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annotate src/share/vm/gc_implementation/g1/g1RemSet.cpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | b81f3572f355 |
| children | 215576b54709 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2009, 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 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_g1RemSet.cpp.incl" | |
| 27 | |
| 28 #define CARD_REPEAT_HISTO 0 | |
| 29 | |
| 30 #if CARD_REPEAT_HISTO | |
| 31 static size_t ct_freq_sz; | |
| 32 static jbyte* ct_freq = NULL; | |
| 33 | |
| 34 void init_ct_freq_table(size_t heap_sz_bytes) { | |
| 35 if (ct_freq == NULL) { | |
| 36 ct_freq_sz = heap_sz_bytes/CardTableModRefBS::card_size; | |
| 37 ct_freq = new jbyte[ct_freq_sz]; | |
| 38 for (size_t j = 0; j < ct_freq_sz; j++) ct_freq[j] = 0; | |
| 39 } | |
| 40 } | |
| 41 | |
| 42 void ct_freq_note_card(size_t index) { | |
| 43 assert(0 <= index && index < ct_freq_sz, "Bounds error."); | |
| 44 if (ct_freq[index] < 100) { ct_freq[index]++; } | |
| 45 } | |
| 46 | |
| 47 static IntHistogram card_repeat_count(10, 10); | |
| 48 | |
| 49 void ct_freq_update_histo_and_reset() { | |
| 50 for (size_t j = 0; j < ct_freq_sz; j++) { | |
| 51 card_repeat_count.add_entry(ct_freq[j]); | |
| 52 ct_freq[j] = 0; | |
| 53 } | |
| 54 | |
| 55 } | |
| 56 #endif | |
| 57 | |
| 58 | |
| 59 class IntoCSOopClosure: public OopsInHeapRegionClosure { | |
| 60 OopsInHeapRegionClosure* _blk; | |
| 61 G1CollectedHeap* _g1; | |
| 62 public: | |
| 63 IntoCSOopClosure(G1CollectedHeap* g1, OopsInHeapRegionClosure* blk) : | |
| 64 _g1(g1), _blk(blk) {} | |
| 65 void set_region(HeapRegion* from) { | |
| 66 _blk->set_region(from); | |
| 67 } | |
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68 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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69 virtual void do_oop( oop* p) { do_oop_work(p); } |
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70 template <class T> void do_oop_work(T* p) { |
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71 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 72 if (_g1->obj_in_cs(obj)) _blk->do_oop(p); |
| 73 } | |
| 74 bool apply_to_weak_ref_discovered_field() { return true; } | |
| 75 bool idempotent() { return true; } | |
| 76 }; | |
| 77 | |
| 78 class IntoCSRegionClosure: public HeapRegionClosure { | |
| 79 IntoCSOopClosure _blk; | |
| 80 G1CollectedHeap* _g1; | |
| 81 public: | |
| 82 IntoCSRegionClosure(G1CollectedHeap* g1, OopsInHeapRegionClosure* blk) : | |
| 83 _g1(g1), _blk(g1, blk) {} | |
| 84 bool doHeapRegion(HeapRegion* r) { | |
| 85 if (!r->in_collection_set()) { | |
| 86 _blk.set_region(r); | |
| 87 if (r->isHumongous()) { | |
| 88 if (r->startsHumongous()) { | |
| 89 oop obj = oop(r->bottom()); | |
| 90 obj->oop_iterate(&_blk); | |
| 91 } | |
| 92 } else { | |
| 93 r->oop_before_save_marks_iterate(&_blk); | |
| 94 } | |
| 95 } | |
| 96 return false; | |
| 97 } | |
| 98 }; | |
| 99 | |
| 100 void | |
| 101 StupidG1RemSet::oops_into_collection_set_do(OopsInHeapRegionClosure* oc, | |
| 102 int worker_i) { | |
| 103 IntoCSRegionClosure rc(_g1, oc); | |
| 104 _g1->heap_region_iterate(&rc); | |
| 105 } | |
| 106 | |
| 107 class VerifyRSCleanCardOopClosure: public OopClosure { | |
| 108 G1CollectedHeap* _g1; | |
| 109 public: | |
| 110 VerifyRSCleanCardOopClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
| 111 | |
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112 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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113 virtual void do_oop( oop* p) { do_oop_work(p); } |
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114 template <class T> void do_oop_work(T* p) { |
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115 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 116 HeapRegion* to = _g1->heap_region_containing(obj); |
| 117 guarantee(to == NULL || !to->in_collection_set(), | |
| 118 "Missed a rem set member."); | |
| 119 } | |
| 120 }; | |
| 121 | |
| 122 HRInto_G1RemSet::HRInto_G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs) | |
| 123 : G1RemSet(g1), _ct_bs(ct_bs), _g1p(_g1->g1_policy()), | |
| 124 _cg1r(g1->concurrent_g1_refine()), | |
| 125 _par_traversal_in_progress(false), _new_refs(NULL), | |
| 126 _cards_scanned(NULL), _total_cards_scanned(0) | |
| 127 { | |
| 128 _seq_task = new SubTasksDone(NumSeqTasks); | |
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129 guarantee(n_workers() > 0, "There should be some workers"); |
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130 _new_refs = NEW_C_HEAP_ARRAY(GrowableArray<OopOrNarrowOopStar>*, n_workers()); |
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131 for (uint i = 0; i < n_workers(); i++) { |
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132 _new_refs[i] = new (ResourceObj::C_HEAP) GrowableArray<OopOrNarrowOopStar>(8192,true); |
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133 } |
| 342 | 134 } |
| 135 | |
| 136 HRInto_G1RemSet::~HRInto_G1RemSet() { | |
| 137 delete _seq_task; | |
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138 for (uint i = 0; i < n_workers(); i++) { |
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139 delete _new_refs[i]; |
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140 } |
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141 FREE_C_HEAP_ARRAY(GrowableArray<OopOrNarrowOopStar>*, _new_refs); |
| 342 | 142 } |
| 143 | |
| 144 void CountNonCleanMemRegionClosure::do_MemRegion(MemRegion mr) { | |
| 145 if (_g1->is_in_g1_reserved(mr.start())) { | |
| 146 _n += (int) ((mr.byte_size() / CardTableModRefBS::card_size)); | |
| 147 if (_start_first == NULL) _start_first = mr.start(); | |
| 148 } | |
| 149 } | |
| 150 | |
| 151 class ScanRSClosure : public HeapRegionClosure { | |
| 152 size_t _cards_done, _cards; | |
| 153 G1CollectedHeap* _g1h; | |
| 154 OopsInHeapRegionClosure* _oc; | |
| 155 G1BlockOffsetSharedArray* _bot_shared; | |
| 156 CardTableModRefBS *_ct_bs; | |
| 157 int _worker_i; | |
| 1261 | 158 int _block_size; |
| 342 | 159 bool _try_claimed; |
| 160 public: | |
| 161 ScanRSClosure(OopsInHeapRegionClosure* oc, int worker_i) : | |
| 162 _oc(oc), | |
| 163 _cards(0), | |
| 164 _cards_done(0), | |
| 165 _worker_i(worker_i), | |
| 166 _try_claimed(false) | |
| 167 { | |
| 168 _g1h = G1CollectedHeap::heap(); | |
| 169 _bot_shared = _g1h->bot_shared(); | |
| 170 _ct_bs = (CardTableModRefBS*) (_g1h->barrier_set()); | |
| 1261 | 171 _block_size = MAX2<int>(G1RSetScanBlockSize, 1); |
| 342 | 172 } |
| 173 | |
| 174 void set_try_claimed() { _try_claimed = true; } | |
| 175 | |
| 176 void scanCard(size_t index, HeapRegion *r) { | |
| 177 _cards_done++; | |
| 178 DirtyCardToOopClosure* cl = | |
| 179 r->new_dcto_closure(_oc, | |
| 180 CardTableModRefBS::Precise, | |
| 181 HeapRegionDCTOC::IntoCSFilterKind); | |
| 182 | |
| 183 // Set the "from" region in the closure. | |
| 184 _oc->set_region(r); | |
| 185 HeapWord* card_start = _bot_shared->address_for_index(index); | |
| 186 HeapWord* card_end = card_start + G1BlockOffsetSharedArray::N_words; | |
| 187 Space *sp = SharedHeap::heap()->space_containing(card_start); | |
| 188 MemRegion sm_region; | |
| 189 if (ParallelGCThreads > 0) { | |
| 190 // first find the used area | |
| 191 sm_region = sp->used_region_at_save_marks(); | |
| 192 } else { | |
| 193 // The closure is not idempotent. We shouldn't look at objects | |
| 194 // allocated during the GC. | |
| 195 sm_region = sp->used_region_at_save_marks(); | |
| 196 } | |
| 197 MemRegion mr = sm_region.intersection(MemRegion(card_start,card_end)); | |
| 198 if (!mr.is_empty()) { | |
| 199 cl->do_MemRegion(mr); | |
| 200 } | |
| 201 } | |
| 202 | |
| 203 void printCard(HeapRegion* card_region, size_t card_index, | |
| 204 HeapWord* card_start) { | |
| 205 gclog_or_tty->print_cr("T %d Region [" PTR_FORMAT ", " PTR_FORMAT ") " | |
| 206 "RS names card %p: " | |
| 207 "[" PTR_FORMAT ", " PTR_FORMAT ")", | |
| 208 _worker_i, | |
| 209 card_region->bottom(), card_region->end(), | |
| 210 card_index, | |
| 211 card_start, card_start + G1BlockOffsetSharedArray::N_words); | |
| 212 } | |
| 213 | |
| 214 bool doHeapRegion(HeapRegion* r) { | |
| 215 assert(r->in_collection_set(), "should only be called on elements of CS."); | |
| 216 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 217 if (hrrs->iter_is_complete()) return false; // All done. | |
| 218 if (!_try_claimed && !hrrs->claim_iter()) return false; | |
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219 _g1h->push_dirty_cards_region(r); |
| 342 | 220 // If we didn't return above, then |
| 221 // _try_claimed || r->claim_iter() | |
| 222 // is true: either we're supposed to work on claimed-but-not-complete | |
| 223 // regions, or we successfully claimed the region. | |
| 224 HeapRegionRemSetIterator* iter = _g1h->rem_set_iterator(_worker_i); | |
| 225 hrrs->init_iterator(iter); | |
| 226 size_t card_index; | |
| 1261 | 227 |
| 228 // We claim cards in block so as to recude the contention. The block size is determined by | |
| 229 // the G1RSetScanBlockSize parameter. | |
| 230 size_t jump_to_card = hrrs->iter_claimed_next(_block_size); | |
| 231 for (size_t current_card = 0; iter->has_next(card_index); current_card++) { | |
| 232 if (current_card >= jump_to_card + _block_size) { | |
| 233 jump_to_card = hrrs->iter_claimed_next(_block_size); | |
| 747 | 234 } |
| 1261 | 235 if (current_card < jump_to_card) continue; |
| 342 | 236 HeapWord* card_start = _g1h->bot_shared()->address_for_index(card_index); |
| 237 #if 0 | |
| 238 gclog_or_tty->print("Rem set iteration yielded card [" PTR_FORMAT ", " PTR_FORMAT ").\n", | |
| 239 card_start, card_start + CardTableModRefBS::card_size_in_words); | |
| 240 #endif | |
| 241 | |
| 242 HeapRegion* card_region = _g1h->heap_region_containing(card_start); | |
| 243 assert(card_region != NULL, "Yielding cards not in the heap?"); | |
| 244 _cards++; | |
| 245 | |
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246 if (!card_region->is_on_dirty_cards_region_list()) { |
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247 _g1h->push_dirty_cards_region(card_region); |
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248 } |
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249 |
| 747 | 250 // If the card is dirty, then we will scan it during updateRS. |
| 251 if (!card_region->in_collection_set() && !_ct_bs->is_card_dirty(card_index)) { | |
| 1261 | 252 // We make the card as "claimed" lazily (so races are possible but they're benign), |
| 253 // which reduces the number of duplicate scans (the rsets of the regions in the cset | |
| 254 // can intersect). | |
| 255 if (!_ct_bs->is_card_claimed(card_index)) { | |
| 256 _ct_bs->set_card_claimed(card_index); | |
| 257 scanCard(card_index, card_region); | |
| 258 } | |
| 342 | 259 } |
| 260 } | |
| 747 | 261 if (!_try_claimed) { |
| 262 hrrs->set_iter_complete(); | |
| 263 } | |
| 342 | 264 return false; |
| 265 } | |
| 266 // Set all cards back to clean. | |
| 267 void cleanup() {_g1h->cleanUpCardTable();} | |
| 268 size_t cards_done() { return _cards_done;} | |
| 269 size_t cards_looked_up() { return _cards;} | |
| 270 }; | |
| 271 | |
| 272 // We want the parallel threads to start their scanning at | |
| 273 // different collection set regions to avoid contention. | |
| 274 // If we have: | |
| 275 // n collection set regions | |
| 276 // p threads | |
| 277 // Then thread t will start at region t * floor (n/p) | |
| 278 | |
| 279 HeapRegion* HRInto_G1RemSet::calculateStartRegion(int worker_i) { | |
| 280 HeapRegion* result = _g1p->collection_set(); | |
| 281 if (ParallelGCThreads > 0) { | |
| 282 size_t cs_size = _g1p->collection_set_size(); | |
| 283 int n_workers = _g1->workers()->total_workers(); | |
| 284 size_t cs_spans = cs_size / n_workers; | |
| 285 size_t ind = cs_spans * worker_i; | |
| 286 for (size_t i = 0; i < ind; i++) | |
| 287 result = result->next_in_collection_set(); | |
| 288 } | |
| 289 return result; | |
| 290 } | |
| 291 | |
| 292 void HRInto_G1RemSet::scanRS(OopsInHeapRegionClosure* oc, int worker_i) { | |
| 293 double rs_time_start = os::elapsedTime(); | |
| 294 HeapRegion *startRegion = calculateStartRegion(worker_i); | |
| 295 | |
| 1261 | 296 ScanRSClosure scanRScl(oc, worker_i); |
| 342 | 297 _g1->collection_set_iterate_from(startRegion, &scanRScl); |
| 298 scanRScl.set_try_claimed(); | |
| 299 _g1->collection_set_iterate_from(startRegion, &scanRScl); | |
| 300 | |
| 1261 | 301 double scan_rs_time_sec = os::elapsedTime() - rs_time_start; |
| 342 | 302 |
| 303 assert( _cards_scanned != NULL, "invariant" ); | |
| 304 _cards_scanned[worker_i] = scanRScl.cards_done(); | |
| 305 | |
| 306 _g1p->record_scan_rs_start_time(worker_i, rs_time_start * 1000.0); | |
| 307 _g1p->record_scan_rs_time(worker_i, scan_rs_time_sec * 1000.0); | |
| 308 } | |
| 309 | |
| 310 void HRInto_G1RemSet::updateRS(int worker_i) { | |
| 311 ConcurrentG1Refine* cg1r = _g1->concurrent_g1_refine(); | |
| 312 | |
| 313 double start = os::elapsedTime(); | |
| 314 _g1p->record_update_rs_start_time(worker_i, start * 1000.0); | |
| 315 | |
| 794 | 316 // Apply the appropriate closure to all remaining log entries. |
| 317 _g1->iterate_dirty_card_closure(false, worker_i); | |
| 318 // Now there should be no dirty cards. | |
| 319 if (G1RSLogCheckCardTable) { | |
| 320 CountNonCleanMemRegionClosure cl(_g1); | |
| 321 _ct_bs->mod_card_iterate(&cl); | |
| 322 // XXX This isn't true any more: keeping cards of young regions | |
| 323 // marked dirty broke it. Need some reasonable fix. | |
| 324 guarantee(cl.n() == 0, "Card table should be clean."); | |
| 342 | 325 } |
| 794 | 326 |
| 342 | 327 _g1p->record_update_rs_time(worker_i, (os::elapsedTime() - start) * 1000.0); |
| 328 } | |
| 329 | |
| 330 #ifndef PRODUCT | |
| 331 class PrintRSClosure : public HeapRegionClosure { | |
| 332 int _count; | |
| 333 public: | |
| 334 PrintRSClosure() : _count(0) {} | |
| 335 bool doHeapRegion(HeapRegion* r) { | |
| 336 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 337 _count += (int) hrrs->occupied(); | |
| 338 if (hrrs->occupied() == 0) { | |
| 339 gclog_or_tty->print("Heap Region [" PTR_FORMAT ", " PTR_FORMAT ") " | |
| 340 "has no remset entries\n", | |
| 341 r->bottom(), r->end()); | |
| 342 } else { | |
| 343 gclog_or_tty->print("Printing rem set for heap region [" PTR_FORMAT ", " PTR_FORMAT ")\n", | |
| 344 r->bottom(), r->end()); | |
| 345 r->print(); | |
| 346 hrrs->print(); | |
| 347 gclog_or_tty->print("\nDone printing rem set\n"); | |
| 348 } | |
| 349 return false; | |
| 350 } | |
| 351 int occupied() {return _count;} | |
| 352 }; | |
| 353 #endif | |
| 354 | |
| 355 class CountRSSizeClosure: public HeapRegionClosure { | |
| 356 size_t _n; | |
| 357 size_t _tot; | |
| 358 size_t _max; | |
| 359 HeapRegion* _max_r; | |
| 360 enum { | |
| 361 N = 20, | |
| 362 MIN = 6 | |
| 363 }; | |
| 364 int _histo[N]; | |
| 365 public: | |
| 366 CountRSSizeClosure() : _n(0), _tot(0), _max(0), _max_r(NULL) { | |
| 367 for (int i = 0; i < N; i++) _histo[i] = 0; | |
| 368 } | |
| 369 bool doHeapRegion(HeapRegion* r) { | |
| 370 if (!r->continuesHumongous()) { | |
| 371 size_t occ = r->rem_set()->occupied(); | |
| 372 _n++; | |
| 373 _tot += occ; | |
| 374 if (occ > _max) { | |
| 375 _max = occ; | |
| 376 _max_r = r; | |
| 377 } | |
| 378 // Fit it into a histo bin. | |
| 379 int s = 1 << MIN; | |
| 380 int i = 0; | |
| 381 while (occ > (size_t) s && i < (N-1)) { | |
| 382 s = s << 1; | |
| 383 i++; | |
| 384 } | |
| 385 _histo[i]++; | |
| 386 } | |
| 387 return false; | |
| 388 } | |
| 389 size_t n() { return _n; } | |
| 390 size_t tot() { return _tot; } | |
| 391 size_t mx() { return _max; } | |
| 392 HeapRegion* mxr() { return _max_r; } | |
| 393 void print_histo() { | |
| 394 int mx = N; | |
| 395 while (mx >= 0) { | |
| 396 if (_histo[mx-1] > 0) break; | |
| 397 mx--; | |
| 398 } | |
| 399 gclog_or_tty->print_cr("Number of regions with given RS sizes:"); | |
| 400 gclog_or_tty->print_cr(" <= %8d %8d", 1 << MIN, _histo[0]); | |
| 401 for (int i = 1; i < mx-1; i++) { | |
| 402 gclog_or_tty->print_cr(" %8d - %8d %8d", | |
| 403 (1 << (MIN + i - 1)) + 1, | |
| 404 1 << (MIN + i), | |
| 405 _histo[i]); | |
| 406 } | |
| 407 gclog_or_tty->print_cr(" > %8d %8d", (1 << (MIN+mx-2))+1, _histo[mx-1]); | |
| 408 } | |
| 409 }; | |
| 410 | |
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411 template <class T> void |
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412 HRInto_G1RemSet::scanNewRefsRS_work(OopsInHeapRegionClosure* oc, |
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413 int worker_i) { |
| 342 | 414 double scan_new_refs_start_sec = os::elapsedTime(); |
| 415 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 416 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (g1h->barrier_set()); | |
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417 for (int i = 0; i < _new_refs[worker_i]->length(); i++) { |
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418 T* p = (T*) _new_refs[worker_i]->at(i); |
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419 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 420 // *p was in the collection set when p was pushed on "_new_refs", but |
| 421 // another thread may have processed this location from an RS, so it | |
| 422 // might not point into the CS any longer. If so, it's obviously been | |
| 423 // processed, and we don't need to do anything further. | |
| 424 if (g1h->obj_in_cs(obj)) { | |
| 425 HeapRegion* r = g1h->heap_region_containing(p); | |
| 426 | |
| 427 DEBUG_ONLY(HeapRegion* to = g1h->heap_region_containing(obj)); | |
| 428 oc->set_region(r); | |
| 429 // If "p" has already been processed concurrently, this is | |
| 430 // idempotent. | |
| 431 oc->do_oop(p); | |
| 432 } | |
| 433 } | |
| 1261 | 434 double scan_new_refs_time_ms = (os::elapsedTime() - scan_new_refs_start_sec) * 1000.0; |
| 435 _g1p->record_scan_new_refs_time(worker_i, scan_new_refs_time_ms); | |
| 342 | 436 } |
| 437 | |
| 438 void HRInto_G1RemSet::cleanupHRRS() { | |
| 439 HeapRegionRemSet::cleanup(); | |
| 440 } | |
| 441 | |
| 442 void | |
| 443 HRInto_G1RemSet::oops_into_collection_set_do(OopsInHeapRegionClosure* oc, | |
| 444 int worker_i) { | |
| 445 #if CARD_REPEAT_HISTO | |
| 446 ct_freq_update_histo_and_reset(); | |
| 447 #endif | |
| 448 if (worker_i == 0) { | |
| 449 _cg1r->clear_and_record_card_counts(); | |
| 450 } | |
| 451 | |
| 452 // Make this into a command-line flag... | |
| 453 if (G1RSCountHisto && (ParallelGCThreads == 0 || worker_i == 0)) { | |
| 454 CountRSSizeClosure count_cl; | |
| 455 _g1->heap_region_iterate(&count_cl); | |
| 456 gclog_or_tty->print_cr("Avg of %d RS counts is %f, max is %d, " | |
| 457 "max region is " PTR_FORMAT, | |
| 458 count_cl.n(), (float)count_cl.tot()/(float)count_cl.n(), | |
| 459 count_cl.mx(), count_cl.mxr()); | |
| 460 count_cl.print_histo(); | |
| 461 } | |
| 462 | |
| 463 if (ParallelGCThreads > 0) { | |
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464 // The two flags below were introduced temporarily to serialize |
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465 // the updating and scanning of remembered sets. There are some |
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466 // race conditions when these two operations are done in parallel |
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467 // and they are causing failures. When we resolve said race |
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468 // conditions, we'll revert back to parallel remembered set |
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469 // updating and scanning. See CRs 6677707 and 6677708. |
| 1282 | 470 if (G1UseParallelRSetUpdating || (worker_i == 0)) { |
| 342 | 471 updateRS(worker_i); |
| 472 scanNewRefsRS(oc, worker_i); | |
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473 } else { |
| 794 | 474 _g1p->record_update_rs_start_time(worker_i, os::elapsedTime() * 1000.0); |
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475 _g1p->record_update_rs_processed_buffers(worker_i, 0.0); |
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476 _g1p->record_update_rs_time(worker_i, 0.0); |
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477 _g1p->record_scan_new_refs_time(worker_i, 0.0); |
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478 } |
| 1282 | 479 if (G1UseParallelRSetScanning || (worker_i == 0)) { |
| 342 | 480 scanRS(oc, worker_i); |
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481 } else { |
| 794 | 482 _g1p->record_scan_rs_start_time(worker_i, os::elapsedTime() * 1000.0); |
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483 _g1p->record_scan_rs_time(worker_i, 0.0); |
| 342 | 484 } |
| 485 } else { | |
| 486 assert(worker_i == 0, "invariant"); | |
| 487 updateRS(0); | |
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488 scanNewRefsRS(oc, 0); |
| 342 | 489 scanRS(oc, 0); |
| 490 } | |
| 491 } | |
| 492 | |
| 493 void HRInto_G1RemSet:: | |
| 494 prepare_for_oops_into_collection_set_do() { | |
| 495 #if G1_REM_SET_LOGGING | |
| 496 PrintRSClosure cl; | |
| 497 _g1->collection_set_iterate(&cl); | |
| 498 #endif | |
| 499 cleanupHRRS(); | |
| 500 ConcurrentG1Refine* cg1r = _g1->concurrent_g1_refine(); | |
| 501 _g1->set_refine_cte_cl_concurrency(false); | |
| 502 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 503 dcqs.concatenate_logs(); | |
| 504 | |
| 505 assert(!_par_traversal_in_progress, "Invariant between iterations."); | |
| 506 if (ParallelGCThreads > 0) { | |
| 507 set_par_traversal(true); | |
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508 _seq_task->set_par_threads((int)n_workers()); |
| 342 | 509 } |
| 510 guarantee( _cards_scanned == NULL, "invariant" ); | |
| 511 _cards_scanned = NEW_C_HEAP_ARRAY(size_t, n_workers()); | |
| 545 | 512 for (uint i = 0; i < n_workers(); ++i) { |
| 513 _cards_scanned[i] = 0; | |
| 514 } | |
| 342 | 515 _total_cards_scanned = 0; |
| 516 } | |
| 517 | |
| 518 | |
| 519 class cleanUpIteratorsClosure : public HeapRegionClosure { | |
| 520 bool doHeapRegion(HeapRegion *r) { | |
| 521 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 522 hrrs->init_for_par_iteration(); | |
| 523 return false; | |
| 524 } | |
| 525 }; | |
| 526 | |
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527 class UpdateRSetOopsIntoCSImmediate : public OopClosure { |
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528 G1CollectedHeap* _g1; |
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529 public: |
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530 UpdateRSetOopsIntoCSImmediate(G1CollectedHeap* g1) : _g1(g1) { } |
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531 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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532 virtual void do_oop( oop* p) { do_oop_work(p); } |
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533 template <class T> void do_oop_work(T* p) { |
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534 HeapRegion* to = _g1->heap_region_containing(oopDesc::load_decode_heap_oop(p)); |
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535 if (to->in_collection_set()) { |
| 677 | 536 to->rem_set()->add_reference(p, 0); |
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537 } |
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538 } |
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539 }; |
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540 |
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541 class UpdateRSetOopsIntoCSDeferred : public OopClosure { |
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542 G1CollectedHeap* _g1; |
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543 CardTableModRefBS* _ct_bs; |
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544 DirtyCardQueue* _dcq; |
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545 public: |
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546 UpdateRSetOopsIntoCSDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
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547 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) { } |
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548 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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549 virtual void do_oop( oop* p) { do_oop_work(p); } |
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550 template <class T> void do_oop_work(T* p) { |
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551 oop obj = oopDesc::load_decode_heap_oop(p); |
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552 if (_g1->obj_in_cs(obj)) { |
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553 size_t card_index = _ct_bs->index_for(p); |
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554 if (_ct_bs->mark_card_deferred(card_index)) { |
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555 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
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556 } |
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557 } |
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558 } |
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559 }; |
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560 |
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561 template <class T> void HRInto_G1RemSet::new_refs_iterate_work(OopClosure* cl) { |
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562 for (size_t i = 0; i < n_workers(); i++) { |
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563 for (int j = 0; j < _new_refs[i]->length(); j++) { |
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564 T* p = (T*) _new_refs[i]->at(j); |
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565 cl->do_oop(p); |
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566 } |
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567 } |
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568 } |
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569 |
| 342 | 570 void HRInto_G1RemSet::cleanup_after_oops_into_collection_set_do() { |
| 571 guarantee( _cards_scanned != NULL, "invariant" ); | |
| 572 _total_cards_scanned = 0; | |
| 573 for (uint i = 0; i < n_workers(); ++i) | |
| 574 _total_cards_scanned += _cards_scanned[i]; | |
| 575 FREE_C_HEAP_ARRAY(size_t, _cards_scanned); | |
| 576 _cards_scanned = NULL; | |
| 577 // Cleanup after copy | |
| 578 #if G1_REM_SET_LOGGING | |
| 579 PrintRSClosure cl; | |
| 580 _g1->heap_region_iterate(&cl); | |
| 581 #endif | |
| 582 _g1->set_refine_cte_cl_concurrency(true); | |
| 583 cleanUpIteratorsClosure iterClosure; | |
| 584 _g1->collection_set_iterate(&iterClosure); | |
| 585 // Set all cards back to clean. | |
| 586 _g1->cleanUpCardTable(); | |
| 794 | 587 |
| 342 | 588 if (ParallelGCThreads > 0) { |
| 589 set_par_traversal(false); | |
| 590 } | |
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591 |
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592 if (_g1->evacuation_failed()) { |
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593 // Restore remembered sets for the regions pointing into |
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594 // the collection set. |
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595 if (G1DeferredRSUpdate) { |
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596 DirtyCardQueue dcq(&_g1->dirty_card_queue_set()); |
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597 UpdateRSetOopsIntoCSDeferred deferred_update(_g1, &dcq); |
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598 new_refs_iterate(&deferred_update); |
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599 } else { |
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600 UpdateRSetOopsIntoCSImmediate immediate_update(_g1); |
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601 new_refs_iterate(&immediate_update); |
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602 } |
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603 } |
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604 for (uint i = 0; i < n_workers(); i++) { |
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605 _new_refs[i]->clear(); |
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606 } |
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607 |
| 342 | 608 assert(!_par_traversal_in_progress, "Invariant between iterations."); |
| 609 } | |
| 610 | |
| 611 class UpdateRSObjectClosure: public ObjectClosure { | |
| 612 UpdateRSOopClosure* _update_rs_oop_cl; | |
| 613 public: | |
| 614 UpdateRSObjectClosure(UpdateRSOopClosure* update_rs_oop_cl) : | |
| 615 _update_rs_oop_cl(update_rs_oop_cl) {} | |
| 616 void do_object(oop obj) { | |
| 617 obj->oop_iterate(_update_rs_oop_cl); | |
| 618 } | |
| 619 | |
| 620 }; | |
| 621 | |
| 622 class ScrubRSClosure: public HeapRegionClosure { | |
| 623 G1CollectedHeap* _g1h; | |
| 624 BitMap* _region_bm; | |
| 625 BitMap* _card_bm; | |
| 626 CardTableModRefBS* _ctbs; | |
| 627 public: | |
| 628 ScrubRSClosure(BitMap* region_bm, BitMap* card_bm) : | |
| 629 _g1h(G1CollectedHeap::heap()), | |
| 630 _region_bm(region_bm), _card_bm(card_bm), | |
| 631 _ctbs(NULL) | |
| 632 { | |
| 633 ModRefBarrierSet* bs = _g1h->mr_bs(); | |
| 634 guarantee(bs->is_a(BarrierSet::CardTableModRef), "Precondition"); | |
| 635 _ctbs = (CardTableModRefBS*)bs; | |
| 636 } | |
| 637 | |
| 638 bool doHeapRegion(HeapRegion* r) { | |
| 639 if (!r->continuesHumongous()) { | |
| 640 r->rem_set()->scrub(_ctbs, _region_bm, _card_bm); | |
| 641 } | |
| 642 return false; | |
| 643 } | |
| 644 }; | |
| 645 | |
| 646 void HRInto_G1RemSet::scrub(BitMap* region_bm, BitMap* card_bm) { | |
| 647 ScrubRSClosure scrub_cl(region_bm, card_bm); | |
| 648 _g1->heap_region_iterate(&scrub_cl); | |
| 649 } | |
| 650 | |
| 651 void HRInto_G1RemSet::scrub_par(BitMap* region_bm, BitMap* card_bm, | |
| 652 int worker_num, int claim_val) { | |
| 653 ScrubRSClosure scrub_cl(region_bm, card_bm); | |
| 654 _g1->heap_region_par_iterate_chunked(&scrub_cl, worker_num, claim_val); | |
| 655 } | |
| 656 | |
| 657 | |
| 658 static IntHistogram out_of_histo(50, 50); | |
| 659 | |
|
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660 void HRInto_G1RemSet::concurrentRefineOneCard_impl(jbyte* card_ptr, int worker_i) { |
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661 // Construct the region representing the card. |
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662 HeapWord* start = _ct_bs->addr_for(card_ptr); |
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663 // And find the region containing it. |
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664 HeapRegion* r = _g1->heap_region_containing(start); |
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665 assert(r != NULL, "unexpected null"); |
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666 |
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667 HeapWord* end = _ct_bs->addr_for(card_ptr + 1); |
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668 MemRegion dirtyRegion(start, end); |
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669 |
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670 #if CARD_REPEAT_HISTO |
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671 init_ct_freq_table(_g1->g1_reserved_obj_bytes()); |
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672 ct_freq_note_card(_ct_bs->index_for(start)); |
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673 #endif |
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674 |
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675 UpdateRSOopClosure update_rs_oop_cl(this, worker_i); |
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676 update_rs_oop_cl.set_from(r); |
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677 FilterOutOfRegionClosure filter_then_update_rs_oop_cl(r, &update_rs_oop_cl); |
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678 |
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679 // Undirty the card. |
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680 *card_ptr = CardTableModRefBS::clean_card_val(); |
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681 // We must complete this write before we do any of the reads below. |
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682 OrderAccess::storeload(); |
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683 // And process it, being careful of unallocated portions of TLAB's. |
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684 HeapWord* stop_point = |
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685 r->oops_on_card_seq_iterate_careful(dirtyRegion, |
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686 &filter_then_update_rs_oop_cl); |
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687 // If stop_point is non-null, then we encountered an unallocated region |
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688 // (perhaps the unfilled portion of a TLAB.) For now, we'll dirty the |
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689 // card and re-enqueue: if we put off the card until a GC pause, then the |
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690 // unallocated portion will be filled in. Alternatively, we might try |
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691 // the full complexity of the technique used in "regular" precleaning. |
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692 if (stop_point != NULL) { |
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693 // The card might have gotten re-dirtied and re-enqueued while we |
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694 // worked. (In fact, it's pretty likely.) |
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695 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
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696 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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697 MutexLockerEx x(Shared_DirtyCardQ_lock, |
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698 Mutex::_no_safepoint_check_flag); |
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699 DirtyCardQueue* sdcq = |
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700 JavaThread::dirty_card_queue_set().shared_dirty_card_queue(); |
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701 sdcq->enqueue(card_ptr); |
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702 } |
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703 } else { |
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704 out_of_histo.add_entry(filter_then_update_rs_oop_cl.out_of_region()); |
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705 _conc_refine_cards++; |
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706 } |
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707 } |
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708 |
| 342 | 709 void HRInto_G1RemSet::concurrentRefineOneCard(jbyte* card_ptr, int worker_i) { |
| 710 // If the card is no longer dirty, nothing to do. | |
| 711 if (*card_ptr != CardTableModRefBS::dirty_card_val()) return; | |
| 712 | |
| 713 // Construct the region representing the card. | |
| 714 HeapWord* start = _ct_bs->addr_for(card_ptr); | |
| 715 // And find the region containing it. | |
| 716 HeapRegion* r = _g1->heap_region_containing(start); | |
| 717 if (r == NULL) { | |
| 718 guarantee(_g1->is_in_permanent(start), "Or else where?"); | |
| 719 return; // Not in the G1 heap (might be in perm, for example.) | |
| 720 } | |
| 721 // Why do we have to check here whether a card is on a young region, | |
| 722 // given that we dirty young regions and, as a result, the | |
| 723 // post-barrier is supposed to filter them out and never to enqueue | |
| 724 // them? When we allocate a new region as the "allocation region" we | |
| 725 // actually dirty its cards after we release the lock, since card | |
| 726 // dirtying while holding the lock was a performance bottleneck. So, | |
| 727 // as a result, it is possible for other threads to actually | |
| 728 // allocate objects in the region (after the acquire the lock) | |
| 729 // before all the cards on the region are dirtied. This is unlikely, | |
| 730 // and it doesn't happen often, but it can happen. So, the extra | |
| 731 // check below filters out those cards. | |
|
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732 if (r->is_young()) { |
| 342 | 733 return; |
| 734 } | |
| 735 // While we are processing RSet buffers during the collection, we | |
| 736 // actually don't want to scan any cards on the collection set, | |
| 737 // since we don't want to update remebered sets with entries that | |
| 738 // point into the collection set, given that live objects from the | |
| 739 // collection set are about to move and such entries will be stale | |
| 740 // very soon. This change also deals with a reliability issue which | |
| 741 // involves scanning a card in the collection set and coming across | |
| 742 // an array that was being chunked and looking malformed. Note, | |
| 743 // however, that if evacuation fails, we have to scan any objects | |
| 744 // that were not moved and create any missing entries. | |
| 745 if (r->in_collection_set()) { | |
| 746 return; | |
| 747 } | |
| 748 | |
|
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749 // Should we defer processing the card? |
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750 // |
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751 // Previously the result from the insert_cache call would be |
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752 // either card_ptr (implying that card_ptr was currently "cold"), |
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753 // null (meaning we had inserted the card ptr into the "hot" |
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754 // cache, which had some headroom), or a "hot" card ptr |
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755 // extracted from the "hot" cache. |
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756 // |
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757 // Now that the _card_counts cache in the ConcurrentG1Refine |
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758 // instance is an evicting hash table, the result we get back |
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759 // could be from evicting the card ptr in an already occupied |
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760 // bucket (in which case we have replaced the card ptr in the |
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761 // bucket with card_ptr and "defer" is set to false). To avoid |
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762 // having a data structure (updates to which would need a lock) |
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763 // to hold these unprocessed dirty cards, we need to immediately |
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764 // process card_ptr. The actions needed to be taken on return |
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765 // from cache_insert are summarized in the following table: |
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766 // |
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767 // res defer action |
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768 // -------------------------------------------------------------- |
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769 // null false card evicted from _card_counts & replaced with |
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770 // card_ptr; evicted ptr added to hot cache. |
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771 // No need to process res; immediately process card_ptr |
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772 // |
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773 // null true card not evicted from _card_counts; card_ptr added |
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774 // to hot cache. |
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775 // Nothing to do. |
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776 // |
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777 // non-null false card evicted from _card_counts & replaced with |
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778 // card_ptr; evicted ptr is currently "cold" or |
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779 // caused an eviction from the hot cache. |
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780 // Immediately process res; process card_ptr. |
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781 // |
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782 // non-null true card not evicted from _card_counts; card_ptr is |
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783 // currently cold, or caused an eviction from hot |
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784 // cache. |
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785 // Immediately process res; no need to process card_ptr. |
| 342 | 786 |
|
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787 jbyte* res = card_ptr; |
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788 bool defer = false; |
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789 if (_cg1r->use_cache()) { |
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790 jbyte* res = _cg1r->cache_insert(card_ptr, &defer); |
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791 if (res != NULL && (res != card_ptr || defer)) { |
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792 start = _ct_bs->addr_for(res); |
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793 r = _g1->heap_region_containing(start); |
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794 if (r == NULL) { |
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795 assert(_g1->is_in_permanent(start), "Or else where?"); |
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796 } else { |
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797 guarantee(!r->is_young(), "It was evicted in the current minor cycle."); |
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798 // Process card pointer we get back from the hot card cache |
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799 concurrentRefineOneCard_impl(res, worker_i); |
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800 } |
| 342 | 801 } |
| 802 } | |
| 803 | |
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804 if (!defer) { |
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805 concurrentRefineOneCard_impl(card_ptr, worker_i); |
| 342 | 806 } |
| 807 } | |
| 808 | |
| 809 class HRRSStatsIter: public HeapRegionClosure { | |
| 810 size_t _occupied; | |
| 811 size_t _total_mem_sz; | |
| 812 size_t _max_mem_sz; | |
| 813 HeapRegion* _max_mem_sz_region; | |
| 814 public: | |
| 815 HRRSStatsIter() : | |
| 816 _occupied(0), | |
| 817 _total_mem_sz(0), | |
| 818 _max_mem_sz(0), | |
| 819 _max_mem_sz_region(NULL) | |
| 820 {} | |
| 821 | |
| 822 bool doHeapRegion(HeapRegion* r) { | |
| 823 if (r->continuesHumongous()) return false; | |
| 824 size_t mem_sz = r->rem_set()->mem_size(); | |
| 825 if (mem_sz > _max_mem_sz) { | |
| 826 _max_mem_sz = mem_sz; | |
| 827 _max_mem_sz_region = r; | |
| 828 } | |
| 829 _total_mem_sz += mem_sz; | |
| 830 size_t occ = r->rem_set()->occupied(); | |
| 831 _occupied += occ; | |
| 832 return false; | |
| 833 } | |
| 834 size_t total_mem_sz() { return _total_mem_sz; } | |
| 835 size_t max_mem_sz() { return _max_mem_sz; } | |
| 836 size_t occupied() { return _occupied; } | |
| 837 HeapRegion* max_mem_sz_region() { return _max_mem_sz_region; } | |
| 838 }; | |
| 839 | |
| 794 | 840 class PrintRSThreadVTimeClosure : public ThreadClosure { |
| 841 public: | |
| 842 virtual void do_thread(Thread *t) { | |
| 843 ConcurrentG1RefineThread* crt = (ConcurrentG1RefineThread*) t; | |
| 844 gclog_or_tty->print(" %5.2f", crt->vtime_accum()); | |
| 845 } | |
| 846 }; | |
| 847 | |
| 342 | 848 void HRInto_G1RemSet::print_summary_info() { |
| 849 G1CollectedHeap* g1 = G1CollectedHeap::heap(); | |
| 850 | |
| 851 #if CARD_REPEAT_HISTO | |
| 852 gclog_or_tty->print_cr("\nG1 card_repeat count histogram: "); | |
| 853 gclog_or_tty->print_cr(" # of repeats --> # of cards with that number."); | |
| 854 card_repeat_count.print_on(gclog_or_tty); | |
| 855 #endif | |
| 856 | |
| 857 if (FILTEROUTOFREGIONCLOSURE_DOHISTOGRAMCOUNT) { | |
| 858 gclog_or_tty->print_cr("\nG1 rem-set out-of-region histogram: "); | |
| 859 gclog_or_tty->print_cr(" # of CS ptrs --> # of cards with that number."); | |
| 860 out_of_histo.print_on(gclog_or_tty); | |
| 861 } | |
| 794 | 862 gclog_or_tty->print_cr("\n Concurrent RS processed %d cards", |
| 863 _conc_refine_cards); | |
| 342 | 864 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 865 jint tot_processed_buffers = | |
| 866 dcqs.processed_buffers_mut() + dcqs.processed_buffers_rs_thread(); | |
| 867 gclog_or_tty->print_cr(" Of %d completed buffers:", tot_processed_buffers); | |
| 794 | 868 gclog_or_tty->print_cr(" %8d (%5.1f%%) by conc RS threads.", |
| 342 | 869 dcqs.processed_buffers_rs_thread(), |
| 870 100.0*(float)dcqs.processed_buffers_rs_thread()/ | |
| 871 (float)tot_processed_buffers); | |
| 872 gclog_or_tty->print_cr(" %8d (%5.1f%%) by mutator threads.", | |
| 873 dcqs.processed_buffers_mut(), | |
| 874 100.0*(float)dcqs.processed_buffers_mut()/ | |
| 875 (float)tot_processed_buffers); | |
| 794 | 876 gclog_or_tty->print_cr(" Conc RS threads times(s)"); |
| 877 PrintRSThreadVTimeClosure p; | |
| 878 gclog_or_tty->print(" "); | |
| 879 g1->concurrent_g1_refine()->threads_do(&p); | |
| 342 | 880 gclog_or_tty->print_cr(""); |
| 794 | 881 |
| 342 | 882 if (G1UseHRIntoRS) { |
| 883 HRRSStatsIter blk; | |
| 884 g1->heap_region_iterate(&blk); | |
| 885 gclog_or_tty->print_cr(" Total heap region rem set sizes = " SIZE_FORMAT "K." | |
| 886 " Max = " SIZE_FORMAT "K.", | |
| 887 blk.total_mem_sz()/K, blk.max_mem_sz()/K); | |
| 888 gclog_or_tty->print_cr(" Static structures = " SIZE_FORMAT "K," | |
| 889 " free_lists = " SIZE_FORMAT "K.", | |
| 890 HeapRegionRemSet::static_mem_size()/K, | |
| 891 HeapRegionRemSet::fl_mem_size()/K); | |
| 892 gclog_or_tty->print_cr(" %d occupied cards represented.", | |
| 893 blk.occupied()); | |
| 894 gclog_or_tty->print_cr(" Max sz region = [" PTR_FORMAT ", " PTR_FORMAT " )" | |
| 677 | 895 ", cap = " SIZE_FORMAT "K, occ = " SIZE_FORMAT "K.", |
| 342 | 896 blk.max_mem_sz_region()->bottom(), blk.max_mem_sz_region()->end(), |
| 897 (blk.max_mem_sz_region()->rem_set()->mem_size() + K - 1)/K, | |
| 898 (blk.max_mem_sz_region()->rem_set()->occupied() + K - 1)/K); | |
| 899 gclog_or_tty->print_cr(" Did %d coarsenings.", | |
| 900 HeapRegionRemSet::n_coarsenings()); | |
| 901 | |
| 902 } | |
| 903 } | |
| 904 void HRInto_G1RemSet::prepare_for_verify() { | |
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905 if (G1HRRSFlushLogBuffersOnVerify && |
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906 (VerifyBeforeGC || VerifyAfterGC) |
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907 && !_g1->full_collection()) { |
| 342 | 908 cleanupHRRS(); |
| 909 _g1->set_refine_cte_cl_concurrency(false); | |
| 910 if (SafepointSynchronize::is_at_safepoint()) { | |
| 911 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 912 dcqs.concatenate_logs(); | |
| 913 } | |
| 914 bool cg1r_use_cache = _cg1r->use_cache(); | |
| 915 _cg1r->set_use_cache(false); | |
| 916 updateRS(0); | |
| 917 _cg1r->set_use_cache(cg1r_use_cache); | |
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918 |
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919 assert(JavaThread::dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
| 342 | 920 } |
| 921 } |