Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1RemSet.cpp @ 845:df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
Summary: Modifications to G1 so as to allow the use of compressed oops.
Reviewed-by: apetrusenko, coleenp, jmasa, kvn, never, phh, tonyp
| author | ysr |
|---|---|
| date | Tue, 14 Jul 2009 15:40:39 -0700 |
| parents | 29e7d79232b9 |
| children | 6cb8e9df7174 |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 579 | 2 * Copyright 2001-2009 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 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; | |
| 158 bool _try_claimed; | |
| 747 | 159 size_t _min_skip_distance, _max_skip_distance; |
| 342 | 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()); | |
| 747 | 171 _min_skip_distance = 16; |
| 172 _max_skip_distance = 2 * _g1h->n_par_threads() * _min_skip_distance; | |
| 342 | 173 } |
| 174 | |
| 175 void set_try_claimed() { _try_claimed = true; } | |
| 176 | |
| 177 void scanCard(size_t index, HeapRegion *r) { | |
| 178 _cards_done++; | |
| 179 DirtyCardToOopClosure* cl = | |
| 180 r->new_dcto_closure(_oc, | |
| 181 CardTableModRefBS::Precise, | |
| 182 HeapRegionDCTOC::IntoCSFilterKind); | |
| 183 | |
| 184 // Set the "from" region in the closure. | |
| 185 _oc->set_region(r); | |
| 186 HeapWord* card_start = _bot_shared->address_for_index(index); | |
| 187 HeapWord* card_end = card_start + G1BlockOffsetSharedArray::N_words; | |
| 188 Space *sp = SharedHeap::heap()->space_containing(card_start); | |
| 189 MemRegion sm_region; | |
| 190 if (ParallelGCThreads > 0) { | |
| 191 // first find the used area | |
| 192 sm_region = sp->used_region_at_save_marks(); | |
| 193 } else { | |
| 194 // The closure is not idempotent. We shouldn't look at objects | |
| 195 // allocated during the GC. | |
| 196 sm_region = sp->used_region_at_save_marks(); | |
| 197 } | |
| 198 MemRegion mr = sm_region.intersection(MemRegion(card_start,card_end)); | |
| 199 if (!mr.is_empty()) { | |
| 200 cl->do_MemRegion(mr); | |
| 201 } | |
| 202 } | |
| 203 | |
| 204 void printCard(HeapRegion* card_region, size_t card_index, | |
| 205 HeapWord* card_start) { | |
| 206 gclog_or_tty->print_cr("T %d Region [" PTR_FORMAT ", " PTR_FORMAT ") " | |
| 207 "RS names card %p: " | |
| 208 "[" PTR_FORMAT ", " PTR_FORMAT ")", | |
| 209 _worker_i, | |
| 210 card_region->bottom(), card_region->end(), | |
| 211 card_index, | |
| 212 card_start, card_start + G1BlockOffsetSharedArray::N_words); | |
| 213 } | |
| 214 | |
| 215 bool doHeapRegion(HeapRegion* r) { | |
| 216 assert(r->in_collection_set(), "should only be called on elements of CS."); | |
| 217 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 218 if (hrrs->iter_is_complete()) return false; // All done. | |
| 219 if (!_try_claimed && !hrrs->claim_iter()) return false; | |
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220 _g1h->push_dirty_cards_region(r); |
| 342 | 221 // If we didn't return above, then |
| 222 // _try_claimed || r->claim_iter() | |
| 223 // is true: either we're supposed to work on claimed-but-not-complete | |
| 224 // regions, or we successfully claimed the region. | |
| 225 HeapRegionRemSetIterator* iter = _g1h->rem_set_iterator(_worker_i); | |
| 226 hrrs->init_iterator(iter); | |
| 227 size_t card_index; | |
| 747 | 228 size_t skip_distance = 0, current_card = 0, jump_to_card = 0; |
| 342 | 229 while (iter->has_next(card_index)) { |
| 747 | 230 if (current_card < jump_to_card) { |
| 231 ++current_card; | |
| 232 continue; | |
| 233 } | |
| 342 | 234 HeapWord* card_start = _g1h->bot_shared()->address_for_index(card_index); |
| 235 #if 0 | |
| 236 gclog_or_tty->print("Rem set iteration yielded card [" PTR_FORMAT ", " PTR_FORMAT ").\n", | |
| 237 card_start, card_start + CardTableModRefBS::card_size_in_words); | |
| 238 #endif | |
| 239 | |
| 240 HeapRegion* card_region = _g1h->heap_region_containing(card_start); | |
| 241 assert(card_region != NULL, "Yielding cards not in the heap?"); | |
| 242 _cards++; | |
| 243 | |
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244 if (!card_region->is_on_dirty_cards_region_list()) { |
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245 _g1h->push_dirty_cards_region(card_region); |
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246 } |
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247 |
| 747 | 248 // If the card is dirty, then we will scan it during updateRS. |
| 249 if (!card_region->in_collection_set() && !_ct_bs->is_card_dirty(card_index)) { | |
| 250 if (!_ct_bs->is_card_claimed(card_index) && _ct_bs->claim_card(card_index)) { | |
| 342 | 251 scanCard(card_index, card_region); |
| 747 | 252 } else if (_try_claimed) { |
| 253 if (jump_to_card == 0 || jump_to_card != current_card) { | |
| 254 // We did some useful work in the previous iteration. | |
| 255 // Decrease the distance. | |
| 256 skip_distance = MAX2(skip_distance >> 1, _min_skip_distance); | |
| 257 } else { | |
| 258 // Previous iteration resulted in a claim failure. | |
| 259 // Increase the distance. | |
| 260 skip_distance = MIN2(skip_distance << 1, _max_skip_distance); | |
| 261 } | |
| 262 jump_to_card = current_card + skip_distance; | |
| 263 } | |
| 342 | 264 } |
| 747 | 265 ++current_card; |
| 342 | 266 } |
| 747 | 267 if (!_try_claimed) { |
| 268 hrrs->set_iter_complete(); | |
| 269 } | |
| 342 | 270 return false; |
| 271 } | |
| 272 // Set all cards back to clean. | |
| 273 void cleanup() {_g1h->cleanUpCardTable();} | |
| 274 size_t cards_done() { return _cards_done;} | |
| 275 size_t cards_looked_up() { return _cards;} | |
| 276 }; | |
| 277 | |
| 278 // We want the parallel threads to start their scanning at | |
| 279 // different collection set regions to avoid contention. | |
| 280 // If we have: | |
| 281 // n collection set regions | |
| 282 // p threads | |
| 283 // Then thread t will start at region t * floor (n/p) | |
| 284 | |
| 285 HeapRegion* HRInto_G1RemSet::calculateStartRegion(int worker_i) { | |
| 286 HeapRegion* result = _g1p->collection_set(); | |
| 287 if (ParallelGCThreads > 0) { | |
| 288 size_t cs_size = _g1p->collection_set_size(); | |
| 289 int n_workers = _g1->workers()->total_workers(); | |
| 290 size_t cs_spans = cs_size / n_workers; | |
| 291 size_t ind = cs_spans * worker_i; | |
| 292 for (size_t i = 0; i < ind; i++) | |
| 293 result = result->next_in_collection_set(); | |
| 294 } | |
| 295 return result; | |
| 296 } | |
| 297 | |
| 298 void HRInto_G1RemSet::scanRS(OopsInHeapRegionClosure* oc, int worker_i) { | |
| 299 double rs_time_start = os::elapsedTime(); | |
| 300 HeapRegion *startRegion = calculateStartRegion(worker_i); | |
| 301 | |
| 302 BufferingOopsInHeapRegionClosure boc(oc); | |
| 303 ScanRSClosure scanRScl(&boc, worker_i); | |
| 304 _g1->collection_set_iterate_from(startRegion, &scanRScl); | |
| 305 scanRScl.set_try_claimed(); | |
| 306 _g1->collection_set_iterate_from(startRegion, &scanRScl); | |
| 307 | |
| 308 boc.done(); | |
| 309 double closure_app_time_sec = boc.closure_app_seconds(); | |
| 310 double scan_rs_time_sec = (os::elapsedTime() - rs_time_start) - | |
| 311 closure_app_time_sec; | |
| 312 double closure_app_time_ms = closure_app_time_sec * 1000.0; | |
| 313 | |
| 314 assert( _cards_scanned != NULL, "invariant" ); | |
| 315 _cards_scanned[worker_i] = scanRScl.cards_done(); | |
| 316 | |
| 317 _g1p->record_scan_rs_start_time(worker_i, rs_time_start * 1000.0); | |
| 318 _g1p->record_scan_rs_time(worker_i, scan_rs_time_sec * 1000.0); | |
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319 |
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320 double scan_new_refs_time_ms = _g1p->get_scan_new_refs_time(worker_i); |
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321 if (scan_new_refs_time_ms > 0.0) { |
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322 closure_app_time_ms += scan_new_refs_time_ms; |
| 342 | 323 } |
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324 |
| 342 | 325 _g1p->record_obj_copy_time(worker_i, closure_app_time_ms); |
| 326 } | |
| 327 | |
| 328 void HRInto_G1RemSet::updateRS(int worker_i) { | |
| 329 ConcurrentG1Refine* cg1r = _g1->concurrent_g1_refine(); | |
| 330 | |
| 331 double start = os::elapsedTime(); | |
| 332 _g1p->record_update_rs_start_time(worker_i, start * 1000.0); | |
| 333 | |
| 794 | 334 // Apply the appropriate closure to all remaining log entries. |
| 335 _g1->iterate_dirty_card_closure(false, worker_i); | |
| 336 // Now there should be no dirty cards. | |
| 337 if (G1RSLogCheckCardTable) { | |
| 338 CountNonCleanMemRegionClosure cl(_g1); | |
| 339 _ct_bs->mod_card_iterate(&cl); | |
| 340 // XXX This isn't true any more: keeping cards of young regions | |
| 341 // marked dirty broke it. Need some reasonable fix. | |
| 342 guarantee(cl.n() == 0, "Card table should be clean."); | |
| 342 | 343 } |
| 794 | 344 |
| 342 | 345 _g1p->record_update_rs_time(worker_i, (os::elapsedTime() - start) * 1000.0); |
| 346 } | |
| 347 | |
| 348 #ifndef PRODUCT | |
| 349 class PrintRSClosure : public HeapRegionClosure { | |
| 350 int _count; | |
| 351 public: | |
| 352 PrintRSClosure() : _count(0) {} | |
| 353 bool doHeapRegion(HeapRegion* r) { | |
| 354 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 355 _count += (int) hrrs->occupied(); | |
| 356 if (hrrs->occupied() == 0) { | |
| 357 gclog_or_tty->print("Heap Region [" PTR_FORMAT ", " PTR_FORMAT ") " | |
| 358 "has no remset entries\n", | |
| 359 r->bottom(), r->end()); | |
| 360 } else { | |
| 361 gclog_or_tty->print("Printing rem set for heap region [" PTR_FORMAT ", " PTR_FORMAT ")\n", | |
| 362 r->bottom(), r->end()); | |
| 363 r->print(); | |
| 364 hrrs->print(); | |
| 365 gclog_or_tty->print("\nDone printing rem set\n"); | |
| 366 } | |
| 367 return false; | |
| 368 } | |
| 369 int occupied() {return _count;} | |
| 370 }; | |
| 371 #endif | |
| 372 | |
| 373 class CountRSSizeClosure: public HeapRegionClosure { | |
| 374 size_t _n; | |
| 375 size_t _tot; | |
| 376 size_t _max; | |
| 377 HeapRegion* _max_r; | |
| 378 enum { | |
| 379 N = 20, | |
| 380 MIN = 6 | |
| 381 }; | |
| 382 int _histo[N]; | |
| 383 public: | |
| 384 CountRSSizeClosure() : _n(0), _tot(0), _max(0), _max_r(NULL) { | |
| 385 for (int i = 0; i < N; i++) _histo[i] = 0; | |
| 386 } | |
| 387 bool doHeapRegion(HeapRegion* r) { | |
| 388 if (!r->continuesHumongous()) { | |
| 389 size_t occ = r->rem_set()->occupied(); | |
| 390 _n++; | |
| 391 _tot += occ; | |
| 392 if (occ > _max) { | |
| 393 _max = occ; | |
| 394 _max_r = r; | |
| 395 } | |
| 396 // Fit it into a histo bin. | |
| 397 int s = 1 << MIN; | |
| 398 int i = 0; | |
| 399 while (occ > (size_t) s && i < (N-1)) { | |
| 400 s = s << 1; | |
| 401 i++; | |
| 402 } | |
| 403 _histo[i]++; | |
| 404 } | |
| 405 return false; | |
| 406 } | |
| 407 size_t n() { return _n; } | |
| 408 size_t tot() { return _tot; } | |
| 409 size_t mx() { return _max; } | |
| 410 HeapRegion* mxr() { return _max_r; } | |
| 411 void print_histo() { | |
| 412 int mx = N; | |
| 413 while (mx >= 0) { | |
| 414 if (_histo[mx-1] > 0) break; | |
| 415 mx--; | |
| 416 } | |
| 417 gclog_or_tty->print_cr("Number of regions with given RS sizes:"); | |
| 418 gclog_or_tty->print_cr(" <= %8d %8d", 1 << MIN, _histo[0]); | |
| 419 for (int i = 1; i < mx-1; i++) { | |
| 420 gclog_or_tty->print_cr(" %8d - %8d %8d", | |
| 421 (1 << (MIN + i - 1)) + 1, | |
| 422 1 << (MIN + i), | |
| 423 _histo[i]); | |
| 424 } | |
| 425 gclog_or_tty->print_cr(" > %8d %8d", (1 << (MIN+mx-2))+1, _histo[mx-1]); | |
| 426 } | |
| 427 }; | |
| 428 | |
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429 template <class T> void |
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430 HRInto_G1RemSet::scanNewRefsRS_work(OopsInHeapRegionClosure* oc, |
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431 int worker_i) { |
| 342 | 432 double scan_new_refs_start_sec = os::elapsedTime(); |
| 433 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 434 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (g1h->barrier_set()); | |
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435 for (int i = 0; i < _new_refs[worker_i]->length(); i++) { |
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436 T* p = (T*) _new_refs[worker_i]->at(i); |
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437 oop obj = oopDesc::load_decode_heap_oop(p); |
| 342 | 438 // *p was in the collection set when p was pushed on "_new_refs", but |
| 439 // another thread may have processed this location from an RS, so it | |
| 440 // might not point into the CS any longer. If so, it's obviously been | |
| 441 // processed, and we don't need to do anything further. | |
| 442 if (g1h->obj_in_cs(obj)) { | |
| 443 HeapRegion* r = g1h->heap_region_containing(p); | |
| 444 | |
| 445 DEBUG_ONLY(HeapRegion* to = g1h->heap_region_containing(obj)); | |
| 446 oc->set_region(r); | |
| 447 // If "p" has already been processed concurrently, this is | |
| 448 // idempotent. | |
| 449 oc->do_oop(p); | |
| 450 } | |
| 451 } | |
| 452 _g1p->record_scan_new_refs_time(worker_i, | |
| 453 (os::elapsedTime() - scan_new_refs_start_sec) | |
| 454 * 1000.0); | |
| 455 } | |
| 456 | |
| 457 void HRInto_G1RemSet::cleanupHRRS() { | |
| 458 HeapRegionRemSet::cleanup(); | |
| 459 } | |
| 460 | |
| 461 void | |
| 462 HRInto_G1RemSet::oops_into_collection_set_do(OopsInHeapRegionClosure* oc, | |
| 463 int worker_i) { | |
| 464 #if CARD_REPEAT_HISTO | |
| 465 ct_freq_update_histo_and_reset(); | |
| 466 #endif | |
| 467 if (worker_i == 0) { | |
| 468 _cg1r->clear_and_record_card_counts(); | |
| 469 } | |
| 470 | |
| 471 // Make this into a command-line flag... | |
| 472 if (G1RSCountHisto && (ParallelGCThreads == 0 || worker_i == 0)) { | |
| 473 CountRSSizeClosure count_cl; | |
| 474 _g1->heap_region_iterate(&count_cl); | |
| 475 gclog_or_tty->print_cr("Avg of %d RS counts is %f, max is %d, " | |
| 476 "max region is " PTR_FORMAT, | |
| 477 count_cl.n(), (float)count_cl.tot()/(float)count_cl.n(), | |
| 478 count_cl.mx(), count_cl.mxr()); | |
| 479 count_cl.print_histo(); | |
| 480 } | |
| 481 | |
| 482 if (ParallelGCThreads > 0) { | |
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483 // The two flags below were introduced temporarily to serialize |
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484 // the updating and scanning of remembered sets. There are some |
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485 // race conditions when these two operations are done in parallel |
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486 // and they are causing failures. When we resolve said race |
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487 // conditions, we'll revert back to parallel remembered set |
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488 // updating and scanning. See CRs 6677707 and 6677708. |
| 751 | 489 if (G1ParallelRSetUpdatingEnabled || (worker_i == 0)) { |
| 342 | 490 updateRS(worker_i); |
| 491 scanNewRefsRS(oc, worker_i); | |
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492 } else { |
| 794 | 493 _g1p->record_update_rs_start_time(worker_i, os::elapsedTime() * 1000.0); |
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494 _g1p->record_update_rs_processed_buffers(worker_i, 0.0); |
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495 _g1p->record_update_rs_time(worker_i, 0.0); |
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496 _g1p->record_scan_new_refs_time(worker_i, 0.0); |
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497 } |
| 751 | 498 if (G1ParallelRSetScanningEnabled || (worker_i == 0)) { |
| 342 | 499 scanRS(oc, worker_i); |
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500 } else { |
| 794 | 501 _g1p->record_scan_rs_start_time(worker_i, os::elapsedTime() * 1000.0); |
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502 _g1p->record_scan_rs_time(worker_i, 0.0); |
| 342 | 503 } |
| 504 } else { | |
| 505 assert(worker_i == 0, "invariant"); | |
| 506 updateRS(0); | |
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507 scanNewRefsRS(oc, 0); |
| 342 | 508 scanRS(oc, 0); |
| 509 } | |
| 510 } | |
| 511 | |
| 512 void HRInto_G1RemSet:: | |
| 513 prepare_for_oops_into_collection_set_do() { | |
| 514 #if G1_REM_SET_LOGGING | |
| 515 PrintRSClosure cl; | |
| 516 _g1->collection_set_iterate(&cl); | |
| 517 #endif | |
| 518 cleanupHRRS(); | |
| 519 ConcurrentG1Refine* cg1r = _g1->concurrent_g1_refine(); | |
| 520 _g1->set_refine_cte_cl_concurrency(false); | |
| 521 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 522 dcqs.concatenate_logs(); | |
| 523 | |
| 524 assert(!_par_traversal_in_progress, "Invariant between iterations."); | |
| 525 if (ParallelGCThreads > 0) { | |
| 526 set_par_traversal(true); | |
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527 _seq_task->set_par_threads((int)n_workers()); |
| 342 | 528 } |
| 529 guarantee( _cards_scanned == NULL, "invariant" ); | |
| 530 _cards_scanned = NEW_C_HEAP_ARRAY(size_t, n_workers()); | |
| 545 | 531 for (uint i = 0; i < n_workers(); ++i) { |
| 532 _cards_scanned[i] = 0; | |
| 533 } | |
| 342 | 534 _total_cards_scanned = 0; |
| 535 } | |
| 536 | |
| 537 | |
| 538 class cleanUpIteratorsClosure : public HeapRegionClosure { | |
| 539 bool doHeapRegion(HeapRegion *r) { | |
| 540 HeapRegionRemSet* hrrs = r->rem_set(); | |
| 541 hrrs->init_for_par_iteration(); | |
| 542 return false; | |
| 543 } | |
| 544 }; | |
| 545 | |
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546 class UpdateRSetOopsIntoCSImmediate : public OopClosure { |
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547 G1CollectedHeap* _g1; |
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548 public: |
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549 UpdateRSetOopsIntoCSImmediate(G1CollectedHeap* g1) : _g1(g1) { } |
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550 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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551 virtual void do_oop( oop* p) { do_oop_work(p); } |
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552 template <class T> void do_oop_work(T* p) { |
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553 HeapRegion* to = _g1->heap_region_containing(oopDesc::load_decode_heap_oop(p)); |
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554 if (to->in_collection_set()) { |
| 677 | 555 to->rem_set()->add_reference(p, 0); |
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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 class UpdateRSetOopsIntoCSDeferred : public OopClosure { |
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561 G1CollectedHeap* _g1; |
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562 CardTableModRefBS* _ct_bs; |
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563 DirtyCardQueue* _dcq; |
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564 public: |
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565 UpdateRSetOopsIntoCSDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
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566 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) { } |
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567 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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568 virtual void do_oop( oop* p) { do_oop_work(p); } |
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569 template <class T> void do_oop_work(T* p) { |
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570 oop obj = oopDesc::load_decode_heap_oop(p); |
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571 if (_g1->obj_in_cs(obj)) { |
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572 size_t card_index = _ct_bs->index_for(p); |
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573 if (_ct_bs->mark_card_deferred(card_index)) { |
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574 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
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575 } |
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576 } |
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577 } |
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578 }; |
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579 |
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580 template <class T> void HRInto_G1RemSet::new_refs_iterate_work(OopClosure* cl) { |
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581 for (size_t i = 0; i < n_workers(); i++) { |
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582 for (int j = 0; j < _new_refs[i]->length(); j++) { |
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583 T* p = (T*) _new_refs[i]->at(j); |
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584 cl->do_oop(p); |
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585 } |
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586 } |
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587 } |
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588 |
| 342 | 589 void HRInto_G1RemSet::cleanup_after_oops_into_collection_set_do() { |
| 590 guarantee( _cards_scanned != NULL, "invariant" ); | |
| 591 _total_cards_scanned = 0; | |
| 592 for (uint i = 0; i < n_workers(); ++i) | |
| 593 _total_cards_scanned += _cards_scanned[i]; | |
| 594 FREE_C_HEAP_ARRAY(size_t, _cards_scanned); | |
| 595 _cards_scanned = NULL; | |
| 596 // Cleanup after copy | |
| 597 #if G1_REM_SET_LOGGING | |
| 598 PrintRSClosure cl; | |
| 599 _g1->heap_region_iterate(&cl); | |
| 600 #endif | |
| 601 _g1->set_refine_cte_cl_concurrency(true); | |
| 602 cleanUpIteratorsClosure iterClosure; | |
| 603 _g1->collection_set_iterate(&iterClosure); | |
| 604 // Set all cards back to clean. | |
| 605 _g1->cleanUpCardTable(); | |
| 794 | 606 |
| 342 | 607 if (ParallelGCThreads > 0) { |
| 608 set_par_traversal(false); | |
| 609 } | |
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610 |
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611 if (_g1->evacuation_failed()) { |
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612 // Restore remembered sets for the regions pointing into |
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613 // the collection set. |
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614 if (G1DeferredRSUpdate) { |
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615 DirtyCardQueue dcq(&_g1->dirty_card_queue_set()); |
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616 UpdateRSetOopsIntoCSDeferred deferred_update(_g1, &dcq); |
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617 new_refs_iterate(&deferred_update); |
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618 } else { |
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619 UpdateRSetOopsIntoCSImmediate immediate_update(_g1); |
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620 new_refs_iterate(&immediate_update); |
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621 } |
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622 } |
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623 for (uint i = 0; i < n_workers(); i++) { |
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624 _new_refs[i]->clear(); |
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625 } |
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626 |
| 342 | 627 assert(!_par_traversal_in_progress, "Invariant between iterations."); |
| 628 } | |
| 629 | |
| 630 class UpdateRSObjectClosure: public ObjectClosure { | |
| 631 UpdateRSOopClosure* _update_rs_oop_cl; | |
| 632 public: | |
| 633 UpdateRSObjectClosure(UpdateRSOopClosure* update_rs_oop_cl) : | |
| 634 _update_rs_oop_cl(update_rs_oop_cl) {} | |
| 635 void do_object(oop obj) { | |
| 636 obj->oop_iterate(_update_rs_oop_cl); | |
| 637 } | |
| 638 | |
| 639 }; | |
| 640 | |
| 641 class ScrubRSClosure: public HeapRegionClosure { | |
| 642 G1CollectedHeap* _g1h; | |
| 643 BitMap* _region_bm; | |
| 644 BitMap* _card_bm; | |
| 645 CardTableModRefBS* _ctbs; | |
| 646 public: | |
| 647 ScrubRSClosure(BitMap* region_bm, BitMap* card_bm) : | |
| 648 _g1h(G1CollectedHeap::heap()), | |
| 649 _region_bm(region_bm), _card_bm(card_bm), | |
| 650 _ctbs(NULL) | |
| 651 { | |
| 652 ModRefBarrierSet* bs = _g1h->mr_bs(); | |
| 653 guarantee(bs->is_a(BarrierSet::CardTableModRef), "Precondition"); | |
| 654 _ctbs = (CardTableModRefBS*)bs; | |
| 655 } | |
| 656 | |
| 657 bool doHeapRegion(HeapRegion* r) { | |
| 658 if (!r->continuesHumongous()) { | |
| 659 r->rem_set()->scrub(_ctbs, _region_bm, _card_bm); | |
| 660 } | |
| 661 return false; | |
| 662 } | |
| 663 }; | |
| 664 | |
| 665 void HRInto_G1RemSet::scrub(BitMap* region_bm, BitMap* card_bm) { | |
| 666 ScrubRSClosure scrub_cl(region_bm, card_bm); | |
| 667 _g1->heap_region_iterate(&scrub_cl); | |
| 668 } | |
| 669 | |
| 670 void HRInto_G1RemSet::scrub_par(BitMap* region_bm, BitMap* card_bm, | |
| 671 int worker_num, int claim_val) { | |
| 672 ScrubRSClosure scrub_cl(region_bm, card_bm); | |
| 673 _g1->heap_region_par_iterate_chunked(&scrub_cl, worker_num, claim_val); | |
| 674 } | |
| 675 | |
| 676 | |
| 677 static IntHistogram out_of_histo(50, 50); | |
| 678 | |
| 679 void HRInto_G1RemSet::concurrentRefineOneCard(jbyte* card_ptr, int worker_i) { | |
| 680 // If the card is no longer dirty, nothing to do. | |
| 681 if (*card_ptr != CardTableModRefBS::dirty_card_val()) return; | |
| 682 | |
| 683 // Construct the region representing the card. | |
| 684 HeapWord* start = _ct_bs->addr_for(card_ptr); | |
| 685 // And find the region containing it. | |
| 686 HeapRegion* r = _g1->heap_region_containing(start); | |
| 687 if (r == NULL) { | |
| 688 guarantee(_g1->is_in_permanent(start), "Or else where?"); | |
| 689 return; // Not in the G1 heap (might be in perm, for example.) | |
| 690 } | |
| 691 // Why do we have to check here whether a card is on a young region, | |
| 692 // given that we dirty young regions and, as a result, the | |
| 693 // post-barrier is supposed to filter them out and never to enqueue | |
| 694 // them? When we allocate a new region as the "allocation region" we | |
| 695 // actually dirty its cards after we release the lock, since card | |
| 696 // dirtying while holding the lock was a performance bottleneck. So, | |
| 697 // as a result, it is possible for other threads to actually | |
| 698 // allocate objects in the region (after the acquire the lock) | |
| 699 // before all the cards on the region are dirtied. This is unlikely, | |
| 700 // and it doesn't happen often, but it can happen. So, the extra | |
| 701 // check below filters out those cards. | |
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702 if (r->is_young()) { |
| 342 | 703 return; |
| 704 } | |
| 705 // While we are processing RSet buffers during the collection, we | |
| 706 // actually don't want to scan any cards on the collection set, | |
| 707 // since we don't want to update remebered sets with entries that | |
| 708 // point into the collection set, given that live objects from the | |
| 709 // collection set are about to move and such entries will be stale | |
| 710 // very soon. This change also deals with a reliability issue which | |
| 711 // involves scanning a card in the collection set and coming across | |
| 712 // an array that was being chunked and looking malformed. Note, | |
| 713 // however, that if evacuation fails, we have to scan any objects | |
| 714 // that were not moved and create any missing entries. | |
| 715 if (r->in_collection_set()) { | |
| 716 return; | |
| 717 } | |
| 718 | |
| 719 // Should we defer it? | |
| 720 if (_cg1r->use_cache()) { | |
| 721 card_ptr = _cg1r->cache_insert(card_ptr); | |
| 722 // If it was not an eviction, nothing to do. | |
| 723 if (card_ptr == NULL) return; | |
| 724 | |
| 725 // OK, we have to reset the card start, region, etc. | |
| 726 start = _ct_bs->addr_for(card_ptr); | |
| 727 r = _g1->heap_region_containing(start); | |
| 728 if (r == NULL) { | |
| 729 guarantee(_g1->is_in_permanent(start), "Or else where?"); | |
| 730 return; // Not in the G1 heap (might be in perm, for example.) | |
| 731 } | |
| 732 guarantee(!r->is_young(), "It was evicted in the current minor cycle."); | |
| 733 } | |
| 734 | |
| 735 HeapWord* end = _ct_bs->addr_for(card_ptr + 1); | |
| 736 MemRegion dirtyRegion(start, end); | |
| 737 | |
| 738 #if CARD_REPEAT_HISTO | |
| 739 init_ct_freq_table(_g1->g1_reserved_obj_bytes()); | |
| 740 ct_freq_note_card(_ct_bs->index_for(start)); | |
| 741 #endif | |
| 742 | |
| 743 UpdateRSOopClosure update_rs_oop_cl(this, worker_i); | |
| 744 update_rs_oop_cl.set_from(r); | |
| 745 FilterOutOfRegionClosure filter_then_update_rs_oop_cl(r, &update_rs_oop_cl); | |
| 746 | |
| 747 // Undirty the card. | |
| 748 *card_ptr = CardTableModRefBS::clean_card_val(); | |
| 749 // We must complete this write before we do any of the reads below. | |
| 750 OrderAccess::storeload(); | |
| 751 // And process it, being careful of unallocated portions of TLAB's. | |
| 752 HeapWord* stop_point = | |
| 753 r->oops_on_card_seq_iterate_careful(dirtyRegion, | |
| 754 &filter_then_update_rs_oop_cl); | |
| 755 // If stop_point is non-null, then we encountered an unallocated region | |
| 756 // (perhaps the unfilled portion of a TLAB.) For now, we'll dirty the | |
| 757 // card and re-enqueue: if we put off the card until a GC pause, then the | |
| 758 // unallocated portion will be filled in. Alternatively, we might try | |
| 759 // the full complexity of the technique used in "regular" precleaning. | |
| 760 if (stop_point != NULL) { | |
| 761 // The card might have gotten re-dirtied and re-enqueued while we | |
| 762 // worked. (In fact, it's pretty likely.) | |
| 763 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { | |
| 764 *card_ptr = CardTableModRefBS::dirty_card_val(); | |
| 765 MutexLockerEx x(Shared_DirtyCardQ_lock, | |
| 766 Mutex::_no_safepoint_check_flag); | |
| 767 DirtyCardQueue* sdcq = | |
| 768 JavaThread::dirty_card_queue_set().shared_dirty_card_queue(); | |
| 769 sdcq->enqueue(card_ptr); | |
| 770 } | |
| 771 } else { | |
| 772 out_of_histo.add_entry(filter_then_update_rs_oop_cl.out_of_region()); | |
| 773 _conc_refine_cards++; | |
| 774 } | |
| 775 } | |
| 776 | |
| 777 class HRRSStatsIter: public HeapRegionClosure { | |
| 778 size_t _occupied; | |
| 779 size_t _total_mem_sz; | |
| 780 size_t _max_mem_sz; | |
| 781 HeapRegion* _max_mem_sz_region; | |
| 782 public: | |
| 783 HRRSStatsIter() : | |
| 784 _occupied(0), | |
| 785 _total_mem_sz(0), | |
| 786 _max_mem_sz(0), | |
| 787 _max_mem_sz_region(NULL) | |
| 788 {} | |
| 789 | |
| 790 bool doHeapRegion(HeapRegion* r) { | |
| 791 if (r->continuesHumongous()) return false; | |
| 792 size_t mem_sz = r->rem_set()->mem_size(); | |
| 793 if (mem_sz > _max_mem_sz) { | |
| 794 _max_mem_sz = mem_sz; | |
| 795 _max_mem_sz_region = r; | |
| 796 } | |
| 797 _total_mem_sz += mem_sz; | |
| 798 size_t occ = r->rem_set()->occupied(); | |
| 799 _occupied += occ; | |
| 800 return false; | |
| 801 } | |
| 802 size_t total_mem_sz() { return _total_mem_sz; } | |
| 803 size_t max_mem_sz() { return _max_mem_sz; } | |
| 804 size_t occupied() { return _occupied; } | |
| 805 HeapRegion* max_mem_sz_region() { return _max_mem_sz_region; } | |
| 806 }; | |
| 807 | |
| 794 | 808 class PrintRSThreadVTimeClosure : public ThreadClosure { |
| 809 public: | |
| 810 virtual void do_thread(Thread *t) { | |
| 811 ConcurrentG1RefineThread* crt = (ConcurrentG1RefineThread*) t; | |
| 812 gclog_or_tty->print(" %5.2f", crt->vtime_accum()); | |
| 813 } | |
| 814 }; | |
| 815 | |
| 342 | 816 void HRInto_G1RemSet::print_summary_info() { |
| 817 G1CollectedHeap* g1 = G1CollectedHeap::heap(); | |
| 818 | |
| 819 #if CARD_REPEAT_HISTO | |
| 820 gclog_or_tty->print_cr("\nG1 card_repeat count histogram: "); | |
| 821 gclog_or_tty->print_cr(" # of repeats --> # of cards with that number."); | |
| 822 card_repeat_count.print_on(gclog_or_tty); | |
| 823 #endif | |
| 824 | |
| 825 if (FILTEROUTOFREGIONCLOSURE_DOHISTOGRAMCOUNT) { | |
| 826 gclog_or_tty->print_cr("\nG1 rem-set out-of-region histogram: "); | |
| 827 gclog_or_tty->print_cr(" # of CS ptrs --> # of cards with that number."); | |
| 828 out_of_histo.print_on(gclog_or_tty); | |
| 829 } | |
| 794 | 830 gclog_or_tty->print_cr("\n Concurrent RS processed %d cards", |
| 831 _conc_refine_cards); | |
| 342 | 832 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
| 833 jint tot_processed_buffers = | |
| 834 dcqs.processed_buffers_mut() + dcqs.processed_buffers_rs_thread(); | |
| 835 gclog_or_tty->print_cr(" Of %d completed buffers:", tot_processed_buffers); | |
| 794 | 836 gclog_or_tty->print_cr(" %8d (%5.1f%%) by conc RS threads.", |
| 342 | 837 dcqs.processed_buffers_rs_thread(), |
| 838 100.0*(float)dcqs.processed_buffers_rs_thread()/ | |
| 839 (float)tot_processed_buffers); | |
| 840 gclog_or_tty->print_cr(" %8d (%5.1f%%) by mutator threads.", | |
| 841 dcqs.processed_buffers_mut(), | |
| 842 100.0*(float)dcqs.processed_buffers_mut()/ | |
| 843 (float)tot_processed_buffers); | |
| 794 | 844 gclog_or_tty->print_cr(" Conc RS threads times(s)"); |
| 845 PrintRSThreadVTimeClosure p; | |
| 846 gclog_or_tty->print(" "); | |
| 847 g1->concurrent_g1_refine()->threads_do(&p); | |
| 342 | 848 gclog_or_tty->print_cr(""); |
| 794 | 849 |
| 342 | 850 if (G1UseHRIntoRS) { |
| 851 HRRSStatsIter blk; | |
| 852 g1->heap_region_iterate(&blk); | |
| 853 gclog_or_tty->print_cr(" Total heap region rem set sizes = " SIZE_FORMAT "K." | |
| 854 " Max = " SIZE_FORMAT "K.", | |
| 855 blk.total_mem_sz()/K, blk.max_mem_sz()/K); | |
| 856 gclog_or_tty->print_cr(" Static structures = " SIZE_FORMAT "K," | |
| 857 " free_lists = " SIZE_FORMAT "K.", | |
| 858 HeapRegionRemSet::static_mem_size()/K, | |
| 859 HeapRegionRemSet::fl_mem_size()/K); | |
| 860 gclog_or_tty->print_cr(" %d occupied cards represented.", | |
| 861 blk.occupied()); | |
| 862 gclog_or_tty->print_cr(" Max sz region = [" PTR_FORMAT ", " PTR_FORMAT " )" | |
| 677 | 863 ", cap = " SIZE_FORMAT "K, occ = " SIZE_FORMAT "K.", |
| 342 | 864 blk.max_mem_sz_region()->bottom(), blk.max_mem_sz_region()->end(), |
| 865 (blk.max_mem_sz_region()->rem_set()->mem_size() + K - 1)/K, | |
| 866 (blk.max_mem_sz_region()->rem_set()->occupied() + K - 1)/K); | |
| 867 gclog_or_tty->print_cr(" Did %d coarsenings.", | |
| 868 HeapRegionRemSet::n_coarsenings()); | |
| 869 | |
| 870 } | |
| 871 } | |
| 872 void HRInto_G1RemSet::prepare_for_verify() { | |
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873 if (G1HRRSFlushLogBuffersOnVerify && |
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874 (VerifyBeforeGC || VerifyAfterGC) |
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875 && !_g1->full_collection()) { |
| 342 | 876 cleanupHRRS(); |
| 877 _g1->set_refine_cte_cl_concurrency(false); | |
| 878 if (SafepointSynchronize::is_at_safepoint()) { | |
| 879 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 880 dcqs.concatenate_logs(); | |
| 881 } | |
| 882 bool cg1r_use_cache = _cg1r->use_cache(); | |
| 883 _cg1r->set_use_cache(false); | |
| 884 updateRS(0); | |
| 885 _cg1r->set_use_cache(cg1r_use_cache); | |
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886 |
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887 assert(JavaThread::dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
| 342 | 888 } |
| 889 } |