Mon, 09 Mar 2009 13:28:46 -0700
6814575: Update copyright year
Summary: Update copyright for files that have been modified in 2009, up to 03/09
Reviewed-by: katleman, tbell, ohair
ysr@777 | 1 | /* |
xdono@1014 | 2 | * Copyright 2001-2009 Sun Microsystems, Inc. All Rights Reserved. |
ysr@777 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
ysr@777 | 4 | * |
ysr@777 | 5 | * This code is free software; you can redistribute it and/or modify it |
ysr@777 | 6 | * under the terms of the GNU General Public License version 2 only, as |
ysr@777 | 7 | * published by the Free Software Foundation. |
ysr@777 | 8 | * |
ysr@777 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
ysr@777 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
ysr@777 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
ysr@777 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
ysr@777 | 13 | * accompanied this code). |
ysr@777 | 14 | * |
ysr@777 | 15 | * You should have received a copy of the GNU General Public License version |
ysr@777 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
ysr@777 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
ysr@777 | 18 | * |
ysr@777 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
ysr@777 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
ysr@777 | 21 | * have any questions. |
ysr@777 | 22 | * |
ysr@777 | 23 | */ |
ysr@777 | 24 | |
ysr@777 | 25 | #include "incls/_precompiled.incl" |
ysr@777 | 26 | #include "incls/_g1RemSet.cpp.incl" |
ysr@777 | 27 | |
ysr@777 | 28 | #define CARD_REPEAT_HISTO 0 |
ysr@777 | 29 | |
ysr@777 | 30 | #if CARD_REPEAT_HISTO |
ysr@777 | 31 | static size_t ct_freq_sz; |
ysr@777 | 32 | static jbyte* ct_freq = NULL; |
ysr@777 | 33 | |
ysr@777 | 34 | void init_ct_freq_table(size_t heap_sz_bytes) { |
ysr@777 | 35 | if (ct_freq == NULL) { |
ysr@777 | 36 | ct_freq_sz = heap_sz_bytes/CardTableModRefBS::card_size; |
ysr@777 | 37 | ct_freq = new jbyte[ct_freq_sz]; |
ysr@777 | 38 | for (size_t j = 0; j < ct_freq_sz; j++) ct_freq[j] = 0; |
ysr@777 | 39 | } |
ysr@777 | 40 | } |
ysr@777 | 41 | |
ysr@777 | 42 | void ct_freq_note_card(size_t index) { |
ysr@777 | 43 | assert(0 <= index && index < ct_freq_sz, "Bounds error."); |
ysr@777 | 44 | if (ct_freq[index] < 100) { ct_freq[index]++; } |
ysr@777 | 45 | } |
ysr@777 | 46 | |
ysr@777 | 47 | static IntHistogram card_repeat_count(10, 10); |
ysr@777 | 48 | |
ysr@777 | 49 | void ct_freq_update_histo_and_reset() { |
ysr@777 | 50 | for (size_t j = 0; j < ct_freq_sz; j++) { |
ysr@777 | 51 | card_repeat_count.add_entry(ct_freq[j]); |
ysr@777 | 52 | ct_freq[j] = 0; |
ysr@777 | 53 | } |
ysr@777 | 54 | |
ysr@777 | 55 | } |
ysr@777 | 56 | #endif |
ysr@777 | 57 | |
ysr@777 | 58 | |
ysr@777 | 59 | class IntoCSOopClosure: public OopsInHeapRegionClosure { |
ysr@777 | 60 | OopsInHeapRegionClosure* _blk; |
ysr@777 | 61 | G1CollectedHeap* _g1; |
ysr@777 | 62 | public: |
ysr@777 | 63 | IntoCSOopClosure(G1CollectedHeap* g1, OopsInHeapRegionClosure* blk) : |
ysr@777 | 64 | _g1(g1), _blk(blk) {} |
ysr@777 | 65 | void set_region(HeapRegion* from) { |
ysr@777 | 66 | _blk->set_region(from); |
ysr@777 | 67 | } |
ysr@777 | 68 | virtual void do_oop(narrowOop* p) { |
ysr@777 | 69 | guarantee(false, "NYI"); |
ysr@777 | 70 | } |
ysr@777 | 71 | virtual void do_oop(oop* p) { |
ysr@777 | 72 | oop obj = *p; |
ysr@777 | 73 | if (_g1->obj_in_cs(obj)) _blk->do_oop(p); |
ysr@777 | 74 | } |
ysr@777 | 75 | bool apply_to_weak_ref_discovered_field() { return true; } |
ysr@777 | 76 | bool idempotent() { return true; } |
ysr@777 | 77 | }; |
ysr@777 | 78 | |
ysr@777 | 79 | class IntoCSRegionClosure: public HeapRegionClosure { |
ysr@777 | 80 | IntoCSOopClosure _blk; |
ysr@777 | 81 | G1CollectedHeap* _g1; |
ysr@777 | 82 | public: |
ysr@777 | 83 | IntoCSRegionClosure(G1CollectedHeap* g1, OopsInHeapRegionClosure* blk) : |
ysr@777 | 84 | _g1(g1), _blk(g1, blk) {} |
ysr@777 | 85 | bool doHeapRegion(HeapRegion* r) { |
ysr@777 | 86 | if (!r->in_collection_set()) { |
ysr@777 | 87 | _blk.set_region(r); |
ysr@777 | 88 | if (r->isHumongous()) { |
ysr@777 | 89 | if (r->startsHumongous()) { |
ysr@777 | 90 | oop obj = oop(r->bottom()); |
ysr@777 | 91 | obj->oop_iterate(&_blk); |
ysr@777 | 92 | } |
ysr@777 | 93 | } else { |
ysr@777 | 94 | r->oop_before_save_marks_iterate(&_blk); |
ysr@777 | 95 | } |
ysr@777 | 96 | } |
ysr@777 | 97 | return false; |
ysr@777 | 98 | } |
ysr@777 | 99 | }; |
ysr@777 | 100 | |
ysr@777 | 101 | void |
ysr@777 | 102 | StupidG1RemSet::oops_into_collection_set_do(OopsInHeapRegionClosure* oc, |
ysr@777 | 103 | int worker_i) { |
ysr@777 | 104 | IntoCSRegionClosure rc(_g1, oc); |
ysr@777 | 105 | _g1->heap_region_iterate(&rc); |
ysr@777 | 106 | } |
ysr@777 | 107 | |
ysr@777 | 108 | class UpdateRSOopClosure: public OopClosure { |
ysr@777 | 109 | HeapRegion* _from; |
ysr@777 | 110 | HRInto_G1RemSet* _rs; |
ysr@777 | 111 | int _worker_i; |
ysr@777 | 112 | public: |
ysr@777 | 113 | UpdateRSOopClosure(HRInto_G1RemSet* rs, int worker_i = 0) : |
ysr@777 | 114 | _from(NULL), _rs(rs), _worker_i(worker_i) { |
ysr@777 | 115 | guarantee(_rs != NULL, "Requires an HRIntoG1RemSet"); |
ysr@777 | 116 | } |
ysr@777 | 117 | |
ysr@777 | 118 | void set_from(HeapRegion* from) { |
ysr@777 | 119 | assert(from != NULL, "from region must be non-NULL"); |
ysr@777 | 120 | _from = from; |
ysr@777 | 121 | } |
ysr@777 | 122 | |
ysr@777 | 123 | virtual void do_oop(narrowOop* p) { |
ysr@777 | 124 | guarantee(false, "NYI"); |
ysr@777 | 125 | } |
ysr@777 | 126 | virtual void do_oop(oop* p) { |
ysr@777 | 127 | assert(_from != NULL, "from region must be non-NULL"); |
ysr@777 | 128 | _rs->par_write_ref(_from, p, _worker_i); |
ysr@777 | 129 | } |
ysr@777 | 130 | // Override: this closure is idempotent. |
ysr@777 | 131 | // bool idempotent() { return true; } |
ysr@777 | 132 | bool apply_to_weak_ref_discovered_field() { return true; } |
ysr@777 | 133 | }; |
ysr@777 | 134 | |
ysr@777 | 135 | class UpdateRSOutOfRegionClosure: public HeapRegionClosure { |
ysr@777 | 136 | G1CollectedHeap* _g1h; |
ysr@777 | 137 | ModRefBarrierSet* _mr_bs; |
ysr@777 | 138 | UpdateRSOopClosure _cl; |
ysr@777 | 139 | int _worker_i; |
ysr@777 | 140 | public: |
ysr@777 | 141 | UpdateRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : |
ysr@777 | 142 | _cl(g1->g1_rem_set()->as_HRInto_G1RemSet(), worker_i), |
ysr@777 | 143 | _mr_bs(g1->mr_bs()), |
ysr@777 | 144 | _worker_i(worker_i), |
ysr@777 | 145 | _g1h(g1) |
ysr@777 | 146 | {} |
ysr@777 | 147 | bool doHeapRegion(HeapRegion* r) { |
ysr@777 | 148 | if (!r->in_collection_set() && !r->continuesHumongous()) { |
ysr@777 | 149 | _cl.set_from(r); |
ysr@777 | 150 | r->set_next_filter_kind(HeapRegionDCTOC::OutOfRegionFilterKind); |
ysr@777 | 151 | _mr_bs->mod_oop_in_space_iterate(r, &_cl, true, true); |
ysr@777 | 152 | } |
ysr@777 | 153 | return false; |
ysr@777 | 154 | } |
ysr@777 | 155 | }; |
ysr@777 | 156 | |
ysr@777 | 157 | class VerifyRSCleanCardOopClosure: public OopClosure { |
ysr@777 | 158 | G1CollectedHeap* _g1; |
ysr@777 | 159 | public: |
ysr@777 | 160 | VerifyRSCleanCardOopClosure(G1CollectedHeap* g1) : _g1(g1) {} |
ysr@777 | 161 | |
ysr@777 | 162 | virtual void do_oop(narrowOop* p) { |
ysr@777 | 163 | guarantee(false, "NYI"); |
ysr@777 | 164 | } |
ysr@777 | 165 | virtual void do_oop(oop* p) { |
ysr@777 | 166 | oop obj = *p; |
ysr@777 | 167 | HeapRegion* to = _g1->heap_region_containing(obj); |
ysr@777 | 168 | guarantee(to == NULL || !to->in_collection_set(), |
ysr@777 | 169 | "Missed a rem set member."); |
ysr@777 | 170 | } |
ysr@777 | 171 | }; |
ysr@777 | 172 | |
ysr@777 | 173 | HRInto_G1RemSet::HRInto_G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs) |
ysr@777 | 174 | : G1RemSet(g1), _ct_bs(ct_bs), _g1p(_g1->g1_policy()), |
ysr@777 | 175 | _cg1r(g1->concurrent_g1_refine()), |
ysr@777 | 176 | _par_traversal_in_progress(false), _new_refs(NULL), |
ysr@777 | 177 | _cards_scanned(NULL), _total_cards_scanned(0) |
ysr@777 | 178 | { |
ysr@777 | 179 | _seq_task = new SubTasksDone(NumSeqTasks); |
ysr@777 | 180 | _new_refs = NEW_C_HEAP_ARRAY(GrowableArray<oop*>*, ParallelGCThreads); |
ysr@777 | 181 | } |
ysr@777 | 182 | |
ysr@777 | 183 | HRInto_G1RemSet::~HRInto_G1RemSet() { |
ysr@777 | 184 | delete _seq_task; |
ysr@777 | 185 | } |
ysr@777 | 186 | |
ysr@777 | 187 | void CountNonCleanMemRegionClosure::do_MemRegion(MemRegion mr) { |
ysr@777 | 188 | if (_g1->is_in_g1_reserved(mr.start())) { |
ysr@777 | 189 | _n += (int) ((mr.byte_size() / CardTableModRefBS::card_size)); |
ysr@777 | 190 | if (_start_first == NULL) _start_first = mr.start(); |
ysr@777 | 191 | } |
ysr@777 | 192 | } |
ysr@777 | 193 | |
ysr@777 | 194 | class ScanRSClosure : public HeapRegionClosure { |
ysr@777 | 195 | size_t _cards_done, _cards; |
ysr@777 | 196 | G1CollectedHeap* _g1h; |
ysr@777 | 197 | OopsInHeapRegionClosure* _oc; |
ysr@777 | 198 | G1BlockOffsetSharedArray* _bot_shared; |
ysr@777 | 199 | CardTableModRefBS *_ct_bs; |
ysr@777 | 200 | int _worker_i; |
ysr@777 | 201 | bool _try_claimed; |
ysr@777 | 202 | public: |
ysr@777 | 203 | ScanRSClosure(OopsInHeapRegionClosure* oc, int worker_i) : |
ysr@777 | 204 | _oc(oc), |
ysr@777 | 205 | _cards(0), |
ysr@777 | 206 | _cards_done(0), |
ysr@777 | 207 | _worker_i(worker_i), |
ysr@777 | 208 | _try_claimed(false) |
ysr@777 | 209 | { |
ysr@777 | 210 | _g1h = G1CollectedHeap::heap(); |
ysr@777 | 211 | _bot_shared = _g1h->bot_shared(); |
ysr@777 | 212 | _ct_bs = (CardTableModRefBS*) (_g1h->barrier_set()); |
ysr@777 | 213 | } |
ysr@777 | 214 | |
ysr@777 | 215 | void set_try_claimed() { _try_claimed = true; } |
ysr@777 | 216 | |
ysr@777 | 217 | void scanCard(size_t index, HeapRegion *r) { |
ysr@777 | 218 | _cards_done++; |
ysr@777 | 219 | DirtyCardToOopClosure* cl = |
ysr@777 | 220 | r->new_dcto_closure(_oc, |
ysr@777 | 221 | CardTableModRefBS::Precise, |
ysr@777 | 222 | HeapRegionDCTOC::IntoCSFilterKind); |
ysr@777 | 223 | |
ysr@777 | 224 | // Set the "from" region in the closure. |
ysr@777 | 225 | _oc->set_region(r); |
ysr@777 | 226 | HeapWord* card_start = _bot_shared->address_for_index(index); |
ysr@777 | 227 | HeapWord* card_end = card_start + G1BlockOffsetSharedArray::N_words; |
ysr@777 | 228 | Space *sp = SharedHeap::heap()->space_containing(card_start); |
ysr@777 | 229 | MemRegion sm_region; |
ysr@777 | 230 | if (ParallelGCThreads > 0) { |
ysr@777 | 231 | // first find the used area |
ysr@777 | 232 | sm_region = sp->used_region_at_save_marks(); |
ysr@777 | 233 | } else { |
ysr@777 | 234 | // The closure is not idempotent. We shouldn't look at objects |
ysr@777 | 235 | // allocated during the GC. |
ysr@777 | 236 | sm_region = sp->used_region_at_save_marks(); |
ysr@777 | 237 | } |
ysr@777 | 238 | MemRegion mr = sm_region.intersection(MemRegion(card_start,card_end)); |
ysr@777 | 239 | if (!mr.is_empty()) { |
ysr@777 | 240 | cl->do_MemRegion(mr); |
ysr@777 | 241 | } |
ysr@777 | 242 | } |
ysr@777 | 243 | |
ysr@777 | 244 | void printCard(HeapRegion* card_region, size_t card_index, |
ysr@777 | 245 | HeapWord* card_start) { |
ysr@777 | 246 | gclog_or_tty->print_cr("T %d Region [" PTR_FORMAT ", " PTR_FORMAT ") " |
ysr@777 | 247 | "RS names card %p: " |
ysr@777 | 248 | "[" PTR_FORMAT ", " PTR_FORMAT ")", |
ysr@777 | 249 | _worker_i, |
ysr@777 | 250 | card_region->bottom(), card_region->end(), |
ysr@777 | 251 | card_index, |
ysr@777 | 252 | card_start, card_start + G1BlockOffsetSharedArray::N_words); |
ysr@777 | 253 | } |
ysr@777 | 254 | |
ysr@777 | 255 | bool doHeapRegion(HeapRegion* r) { |
ysr@777 | 256 | assert(r->in_collection_set(), "should only be called on elements of CS."); |
ysr@777 | 257 | HeapRegionRemSet* hrrs = r->rem_set(); |
ysr@777 | 258 | if (hrrs->iter_is_complete()) return false; // All done. |
ysr@777 | 259 | if (!_try_claimed && !hrrs->claim_iter()) return false; |
ysr@777 | 260 | // If we didn't return above, then |
ysr@777 | 261 | // _try_claimed || r->claim_iter() |
ysr@777 | 262 | // is true: either we're supposed to work on claimed-but-not-complete |
ysr@777 | 263 | // regions, or we successfully claimed the region. |
ysr@777 | 264 | HeapRegionRemSetIterator* iter = _g1h->rem_set_iterator(_worker_i); |
ysr@777 | 265 | hrrs->init_iterator(iter); |
ysr@777 | 266 | size_t card_index; |
ysr@777 | 267 | while (iter->has_next(card_index)) { |
ysr@777 | 268 | HeapWord* card_start = _g1h->bot_shared()->address_for_index(card_index); |
ysr@777 | 269 | |
ysr@777 | 270 | #if 0 |
ysr@777 | 271 | gclog_or_tty->print("Rem set iteration yielded card [" PTR_FORMAT ", " PTR_FORMAT ").\n", |
ysr@777 | 272 | card_start, card_start + CardTableModRefBS::card_size_in_words); |
ysr@777 | 273 | #endif |
ysr@777 | 274 | |
ysr@777 | 275 | HeapRegion* card_region = _g1h->heap_region_containing(card_start); |
ysr@777 | 276 | assert(card_region != NULL, "Yielding cards not in the heap?"); |
ysr@777 | 277 | _cards++; |
ysr@777 | 278 | |
ysr@777 | 279 | if (!card_region->in_collection_set()) { |
ysr@777 | 280 | // If the card is dirty, then we will scan it during updateRS. |
ysr@777 | 281 | if (!_ct_bs->is_card_claimed(card_index) && |
ysr@777 | 282 | !_ct_bs->is_card_dirty(card_index)) { |
ysr@777 | 283 | assert(_ct_bs->is_card_clean(card_index) || |
ysr@777 | 284 | _ct_bs->is_card_claimed(card_index), |
ysr@777 | 285 | "Card is either dirty, clean, or claimed"); |
ysr@777 | 286 | if (_ct_bs->claim_card(card_index)) |
ysr@777 | 287 | scanCard(card_index, card_region); |
ysr@777 | 288 | } |
ysr@777 | 289 | } |
ysr@777 | 290 | } |
ysr@777 | 291 | hrrs->set_iter_complete(); |
ysr@777 | 292 | return false; |
ysr@777 | 293 | } |
ysr@777 | 294 | // Set all cards back to clean. |
ysr@777 | 295 | void cleanup() {_g1h->cleanUpCardTable();} |
ysr@777 | 296 | size_t cards_done() { return _cards_done;} |
ysr@777 | 297 | size_t cards_looked_up() { return _cards;} |
ysr@777 | 298 | }; |
ysr@777 | 299 | |
ysr@777 | 300 | // We want the parallel threads to start their scanning at |
ysr@777 | 301 | // different collection set regions to avoid contention. |
ysr@777 | 302 | // If we have: |
ysr@777 | 303 | // n collection set regions |
ysr@777 | 304 | // p threads |
ysr@777 | 305 | // Then thread t will start at region t * floor (n/p) |
ysr@777 | 306 | |
ysr@777 | 307 | HeapRegion* HRInto_G1RemSet::calculateStartRegion(int worker_i) { |
ysr@777 | 308 | HeapRegion* result = _g1p->collection_set(); |
ysr@777 | 309 | if (ParallelGCThreads > 0) { |
ysr@777 | 310 | size_t cs_size = _g1p->collection_set_size(); |
ysr@777 | 311 | int n_workers = _g1->workers()->total_workers(); |
ysr@777 | 312 | size_t cs_spans = cs_size / n_workers; |
ysr@777 | 313 | size_t ind = cs_spans * worker_i; |
ysr@777 | 314 | for (size_t i = 0; i < ind; i++) |
ysr@777 | 315 | result = result->next_in_collection_set(); |
ysr@777 | 316 | } |
ysr@777 | 317 | return result; |
ysr@777 | 318 | } |
ysr@777 | 319 | |
ysr@777 | 320 | void HRInto_G1RemSet::scanRS(OopsInHeapRegionClosure* oc, int worker_i) { |
ysr@777 | 321 | double rs_time_start = os::elapsedTime(); |
ysr@777 | 322 | HeapRegion *startRegion = calculateStartRegion(worker_i); |
ysr@777 | 323 | |
ysr@777 | 324 | BufferingOopsInHeapRegionClosure boc(oc); |
ysr@777 | 325 | ScanRSClosure scanRScl(&boc, worker_i); |
ysr@777 | 326 | _g1->collection_set_iterate_from(startRegion, &scanRScl); |
ysr@777 | 327 | scanRScl.set_try_claimed(); |
ysr@777 | 328 | _g1->collection_set_iterate_from(startRegion, &scanRScl); |
ysr@777 | 329 | |
ysr@777 | 330 | boc.done(); |
ysr@777 | 331 | double closure_app_time_sec = boc.closure_app_seconds(); |
ysr@777 | 332 | double scan_rs_time_sec = (os::elapsedTime() - rs_time_start) - |
ysr@777 | 333 | closure_app_time_sec; |
ysr@777 | 334 | double closure_app_time_ms = closure_app_time_sec * 1000.0; |
ysr@777 | 335 | |
ysr@777 | 336 | assert( _cards_scanned != NULL, "invariant" ); |
ysr@777 | 337 | _cards_scanned[worker_i] = scanRScl.cards_done(); |
ysr@777 | 338 | |
ysr@777 | 339 | _g1p->record_scan_rs_start_time(worker_i, rs_time_start * 1000.0); |
ysr@777 | 340 | _g1p->record_scan_rs_time(worker_i, scan_rs_time_sec * 1000.0); |
ysr@777 | 341 | if (ParallelGCThreads > 0) { |
ysr@777 | 342 | // In this case, we called scanNewRefsRS and recorded the corresponding |
ysr@777 | 343 | // time. |
ysr@777 | 344 | double scan_new_refs_time_ms = _g1p->get_scan_new_refs_time(worker_i); |
ysr@777 | 345 | if (scan_new_refs_time_ms > 0.0) { |
ysr@777 | 346 | closure_app_time_ms += scan_new_refs_time_ms; |
ysr@777 | 347 | } |
ysr@777 | 348 | } |
ysr@777 | 349 | _g1p->record_obj_copy_time(worker_i, closure_app_time_ms); |
ysr@777 | 350 | } |
ysr@777 | 351 | |
ysr@777 | 352 | void HRInto_G1RemSet::updateRS(int worker_i) { |
ysr@777 | 353 | ConcurrentG1Refine* cg1r = _g1->concurrent_g1_refine(); |
ysr@777 | 354 | |
ysr@777 | 355 | double start = os::elapsedTime(); |
ysr@777 | 356 | _g1p->record_update_rs_start_time(worker_i, start * 1000.0); |
ysr@777 | 357 | |
ysr@777 | 358 | if (G1RSBarrierUseQueue && !cg1r->do_traversal()) { |
ysr@777 | 359 | // Apply the appropriate closure to all remaining log entries. |
ysr@777 | 360 | _g1->iterate_dirty_card_closure(false, worker_i); |
ysr@777 | 361 | // Now there should be no dirty cards. |
ysr@777 | 362 | if (G1RSLogCheckCardTable) { |
ysr@777 | 363 | CountNonCleanMemRegionClosure cl(_g1); |
ysr@777 | 364 | _ct_bs->mod_card_iterate(&cl); |
ysr@777 | 365 | // XXX This isn't true any more: keeping cards of young regions |
ysr@777 | 366 | // marked dirty broke it. Need some reasonable fix. |
ysr@777 | 367 | guarantee(cl.n() == 0, "Card table should be clean."); |
ysr@777 | 368 | } |
ysr@777 | 369 | } else { |
ysr@777 | 370 | UpdateRSOutOfRegionClosure update_rs(_g1, worker_i); |
ysr@777 | 371 | _g1->heap_region_iterate(&update_rs); |
ysr@777 | 372 | // We did a traversal; no further one is necessary. |
ysr@777 | 373 | if (G1RSBarrierUseQueue) { |
ysr@777 | 374 | assert(cg1r->do_traversal(), "Or we shouldn't have gotten here."); |
ysr@777 | 375 | cg1r->set_pya_cancel(); |
ysr@777 | 376 | } |
ysr@777 | 377 | if (_cg1r->use_cache()) { |
ysr@777 | 378 | _cg1r->clear_and_record_card_counts(); |
ysr@777 | 379 | _cg1r->clear_hot_cache(); |
ysr@777 | 380 | } |
ysr@777 | 381 | } |
ysr@777 | 382 | _g1p->record_update_rs_time(worker_i, (os::elapsedTime() - start) * 1000.0); |
ysr@777 | 383 | } |
ysr@777 | 384 | |
ysr@777 | 385 | #ifndef PRODUCT |
ysr@777 | 386 | class PrintRSClosure : public HeapRegionClosure { |
ysr@777 | 387 | int _count; |
ysr@777 | 388 | public: |
ysr@777 | 389 | PrintRSClosure() : _count(0) {} |
ysr@777 | 390 | bool doHeapRegion(HeapRegion* r) { |
ysr@777 | 391 | HeapRegionRemSet* hrrs = r->rem_set(); |
ysr@777 | 392 | _count += (int) hrrs->occupied(); |
ysr@777 | 393 | if (hrrs->occupied() == 0) { |
ysr@777 | 394 | gclog_or_tty->print("Heap Region [" PTR_FORMAT ", " PTR_FORMAT ") " |
ysr@777 | 395 | "has no remset entries\n", |
ysr@777 | 396 | r->bottom(), r->end()); |
ysr@777 | 397 | } else { |
ysr@777 | 398 | gclog_or_tty->print("Printing rem set for heap region [" PTR_FORMAT ", " PTR_FORMAT ")\n", |
ysr@777 | 399 | r->bottom(), r->end()); |
ysr@777 | 400 | r->print(); |
ysr@777 | 401 | hrrs->print(); |
ysr@777 | 402 | gclog_or_tty->print("\nDone printing rem set\n"); |
ysr@777 | 403 | } |
ysr@777 | 404 | return false; |
ysr@777 | 405 | } |
ysr@777 | 406 | int occupied() {return _count;} |
ysr@777 | 407 | }; |
ysr@777 | 408 | #endif |
ysr@777 | 409 | |
ysr@777 | 410 | class CountRSSizeClosure: public HeapRegionClosure { |
ysr@777 | 411 | size_t _n; |
ysr@777 | 412 | size_t _tot; |
ysr@777 | 413 | size_t _max; |
ysr@777 | 414 | HeapRegion* _max_r; |
ysr@777 | 415 | enum { |
ysr@777 | 416 | N = 20, |
ysr@777 | 417 | MIN = 6 |
ysr@777 | 418 | }; |
ysr@777 | 419 | int _histo[N]; |
ysr@777 | 420 | public: |
ysr@777 | 421 | CountRSSizeClosure() : _n(0), _tot(0), _max(0), _max_r(NULL) { |
ysr@777 | 422 | for (int i = 0; i < N; i++) _histo[i] = 0; |
ysr@777 | 423 | } |
ysr@777 | 424 | bool doHeapRegion(HeapRegion* r) { |
ysr@777 | 425 | if (!r->continuesHumongous()) { |
ysr@777 | 426 | size_t occ = r->rem_set()->occupied(); |
ysr@777 | 427 | _n++; |
ysr@777 | 428 | _tot += occ; |
ysr@777 | 429 | if (occ > _max) { |
ysr@777 | 430 | _max = occ; |
ysr@777 | 431 | _max_r = r; |
ysr@777 | 432 | } |
ysr@777 | 433 | // Fit it into a histo bin. |
ysr@777 | 434 | int s = 1 << MIN; |
ysr@777 | 435 | int i = 0; |
ysr@777 | 436 | while (occ > (size_t) s && i < (N-1)) { |
ysr@777 | 437 | s = s << 1; |
ysr@777 | 438 | i++; |
ysr@777 | 439 | } |
ysr@777 | 440 | _histo[i]++; |
ysr@777 | 441 | } |
ysr@777 | 442 | return false; |
ysr@777 | 443 | } |
ysr@777 | 444 | size_t n() { return _n; } |
ysr@777 | 445 | size_t tot() { return _tot; } |
ysr@777 | 446 | size_t mx() { return _max; } |
ysr@777 | 447 | HeapRegion* mxr() { return _max_r; } |
ysr@777 | 448 | void print_histo() { |
ysr@777 | 449 | int mx = N; |
ysr@777 | 450 | while (mx >= 0) { |
ysr@777 | 451 | if (_histo[mx-1] > 0) break; |
ysr@777 | 452 | mx--; |
ysr@777 | 453 | } |
ysr@777 | 454 | gclog_or_tty->print_cr("Number of regions with given RS sizes:"); |
ysr@777 | 455 | gclog_or_tty->print_cr(" <= %8d %8d", 1 << MIN, _histo[0]); |
ysr@777 | 456 | for (int i = 1; i < mx-1; i++) { |
ysr@777 | 457 | gclog_or_tty->print_cr(" %8d - %8d %8d", |
ysr@777 | 458 | (1 << (MIN + i - 1)) + 1, |
ysr@777 | 459 | 1 << (MIN + i), |
ysr@777 | 460 | _histo[i]); |
ysr@777 | 461 | } |
ysr@777 | 462 | gclog_or_tty->print_cr(" > %8d %8d", (1 << (MIN+mx-2))+1, _histo[mx-1]); |
ysr@777 | 463 | } |
ysr@777 | 464 | }; |
ysr@777 | 465 | |
ysr@777 | 466 | void |
ysr@777 | 467 | HRInto_G1RemSet::scanNewRefsRS(OopsInHeapRegionClosure* oc, |
ysr@777 | 468 | int worker_i) { |
ysr@777 | 469 | double scan_new_refs_start_sec = os::elapsedTime(); |
ysr@777 | 470 | G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
ysr@777 | 471 | CardTableModRefBS* ct_bs = (CardTableModRefBS*) (g1h->barrier_set()); |
ysr@777 | 472 | while (_new_refs[worker_i]->is_nonempty()) { |
ysr@777 | 473 | oop* p = _new_refs[worker_i]->pop(); |
ysr@777 | 474 | oop obj = *p; |
ysr@777 | 475 | // *p was in the collection set when p was pushed on "_new_refs", but |
ysr@777 | 476 | // another thread may have processed this location from an RS, so it |
ysr@777 | 477 | // might not point into the CS any longer. If so, it's obviously been |
ysr@777 | 478 | // processed, and we don't need to do anything further. |
ysr@777 | 479 | if (g1h->obj_in_cs(obj)) { |
ysr@777 | 480 | HeapRegion* r = g1h->heap_region_containing(p); |
ysr@777 | 481 | |
ysr@777 | 482 | DEBUG_ONLY(HeapRegion* to = g1h->heap_region_containing(obj)); |
ysr@777 | 483 | assert(ParallelGCThreads > 1 |
ysr@777 | 484 | || to->rem_set()->contains_reference(p), |
ysr@777 | 485 | "Invariant: pushed after being added." |
ysr@777 | 486 | "(Not reliable in parallel code.)"); |
ysr@777 | 487 | oc->set_region(r); |
ysr@777 | 488 | // If "p" has already been processed concurrently, this is |
ysr@777 | 489 | // idempotent. |
ysr@777 | 490 | oc->do_oop(p); |
ysr@777 | 491 | } |
ysr@777 | 492 | } |
ysr@777 | 493 | _g1p->record_scan_new_refs_time(worker_i, |
ysr@777 | 494 | (os::elapsedTime() - scan_new_refs_start_sec) |
ysr@777 | 495 | * 1000.0); |
ysr@777 | 496 | } |
ysr@777 | 497 | |
ysr@777 | 498 | void HRInto_G1RemSet::set_par_traversal(bool b) { |
ysr@777 | 499 | _par_traversal_in_progress = b; |
ysr@777 | 500 | HeapRegionRemSet::set_par_traversal(b); |
ysr@777 | 501 | } |
ysr@777 | 502 | |
ysr@777 | 503 | void HRInto_G1RemSet::cleanupHRRS() { |
ysr@777 | 504 | HeapRegionRemSet::cleanup(); |
ysr@777 | 505 | } |
ysr@777 | 506 | |
ysr@777 | 507 | void |
ysr@777 | 508 | HRInto_G1RemSet::oops_into_collection_set_do(OopsInHeapRegionClosure* oc, |
ysr@777 | 509 | int worker_i) { |
ysr@777 | 510 | #if CARD_REPEAT_HISTO |
ysr@777 | 511 | ct_freq_update_histo_and_reset(); |
ysr@777 | 512 | #endif |
ysr@777 | 513 | if (worker_i == 0) { |
ysr@777 | 514 | _cg1r->clear_and_record_card_counts(); |
ysr@777 | 515 | } |
ysr@777 | 516 | |
ysr@777 | 517 | // Make this into a command-line flag... |
ysr@777 | 518 | if (G1RSCountHisto && (ParallelGCThreads == 0 || worker_i == 0)) { |
ysr@777 | 519 | CountRSSizeClosure count_cl; |
ysr@777 | 520 | _g1->heap_region_iterate(&count_cl); |
ysr@777 | 521 | gclog_or_tty->print_cr("Avg of %d RS counts is %f, max is %d, " |
ysr@777 | 522 | "max region is " PTR_FORMAT, |
ysr@777 | 523 | count_cl.n(), (float)count_cl.tot()/(float)count_cl.n(), |
ysr@777 | 524 | count_cl.mx(), count_cl.mxr()); |
ysr@777 | 525 | count_cl.print_histo(); |
ysr@777 | 526 | } |
ysr@777 | 527 | |
ysr@777 | 528 | if (ParallelGCThreads > 0) { |
ysr@777 | 529 | // This is a temporary change to serialize the update and scanning |
ysr@777 | 530 | // of remembered sets. There are some race conditions when this is |
ysr@777 | 531 | // done in parallel and they are causing failures. When we resolve |
ysr@777 | 532 | // said race conditions, we'll revert back to parallel remembered |
ysr@777 | 533 | // set updating and scanning. See CRs 6677707 and 6677708. |
ysr@777 | 534 | if (worker_i == 0) { |
ysr@777 | 535 | updateRS(worker_i); |
ysr@777 | 536 | scanNewRefsRS(oc, worker_i); |
ysr@777 | 537 | scanRS(oc, worker_i); |
ysr@777 | 538 | } |
ysr@777 | 539 | } else { |
ysr@777 | 540 | assert(worker_i == 0, "invariant"); |
ysr@777 | 541 | |
ysr@777 | 542 | updateRS(0); |
ysr@777 | 543 | scanRS(oc, 0); |
ysr@777 | 544 | } |
ysr@777 | 545 | } |
ysr@777 | 546 | |
ysr@777 | 547 | void HRInto_G1RemSet:: |
ysr@777 | 548 | prepare_for_oops_into_collection_set_do() { |
ysr@777 | 549 | #if G1_REM_SET_LOGGING |
ysr@777 | 550 | PrintRSClosure cl; |
ysr@777 | 551 | _g1->collection_set_iterate(&cl); |
ysr@777 | 552 | #endif |
ysr@777 | 553 | cleanupHRRS(); |
ysr@777 | 554 | ConcurrentG1Refine* cg1r = _g1->concurrent_g1_refine(); |
ysr@777 | 555 | _g1->set_refine_cte_cl_concurrency(false); |
ysr@777 | 556 | DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
ysr@777 | 557 | dcqs.concatenate_logs(); |
ysr@777 | 558 | |
ysr@777 | 559 | assert(!_par_traversal_in_progress, "Invariant between iterations."); |
ysr@777 | 560 | if (ParallelGCThreads > 0) { |
ysr@777 | 561 | set_par_traversal(true); |
ysr@777 | 562 | int n_workers = _g1->workers()->total_workers(); |
ysr@777 | 563 | _seq_task->set_par_threads(n_workers); |
ysr@777 | 564 | for (uint i = 0; i < ParallelGCThreads; i++) |
ysr@777 | 565 | _new_refs[i] = new (ResourceObj::C_HEAP) GrowableArray<oop*>(8192,true); |
ysr@777 | 566 | |
ysr@777 | 567 | if (cg1r->do_traversal()) { |
ysr@777 | 568 | updateRS(0); |
ysr@777 | 569 | // Have to do this again after updaters |
ysr@777 | 570 | cleanupHRRS(); |
ysr@777 | 571 | } |
ysr@777 | 572 | } |
ysr@777 | 573 | guarantee( _cards_scanned == NULL, "invariant" ); |
ysr@777 | 574 | _cards_scanned = NEW_C_HEAP_ARRAY(size_t, n_workers()); |
apetrusenko@980 | 575 | for (uint i = 0; i < n_workers(); ++i) { |
apetrusenko@980 | 576 | _cards_scanned[i] = 0; |
apetrusenko@980 | 577 | } |
ysr@777 | 578 | _total_cards_scanned = 0; |
ysr@777 | 579 | } |
ysr@777 | 580 | |
ysr@777 | 581 | |
ysr@777 | 582 | class cleanUpIteratorsClosure : public HeapRegionClosure { |
ysr@777 | 583 | bool doHeapRegion(HeapRegion *r) { |
ysr@777 | 584 | HeapRegionRemSet* hrrs = r->rem_set(); |
ysr@777 | 585 | hrrs->init_for_par_iteration(); |
ysr@777 | 586 | return false; |
ysr@777 | 587 | } |
ysr@777 | 588 | }; |
ysr@777 | 589 | |
ysr@777 | 590 | void HRInto_G1RemSet::cleanup_after_oops_into_collection_set_do() { |
ysr@777 | 591 | guarantee( _cards_scanned != NULL, "invariant" ); |
ysr@777 | 592 | _total_cards_scanned = 0; |
ysr@777 | 593 | for (uint i = 0; i < n_workers(); ++i) |
ysr@777 | 594 | _total_cards_scanned += _cards_scanned[i]; |
ysr@777 | 595 | FREE_C_HEAP_ARRAY(size_t, _cards_scanned); |
ysr@777 | 596 | _cards_scanned = NULL; |
ysr@777 | 597 | // Cleanup after copy |
ysr@777 | 598 | #if G1_REM_SET_LOGGING |
ysr@777 | 599 | PrintRSClosure cl; |
ysr@777 | 600 | _g1->heap_region_iterate(&cl); |
ysr@777 | 601 | #endif |
ysr@777 | 602 | _g1->set_refine_cte_cl_concurrency(true); |
ysr@777 | 603 | cleanUpIteratorsClosure iterClosure; |
ysr@777 | 604 | _g1->collection_set_iterate(&iterClosure); |
ysr@777 | 605 | // Set all cards back to clean. |
ysr@777 | 606 | _g1->cleanUpCardTable(); |
ysr@777 | 607 | if (ParallelGCThreads > 0) { |
ysr@777 | 608 | ConcurrentG1Refine* cg1r = _g1->concurrent_g1_refine(); |
ysr@777 | 609 | if (cg1r->do_traversal()) { |
ysr@777 | 610 | cg1r->cg1rThread()->set_do_traversal(false); |
ysr@777 | 611 | } |
ysr@777 | 612 | for (uint i = 0; i < ParallelGCThreads; i++) { |
ysr@777 | 613 | delete _new_refs[i]; |
ysr@777 | 614 | } |
ysr@777 | 615 | set_par_traversal(false); |
ysr@777 | 616 | } |
ysr@777 | 617 | assert(!_par_traversal_in_progress, "Invariant between iterations."); |
ysr@777 | 618 | } |
ysr@777 | 619 | |
ysr@777 | 620 | class UpdateRSObjectClosure: public ObjectClosure { |
ysr@777 | 621 | UpdateRSOopClosure* _update_rs_oop_cl; |
ysr@777 | 622 | public: |
ysr@777 | 623 | UpdateRSObjectClosure(UpdateRSOopClosure* update_rs_oop_cl) : |
ysr@777 | 624 | _update_rs_oop_cl(update_rs_oop_cl) {} |
ysr@777 | 625 | void do_object(oop obj) { |
ysr@777 | 626 | obj->oop_iterate(_update_rs_oop_cl); |
ysr@777 | 627 | } |
ysr@777 | 628 | |
ysr@777 | 629 | }; |
ysr@777 | 630 | |
ysr@777 | 631 | class ScrubRSClosure: public HeapRegionClosure { |
ysr@777 | 632 | G1CollectedHeap* _g1h; |
ysr@777 | 633 | BitMap* _region_bm; |
ysr@777 | 634 | BitMap* _card_bm; |
ysr@777 | 635 | CardTableModRefBS* _ctbs; |
ysr@777 | 636 | public: |
ysr@777 | 637 | ScrubRSClosure(BitMap* region_bm, BitMap* card_bm) : |
ysr@777 | 638 | _g1h(G1CollectedHeap::heap()), |
ysr@777 | 639 | _region_bm(region_bm), _card_bm(card_bm), |
ysr@777 | 640 | _ctbs(NULL) |
ysr@777 | 641 | { |
ysr@777 | 642 | ModRefBarrierSet* bs = _g1h->mr_bs(); |
ysr@777 | 643 | guarantee(bs->is_a(BarrierSet::CardTableModRef), "Precondition"); |
ysr@777 | 644 | _ctbs = (CardTableModRefBS*)bs; |
ysr@777 | 645 | } |
ysr@777 | 646 | |
ysr@777 | 647 | bool doHeapRegion(HeapRegion* r) { |
ysr@777 | 648 | if (!r->continuesHumongous()) { |
ysr@777 | 649 | r->rem_set()->scrub(_ctbs, _region_bm, _card_bm); |
ysr@777 | 650 | } |
ysr@777 | 651 | return false; |
ysr@777 | 652 | } |
ysr@777 | 653 | }; |
ysr@777 | 654 | |
ysr@777 | 655 | void HRInto_G1RemSet::scrub(BitMap* region_bm, BitMap* card_bm) { |
ysr@777 | 656 | ScrubRSClosure scrub_cl(region_bm, card_bm); |
ysr@777 | 657 | _g1->heap_region_iterate(&scrub_cl); |
ysr@777 | 658 | } |
ysr@777 | 659 | |
ysr@777 | 660 | void HRInto_G1RemSet::scrub_par(BitMap* region_bm, BitMap* card_bm, |
ysr@777 | 661 | int worker_num, int claim_val) { |
ysr@777 | 662 | ScrubRSClosure scrub_cl(region_bm, card_bm); |
ysr@777 | 663 | _g1->heap_region_par_iterate_chunked(&scrub_cl, worker_num, claim_val); |
ysr@777 | 664 | } |
ysr@777 | 665 | |
ysr@777 | 666 | |
ysr@777 | 667 | class ConcRefineRegionClosure: public HeapRegionClosure { |
ysr@777 | 668 | G1CollectedHeap* _g1h; |
ysr@777 | 669 | CardTableModRefBS* _ctbs; |
ysr@777 | 670 | ConcurrentGCThread* _cgc_thrd; |
ysr@777 | 671 | ConcurrentG1Refine* _cg1r; |
ysr@777 | 672 | unsigned _cards_processed; |
ysr@777 | 673 | UpdateRSOopClosure _update_rs_oop_cl; |
ysr@777 | 674 | public: |
ysr@777 | 675 | ConcRefineRegionClosure(CardTableModRefBS* ctbs, |
ysr@777 | 676 | ConcurrentG1Refine* cg1r, |
ysr@777 | 677 | HRInto_G1RemSet* g1rs) : |
ysr@777 | 678 | _ctbs(ctbs), _cg1r(cg1r), _cgc_thrd(cg1r->cg1rThread()), |
ysr@777 | 679 | _update_rs_oop_cl(g1rs), _cards_processed(0), |
ysr@777 | 680 | _g1h(G1CollectedHeap::heap()) |
ysr@777 | 681 | {} |
ysr@777 | 682 | |
ysr@777 | 683 | bool doHeapRegion(HeapRegion* r) { |
ysr@777 | 684 | if (!r->in_collection_set() && |
ysr@777 | 685 | !r->continuesHumongous() && |
ysr@777 | 686 | !r->is_young()) { |
ysr@777 | 687 | _update_rs_oop_cl.set_from(r); |
ysr@777 | 688 | UpdateRSObjectClosure update_rs_obj_cl(&_update_rs_oop_cl); |
ysr@777 | 689 | |
ysr@777 | 690 | // For each run of dirty card in the region: |
ysr@777 | 691 | // 1) Clear the cards. |
ysr@777 | 692 | // 2) Process the range corresponding to the run, adding any |
ysr@777 | 693 | // necessary RS entries. |
ysr@777 | 694 | // 1 must precede 2, so that a concurrent modification redirties the |
ysr@777 | 695 | // card. If a processing attempt does not succeed, because it runs |
ysr@777 | 696 | // into an unparseable region, we will do binary search to find the |
ysr@777 | 697 | // beginning of the next parseable region. |
ysr@777 | 698 | HeapWord* startAddr = r->bottom(); |
ysr@777 | 699 | HeapWord* endAddr = r->used_region().end(); |
ysr@777 | 700 | HeapWord* lastAddr; |
ysr@777 | 701 | HeapWord* nextAddr; |
ysr@777 | 702 | |
ysr@777 | 703 | for (nextAddr = lastAddr = startAddr; |
ysr@777 | 704 | nextAddr < endAddr; |
ysr@777 | 705 | nextAddr = lastAddr) { |
ysr@777 | 706 | MemRegion dirtyRegion; |
ysr@777 | 707 | |
ysr@777 | 708 | // Get and clear dirty region from card table |
ysr@777 | 709 | MemRegion next_mr(nextAddr, endAddr); |
ysr@777 | 710 | dirtyRegion = |
ysr@777 | 711 | _ctbs->dirty_card_range_after_reset( |
ysr@777 | 712 | next_mr, |
ysr@777 | 713 | true, CardTableModRefBS::clean_card_val()); |
ysr@777 | 714 | assert(dirtyRegion.start() >= nextAddr, |
ysr@777 | 715 | "returned region inconsistent?"); |
ysr@777 | 716 | |
ysr@777 | 717 | if (!dirtyRegion.is_empty()) { |
ysr@777 | 718 | HeapWord* stop_point = |
ysr@777 | 719 | r->object_iterate_mem_careful(dirtyRegion, |
ysr@777 | 720 | &update_rs_obj_cl); |
ysr@777 | 721 | if (stop_point == NULL) { |
ysr@777 | 722 | lastAddr = dirtyRegion.end(); |
ysr@777 | 723 | _cards_processed += |
ysr@777 | 724 | (int) (dirtyRegion.word_size() / CardTableModRefBS::card_size_in_words); |
ysr@777 | 725 | } else { |
ysr@777 | 726 | // We're going to skip one or more cards that we can't parse. |
ysr@777 | 727 | HeapWord* next_parseable_card = |
ysr@777 | 728 | r->next_block_start_careful(stop_point); |
ysr@777 | 729 | // Round this up to a card boundary. |
ysr@777 | 730 | next_parseable_card = |
ysr@777 | 731 | _ctbs->addr_for(_ctbs->byte_after_const(next_parseable_card)); |
ysr@777 | 732 | // Now we invalidate the intervening cards so we'll see them |
ysr@777 | 733 | // again. |
ysr@777 | 734 | MemRegion remaining_dirty = |
ysr@777 | 735 | MemRegion(stop_point, dirtyRegion.end()); |
ysr@777 | 736 | MemRegion skipped = |
ysr@777 | 737 | MemRegion(stop_point, next_parseable_card); |
ysr@777 | 738 | _ctbs->invalidate(skipped.intersection(remaining_dirty)); |
ysr@777 | 739 | |
ysr@777 | 740 | // Now start up again where we can parse. |
ysr@777 | 741 | lastAddr = next_parseable_card; |
ysr@777 | 742 | |
ysr@777 | 743 | // Count how many we did completely. |
ysr@777 | 744 | _cards_processed += |
ysr@777 | 745 | (stop_point - dirtyRegion.start()) / |
ysr@777 | 746 | CardTableModRefBS::card_size_in_words; |
ysr@777 | 747 | } |
ysr@777 | 748 | // Allow interruption at regular intervals. |
ysr@777 | 749 | // (Might need to make them more regular, if we get big |
ysr@777 | 750 | // dirty regions.) |
ysr@777 | 751 | if (_cgc_thrd != NULL) { |
ysr@777 | 752 | if (_cgc_thrd->should_yield()) { |
ysr@777 | 753 | _cgc_thrd->yield(); |
ysr@777 | 754 | switch (_cg1r->get_pya()) { |
ysr@777 | 755 | case PYA_continue: |
ysr@777 | 756 | // This may have changed: re-read. |
ysr@777 | 757 | endAddr = r->used_region().end(); |
ysr@777 | 758 | continue; |
ysr@777 | 759 | case PYA_restart: case PYA_cancel: |
ysr@777 | 760 | return true; |
ysr@777 | 761 | } |
ysr@777 | 762 | } |
ysr@777 | 763 | } |
ysr@777 | 764 | } else { |
ysr@777 | 765 | break; |
ysr@777 | 766 | } |
ysr@777 | 767 | } |
ysr@777 | 768 | } |
ysr@777 | 769 | // A good yield opportunity. |
ysr@777 | 770 | if (_cgc_thrd != NULL) { |
ysr@777 | 771 | if (_cgc_thrd->should_yield()) { |
ysr@777 | 772 | _cgc_thrd->yield(); |
ysr@777 | 773 | switch (_cg1r->get_pya()) { |
ysr@777 | 774 | case PYA_restart: case PYA_cancel: |
ysr@777 | 775 | return true; |
ysr@777 | 776 | default: |
ysr@777 | 777 | break; |
ysr@777 | 778 | } |
ysr@777 | 779 | |
ysr@777 | 780 | } |
ysr@777 | 781 | } |
ysr@777 | 782 | return false; |
ysr@777 | 783 | } |
ysr@777 | 784 | |
ysr@777 | 785 | unsigned cards_processed() { return _cards_processed; } |
ysr@777 | 786 | }; |
ysr@777 | 787 | |
ysr@777 | 788 | |
ysr@777 | 789 | void HRInto_G1RemSet::concurrentRefinementPass(ConcurrentG1Refine* cg1r) { |
ysr@777 | 790 | ConcRefineRegionClosure cr_cl(ct_bs(), cg1r, this); |
ysr@777 | 791 | _g1->heap_region_iterate(&cr_cl); |
ysr@777 | 792 | _conc_refine_traversals++; |
ysr@777 | 793 | _conc_refine_cards += cr_cl.cards_processed(); |
ysr@777 | 794 | } |
ysr@777 | 795 | |
ysr@777 | 796 | static IntHistogram out_of_histo(50, 50); |
ysr@777 | 797 | |
ysr@777 | 798 | |
ysr@777 | 799 | |
ysr@777 | 800 | void HRInto_G1RemSet::concurrentRefineOneCard(jbyte* card_ptr, int worker_i) { |
ysr@777 | 801 | // If the card is no longer dirty, nothing to do. |
ysr@777 | 802 | if (*card_ptr != CardTableModRefBS::dirty_card_val()) return; |
ysr@777 | 803 | |
ysr@777 | 804 | // Construct the region representing the card. |
ysr@777 | 805 | HeapWord* start = _ct_bs->addr_for(card_ptr); |
ysr@777 | 806 | // And find the region containing it. |
ysr@777 | 807 | HeapRegion* r = _g1->heap_region_containing(start); |
ysr@777 | 808 | if (r == NULL) { |
ysr@777 | 809 | guarantee(_g1->is_in_permanent(start), "Or else where?"); |
ysr@777 | 810 | return; // Not in the G1 heap (might be in perm, for example.) |
ysr@777 | 811 | } |
ysr@777 | 812 | // Why do we have to check here whether a card is on a young region, |
ysr@777 | 813 | // given that we dirty young regions and, as a result, the |
ysr@777 | 814 | // post-barrier is supposed to filter them out and never to enqueue |
ysr@777 | 815 | // them? When we allocate a new region as the "allocation region" we |
ysr@777 | 816 | // actually dirty its cards after we release the lock, since card |
ysr@777 | 817 | // dirtying while holding the lock was a performance bottleneck. So, |
ysr@777 | 818 | // as a result, it is possible for other threads to actually |
ysr@777 | 819 | // allocate objects in the region (after the acquire the lock) |
ysr@777 | 820 | // before all the cards on the region are dirtied. This is unlikely, |
ysr@777 | 821 | // and it doesn't happen often, but it can happen. So, the extra |
ysr@777 | 822 | // check below filters out those cards. |
ysr@777 | 823 | if (r->is_young()) { |
ysr@777 | 824 | return; |
ysr@777 | 825 | } |
ysr@777 | 826 | // While we are processing RSet buffers during the collection, we |
ysr@777 | 827 | // actually don't want to scan any cards on the collection set, |
ysr@777 | 828 | // since we don't want to update remebered sets with entries that |
ysr@777 | 829 | // point into the collection set, given that live objects from the |
ysr@777 | 830 | // collection set are about to move and such entries will be stale |
ysr@777 | 831 | // very soon. This change also deals with a reliability issue which |
ysr@777 | 832 | // involves scanning a card in the collection set and coming across |
ysr@777 | 833 | // an array that was being chunked and looking malformed. Note, |
ysr@777 | 834 | // however, that if evacuation fails, we have to scan any objects |
ysr@777 | 835 | // that were not moved and create any missing entries. |
ysr@777 | 836 | if (r->in_collection_set()) { |
ysr@777 | 837 | return; |
ysr@777 | 838 | } |
ysr@777 | 839 | |
ysr@777 | 840 | // Should we defer it? |
ysr@777 | 841 | if (_cg1r->use_cache()) { |
ysr@777 | 842 | card_ptr = _cg1r->cache_insert(card_ptr); |
ysr@777 | 843 | // If it was not an eviction, nothing to do. |
ysr@777 | 844 | if (card_ptr == NULL) return; |
ysr@777 | 845 | |
ysr@777 | 846 | // OK, we have to reset the card start, region, etc. |
ysr@777 | 847 | start = _ct_bs->addr_for(card_ptr); |
ysr@777 | 848 | r = _g1->heap_region_containing(start); |
ysr@777 | 849 | if (r == NULL) { |
ysr@777 | 850 | guarantee(_g1->is_in_permanent(start), "Or else where?"); |
ysr@777 | 851 | return; // Not in the G1 heap (might be in perm, for example.) |
ysr@777 | 852 | } |
ysr@777 | 853 | guarantee(!r->is_young(), "It was evicted in the current minor cycle."); |
ysr@777 | 854 | } |
ysr@777 | 855 | |
ysr@777 | 856 | HeapWord* end = _ct_bs->addr_for(card_ptr + 1); |
ysr@777 | 857 | MemRegion dirtyRegion(start, end); |
ysr@777 | 858 | |
ysr@777 | 859 | #if CARD_REPEAT_HISTO |
ysr@777 | 860 | init_ct_freq_table(_g1->g1_reserved_obj_bytes()); |
ysr@777 | 861 | ct_freq_note_card(_ct_bs->index_for(start)); |
ysr@777 | 862 | #endif |
ysr@777 | 863 | |
ysr@777 | 864 | UpdateRSOopClosure update_rs_oop_cl(this, worker_i); |
ysr@777 | 865 | update_rs_oop_cl.set_from(r); |
ysr@777 | 866 | FilterOutOfRegionClosure filter_then_update_rs_oop_cl(r, &update_rs_oop_cl); |
ysr@777 | 867 | |
ysr@777 | 868 | // Undirty the card. |
ysr@777 | 869 | *card_ptr = CardTableModRefBS::clean_card_val(); |
ysr@777 | 870 | // We must complete this write before we do any of the reads below. |
ysr@777 | 871 | OrderAccess::storeload(); |
ysr@777 | 872 | // And process it, being careful of unallocated portions of TLAB's. |
ysr@777 | 873 | HeapWord* stop_point = |
ysr@777 | 874 | r->oops_on_card_seq_iterate_careful(dirtyRegion, |
ysr@777 | 875 | &filter_then_update_rs_oop_cl); |
ysr@777 | 876 | // If stop_point is non-null, then we encountered an unallocated region |
ysr@777 | 877 | // (perhaps the unfilled portion of a TLAB.) For now, we'll dirty the |
ysr@777 | 878 | // card and re-enqueue: if we put off the card until a GC pause, then the |
ysr@777 | 879 | // unallocated portion will be filled in. Alternatively, we might try |
ysr@777 | 880 | // the full complexity of the technique used in "regular" precleaning. |
ysr@777 | 881 | if (stop_point != NULL) { |
ysr@777 | 882 | // The card might have gotten re-dirtied and re-enqueued while we |
ysr@777 | 883 | // worked. (In fact, it's pretty likely.) |
ysr@777 | 884 | if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
ysr@777 | 885 | *card_ptr = CardTableModRefBS::dirty_card_val(); |
ysr@777 | 886 | MutexLockerEx x(Shared_DirtyCardQ_lock, |
ysr@777 | 887 | Mutex::_no_safepoint_check_flag); |
ysr@777 | 888 | DirtyCardQueue* sdcq = |
ysr@777 | 889 | JavaThread::dirty_card_queue_set().shared_dirty_card_queue(); |
ysr@777 | 890 | sdcq->enqueue(card_ptr); |
ysr@777 | 891 | } |
ysr@777 | 892 | } else { |
ysr@777 | 893 | out_of_histo.add_entry(filter_then_update_rs_oop_cl.out_of_region()); |
ysr@777 | 894 | _conc_refine_cards++; |
ysr@777 | 895 | } |
ysr@777 | 896 | } |
ysr@777 | 897 | |
ysr@777 | 898 | class HRRSStatsIter: public HeapRegionClosure { |
ysr@777 | 899 | size_t _occupied; |
ysr@777 | 900 | size_t _total_mem_sz; |
ysr@777 | 901 | size_t _max_mem_sz; |
ysr@777 | 902 | HeapRegion* _max_mem_sz_region; |
ysr@777 | 903 | public: |
ysr@777 | 904 | HRRSStatsIter() : |
ysr@777 | 905 | _occupied(0), |
ysr@777 | 906 | _total_mem_sz(0), |
ysr@777 | 907 | _max_mem_sz(0), |
ysr@777 | 908 | _max_mem_sz_region(NULL) |
ysr@777 | 909 | {} |
ysr@777 | 910 | |
ysr@777 | 911 | bool doHeapRegion(HeapRegion* r) { |
ysr@777 | 912 | if (r->continuesHumongous()) return false; |
ysr@777 | 913 | size_t mem_sz = r->rem_set()->mem_size(); |
ysr@777 | 914 | if (mem_sz > _max_mem_sz) { |
ysr@777 | 915 | _max_mem_sz = mem_sz; |
ysr@777 | 916 | _max_mem_sz_region = r; |
ysr@777 | 917 | } |
ysr@777 | 918 | _total_mem_sz += mem_sz; |
ysr@777 | 919 | size_t occ = r->rem_set()->occupied(); |
ysr@777 | 920 | _occupied += occ; |
ysr@777 | 921 | return false; |
ysr@777 | 922 | } |
ysr@777 | 923 | size_t total_mem_sz() { return _total_mem_sz; } |
ysr@777 | 924 | size_t max_mem_sz() { return _max_mem_sz; } |
ysr@777 | 925 | size_t occupied() { return _occupied; } |
ysr@777 | 926 | HeapRegion* max_mem_sz_region() { return _max_mem_sz_region; } |
ysr@777 | 927 | }; |
ysr@777 | 928 | |
ysr@777 | 929 | void HRInto_G1RemSet::print_summary_info() { |
ysr@777 | 930 | G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
ysr@777 | 931 | ConcurrentG1RefineThread* cg1r_thrd = |
ysr@777 | 932 | g1->concurrent_g1_refine()->cg1rThread(); |
ysr@777 | 933 | |
ysr@777 | 934 | #if CARD_REPEAT_HISTO |
ysr@777 | 935 | gclog_or_tty->print_cr("\nG1 card_repeat count histogram: "); |
ysr@777 | 936 | gclog_or_tty->print_cr(" # of repeats --> # of cards with that number."); |
ysr@777 | 937 | card_repeat_count.print_on(gclog_or_tty); |
ysr@777 | 938 | #endif |
ysr@777 | 939 | |
ysr@777 | 940 | if (FILTEROUTOFREGIONCLOSURE_DOHISTOGRAMCOUNT) { |
ysr@777 | 941 | gclog_or_tty->print_cr("\nG1 rem-set out-of-region histogram: "); |
ysr@777 | 942 | gclog_or_tty->print_cr(" # of CS ptrs --> # of cards with that number."); |
ysr@777 | 943 | out_of_histo.print_on(gclog_or_tty); |
ysr@777 | 944 | } |
ysr@777 | 945 | gclog_or_tty->print_cr("\n Concurrent RS processed %d cards in " |
ysr@777 | 946 | "%5.2fs.", |
ysr@777 | 947 | _conc_refine_cards, cg1r_thrd->vtime_accum()); |
ysr@777 | 948 | |
ysr@777 | 949 | DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
ysr@777 | 950 | jint tot_processed_buffers = |
ysr@777 | 951 | dcqs.processed_buffers_mut() + dcqs.processed_buffers_rs_thread(); |
ysr@777 | 952 | gclog_or_tty->print_cr(" Of %d completed buffers:", tot_processed_buffers); |
ysr@777 | 953 | gclog_or_tty->print_cr(" %8d (%5.1f%%) by conc RS thread.", |
ysr@777 | 954 | dcqs.processed_buffers_rs_thread(), |
ysr@777 | 955 | 100.0*(float)dcqs.processed_buffers_rs_thread()/ |
ysr@777 | 956 | (float)tot_processed_buffers); |
ysr@777 | 957 | gclog_or_tty->print_cr(" %8d (%5.1f%%) by mutator threads.", |
ysr@777 | 958 | dcqs.processed_buffers_mut(), |
ysr@777 | 959 | 100.0*(float)dcqs.processed_buffers_mut()/ |
ysr@777 | 960 | (float)tot_processed_buffers); |
ysr@777 | 961 | gclog_or_tty->print_cr(" Did %d concurrent refinement traversals.", |
ysr@777 | 962 | _conc_refine_traversals); |
ysr@777 | 963 | if (!G1RSBarrierUseQueue) { |
ysr@777 | 964 | gclog_or_tty->print_cr(" Scanned %8.2f cards/traversal.", |
ysr@777 | 965 | _conc_refine_traversals > 0 ? |
ysr@777 | 966 | (float)_conc_refine_cards/(float)_conc_refine_traversals : |
ysr@777 | 967 | 0); |
ysr@777 | 968 | } |
ysr@777 | 969 | gclog_or_tty->print_cr(""); |
ysr@777 | 970 | if (G1UseHRIntoRS) { |
ysr@777 | 971 | HRRSStatsIter blk; |
ysr@777 | 972 | g1->heap_region_iterate(&blk); |
ysr@777 | 973 | gclog_or_tty->print_cr(" Total heap region rem set sizes = " SIZE_FORMAT "K." |
ysr@777 | 974 | " Max = " SIZE_FORMAT "K.", |
ysr@777 | 975 | blk.total_mem_sz()/K, blk.max_mem_sz()/K); |
ysr@777 | 976 | gclog_or_tty->print_cr(" Static structures = " SIZE_FORMAT "K," |
ysr@777 | 977 | " free_lists = " SIZE_FORMAT "K.", |
ysr@777 | 978 | HeapRegionRemSet::static_mem_size()/K, |
ysr@777 | 979 | HeapRegionRemSet::fl_mem_size()/K); |
ysr@777 | 980 | gclog_or_tty->print_cr(" %d occupied cards represented.", |
ysr@777 | 981 | blk.occupied()); |
ysr@777 | 982 | gclog_or_tty->print_cr(" Max sz region = [" PTR_FORMAT ", " PTR_FORMAT " )" |
ysr@777 | 983 | " %s, cap = " SIZE_FORMAT "K, occ = " SIZE_FORMAT "K.", |
ysr@777 | 984 | blk.max_mem_sz_region()->bottom(), blk.max_mem_sz_region()->end(), |
ysr@777 | 985 | (blk.max_mem_sz_region()->popular() ? "POP" : ""), |
ysr@777 | 986 | (blk.max_mem_sz_region()->rem_set()->mem_size() + K - 1)/K, |
ysr@777 | 987 | (blk.max_mem_sz_region()->rem_set()->occupied() + K - 1)/K); |
ysr@777 | 988 | gclog_or_tty->print_cr(" Did %d coarsenings.", |
ysr@777 | 989 | HeapRegionRemSet::n_coarsenings()); |
ysr@777 | 990 | |
ysr@777 | 991 | } |
ysr@777 | 992 | } |
ysr@777 | 993 | void HRInto_G1RemSet::prepare_for_verify() { |
ysr@777 | 994 | if (G1HRRSFlushLogBuffersOnVerify && VerifyBeforeGC && !_g1->full_collection()) { |
ysr@777 | 995 | cleanupHRRS(); |
ysr@777 | 996 | _g1->set_refine_cte_cl_concurrency(false); |
ysr@777 | 997 | if (SafepointSynchronize::is_at_safepoint()) { |
ysr@777 | 998 | DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
ysr@777 | 999 | dcqs.concatenate_logs(); |
ysr@777 | 1000 | } |
ysr@777 | 1001 | bool cg1r_use_cache = _cg1r->use_cache(); |
ysr@777 | 1002 | _cg1r->set_use_cache(false); |
ysr@777 | 1003 | updateRS(0); |
ysr@777 | 1004 | _cg1r->set_use_cache(cg1r_use_cache); |
ysr@777 | 1005 | } |
ysr@777 | 1006 | } |