Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1RemSet.cpp @ 626:87fa6e083d82
6760309: G1: update remembered sets during Full GCs
Reviewed-by: iveresov, tonyp
author | apetrusenko |
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date | Tue, 10 Mar 2009 00:47:05 -0700 |
parents | 4f360ec815ba |
children | 7bb995fbd3c0 25e146966e7c |
rev | line source |
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342 | 1 /* |
2 * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_g1RemSet.cpp.incl" | |
27 | |
28 #define CARD_REPEAT_HISTO 0 | |
29 | |
30 #if CARD_REPEAT_HISTO | |
31 static size_t ct_freq_sz; | |
32 static jbyte* ct_freq = NULL; | |
33 | |
34 void init_ct_freq_table(size_t heap_sz_bytes) { | |
35 if (ct_freq == NULL) { | |
36 ct_freq_sz = heap_sz_bytes/CardTableModRefBS::card_size; | |
37 ct_freq = new jbyte[ct_freq_sz]; | |
38 for (size_t j = 0; j < ct_freq_sz; j++) ct_freq[j] = 0; | |
39 } | |
40 } | |
41 | |
42 void ct_freq_note_card(size_t index) { | |
43 assert(0 <= index && index < ct_freq_sz, "Bounds error."); | |
44 if (ct_freq[index] < 100) { ct_freq[index]++; } | |
45 } | |
46 | |
47 static IntHistogram card_repeat_count(10, 10); | |
48 | |
49 void ct_freq_update_histo_and_reset() { | |
50 for (size_t j = 0; j < ct_freq_sz; j++) { | |
51 card_repeat_count.add_entry(ct_freq[j]); | |
52 ct_freq[j] = 0; | |
53 } | |
54 | |
55 } | |
56 #endif | |
57 | |
58 | |
59 class IntoCSOopClosure: public OopsInHeapRegionClosure { | |
60 OopsInHeapRegionClosure* _blk; | |
61 G1CollectedHeap* _g1; | |
62 public: | |
63 IntoCSOopClosure(G1CollectedHeap* g1, OopsInHeapRegionClosure* blk) : | |
64 _g1(g1), _blk(blk) {} | |
65 void set_region(HeapRegion* from) { | |
66 _blk->set_region(from); | |
67 } | |
68 virtual void do_oop(narrowOop* p) { | |
69 guarantee(false, "NYI"); | |
70 } | |
71 virtual void do_oop(oop* p) { | |
72 oop obj = *p; | |
73 if (_g1->obj_in_cs(obj)) _blk->do_oop(p); | |
74 } | |
75 bool apply_to_weak_ref_discovered_field() { return true; } | |
76 bool idempotent() { return true; } | |
77 }; | |
78 | |
79 class IntoCSRegionClosure: public HeapRegionClosure { | |
80 IntoCSOopClosure _blk; | |
81 G1CollectedHeap* _g1; | |
82 public: | |
83 IntoCSRegionClosure(G1CollectedHeap* g1, OopsInHeapRegionClosure* blk) : | |
84 _g1(g1), _blk(g1, blk) {} | |
85 bool doHeapRegion(HeapRegion* r) { | |
86 if (!r->in_collection_set()) { | |
87 _blk.set_region(r); | |
88 if (r->isHumongous()) { | |
89 if (r->startsHumongous()) { | |
90 oop obj = oop(r->bottom()); | |
91 obj->oop_iterate(&_blk); | |
92 } | |
93 } else { | |
94 r->oop_before_save_marks_iterate(&_blk); | |
95 } | |
96 } | |
97 return false; | |
98 } | |
99 }; | |
100 | |
101 void | |
102 StupidG1RemSet::oops_into_collection_set_do(OopsInHeapRegionClosure* oc, | |
103 int worker_i) { | |
104 IntoCSRegionClosure rc(_g1, oc); | |
105 _g1->heap_region_iterate(&rc); | |
106 } | |
107 | |
108 class UpdateRSOutOfRegionClosure: public HeapRegionClosure { | |
109 G1CollectedHeap* _g1h; | |
110 ModRefBarrierSet* _mr_bs; | |
111 UpdateRSOopClosure _cl; | |
112 int _worker_i; | |
113 public: | |
114 UpdateRSOutOfRegionClosure(G1CollectedHeap* g1, int worker_i = 0) : | |
115 _cl(g1->g1_rem_set()->as_HRInto_G1RemSet(), worker_i), | |
116 _mr_bs(g1->mr_bs()), | |
117 _worker_i(worker_i), | |
118 _g1h(g1) | |
119 {} | |
120 bool doHeapRegion(HeapRegion* r) { | |
121 if (!r->in_collection_set() && !r->continuesHumongous()) { | |
122 _cl.set_from(r); | |
123 r->set_next_filter_kind(HeapRegionDCTOC::OutOfRegionFilterKind); | |
124 _mr_bs->mod_oop_in_space_iterate(r, &_cl, true, true); | |
125 } | |
126 return false; | |
127 } | |
128 }; | |
129 | |
130 class VerifyRSCleanCardOopClosure: public OopClosure { | |
131 G1CollectedHeap* _g1; | |
132 public: | |
133 VerifyRSCleanCardOopClosure(G1CollectedHeap* g1) : _g1(g1) {} | |
134 | |
135 virtual void do_oop(narrowOop* p) { | |
136 guarantee(false, "NYI"); | |
137 } | |
138 virtual void do_oop(oop* p) { | |
139 oop obj = *p; | |
140 HeapRegion* to = _g1->heap_region_containing(obj); | |
141 guarantee(to == NULL || !to->in_collection_set(), | |
142 "Missed a rem set member."); | |
143 } | |
144 }; | |
145 | |
146 HRInto_G1RemSet::HRInto_G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs) | |
147 : G1RemSet(g1), _ct_bs(ct_bs), _g1p(_g1->g1_policy()), | |
148 _cg1r(g1->concurrent_g1_refine()), | |
149 _par_traversal_in_progress(false), _new_refs(NULL), | |
150 _cards_scanned(NULL), _total_cards_scanned(0) | |
151 { | |
152 _seq_task = new SubTasksDone(NumSeqTasks); | |
616
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153 guarantee(n_workers() > 0, "There should be some workers"); |
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154 _new_refs = NEW_C_HEAP_ARRAY(GrowableArray<oop*>*, n_workers()); |
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155 for (uint i = 0; i < n_workers(); i++) { |
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156 _new_refs[i] = new (ResourceObj::C_HEAP) GrowableArray<oop*>(8192,true); |
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157 } |
342 | 158 } |
159 | |
160 HRInto_G1RemSet::~HRInto_G1RemSet() { | |
161 delete _seq_task; | |
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162 for (uint i = 0; i < n_workers(); i++) { |
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163 delete _new_refs[i]; |
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164 } |
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165 FREE_C_HEAP_ARRAY(GrowableArray<oop*>*, _new_refs); |
342 | 166 } |
167 | |
168 void CountNonCleanMemRegionClosure::do_MemRegion(MemRegion mr) { | |
169 if (_g1->is_in_g1_reserved(mr.start())) { | |
170 _n += (int) ((mr.byte_size() / CardTableModRefBS::card_size)); | |
171 if (_start_first == NULL) _start_first = mr.start(); | |
172 } | |
173 } | |
174 | |
175 class ScanRSClosure : public HeapRegionClosure { | |
176 size_t _cards_done, _cards; | |
177 G1CollectedHeap* _g1h; | |
178 OopsInHeapRegionClosure* _oc; | |
179 G1BlockOffsetSharedArray* _bot_shared; | |
180 CardTableModRefBS *_ct_bs; | |
181 int _worker_i; | |
182 bool _try_claimed; | |
183 public: | |
184 ScanRSClosure(OopsInHeapRegionClosure* oc, int worker_i) : | |
185 _oc(oc), | |
186 _cards(0), | |
187 _cards_done(0), | |
188 _worker_i(worker_i), | |
189 _try_claimed(false) | |
190 { | |
191 _g1h = G1CollectedHeap::heap(); | |
192 _bot_shared = _g1h->bot_shared(); | |
193 _ct_bs = (CardTableModRefBS*) (_g1h->barrier_set()); | |
194 } | |
195 | |
196 void set_try_claimed() { _try_claimed = true; } | |
197 | |
198 void scanCard(size_t index, HeapRegion *r) { | |
199 _cards_done++; | |
200 DirtyCardToOopClosure* cl = | |
201 r->new_dcto_closure(_oc, | |
202 CardTableModRefBS::Precise, | |
203 HeapRegionDCTOC::IntoCSFilterKind); | |
204 | |
205 // Set the "from" region in the closure. | |
206 _oc->set_region(r); | |
207 HeapWord* card_start = _bot_shared->address_for_index(index); | |
208 HeapWord* card_end = card_start + G1BlockOffsetSharedArray::N_words; | |
209 Space *sp = SharedHeap::heap()->space_containing(card_start); | |
210 MemRegion sm_region; | |
211 if (ParallelGCThreads > 0) { | |
212 // first find the used area | |
213 sm_region = sp->used_region_at_save_marks(); | |
214 } else { | |
215 // The closure is not idempotent. We shouldn't look at objects | |
216 // allocated during the GC. | |
217 sm_region = sp->used_region_at_save_marks(); | |
218 } | |
219 MemRegion mr = sm_region.intersection(MemRegion(card_start,card_end)); | |
220 if (!mr.is_empty()) { | |
221 cl->do_MemRegion(mr); | |
222 } | |
223 } | |
224 | |
225 void printCard(HeapRegion* card_region, size_t card_index, | |
226 HeapWord* card_start) { | |
227 gclog_or_tty->print_cr("T %d Region [" PTR_FORMAT ", " PTR_FORMAT ") " | |
228 "RS names card %p: " | |
229 "[" PTR_FORMAT ", " PTR_FORMAT ")", | |
230 _worker_i, | |
231 card_region->bottom(), card_region->end(), | |
232 card_index, | |
233 card_start, card_start + G1BlockOffsetSharedArray::N_words); | |
234 } | |
235 | |
236 bool doHeapRegion(HeapRegion* r) { | |
237 assert(r->in_collection_set(), "should only be called on elements of CS."); | |
238 HeapRegionRemSet* hrrs = r->rem_set(); | |
239 if (hrrs->iter_is_complete()) return false; // All done. | |
240 if (!_try_claimed && !hrrs->claim_iter()) return false; | |
241 // If we didn't return above, then | |
242 // _try_claimed || r->claim_iter() | |
243 // is true: either we're supposed to work on claimed-but-not-complete | |
244 // regions, or we successfully claimed the region. | |
245 HeapRegionRemSetIterator* iter = _g1h->rem_set_iterator(_worker_i); | |
246 hrrs->init_iterator(iter); | |
247 size_t card_index; | |
248 while (iter->has_next(card_index)) { | |
249 HeapWord* card_start = _g1h->bot_shared()->address_for_index(card_index); | |
250 | |
251 #if 0 | |
252 gclog_or_tty->print("Rem set iteration yielded card [" PTR_FORMAT ", " PTR_FORMAT ").\n", | |
253 card_start, card_start + CardTableModRefBS::card_size_in_words); | |
254 #endif | |
255 | |
256 HeapRegion* card_region = _g1h->heap_region_containing(card_start); | |
257 assert(card_region != NULL, "Yielding cards not in the heap?"); | |
258 _cards++; | |
259 | |
260 if (!card_region->in_collection_set()) { | |
261 // If the card is dirty, then we will scan it during updateRS. | |
262 if (!_ct_bs->is_card_claimed(card_index) && | |
263 !_ct_bs->is_card_dirty(card_index)) { | |
264 assert(_ct_bs->is_card_clean(card_index) || | |
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265 _ct_bs->is_card_claimed(card_index) || |
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266 _ct_bs->is_card_deferred(card_index), |
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267 "Card is either clean, claimed or deferred"); |
342 | 268 if (_ct_bs->claim_card(card_index)) |
269 scanCard(card_index, card_region); | |
270 } | |
271 } | |
272 } | |
273 hrrs->set_iter_complete(); | |
274 return false; | |
275 } | |
276 // Set all cards back to clean. | |
277 void cleanup() {_g1h->cleanUpCardTable();} | |
278 size_t cards_done() { return _cards_done;} | |
279 size_t cards_looked_up() { return _cards;} | |
280 }; | |
281 | |
282 // We want the parallel threads to start their scanning at | |
283 // different collection set regions to avoid contention. | |
284 // If we have: | |
285 // n collection set regions | |
286 // p threads | |
287 // Then thread t will start at region t * floor (n/p) | |
288 | |
289 HeapRegion* HRInto_G1RemSet::calculateStartRegion(int worker_i) { | |
290 HeapRegion* result = _g1p->collection_set(); | |
291 if (ParallelGCThreads > 0) { | |
292 size_t cs_size = _g1p->collection_set_size(); | |
293 int n_workers = _g1->workers()->total_workers(); | |
294 size_t cs_spans = cs_size / n_workers; | |
295 size_t ind = cs_spans * worker_i; | |
296 for (size_t i = 0; i < ind; i++) | |
297 result = result->next_in_collection_set(); | |
298 } | |
299 return result; | |
300 } | |
301 | |
302 void HRInto_G1RemSet::scanRS(OopsInHeapRegionClosure* oc, int worker_i) { | |
303 double rs_time_start = os::elapsedTime(); | |
304 HeapRegion *startRegion = calculateStartRegion(worker_i); | |
305 | |
306 BufferingOopsInHeapRegionClosure boc(oc); | |
307 ScanRSClosure scanRScl(&boc, worker_i); | |
308 _g1->collection_set_iterate_from(startRegion, &scanRScl); | |
309 scanRScl.set_try_claimed(); | |
310 _g1->collection_set_iterate_from(startRegion, &scanRScl); | |
311 | |
312 boc.done(); | |
313 double closure_app_time_sec = boc.closure_app_seconds(); | |
314 double scan_rs_time_sec = (os::elapsedTime() - rs_time_start) - | |
315 closure_app_time_sec; | |
316 double closure_app_time_ms = closure_app_time_sec * 1000.0; | |
317 | |
318 assert( _cards_scanned != NULL, "invariant" ); | |
319 _cards_scanned[worker_i] = scanRScl.cards_done(); | |
320 | |
321 _g1p->record_scan_rs_start_time(worker_i, rs_time_start * 1000.0); | |
322 _g1p->record_scan_rs_time(worker_i, scan_rs_time_sec * 1000.0); | |
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323 |
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324 double scan_new_refs_time_ms = _g1p->get_scan_new_refs_time(worker_i); |
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325 if (scan_new_refs_time_ms > 0.0) { |
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326 closure_app_time_ms += scan_new_refs_time_ms; |
342 | 327 } |
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328 |
342 | 329 _g1p->record_obj_copy_time(worker_i, closure_app_time_ms); |
330 } | |
331 | |
332 void HRInto_G1RemSet::updateRS(int worker_i) { | |
333 ConcurrentG1Refine* cg1r = _g1->concurrent_g1_refine(); | |
334 | |
335 double start = os::elapsedTime(); | |
336 _g1p->record_update_rs_start_time(worker_i, start * 1000.0); | |
337 | |
338 if (G1RSBarrierUseQueue && !cg1r->do_traversal()) { | |
339 // Apply the appropriate closure to all remaining log entries. | |
340 _g1->iterate_dirty_card_closure(false, worker_i); | |
341 // Now there should be no dirty cards. | |
342 if (G1RSLogCheckCardTable) { | |
343 CountNonCleanMemRegionClosure cl(_g1); | |
344 _ct_bs->mod_card_iterate(&cl); | |
345 // XXX This isn't true any more: keeping cards of young regions | |
346 // marked dirty broke it. Need some reasonable fix. | |
347 guarantee(cl.n() == 0, "Card table should be clean."); | |
348 } | |
349 } else { | |
350 UpdateRSOutOfRegionClosure update_rs(_g1, worker_i); | |
351 _g1->heap_region_iterate(&update_rs); | |
352 // We did a traversal; no further one is necessary. | |
353 if (G1RSBarrierUseQueue) { | |
354 assert(cg1r->do_traversal(), "Or we shouldn't have gotten here."); | |
355 cg1r->set_pya_cancel(); | |
356 } | |
357 if (_cg1r->use_cache()) { | |
358 _cg1r->clear_and_record_card_counts(); | |
359 _cg1r->clear_hot_cache(); | |
360 } | |
361 } | |
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 | |
446 void | |
447 HRInto_G1RemSet::scanNewRefsRS(OopsInHeapRegionClosure* oc, | |
448 int worker_i) { | |
449 double scan_new_refs_start_sec = os::elapsedTime(); | |
450 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
451 CardTableModRefBS* ct_bs = (CardTableModRefBS*) (g1h->barrier_set()); | |
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452 for (int i = 0; i < _new_refs[worker_i]->length(); i++) { |
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453 oop* p = _new_refs[worker_i]->at(i); |
342 | 454 oop obj = *p; |
455 // *p was in the collection set when p was pushed on "_new_refs", but | |
456 // another thread may have processed this location from an RS, so it | |
457 // might not point into the CS any longer. If so, it's obviously been | |
458 // processed, and we don't need to do anything further. | |
459 if (g1h->obj_in_cs(obj)) { | |
460 HeapRegion* r = g1h->heap_region_containing(p); | |
461 | |
462 DEBUG_ONLY(HeapRegion* to = g1h->heap_region_containing(obj)); | |
463 oc->set_region(r); | |
464 // If "p" has already been processed concurrently, this is | |
465 // idempotent. | |
466 oc->do_oop(p); | |
467 } | |
468 } | |
469 _g1p->record_scan_new_refs_time(worker_i, | |
470 (os::elapsedTime() - scan_new_refs_start_sec) | |
471 * 1000.0); | |
472 } | |
473 | |
474 void HRInto_G1RemSet::set_par_traversal(bool b) { | |
475 _par_traversal_in_progress = b; | |
476 HeapRegionRemSet::set_par_traversal(b); | |
477 } | |
478 | |
479 void HRInto_G1RemSet::cleanupHRRS() { | |
480 HeapRegionRemSet::cleanup(); | |
481 } | |
482 | |
483 void | |
484 HRInto_G1RemSet::oops_into_collection_set_do(OopsInHeapRegionClosure* oc, | |
485 int worker_i) { | |
486 #if CARD_REPEAT_HISTO | |
487 ct_freq_update_histo_and_reset(); | |
488 #endif | |
489 if (worker_i == 0) { | |
490 _cg1r->clear_and_record_card_counts(); | |
491 } | |
492 | |
493 // Make this into a command-line flag... | |
494 if (G1RSCountHisto && (ParallelGCThreads == 0 || worker_i == 0)) { | |
495 CountRSSizeClosure count_cl; | |
496 _g1->heap_region_iterate(&count_cl); | |
497 gclog_or_tty->print_cr("Avg of %d RS counts is %f, max is %d, " | |
498 "max region is " PTR_FORMAT, | |
499 count_cl.n(), (float)count_cl.tot()/(float)count_cl.n(), | |
500 count_cl.mx(), count_cl.mxr()); | |
501 count_cl.print_histo(); | |
502 } | |
503 | |
504 if (ParallelGCThreads > 0) { | |
505 // This is a temporary change to serialize the update and scanning | |
506 // of remembered sets. There are some race conditions when this is | |
507 // done in parallel and they are causing failures. When we resolve | |
508 // said race conditions, we'll revert back to parallel remembered | |
509 // set updating and scanning. See CRs 6677707 and 6677708. | |
510 if (worker_i == 0) { | |
511 updateRS(worker_i); | |
512 scanNewRefsRS(oc, worker_i); | |
513 scanRS(oc, worker_i); | |
514 } | |
515 } else { | |
516 assert(worker_i == 0, "invariant"); | |
517 updateRS(0); | |
616
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518 scanNewRefsRS(oc, 0); |
342 | 519 scanRS(oc, 0); |
520 } | |
521 } | |
522 | |
523 void HRInto_G1RemSet:: | |
524 prepare_for_oops_into_collection_set_do() { | |
525 #if G1_REM_SET_LOGGING | |
526 PrintRSClosure cl; | |
527 _g1->collection_set_iterate(&cl); | |
528 #endif | |
529 cleanupHRRS(); | |
530 ConcurrentG1Refine* cg1r = _g1->concurrent_g1_refine(); | |
531 _g1->set_refine_cte_cl_concurrency(false); | |
532 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
533 dcqs.concatenate_logs(); | |
534 | |
535 assert(!_par_traversal_in_progress, "Invariant between iterations."); | |
536 if (ParallelGCThreads > 0) { | |
537 set_par_traversal(true); | |
616
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538 _seq_task->set_par_threads((int)n_workers()); |
342 | 539 if (cg1r->do_traversal()) { |
540 updateRS(0); | |
541 // Have to do this again after updaters | |
542 cleanupHRRS(); | |
543 } | |
544 } | |
545 guarantee( _cards_scanned == NULL, "invariant" ); | |
546 _cards_scanned = NEW_C_HEAP_ARRAY(size_t, n_workers()); | |
545 | 547 for (uint i = 0; i < n_workers(); ++i) { |
548 _cards_scanned[i] = 0; | |
549 } | |
342 | 550 _total_cards_scanned = 0; |
551 } | |
552 | |
553 | |
554 class cleanUpIteratorsClosure : public HeapRegionClosure { | |
555 bool doHeapRegion(HeapRegion *r) { | |
556 HeapRegionRemSet* hrrs = r->rem_set(); | |
557 hrrs->init_for_par_iteration(); | |
558 return false; | |
559 } | |
560 }; | |
561 | |
616
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562 class UpdateRSetOopsIntoCSImmediate : public OopClosure { |
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563 G1CollectedHeap* _g1; |
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564 public: |
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565 UpdateRSetOopsIntoCSImmediate(G1CollectedHeap* g1) : _g1(g1) { } |
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566 virtual void do_oop(narrowOop* p) { |
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567 guarantee(false, "NYI"); |
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568 } |
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569 virtual void do_oop(oop* p) { |
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570 HeapRegion* to = _g1->heap_region_containing(*p); |
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571 if (to->in_collection_set()) { |
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572 if (to->rem_set()->add_reference(p, 0)) { |
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573 _g1->schedule_popular_region_evac(to); |
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574 } |
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575 } |
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576 } |
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577 }; |
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578 |
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579 class UpdateRSetOopsIntoCSDeferred : public OopClosure { |
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580 G1CollectedHeap* _g1; |
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581 CardTableModRefBS* _ct_bs; |
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582 DirtyCardQueue* _dcq; |
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583 public: |
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584 UpdateRSetOopsIntoCSDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
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585 _g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) { } |
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586 virtual void do_oop(narrowOop* p) { |
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587 guarantee(false, "NYI"); |
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588 } |
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589 virtual void do_oop(oop* p) { |
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590 oop obj = *p; |
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591 if (_g1->obj_in_cs(obj)) { |
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592 size_t card_index = _ct_bs->index_for(p); |
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593 if (_ct_bs->mark_card_deferred(card_index)) { |
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594 _dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
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595 } |
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596 } |
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597 } |
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598 }; |
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599 |
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600 void HRInto_G1RemSet::new_refs_iterate(OopClosure* cl) { |
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601 for (size_t i = 0; i < n_workers(); i++) { |
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602 for (int j = 0; j < _new_refs[i]->length(); j++) { |
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603 oop* p = _new_refs[i]->at(j); |
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604 cl->do_oop(p); |
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605 } |
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606 } |
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607 } |
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608 |
342 | 609 void HRInto_G1RemSet::cleanup_after_oops_into_collection_set_do() { |
610 guarantee( _cards_scanned != NULL, "invariant" ); | |
611 _total_cards_scanned = 0; | |
612 for (uint i = 0; i < n_workers(); ++i) | |
613 _total_cards_scanned += _cards_scanned[i]; | |
614 FREE_C_HEAP_ARRAY(size_t, _cards_scanned); | |
615 _cards_scanned = NULL; | |
616 // Cleanup after copy | |
617 #if G1_REM_SET_LOGGING | |
618 PrintRSClosure cl; | |
619 _g1->heap_region_iterate(&cl); | |
620 #endif | |
621 _g1->set_refine_cte_cl_concurrency(true); | |
622 cleanUpIteratorsClosure iterClosure; | |
623 _g1->collection_set_iterate(&iterClosure); | |
624 // Set all cards back to clean. | |
625 _g1->cleanUpCardTable(); | |
626 if (ParallelGCThreads > 0) { | |
627 ConcurrentG1Refine* cg1r = _g1->concurrent_g1_refine(); | |
628 if (cg1r->do_traversal()) { | |
629 cg1r->cg1rThread()->set_do_traversal(false); | |
630 } | |
631 set_par_traversal(false); | |
632 } | |
616
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633 |
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634 if (_g1->evacuation_failed()) { |
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635 // Restore remembered sets for the regions pointing into |
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636 // the collection set. |
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637 if (G1DeferredRSUpdate) { |
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638 DirtyCardQueue dcq(&_g1->dirty_card_queue_set()); |
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639 UpdateRSetOopsIntoCSDeferred deferred_update(_g1, &dcq); |
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640 new_refs_iterate(&deferred_update); |
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641 } else { |
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642 UpdateRSetOopsIntoCSImmediate immediate_update(_g1); |
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643 new_refs_iterate(&immediate_update); |
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644 } |
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645 } |
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646 for (uint i = 0; i < n_workers(); i++) { |
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647 _new_refs[i]->clear(); |
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648 } |
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649 |
342 | 650 assert(!_par_traversal_in_progress, "Invariant between iterations."); |
651 } | |
652 | |
653 class UpdateRSObjectClosure: public ObjectClosure { | |
654 UpdateRSOopClosure* _update_rs_oop_cl; | |
655 public: | |
656 UpdateRSObjectClosure(UpdateRSOopClosure* update_rs_oop_cl) : | |
657 _update_rs_oop_cl(update_rs_oop_cl) {} | |
658 void do_object(oop obj) { | |
659 obj->oop_iterate(_update_rs_oop_cl); | |
660 } | |
661 | |
662 }; | |
663 | |
664 class ScrubRSClosure: public HeapRegionClosure { | |
665 G1CollectedHeap* _g1h; | |
666 BitMap* _region_bm; | |
667 BitMap* _card_bm; | |
668 CardTableModRefBS* _ctbs; | |
669 public: | |
670 ScrubRSClosure(BitMap* region_bm, BitMap* card_bm) : | |
671 _g1h(G1CollectedHeap::heap()), | |
672 _region_bm(region_bm), _card_bm(card_bm), | |
673 _ctbs(NULL) | |
674 { | |
675 ModRefBarrierSet* bs = _g1h->mr_bs(); | |
676 guarantee(bs->is_a(BarrierSet::CardTableModRef), "Precondition"); | |
677 _ctbs = (CardTableModRefBS*)bs; | |
678 } | |
679 | |
680 bool doHeapRegion(HeapRegion* r) { | |
681 if (!r->continuesHumongous()) { | |
682 r->rem_set()->scrub(_ctbs, _region_bm, _card_bm); | |
683 } | |
684 return false; | |
685 } | |
686 }; | |
687 | |
688 void HRInto_G1RemSet::scrub(BitMap* region_bm, BitMap* card_bm) { | |
689 ScrubRSClosure scrub_cl(region_bm, card_bm); | |
690 _g1->heap_region_iterate(&scrub_cl); | |
691 } | |
692 | |
693 void HRInto_G1RemSet::scrub_par(BitMap* region_bm, BitMap* card_bm, | |
694 int worker_num, int claim_val) { | |
695 ScrubRSClosure scrub_cl(region_bm, card_bm); | |
696 _g1->heap_region_par_iterate_chunked(&scrub_cl, worker_num, claim_val); | |
697 } | |
698 | |
699 | |
700 class ConcRefineRegionClosure: public HeapRegionClosure { | |
701 G1CollectedHeap* _g1h; | |
702 CardTableModRefBS* _ctbs; | |
703 ConcurrentGCThread* _cgc_thrd; | |
704 ConcurrentG1Refine* _cg1r; | |
705 unsigned _cards_processed; | |
706 UpdateRSOopClosure _update_rs_oop_cl; | |
707 public: | |
708 ConcRefineRegionClosure(CardTableModRefBS* ctbs, | |
709 ConcurrentG1Refine* cg1r, | |
710 HRInto_G1RemSet* g1rs) : | |
711 _ctbs(ctbs), _cg1r(cg1r), _cgc_thrd(cg1r->cg1rThread()), | |
712 _update_rs_oop_cl(g1rs), _cards_processed(0), | |
713 _g1h(G1CollectedHeap::heap()) | |
714 {} | |
715 | |
716 bool doHeapRegion(HeapRegion* r) { | |
717 if (!r->in_collection_set() && | |
718 !r->continuesHumongous() && | |
616
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719 !r->is_young() && |
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720 !r->is_survivor()) { |
342 | 721 _update_rs_oop_cl.set_from(r); |
722 UpdateRSObjectClosure update_rs_obj_cl(&_update_rs_oop_cl); | |
723 | |
724 // For each run of dirty card in the region: | |
725 // 1) Clear the cards. | |
726 // 2) Process the range corresponding to the run, adding any | |
727 // necessary RS entries. | |
728 // 1 must precede 2, so that a concurrent modification redirties the | |
729 // card. If a processing attempt does not succeed, because it runs | |
730 // into an unparseable region, we will do binary search to find the | |
731 // beginning of the next parseable region. | |
732 HeapWord* startAddr = r->bottom(); | |
733 HeapWord* endAddr = r->used_region().end(); | |
734 HeapWord* lastAddr; | |
735 HeapWord* nextAddr; | |
736 | |
737 for (nextAddr = lastAddr = startAddr; | |
738 nextAddr < endAddr; | |
739 nextAddr = lastAddr) { | |
740 MemRegion dirtyRegion; | |
741 | |
742 // Get and clear dirty region from card table | |
743 MemRegion next_mr(nextAddr, endAddr); | |
744 dirtyRegion = | |
745 _ctbs->dirty_card_range_after_reset( | |
746 next_mr, | |
747 true, CardTableModRefBS::clean_card_val()); | |
748 assert(dirtyRegion.start() >= nextAddr, | |
749 "returned region inconsistent?"); | |
750 | |
751 if (!dirtyRegion.is_empty()) { | |
752 HeapWord* stop_point = | |
753 r->object_iterate_mem_careful(dirtyRegion, | |
754 &update_rs_obj_cl); | |
755 if (stop_point == NULL) { | |
756 lastAddr = dirtyRegion.end(); | |
757 _cards_processed += | |
758 (int) (dirtyRegion.word_size() / CardTableModRefBS::card_size_in_words); | |
759 } else { | |
760 // We're going to skip one or more cards that we can't parse. | |
761 HeapWord* next_parseable_card = | |
762 r->next_block_start_careful(stop_point); | |
763 // Round this up to a card boundary. | |
764 next_parseable_card = | |
765 _ctbs->addr_for(_ctbs->byte_after_const(next_parseable_card)); | |
766 // Now we invalidate the intervening cards so we'll see them | |
767 // again. | |
768 MemRegion remaining_dirty = | |
769 MemRegion(stop_point, dirtyRegion.end()); | |
770 MemRegion skipped = | |
771 MemRegion(stop_point, next_parseable_card); | |
772 _ctbs->invalidate(skipped.intersection(remaining_dirty)); | |
773 | |
774 // Now start up again where we can parse. | |
775 lastAddr = next_parseable_card; | |
776 | |
777 // Count how many we did completely. | |
778 _cards_processed += | |
779 (stop_point - dirtyRegion.start()) / | |
780 CardTableModRefBS::card_size_in_words; | |
781 } | |
782 // Allow interruption at regular intervals. | |
783 // (Might need to make them more regular, if we get big | |
784 // dirty regions.) | |
785 if (_cgc_thrd != NULL) { | |
786 if (_cgc_thrd->should_yield()) { | |
787 _cgc_thrd->yield(); | |
788 switch (_cg1r->get_pya()) { | |
789 case PYA_continue: | |
790 // This may have changed: re-read. | |
791 endAddr = r->used_region().end(); | |
792 continue; | |
793 case PYA_restart: case PYA_cancel: | |
794 return true; | |
795 } | |
796 } | |
797 } | |
798 } else { | |
799 break; | |
800 } | |
801 } | |
802 } | |
803 // A good yield opportunity. | |
804 if (_cgc_thrd != NULL) { | |
805 if (_cgc_thrd->should_yield()) { | |
806 _cgc_thrd->yield(); | |
807 switch (_cg1r->get_pya()) { | |
808 case PYA_restart: case PYA_cancel: | |
809 return true; | |
810 default: | |
811 break; | |
812 } | |
813 | |
814 } | |
815 } | |
816 return false; | |
817 } | |
818 | |
819 unsigned cards_processed() { return _cards_processed; } | |
820 }; | |
821 | |
822 | |
823 void HRInto_G1RemSet::concurrentRefinementPass(ConcurrentG1Refine* cg1r) { | |
824 ConcRefineRegionClosure cr_cl(ct_bs(), cg1r, this); | |
825 _g1->heap_region_iterate(&cr_cl); | |
826 _conc_refine_traversals++; | |
827 _conc_refine_cards += cr_cl.cards_processed(); | |
828 } | |
829 | |
830 static IntHistogram out_of_histo(50, 50); | |
831 | |
832 | |
833 | |
834 void HRInto_G1RemSet::concurrentRefineOneCard(jbyte* card_ptr, int worker_i) { | |
835 // If the card is no longer dirty, nothing to do. | |
836 if (*card_ptr != CardTableModRefBS::dirty_card_val()) return; | |
837 | |
838 // Construct the region representing the card. | |
839 HeapWord* start = _ct_bs->addr_for(card_ptr); | |
840 // And find the region containing it. | |
841 HeapRegion* r = _g1->heap_region_containing(start); | |
842 if (r == NULL) { | |
843 guarantee(_g1->is_in_permanent(start), "Or else where?"); | |
844 return; // Not in the G1 heap (might be in perm, for example.) | |
845 } | |
846 // Why do we have to check here whether a card is on a young region, | |
847 // given that we dirty young regions and, as a result, the | |
848 // post-barrier is supposed to filter them out and never to enqueue | |
849 // them? When we allocate a new region as the "allocation region" we | |
850 // actually dirty its cards after we release the lock, since card | |
851 // dirtying while holding the lock was a performance bottleneck. So, | |
852 // as a result, it is possible for other threads to actually | |
853 // allocate objects in the region (after the acquire the lock) | |
854 // before all the cards on the region are dirtied. This is unlikely, | |
855 // and it doesn't happen often, but it can happen. So, the extra | |
856 // check below filters out those cards. | |
616
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6720309: G1: don't synchronously update RSet during evacuation pauses
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857 if (r->is_young() || r->is_survivor()) { |
342 | 858 return; |
859 } | |
860 // While we are processing RSet buffers during the collection, we | |
861 // actually don't want to scan any cards on the collection set, | |
862 // since we don't want to update remebered sets with entries that | |
863 // point into the collection set, given that live objects from the | |
864 // collection set are about to move and such entries will be stale | |
865 // very soon. This change also deals with a reliability issue which | |
866 // involves scanning a card in the collection set and coming across | |
867 // an array that was being chunked and looking malformed. Note, | |
868 // however, that if evacuation fails, we have to scan any objects | |
869 // that were not moved and create any missing entries. | |
870 if (r->in_collection_set()) { | |
871 return; | |
872 } | |
873 | |
874 // Should we defer it? | |
875 if (_cg1r->use_cache()) { | |
876 card_ptr = _cg1r->cache_insert(card_ptr); | |
877 // If it was not an eviction, nothing to do. | |
878 if (card_ptr == NULL) return; | |
879 | |
880 // OK, we have to reset the card start, region, etc. | |
881 start = _ct_bs->addr_for(card_ptr); | |
882 r = _g1->heap_region_containing(start); | |
883 if (r == NULL) { | |
884 guarantee(_g1->is_in_permanent(start), "Or else where?"); | |
885 return; // Not in the G1 heap (might be in perm, for example.) | |
886 } | |
887 guarantee(!r->is_young(), "It was evicted in the current minor cycle."); | |
888 } | |
889 | |
890 HeapWord* end = _ct_bs->addr_for(card_ptr + 1); | |
891 MemRegion dirtyRegion(start, end); | |
892 | |
893 #if CARD_REPEAT_HISTO | |
894 init_ct_freq_table(_g1->g1_reserved_obj_bytes()); | |
895 ct_freq_note_card(_ct_bs->index_for(start)); | |
896 #endif | |
897 | |
898 UpdateRSOopClosure update_rs_oop_cl(this, worker_i); | |
899 update_rs_oop_cl.set_from(r); | |
900 FilterOutOfRegionClosure filter_then_update_rs_oop_cl(r, &update_rs_oop_cl); | |
901 | |
902 // Undirty the card. | |
903 *card_ptr = CardTableModRefBS::clean_card_val(); | |
904 // We must complete this write before we do any of the reads below. | |
905 OrderAccess::storeload(); | |
906 // And process it, being careful of unallocated portions of TLAB's. | |
907 HeapWord* stop_point = | |
908 r->oops_on_card_seq_iterate_careful(dirtyRegion, | |
909 &filter_then_update_rs_oop_cl); | |
910 // If stop_point is non-null, then we encountered an unallocated region | |
911 // (perhaps the unfilled portion of a TLAB.) For now, we'll dirty the | |
912 // card and re-enqueue: if we put off the card until a GC pause, then the | |
913 // unallocated portion will be filled in. Alternatively, we might try | |
914 // the full complexity of the technique used in "regular" precleaning. | |
915 if (stop_point != NULL) { | |
916 // The card might have gotten re-dirtied and re-enqueued while we | |
917 // worked. (In fact, it's pretty likely.) | |
918 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { | |
919 *card_ptr = CardTableModRefBS::dirty_card_val(); | |
920 MutexLockerEx x(Shared_DirtyCardQ_lock, | |
921 Mutex::_no_safepoint_check_flag); | |
922 DirtyCardQueue* sdcq = | |
923 JavaThread::dirty_card_queue_set().shared_dirty_card_queue(); | |
924 sdcq->enqueue(card_ptr); | |
925 } | |
926 } else { | |
927 out_of_histo.add_entry(filter_then_update_rs_oop_cl.out_of_region()); | |
928 _conc_refine_cards++; | |
929 } | |
930 } | |
931 | |
932 class HRRSStatsIter: public HeapRegionClosure { | |
933 size_t _occupied; | |
934 size_t _total_mem_sz; | |
935 size_t _max_mem_sz; | |
936 HeapRegion* _max_mem_sz_region; | |
937 public: | |
938 HRRSStatsIter() : | |
939 _occupied(0), | |
940 _total_mem_sz(0), | |
941 _max_mem_sz(0), | |
942 _max_mem_sz_region(NULL) | |
943 {} | |
944 | |
945 bool doHeapRegion(HeapRegion* r) { | |
946 if (r->continuesHumongous()) return false; | |
947 size_t mem_sz = r->rem_set()->mem_size(); | |
948 if (mem_sz > _max_mem_sz) { | |
949 _max_mem_sz = mem_sz; | |
950 _max_mem_sz_region = r; | |
951 } | |
952 _total_mem_sz += mem_sz; | |
953 size_t occ = r->rem_set()->occupied(); | |
954 _occupied += occ; | |
955 return false; | |
956 } | |
957 size_t total_mem_sz() { return _total_mem_sz; } | |
958 size_t max_mem_sz() { return _max_mem_sz; } | |
959 size_t occupied() { return _occupied; } | |
960 HeapRegion* max_mem_sz_region() { return _max_mem_sz_region; } | |
961 }; | |
962 | |
963 void HRInto_G1RemSet::print_summary_info() { | |
964 G1CollectedHeap* g1 = G1CollectedHeap::heap(); | |
965 ConcurrentG1RefineThread* cg1r_thrd = | |
966 g1->concurrent_g1_refine()->cg1rThread(); | |
967 | |
968 #if CARD_REPEAT_HISTO | |
969 gclog_or_tty->print_cr("\nG1 card_repeat count histogram: "); | |
970 gclog_or_tty->print_cr(" # of repeats --> # of cards with that number."); | |
971 card_repeat_count.print_on(gclog_or_tty); | |
972 #endif | |
973 | |
974 if (FILTEROUTOFREGIONCLOSURE_DOHISTOGRAMCOUNT) { | |
975 gclog_or_tty->print_cr("\nG1 rem-set out-of-region histogram: "); | |
976 gclog_or_tty->print_cr(" # of CS ptrs --> # of cards with that number."); | |
977 out_of_histo.print_on(gclog_or_tty); | |
978 } | |
979 gclog_or_tty->print_cr("\n Concurrent RS processed %d cards in " | |
980 "%5.2fs.", | |
981 _conc_refine_cards, cg1r_thrd->vtime_accum()); | |
982 | |
983 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
984 jint tot_processed_buffers = | |
985 dcqs.processed_buffers_mut() + dcqs.processed_buffers_rs_thread(); | |
986 gclog_or_tty->print_cr(" Of %d completed buffers:", tot_processed_buffers); | |
987 gclog_or_tty->print_cr(" %8d (%5.1f%%) by conc RS thread.", | |
988 dcqs.processed_buffers_rs_thread(), | |
989 100.0*(float)dcqs.processed_buffers_rs_thread()/ | |
990 (float)tot_processed_buffers); | |
991 gclog_or_tty->print_cr(" %8d (%5.1f%%) by mutator threads.", | |
992 dcqs.processed_buffers_mut(), | |
993 100.0*(float)dcqs.processed_buffers_mut()/ | |
994 (float)tot_processed_buffers); | |
995 gclog_or_tty->print_cr(" Did %d concurrent refinement traversals.", | |
996 _conc_refine_traversals); | |
997 if (!G1RSBarrierUseQueue) { | |
998 gclog_or_tty->print_cr(" Scanned %8.2f cards/traversal.", | |
999 _conc_refine_traversals > 0 ? | |
1000 (float)_conc_refine_cards/(float)_conc_refine_traversals : | |
1001 0); | |
1002 } | |
1003 gclog_or_tty->print_cr(""); | |
1004 if (G1UseHRIntoRS) { | |
1005 HRRSStatsIter blk; | |
1006 g1->heap_region_iterate(&blk); | |
1007 gclog_or_tty->print_cr(" Total heap region rem set sizes = " SIZE_FORMAT "K." | |
1008 " Max = " SIZE_FORMAT "K.", | |
1009 blk.total_mem_sz()/K, blk.max_mem_sz()/K); | |
1010 gclog_or_tty->print_cr(" Static structures = " SIZE_FORMAT "K," | |
1011 " free_lists = " SIZE_FORMAT "K.", | |
1012 HeapRegionRemSet::static_mem_size()/K, | |
1013 HeapRegionRemSet::fl_mem_size()/K); | |
1014 gclog_or_tty->print_cr(" %d occupied cards represented.", | |
1015 blk.occupied()); | |
1016 gclog_or_tty->print_cr(" Max sz region = [" PTR_FORMAT ", " PTR_FORMAT " )" | |
1017 " %s, cap = " SIZE_FORMAT "K, occ = " SIZE_FORMAT "K.", | |
1018 blk.max_mem_sz_region()->bottom(), blk.max_mem_sz_region()->end(), | |
1019 (blk.max_mem_sz_region()->popular() ? "POP" : ""), | |
1020 (blk.max_mem_sz_region()->rem_set()->mem_size() + K - 1)/K, | |
1021 (blk.max_mem_sz_region()->rem_set()->occupied() + K - 1)/K); | |
1022 gclog_or_tty->print_cr(" Did %d coarsenings.", | |
1023 HeapRegionRemSet::n_coarsenings()); | |
1024 | |
1025 } | |
1026 } | |
1027 void HRInto_G1RemSet::prepare_for_verify() { | |
1028 if (G1HRRSFlushLogBuffersOnVerify && VerifyBeforeGC && !_g1->full_collection()) { | |
1029 cleanupHRRS(); | |
1030 _g1->set_refine_cte_cl_concurrency(false); | |
1031 if (SafepointSynchronize::is_at_safepoint()) { | |
1032 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1033 dcqs.concatenate_logs(); | |
1034 } | |
1035 bool cg1r_use_cache = _cg1r->use_cache(); | |
1036 _cg1r->set_use_cache(false); | |
1037 updateRS(0); | |
1038 _cg1r->set_use_cache(cg1r_use_cache); | |
1039 } | |
1040 } |