Thu, 21 Aug 2014 16:44:41 +0200
8055098: WB API should be extended to provide information about size and age of object.
Summary: Extend the WhiteBox API to provide information about the size and age of objects. Further add a mechanism to trigger a young GC.
Reviewed-by: tschatzl, sjohanss
Contributed-by: Leonid Mesnik <leonid.mesnik@oracle.com>
ysr@777 | 1 | /* |
drchase@6680 | 2 | * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
ysr@777 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
ysr@777 | 4 | * |
ysr@777 | 5 | * This code is free software; you can redistribute it and/or modify it |
ysr@777 | 6 | * under the terms of the GNU General Public License version 2 only, as |
ysr@777 | 7 | * published by the Free Software Foundation. |
ysr@777 | 8 | * |
ysr@777 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
ysr@777 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
ysr@777 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
ysr@777 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
ysr@777 | 13 | * accompanied this code). |
ysr@777 | 14 | * |
ysr@777 | 15 | * You should have received a copy of the GNU General Public License version |
ysr@777 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
ysr@777 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
ysr@777 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
ysr@777 | 22 | * |
ysr@777 | 23 | */ |
ysr@777 | 24 | |
stefank@2314 | 25 | #include "precompiled.hpp" |
stefank@2314 | 26 | #include "gc_implementation/g1/concurrentG1Refine.hpp" |
stefank@2314 | 27 | #include "gc_implementation/g1/concurrentG1RefineThread.hpp" |
stefank@2314 | 28 | #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" |
stefank@2314 | 29 | #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
stefank@2314 | 30 | #include "gc_implementation/g1/g1CollectorPolicy.hpp" |
johnc@5078 | 31 | #include "gc_implementation/g1/g1HotCardCache.hpp" |
brutisso@3923 | 32 | #include "gc_implementation/g1/g1GCPhaseTimes.hpp" |
stefank@2314 | 33 | #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
stefank@2314 | 34 | #include "gc_implementation/g1/g1RemSet.inline.hpp" |
stefank@2314 | 35 | #include "gc_implementation/g1/heapRegionSeq.inline.hpp" |
tschatzl@5204 | 36 | #include "gc_implementation/g1/heapRegionRemSet.hpp" |
stefank@2314 | 37 | #include "memory/iterator.hpp" |
stefank@2314 | 38 | #include "oops/oop.inline.hpp" |
stefank@2314 | 39 | #include "utilities/intHisto.hpp" |
ysr@777 | 40 | |
drchase@6680 | 41 | PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
drchase@6680 | 42 | |
ysr@777 | 43 | #define CARD_REPEAT_HISTO 0 |
ysr@777 | 44 | |
ysr@777 | 45 | #if CARD_REPEAT_HISTO |
ysr@777 | 46 | static size_t ct_freq_sz; |
ysr@777 | 47 | static jbyte* ct_freq = NULL; |
ysr@777 | 48 | |
ysr@777 | 49 | void init_ct_freq_table(size_t heap_sz_bytes) { |
ysr@777 | 50 | if (ct_freq == NULL) { |
ysr@777 | 51 | ct_freq_sz = heap_sz_bytes/CardTableModRefBS::card_size; |
ysr@777 | 52 | ct_freq = new jbyte[ct_freq_sz]; |
ysr@777 | 53 | for (size_t j = 0; j < ct_freq_sz; j++) ct_freq[j] = 0; |
ysr@777 | 54 | } |
ysr@777 | 55 | } |
ysr@777 | 56 | |
ysr@777 | 57 | void ct_freq_note_card(size_t index) { |
ysr@777 | 58 | assert(0 <= index && index < ct_freq_sz, "Bounds error."); |
ysr@777 | 59 | if (ct_freq[index] < 100) { ct_freq[index]++; } |
ysr@777 | 60 | } |
ysr@777 | 61 | |
ysr@777 | 62 | static IntHistogram card_repeat_count(10, 10); |
ysr@777 | 63 | |
ysr@777 | 64 | void ct_freq_update_histo_and_reset() { |
ysr@777 | 65 | for (size_t j = 0; j < ct_freq_sz; j++) { |
ysr@777 | 66 | card_repeat_count.add_entry(ct_freq[j]); |
ysr@777 | 67 | ct_freq[j] = 0; |
ysr@777 | 68 | } |
ysr@777 | 69 | |
ysr@777 | 70 | } |
ysr@777 | 71 | #endif |
ysr@777 | 72 | |
johnc@2216 | 73 | G1RemSet::G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs) |
johnc@2216 | 74 | : _g1(g1), _conc_refine_cards(0), |
johnc@2216 | 75 | _ct_bs(ct_bs), _g1p(_g1->g1_policy()), |
ysr@777 | 76 | _cg1r(g1->concurrent_g1_refine()), |
johnc@2060 | 77 | _cset_rs_update_cl(NULL), |
tschatzl@5204 | 78 | _cards_scanned(NULL), _total_cards_scanned(0), |
tschatzl@5204 | 79 | _prev_period_summary() |
ysr@777 | 80 | { |
ysr@777 | 81 | _seq_task = new SubTasksDone(NumSeqTasks); |
iveresov@1051 | 82 | guarantee(n_workers() > 0, "There should be some workers"); |
zgu@3900 | 83 | _cset_rs_update_cl = NEW_C_HEAP_ARRAY(OopsInHeapRegionClosure*, n_workers(), mtGC); |
iveresov@1051 | 84 | for (uint i = 0; i < n_workers(); i++) { |
johnc@2060 | 85 | _cset_rs_update_cl[i] = NULL; |
iveresov@1051 | 86 | } |
tschatzl@5812 | 87 | if (G1SummarizeRSetStats) { |
tschatzl@5812 | 88 | _prev_period_summary.initialize(this); |
tschatzl@5812 | 89 | } |
ysr@777 | 90 | } |
ysr@777 | 91 | |
johnc@2216 | 92 | G1RemSet::~G1RemSet() { |
ysr@777 | 93 | delete _seq_task; |
iveresov@1051 | 94 | for (uint i = 0; i < n_workers(); i++) { |
johnc@2060 | 95 | assert(_cset_rs_update_cl[i] == NULL, "it should be"); |
iveresov@1051 | 96 | } |
zgu@3900 | 97 | FREE_C_HEAP_ARRAY(OopsInHeapRegionClosure*, _cset_rs_update_cl, mtGC); |
ysr@777 | 98 | } |
ysr@777 | 99 | |
ysr@777 | 100 | void CountNonCleanMemRegionClosure::do_MemRegion(MemRegion mr) { |
ysr@777 | 101 | if (_g1->is_in_g1_reserved(mr.start())) { |
ysr@777 | 102 | _n += (int) ((mr.byte_size() / CardTableModRefBS::card_size)); |
ysr@777 | 103 | if (_start_first == NULL) _start_first = mr.start(); |
ysr@777 | 104 | } |
ysr@777 | 105 | } |
ysr@777 | 106 | |
ysr@777 | 107 | class ScanRSClosure : public HeapRegionClosure { |
ysr@777 | 108 | size_t _cards_done, _cards; |
ysr@777 | 109 | G1CollectedHeap* _g1h; |
johnc@5548 | 110 | |
ysr@777 | 111 | OopsInHeapRegionClosure* _oc; |
johnc@5548 | 112 | CodeBlobToOopClosure* _code_root_cl; |
johnc@5548 | 113 | |
ysr@777 | 114 | G1BlockOffsetSharedArray* _bot_shared; |
mgerdin@5811 | 115 | G1SATBCardTableModRefBS *_ct_bs; |
johnc@5548 | 116 | |
johnc@5548 | 117 | double _strong_code_root_scan_time_sec; |
vkempik@6552 | 118 | uint _worker_i; |
johnc@5548 | 119 | int _block_size; |
johnc@5548 | 120 | bool _try_claimed; |
johnc@5548 | 121 | |
ysr@777 | 122 | public: |
johnc@5548 | 123 | ScanRSClosure(OopsInHeapRegionClosure* oc, |
johnc@5548 | 124 | CodeBlobToOopClosure* code_root_cl, |
vkempik@6552 | 125 | uint worker_i) : |
ysr@777 | 126 | _oc(oc), |
johnc@5548 | 127 | _code_root_cl(code_root_cl), |
johnc@5548 | 128 | _strong_code_root_scan_time_sec(0.0), |
ysr@777 | 129 | _cards(0), |
ysr@777 | 130 | _cards_done(0), |
ysr@777 | 131 | _worker_i(worker_i), |
ysr@777 | 132 | _try_claimed(false) |
ysr@777 | 133 | { |
ysr@777 | 134 | _g1h = G1CollectedHeap::heap(); |
ysr@777 | 135 | _bot_shared = _g1h->bot_shared(); |
mgerdin@5811 | 136 | _ct_bs = _g1h->g1_barrier_set(); |
iveresov@1696 | 137 | _block_size = MAX2<int>(G1RSetScanBlockSize, 1); |
ysr@777 | 138 | } |
ysr@777 | 139 | |
ysr@777 | 140 | void set_try_claimed() { _try_claimed = true; } |
ysr@777 | 141 | |
ysr@777 | 142 | void scanCard(size_t index, HeapRegion *r) { |
johnc@3219 | 143 | // Stack allocate the DirtyCardToOopClosure instance |
johnc@3219 | 144 | HeapRegionDCTOC cl(_g1h, r, _oc, |
johnc@3219 | 145 | CardTableModRefBS::Precise, |
johnc@3219 | 146 | HeapRegionDCTOC::IntoCSFilterKind); |
ysr@777 | 147 | |
ysr@777 | 148 | // Set the "from" region in the closure. |
ysr@777 | 149 | _oc->set_region(r); |
ysr@777 | 150 | HeapWord* card_start = _bot_shared->address_for_index(index); |
ysr@777 | 151 | HeapWord* card_end = card_start + G1BlockOffsetSharedArray::N_words; |
ysr@777 | 152 | Space *sp = SharedHeap::heap()->space_containing(card_start); |
tonyp@2849 | 153 | MemRegion sm_region = sp->used_region_at_save_marks(); |
ysr@777 | 154 | MemRegion mr = sm_region.intersection(MemRegion(card_start,card_end)); |
tonyp@2849 | 155 | if (!mr.is_empty() && !_ct_bs->is_card_claimed(index)) { |
tonyp@2849 | 156 | // We make the card as "claimed" lazily (so races are possible |
tonyp@2849 | 157 | // but they're benign), which reduces the number of duplicate |
tonyp@2849 | 158 | // scans (the rsets of the regions in the cset can intersect). |
tonyp@2849 | 159 | _ct_bs->set_card_claimed(index); |
tonyp@2849 | 160 | _cards_done++; |
johnc@3219 | 161 | cl.do_MemRegion(mr); |
ysr@777 | 162 | } |
ysr@777 | 163 | } |
ysr@777 | 164 | |
ysr@777 | 165 | void printCard(HeapRegion* card_region, size_t card_index, |
ysr@777 | 166 | HeapWord* card_start) { |
vkempik@6552 | 167 | gclog_or_tty->print_cr("T " UINT32_FORMAT " Region [" PTR_FORMAT ", " PTR_FORMAT ") " |
ysr@777 | 168 | "RS names card %p: " |
ysr@777 | 169 | "[" PTR_FORMAT ", " PTR_FORMAT ")", |
ysr@777 | 170 | _worker_i, |
ysr@777 | 171 | card_region->bottom(), card_region->end(), |
ysr@777 | 172 | card_index, |
ysr@777 | 173 | card_start, card_start + G1BlockOffsetSharedArray::N_words); |
ysr@777 | 174 | } |
ysr@777 | 175 | |
johnc@5548 | 176 | void scan_strong_code_roots(HeapRegion* r) { |
johnc@5548 | 177 | double scan_start = os::elapsedTime(); |
johnc@5548 | 178 | r->strong_code_roots_do(_code_root_cl); |
johnc@5548 | 179 | _strong_code_root_scan_time_sec += (os::elapsedTime() - scan_start); |
johnc@5548 | 180 | } |
johnc@5548 | 181 | |
ysr@777 | 182 | bool doHeapRegion(HeapRegion* r) { |
ysr@777 | 183 | assert(r->in_collection_set(), "should only be called on elements of CS."); |
ysr@777 | 184 | HeapRegionRemSet* hrrs = r->rem_set(); |
ysr@777 | 185 | if (hrrs->iter_is_complete()) return false; // All done. |
ysr@777 | 186 | if (!_try_claimed && !hrrs->claim_iter()) return false; |
tonyp@2849 | 187 | // If we ever free the collection set concurrently, we should also |
tonyp@2849 | 188 | // clear the card table concurrently therefore we won't need to |
tonyp@2849 | 189 | // add regions of the collection set to the dirty cards region. |
apetrusenko@1231 | 190 | _g1h->push_dirty_cards_region(r); |
ysr@777 | 191 | // If we didn't return above, then |
ysr@777 | 192 | // _try_claimed || r->claim_iter() |
ysr@777 | 193 | // is true: either we're supposed to work on claimed-but-not-complete |
ysr@777 | 194 | // regions, or we successfully claimed the region. |
johnc@5548 | 195 | |
johnc@5014 | 196 | HeapRegionRemSetIterator iter(hrrs); |
ysr@777 | 197 | size_t card_index; |
iveresov@1696 | 198 | |
iveresov@1696 | 199 | // We claim cards in block so as to recude the contention. The block size is determined by |
iveresov@1696 | 200 | // the G1RSetScanBlockSize parameter. |
iveresov@1696 | 201 | size_t jump_to_card = hrrs->iter_claimed_next(_block_size); |
johnc@5014 | 202 | for (size_t current_card = 0; iter.has_next(card_index); current_card++) { |
iveresov@1696 | 203 | if (current_card >= jump_to_card + _block_size) { |
iveresov@1696 | 204 | jump_to_card = hrrs->iter_claimed_next(_block_size); |
iveresov@1182 | 205 | } |
iveresov@1696 | 206 | if (current_card < jump_to_card) continue; |
ysr@777 | 207 | HeapWord* card_start = _g1h->bot_shared()->address_for_index(card_index); |
ysr@777 | 208 | #if 0 |
ysr@777 | 209 | gclog_or_tty->print("Rem set iteration yielded card [" PTR_FORMAT ", " PTR_FORMAT ").\n", |
ysr@777 | 210 | card_start, card_start + CardTableModRefBS::card_size_in_words); |
ysr@777 | 211 | #endif |
ysr@777 | 212 | |
ysr@777 | 213 | HeapRegion* card_region = _g1h->heap_region_containing(card_start); |
ysr@777 | 214 | _cards++; |
ysr@777 | 215 | |
apetrusenko@1231 | 216 | if (!card_region->is_on_dirty_cards_region_list()) { |
apetrusenko@1231 | 217 | _g1h->push_dirty_cards_region(card_region); |
apetrusenko@1231 | 218 | } |
apetrusenko@1231 | 219 | |
tonyp@2849 | 220 | // If the card is dirty, then we will scan it during updateRS. |
tonyp@2849 | 221 | if (!card_region->in_collection_set() && |
tonyp@2849 | 222 | !_ct_bs->is_card_dirty(card_index)) { |
tonyp@2849 | 223 | scanCard(card_index, card_region); |
ysr@777 | 224 | } |
ysr@777 | 225 | } |
iveresov@1182 | 226 | if (!_try_claimed) { |
johnc@5548 | 227 | // Scan the strong code root list attached to the current region |
johnc@5548 | 228 | scan_strong_code_roots(r); |
johnc@5548 | 229 | |
iveresov@1182 | 230 | hrrs->set_iter_complete(); |
iveresov@1182 | 231 | } |
ysr@777 | 232 | return false; |
ysr@777 | 233 | } |
johnc@5548 | 234 | |
johnc@5548 | 235 | double strong_code_root_scan_time_sec() { |
johnc@5548 | 236 | return _strong_code_root_scan_time_sec; |
johnc@5548 | 237 | } |
johnc@5548 | 238 | |
ysr@777 | 239 | size_t cards_done() { return _cards_done;} |
ysr@777 | 240 | size_t cards_looked_up() { return _cards;} |
ysr@777 | 241 | }; |
ysr@777 | 242 | |
johnc@5548 | 243 | void G1RemSet::scanRS(OopsInHeapRegionClosure* oc, |
johnc@5548 | 244 | CodeBlobToOopClosure* code_root_cl, |
vkempik@6552 | 245 | uint worker_i) { |
ysr@777 | 246 | double rs_time_start = os::elapsedTime(); |
johnc@3296 | 247 | HeapRegion *startRegion = _g1->start_cset_region_for_worker(worker_i); |
ysr@777 | 248 | |
johnc@5548 | 249 | ScanRSClosure scanRScl(oc, code_root_cl, worker_i); |
johnc@3175 | 250 | |
ysr@777 | 251 | _g1->collection_set_iterate_from(startRegion, &scanRScl); |
ysr@777 | 252 | scanRScl.set_try_claimed(); |
ysr@777 | 253 | _g1->collection_set_iterate_from(startRegion, &scanRScl); |
ysr@777 | 254 | |
johnc@5548 | 255 | double scan_rs_time_sec = (os::elapsedTime() - rs_time_start) |
johnc@5548 | 256 | - scanRScl.strong_code_root_scan_time_sec(); |
ysr@777 | 257 | |
johnc@5548 | 258 | assert(_cards_scanned != NULL, "invariant"); |
ysr@777 | 259 | _cards_scanned[worker_i] = scanRScl.cards_done(); |
ysr@777 | 260 | |
brutisso@3923 | 261 | _g1p->phase_times()->record_scan_rs_time(worker_i, scan_rs_time_sec * 1000.0); |
johnc@5548 | 262 | _g1p->phase_times()->record_strong_code_root_scan_time(worker_i, |
johnc@5548 | 263 | scanRScl.strong_code_root_scan_time_sec() * 1000.0); |
ysr@777 | 264 | } |
ysr@777 | 265 | |
johnc@2060 | 266 | // Closure used for updating RSets and recording references that |
johnc@2060 | 267 | // point into the collection set. Only called during an |
johnc@2060 | 268 | // evacuation pause. |
ysr@777 | 269 | |
johnc@2060 | 270 | class RefineRecordRefsIntoCSCardTableEntryClosure: public CardTableEntryClosure { |
johnc@2060 | 271 | G1RemSet* _g1rs; |
johnc@2060 | 272 | DirtyCardQueue* _into_cset_dcq; |
johnc@2060 | 273 | public: |
johnc@2060 | 274 | RefineRecordRefsIntoCSCardTableEntryClosure(G1CollectedHeap* g1h, |
johnc@2060 | 275 | DirtyCardQueue* into_cset_dcq) : |
johnc@2060 | 276 | _g1rs(g1h->g1_rem_set()), _into_cset_dcq(into_cset_dcq) |
johnc@2060 | 277 | {} |
vkempik@6552 | 278 | bool do_card_ptr(jbyte* card_ptr, uint worker_i) { |
johnc@2060 | 279 | // The only time we care about recording cards that |
johnc@2060 | 280 | // contain references that point into the collection set |
johnc@2060 | 281 | // is during RSet updating within an evacuation pause. |
johnc@2060 | 282 | // In this case worker_i should be the id of a GC worker thread. |
johnc@2060 | 283 | assert(SafepointSynchronize::is_at_safepoint(), "not during an evacuation pause"); |
vkempik@6552 | 284 | assert(worker_i < (ParallelGCThreads == 0 ? 1 : ParallelGCThreads), "should be a GC worker"); |
johnc@2060 | 285 | |
johnc@5078 | 286 | if (_g1rs->refine_card(card_ptr, worker_i, true)) { |
johnc@2060 | 287 | // 'card_ptr' contains references that point into the collection |
johnc@2060 | 288 | // set. We need to record the card in the DCQS |
johnc@2060 | 289 | // (G1CollectedHeap::into_cset_dirty_card_queue_set()) |
johnc@2060 | 290 | // that's used for that purpose. |
johnc@2060 | 291 | // |
johnc@2060 | 292 | // Enqueue the card |
johnc@2060 | 293 | _into_cset_dcq->enqueue(card_ptr); |
johnc@2060 | 294 | } |
johnc@2060 | 295 | return true; |
johnc@2060 | 296 | } |
johnc@2060 | 297 | }; |
johnc@2060 | 298 | |
vkempik@6552 | 299 | void G1RemSet::updateRS(DirtyCardQueue* into_cset_dcq, uint worker_i) { |
ysr@777 | 300 | double start = os::elapsedTime(); |
johnc@2060 | 301 | // Apply the given closure to all remaining log entries. |
johnc@2060 | 302 | RefineRecordRefsIntoCSCardTableEntryClosure into_cset_update_rs_cl(_g1, into_cset_dcq); |
johnc@3175 | 303 | |
johnc@2060 | 304 | _g1->iterate_dirty_card_closure(&into_cset_update_rs_cl, into_cset_dcq, false, worker_i); |
johnc@2060 | 305 | |
iveresov@1229 | 306 | // Now there should be no dirty cards. |
iveresov@1229 | 307 | if (G1RSLogCheckCardTable) { |
iveresov@1229 | 308 | CountNonCleanMemRegionClosure cl(_g1); |
iveresov@1229 | 309 | _ct_bs->mod_card_iterate(&cl); |
iveresov@1229 | 310 | // XXX This isn't true any more: keeping cards of young regions |
iveresov@1229 | 311 | // marked dirty broke it. Need some reasonable fix. |
iveresov@1229 | 312 | guarantee(cl.n() == 0, "Card table should be clean."); |
ysr@777 | 313 | } |
iveresov@1229 | 314 | |
brutisso@3923 | 315 | _g1p->phase_times()->record_update_rs_time(worker_i, (os::elapsedTime() - start) * 1000.0); |
ysr@777 | 316 | } |
ysr@777 | 317 | |
johnc@2216 | 318 | void G1RemSet::cleanupHRRS() { |
ysr@777 | 319 | HeapRegionRemSet::cleanup(); |
ysr@777 | 320 | } |
ysr@777 | 321 | |
johnc@2216 | 322 | void G1RemSet::oops_into_collection_set_do(OopsInHeapRegionClosure* oc, |
johnc@5548 | 323 | CodeBlobToOopClosure* code_root_cl, |
vkempik@6552 | 324 | uint worker_i) { |
ysr@777 | 325 | #if CARD_REPEAT_HISTO |
ysr@777 | 326 | ct_freq_update_histo_and_reset(); |
ysr@777 | 327 | #endif |
ysr@777 | 328 | |
johnc@2060 | 329 | // We cache the value of 'oc' closure into the appropriate slot in the |
johnc@2060 | 330 | // _cset_rs_update_cl for this worker |
vkempik@6552 | 331 | assert(worker_i < n_workers(), "sanity"); |
johnc@2060 | 332 | _cset_rs_update_cl[worker_i] = oc; |
johnc@2060 | 333 | |
johnc@2060 | 334 | // A DirtyCardQueue that is used to hold cards containing references |
johnc@2060 | 335 | // that point into the collection set. This DCQ is associated with a |
johnc@2060 | 336 | // special DirtyCardQueueSet (see g1CollectedHeap.hpp). Under normal |
johnc@2060 | 337 | // circumstances (i.e. the pause successfully completes), these cards |
johnc@2060 | 338 | // are just discarded (there's no need to update the RSets of regions |
johnc@2060 | 339 | // that were in the collection set - after the pause these regions |
johnc@2060 | 340 | // are wholly 'free' of live objects. In the event of an evacuation |
johnc@2060 | 341 | // failure the cards/buffers in this queue set are: |
johnc@2060 | 342 | // * passed to the DirtyCardQueueSet that is used to manage deferred |
johnc@2060 | 343 | // RSet updates, or |
johnc@2060 | 344 | // * scanned for references that point into the collection set |
johnc@2060 | 345 | // and the RSet of the corresponding region in the collection set |
johnc@2060 | 346 | // is updated immediately. |
johnc@2060 | 347 | DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); |
johnc@2060 | 348 | |
johnc@2063 | 349 | assert((ParallelGCThreads > 0) || worker_i == 0, "invariant"); |
johnc@2063 | 350 | |
johnc@2063 | 351 | // The two flags below were introduced temporarily to serialize |
johnc@2063 | 352 | // the updating and scanning of remembered sets. There are some |
johnc@2063 | 353 | // race conditions when these two operations are done in parallel |
johnc@2063 | 354 | // and they are causing failures. When we resolve said race |
johnc@2063 | 355 | // conditions, we'll revert back to parallel remembered set |
johnc@2063 | 356 | // updating and scanning. See CRs 6677707 and 6677708. |
johnc@2063 | 357 | if (G1UseParallelRSetUpdating || (worker_i == 0)) { |
johnc@2063 | 358 | updateRS(&into_cset_dcq, worker_i); |
ysr@777 | 359 | } else { |
brutisso@4015 | 360 | _g1p->phase_times()->record_update_rs_processed_buffers(worker_i, 0); |
brutisso@3923 | 361 | _g1p->phase_times()->record_update_rs_time(worker_i, 0.0); |
johnc@2063 | 362 | } |
johnc@2063 | 363 | if (G1UseParallelRSetScanning || (worker_i == 0)) { |
johnc@5548 | 364 | scanRS(oc, code_root_cl, worker_i); |
johnc@2063 | 365 | } else { |
brutisso@3923 | 366 | _g1p->phase_times()->record_scan_rs_time(worker_i, 0.0); |
ysr@777 | 367 | } |
johnc@2060 | 368 | |
johnc@2060 | 369 | // We now clear the cached values of _cset_rs_update_cl for this worker |
johnc@2060 | 370 | _cset_rs_update_cl[worker_i] = NULL; |
ysr@777 | 371 | } |
ysr@777 | 372 | |
johnc@2216 | 373 | void G1RemSet::prepare_for_oops_into_collection_set_do() { |
ysr@777 | 374 | cleanupHRRS(); |
ysr@777 | 375 | ConcurrentG1Refine* cg1r = _g1->concurrent_g1_refine(); |
ysr@777 | 376 | _g1->set_refine_cte_cl_concurrency(false); |
ysr@777 | 377 | DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
ysr@777 | 378 | dcqs.concatenate_logs(); |
ysr@777 | 379 | |
ysr@777 | 380 | guarantee( _cards_scanned == NULL, "invariant" ); |
zgu@3900 | 381 | _cards_scanned = NEW_C_HEAP_ARRAY(size_t, n_workers(), mtGC); |
apetrusenko@980 | 382 | for (uint i = 0; i < n_workers(); ++i) { |
apetrusenko@980 | 383 | _cards_scanned[i] = 0; |
apetrusenko@980 | 384 | } |
ysr@777 | 385 | _total_cards_scanned = 0; |
ysr@777 | 386 | } |
ysr@777 | 387 | |
ysr@777 | 388 | |
johnc@2060 | 389 | // This closure, applied to a DirtyCardQueueSet, is used to immediately |
johnc@2060 | 390 | // update the RSets for the regions in the CSet. For each card it iterates |
johnc@2060 | 391 | // through the oops which coincide with that card. It scans the reference |
johnc@2060 | 392 | // fields in each oop; when it finds an oop that points into the collection |
johnc@2060 | 393 | // set, the RSet for the region containing the referenced object is updated. |
johnc@2060 | 394 | class UpdateRSetCardTableEntryIntoCSetClosure: public CardTableEntryClosure { |
iveresov@1051 | 395 | G1CollectedHeap* _g1; |
johnc@2060 | 396 | CardTableModRefBS* _ct_bs; |
iveresov@1051 | 397 | public: |
johnc@2060 | 398 | UpdateRSetCardTableEntryIntoCSetClosure(G1CollectedHeap* g1, |
johnc@2060 | 399 | CardTableModRefBS* bs): |
johnc@2060 | 400 | _g1(g1), _ct_bs(bs) |
johnc@2060 | 401 | { } |
johnc@2060 | 402 | |
vkempik@6552 | 403 | bool do_card_ptr(jbyte* card_ptr, uint worker_i) { |
johnc@2060 | 404 | // Construct the region representing the card. |
johnc@2060 | 405 | HeapWord* start = _ct_bs->addr_for(card_ptr); |
johnc@2060 | 406 | // And find the region containing it. |
johnc@2060 | 407 | HeapRegion* r = _g1->heap_region_containing(start); |
johnc@2060 | 408 | |
johnc@2060 | 409 | // Scan oops in the card looking for references into the collection set |
coleenp@4037 | 410 | // Don't use addr_for(card_ptr + 1) which can ask for |
coleenp@4037 | 411 | // a card beyond the heap. This is not safe without a perm |
coleenp@4037 | 412 | // gen. |
coleenp@4037 | 413 | HeapWord* end = start + CardTableModRefBS::card_size_in_words; |
johnc@2060 | 414 | MemRegion scanRegion(start, end); |
johnc@2060 | 415 | |
johnc@2060 | 416 | UpdateRSetImmediate update_rs_cl(_g1->g1_rem_set()); |
johnc@3179 | 417 | FilterIntoCSClosure update_rs_cset_oop_cl(NULL, _g1, &update_rs_cl); |
johnc@2060 | 418 | FilterOutOfRegionClosure filter_then_update_rs_cset_oop_cl(r, &update_rs_cset_oop_cl); |
johnc@2060 | 419 | |
johnc@2060 | 420 | // We can pass false as the "filter_young" parameter here as: |
johnc@2060 | 421 | // * we should be in a STW pause, |
johnc@2060 | 422 | // * the DCQS to which this closure is applied is used to hold |
johnc@2060 | 423 | // references that point into the collection set from the prior |
johnc@2060 | 424 | // RSet updating, |
johnc@2060 | 425 | // * the post-write barrier shouldn't be logging updates to young |
johnc@2060 | 426 | // regions (but there is a situation where this can happen - see |
johnc@5078 | 427 | // the comment in G1RemSet::refine_card() below - |
johnc@2060 | 428 | // that should not be applicable here), and |
johnc@2060 | 429 | // * during actual RSet updating, the filtering of cards in young |
johnc@2060 | 430 | // regions in HeapRegion::oops_on_card_seq_iterate_careful is |
johnc@2060 | 431 | // employed. |
johnc@2060 | 432 | // As a result, when this closure is applied to "refs into cset" |
johnc@2060 | 433 | // DCQS, we shouldn't see any cards in young regions. |
johnc@2060 | 434 | update_rs_cl.set_region(r); |
johnc@2060 | 435 | HeapWord* stop_point = |
johnc@2060 | 436 | r->oops_on_card_seq_iterate_careful(scanRegion, |
tonyp@2849 | 437 | &filter_then_update_rs_cset_oop_cl, |
tonyp@2849 | 438 | false /* filter_young */, |
tonyp@2849 | 439 | NULL /* card_ptr */); |
johnc@2060 | 440 | |
johnc@2060 | 441 | // Since this is performed in the event of an evacuation failure, we |
johnc@2060 | 442 | // we shouldn't see a non-null stop point |
johnc@2060 | 443 | assert(stop_point == NULL, "saw an unallocated region"); |
johnc@2060 | 444 | return true; |
iveresov@1051 | 445 | } |
iveresov@1051 | 446 | }; |
iveresov@1051 | 447 | |
johnc@2216 | 448 | void G1RemSet::cleanup_after_oops_into_collection_set_do() { |
ysr@777 | 449 | guarantee( _cards_scanned != NULL, "invariant" ); |
ysr@777 | 450 | _total_cards_scanned = 0; |
tonyp@2974 | 451 | for (uint i = 0; i < n_workers(); ++i) { |
ysr@777 | 452 | _total_cards_scanned += _cards_scanned[i]; |
tonyp@2974 | 453 | } |
zgu@3900 | 454 | FREE_C_HEAP_ARRAY(size_t, _cards_scanned, mtGC); |
ysr@777 | 455 | _cards_scanned = NULL; |
ysr@777 | 456 | // Cleanup after copy |
ysr@777 | 457 | _g1->set_refine_cte_cl_concurrency(true); |
ysr@777 | 458 | // Set all cards back to clean. |
ysr@777 | 459 | _g1->cleanUpCardTable(); |
iveresov@1229 | 460 | |
johnc@2060 | 461 | DirtyCardQueueSet& into_cset_dcqs = _g1->into_cset_dirty_card_queue_set(); |
johnc@2060 | 462 | int into_cset_n_buffers = into_cset_dcqs.completed_buffers_num(); |
johnc@2060 | 463 | |
iveresov@1051 | 464 | if (_g1->evacuation_failed()) { |
tschatzl@6406 | 465 | double restore_remembered_set_start = os::elapsedTime(); |
tschatzl@6406 | 466 | |
johnc@2060 | 467 | // Restore remembered sets for the regions pointing into the collection set. |
iveresov@1051 | 468 | if (G1DeferredRSUpdate) { |
johnc@2060 | 469 | // If deferred RS updates are enabled then we just need to transfer |
johnc@2060 | 470 | // the completed buffers from (a) the DirtyCardQueueSet used to hold |
johnc@2060 | 471 | // cards that contain references that point into the collection set |
johnc@2060 | 472 | // to (b) the DCQS used to hold the deferred RS updates |
johnc@2060 | 473 | _g1->dirty_card_queue_set().merge_bufferlists(&into_cset_dcqs); |
iveresov@1051 | 474 | } else { |
johnc@2060 | 475 | |
johnc@2060 | 476 | CardTableModRefBS* bs = (CardTableModRefBS*)_g1->barrier_set(); |
johnc@2060 | 477 | UpdateRSetCardTableEntryIntoCSetClosure update_rs_cset_immediate(_g1, bs); |
johnc@2060 | 478 | |
johnc@2060 | 479 | int n_completed_buffers = 0; |
johnc@2060 | 480 | while (into_cset_dcqs.apply_closure_to_completed_buffer(&update_rs_cset_immediate, |
johnc@2060 | 481 | 0, 0, true)) { |
johnc@2060 | 482 | n_completed_buffers++; |
johnc@2060 | 483 | } |
johnc@2060 | 484 | assert(n_completed_buffers == into_cset_n_buffers, "missed some buffers"); |
iveresov@1051 | 485 | } |
tschatzl@6406 | 486 | |
tschatzl@6406 | 487 | _g1->g1_policy()->phase_times()->record_evac_fail_restore_remsets((os::elapsedTime() - restore_remembered_set_start) * 1000.0); |
iveresov@1051 | 488 | } |
johnc@2060 | 489 | |
johnc@2060 | 490 | // Free any completed buffers in the DirtyCardQueueSet used to hold cards |
johnc@2060 | 491 | // which contain references that point into the collection. |
johnc@2060 | 492 | _g1->into_cset_dirty_card_queue_set().clear(); |
johnc@2060 | 493 | assert(_g1->into_cset_dirty_card_queue_set().completed_buffers_num() == 0, |
johnc@2060 | 494 | "all buffers should be freed"); |
johnc@2060 | 495 | _g1->into_cset_dirty_card_queue_set().clear_n_completed_buffers(); |
ysr@777 | 496 | } |
ysr@777 | 497 | |
ysr@777 | 498 | class ScrubRSClosure: public HeapRegionClosure { |
ysr@777 | 499 | G1CollectedHeap* _g1h; |
ysr@777 | 500 | BitMap* _region_bm; |
ysr@777 | 501 | BitMap* _card_bm; |
ysr@777 | 502 | CardTableModRefBS* _ctbs; |
ysr@777 | 503 | public: |
ysr@777 | 504 | ScrubRSClosure(BitMap* region_bm, BitMap* card_bm) : |
ysr@777 | 505 | _g1h(G1CollectedHeap::heap()), |
ysr@777 | 506 | _region_bm(region_bm), _card_bm(card_bm), |
mgerdin@5811 | 507 | _ctbs(_g1h->g1_barrier_set()) {} |
ysr@777 | 508 | |
ysr@777 | 509 | bool doHeapRegion(HeapRegion* r) { |
ysr@777 | 510 | if (!r->continuesHumongous()) { |
ysr@777 | 511 | r->rem_set()->scrub(_ctbs, _region_bm, _card_bm); |
ysr@777 | 512 | } |
ysr@777 | 513 | return false; |
ysr@777 | 514 | } |
ysr@777 | 515 | }; |
ysr@777 | 516 | |
johnc@2216 | 517 | void G1RemSet::scrub(BitMap* region_bm, BitMap* card_bm) { |
ysr@777 | 518 | ScrubRSClosure scrub_cl(region_bm, card_bm); |
ysr@777 | 519 | _g1->heap_region_iterate(&scrub_cl); |
ysr@777 | 520 | } |
ysr@777 | 521 | |
johnc@2216 | 522 | void G1RemSet::scrub_par(BitMap* region_bm, BitMap* card_bm, |
jmasa@3357 | 523 | uint worker_num, int claim_val) { |
ysr@777 | 524 | ScrubRSClosure scrub_cl(region_bm, card_bm); |
jmasa@3294 | 525 | _g1->heap_region_par_iterate_chunked(&scrub_cl, |
jmasa@3294 | 526 | worker_num, |
jmasa@3357 | 527 | n_workers(), |
jmasa@3294 | 528 | claim_val); |
ysr@777 | 529 | } |
ysr@777 | 530 | |
johnc@3466 | 531 | G1TriggerClosure::G1TriggerClosure() : |
johnc@3466 | 532 | _triggered(false) { } |
johnc@2060 | 533 | |
johnc@3466 | 534 | G1InvokeIfNotTriggeredClosure::G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t_cl, |
johnc@3466 | 535 | OopClosure* oop_cl) : |
johnc@3466 | 536 | _trigger_cl(t_cl), _oop_cl(oop_cl) { } |
johnc@3466 | 537 | |
johnc@3466 | 538 | G1Mux2Closure::G1Mux2Closure(OopClosure *c1, OopClosure *c2) : |
johnc@3466 | 539 | _c1(c1), _c2(c2) { } |
johnc@3466 | 540 | |
johnc@3466 | 541 | G1UpdateRSOrPushRefOopClosure:: |
johnc@3466 | 542 | G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h, |
johnc@3466 | 543 | G1RemSet* rs, |
johnc@3466 | 544 | OopsInHeapRegionClosure* push_ref_cl, |
johnc@3466 | 545 | bool record_refs_into_cset, |
vkempik@6552 | 546 | uint worker_i) : |
johnc@3466 | 547 | _g1(g1h), _g1_rem_set(rs), _from(NULL), |
johnc@3466 | 548 | _record_refs_into_cset(record_refs_into_cset), |
johnc@3466 | 549 | _push_ref_cl(push_ref_cl), _worker_i(worker_i) { } |
johnc@2060 | 550 | |
johnc@5078 | 551 | // Returns true if the given card contains references that point |
johnc@5078 | 552 | // into the collection set, if we're checking for such references; |
johnc@5078 | 553 | // false otherwise. |
johnc@5078 | 554 | |
vkempik@6552 | 555 | bool G1RemSet::refine_card(jbyte* card_ptr, uint worker_i, |
johnc@5078 | 556 | bool check_for_refs_into_cset) { |
tschatzl@7051 | 557 | assert(_g1->is_in_exact(_ct_bs->addr_for(card_ptr)), |
tschatzl@7051 | 558 | err_msg("Card at "PTR_FORMAT" index "SIZE_FORMAT" representing heap at "PTR_FORMAT" (%u) must be in committed heap", |
tschatzl@7051 | 559 | p2i(card_ptr), |
tschatzl@7051 | 560 | _ct_bs->index_for(_ct_bs->addr_for(card_ptr)), |
tschatzl@7051 | 561 | _ct_bs->addr_for(card_ptr), |
tschatzl@7051 | 562 | _g1->addr_to_region(_ct_bs->addr_for(card_ptr)))); |
johnc@5078 | 563 | |
johnc@5078 | 564 | // If the card is no longer dirty, nothing to do. |
johnc@5078 | 565 | if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
johnc@5078 | 566 | // No need to return that this card contains refs that point |
johnc@5078 | 567 | // into the collection set. |
johnc@5078 | 568 | return false; |
johnc@5078 | 569 | } |
johnc@5078 | 570 | |
johnc@1325 | 571 | // Construct the region representing the card. |
johnc@1325 | 572 | HeapWord* start = _ct_bs->addr_for(card_ptr); |
johnc@1325 | 573 | // And find the region containing it. |
johnc@1325 | 574 | HeapRegion* r = _g1->heap_region_containing(start); |
johnc@5078 | 575 | |
johnc@5078 | 576 | // Why do we have to check here whether a card is on a young region, |
johnc@5078 | 577 | // given that we dirty young regions and, as a result, the |
johnc@5078 | 578 | // post-barrier is supposed to filter them out and never to enqueue |
johnc@5078 | 579 | // them? When we allocate a new region as the "allocation region" we |
johnc@5078 | 580 | // actually dirty its cards after we release the lock, since card |
johnc@5078 | 581 | // dirtying while holding the lock was a performance bottleneck. So, |
johnc@5078 | 582 | // as a result, it is possible for other threads to actually |
johnc@5078 | 583 | // allocate objects in the region (after the acquire the lock) |
johnc@5078 | 584 | // before all the cards on the region are dirtied. This is unlikely, |
johnc@5078 | 585 | // and it doesn't happen often, but it can happen. So, the extra |
johnc@5078 | 586 | // check below filters out those cards. |
johnc@5078 | 587 | if (r->is_young()) { |
johnc@5078 | 588 | return false; |
johnc@5078 | 589 | } |
johnc@5078 | 590 | |
johnc@5078 | 591 | // While we are processing RSet buffers during the collection, we |
johnc@5078 | 592 | // actually don't want to scan any cards on the collection set, |
johnc@5078 | 593 | // since we don't want to update remebered sets with entries that |
johnc@5078 | 594 | // point into the collection set, given that live objects from the |
johnc@5078 | 595 | // collection set are about to move and such entries will be stale |
johnc@5078 | 596 | // very soon. This change also deals with a reliability issue which |
johnc@5078 | 597 | // involves scanning a card in the collection set and coming across |
johnc@5078 | 598 | // an array that was being chunked and looking malformed. Note, |
johnc@5078 | 599 | // however, that if evacuation fails, we have to scan any objects |
johnc@5078 | 600 | // that were not moved and create any missing entries. |
johnc@5078 | 601 | if (r->in_collection_set()) { |
johnc@5078 | 602 | return false; |
johnc@5078 | 603 | } |
johnc@5078 | 604 | |
johnc@5078 | 605 | // The result from the hot card cache insert call is either: |
johnc@5078 | 606 | // * pointer to the current card |
johnc@5078 | 607 | // (implying that the current card is not 'hot'), |
johnc@5078 | 608 | // * null |
johnc@5078 | 609 | // (meaning we had inserted the card ptr into the "hot" card cache, |
johnc@5078 | 610 | // which had some headroom), |
johnc@5078 | 611 | // * a pointer to a "hot" card that was evicted from the "hot" cache. |
johnc@5078 | 612 | // |
johnc@5078 | 613 | |
johnc@5078 | 614 | G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
johnc@5078 | 615 | if (hot_card_cache->use_cache()) { |
johnc@5078 | 616 | assert(!check_for_refs_into_cset, "sanity"); |
johnc@5078 | 617 | assert(!SafepointSynchronize::is_at_safepoint(), "sanity"); |
johnc@5078 | 618 | |
johnc@5078 | 619 | card_ptr = hot_card_cache->insert(card_ptr); |
johnc@5078 | 620 | if (card_ptr == NULL) { |
johnc@5078 | 621 | // There was no eviction. Nothing to do. |
johnc@5078 | 622 | return false; |
johnc@5078 | 623 | } |
johnc@5078 | 624 | |
johnc@5078 | 625 | start = _ct_bs->addr_for(card_ptr); |
johnc@5078 | 626 | r = _g1->heap_region_containing(start); |
johnc@5078 | 627 | |
johnc@5078 | 628 | // Checking whether the region we got back from the cache |
johnc@5078 | 629 | // is young here is inappropriate. The region could have been |
johnc@5078 | 630 | // freed, reallocated and tagged as young while in the cache. |
johnc@5078 | 631 | // Hence we could see its young type change at any time. |
johnc@5078 | 632 | } |
johnc@1325 | 633 | |
coleenp@4037 | 634 | // Don't use addr_for(card_ptr + 1) which can ask for |
coleenp@4037 | 635 | // a card beyond the heap. This is not safe without a perm |
coleenp@4037 | 636 | // gen at the upper end of the heap. |
coleenp@4037 | 637 | HeapWord* end = start + CardTableModRefBS::card_size_in_words; |
johnc@1325 | 638 | MemRegion dirtyRegion(start, end); |
johnc@1325 | 639 | |
johnc@1325 | 640 | #if CARD_REPEAT_HISTO |
johnc@2504 | 641 | init_ct_freq_table(_g1->max_capacity()); |
johnc@1325 | 642 | ct_freq_note_card(_ct_bs->index_for(start)); |
johnc@1325 | 643 | #endif |
johnc@1325 | 644 | |
brutisso@3267 | 645 | OopsInHeapRegionClosure* oops_in_heap_closure = NULL; |
brutisso@3267 | 646 | if (check_for_refs_into_cset) { |
brutisso@3267 | 647 | // ConcurrentG1RefineThreads have worker numbers larger than what |
brutisso@3267 | 648 | // _cset_rs_update_cl[] is set up to handle. But those threads should |
brutisso@3267 | 649 | // only be active outside of a collection which means that when they |
brutisso@3267 | 650 | // reach here they should have check_for_refs_into_cset == false. |
brutisso@3267 | 651 | assert((size_t)worker_i < n_workers(), "index of worker larger than _cset_rs_update_cl[].length"); |
brutisso@3267 | 652 | oops_in_heap_closure = _cset_rs_update_cl[worker_i]; |
brutisso@3267 | 653 | } |
johnc@3466 | 654 | G1UpdateRSOrPushRefOopClosure update_rs_oop_cl(_g1, |
johnc@3466 | 655 | _g1->g1_rem_set(), |
johnc@3466 | 656 | oops_in_heap_closure, |
johnc@3466 | 657 | check_for_refs_into_cset, |
johnc@3466 | 658 | worker_i); |
johnc@1325 | 659 | update_rs_oop_cl.set_from(r); |
johnc@2060 | 660 | |
johnc@3466 | 661 | G1TriggerClosure trigger_cl; |
johnc@3179 | 662 | FilterIntoCSClosure into_cs_cl(NULL, _g1, &trigger_cl); |
johnc@3466 | 663 | G1InvokeIfNotTriggeredClosure invoke_cl(&trigger_cl, &into_cs_cl); |
johnc@3466 | 664 | G1Mux2Closure mux(&invoke_cl, &update_rs_oop_cl); |
johnc@2060 | 665 | |
johnc@2060 | 666 | FilterOutOfRegionClosure filter_then_update_rs_oop_cl(r, |
johnc@2060 | 667 | (check_for_refs_into_cset ? |
johnc@2060 | 668 | (OopClosure*)&mux : |
johnc@2060 | 669 | (OopClosure*)&update_rs_oop_cl)); |
johnc@1325 | 670 | |
johnc@2021 | 671 | // The region for the current card may be a young region. The |
johnc@2021 | 672 | // current card may have been a card that was evicted from the |
johnc@2021 | 673 | // card cache. When the card was inserted into the cache, we had |
johnc@2021 | 674 | // determined that its region was non-young. While in the cache, |
johnc@2021 | 675 | // the region may have been freed during a cleanup pause, reallocated |
johnc@2021 | 676 | // and tagged as young. |
johnc@2021 | 677 | // |
johnc@2021 | 678 | // We wish to filter out cards for such a region but the current |
tonyp@2849 | 679 | // thread, if we're running concurrently, may "see" the young type |
johnc@2021 | 680 | // change at any time (so an earlier "is_young" check may pass or |
johnc@2021 | 681 | // fail arbitrarily). We tell the iteration code to perform this |
johnc@2021 | 682 | // filtering when it has been determined that there has been an actual |
johnc@2021 | 683 | // allocation in this region and making it safe to check the young type. |
johnc@2021 | 684 | bool filter_young = true; |
johnc@2021 | 685 | |
johnc@1325 | 686 | HeapWord* stop_point = |
johnc@1325 | 687 | r->oops_on_card_seq_iterate_careful(dirtyRegion, |
johnc@2021 | 688 | &filter_then_update_rs_oop_cl, |
tonyp@2849 | 689 | filter_young, |
tonyp@2849 | 690 | card_ptr); |
johnc@2021 | 691 | |
johnc@1325 | 692 | // If stop_point is non-null, then we encountered an unallocated region |
johnc@1325 | 693 | // (perhaps the unfilled portion of a TLAB.) For now, we'll dirty the |
johnc@1325 | 694 | // card and re-enqueue: if we put off the card until a GC pause, then the |
johnc@1325 | 695 | // unallocated portion will be filled in. Alternatively, we might try |
johnc@1325 | 696 | // the full complexity of the technique used in "regular" precleaning. |
johnc@1325 | 697 | if (stop_point != NULL) { |
johnc@1325 | 698 | // The card might have gotten re-dirtied and re-enqueued while we |
johnc@1325 | 699 | // worked. (In fact, it's pretty likely.) |
johnc@1325 | 700 | if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
johnc@1325 | 701 | *card_ptr = CardTableModRefBS::dirty_card_val(); |
johnc@1325 | 702 | MutexLockerEx x(Shared_DirtyCardQ_lock, |
johnc@1325 | 703 | Mutex::_no_safepoint_check_flag); |
johnc@1325 | 704 | DirtyCardQueue* sdcq = |
johnc@1325 | 705 | JavaThread::dirty_card_queue_set().shared_dirty_card_queue(); |
johnc@1325 | 706 | sdcq->enqueue(card_ptr); |
johnc@1325 | 707 | } |
johnc@1325 | 708 | } else { |
johnc@1325 | 709 | _conc_refine_cards++; |
johnc@1325 | 710 | } |
johnc@2060 | 711 | |
johnc@5078 | 712 | // This gets set to true if the card being refined has |
johnc@5078 | 713 | // references that point into the collection set. |
johnc@5078 | 714 | bool has_refs_into_cset = trigger_cl.triggered(); |
johnc@1325 | 715 | |
johnc@5078 | 716 | // We should only be detecting that the card contains references |
johnc@5078 | 717 | // that point into the collection set if the current thread is |
johnc@5078 | 718 | // a GC worker thread. |
johnc@5078 | 719 | assert(!has_refs_into_cset || SafepointSynchronize::is_at_safepoint(), |
johnc@5078 | 720 | "invalid result at non safepoint"); |
ysr@777 | 721 | |
johnc@5078 | 722 | return has_refs_into_cset; |
ysr@777 | 723 | } |
ysr@777 | 724 | |
tschatzl@5807 | 725 | void G1RemSet::print_periodic_summary_info(const char* header) { |
tschatzl@5204 | 726 | G1RemSetSummary current; |
tschatzl@5812 | 727 | current.initialize(this); |
ysr@777 | 728 | |
tschatzl@5204 | 729 | _prev_period_summary.subtract_from(¤t); |
tschatzl@5807 | 730 | print_summary_info(&_prev_period_summary, header); |
ysr@777 | 731 | |
tschatzl@5204 | 732 | _prev_period_summary.set(¤t); |
tschatzl@5204 | 733 | } |
iveresov@1229 | 734 | |
johnc@2216 | 735 | void G1RemSet::print_summary_info() { |
tschatzl@5204 | 736 | G1RemSetSummary current; |
tschatzl@5812 | 737 | current.initialize(this); |
tschatzl@5204 | 738 | |
tschatzl@5204 | 739 | print_summary_info(¤t, " Cumulative RS summary"); |
tschatzl@5204 | 740 | } |
tschatzl@5204 | 741 | |
tschatzl@5204 | 742 | void G1RemSet::print_summary_info(G1RemSetSummary * summary, const char * header) { |
tschatzl@5204 | 743 | assert(summary != NULL, "just checking"); |
tschatzl@5204 | 744 | |
tschatzl@5204 | 745 | if (header != NULL) { |
tschatzl@5204 | 746 | gclog_or_tty->print_cr("%s", header); |
tschatzl@5204 | 747 | } |
ysr@777 | 748 | |
ysr@777 | 749 | #if CARD_REPEAT_HISTO |
ysr@777 | 750 | gclog_or_tty->print_cr("\nG1 card_repeat count histogram: "); |
ysr@777 | 751 | gclog_or_tty->print_cr(" # of repeats --> # of cards with that number."); |
ysr@777 | 752 | card_repeat_count.print_on(gclog_or_tty); |
ysr@777 | 753 | #endif |
ysr@777 | 754 | |
tschatzl@5204 | 755 | summary->print_on(gclog_or_tty); |
ysr@777 | 756 | } |
johnc@2060 | 757 | |
johnc@2216 | 758 | void G1RemSet::prepare_for_verify() { |
iveresov@1072 | 759 | if (G1HRRSFlushLogBuffersOnVerify && |
iveresov@1072 | 760 | (VerifyBeforeGC || VerifyAfterGC) |
johnc@5205 | 761 | && (!_g1->full_collection() || G1VerifyRSetsDuringFullGC)) { |
ysr@777 | 762 | cleanupHRRS(); |
ysr@777 | 763 | _g1->set_refine_cte_cl_concurrency(false); |
ysr@777 | 764 | if (SafepointSynchronize::is_at_safepoint()) { |
ysr@777 | 765 | DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
ysr@777 | 766 | dcqs.concatenate_logs(); |
ysr@777 | 767 | } |
johnc@5078 | 768 | |
johnc@5078 | 769 | G1HotCardCache* hot_card_cache = _cg1r->hot_card_cache(); |
johnc@5078 | 770 | bool use_hot_card_cache = hot_card_cache->use_cache(); |
johnc@5078 | 771 | hot_card_cache->set_use_cache(false); |
johnc@5078 | 772 | |
johnc@2060 | 773 | DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); |
johnc@2060 | 774 | updateRS(&into_cset_dcq, 0); |
johnc@2060 | 775 | _g1->into_cset_dirty_card_queue_set().clear(); |
iveresov@1072 | 776 | |
johnc@5078 | 777 | hot_card_cache->set_use_cache(use_hot_card_cache); |
iveresov@1072 | 778 | assert(JavaThread::dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
ysr@777 | 779 | } |
ysr@777 | 780 | } |