Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1RemSet.cpp @ 2351:8e72cd29b15d
6589823: Error: meet not symmetric
Summary: arrays pointers meet must fall to bottom if exact array klasses in upper lattice are not equal or super klass is exact.
Reviewed-by: never
author | kvn |
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date | Sat, 05 Mar 2011 11:02:04 -0800 |
parents | c33825b68624 |
children | 1216415d8e35 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/bufferingOopClosure.hpp" | |
27 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
28 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" | |
29 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
31 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
32 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
33 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
34 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
35 #include "memory/iterator.hpp" | |
36 #include "oops/oop.inline.hpp" | |
37 #include "utilities/intHisto.hpp" | |
342 | 38 |
39 #define CARD_REPEAT_HISTO 0 | |
40 | |
41 #if CARD_REPEAT_HISTO | |
42 static size_t ct_freq_sz; | |
43 static jbyte* ct_freq = NULL; | |
44 | |
45 void init_ct_freq_table(size_t heap_sz_bytes) { | |
46 if (ct_freq == NULL) { | |
47 ct_freq_sz = heap_sz_bytes/CardTableModRefBS::card_size; | |
48 ct_freq = new jbyte[ct_freq_sz]; | |
49 for (size_t j = 0; j < ct_freq_sz; j++) ct_freq[j] = 0; | |
50 } | |
51 } | |
52 | |
53 void ct_freq_note_card(size_t index) { | |
54 assert(0 <= index && index < ct_freq_sz, "Bounds error."); | |
55 if (ct_freq[index] < 100) { ct_freq[index]++; } | |
56 } | |
57 | |
58 static IntHistogram card_repeat_count(10, 10); | |
59 | |
60 void ct_freq_update_histo_and_reset() { | |
61 for (size_t j = 0; j < ct_freq_sz; j++) { | |
62 card_repeat_count.add_entry(ct_freq[j]); | |
63 ct_freq[j] = 0; | |
64 } | |
65 | |
66 } | |
67 #endif | |
68 | |
69 | |
70 class IntoCSOopClosure: public OopsInHeapRegionClosure { | |
71 OopsInHeapRegionClosure* _blk; | |
72 G1CollectedHeap* _g1; | |
73 public: | |
74 IntoCSOopClosure(G1CollectedHeap* g1, OopsInHeapRegionClosure* blk) : | |
75 _g1(g1), _blk(blk) {} | |
76 void set_region(HeapRegion* from) { | |
77 _blk->set_region(from); | |
78 } | |
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79 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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80 virtual void do_oop( oop* p) { do_oop_work(p); } |
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81 template <class T> void do_oop_work(T* p) { |
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82 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 83 if (_g1->obj_in_cs(obj)) _blk->do_oop(p); |
84 } | |
85 bool apply_to_weak_ref_discovered_field() { return true; } | |
86 bool idempotent() { return true; } | |
87 }; | |
88 | |
89 class IntoCSRegionClosure: public HeapRegionClosure { | |
90 IntoCSOopClosure _blk; | |
91 G1CollectedHeap* _g1; | |
92 public: | |
93 IntoCSRegionClosure(G1CollectedHeap* g1, OopsInHeapRegionClosure* blk) : | |
94 _g1(g1), _blk(g1, blk) {} | |
95 bool doHeapRegion(HeapRegion* r) { | |
96 if (!r->in_collection_set()) { | |
97 _blk.set_region(r); | |
98 if (r->isHumongous()) { | |
99 if (r->startsHumongous()) { | |
100 oop obj = oop(r->bottom()); | |
101 obj->oop_iterate(&_blk); | |
102 } | |
103 } else { | |
104 r->oop_before_save_marks_iterate(&_blk); | |
105 } | |
106 } | |
107 return false; | |
108 } | |
109 }; | |
110 | |
111 class VerifyRSCleanCardOopClosure: public OopClosure { | |
112 G1CollectedHeap* _g1; | |
113 public: | |
114 VerifyRSCleanCardOopClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
115 | |
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116 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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117 virtual void do_oop( oop* p) { do_oop_work(p); } |
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118 template <class T> void do_oop_work(T* p) { |
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119 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 120 HeapRegion* to = _g1->heap_region_containing(obj); |
121 guarantee(to == NULL || !to->in_collection_set(), | |
122 "Missed a rem set member."); | |
123 } | |
124 }; | |
125 | |
1861 | 126 G1RemSet::G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs) |
127 : _g1(g1), _conc_refine_cards(0), | |
128 _ct_bs(ct_bs), _g1p(_g1->g1_policy()), | |
342 | 129 _cg1r(g1->concurrent_g1_refine()), |
1705 | 130 _cset_rs_update_cl(NULL), |
342 | 131 _cards_scanned(NULL), _total_cards_scanned(0) |
132 { | |
133 _seq_task = new SubTasksDone(NumSeqTasks); | |
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134 guarantee(n_workers() > 0, "There should be some workers"); |
1705 | 135 _cset_rs_update_cl = NEW_C_HEAP_ARRAY(OopsInHeapRegionClosure*, n_workers()); |
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136 for (uint i = 0; i < n_workers(); i++) { |
1705 | 137 _cset_rs_update_cl[i] = NULL; |
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138 } |
342 | 139 } |
140 | |
1861 | 141 G1RemSet::~G1RemSet() { |
342 | 142 delete _seq_task; |
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143 for (uint i = 0; i < n_workers(); i++) { |
1705 | 144 assert(_cset_rs_update_cl[i] == NULL, "it should be"); |
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145 } |
1705 | 146 FREE_C_HEAP_ARRAY(OopsInHeapRegionClosure*, _cset_rs_update_cl); |
342 | 147 } |
148 | |
149 void CountNonCleanMemRegionClosure::do_MemRegion(MemRegion mr) { | |
150 if (_g1->is_in_g1_reserved(mr.start())) { | |
151 _n += (int) ((mr.byte_size() / CardTableModRefBS::card_size)); | |
152 if (_start_first == NULL) _start_first = mr.start(); | |
153 } | |
154 } | |
155 | |
156 class ScanRSClosure : public HeapRegionClosure { | |
157 size_t _cards_done, _cards; | |
158 G1CollectedHeap* _g1h; | |
159 OopsInHeapRegionClosure* _oc; | |
160 G1BlockOffsetSharedArray* _bot_shared; | |
161 CardTableModRefBS *_ct_bs; | |
162 int _worker_i; | |
1261 | 163 int _block_size; |
342 | 164 bool _try_claimed; |
165 public: | |
166 ScanRSClosure(OopsInHeapRegionClosure* oc, int worker_i) : | |
167 _oc(oc), | |
168 _cards(0), | |
169 _cards_done(0), | |
170 _worker_i(worker_i), | |
171 _try_claimed(false) | |
172 { | |
173 _g1h = G1CollectedHeap::heap(); | |
174 _bot_shared = _g1h->bot_shared(); | |
175 _ct_bs = (CardTableModRefBS*) (_g1h->barrier_set()); | |
1261 | 176 _block_size = MAX2<int>(G1RSetScanBlockSize, 1); |
342 | 177 } |
178 | |
179 void set_try_claimed() { _try_claimed = true; } | |
180 | |
181 void scanCard(size_t index, HeapRegion *r) { | |
182 _cards_done++; | |
183 DirtyCardToOopClosure* cl = | |
184 r->new_dcto_closure(_oc, | |
185 CardTableModRefBS::Precise, | |
186 HeapRegionDCTOC::IntoCSFilterKind); | |
187 | |
188 // Set the "from" region in the closure. | |
189 _oc->set_region(r); | |
190 HeapWord* card_start = _bot_shared->address_for_index(index); | |
191 HeapWord* card_end = card_start + G1BlockOffsetSharedArray::N_words; | |
192 Space *sp = SharedHeap::heap()->space_containing(card_start); | |
193 MemRegion sm_region; | |
194 if (ParallelGCThreads > 0) { | |
195 // first find the used area | |
196 sm_region = sp->used_region_at_save_marks(); | |
197 } else { | |
198 // The closure is not idempotent. We shouldn't look at objects | |
199 // allocated during the GC. | |
200 sm_region = sp->used_region_at_save_marks(); | |
201 } | |
202 MemRegion mr = sm_region.intersection(MemRegion(card_start,card_end)); | |
203 if (!mr.is_empty()) { | |
204 cl->do_MemRegion(mr); | |
205 } | |
206 } | |
207 | |
208 void printCard(HeapRegion* card_region, size_t card_index, | |
209 HeapWord* card_start) { | |
210 gclog_or_tty->print_cr("T %d Region [" PTR_FORMAT ", " PTR_FORMAT ") " | |
211 "RS names card %p: " | |
212 "[" PTR_FORMAT ", " PTR_FORMAT ")", | |
213 _worker_i, | |
214 card_region->bottom(), card_region->end(), | |
215 card_index, | |
216 card_start, card_start + G1BlockOffsetSharedArray::N_words); | |
217 } | |
218 | |
219 bool doHeapRegion(HeapRegion* r) { | |
220 assert(r->in_collection_set(), "should only be called on elements of CS."); | |
221 HeapRegionRemSet* hrrs = r->rem_set(); | |
222 if (hrrs->iter_is_complete()) return false; // All done. | |
223 if (!_try_claimed && !hrrs->claim_iter()) return false; | |
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224 _g1h->push_dirty_cards_region(r); |
342 | 225 // If we didn't return above, then |
226 // _try_claimed || r->claim_iter() | |
227 // is true: either we're supposed to work on claimed-but-not-complete | |
228 // regions, or we successfully claimed the region. | |
229 HeapRegionRemSetIterator* iter = _g1h->rem_set_iterator(_worker_i); | |
230 hrrs->init_iterator(iter); | |
231 size_t card_index; | |
1261 | 232 |
233 // We claim cards in block so as to recude the contention. The block size is determined by | |
234 // the G1RSetScanBlockSize parameter. | |
235 size_t jump_to_card = hrrs->iter_claimed_next(_block_size); | |
236 for (size_t current_card = 0; iter->has_next(card_index); current_card++) { | |
237 if (current_card >= jump_to_card + _block_size) { | |
238 jump_to_card = hrrs->iter_claimed_next(_block_size); | |
747 | 239 } |
1261 | 240 if (current_card < jump_to_card) continue; |
342 | 241 HeapWord* card_start = _g1h->bot_shared()->address_for_index(card_index); |
242 #if 0 | |
243 gclog_or_tty->print("Rem set iteration yielded card [" PTR_FORMAT ", " PTR_FORMAT ").\n", | |
244 card_start, card_start + CardTableModRefBS::card_size_in_words); | |
245 #endif | |
246 | |
247 HeapRegion* card_region = _g1h->heap_region_containing(card_start); | |
248 assert(card_region != NULL, "Yielding cards not in the heap?"); | |
249 _cards++; | |
250 | |
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251 if (!card_region->is_on_dirty_cards_region_list()) { |
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252 _g1h->push_dirty_cards_region(card_region); |
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253 } |
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254 |
747 | 255 // If the card is dirty, then we will scan it during updateRS. |
256 if (!card_region->in_collection_set() && !_ct_bs->is_card_dirty(card_index)) { | |
1261 | 257 // We make the card as "claimed" lazily (so races are possible but they're benign), |
258 // which reduces the number of duplicate scans (the rsets of the regions in the cset | |
259 // can intersect). | |
260 if (!_ct_bs->is_card_claimed(card_index)) { | |
261 _ct_bs->set_card_claimed(card_index); | |
262 scanCard(card_index, card_region); | |
263 } | |
342 | 264 } |
265 } | |
747 | 266 if (!_try_claimed) { |
267 hrrs->set_iter_complete(); | |
268 } | |
342 | 269 return false; |
270 } | |
271 // Set all cards back to clean. | |
272 void cleanup() {_g1h->cleanUpCardTable();} | |
273 size_t cards_done() { return _cards_done;} | |
274 size_t cards_looked_up() { return _cards;} | |
275 }; | |
276 | |
277 // We want the parallel threads to start their scanning at | |
278 // different collection set regions to avoid contention. | |
279 // If we have: | |
280 // n collection set regions | |
281 // p threads | |
282 // Then thread t will start at region t * floor (n/p) | |
283 | |
1861 | 284 HeapRegion* G1RemSet::calculateStartRegion(int worker_i) { |
342 | 285 HeapRegion* result = _g1p->collection_set(); |
286 if (ParallelGCThreads > 0) { | |
287 size_t cs_size = _g1p->collection_set_size(); | |
288 int n_workers = _g1->workers()->total_workers(); | |
289 size_t cs_spans = cs_size / n_workers; | |
290 size_t ind = cs_spans * worker_i; | |
291 for (size_t i = 0; i < ind; i++) | |
292 result = result->next_in_collection_set(); | |
293 } | |
294 return result; | |
295 } | |
296 | |
1861 | 297 void G1RemSet::scanRS(OopsInHeapRegionClosure* oc, int worker_i) { |
342 | 298 double rs_time_start = os::elapsedTime(); |
299 HeapRegion *startRegion = calculateStartRegion(worker_i); | |
300 | |
1261 | 301 ScanRSClosure scanRScl(oc, worker_i); |
342 | 302 _g1->collection_set_iterate_from(startRegion, &scanRScl); |
303 scanRScl.set_try_claimed(); | |
304 _g1->collection_set_iterate_from(startRegion, &scanRScl); | |
305 | |
1261 | 306 double scan_rs_time_sec = os::elapsedTime() - rs_time_start; |
342 | 307 |
308 assert( _cards_scanned != NULL, "invariant" ); | |
309 _cards_scanned[worker_i] = scanRScl.cards_done(); | |
310 | |
311 _g1p->record_scan_rs_time(worker_i, scan_rs_time_sec * 1000.0); | |
312 } | |
313 | |
1705 | 314 // Closure used for updating RSets and recording references that |
315 // point into the collection set. Only called during an | |
316 // evacuation pause. | |
317 | |
318 class RefineRecordRefsIntoCSCardTableEntryClosure: public CardTableEntryClosure { | |
319 G1RemSet* _g1rs; | |
320 DirtyCardQueue* _into_cset_dcq; | |
321 public: | |
322 RefineRecordRefsIntoCSCardTableEntryClosure(G1CollectedHeap* g1h, | |
323 DirtyCardQueue* into_cset_dcq) : | |
324 _g1rs(g1h->g1_rem_set()), _into_cset_dcq(into_cset_dcq) | |
325 {} | |
326 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
327 // The only time we care about recording cards that | |
328 // contain references that point into the collection set | |
329 // is during RSet updating within an evacuation pause. | |
330 // In this case worker_i should be the id of a GC worker thread. | |
331 assert(SafepointSynchronize::is_at_safepoint(), "not during an evacuation pause"); | |
332 assert(worker_i < (int) DirtyCardQueueSet::num_par_ids(), "should be a GC worker"); | |
342 | 333 |
1705 | 334 if (_g1rs->concurrentRefineOneCard(card_ptr, worker_i, true)) { |
335 // 'card_ptr' contains references that point into the collection | |
336 // set. We need to record the card in the DCQS | |
337 // (G1CollectedHeap::into_cset_dirty_card_queue_set()) | |
338 // that's used for that purpose. | |
339 // | |
340 // Enqueue the card | |
341 _into_cset_dcq->enqueue(card_ptr); | |
342 } | |
343 return true; | |
344 } | |
345 }; | |
346 | |
1861 | 347 void G1RemSet::updateRS(DirtyCardQueue* into_cset_dcq, int worker_i) { |
342 | 348 double start = os::elapsedTime(); |
1705 | 349 // Apply the given closure to all remaining log entries. |
350 RefineRecordRefsIntoCSCardTableEntryClosure into_cset_update_rs_cl(_g1, into_cset_dcq); | |
351 _g1->iterate_dirty_card_closure(&into_cset_update_rs_cl, into_cset_dcq, false, worker_i); | |
352 | |
794 | 353 // Now there should be no dirty cards. |
354 if (G1RSLogCheckCardTable) { | |
355 CountNonCleanMemRegionClosure cl(_g1); | |
356 _ct_bs->mod_card_iterate(&cl); | |
357 // XXX This isn't true any more: keeping cards of young regions | |
358 // marked dirty broke it. Need some reasonable fix. | |
359 guarantee(cl.n() == 0, "Card table should be clean."); | |
342 | 360 } |
794 | 361 |
342 | 362 _g1p->record_update_rs_time(worker_i, (os::elapsedTime() - start) * 1000.0); |
363 } | |
364 | |
365 #ifndef PRODUCT | |
366 class PrintRSClosure : public HeapRegionClosure { | |
367 int _count; | |
368 public: | |
369 PrintRSClosure() : _count(0) {} | |
370 bool doHeapRegion(HeapRegion* r) { | |
371 HeapRegionRemSet* hrrs = r->rem_set(); | |
372 _count += (int) hrrs->occupied(); | |
373 if (hrrs->occupied() == 0) { | |
374 gclog_or_tty->print("Heap Region [" PTR_FORMAT ", " PTR_FORMAT ") " | |
375 "has no remset entries\n", | |
376 r->bottom(), r->end()); | |
377 } else { | |
378 gclog_or_tty->print("Printing rem set for heap region [" PTR_FORMAT ", " PTR_FORMAT ")\n", | |
379 r->bottom(), r->end()); | |
380 r->print(); | |
381 hrrs->print(); | |
382 gclog_or_tty->print("\nDone printing rem set\n"); | |
383 } | |
384 return false; | |
385 } | |
386 int occupied() {return _count;} | |
387 }; | |
388 #endif | |
389 | |
390 class CountRSSizeClosure: public HeapRegionClosure { | |
391 size_t _n; | |
392 size_t _tot; | |
393 size_t _max; | |
394 HeapRegion* _max_r; | |
395 enum { | |
396 N = 20, | |
397 MIN = 6 | |
398 }; | |
399 int _histo[N]; | |
400 public: | |
401 CountRSSizeClosure() : _n(0), _tot(0), _max(0), _max_r(NULL) { | |
402 for (int i = 0; i < N; i++) _histo[i] = 0; | |
403 } | |
404 bool doHeapRegion(HeapRegion* r) { | |
405 if (!r->continuesHumongous()) { | |
406 size_t occ = r->rem_set()->occupied(); | |
407 _n++; | |
408 _tot += occ; | |
409 if (occ > _max) { | |
410 _max = occ; | |
411 _max_r = r; | |
412 } | |
413 // Fit it into a histo bin. | |
414 int s = 1 << MIN; | |
415 int i = 0; | |
416 while (occ > (size_t) s && i < (N-1)) { | |
417 s = s << 1; | |
418 i++; | |
419 } | |
420 _histo[i]++; | |
421 } | |
422 return false; | |
423 } | |
424 size_t n() { return _n; } | |
425 size_t tot() { return _tot; } | |
426 size_t mx() { return _max; } | |
427 HeapRegion* mxr() { return _max_r; } | |
428 void print_histo() { | |
429 int mx = N; | |
430 while (mx >= 0) { | |
431 if (_histo[mx-1] > 0) break; | |
432 mx--; | |
433 } | |
434 gclog_or_tty->print_cr("Number of regions with given RS sizes:"); | |
435 gclog_or_tty->print_cr(" <= %8d %8d", 1 << MIN, _histo[0]); | |
436 for (int i = 1; i < mx-1; i++) { | |
437 gclog_or_tty->print_cr(" %8d - %8d %8d", | |
438 (1 << (MIN + i - 1)) + 1, | |
439 1 << (MIN + i), | |
440 _histo[i]); | |
441 } | |
442 gclog_or_tty->print_cr(" > %8d %8d", (1 << (MIN+mx-2))+1, _histo[mx-1]); | |
443 } | |
444 }; | |
445 | |
1861 | 446 void G1RemSet::cleanupHRRS() { |
342 | 447 HeapRegionRemSet::cleanup(); |
448 } | |
449 | |
1861 | 450 void G1RemSet::oops_into_collection_set_do(OopsInHeapRegionClosure* oc, |
342 | 451 int worker_i) { |
452 #if CARD_REPEAT_HISTO | |
453 ct_freq_update_histo_and_reset(); | |
454 #endif | |
455 if (worker_i == 0) { | |
456 _cg1r->clear_and_record_card_counts(); | |
457 } | |
458 | |
459 // Make this into a command-line flag... | |
460 if (G1RSCountHisto && (ParallelGCThreads == 0 || worker_i == 0)) { | |
461 CountRSSizeClosure count_cl; | |
462 _g1->heap_region_iterate(&count_cl); | |
463 gclog_or_tty->print_cr("Avg of %d RS counts is %f, max is %d, " | |
464 "max region is " PTR_FORMAT, | |
465 count_cl.n(), (float)count_cl.tot()/(float)count_cl.n(), | |
466 count_cl.mx(), count_cl.mxr()); | |
467 count_cl.print_histo(); | |
468 } | |
469 | |
1705 | 470 // We cache the value of 'oc' closure into the appropriate slot in the |
471 // _cset_rs_update_cl for this worker | |
472 assert(worker_i < (int)n_workers(), "sanity"); | |
473 _cset_rs_update_cl[worker_i] = oc; | |
474 | |
475 // A DirtyCardQueue that is used to hold cards containing references | |
476 // that point into the collection set. This DCQ is associated with a | |
477 // special DirtyCardQueueSet (see g1CollectedHeap.hpp). Under normal | |
478 // circumstances (i.e. the pause successfully completes), these cards | |
479 // are just discarded (there's no need to update the RSets of regions | |
480 // that were in the collection set - after the pause these regions | |
481 // are wholly 'free' of live objects. In the event of an evacuation | |
482 // failure the cards/buffers in this queue set are: | |
483 // * passed to the DirtyCardQueueSet that is used to manage deferred | |
484 // RSet updates, or | |
485 // * scanned for references that point into the collection set | |
486 // and the RSet of the corresponding region in the collection set | |
487 // is updated immediately. | |
488 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); | |
489 | |
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490 assert((ParallelGCThreads > 0) || worker_i == 0, "invariant"); |
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491 |
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492 // The two flags below were introduced temporarily to serialize |
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493 // the updating and scanning of remembered sets. There are some |
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494 // race conditions when these two operations are done in parallel |
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495 // and they are causing failures. When we resolve said race |
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496 // conditions, we'll revert back to parallel remembered set |
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497 // updating and scanning. See CRs 6677707 and 6677708. |
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498 if (G1UseParallelRSetUpdating || (worker_i == 0)) { |
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499 updateRS(&into_cset_dcq, worker_i); |
342 | 500 } else { |
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501 _g1p->record_update_rs_processed_buffers(worker_i, 0.0); |
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502 _g1p->record_update_rs_time(worker_i, 0.0); |
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503 } |
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504 if (G1UseParallelRSetScanning || (worker_i == 0)) { |
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505 scanRS(oc, worker_i); |
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506 } else { |
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507 _g1p->record_scan_rs_time(worker_i, 0.0); |
342 | 508 } |
1705 | 509 |
510 // We now clear the cached values of _cset_rs_update_cl for this worker | |
511 _cset_rs_update_cl[worker_i] = NULL; | |
342 | 512 } |
513 | |
1861 | 514 void G1RemSet::prepare_for_oops_into_collection_set_do() { |
342 | 515 #if G1_REM_SET_LOGGING |
516 PrintRSClosure cl; | |
517 _g1->collection_set_iterate(&cl); | |
518 #endif | |
519 cleanupHRRS(); | |
520 ConcurrentG1Refine* cg1r = _g1->concurrent_g1_refine(); | |
521 _g1->set_refine_cte_cl_concurrency(false); | |
522 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
523 dcqs.concatenate_logs(); | |
524 | |
525 if (ParallelGCThreads > 0) { | |
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526 _seq_task->set_n_threads((int)n_workers()); |
342 | 527 } |
528 guarantee( _cards_scanned == NULL, "invariant" ); | |
529 _cards_scanned = NEW_C_HEAP_ARRAY(size_t, n_workers()); | |
545 | 530 for (uint i = 0; i < n_workers(); ++i) { |
531 _cards_scanned[i] = 0; | |
532 } | |
342 | 533 _total_cards_scanned = 0; |
534 } | |
535 | |
536 | |
537 class cleanUpIteratorsClosure : public HeapRegionClosure { | |
538 bool doHeapRegion(HeapRegion *r) { | |
539 HeapRegionRemSet* hrrs = r->rem_set(); | |
540 hrrs->init_for_par_iteration(); | |
541 return false; | |
542 } | |
543 }; | |
544 | |
1705 | 545 // This closure, applied to a DirtyCardQueueSet, is used to immediately |
546 // update the RSets for the regions in the CSet. For each card it iterates | |
547 // through the oops which coincide with that card. It scans the reference | |
548 // fields in each oop; when it finds an oop that points into the collection | |
549 // set, the RSet for the region containing the referenced object is updated. | |
550 class UpdateRSetCardTableEntryIntoCSetClosure: public CardTableEntryClosure { | |
616
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551 G1CollectedHeap* _g1; |
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552 CardTableModRefBS* _ct_bs; |
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553 public: |
1705 | 554 UpdateRSetCardTableEntryIntoCSetClosure(G1CollectedHeap* g1, |
555 CardTableModRefBS* bs): | |
556 _g1(g1), _ct_bs(bs) | |
557 { } | |
558 | |
559 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
560 // Construct the region representing the card. | |
561 HeapWord* start = _ct_bs->addr_for(card_ptr); | |
562 // And find the region containing it. | |
563 HeapRegion* r = _g1->heap_region_containing(start); | |
564 assert(r != NULL, "unexpected null"); | |
565 | |
566 // Scan oops in the card looking for references into the collection set | |
567 HeapWord* end = _ct_bs->addr_for(card_ptr + 1); | |
568 MemRegion scanRegion(start, end); | |
569 | |
570 UpdateRSetImmediate update_rs_cl(_g1->g1_rem_set()); | |
571 FilterIntoCSClosure update_rs_cset_oop_cl(NULL, _g1, &update_rs_cl); | |
572 FilterOutOfRegionClosure filter_then_update_rs_cset_oop_cl(r, &update_rs_cset_oop_cl); | |
573 | |
574 // We can pass false as the "filter_young" parameter here as: | |
575 // * we should be in a STW pause, | |
576 // * the DCQS to which this closure is applied is used to hold | |
577 // references that point into the collection set from the prior | |
578 // RSet updating, | |
579 // * the post-write barrier shouldn't be logging updates to young | |
580 // regions (but there is a situation where this can happen - see | |
1861 | 581 // the comment in G1RemSet::concurrentRefineOneCard below - |
1705 | 582 // that should not be applicable here), and |
583 // * during actual RSet updating, the filtering of cards in young | |
584 // regions in HeapRegion::oops_on_card_seq_iterate_careful is | |
585 // employed. | |
586 // As a result, when this closure is applied to "refs into cset" | |
587 // DCQS, we shouldn't see any cards in young regions. | |
588 update_rs_cl.set_region(r); | |
589 HeapWord* stop_point = | |
590 r->oops_on_card_seq_iterate_careful(scanRegion, | |
591 &filter_then_update_rs_cset_oop_cl, | |
592 false /* filter_young */); | |
593 | |
594 // Since this is performed in the event of an evacuation failure, we | |
595 // we shouldn't see a non-null stop point | |
596 assert(stop_point == NULL, "saw an unallocated region"); | |
597 return true; | |
616
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598 } |
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599 }; |
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600 |
1861 | 601 void G1RemSet::cleanup_after_oops_into_collection_set_do() { |
342 | 602 guarantee( _cards_scanned != NULL, "invariant" ); |
603 _total_cards_scanned = 0; | |
604 for (uint i = 0; i < n_workers(); ++i) | |
605 _total_cards_scanned += _cards_scanned[i]; | |
606 FREE_C_HEAP_ARRAY(size_t, _cards_scanned); | |
607 _cards_scanned = NULL; | |
608 // Cleanup after copy | |
609 #if G1_REM_SET_LOGGING | |
610 PrintRSClosure cl; | |
611 _g1->heap_region_iterate(&cl); | |
612 #endif | |
613 _g1->set_refine_cte_cl_concurrency(true); | |
614 cleanUpIteratorsClosure iterClosure; | |
615 _g1->collection_set_iterate(&iterClosure); | |
616 // Set all cards back to clean. | |
617 _g1->cleanUpCardTable(); | |
794 | 618 |
1705 | 619 DirtyCardQueueSet& into_cset_dcqs = _g1->into_cset_dirty_card_queue_set(); |
620 int into_cset_n_buffers = into_cset_dcqs.completed_buffers_num(); | |
621 | |
616
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622 if (_g1->evacuation_failed()) { |
1705 | 623 // Restore remembered sets for the regions pointing into the collection set. |
624 | |
616
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625 if (G1DeferredRSUpdate) { |
1705 | 626 // If deferred RS updates are enabled then we just need to transfer |
627 // the completed buffers from (a) the DirtyCardQueueSet used to hold | |
628 // cards that contain references that point into the collection set | |
629 // to (b) the DCQS used to hold the deferred RS updates | |
630 _g1->dirty_card_queue_set().merge_bufferlists(&into_cset_dcqs); | |
616
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631 } else { |
1705 | 632 |
633 CardTableModRefBS* bs = (CardTableModRefBS*)_g1->barrier_set(); | |
634 UpdateRSetCardTableEntryIntoCSetClosure update_rs_cset_immediate(_g1, bs); | |
635 | |
636 int n_completed_buffers = 0; | |
637 while (into_cset_dcqs.apply_closure_to_completed_buffer(&update_rs_cset_immediate, | |
638 0, 0, true)) { | |
639 n_completed_buffers++; | |
640 } | |
641 assert(n_completed_buffers == into_cset_n_buffers, "missed some buffers"); | |
616
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642 } |
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643 } |
1705 | 644 |
645 // Free any completed buffers in the DirtyCardQueueSet used to hold cards | |
646 // which contain references that point into the collection. | |
647 _g1->into_cset_dirty_card_queue_set().clear(); | |
648 assert(_g1->into_cset_dirty_card_queue_set().completed_buffers_num() == 0, | |
649 "all buffers should be freed"); | |
650 _g1->into_cset_dirty_card_queue_set().clear_n_completed_buffers(); | |
342 | 651 } |
652 | |
653 class ScrubRSClosure: public HeapRegionClosure { | |
654 G1CollectedHeap* _g1h; | |
655 BitMap* _region_bm; | |
656 BitMap* _card_bm; | |
657 CardTableModRefBS* _ctbs; | |
658 public: | |
659 ScrubRSClosure(BitMap* region_bm, BitMap* card_bm) : | |
660 _g1h(G1CollectedHeap::heap()), | |
661 _region_bm(region_bm), _card_bm(card_bm), | |
662 _ctbs(NULL) | |
663 { | |
664 ModRefBarrierSet* bs = _g1h->mr_bs(); | |
665 guarantee(bs->is_a(BarrierSet::CardTableModRef), "Precondition"); | |
666 _ctbs = (CardTableModRefBS*)bs; | |
667 } | |
668 | |
669 bool doHeapRegion(HeapRegion* r) { | |
670 if (!r->continuesHumongous()) { | |
671 r->rem_set()->scrub(_ctbs, _region_bm, _card_bm); | |
672 } | |
673 return false; | |
674 } | |
675 }; | |
676 | |
1861 | 677 void G1RemSet::scrub(BitMap* region_bm, BitMap* card_bm) { |
342 | 678 ScrubRSClosure scrub_cl(region_bm, card_bm); |
679 _g1->heap_region_iterate(&scrub_cl); | |
680 } | |
681 | |
1861 | 682 void G1RemSet::scrub_par(BitMap* region_bm, BitMap* card_bm, |
342 | 683 int worker_num, int claim_val) { |
684 ScrubRSClosure scrub_cl(region_bm, card_bm); | |
685 _g1->heap_region_par_iterate_chunked(&scrub_cl, worker_num, claim_val); | |
686 } | |
687 | |
688 | |
689 static IntHistogram out_of_histo(50, 50); | |
690 | |
1705 | 691 class TriggerClosure : public OopClosure { |
692 bool _trigger; | |
693 public: | |
694 TriggerClosure() : _trigger(false) { } | |
695 bool value() const { return _trigger; } | |
696 template <class T> void do_oop_nv(T* p) { _trigger = true; } | |
697 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
698 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
699 }; | |
700 | |
701 class InvokeIfNotTriggeredClosure: public OopClosure { | |
702 TriggerClosure* _t; | |
703 OopClosure* _oc; | |
704 public: | |
705 InvokeIfNotTriggeredClosure(TriggerClosure* t, OopClosure* oc): | |
706 _t(t), _oc(oc) { } | |
707 template <class T> void do_oop_nv(T* p) { | |
708 if (!_t->value()) _oc->do_oop(p); | |
709 } | |
710 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
711 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
712 }; | |
713 | |
714 class Mux2Closure : public OopClosure { | |
715 OopClosure* _c1; | |
716 OopClosure* _c2; | |
717 public: | |
718 Mux2Closure(OopClosure *c1, OopClosure *c2) : _c1(c1), _c2(c2) { } | |
719 template <class T> void do_oop_nv(T* p) { | |
720 _c1->do_oop(p); _c2->do_oop(p); | |
721 } | |
722 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
723 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
724 }; | |
725 | |
1861 | 726 bool G1RemSet::concurrentRefineOneCard_impl(jbyte* card_ptr, int worker_i, |
1705 | 727 bool check_for_refs_into_cset) { |
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728 // Construct the region representing the card. |
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729 HeapWord* start = _ct_bs->addr_for(card_ptr); |
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730 // And find the region containing it. |
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731 HeapRegion* r = _g1->heap_region_containing(start); |
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732 assert(r != NULL, "unexpected null"); |
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733 |
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734 HeapWord* end = _ct_bs->addr_for(card_ptr + 1); |
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735 MemRegion dirtyRegion(start, end); |
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736 |
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737 #if CARD_REPEAT_HISTO |
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738 init_ct_freq_table(_g1->max_capacity()); |
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739 ct_freq_note_card(_ct_bs->index_for(start)); |
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740 #endif |
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741 |
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742 assert(!check_for_refs_into_cset || _cset_rs_update_cl[worker_i] != NULL, "sanity"); |
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743 UpdateRSOrPushRefOopClosure update_rs_oop_cl(_g1, |
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744 _g1->g1_rem_set(), |
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745 _cset_rs_update_cl[worker_i], |
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746 check_for_refs_into_cset, |
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747 worker_i); |
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748 update_rs_oop_cl.set_from(r); |
1705 | 749 |
750 TriggerClosure trigger_cl; | |
751 FilterIntoCSClosure into_cs_cl(NULL, _g1, &trigger_cl); | |
752 InvokeIfNotTriggeredClosure invoke_cl(&trigger_cl, &into_cs_cl); | |
753 Mux2Closure mux(&invoke_cl, &update_rs_oop_cl); | |
754 | |
755 FilterOutOfRegionClosure filter_then_update_rs_oop_cl(r, | |
756 (check_for_refs_into_cset ? | |
757 (OopClosure*)&mux : | |
758 (OopClosure*)&update_rs_oop_cl)); | |
890
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759 |
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760 // Undirty the card. |
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761 *card_ptr = CardTableModRefBS::clean_card_val(); |
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762 // We must complete this write before we do any of the reads below. |
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763 OrderAccess::storeload(); |
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764 // And process it, being careful of unallocated portions of TLAB's. |
1666
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765 |
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766 // The region for the current card may be a young region. The |
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767 // current card may have been a card that was evicted from the |
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768 // card cache. When the card was inserted into the cache, we had |
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769 // determined that its region was non-young. While in the cache, |
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770 // the region may have been freed during a cleanup pause, reallocated |
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771 // and tagged as young. |
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772 // |
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773 // We wish to filter out cards for such a region but the current |
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774 // thread, if we're running conucrrently, may "see" the young type |
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775 // change at any time (so an earlier "is_young" check may pass or |
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776 // fail arbitrarily). We tell the iteration code to perform this |
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777 // filtering when it has been determined that there has been an actual |
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778 // allocation in this region and making it safe to check the young type. |
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779 bool filter_young = true; |
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780 |
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781 HeapWord* stop_point = |
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782 r->oops_on_card_seq_iterate_careful(dirtyRegion, |
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783 &filter_then_update_rs_oop_cl, |
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784 filter_young); |
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785 |
890
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786 // If stop_point is non-null, then we encountered an unallocated region |
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787 // (perhaps the unfilled portion of a TLAB.) For now, we'll dirty the |
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788 // card and re-enqueue: if we put off the card until a GC pause, then the |
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789 // unallocated portion will be filled in. Alternatively, we might try |
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790 // the full complexity of the technique used in "regular" precleaning. |
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791 if (stop_point != NULL) { |
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792 // The card might have gotten re-dirtied and re-enqueued while we |
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793 // worked. (In fact, it's pretty likely.) |
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794 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
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795 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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796 MutexLockerEx x(Shared_DirtyCardQ_lock, |
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797 Mutex::_no_safepoint_check_flag); |
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798 DirtyCardQueue* sdcq = |
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799 JavaThread::dirty_card_queue_set().shared_dirty_card_queue(); |
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800 sdcq->enqueue(card_ptr); |
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801 } |
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802 } else { |
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803 out_of_histo.add_entry(filter_then_update_rs_oop_cl.out_of_region()); |
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804 _conc_refine_cards++; |
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805 } |
1705 | 806 |
807 return trigger_cl.value(); | |
890
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808 } |
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809 |
1861 | 810 bool G1RemSet::concurrentRefineOneCard(jbyte* card_ptr, int worker_i, |
1705 | 811 bool check_for_refs_into_cset) { |
342 | 812 // If the card is no longer dirty, nothing to do. |
1705 | 813 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
814 // No need to return that this card contains refs that point | |
815 // into the collection set. | |
816 return false; | |
817 } | |
342 | 818 |
819 // Construct the region representing the card. | |
820 HeapWord* start = _ct_bs->addr_for(card_ptr); | |
821 // And find the region containing it. | |
822 HeapRegion* r = _g1->heap_region_containing(start); | |
823 if (r == NULL) { | |
824 guarantee(_g1->is_in_permanent(start), "Or else where?"); | |
1705 | 825 // Again no need to return that this card contains refs that |
826 // point into the collection set. | |
827 return false; // Not in the G1 heap (might be in perm, for example.) | |
342 | 828 } |
829 // Why do we have to check here whether a card is on a young region, | |
830 // given that we dirty young regions and, as a result, the | |
831 // post-barrier is supposed to filter them out and never to enqueue | |
832 // them? When we allocate a new region as the "allocation region" we | |
833 // actually dirty its cards after we release the lock, since card | |
834 // dirtying while holding the lock was a performance bottleneck. So, | |
835 // as a result, it is possible for other threads to actually | |
836 // allocate objects in the region (after the acquire the lock) | |
837 // before all the cards on the region are dirtied. This is unlikely, | |
838 // and it doesn't happen often, but it can happen. So, the extra | |
839 // check below filters out those cards. | |
637
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840 if (r->is_young()) { |
1705 | 841 return false; |
342 | 842 } |
843 // While we are processing RSet buffers during the collection, we | |
844 // actually don't want to scan any cards on the collection set, | |
845 // since we don't want to update remebered sets with entries that | |
846 // point into the collection set, given that live objects from the | |
847 // collection set are about to move and such entries will be stale | |
848 // very soon. This change also deals with a reliability issue which | |
849 // involves scanning a card in the collection set and coming across | |
850 // an array that was being chunked and looking malformed. Note, | |
851 // however, that if evacuation fails, we have to scan any objects | |
852 // that were not moved and create any missing entries. | |
853 if (r->in_collection_set()) { | |
1705 | 854 return false; |
342 | 855 } |
856 | |
890
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857 // Should we defer processing the card? |
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858 // |
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859 // Previously the result from the insert_cache call would be |
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860 // either card_ptr (implying that card_ptr was currently "cold"), |
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861 // null (meaning we had inserted the card ptr into the "hot" |
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862 // cache, which had some headroom), or a "hot" card ptr |
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863 // extracted from the "hot" cache. |
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864 // |
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865 // Now that the _card_counts cache in the ConcurrentG1Refine |
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866 // instance is an evicting hash table, the result we get back |
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867 // could be from evicting the card ptr in an already occupied |
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868 // bucket (in which case we have replaced the card ptr in the |
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869 // bucket with card_ptr and "defer" is set to false). To avoid |
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870 // having a data structure (updates to which would need a lock) |
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871 // to hold these unprocessed dirty cards, we need to immediately |
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872 // process card_ptr. The actions needed to be taken on return |
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873 // from cache_insert are summarized in the following table: |
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874 // |
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875 // res defer action |
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876 // -------------------------------------------------------------- |
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877 // null false card evicted from _card_counts & replaced with |
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878 // card_ptr; evicted ptr added to hot cache. |
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879 // No need to process res; immediately process card_ptr |
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880 // |
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881 // null true card not evicted from _card_counts; card_ptr added |
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882 // to hot cache. |
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883 // Nothing to do. |
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884 // |
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885 // non-null false card evicted from _card_counts & replaced with |
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886 // card_ptr; evicted ptr is currently "cold" or |
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887 // caused an eviction from the hot cache. |
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888 // Immediately process res; process card_ptr. |
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889 // |
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890 // non-null true card not evicted from _card_counts; card_ptr is |
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891 // currently cold, or caused an eviction from hot |
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892 // cache. |
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893 // Immediately process res; no need to process card_ptr. |
342 | 894 |
1705 | 895 |
890
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896 jbyte* res = card_ptr; |
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897 bool defer = false; |
1705 | 898 |
899 // This gets set to true if the card being refined has references | |
900 // that point into the collection set. | |
901 bool oops_into_cset = false; | |
902 | |
890
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903 if (_cg1r->use_cache()) { |
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904 jbyte* res = _cg1r->cache_insert(card_ptr, &defer); |
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905 if (res != NULL && (res != card_ptr || defer)) { |
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906 start = _ct_bs->addr_for(res); |
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907 r = _g1->heap_region_containing(start); |
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908 if (r == NULL) { |
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909 assert(_g1->is_in_permanent(start), "Or else where?"); |
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910 } else { |
1666
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911 // Checking whether the region we got back from the cache |
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912 // is young here is inappropriate. The region could have been |
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913 // freed, reallocated and tagged as young while in the cache. |
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914 // Hence we could see its young type change at any time. |
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915 // |
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916 // Process card pointer we get back from the hot card cache. This |
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917 // will check whether the region containing the card is young |
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918 // _after_ checking that the region has been allocated from. |
1705 | 919 oops_into_cset = concurrentRefineOneCard_impl(res, worker_i, |
920 false /* check_for_refs_into_cset */); | |
921 // The above call to concurrentRefineOneCard_impl is only | |
922 // performed if the hot card cache is enabled. This cache is | |
923 // disabled during an evacuation pause - which is the only | |
924 // time when we need know if the card contains references | |
925 // that point into the collection set. Also when the hot card | |
926 // cache is enabled, this code is executed by the concurrent | |
927 // refine threads - rather than the GC worker threads - and | |
928 // concurrentRefineOneCard_impl will return false. | |
929 assert(!oops_into_cset, "should not see true here"); | |
890
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930 } |
342 | 931 } |
932 } | |
933 | |
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934 if (!defer) { |
1705 | 935 oops_into_cset = |
936 concurrentRefineOneCard_impl(card_ptr, worker_i, check_for_refs_into_cset); | |
937 // We should only be detecting that the card contains references | |
938 // that point into the collection set if the current thread is | |
939 // a GC worker thread. | |
940 assert(!oops_into_cset || SafepointSynchronize::is_at_safepoint(), | |
941 "invalid result at non safepoint"); | |
342 | 942 } |
1705 | 943 return oops_into_cset; |
342 | 944 } |
945 | |
946 class HRRSStatsIter: public HeapRegionClosure { | |
947 size_t _occupied; | |
948 size_t _total_mem_sz; | |
949 size_t _max_mem_sz; | |
950 HeapRegion* _max_mem_sz_region; | |
951 public: | |
952 HRRSStatsIter() : | |
953 _occupied(0), | |
954 _total_mem_sz(0), | |
955 _max_mem_sz(0), | |
956 _max_mem_sz_region(NULL) | |
957 {} | |
958 | |
959 bool doHeapRegion(HeapRegion* r) { | |
960 if (r->continuesHumongous()) return false; | |
961 size_t mem_sz = r->rem_set()->mem_size(); | |
962 if (mem_sz > _max_mem_sz) { | |
963 _max_mem_sz = mem_sz; | |
964 _max_mem_sz_region = r; | |
965 } | |
966 _total_mem_sz += mem_sz; | |
967 size_t occ = r->rem_set()->occupied(); | |
968 _occupied += occ; | |
969 return false; | |
970 } | |
971 size_t total_mem_sz() { return _total_mem_sz; } | |
972 size_t max_mem_sz() { return _max_mem_sz; } | |
973 size_t occupied() { return _occupied; } | |
974 HeapRegion* max_mem_sz_region() { return _max_mem_sz_region; } | |
975 }; | |
976 | |
794 | 977 class PrintRSThreadVTimeClosure : public ThreadClosure { |
978 public: | |
979 virtual void do_thread(Thread *t) { | |
980 ConcurrentG1RefineThread* crt = (ConcurrentG1RefineThread*) t; | |
981 gclog_or_tty->print(" %5.2f", crt->vtime_accum()); | |
982 } | |
983 }; | |
984 | |
1861 | 985 void G1RemSet::print_summary_info() { |
342 | 986 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
987 | |
988 #if CARD_REPEAT_HISTO | |
989 gclog_or_tty->print_cr("\nG1 card_repeat count histogram: "); | |
990 gclog_or_tty->print_cr(" # of repeats --> # of cards with that number."); | |
991 card_repeat_count.print_on(gclog_or_tty); | |
992 #endif | |
993 | |
994 if (FILTEROUTOFREGIONCLOSURE_DOHISTOGRAMCOUNT) { | |
995 gclog_or_tty->print_cr("\nG1 rem-set out-of-region histogram: "); | |
996 gclog_or_tty->print_cr(" # of CS ptrs --> # of cards with that number."); | |
997 out_of_histo.print_on(gclog_or_tty); | |
998 } | |
794 | 999 gclog_or_tty->print_cr("\n Concurrent RS processed %d cards", |
1000 _conc_refine_cards); | |
342 | 1001 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
1002 jint tot_processed_buffers = | |
1003 dcqs.processed_buffers_mut() + dcqs.processed_buffers_rs_thread(); | |
1004 gclog_or_tty->print_cr(" Of %d completed buffers:", tot_processed_buffers); | |
794 | 1005 gclog_or_tty->print_cr(" %8d (%5.1f%%) by conc RS threads.", |
342 | 1006 dcqs.processed_buffers_rs_thread(), |
1007 100.0*(float)dcqs.processed_buffers_rs_thread()/ | |
1008 (float)tot_processed_buffers); | |
1009 gclog_or_tty->print_cr(" %8d (%5.1f%%) by mutator threads.", | |
1010 dcqs.processed_buffers_mut(), | |
1011 100.0*(float)dcqs.processed_buffers_mut()/ | |
1012 (float)tot_processed_buffers); | |
794 | 1013 gclog_or_tty->print_cr(" Conc RS threads times(s)"); |
1014 PrintRSThreadVTimeClosure p; | |
1015 gclog_or_tty->print(" "); | |
1016 g1->concurrent_g1_refine()->threads_do(&p); | |
342 | 1017 gclog_or_tty->print_cr(""); |
794 | 1018 |
1861 | 1019 HRRSStatsIter blk; |
1020 g1->heap_region_iterate(&blk); | |
1021 gclog_or_tty->print_cr(" Total heap region rem set sizes = " SIZE_FORMAT "K." | |
1022 " Max = " SIZE_FORMAT "K.", | |
1023 blk.total_mem_sz()/K, blk.max_mem_sz()/K); | |
1024 gclog_or_tty->print_cr(" Static structures = " SIZE_FORMAT "K," | |
1025 " free_lists = " SIZE_FORMAT "K.", | |
1026 HeapRegionRemSet::static_mem_size()/K, | |
1027 HeapRegionRemSet::fl_mem_size()/K); | |
1028 gclog_or_tty->print_cr(" %d occupied cards represented.", | |
1029 blk.occupied()); | |
1030 gclog_or_tty->print_cr(" Max sz region = [" PTR_FORMAT ", " PTR_FORMAT " )" | |
1031 ", cap = " SIZE_FORMAT "K, occ = " SIZE_FORMAT "K.", | |
1032 blk.max_mem_sz_region()->bottom(), blk.max_mem_sz_region()->end(), | |
1033 (blk.max_mem_sz_region()->rem_set()->mem_size() + K - 1)/K, | |
1034 (blk.max_mem_sz_region()->rem_set()->occupied() + K - 1)/K); | |
1035 gclog_or_tty->print_cr(" Did %d coarsenings.", HeapRegionRemSet::n_coarsenings()); | |
342 | 1036 } |
1705 | 1037 |
1861 | 1038 void G1RemSet::prepare_for_verify() { |
637
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1039 if (G1HRRSFlushLogBuffersOnVerify && |
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1040 (VerifyBeforeGC || VerifyAfterGC) |
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1041 && !_g1->full_collection()) { |
342 | 1042 cleanupHRRS(); |
1043 _g1->set_refine_cte_cl_concurrency(false); | |
1044 if (SafepointSynchronize::is_at_safepoint()) { | |
1045 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1046 dcqs.concatenate_logs(); | |
1047 } | |
1048 bool cg1r_use_cache = _cg1r->use_cache(); | |
1049 _cg1r->set_use_cache(false); | |
1705 | 1050 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); |
1051 updateRS(&into_cset_dcq, 0); | |
1052 _g1->into_cset_dirty_card_queue_set().clear(); | |
342 | 1053 _cg1r->set_use_cache(cg1r_use_cache); |
637
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1054 |
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1055 assert(JavaThread::dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
342 | 1056 } |
1057 } |