() / CardTableModRefBS::card_size)); | |
| 101 if (_start_first == NULL) _start_first = mr.start(); | |
| 102 } | |
| 103 } | |
| 104 | |
| 105 class ScanRSClosure : public HeapRegionClosure { | |
| 106 size_t _cards_done, _cards; | |
| 107 G1CollectedHeap* _g1h; | |
| 12080 | 108 |
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109 G1ParPushHeapRSClosure* _oc; |
| 20494 | 110 CodeBlobClosure* _code_root_cl; |
| 12080 | 111 |
| 342 | 112 G1BlockOffsetSharedArray* _bot_shared; |
| 12343 | 113 G1SATBCardTableModRefBS *_ct_bs; |
| 12080 | 114 |
| 115 double _strong_code_root_scan_time_sec; | |
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116 uint _worker_i; |
| 12080 | 117 int _block_size; |
| 118 bool _try_claimed; | |
| 119 | |
| 342 | 120 public: |
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121 ScanRSClosure(G1ParPushHeapRSClosure* oc, |
| 20494 | 122 CodeBlobClosure* code_root_cl, |
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123 uint worker_i) : |
| 342 | 124 _oc(oc), |
| 12080 | 125 _code_root_cl(code_root_cl), |
| 126 _strong_code_root_scan_time_sec(0.0), | |
| 342 | 127 _cards(0), |
| 128 _cards_done(0), | |
| 129 _worker_i(worker_i), | |
| 130 _try_claimed(false) | |
| 131 { | |
| 132 _g1h = G1CollectedHeap::heap(); | |
| 133 _bot_shared = _g1h->bot_shared(); | |
| 12343 | 134 _ct_bs = _g1h->g1_barrier_set(); |
| 1261 | 135 _block_size = MAX2<int>(G1RSetScanBlockSize, 1); |
| 342 | 136 } |
| 137 | |
| 138 void set_try_claimed() { _try_claimed = true; } | |
| 139 | |
| 140 void scanCard(size_t index, HeapRegion *r) { | |
| 4023 | 141 // Stack allocate the DirtyCardToOopClosure instance |
| 142 HeapRegionDCTOC cl(_g1h, r, _oc, | |
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143 CardTableModRefBS::Precise); |
| 342 | 144 |
| 145 // Set the "from" region in the closure. | |
| 146 _oc->set_region(r); | |
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147 MemRegion card_region(_bot_shared->address_for_index(index), G1BlockOffsetSharedArray::N_words); |
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148 MemRegion pre_gc_allocated(r->bottom(), r->scan_top()); |
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149 MemRegion mr = pre_gc_allocated.intersection(card_region); |
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150 if (!mr.is_empty() && !_ct_bs->is_card_claimed(index)) { |
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151 // We make the card as "claimed" lazily (so races are possible |
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152 // but they're benign), which reduces the number of duplicate |
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153 // scans (the rsets of the regions in the cset can intersect). |
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154 _ct_bs->set_card_claimed(index); |
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155 _cards_done++; |
| 4023 | 156 cl.do_MemRegion(mr); |
| 342 | 157 } |
| 158 } | |
| 159 | |
| 160 void printCard(HeapRegion* card_region, size_t card_index, | |
| 161 HeapWord* card_start) { | |
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162 gclog_or_tty->print_cr("T " UINT32_FORMAT " Region [" PTR_FORMAT ", " PTR_FORMAT ") " |
| 342 | 163 "RS names card %p: " |
| 164 "[" PTR_FORMAT ", " PTR_FORMAT ")", | |
| 165 _worker_i, | |
| 166 card_region->bottom(), card_region->end(), | |
| 167 card_index, | |
| 168 card_start, card_start + G1BlockOffsetSharedArray::N_words); | |
| 169 } | |
| 170 | |
| 12080 | 171 void scan_strong_code_roots(HeapRegion* r) { |
| 172 double scan_start = os::elapsedTime(); | |
| 173 r->strong_code_roots_do(_code_root_cl); | |
| 174 _strong_code_root_scan_time_sec += (os::elapsedTime() - scan_start); | |
| 175 } | |
| 176 | |
| 342 | 177 bool doHeapRegion(HeapRegion* r) { |
| 178 assert(r->in_collection_set(), "should only be called on elements of CS."); | |
| 179 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 180 if (hrrs->iter_is_complete()) return false; // All done. | |
| 181 if (!_try_claimed && !hrrs->claim_iter()) return false; | |
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182 // If we ever free the collection set concurrently, we should also |
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183 // clear the card table concurrently therefore we won't need to |
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184 // add regions of the collection set to the dirty cards region. |
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185 _g1h->push_dirty_cards_region(r); |
| 342 | 186 // If we didn't return above, then |
| 187 // _try_claimed || r->claim_iter() | |
| 188 // is true: either we're supposed to work on claimed-but-not-complete | |
| 189 // regions, or we successfully claimed the region. | |
| 12080 | 190 |
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191 HeapRegionRemSetIterator iter(hrrs); |
| 342 | 192 size_t card_index; |
| 1261 | 193 |
| 194 // We claim cards in block so as to recude the contention. The block size is determined by | |
| 195 // the G1RSetScanBlockSize parameter. | |
| 196 size_t jump_to_card = hrrs->iter_claimed_next(_block_size); | |
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197 for (size_t current_card = 0; iter.has_next(card_index); current_card++) { |
| 1261 | 198 if (current_card >= jump_to_card + _block_size) { |
| 199 jump_to_card = hrrs->iter_claimed_next(_block_size); | |
| 747 | 200 } |
| 1261 | 201 if (current_card < jump_to_card) continue; |
| 342 | 202 HeapWord* card_start = _g1h->bot_shared()->address_for_index(card_index); |
| 203 #if 0 | |
| 204 gclog_or_tty->print("Rem set iteration yielded card [" PTR_FORMAT ", " PTR_FORMAT ").\n", | |
| 205 card_start, card_start + CardTableModRefBS::card_size_in_words); | |
| 206 #endif | |
| 207 | |
| 208 HeapRegion* card_region = _g1h->heap_region_containing(card_start); | |
| 209 _cards++; | |
| 210 | |
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211 if (!card_region->is_on_dirty_cards_region_list()) { |
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212 _g1h->push_dirty_cards_region(card_region); |
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213 } |
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214 |
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215 // If the card is dirty, then we will scan it during updateRS. |
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216 if (!card_region->in_collection_set() && |
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217 !_ct_bs->is_card_dirty(card_index)) { |
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218 scanCard(card_index, card_region); |
| 342 | 219 } |
| 220 } | |
| 747 | 221 if (!_try_claimed) { |
| 12080 | 222 // Scan the strong code root list attached to the current region |
| 223 scan_strong_code_roots(r); | |
| 224 | |
| 747 | 225 hrrs->set_iter_complete(); |
| 226 } | |
| 342 | 227 return false; |
| 228 } | |
| 12080 | 229 |
| 230 double strong_code_root_scan_time_sec() { | |
| 231 return _strong_code_root_scan_time_sec; | |
| 232 } | |
| 233 | |
| 342 | 234 size_t cards_done() { return _cards_done;} |
| 235 size_t cards_looked_up() { return _cards;} | |
| 236 }; | |
| 237 | |
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238 void G1RemSet::scanRS(G1ParPushHeapRSClosure* oc, |
| 20494 | 239 CodeBlobClosure* code_root_cl, |
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240 uint worker_i) { |
| 342 | 241 double rs_time_start = os::elapsedTime(); |
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242 HeapRegion *startRegion = _g1->start_cset_region_for_worker(worker_i); |
| 342 | 243 |
| 12080 | 244 ScanRSClosure scanRScl(oc, code_root_cl, worker_i); |
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245 |
| 342 | 246 _g1->collection_set_iterate_from(startRegion, &scanRScl); |
| 247 scanRScl.set_try_claimed(); | |
| 248 _g1->collection_set_iterate_from(startRegion, &scanRScl); | |
| 249 | |
| 12080 | 250 double scan_rs_time_sec = (os::elapsedTime() - rs_time_start) |
| 251 - scanRScl.strong_code_root_scan_time_sec(); | |
| 342 | 252 |
| 12080 | 253 assert(_cards_scanned != NULL, "invariant"); |
| 342 | 254 _cards_scanned[worker_i] = scanRScl.cards_done(); |
| 255 | |
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256 _g1p->phase_times()->record_time_secs(G1GCPhaseTimes::ScanRS, worker_i, scan_rs_time_sec); |
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257 _g1p->phase_times()->record_time_secs(G1GCPhaseTimes::CodeRoots, worker_i, scanRScl.strong_code_root_scan_time_sec()); |
| 342 | 258 } |
| 259 | |
| 1705 | 260 // Closure used for updating RSets and recording references that |
| 261 // point into the collection set. Only called during an | |
| 262 // evacuation pause. | |
| 263 | |
| 264 class RefineRecordRefsIntoCSCardTableEntryClosure: public CardTableEntryClosure { | |
| 265 G1RemSet* _g1rs; | |
| 266 DirtyCardQueue* _into_cset_dcq; | |
| 267 public: | |
| 268 RefineRecordRefsIntoCSCardTableEntryClosure(G1CollectedHeap* g1h, | |
| 269 DirtyCardQueue* into_cset_dcq) : | |
| 270 _g1rs(g1h->g1_rem_set()), _into_cset_dcq(into_cset_dcq) | |
| 271 {} | |
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272 bool do_card_ptr(jbyte* card_ptr, uint worker_i) { |
| 1705 | 273 // The only time we care about recording cards that |
| 274 // contain references that point into the collection set | |
| 275 // is during RSet updating within an evacuation pause. | |
| 276 // In this case worker_i should be the id of a GC worker thread. | |
| 277 assert(SafepointSynchronize::is_at_safepoint(), "not during an evacuation pause"); | |
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278 assert(worker_i < (ParallelGCThreads == 0 ? 1 : ParallelGCThreads), "should be a GC worker"); |
| 342 | 279 |
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280 if (_g1rs->refine_card(card_ptr, worker_i, true)) { |
| 1705 | 281 // 'card_ptr' contains references that point into the collection |
| 282 // set. We need to record the card in the DCQS | |
| 283 // (G1CollectedHeap::into_cset_dirty_card_queue_set()) | |
| 284 // that's used for that purpose. | |
| 285 // | |
| 286 // Enqueue the card | |
| 287 _into_cset_dcq->enqueue(card_ptr); | |
| 288 } | |
| 289 return true; | |
| 290 } | |
| 291 }; | |
| 292 | |
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293 void G1RemSet::updateRS(DirtyCardQueue* into_cset_dcq, uint worker_i) { |
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294 G1GCParPhaseTimesTracker x(_g1p->phase_times(), G1GCPhaseTimes::UpdateRS, worker_i); |
| 1705 | 295 // Apply the given closure to all remaining log entries. |
| 296 RefineRecordRefsIntoCSCardTableEntryClosure into_cset_update_rs_cl(_g1, into_cset_dcq); | |
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297 |
| 1705 | 298 _g1->iterate_dirty_card_closure(&into_cset_update_rs_cl, into_cset_dcq, false, worker_i); |
| 342 | 299 } |
| 300 | |
| 1861 | 301 void G1RemSet::cleanupHRRS() { |
| 342 | 302 HeapRegionRemSet::cleanup(); |
| 303 } | |
| 304 | |
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305 void G1RemSet::oops_into_collection_set_do(G1ParPushHeapRSClosure* oc, |
| 20494 | 306 CodeBlobClosure* code_root_cl, |
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307 uint worker_i) { |
| 342 | 308 #if CARD_REPEAT_HISTO |
| 309 ct_freq_update_histo_and_reset(); | |
| 310 #endif | |
| 311 | |
| 1705 | 312 // We cache the value of 'oc' closure into the appropriate slot in the |
| 313 // _cset_rs_update_cl for this worker | |
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314 assert(worker_i < n_workers(), "sanity"); |
| 1705 | 315 _cset_rs_update_cl[worker_i] = oc; |
| 316 | |
| 317 // A DirtyCardQueue that is used to hold cards containing references | |
| 318 // that point into the collection set. This DCQ is associated with a | |
| 319 // special DirtyCardQueueSet (see g1CollectedHeap.hpp). Under normal | |
| 320 // circumstances (i.e. the pause successfully completes), these cards | |
| 321 // are just discarded (there's no need to update the RSets of regions | |
| 322 // that were in the collection set - after the pause these regions | |
| 323 // are wholly 'free' of live objects. In the event of an evacuation | |
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324 // failure the cards/buffers in this queue set are passed to the |
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325 // DirtyCardQueueSet that is used to manage RSet updates |
| 1705 | 326 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); |
| 327 | |
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328 assert((ParallelGCThreads > 0) || worker_i == 0, "invariant"); |
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329 |
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330 updateRS(&into_cset_dcq, worker_i); |
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331 scanRS(oc, code_root_cl, worker_i); |
| 1705 | 332 |
| 333 // We now clear the cached values of _cset_rs_update_cl for this worker | |
| 334 _cset_rs_update_cl[worker_i] = NULL; | |
| 342 | 335 } |
| 336 | |
| 1861 | 337 void G1RemSet::prepare_for_oops_into_collection_set_do() { |
| 342 | 338 cleanupHRRS(); |
| 339 _g1->set_refine_cte_cl_concurrency(false); | |
| 340 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 341 dcqs.concatenate_logs(); | |
| 342 | |
| 343 guarantee( _cards_scanned == NULL, "invariant" ); | |
| 6197 | 344 _cards_scanned = NEW_C_HEAP_ARRAY(size_t, n_workers(), mtGC); |
| 545 | 345 for (uint i = 0; i < n_workers(); ++i) { |
| 346 _cards_scanned[i] = 0; | |
| 347 } | |
| 342 | 348 _total_cards_scanned = 0; |
| 349 } | |
| 350 | |
| 1861 | 351 void G1RemSet::cleanup_after_oops_into_collection_set_do() { |
| 342 | 352 guarantee( _cards_scanned != NULL, "invariant" ); |
| 353 _total_cards_scanned = 0; | |
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354 for (uint i = 0; i < n_workers(); ++i) { |
| 342 | 355 _total_cards_scanned += _cards_scanned[i]; |
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356 } |
| 6197 | 357 FREE_C_HEAP_ARRAY(size_t, _cards_scanned, mtGC); |
| 342 | 358 _cards_scanned = NULL; |
| 359 // Cleanup after copy | |
| 360 _g1->set_refine_cte_cl_concurrency(true); | |
| 361 // Set all cards back to clean. | |
| 362 _g1->cleanUpCardTable(); | |
| 794 | 363 |
| 1705 | 364 DirtyCardQueueSet& into_cset_dcqs = _g1->into_cset_dirty_card_queue_set(); |
| 365 int into_cset_n_buffers = into_cset_dcqs.completed_buffers_num(); | |
| 366 | |
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367 if (_g1->evacuation_failed()) { |
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368 double restore_remembered_set_start = os::elapsedTime(); |
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369 |
| 1705 | 370 // Restore remembered sets for the regions pointing into the collection set. |
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371 // We just need to transfer the completed buffers from the DirtyCardQueueSet |
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372 // used to hold cards that contain references that point into the collection set |
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373 // to the DCQS used to hold the deferred RS updates. |
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374 _g1->dirty_card_queue_set().merge_bufferlists(&into_cset_dcqs); |
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375 _g1->g1_policy()->phase_times()->record_evac_fail_restore_remsets((os::elapsedTime() - restore_remembered_set_start) * 1000.0); |
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376 } |
| 1705 | 377 |
| 378 // Free any completed buffers in the DirtyCardQueueSet used to hold cards | |
| 379 // which contain references that point into the collection. | |
| 380 _g1->into_cset_dirty_card_queue_set().clear(); | |
| 381 assert(_g1->into_cset_dirty_card_queue_set().completed_buffers_num() == 0, | |
| 382 "all buffers should be freed"); | |
| 383 _g1->into_cset_dirty_card_queue_set().clear_n_completed_buffers(); | |
| 342 | 384 } |
| 385 | |
| 386 class ScrubRSClosure: public HeapRegionClosure { | |
| 387 G1CollectedHeap* _g1h; | |
| 388 BitMap* _region_bm; | |
| 389 BitMap* _card_bm; | |
| 390 CardTableModRefBS* _ctbs; | |
| 391 public: | |
| 392 ScrubRSClosure(BitMap* region_bm, BitMap* card_bm) : | |
| 393 _g1h(G1CollectedHeap::heap()), | |
| 394 _region_bm(region_bm), _card_bm(card_bm), | |
| 12343 | 395 _ctbs(_g1h->g1_barrier_set()) {} |
| 342 | 396 |
| 397 bool doHeapRegion(HeapRegion* r) { | |
| 398 if (!r->continuesHumongous()) { | |
| 399 r->rem_set()->scrub(_ctbs, _region_bm, _card_bm); | |
| 400 } | |
| 401 return false; | |
| 402 } | |
| 403 }; | |
| 404 | |
| 1861 | 405 void G1RemSet::scrub(BitMap* region_bm, BitMap* card_bm) { |
| 342 | 406 ScrubRSClosure scrub_cl(region_bm, card_bm); |
| 407 _g1->heap_region_iterate(&scrub_cl); | |
| 408 } | |
| 409 | |
| 1861 | 410 void G1RemSet::scrub_par(BitMap* region_bm, BitMap* card_bm, |
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411 uint worker_num, int claim_val) { |
| 342 | 412 ScrubRSClosure scrub_cl(region_bm, card_bm); |
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413 _g1->heap_region_par_iterate_chunked(&scrub_cl, |
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414 worker_num, |
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415 n_workers(), |
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416 claim_val); |
| 342 | 417 } |
| 418 | |
| 4839 | 419 G1TriggerClosure::G1TriggerClosure() : |
| 420 _triggered(false) { } | |
| 421 | |
| 422 G1InvokeIfNotTriggeredClosure::G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t_cl, | |
| 423 OopClosure* oop_cl) : | |
| 424 _trigger_cl(t_cl), _oop_cl(oop_cl) { } | |
| 1705 | 425 |
| 4839 | 426 G1Mux2Closure::G1Mux2Closure(OopClosure *c1, OopClosure *c2) : |
| 427 _c1(c1), _c2(c2) { } | |
| 1705 | 428 |
| 4839 | 429 G1UpdateRSOrPushRefOopClosure:: |
| 430 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h, | |
| 431 G1RemSet* rs, | |
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432 G1ParPushHeapRSClosure* push_ref_cl, |
| 4839 | 433 bool record_refs_into_cset, |
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434 uint worker_i) : |
| 4839 | 435 _g1(g1h), _g1_rem_set(rs), _from(NULL), |
| 436 _record_refs_into_cset(record_refs_into_cset), | |
| 437 _push_ref_cl(push_ref_cl), _worker_i(worker_i) { } | |
| 1705 | 438 |
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439 // Returns true if the given card contains references that point |
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440 // into the collection set, if we're checking for such references; |
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441 // false otherwise. |
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442 |
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443 bool G1RemSet::refine_card(jbyte* card_ptr, uint worker_i, |
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444 bool check_for_refs_into_cset) { |
| 20337 | 445 assert(_g1->is_in_exact(_ct_bs->addr_for(card_ptr)), |
| 446 err_msg("Card at "PTR_FORMAT" index "SIZE_FORMAT" representing heap at "PTR_FORMAT" (%u) must be in committed heap", | |
| 447 p2i(card_ptr), | |
| 448 _ct_bs->index_for(_ct_bs->addr_for(card_ptr)), | |
| 449 _ct_bs->addr_for(card_ptr), | |
| 450 _g1->addr_to_region(_ct_bs->addr_for(card_ptr)))); | |
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451 |
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452 // If the card is no longer dirty, nothing to do. |
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453 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
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454 // No need to return that this card contains refs that point |
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455 // into the collection set. |
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456 return false; |
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457 } |
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458 |
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459 // Construct the region representing the card. |
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460 HeapWord* start = _ct_bs->addr_for(card_ptr); |
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461 // And find the region containing it. |
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462 HeapRegion* r = _g1->heap_region_containing(start); |
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463 |
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464 // Why do we have to check here whether a card is on a young region, |
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465 // given that we dirty young regions and, as a result, the |
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466 // post-barrier is supposed to filter them out and never to enqueue |
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467 // them? When we allocate a new region as the "allocation region" we |
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468 // actually dirty its cards after we release the lock, since card |
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469 // dirtying while holding the lock was a performance bottleneck. So, |
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470 // as a result, it is possible for other threads to actually |
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471 // allocate objects in the region (after the acquire the lock) |
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472 // before all the cards on the region are dirtied. This is unlikely, |
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473 // and it doesn't happen often, but it can happen. So, the extra |
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474 // check below filters out those cards. |
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475 if (r->is_young()) { |
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476 return false; |
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477 } |
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478 |
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479 // While we are processing RSet buffers during the collection, we |
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480 // actually don't want to scan any cards on the collection set, |
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481 // since we don't want to update remebered sets with entries that |
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482 // point into the collection set, given that live objects from the |
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483 // collection set are about to move and such entries will be stale |
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484 // very soon. This change also deals with a reliability issue which |
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485 // involves scanning a card in the collection set and coming across |
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486 // an array that was being chunked and looking malformed. Note, |
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487 // however, that if evacuation fails, we have to scan any objects |
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488 // that were not moved and create any missing entries. |
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489 if (r->in_collection_set()) { |
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490 return false; |
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491 } |
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492 |
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493 // The result from the hot card cache insert call is either: |
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494 // * pointer to the current card |
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495 // (implying that the current card is not 'hot'), |
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496 // * null |
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497 // (meaning we had inserted the card ptr into the "hot" card cache, |
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498 // which had some headroom), |
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499 // * a pointer to a "hot" card that was evicted from the "hot" cache. |
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500 // |
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501 |
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502 G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
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503 if (hot_card_cache->use_cache()) { |
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504 assert(!check_for_refs_into_cset, "sanity"); |
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505 assert(!SafepointSynchronize::is_at_safepoint(), "sanity"); |
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506 |
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507 card_ptr = hot_card_cache->insert(card_ptr); |
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508 if (card_ptr == NULL) { |
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509 // There was no eviction. Nothing to do. |
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510 return false; |
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511 } |
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512 |
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513 start = _ct_bs->addr_for(card_ptr); |
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514 r = _g1->heap_region_containing(start); |
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515 |
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516 // Checking whether the region we got back from the cache |
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517 // is young here is inappropriate. The region could have been |
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518 // freed, reallocated and tagged as young while in the cache. |
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519 // Hence we could see its young type change at any time. |
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520 } |
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521 |
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522 // Don't use addr_for(card_ptr + 1) which can ask for |
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523 // a card beyond the heap. This is not safe without a perm |
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524 // gen at the upper end of the heap. |
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525 HeapWord* end = start + CardTableModRefBS::card_size_in_words; |
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526 MemRegion dirtyRegion(start, end); |
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527 |
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528 #if CARD_REPEAT_HISTO |
|
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529 init_ct_freq_table(_g1->max_capacity()); |
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530 ct_freq_note_card(_ct_bs->index_for(start)); |
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531 #endif |
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532 |
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533 G1ParPushHeapRSClosure* oops_in_heap_closure = NULL; |
|
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534 if (check_for_refs_into_cset) { |
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535 // ConcurrentG1RefineThreads have worker numbers larger than what |
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536 // _cset_rs_update_cl[] is set up to handle. But those threads should |
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537 // only be active outside of a collection which means that when they |
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538 // reach here they should have check_for_refs_into_cset == false. |
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539 assert((size_t)worker_i < n_workers(), "index of worker larger than _cset_rs_update_cl[].length"); |
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540 oops_in_heap_closure = _cset_rs_update_cl[worker_i]; |
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541 } |
| 4839 | 542 G1UpdateRSOrPushRefOopClosure update_rs_oop_cl(_g1, |
| 543 _g1->g1_rem_set(), | |
| 544 oops_in_heap_closure, | |
| 545 check_for_refs_into_cset, | |
| 546 worker_i); | |
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547 update_rs_oop_cl.set_from(r); |
| 1705 | 548 |
| 4839 | 549 G1TriggerClosure trigger_cl; |
|
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550 FilterIntoCSClosure into_cs_cl(NULL, _g1, &trigger_cl); |
| 4839 | 551 G1InvokeIfNotTriggeredClosure invoke_cl(&trigger_cl, &into_cs_cl); |
| 552 G1Mux2Closure mux(&invoke_cl, &update_rs_oop_cl); | |
| 1705 | 553 |
| 554 FilterOutOfRegionClosure filter_then_update_rs_oop_cl(r, | |
| 555 (check_for_refs_into_cset ? | |
| 556 (OopClosure*)&mux : | |
| 557 (OopClosure*)&update_rs_oop_cl)); | |
|
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558 |
|
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559 // The region for the current card may be a young region. The |
|
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560 // current card may have been a card that was evicted from the |
|
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561 // card cache. When the card was inserted into the cache, we had |
|
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562 // determined that its region was non-young. While in the cache, |
|
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563 // the region may have been freed during a cleanup pause, reallocated |
|
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564 // and tagged as young. |
|
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565 // |
|
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|
566 // We wish to filter out cards for such a region but the current |
|
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567 // thread, if we're running concurrently, may "see" the young type |
|
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568 // change at any time (so an earlier "is_young" check may pass or |
|
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|
569 // fail arbitrarily). We tell the iteration code to perform this |
|
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|
570 // filtering when it has been determined that there has been an actual |
|
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571 // allocation in this region and making it safe to check the young type. |
|
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|
572 bool filter_young = true; |
|
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573 |
|
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|
574 HeapWord* stop_point = |
|
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575 r->oops_on_card_seq_iterate_careful(dirtyRegion, |
|
1666
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576 &filter_then_update_rs_oop_cl, |
|
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|
577 filter_young, |
|
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|
578 card_ptr); |
|
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579 |
|
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|
580 // If stop_point is non-null, then we encountered an unallocated region |
|
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581 // (perhaps the unfilled portion of a TLAB.) For now, we'll dirty the |
|
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582 // card and re-enqueue: if we put off the card until a GC pause, then the |
|
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|
583 // unallocated portion will be filled in. Alternatively, we might try |
|
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584 // the full complexity of the technique used in "regular" precleaning. |
|
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|
585 if (stop_point != NULL) { |
|
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586 // The card might have gotten re-dirtied and re-enqueued while we |
|
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|
587 // worked. (In fact, it's pretty likely.) |
|
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|
588 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
|
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|
589 *card_ptr = CardTableModRefBS::dirty_card_val(); |
|
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|
590 MutexLockerEx x(Shared_DirtyCardQ_lock, |
|
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591 Mutex::_no_safepoint_check_flag); |
|
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|
592 DirtyCardQueue* sdcq = |
|
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|
593 JavaThread::dirty_card_queue_set().shared_dirty_card_queue(); |
|
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|
594 sdcq->enqueue(card_ptr); |
|
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595 } |
|
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|
596 } else { |
|
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|
597 _conc_refine_cards++; |
|
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|
598 } |
| 1705 | 599 |
|
10246
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|
600 // This gets set to true if the card being refined has |
|
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|
601 // references that point into the collection set. |
|
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|
602 bool has_refs_into_cset = trigger_cl.triggered(); |
| 342 | 603 |
|
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|
604 // We should only be detecting that the card contains references |
|
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|
605 // that point into the collection set if the current thread is |
|
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606 // a GC worker thread. |
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607 assert(!has_refs_into_cset || SafepointSynchronize::is_at_safepoint(), |
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608 "invalid result at non safepoint"); |
| 1705 | 609 |
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610 return has_refs_into_cset; |
| 342 | 611 } |
| 612 | |
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613 void G1RemSet::print_periodic_summary_info(const char* header) { |
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614 G1RemSetSummary current; |
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615 current.initialize(this); |
| 342 | 616 |
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617 _prev_period_summary.subtract_from(¤t); |
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618 print_summary_info(&_prev_period_summary, header); |
| 342 | 619 |
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620 _prev_period_summary.set(¤t); |
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621 } |
| 794 | 622 |
| 1861 | 623 void G1RemSet::print_summary_info() { |
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624 G1RemSetSummary current; |
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625 current.initialize(this); |
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626 |
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627 print_summary_info(¤t, " Cumulative RS summary"); |
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628 } |
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629 |
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630 void G1RemSet::print_summary_info(G1RemSetSummary * summary, const char * header) { |
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631 assert(summary != NULL, "just checking"); |
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632 |
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633 if (header != NULL) { |
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634 gclog_or_tty->print_cr("%s", header); |
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635 } |
| 342 | 636 |
| 637 #if CARD_REPEAT_HISTO | |
| 638 gclog_or_tty->print_cr("\nG1 card_repeat count histogram: "); | |
| 639 gclog_or_tty->print_cr(" # of repeats --> # of cards with that number."); | |
| 640 card_repeat_count.print_on(gclog_or_tty); | |
| 641 #endif | |
| 642 | |
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643 summary->print_on(gclog_or_tty); |
| 342 | 644 } |
| 1705 | 645 |
| 1861 | 646 void G1RemSet::prepare_for_verify() { |
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647 if (G1HRRSFlushLogBuffersOnVerify && |
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648 (VerifyBeforeGC || VerifyAfterGC) |
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649 && (!_g1->full_collection() || G1VerifyRSetsDuringFullGC)) { |
| 342 | 650 cleanupHRRS(); |
| 651 _g1->set_refine_cte_cl_concurrency(false); | |
| 652 if (SafepointSynchronize::is_at_safepoint()) { | |
| 653 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 654 dcqs.concatenate_logs(); | |
| 655 } | |
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656 |
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657 G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
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658 bool use_hot_card_cache = hot_card_cache->use_cache(); |
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659 hot_card_cache->set_use_cache(false); |
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660 |
| 1705 | 661 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); |
| 662 updateRS(&into_cset_dcq, 0); | |
| 663 _g1->into_cset_dirty_card_queue_set().clear(); | |
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664 |
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665 hot_card_cache->set_use_cache(use_hot_card_cache); |
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666 assert(JavaThread::dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
| 342 | 667 } |
| 668 } |