Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1RemSet.cpp @ 2403:1927db75dd85
7024475: loop doesn't terminate when compiled
Reviewed-by: kvn
author | never |
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date | Sun, 27 Mar 2011 00:00:14 -0700 |
parents | 04d1138b4cce |
children | 063382f9b575 |
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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 VerifyRSCleanCardOopClosure: public OopClosure { | |
90 G1CollectedHeap* _g1; | |
91 public: | |
92 VerifyRSCleanCardOopClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
93 | |
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94 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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95 virtual void do_oop( oop* p) { do_oop_work(p); } |
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96 template <class T> void do_oop_work(T* p) { |
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97 oop obj = oopDesc::load_decode_heap_oop(p); |
342 | 98 HeapRegion* to = _g1->heap_region_containing(obj); |
99 guarantee(to == NULL || !to->in_collection_set(), | |
100 "Missed a rem set member."); | |
101 } | |
102 }; | |
103 | |
1861 | 104 G1RemSet::G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs) |
105 : _g1(g1), _conc_refine_cards(0), | |
106 _ct_bs(ct_bs), _g1p(_g1->g1_policy()), | |
342 | 107 _cg1r(g1->concurrent_g1_refine()), |
1705 | 108 _cset_rs_update_cl(NULL), |
342 | 109 _cards_scanned(NULL), _total_cards_scanned(0) |
110 { | |
111 _seq_task = new SubTasksDone(NumSeqTasks); | |
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112 guarantee(n_workers() > 0, "There should be some workers"); |
1705 | 113 _cset_rs_update_cl = NEW_C_HEAP_ARRAY(OopsInHeapRegionClosure*, n_workers()); |
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114 for (uint i = 0; i < n_workers(); i++) { |
1705 | 115 _cset_rs_update_cl[i] = NULL; |
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116 } |
342 | 117 } |
118 | |
1861 | 119 G1RemSet::~G1RemSet() { |
342 | 120 delete _seq_task; |
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121 for (uint i = 0; i < n_workers(); i++) { |
1705 | 122 assert(_cset_rs_update_cl[i] == NULL, "it should be"); |
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123 } |
1705 | 124 FREE_C_HEAP_ARRAY(OopsInHeapRegionClosure*, _cset_rs_update_cl); |
342 | 125 } |
126 | |
127 void CountNonCleanMemRegionClosure::do_MemRegion(MemRegion mr) { | |
128 if (_g1->is_in_g1_reserved(mr.start())) { | |
129 _n += (int) ((mr.byte_size() / CardTableModRefBS::card_size)); | |
130 if (_start_first == NULL) _start_first = mr.start(); | |
131 } | |
132 } | |
133 | |
134 class ScanRSClosure : public HeapRegionClosure { | |
135 size_t _cards_done, _cards; | |
136 G1CollectedHeap* _g1h; | |
137 OopsInHeapRegionClosure* _oc; | |
138 G1BlockOffsetSharedArray* _bot_shared; | |
139 CardTableModRefBS *_ct_bs; | |
140 int _worker_i; | |
1261 | 141 int _block_size; |
342 | 142 bool _try_claimed; |
143 public: | |
144 ScanRSClosure(OopsInHeapRegionClosure* oc, int worker_i) : | |
145 _oc(oc), | |
146 _cards(0), | |
147 _cards_done(0), | |
148 _worker_i(worker_i), | |
149 _try_claimed(false) | |
150 { | |
151 _g1h = G1CollectedHeap::heap(); | |
152 _bot_shared = _g1h->bot_shared(); | |
153 _ct_bs = (CardTableModRefBS*) (_g1h->barrier_set()); | |
1261 | 154 _block_size = MAX2<int>(G1RSetScanBlockSize, 1); |
342 | 155 } |
156 | |
157 void set_try_claimed() { _try_claimed = true; } | |
158 | |
159 void scanCard(size_t index, HeapRegion *r) { | |
160 _cards_done++; | |
161 DirtyCardToOopClosure* cl = | |
162 r->new_dcto_closure(_oc, | |
163 CardTableModRefBS::Precise, | |
164 HeapRegionDCTOC::IntoCSFilterKind); | |
165 | |
166 // Set the "from" region in the closure. | |
167 _oc->set_region(r); | |
168 HeapWord* card_start = _bot_shared->address_for_index(index); | |
169 HeapWord* card_end = card_start + G1BlockOffsetSharedArray::N_words; | |
170 Space *sp = SharedHeap::heap()->space_containing(card_start); | |
171 MemRegion sm_region; | |
172 if (ParallelGCThreads > 0) { | |
173 // first find the used area | |
174 sm_region = sp->used_region_at_save_marks(); | |
175 } else { | |
176 // The closure is not idempotent. We shouldn't look at objects | |
177 // allocated during the GC. | |
178 sm_region = sp->used_region_at_save_marks(); | |
179 } | |
180 MemRegion mr = sm_region.intersection(MemRegion(card_start,card_end)); | |
181 if (!mr.is_empty()) { | |
182 cl->do_MemRegion(mr); | |
183 } | |
184 } | |
185 | |
186 void printCard(HeapRegion* card_region, size_t card_index, | |
187 HeapWord* card_start) { | |
188 gclog_or_tty->print_cr("T %d Region [" PTR_FORMAT ", " PTR_FORMAT ") " | |
189 "RS names card %p: " | |
190 "[" PTR_FORMAT ", " PTR_FORMAT ")", | |
191 _worker_i, | |
192 card_region->bottom(), card_region->end(), | |
193 card_index, | |
194 card_start, card_start + G1BlockOffsetSharedArray::N_words); | |
195 } | |
196 | |
197 bool doHeapRegion(HeapRegion* r) { | |
198 assert(r->in_collection_set(), "should only be called on elements of CS."); | |
199 HeapRegionRemSet* hrrs = r->rem_set(); | |
200 if (hrrs->iter_is_complete()) return false; // All done. | |
201 if (!_try_claimed && !hrrs->claim_iter()) return false; | |
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202 _g1h->push_dirty_cards_region(r); |
342 | 203 // If we didn't return above, then |
204 // _try_claimed || r->claim_iter() | |
205 // is true: either we're supposed to work on claimed-but-not-complete | |
206 // regions, or we successfully claimed the region. | |
207 HeapRegionRemSetIterator* iter = _g1h->rem_set_iterator(_worker_i); | |
208 hrrs->init_iterator(iter); | |
209 size_t card_index; | |
1261 | 210 |
211 // We claim cards in block so as to recude the contention. The block size is determined by | |
212 // the G1RSetScanBlockSize parameter. | |
213 size_t jump_to_card = hrrs->iter_claimed_next(_block_size); | |
214 for (size_t current_card = 0; iter->has_next(card_index); current_card++) { | |
215 if (current_card >= jump_to_card + _block_size) { | |
216 jump_to_card = hrrs->iter_claimed_next(_block_size); | |
747 | 217 } |
1261 | 218 if (current_card < jump_to_card) continue; |
342 | 219 HeapWord* card_start = _g1h->bot_shared()->address_for_index(card_index); |
220 #if 0 | |
221 gclog_or_tty->print("Rem set iteration yielded card [" PTR_FORMAT ", " PTR_FORMAT ").\n", | |
222 card_start, card_start + CardTableModRefBS::card_size_in_words); | |
223 #endif | |
224 | |
225 HeapRegion* card_region = _g1h->heap_region_containing(card_start); | |
226 assert(card_region != NULL, "Yielding cards not in the heap?"); | |
227 _cards++; | |
228 | |
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229 if (!card_region->is_on_dirty_cards_region_list()) { |
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230 _g1h->push_dirty_cards_region(card_region); |
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231 } |
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232 |
747 | 233 // If the card is dirty, then we will scan it during updateRS. |
234 if (!card_region->in_collection_set() && !_ct_bs->is_card_dirty(card_index)) { | |
1261 | 235 // We make the card as "claimed" lazily (so races are possible but they're benign), |
236 // which reduces the number of duplicate scans (the rsets of the regions in the cset | |
237 // can intersect). | |
238 if (!_ct_bs->is_card_claimed(card_index)) { | |
239 _ct_bs->set_card_claimed(card_index); | |
240 scanCard(card_index, card_region); | |
241 } | |
342 | 242 } |
243 } | |
747 | 244 if (!_try_claimed) { |
245 hrrs->set_iter_complete(); | |
246 } | |
342 | 247 return false; |
248 } | |
249 // Set all cards back to clean. | |
250 void cleanup() {_g1h->cleanUpCardTable();} | |
251 size_t cards_done() { return _cards_done;} | |
252 size_t cards_looked_up() { return _cards;} | |
253 }; | |
254 | |
255 // We want the parallel threads to start their scanning at | |
256 // different collection set regions to avoid contention. | |
257 // If we have: | |
258 // n collection set regions | |
259 // p threads | |
260 // Then thread t will start at region t * floor (n/p) | |
261 | |
1861 | 262 HeapRegion* G1RemSet::calculateStartRegion(int worker_i) { |
342 | 263 HeapRegion* result = _g1p->collection_set(); |
264 if (ParallelGCThreads > 0) { | |
265 size_t cs_size = _g1p->collection_set_size(); | |
266 int n_workers = _g1->workers()->total_workers(); | |
267 size_t cs_spans = cs_size / n_workers; | |
268 size_t ind = cs_spans * worker_i; | |
269 for (size_t i = 0; i < ind; i++) | |
270 result = result->next_in_collection_set(); | |
271 } | |
272 return result; | |
273 } | |
274 | |
1861 | 275 void G1RemSet::scanRS(OopsInHeapRegionClosure* oc, int worker_i) { |
342 | 276 double rs_time_start = os::elapsedTime(); |
277 HeapRegion *startRegion = calculateStartRegion(worker_i); | |
278 | |
1261 | 279 ScanRSClosure scanRScl(oc, worker_i); |
342 | 280 _g1->collection_set_iterate_from(startRegion, &scanRScl); |
281 scanRScl.set_try_claimed(); | |
282 _g1->collection_set_iterate_from(startRegion, &scanRScl); | |
283 | |
1261 | 284 double scan_rs_time_sec = os::elapsedTime() - rs_time_start; |
342 | 285 |
286 assert( _cards_scanned != NULL, "invariant" ); | |
287 _cards_scanned[worker_i] = scanRScl.cards_done(); | |
288 | |
289 _g1p->record_scan_rs_time(worker_i, scan_rs_time_sec * 1000.0); | |
290 } | |
291 | |
1705 | 292 // Closure used for updating RSets and recording references that |
293 // point into the collection set. Only called during an | |
294 // evacuation pause. | |
295 | |
296 class RefineRecordRefsIntoCSCardTableEntryClosure: public CardTableEntryClosure { | |
297 G1RemSet* _g1rs; | |
298 DirtyCardQueue* _into_cset_dcq; | |
299 public: | |
300 RefineRecordRefsIntoCSCardTableEntryClosure(G1CollectedHeap* g1h, | |
301 DirtyCardQueue* into_cset_dcq) : | |
302 _g1rs(g1h->g1_rem_set()), _into_cset_dcq(into_cset_dcq) | |
303 {} | |
304 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
305 // The only time we care about recording cards that | |
306 // contain references that point into the collection set | |
307 // is during RSet updating within an evacuation pause. | |
308 // In this case worker_i should be the id of a GC worker thread. | |
309 assert(SafepointSynchronize::is_at_safepoint(), "not during an evacuation pause"); | |
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310 assert(worker_i < (int) (ParallelGCThreads == 0 ? 1 : ParallelGCThreads), "should be a GC worker"); |
342 | 311 |
1705 | 312 if (_g1rs->concurrentRefineOneCard(card_ptr, worker_i, true)) { |
313 // 'card_ptr' contains references that point into the collection | |
314 // set. We need to record the card in the DCQS | |
315 // (G1CollectedHeap::into_cset_dirty_card_queue_set()) | |
316 // that's used for that purpose. | |
317 // | |
318 // Enqueue the card | |
319 _into_cset_dcq->enqueue(card_ptr); | |
320 } | |
321 return true; | |
322 } | |
323 }; | |
324 | |
1861 | 325 void G1RemSet::updateRS(DirtyCardQueue* into_cset_dcq, int worker_i) { |
342 | 326 double start = os::elapsedTime(); |
1705 | 327 // Apply the given closure to all remaining log entries. |
328 RefineRecordRefsIntoCSCardTableEntryClosure into_cset_update_rs_cl(_g1, into_cset_dcq); | |
329 _g1->iterate_dirty_card_closure(&into_cset_update_rs_cl, into_cset_dcq, false, worker_i); | |
330 | |
794 | 331 // Now there should be no dirty cards. |
332 if (G1RSLogCheckCardTable) { | |
333 CountNonCleanMemRegionClosure cl(_g1); | |
334 _ct_bs->mod_card_iterate(&cl); | |
335 // XXX This isn't true any more: keeping cards of young regions | |
336 // marked dirty broke it. Need some reasonable fix. | |
337 guarantee(cl.n() == 0, "Card table should be clean."); | |
342 | 338 } |
794 | 339 |
342 | 340 _g1p->record_update_rs_time(worker_i, (os::elapsedTime() - start) * 1000.0); |
341 } | |
342 | |
343 #ifndef PRODUCT | |
344 class PrintRSClosure : public HeapRegionClosure { | |
345 int _count; | |
346 public: | |
347 PrintRSClosure() : _count(0) {} | |
348 bool doHeapRegion(HeapRegion* r) { | |
349 HeapRegionRemSet* hrrs = r->rem_set(); | |
350 _count += (int) hrrs->occupied(); | |
351 if (hrrs->occupied() == 0) { | |
352 gclog_or_tty->print("Heap Region [" PTR_FORMAT ", " PTR_FORMAT ") " | |
353 "has no remset entries\n", | |
354 r->bottom(), r->end()); | |
355 } else { | |
356 gclog_or_tty->print("Printing rem set for heap region [" PTR_FORMAT ", " PTR_FORMAT ")\n", | |
357 r->bottom(), r->end()); | |
358 r->print(); | |
359 hrrs->print(); | |
360 gclog_or_tty->print("\nDone printing rem set\n"); | |
361 } | |
362 return false; | |
363 } | |
364 int occupied() {return _count;} | |
365 }; | |
366 #endif | |
367 | |
368 class CountRSSizeClosure: public HeapRegionClosure { | |
369 size_t _n; | |
370 size_t _tot; | |
371 size_t _max; | |
372 HeapRegion* _max_r; | |
373 enum { | |
374 N = 20, | |
375 MIN = 6 | |
376 }; | |
377 int _histo[N]; | |
378 public: | |
379 CountRSSizeClosure() : _n(0), _tot(0), _max(0), _max_r(NULL) { | |
380 for (int i = 0; i < N; i++) _histo[i] = 0; | |
381 } | |
382 bool doHeapRegion(HeapRegion* r) { | |
383 if (!r->continuesHumongous()) { | |
384 size_t occ = r->rem_set()->occupied(); | |
385 _n++; | |
386 _tot += occ; | |
387 if (occ > _max) { | |
388 _max = occ; | |
389 _max_r = r; | |
390 } | |
391 // Fit it into a histo bin. | |
392 int s = 1 << MIN; | |
393 int i = 0; | |
394 while (occ > (size_t) s && i < (N-1)) { | |
395 s = s << 1; | |
396 i++; | |
397 } | |
398 _histo[i]++; | |
399 } | |
400 return false; | |
401 } | |
402 size_t n() { return _n; } | |
403 size_t tot() { return _tot; } | |
404 size_t mx() { return _max; } | |
405 HeapRegion* mxr() { return _max_r; } | |
406 void print_histo() { | |
407 int mx = N; | |
408 while (mx >= 0) { | |
409 if (_histo[mx-1] > 0) break; | |
410 mx--; | |
411 } | |
412 gclog_or_tty->print_cr("Number of regions with given RS sizes:"); | |
413 gclog_or_tty->print_cr(" <= %8d %8d", 1 << MIN, _histo[0]); | |
414 for (int i = 1; i < mx-1; i++) { | |
415 gclog_or_tty->print_cr(" %8d - %8d %8d", | |
416 (1 << (MIN + i - 1)) + 1, | |
417 1 << (MIN + i), | |
418 _histo[i]); | |
419 } | |
420 gclog_or_tty->print_cr(" > %8d %8d", (1 << (MIN+mx-2))+1, _histo[mx-1]); | |
421 } | |
422 }; | |
423 | |
1861 | 424 void G1RemSet::cleanupHRRS() { |
342 | 425 HeapRegionRemSet::cleanup(); |
426 } | |
427 | |
1861 | 428 void G1RemSet::oops_into_collection_set_do(OopsInHeapRegionClosure* oc, |
342 | 429 int worker_i) { |
430 #if CARD_REPEAT_HISTO | |
431 ct_freq_update_histo_and_reset(); | |
432 #endif | |
433 if (worker_i == 0) { | |
434 _cg1r->clear_and_record_card_counts(); | |
435 } | |
436 | |
437 // Make this into a command-line flag... | |
438 if (G1RSCountHisto && (ParallelGCThreads == 0 || worker_i == 0)) { | |
439 CountRSSizeClosure count_cl; | |
440 _g1->heap_region_iterate(&count_cl); | |
441 gclog_or_tty->print_cr("Avg of %d RS counts is %f, max is %d, " | |
442 "max region is " PTR_FORMAT, | |
443 count_cl.n(), (float)count_cl.tot()/(float)count_cl.n(), | |
444 count_cl.mx(), count_cl.mxr()); | |
445 count_cl.print_histo(); | |
446 } | |
447 | |
1705 | 448 // We cache the value of 'oc' closure into the appropriate slot in the |
449 // _cset_rs_update_cl for this worker | |
450 assert(worker_i < (int)n_workers(), "sanity"); | |
451 _cset_rs_update_cl[worker_i] = oc; | |
452 | |
453 // A DirtyCardQueue that is used to hold cards containing references | |
454 // that point into the collection set. This DCQ is associated with a | |
455 // special DirtyCardQueueSet (see g1CollectedHeap.hpp). Under normal | |
456 // circumstances (i.e. the pause successfully completes), these cards | |
457 // are just discarded (there's no need to update the RSets of regions | |
458 // that were in the collection set - after the pause these regions | |
459 // are wholly 'free' of live objects. In the event of an evacuation | |
460 // failure the cards/buffers in this queue set are: | |
461 // * passed to the DirtyCardQueueSet that is used to manage deferred | |
462 // RSet updates, or | |
463 // * scanned for references that point into the collection set | |
464 // and the RSet of the corresponding region in the collection set | |
465 // is updated immediately. | |
466 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); | |
467 | |
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468 assert((ParallelGCThreads > 0) || worker_i == 0, "invariant"); |
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469 |
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470 // The two flags below were introduced temporarily to serialize |
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471 // the updating and scanning of remembered sets. There are some |
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472 // race conditions when these two operations are done in parallel |
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473 // and they are causing failures. When we resolve said race |
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474 // conditions, we'll revert back to parallel remembered set |
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475 // updating and scanning. See CRs 6677707 and 6677708. |
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476 if (G1UseParallelRSetUpdating || (worker_i == 0)) { |
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477 updateRS(&into_cset_dcq, worker_i); |
342 | 478 } else { |
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479 _g1p->record_update_rs_processed_buffers(worker_i, 0.0); |
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480 _g1p->record_update_rs_time(worker_i, 0.0); |
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481 } |
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482 if (G1UseParallelRSetScanning || (worker_i == 0)) { |
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483 scanRS(oc, worker_i); |
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484 } else { |
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485 _g1p->record_scan_rs_time(worker_i, 0.0); |
342 | 486 } |
1705 | 487 |
488 // We now clear the cached values of _cset_rs_update_cl for this worker | |
489 _cset_rs_update_cl[worker_i] = NULL; | |
342 | 490 } |
491 | |
1861 | 492 void G1RemSet::prepare_for_oops_into_collection_set_do() { |
342 | 493 #if G1_REM_SET_LOGGING |
494 PrintRSClosure cl; | |
495 _g1->collection_set_iterate(&cl); | |
496 #endif | |
497 cleanupHRRS(); | |
498 ConcurrentG1Refine* cg1r = _g1->concurrent_g1_refine(); | |
499 _g1->set_refine_cte_cl_concurrency(false); | |
500 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
501 dcqs.concatenate_logs(); | |
502 | |
503 if (ParallelGCThreads > 0) { | |
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504 _seq_task->set_n_threads((int)n_workers()); |
342 | 505 } |
506 guarantee( _cards_scanned == NULL, "invariant" ); | |
507 _cards_scanned = NEW_C_HEAP_ARRAY(size_t, n_workers()); | |
545 | 508 for (uint i = 0; i < n_workers(); ++i) { |
509 _cards_scanned[i] = 0; | |
510 } | |
342 | 511 _total_cards_scanned = 0; |
512 } | |
513 | |
514 | |
515 class cleanUpIteratorsClosure : public HeapRegionClosure { | |
516 bool doHeapRegion(HeapRegion *r) { | |
517 HeapRegionRemSet* hrrs = r->rem_set(); | |
518 hrrs->init_for_par_iteration(); | |
519 return false; | |
520 } | |
521 }; | |
522 | |
1705 | 523 // This closure, applied to a DirtyCardQueueSet, is used to immediately |
524 // update the RSets for the regions in the CSet. For each card it iterates | |
525 // through the oops which coincide with that card. It scans the reference | |
526 // fields in each oop; when it finds an oop that points into the collection | |
527 // set, the RSet for the region containing the referenced object is updated. | |
528 class UpdateRSetCardTableEntryIntoCSetClosure: public CardTableEntryClosure { | |
616
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529 G1CollectedHeap* _g1; |
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530 CardTableModRefBS* _ct_bs; |
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531 public: |
1705 | 532 UpdateRSetCardTableEntryIntoCSetClosure(G1CollectedHeap* g1, |
533 CardTableModRefBS* bs): | |
534 _g1(g1), _ct_bs(bs) | |
535 { } | |
536 | |
537 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
538 // Construct the region representing the card. | |
539 HeapWord* start = _ct_bs->addr_for(card_ptr); | |
540 // And find the region containing it. | |
541 HeapRegion* r = _g1->heap_region_containing(start); | |
542 assert(r != NULL, "unexpected null"); | |
543 | |
544 // Scan oops in the card looking for references into the collection set | |
545 HeapWord* end = _ct_bs->addr_for(card_ptr + 1); | |
546 MemRegion scanRegion(start, end); | |
547 | |
548 UpdateRSetImmediate update_rs_cl(_g1->g1_rem_set()); | |
549 FilterIntoCSClosure update_rs_cset_oop_cl(NULL, _g1, &update_rs_cl); | |
550 FilterOutOfRegionClosure filter_then_update_rs_cset_oop_cl(r, &update_rs_cset_oop_cl); | |
551 | |
552 // We can pass false as the "filter_young" parameter here as: | |
553 // * we should be in a STW pause, | |
554 // * the DCQS to which this closure is applied is used to hold | |
555 // references that point into the collection set from the prior | |
556 // RSet updating, | |
557 // * the post-write barrier shouldn't be logging updates to young | |
558 // regions (but there is a situation where this can happen - see | |
1861 | 559 // the comment in G1RemSet::concurrentRefineOneCard below - |
1705 | 560 // that should not be applicable here), and |
561 // * during actual RSet updating, the filtering of cards in young | |
562 // regions in HeapRegion::oops_on_card_seq_iterate_careful is | |
563 // employed. | |
564 // As a result, when this closure is applied to "refs into cset" | |
565 // DCQS, we shouldn't see any cards in young regions. | |
566 update_rs_cl.set_region(r); | |
567 HeapWord* stop_point = | |
568 r->oops_on_card_seq_iterate_careful(scanRegion, | |
569 &filter_then_update_rs_cset_oop_cl, | |
570 false /* filter_young */); | |
571 | |
572 // Since this is performed in the event of an evacuation failure, we | |
573 // we shouldn't see a non-null stop point | |
574 assert(stop_point == NULL, "saw an unallocated region"); | |
575 return true; | |
616
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576 } |
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577 }; |
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578 |
1861 | 579 void G1RemSet::cleanup_after_oops_into_collection_set_do() { |
342 | 580 guarantee( _cards_scanned != NULL, "invariant" ); |
581 _total_cards_scanned = 0; | |
582 for (uint i = 0; i < n_workers(); ++i) | |
583 _total_cards_scanned += _cards_scanned[i]; | |
584 FREE_C_HEAP_ARRAY(size_t, _cards_scanned); | |
585 _cards_scanned = NULL; | |
586 // Cleanup after copy | |
587 #if G1_REM_SET_LOGGING | |
588 PrintRSClosure cl; | |
589 _g1->heap_region_iterate(&cl); | |
590 #endif | |
591 _g1->set_refine_cte_cl_concurrency(true); | |
592 cleanUpIteratorsClosure iterClosure; | |
593 _g1->collection_set_iterate(&iterClosure); | |
594 // Set all cards back to clean. | |
595 _g1->cleanUpCardTable(); | |
794 | 596 |
1705 | 597 DirtyCardQueueSet& into_cset_dcqs = _g1->into_cset_dirty_card_queue_set(); |
598 int into_cset_n_buffers = into_cset_dcqs.completed_buffers_num(); | |
599 | |
616
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600 if (_g1->evacuation_failed()) { |
1705 | 601 // Restore remembered sets for the regions pointing into the collection set. |
602 | |
616
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603 if (G1DeferredRSUpdate) { |
1705 | 604 // If deferred RS updates are enabled then we just need to transfer |
605 // the completed buffers from (a) the DirtyCardQueueSet used to hold | |
606 // cards that contain references that point into the collection set | |
607 // to (b) the DCQS used to hold the deferred RS updates | |
608 _g1->dirty_card_queue_set().merge_bufferlists(&into_cset_dcqs); | |
616
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609 } else { |
1705 | 610 |
611 CardTableModRefBS* bs = (CardTableModRefBS*)_g1->barrier_set(); | |
612 UpdateRSetCardTableEntryIntoCSetClosure update_rs_cset_immediate(_g1, bs); | |
613 | |
614 int n_completed_buffers = 0; | |
615 while (into_cset_dcqs.apply_closure_to_completed_buffer(&update_rs_cset_immediate, | |
616 0, 0, true)) { | |
617 n_completed_buffers++; | |
618 } | |
619 assert(n_completed_buffers == into_cset_n_buffers, "missed some buffers"); | |
616
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620 } |
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621 } |
1705 | 622 |
623 // Free any completed buffers in the DirtyCardQueueSet used to hold cards | |
624 // which contain references that point into the collection. | |
625 _g1->into_cset_dirty_card_queue_set().clear(); | |
626 assert(_g1->into_cset_dirty_card_queue_set().completed_buffers_num() == 0, | |
627 "all buffers should be freed"); | |
628 _g1->into_cset_dirty_card_queue_set().clear_n_completed_buffers(); | |
342 | 629 } |
630 | |
631 class ScrubRSClosure: public HeapRegionClosure { | |
632 G1CollectedHeap* _g1h; | |
633 BitMap* _region_bm; | |
634 BitMap* _card_bm; | |
635 CardTableModRefBS* _ctbs; | |
636 public: | |
637 ScrubRSClosure(BitMap* region_bm, BitMap* card_bm) : | |
638 _g1h(G1CollectedHeap::heap()), | |
639 _region_bm(region_bm), _card_bm(card_bm), | |
640 _ctbs(NULL) | |
641 { | |
642 ModRefBarrierSet* bs = _g1h->mr_bs(); | |
643 guarantee(bs->is_a(BarrierSet::CardTableModRef), "Precondition"); | |
644 _ctbs = (CardTableModRefBS*)bs; | |
645 } | |
646 | |
647 bool doHeapRegion(HeapRegion* r) { | |
648 if (!r->continuesHumongous()) { | |
649 r->rem_set()->scrub(_ctbs, _region_bm, _card_bm); | |
650 } | |
651 return false; | |
652 } | |
653 }; | |
654 | |
1861 | 655 void G1RemSet::scrub(BitMap* region_bm, BitMap* card_bm) { |
342 | 656 ScrubRSClosure scrub_cl(region_bm, card_bm); |
657 _g1->heap_region_iterate(&scrub_cl); | |
658 } | |
659 | |
1861 | 660 void G1RemSet::scrub_par(BitMap* region_bm, BitMap* card_bm, |
342 | 661 int worker_num, int claim_val) { |
662 ScrubRSClosure scrub_cl(region_bm, card_bm); | |
663 _g1->heap_region_par_iterate_chunked(&scrub_cl, worker_num, claim_val); | |
664 } | |
665 | |
666 | |
667 static IntHistogram out_of_histo(50, 50); | |
668 | |
1705 | 669 class TriggerClosure : public OopClosure { |
670 bool _trigger; | |
671 public: | |
672 TriggerClosure() : _trigger(false) { } | |
673 bool value() const { return _trigger; } | |
674 template <class T> void do_oop_nv(T* p) { _trigger = true; } | |
675 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
676 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
677 }; | |
678 | |
679 class InvokeIfNotTriggeredClosure: public OopClosure { | |
680 TriggerClosure* _t; | |
681 OopClosure* _oc; | |
682 public: | |
683 InvokeIfNotTriggeredClosure(TriggerClosure* t, OopClosure* oc): | |
684 _t(t), _oc(oc) { } | |
685 template <class T> void do_oop_nv(T* p) { | |
686 if (!_t->value()) _oc->do_oop(p); | |
687 } | |
688 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
689 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
690 }; | |
691 | |
692 class Mux2Closure : public OopClosure { | |
693 OopClosure* _c1; | |
694 OopClosure* _c2; | |
695 public: | |
696 Mux2Closure(OopClosure *c1, OopClosure *c2) : _c1(c1), _c2(c2) { } | |
697 template <class T> void do_oop_nv(T* p) { | |
698 _c1->do_oop(p); _c2->do_oop(p); | |
699 } | |
700 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
701 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
702 }; | |
703 | |
1861 | 704 bool G1RemSet::concurrentRefineOneCard_impl(jbyte* card_ptr, int worker_i, |
1705 | 705 bool check_for_refs_into_cset) { |
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706 // Construct the region representing the card. |
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707 HeapWord* start = _ct_bs->addr_for(card_ptr); |
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708 // And find the region containing it. |
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709 HeapRegion* r = _g1->heap_region_containing(start); |
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710 assert(r != NULL, "unexpected null"); |
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711 |
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712 HeapWord* end = _ct_bs->addr_for(card_ptr + 1); |
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713 MemRegion dirtyRegion(start, end); |
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714 |
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715 #if CARD_REPEAT_HISTO |
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716 init_ct_freq_table(_g1->max_capacity()); |
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717 ct_freq_note_card(_ct_bs->index_for(start)); |
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718 #endif |
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719 |
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720 assert(!check_for_refs_into_cset || _cset_rs_update_cl[worker_i] != NULL, "sanity"); |
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721 UpdateRSOrPushRefOopClosure update_rs_oop_cl(_g1, |
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722 _g1->g1_rem_set(), |
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723 _cset_rs_update_cl[worker_i], |
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724 check_for_refs_into_cset, |
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725 worker_i); |
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726 update_rs_oop_cl.set_from(r); |
1705 | 727 |
728 TriggerClosure trigger_cl; | |
729 FilterIntoCSClosure into_cs_cl(NULL, _g1, &trigger_cl); | |
730 InvokeIfNotTriggeredClosure invoke_cl(&trigger_cl, &into_cs_cl); | |
731 Mux2Closure mux(&invoke_cl, &update_rs_oop_cl); | |
732 | |
733 FilterOutOfRegionClosure filter_then_update_rs_oop_cl(r, | |
734 (check_for_refs_into_cset ? | |
735 (OopClosure*)&mux : | |
736 (OopClosure*)&update_rs_oop_cl)); | |
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737 |
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738 // Undirty the card. |
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739 *card_ptr = CardTableModRefBS::clean_card_val(); |
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740 // We must complete this write before we do any of the reads below. |
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741 OrderAccess::storeload(); |
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742 // And process it, being careful of unallocated portions of TLAB's. |
1666
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743 |
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744 // The region for the current card may be a young region. The |
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745 // current card may have been a card that was evicted from the |
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746 // card cache. When the card was inserted into the cache, we had |
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747 // determined that its region was non-young. While in the cache, |
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748 // the region may have been freed during a cleanup pause, reallocated |
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749 // and tagged as young. |
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750 // |
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751 // We wish to filter out cards for such a region but the current |
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752 // thread, if we're running conucrrently, may "see" the young type |
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753 // change at any time (so an earlier "is_young" check may pass or |
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754 // fail arbitrarily). We tell the iteration code to perform this |
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755 // filtering when it has been determined that there has been an actual |
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756 // allocation in this region and making it safe to check the young type. |
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757 bool filter_young = true; |
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758 |
890
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759 HeapWord* stop_point = |
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760 r->oops_on_card_seq_iterate_careful(dirtyRegion, |
1666
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761 &filter_then_update_rs_oop_cl, |
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762 filter_young); |
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763 |
890
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764 // If stop_point is non-null, then we encountered an unallocated region |
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765 // (perhaps the unfilled portion of a TLAB.) For now, we'll dirty the |
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766 // card and re-enqueue: if we put off the card until a GC pause, then the |
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767 // unallocated portion will be filled in. Alternatively, we might try |
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768 // the full complexity of the technique used in "regular" precleaning. |
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769 if (stop_point != NULL) { |
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770 // The card might have gotten re-dirtied and re-enqueued while we |
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771 // worked. (In fact, it's pretty likely.) |
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772 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
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773 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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774 MutexLockerEx x(Shared_DirtyCardQ_lock, |
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775 Mutex::_no_safepoint_check_flag); |
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776 DirtyCardQueue* sdcq = |
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777 JavaThread::dirty_card_queue_set().shared_dirty_card_queue(); |
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778 sdcq->enqueue(card_ptr); |
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779 } |
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780 } else { |
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781 out_of_histo.add_entry(filter_then_update_rs_oop_cl.out_of_region()); |
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782 _conc_refine_cards++; |
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783 } |
1705 | 784 |
785 return trigger_cl.value(); | |
890
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786 } |
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787 |
1861 | 788 bool G1RemSet::concurrentRefineOneCard(jbyte* card_ptr, int worker_i, |
1705 | 789 bool check_for_refs_into_cset) { |
342 | 790 // If the card is no longer dirty, nothing to do. |
1705 | 791 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
792 // No need to return that this card contains refs that point | |
793 // into the collection set. | |
794 return false; | |
795 } | |
342 | 796 |
797 // Construct the region representing the card. | |
798 HeapWord* start = _ct_bs->addr_for(card_ptr); | |
799 // And find the region containing it. | |
800 HeapRegion* r = _g1->heap_region_containing(start); | |
801 if (r == NULL) { | |
802 guarantee(_g1->is_in_permanent(start), "Or else where?"); | |
1705 | 803 // Again no need to return that this card contains refs that |
804 // point into the collection set. | |
805 return false; // Not in the G1 heap (might be in perm, for example.) | |
342 | 806 } |
807 // Why do we have to check here whether a card is on a young region, | |
808 // given that we dirty young regions and, as a result, the | |
809 // post-barrier is supposed to filter them out and never to enqueue | |
810 // them? When we allocate a new region as the "allocation region" we | |
811 // actually dirty its cards after we release the lock, since card | |
812 // dirtying while holding the lock was a performance bottleneck. So, | |
813 // as a result, it is possible for other threads to actually | |
814 // allocate objects in the region (after the acquire the lock) | |
815 // before all the cards on the region are dirtied. This is unlikely, | |
816 // and it doesn't happen often, but it can happen. So, the extra | |
817 // check below filters out those cards. | |
637
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818 if (r->is_young()) { |
1705 | 819 return false; |
342 | 820 } |
821 // While we are processing RSet buffers during the collection, we | |
822 // actually don't want to scan any cards on the collection set, | |
823 // since we don't want to update remebered sets with entries that | |
824 // point into the collection set, given that live objects from the | |
825 // collection set are about to move and such entries will be stale | |
826 // very soon. This change also deals with a reliability issue which | |
827 // involves scanning a card in the collection set and coming across | |
828 // an array that was being chunked and looking malformed. Note, | |
829 // however, that if evacuation fails, we have to scan any objects | |
830 // that were not moved and create any missing entries. | |
831 if (r->in_collection_set()) { | |
1705 | 832 return false; |
342 | 833 } |
834 | |
890
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835 // Should we defer processing the card? |
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836 // |
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837 // Previously the result from the insert_cache call would be |
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838 // either card_ptr (implying that card_ptr was currently "cold"), |
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839 // null (meaning we had inserted the card ptr into the "hot" |
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840 // cache, which had some headroom), or a "hot" card ptr |
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841 // extracted from the "hot" cache. |
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842 // |
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843 // Now that the _card_counts cache in the ConcurrentG1Refine |
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844 // instance is an evicting hash table, the result we get back |
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845 // could be from evicting the card ptr in an already occupied |
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846 // bucket (in which case we have replaced the card ptr in the |
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847 // bucket with card_ptr and "defer" is set to false). To avoid |
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848 // having a data structure (updates to which would need a lock) |
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849 // to hold these unprocessed dirty cards, we need to immediately |
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850 // process card_ptr. The actions needed to be taken on return |
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851 // from cache_insert are summarized in the following table: |
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|
852 // |
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853 // res defer action |
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854 // -------------------------------------------------------------- |
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855 // null false card evicted from _card_counts & replaced with |
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856 // card_ptr; evicted ptr added to hot cache. |
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857 // No need to process res; immediately process card_ptr |
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858 // |
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859 // null true card not evicted from _card_counts; card_ptr added |
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860 // to hot cache. |
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861 // Nothing to do. |
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862 // |
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863 // non-null false card evicted from _card_counts & replaced with |
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864 // card_ptr; evicted ptr is currently "cold" or |
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865 // caused an eviction from the hot cache. |
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866 // Immediately process res; process card_ptr. |
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867 // |
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868 // non-null true card not evicted from _card_counts; card_ptr is |
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869 // currently cold, or caused an eviction from hot |
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|
870 // cache. |
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871 // Immediately process res; no need to process card_ptr. |
342 | 872 |
1705 | 873 |
890
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|
874 jbyte* res = card_ptr; |
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|
875 bool defer = false; |
1705 | 876 |
877 // This gets set to true if the card being refined has references | |
878 // that point into the collection set. | |
879 bool oops_into_cset = false; | |
880 | |
890
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881 if (_cg1r->use_cache()) { |
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882 jbyte* res = _cg1r->cache_insert(card_ptr, &defer); |
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883 if (res != NULL && (res != card_ptr || defer)) { |
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884 start = _ct_bs->addr_for(res); |
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885 r = _g1->heap_region_containing(start); |
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886 if (r == NULL) { |
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887 assert(_g1->is_in_permanent(start), "Or else where?"); |
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888 } else { |
1666
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889 // Checking whether the region we got back from the cache |
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890 // is young here is inappropriate. The region could have been |
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891 // freed, reallocated and tagged as young while in the cache. |
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892 // Hence we could see its young type change at any time. |
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893 // |
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894 // Process card pointer we get back from the hot card cache. This |
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895 // will check whether the region containing the card is young |
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896 // _after_ checking that the region has been allocated from. |
1705 | 897 oops_into_cset = concurrentRefineOneCard_impl(res, worker_i, |
898 false /* check_for_refs_into_cset */); | |
899 // The above call to concurrentRefineOneCard_impl is only | |
900 // performed if the hot card cache is enabled. This cache is | |
901 // disabled during an evacuation pause - which is the only | |
902 // time when we need know if the card contains references | |
903 // that point into the collection set. Also when the hot card | |
904 // cache is enabled, this code is executed by the concurrent | |
905 // refine threads - rather than the GC worker threads - and | |
906 // concurrentRefineOneCard_impl will return false. | |
907 assert(!oops_into_cset, "should not see true here"); | |
890
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908 } |
342 | 909 } |
910 } | |
911 | |
890
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912 if (!defer) { |
1705 | 913 oops_into_cset = |
914 concurrentRefineOneCard_impl(card_ptr, worker_i, check_for_refs_into_cset); | |
915 // We should only be detecting that the card contains references | |
916 // that point into the collection set if the current thread is | |
917 // a GC worker thread. | |
918 assert(!oops_into_cset || SafepointSynchronize::is_at_safepoint(), | |
919 "invalid result at non safepoint"); | |
342 | 920 } |
1705 | 921 return oops_into_cset; |
342 | 922 } |
923 | |
924 class HRRSStatsIter: public HeapRegionClosure { | |
925 size_t _occupied; | |
926 size_t _total_mem_sz; | |
927 size_t _max_mem_sz; | |
928 HeapRegion* _max_mem_sz_region; | |
929 public: | |
930 HRRSStatsIter() : | |
931 _occupied(0), | |
932 _total_mem_sz(0), | |
933 _max_mem_sz(0), | |
934 _max_mem_sz_region(NULL) | |
935 {} | |
936 | |
937 bool doHeapRegion(HeapRegion* r) { | |
938 if (r->continuesHumongous()) return false; | |
939 size_t mem_sz = r->rem_set()->mem_size(); | |
940 if (mem_sz > _max_mem_sz) { | |
941 _max_mem_sz = mem_sz; | |
942 _max_mem_sz_region = r; | |
943 } | |
944 _total_mem_sz += mem_sz; | |
945 size_t occ = r->rem_set()->occupied(); | |
946 _occupied += occ; | |
947 return false; | |
948 } | |
949 size_t total_mem_sz() { return _total_mem_sz; } | |
950 size_t max_mem_sz() { return _max_mem_sz; } | |
951 size_t occupied() { return _occupied; } | |
952 HeapRegion* max_mem_sz_region() { return _max_mem_sz_region; } | |
953 }; | |
954 | |
794 | 955 class PrintRSThreadVTimeClosure : public ThreadClosure { |
956 public: | |
957 virtual void do_thread(Thread *t) { | |
958 ConcurrentG1RefineThread* crt = (ConcurrentG1RefineThread*) t; | |
959 gclog_or_tty->print(" %5.2f", crt->vtime_accum()); | |
960 } | |
961 }; | |
962 | |
1861 | 963 void G1RemSet::print_summary_info() { |
342 | 964 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
965 | |
966 #if CARD_REPEAT_HISTO | |
967 gclog_or_tty->print_cr("\nG1 card_repeat count histogram: "); | |
968 gclog_or_tty->print_cr(" # of repeats --> # of cards with that number."); | |
969 card_repeat_count.print_on(gclog_or_tty); | |
970 #endif | |
971 | |
972 if (FILTEROUTOFREGIONCLOSURE_DOHISTOGRAMCOUNT) { | |
973 gclog_or_tty->print_cr("\nG1 rem-set out-of-region histogram: "); | |
974 gclog_or_tty->print_cr(" # of CS ptrs --> # of cards with that number."); | |
975 out_of_histo.print_on(gclog_or_tty); | |
976 } | |
794 | 977 gclog_or_tty->print_cr("\n Concurrent RS processed %d cards", |
978 _conc_refine_cards); | |
342 | 979 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
980 jint tot_processed_buffers = | |
981 dcqs.processed_buffers_mut() + dcqs.processed_buffers_rs_thread(); | |
982 gclog_or_tty->print_cr(" Of %d completed buffers:", tot_processed_buffers); | |
794 | 983 gclog_or_tty->print_cr(" %8d (%5.1f%%) by conc RS threads.", |
342 | 984 dcqs.processed_buffers_rs_thread(), |
985 100.0*(float)dcqs.processed_buffers_rs_thread()/ | |
986 (float)tot_processed_buffers); | |
987 gclog_or_tty->print_cr(" %8d (%5.1f%%) by mutator threads.", | |
988 dcqs.processed_buffers_mut(), | |
989 100.0*(float)dcqs.processed_buffers_mut()/ | |
990 (float)tot_processed_buffers); | |
794 | 991 gclog_or_tty->print_cr(" Conc RS threads times(s)"); |
992 PrintRSThreadVTimeClosure p; | |
993 gclog_or_tty->print(" "); | |
994 g1->concurrent_g1_refine()->threads_do(&p); | |
342 | 995 gclog_or_tty->print_cr(""); |
794 | 996 |
1861 | 997 HRRSStatsIter blk; |
998 g1->heap_region_iterate(&blk); | |
999 gclog_or_tty->print_cr(" Total heap region rem set sizes = " SIZE_FORMAT "K." | |
1000 " Max = " SIZE_FORMAT "K.", | |
1001 blk.total_mem_sz()/K, blk.max_mem_sz()/K); | |
1002 gclog_or_tty->print_cr(" Static structures = " SIZE_FORMAT "K," | |
1003 " free_lists = " SIZE_FORMAT "K.", | |
1004 HeapRegionRemSet::static_mem_size()/K, | |
1005 HeapRegionRemSet::fl_mem_size()/K); | |
1006 gclog_or_tty->print_cr(" %d occupied cards represented.", | |
1007 blk.occupied()); | |
1008 gclog_or_tty->print_cr(" Max sz region = [" PTR_FORMAT ", " PTR_FORMAT " )" | |
1009 ", cap = " SIZE_FORMAT "K, occ = " SIZE_FORMAT "K.", | |
1010 blk.max_mem_sz_region()->bottom(), blk.max_mem_sz_region()->end(), | |
1011 (blk.max_mem_sz_region()->rem_set()->mem_size() + K - 1)/K, | |
1012 (blk.max_mem_sz_region()->rem_set()->occupied() + K - 1)/K); | |
1013 gclog_or_tty->print_cr(" Did %d coarsenings.", HeapRegionRemSet::n_coarsenings()); | |
342 | 1014 } |
1705 | 1015 |
1861 | 1016 void G1RemSet::prepare_for_verify() { |
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1017 if (G1HRRSFlushLogBuffersOnVerify && |
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1018 (VerifyBeforeGC || VerifyAfterGC) |
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1019 && !_g1->full_collection()) { |
342 | 1020 cleanupHRRS(); |
1021 _g1->set_refine_cte_cl_concurrency(false); | |
1022 if (SafepointSynchronize::is_at_safepoint()) { | |
1023 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1024 dcqs.concatenate_logs(); | |
1025 } | |
1026 bool cg1r_use_cache = _cg1r->use_cache(); | |
1027 _cg1r->set_use_cache(false); | |
1705 | 1028 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); |
1029 updateRS(&into_cset_dcq, 0); | |
1030 _g1->into_cset_dirty_card_queue_set().clear(); | |
342 | 1031 _cg1r->set_use_cache(cg1r_use_cache); |
637
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1032 |
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1033 assert(JavaThread::dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
342 | 1034 } |
1035 } |