Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1RemSet.cpp @ 3446:07c2e7ffd1fc
7047697: MethodHandle.invokeExact call for wrong method causes VM failure if run with -Xcomp
Reviewed-by: never, twisti
author | jrose |
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date | Wed, 08 Jun 2011 17:04:06 -0700 |
parents | 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 DirtyCardToOopClosure* cl = | |
161 r->new_dcto_closure(_oc, | |
162 CardTableModRefBS::Precise, | |
163 HeapRegionDCTOC::IntoCSFilterKind); | |
164 | |
165 // Set the "from" region in the closure. | |
166 _oc->set_region(r); | |
167 HeapWord* card_start = _bot_shared->address_for_index(index); | |
168 HeapWord* card_end = card_start + G1BlockOffsetSharedArray::N_words; | |
169 Space *sp = SharedHeap::heap()->space_containing(card_start); | |
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170 MemRegion sm_region = sp->used_region_at_save_marks(); |
342 | 171 MemRegion mr = sm_region.intersection(MemRegion(card_start,card_end)); |
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172 if (!mr.is_empty() && !_ct_bs->is_card_claimed(index)) { |
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173 // We make the card as "claimed" lazily (so races are possible |
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174 // but they're benign), which reduces the number of duplicate |
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175 // scans (the rsets of the regions in the cset can intersect). |
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176 _ct_bs->set_card_claimed(index); |
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177 _cards_done++; |
342 | 178 cl->do_MemRegion(mr); |
179 } | |
180 } | |
181 | |
182 void printCard(HeapRegion* card_region, size_t card_index, | |
183 HeapWord* card_start) { | |
184 gclog_or_tty->print_cr("T %d Region [" PTR_FORMAT ", " PTR_FORMAT ") " | |
185 "RS names card %p: " | |
186 "[" PTR_FORMAT ", " PTR_FORMAT ")", | |
187 _worker_i, | |
188 card_region->bottom(), card_region->end(), | |
189 card_index, | |
190 card_start, card_start + G1BlockOffsetSharedArray::N_words); | |
191 } | |
192 | |
193 bool doHeapRegion(HeapRegion* r) { | |
194 assert(r->in_collection_set(), "should only be called on elements of CS."); | |
195 HeapRegionRemSet* hrrs = r->rem_set(); | |
196 if (hrrs->iter_is_complete()) return false; // All done. | |
197 if (!_try_claimed && !hrrs->claim_iter()) return false; | |
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198 // If we ever free the collection set concurrently, we should also |
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199 // clear the card table concurrently therefore we won't need to |
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200 // add regions of the collection set to the dirty cards region. |
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201 _g1h->push_dirty_cards_region(r); |
342 | 202 // If we didn't return above, then |
203 // _try_claimed || r->claim_iter() | |
204 // is true: either we're supposed to work on claimed-but-not-complete | |
205 // regions, or we successfully claimed the region. | |
206 HeapRegionRemSetIterator* iter = _g1h->rem_set_iterator(_worker_i); | |
207 hrrs->init_iterator(iter); | |
208 size_t card_index; | |
1261 | 209 |
210 // We claim cards in block so as to recude the contention. The block size is determined by | |
211 // the G1RSetScanBlockSize parameter. | |
212 size_t jump_to_card = hrrs->iter_claimed_next(_block_size); | |
213 for (size_t current_card = 0; iter->has_next(card_index); current_card++) { | |
214 if (current_card >= jump_to_card + _block_size) { | |
215 jump_to_card = hrrs->iter_claimed_next(_block_size); | |
747 | 216 } |
1261 | 217 if (current_card < jump_to_card) continue; |
342 | 218 HeapWord* card_start = _g1h->bot_shared()->address_for_index(card_index); |
219 #if 0 | |
220 gclog_or_tty->print("Rem set iteration yielded card [" PTR_FORMAT ", " PTR_FORMAT ").\n", | |
221 card_start, card_start + CardTableModRefBS::card_size_in_words); | |
222 #endif | |
223 | |
224 HeapRegion* card_region = _g1h->heap_region_containing(card_start); | |
225 assert(card_region != NULL, "Yielding cards not in the heap?"); | |
226 _cards++; | |
227 | |
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228 if (!card_region->is_on_dirty_cards_region_list()) { |
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229 _g1h->push_dirty_cards_region(card_region); |
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230 } |
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231 |
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232 // If the card is dirty, then we will scan it during updateRS. |
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233 if (!card_region->in_collection_set() && |
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234 !_ct_bs->is_card_dirty(card_index)) { |
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235 scanCard(card_index, card_region); |
342 | 236 } |
237 } | |
747 | 238 if (!_try_claimed) { |
239 hrrs->set_iter_complete(); | |
240 } | |
342 | 241 return false; |
242 } | |
243 size_t cards_done() { return _cards_done;} | |
244 size_t cards_looked_up() { return _cards;} | |
245 }; | |
246 | |
247 // We want the parallel threads to start their scanning at | |
248 // different collection set regions to avoid contention. | |
249 // If we have: | |
250 // n collection set regions | |
251 // p threads | |
252 // Then thread t will start at region t * floor (n/p) | |
253 | |
1861 | 254 HeapRegion* G1RemSet::calculateStartRegion(int worker_i) { |
342 | 255 HeapRegion* result = _g1p->collection_set(); |
256 if (ParallelGCThreads > 0) { | |
257 size_t cs_size = _g1p->collection_set_size(); | |
258 int n_workers = _g1->workers()->total_workers(); | |
259 size_t cs_spans = cs_size / n_workers; | |
260 size_t ind = cs_spans * worker_i; | |
261 for (size_t i = 0; i < ind; i++) | |
262 result = result->next_in_collection_set(); | |
263 } | |
264 return result; | |
265 } | |
266 | |
1861 | 267 void G1RemSet::scanRS(OopsInHeapRegionClosure* oc, int worker_i) { |
342 | 268 double rs_time_start = os::elapsedTime(); |
269 HeapRegion *startRegion = calculateStartRegion(worker_i); | |
270 | |
1261 | 271 ScanRSClosure scanRScl(oc, worker_i); |
342 | 272 _g1->collection_set_iterate_from(startRegion, &scanRScl); |
273 scanRScl.set_try_claimed(); | |
274 _g1->collection_set_iterate_from(startRegion, &scanRScl); | |
275 | |
1261 | 276 double scan_rs_time_sec = os::elapsedTime() - rs_time_start; |
342 | 277 |
278 assert( _cards_scanned != NULL, "invariant" ); | |
279 _cards_scanned[worker_i] = scanRScl.cards_done(); | |
280 | |
281 _g1p->record_scan_rs_time(worker_i, scan_rs_time_sec * 1000.0); | |
282 } | |
283 | |
1705 | 284 // Closure used for updating RSets and recording references that |
285 // point into the collection set. Only called during an | |
286 // evacuation pause. | |
287 | |
288 class RefineRecordRefsIntoCSCardTableEntryClosure: public CardTableEntryClosure { | |
289 G1RemSet* _g1rs; | |
290 DirtyCardQueue* _into_cset_dcq; | |
291 public: | |
292 RefineRecordRefsIntoCSCardTableEntryClosure(G1CollectedHeap* g1h, | |
293 DirtyCardQueue* into_cset_dcq) : | |
294 _g1rs(g1h->g1_rem_set()), _into_cset_dcq(into_cset_dcq) | |
295 {} | |
296 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
297 // The only time we care about recording cards that | |
298 // contain references that point into the collection set | |
299 // is during RSet updating within an evacuation pause. | |
300 // In this case worker_i should be the id of a GC worker thread. | |
301 assert(SafepointSynchronize::is_at_safepoint(), "not during an evacuation pause"); | |
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302 assert(worker_i < (int) (ParallelGCThreads == 0 ? 1 : ParallelGCThreads), "should be a GC worker"); |
342 | 303 |
1705 | 304 if (_g1rs->concurrentRefineOneCard(card_ptr, worker_i, true)) { |
305 // 'card_ptr' contains references that point into the collection | |
306 // set. We need to record the card in the DCQS | |
307 // (G1CollectedHeap::into_cset_dirty_card_queue_set()) | |
308 // that's used for that purpose. | |
309 // | |
310 // Enqueue the card | |
311 _into_cset_dcq->enqueue(card_ptr); | |
312 } | |
313 return true; | |
314 } | |
315 }; | |
316 | |
1861 | 317 void G1RemSet::updateRS(DirtyCardQueue* into_cset_dcq, int worker_i) { |
342 | 318 double start = os::elapsedTime(); |
1705 | 319 // Apply the given closure to all remaining log entries. |
320 RefineRecordRefsIntoCSCardTableEntryClosure into_cset_update_rs_cl(_g1, into_cset_dcq); | |
321 _g1->iterate_dirty_card_closure(&into_cset_update_rs_cl, into_cset_dcq, false, worker_i); | |
322 | |
794 | 323 // Now there should be no dirty cards. |
324 if (G1RSLogCheckCardTable) { | |
325 CountNonCleanMemRegionClosure cl(_g1); | |
326 _ct_bs->mod_card_iterate(&cl); | |
327 // XXX This isn't true any more: keeping cards of young regions | |
328 // marked dirty broke it. Need some reasonable fix. | |
329 guarantee(cl.n() == 0, "Card table should be clean."); | |
342 | 330 } |
794 | 331 |
342 | 332 _g1p->record_update_rs_time(worker_i, (os::elapsedTime() - start) * 1000.0); |
333 } | |
334 | |
335 #ifndef PRODUCT | |
336 class PrintRSClosure : public HeapRegionClosure { | |
337 int _count; | |
338 public: | |
339 PrintRSClosure() : _count(0) {} | |
340 bool doHeapRegion(HeapRegion* r) { | |
341 HeapRegionRemSet* hrrs = r->rem_set(); | |
342 _count += (int) hrrs->occupied(); | |
343 if (hrrs->occupied() == 0) { | |
344 gclog_or_tty->print("Heap Region [" PTR_FORMAT ", " PTR_FORMAT ") " | |
345 "has no remset entries\n", | |
346 r->bottom(), r->end()); | |
347 } else { | |
348 gclog_or_tty->print("Printing rem set for heap region [" PTR_FORMAT ", " PTR_FORMAT ")\n", | |
349 r->bottom(), r->end()); | |
350 r->print(); | |
351 hrrs->print(); | |
352 gclog_or_tty->print("\nDone printing rem set\n"); | |
353 } | |
354 return false; | |
355 } | |
356 int occupied() {return _count;} | |
357 }; | |
358 #endif | |
359 | |
360 class CountRSSizeClosure: public HeapRegionClosure { | |
361 size_t _n; | |
362 size_t _tot; | |
363 size_t _max; | |
364 HeapRegion* _max_r; | |
365 enum { | |
366 N = 20, | |
367 MIN = 6 | |
368 }; | |
369 int _histo[N]; | |
370 public: | |
371 CountRSSizeClosure() : _n(0), _tot(0), _max(0), _max_r(NULL) { | |
372 for (int i = 0; i < N; i++) _histo[i] = 0; | |
373 } | |
374 bool doHeapRegion(HeapRegion* r) { | |
375 if (!r->continuesHumongous()) { | |
376 size_t occ = r->rem_set()->occupied(); | |
377 _n++; | |
378 _tot += occ; | |
379 if (occ > _max) { | |
380 _max = occ; | |
381 _max_r = r; | |
382 } | |
383 // Fit it into a histo bin. | |
384 int s = 1 << MIN; | |
385 int i = 0; | |
386 while (occ > (size_t) s && i < (N-1)) { | |
387 s = s << 1; | |
388 i++; | |
389 } | |
390 _histo[i]++; | |
391 } | |
392 return false; | |
393 } | |
394 size_t n() { return _n; } | |
395 size_t tot() { return _tot; } | |
396 size_t mx() { return _max; } | |
397 HeapRegion* mxr() { return _max_r; } | |
398 void print_histo() { | |
399 int mx = N; | |
400 while (mx >= 0) { | |
401 if (_histo[mx-1] > 0) break; | |
402 mx--; | |
403 } | |
404 gclog_or_tty->print_cr("Number of regions with given RS sizes:"); | |
405 gclog_or_tty->print_cr(" <= %8d %8d", 1 << MIN, _histo[0]); | |
406 for (int i = 1; i < mx-1; i++) { | |
407 gclog_or_tty->print_cr(" %8d - %8d %8d", | |
408 (1 << (MIN + i - 1)) + 1, | |
409 1 << (MIN + i), | |
410 _histo[i]); | |
411 } | |
412 gclog_or_tty->print_cr(" > %8d %8d", (1 << (MIN+mx-2))+1, _histo[mx-1]); | |
413 } | |
414 }; | |
415 | |
1861 | 416 void G1RemSet::cleanupHRRS() { |
342 | 417 HeapRegionRemSet::cleanup(); |
418 } | |
419 | |
1861 | 420 void G1RemSet::oops_into_collection_set_do(OopsInHeapRegionClosure* oc, |
342 | 421 int worker_i) { |
422 #if CARD_REPEAT_HISTO | |
423 ct_freq_update_histo_and_reset(); | |
424 #endif | |
425 if (worker_i == 0) { | |
426 _cg1r->clear_and_record_card_counts(); | |
427 } | |
428 | |
429 // Make this into a command-line flag... | |
430 if (G1RSCountHisto && (ParallelGCThreads == 0 || worker_i == 0)) { | |
431 CountRSSizeClosure count_cl; | |
432 _g1->heap_region_iterate(&count_cl); | |
433 gclog_or_tty->print_cr("Avg of %d RS counts is %f, max is %d, " | |
434 "max region is " PTR_FORMAT, | |
435 count_cl.n(), (float)count_cl.tot()/(float)count_cl.n(), | |
436 count_cl.mx(), count_cl.mxr()); | |
437 count_cl.print_histo(); | |
438 } | |
439 | |
1705 | 440 // We cache the value of 'oc' closure into the appropriate slot in the |
441 // _cset_rs_update_cl for this worker | |
442 assert(worker_i < (int)n_workers(), "sanity"); | |
443 _cset_rs_update_cl[worker_i] = oc; | |
444 | |
445 // A DirtyCardQueue that is used to hold cards containing references | |
446 // that point into the collection set. This DCQ is associated with a | |
447 // special DirtyCardQueueSet (see g1CollectedHeap.hpp). Under normal | |
448 // circumstances (i.e. the pause successfully completes), these cards | |
449 // are just discarded (there's no need to update the RSets of regions | |
450 // that were in the collection set - after the pause these regions | |
451 // are wholly 'free' of live objects. In the event of an evacuation | |
452 // failure the cards/buffers in this queue set are: | |
453 // * passed to the DirtyCardQueueSet that is used to manage deferred | |
454 // RSet updates, or | |
455 // * scanned for references that point into the collection set | |
456 // and the RSet of the corresponding region in the collection set | |
457 // is updated immediately. | |
458 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); | |
459 | |
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460 assert((ParallelGCThreads > 0) || worker_i == 0, "invariant"); |
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461 |
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462 // The two flags below were introduced temporarily to serialize |
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463 // the updating and scanning of remembered sets. There are some |
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464 // race conditions when these two operations are done in parallel |
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465 // and they are causing failures. When we resolve said race |
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466 // conditions, we'll revert back to parallel remembered set |
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467 // updating and scanning. See CRs 6677707 and 6677708. |
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468 if (G1UseParallelRSetUpdating || (worker_i == 0)) { |
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469 updateRS(&into_cset_dcq, worker_i); |
342 | 470 } else { |
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471 _g1p->record_update_rs_processed_buffers(worker_i, 0.0); |
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472 _g1p->record_update_rs_time(worker_i, 0.0); |
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473 } |
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474 if (G1UseParallelRSetScanning || (worker_i == 0)) { |
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475 scanRS(oc, worker_i); |
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476 } else { |
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477 _g1p->record_scan_rs_time(worker_i, 0.0); |
342 | 478 } |
1705 | 479 |
480 // We now clear the cached values of _cset_rs_update_cl for this worker | |
481 _cset_rs_update_cl[worker_i] = NULL; | |
342 | 482 } |
483 | |
1861 | 484 void G1RemSet::prepare_for_oops_into_collection_set_do() { |
342 | 485 #if G1_REM_SET_LOGGING |
486 PrintRSClosure cl; | |
487 _g1->collection_set_iterate(&cl); | |
488 #endif | |
489 cleanupHRRS(); | |
490 ConcurrentG1Refine* cg1r = _g1->concurrent_g1_refine(); | |
491 _g1->set_refine_cte_cl_concurrency(false); | |
492 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
493 dcqs.concatenate_logs(); | |
494 | |
495 if (ParallelGCThreads > 0) { | |
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496 _seq_task->set_n_threads((int)n_workers()); |
342 | 497 } |
498 guarantee( _cards_scanned == NULL, "invariant" ); | |
499 _cards_scanned = NEW_C_HEAP_ARRAY(size_t, n_workers()); | |
545 | 500 for (uint i = 0; i < n_workers(); ++i) { |
501 _cards_scanned[i] = 0; | |
502 } | |
342 | 503 _total_cards_scanned = 0; |
504 } | |
505 | |
506 | |
507 class cleanUpIteratorsClosure : public HeapRegionClosure { | |
508 bool doHeapRegion(HeapRegion *r) { | |
509 HeapRegionRemSet* hrrs = r->rem_set(); | |
510 hrrs->init_for_par_iteration(); | |
511 return false; | |
512 } | |
513 }; | |
514 | |
1705 | 515 // This closure, applied to a DirtyCardQueueSet, is used to immediately |
516 // update the RSets for the regions in the CSet. For each card it iterates | |
517 // through the oops which coincide with that card. It scans the reference | |
518 // fields in each oop; when it finds an oop that points into the collection | |
519 // set, the RSet for the region containing the referenced object is updated. | |
520 class UpdateRSetCardTableEntryIntoCSetClosure: public CardTableEntryClosure { | |
616
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521 G1CollectedHeap* _g1; |
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522 CardTableModRefBS* _ct_bs; |
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523 public: |
1705 | 524 UpdateRSetCardTableEntryIntoCSetClosure(G1CollectedHeap* g1, |
525 CardTableModRefBS* bs): | |
526 _g1(g1), _ct_bs(bs) | |
527 { } | |
528 | |
529 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
530 // Construct the region representing the card. | |
531 HeapWord* start = _ct_bs->addr_for(card_ptr); | |
532 // And find the region containing it. | |
533 HeapRegion* r = _g1->heap_region_containing(start); | |
534 assert(r != NULL, "unexpected null"); | |
535 | |
536 // Scan oops in the card looking for references into the collection set | |
537 HeapWord* end = _ct_bs->addr_for(card_ptr + 1); | |
538 MemRegion scanRegion(start, end); | |
539 | |
540 UpdateRSetImmediate update_rs_cl(_g1->g1_rem_set()); | |
541 FilterIntoCSClosure update_rs_cset_oop_cl(NULL, _g1, &update_rs_cl); | |
542 FilterOutOfRegionClosure filter_then_update_rs_cset_oop_cl(r, &update_rs_cset_oop_cl); | |
543 | |
544 // We can pass false as the "filter_young" parameter here as: | |
545 // * we should be in a STW pause, | |
546 // * the DCQS to which this closure is applied is used to hold | |
547 // references that point into the collection set from the prior | |
548 // RSet updating, | |
549 // * the post-write barrier shouldn't be logging updates to young | |
550 // regions (but there is a situation where this can happen - see | |
1861 | 551 // the comment in G1RemSet::concurrentRefineOneCard below - |
1705 | 552 // that should not be applicable here), and |
553 // * during actual RSet updating, the filtering of cards in young | |
554 // regions in HeapRegion::oops_on_card_seq_iterate_careful is | |
555 // employed. | |
556 // As a result, when this closure is applied to "refs into cset" | |
557 // DCQS, we shouldn't see any cards in young regions. | |
558 update_rs_cl.set_region(r); | |
559 HeapWord* stop_point = | |
560 r->oops_on_card_seq_iterate_careful(scanRegion, | |
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561 &filter_then_update_rs_cset_oop_cl, |
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562 false /* filter_young */, |
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563 NULL /* card_ptr */); |
1705 | 564 |
565 // Since this is performed in the event of an evacuation failure, we | |
566 // we shouldn't see a non-null stop point | |
567 assert(stop_point == NULL, "saw an unallocated region"); | |
568 return true; | |
616
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569 } |
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570 }; |
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571 |
1861 | 572 void G1RemSet::cleanup_after_oops_into_collection_set_do() { |
342 | 573 guarantee( _cards_scanned != NULL, "invariant" ); |
574 _total_cards_scanned = 0; | |
575 for (uint i = 0; i < n_workers(); ++i) | |
576 _total_cards_scanned += _cards_scanned[i]; | |
577 FREE_C_HEAP_ARRAY(size_t, _cards_scanned); | |
578 _cards_scanned = NULL; | |
579 // Cleanup after copy | |
580 #if G1_REM_SET_LOGGING | |
581 PrintRSClosure cl; | |
582 _g1->heap_region_iterate(&cl); | |
583 #endif | |
584 _g1->set_refine_cte_cl_concurrency(true); | |
585 cleanUpIteratorsClosure iterClosure; | |
586 _g1->collection_set_iterate(&iterClosure); | |
587 // Set all cards back to clean. | |
588 _g1->cleanUpCardTable(); | |
794 | 589 |
1705 | 590 DirtyCardQueueSet& into_cset_dcqs = _g1->into_cset_dirty_card_queue_set(); |
591 int into_cset_n_buffers = into_cset_dcqs.completed_buffers_num(); | |
592 | |
616
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593 if (_g1->evacuation_failed()) { |
1705 | 594 // Restore remembered sets for the regions pointing into the collection set. |
595 | |
616
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596 if (G1DeferredRSUpdate) { |
1705 | 597 // If deferred RS updates are enabled then we just need to transfer |
598 // the completed buffers from (a) the DirtyCardQueueSet used to hold | |
599 // cards that contain references that point into the collection set | |
600 // to (b) the DCQS used to hold the deferred RS updates | |
601 _g1->dirty_card_queue_set().merge_bufferlists(&into_cset_dcqs); | |
616
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602 } else { |
1705 | 603 |
604 CardTableModRefBS* bs = (CardTableModRefBS*)_g1->barrier_set(); | |
605 UpdateRSetCardTableEntryIntoCSetClosure update_rs_cset_immediate(_g1, bs); | |
606 | |
607 int n_completed_buffers = 0; | |
608 while (into_cset_dcqs.apply_closure_to_completed_buffer(&update_rs_cset_immediate, | |
609 0, 0, true)) { | |
610 n_completed_buffers++; | |
611 } | |
612 assert(n_completed_buffers == into_cset_n_buffers, "missed some buffers"); | |
616
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613 } |
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614 } |
1705 | 615 |
616 // Free any completed buffers in the DirtyCardQueueSet used to hold cards | |
617 // which contain references that point into the collection. | |
618 _g1->into_cset_dirty_card_queue_set().clear(); | |
619 assert(_g1->into_cset_dirty_card_queue_set().completed_buffers_num() == 0, | |
620 "all buffers should be freed"); | |
621 _g1->into_cset_dirty_card_queue_set().clear_n_completed_buffers(); | |
342 | 622 } |
623 | |
624 class ScrubRSClosure: public HeapRegionClosure { | |
625 G1CollectedHeap* _g1h; | |
626 BitMap* _region_bm; | |
627 BitMap* _card_bm; | |
628 CardTableModRefBS* _ctbs; | |
629 public: | |
630 ScrubRSClosure(BitMap* region_bm, BitMap* card_bm) : | |
631 _g1h(G1CollectedHeap::heap()), | |
632 _region_bm(region_bm), _card_bm(card_bm), | |
633 _ctbs(NULL) | |
634 { | |
635 ModRefBarrierSet* bs = _g1h->mr_bs(); | |
636 guarantee(bs->is_a(BarrierSet::CardTableModRef), "Precondition"); | |
637 _ctbs = (CardTableModRefBS*)bs; | |
638 } | |
639 | |
640 bool doHeapRegion(HeapRegion* r) { | |
641 if (!r->continuesHumongous()) { | |
642 r->rem_set()->scrub(_ctbs, _region_bm, _card_bm); | |
643 } | |
644 return false; | |
645 } | |
646 }; | |
647 | |
1861 | 648 void G1RemSet::scrub(BitMap* region_bm, BitMap* card_bm) { |
342 | 649 ScrubRSClosure scrub_cl(region_bm, card_bm); |
650 _g1->heap_region_iterate(&scrub_cl); | |
651 } | |
652 | |
1861 | 653 void G1RemSet::scrub_par(BitMap* region_bm, BitMap* card_bm, |
342 | 654 int worker_num, int claim_val) { |
655 ScrubRSClosure scrub_cl(region_bm, card_bm); | |
656 _g1->heap_region_par_iterate_chunked(&scrub_cl, worker_num, claim_val); | |
657 } | |
658 | |
659 | |
660 static IntHistogram out_of_histo(50, 50); | |
661 | |
1705 | 662 class TriggerClosure : public OopClosure { |
663 bool _trigger; | |
664 public: | |
665 TriggerClosure() : _trigger(false) { } | |
666 bool value() const { return _trigger; } | |
667 template <class T> void do_oop_nv(T* p) { _trigger = true; } | |
668 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
669 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
670 }; | |
671 | |
672 class InvokeIfNotTriggeredClosure: public OopClosure { | |
673 TriggerClosure* _t; | |
674 OopClosure* _oc; | |
675 public: | |
676 InvokeIfNotTriggeredClosure(TriggerClosure* t, OopClosure* oc): | |
677 _t(t), _oc(oc) { } | |
678 template <class T> void do_oop_nv(T* p) { | |
679 if (!_t->value()) _oc->do_oop(p); | |
680 } | |
681 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
682 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
683 }; | |
684 | |
685 class Mux2Closure : public OopClosure { | |
686 OopClosure* _c1; | |
687 OopClosure* _c2; | |
688 public: | |
689 Mux2Closure(OopClosure *c1, OopClosure *c2) : _c1(c1), _c2(c2) { } | |
690 template <class T> void do_oop_nv(T* p) { | |
691 _c1->do_oop(p); _c2->do_oop(p); | |
692 } | |
693 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
694 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
695 }; | |
696 | |
1861 | 697 bool G1RemSet::concurrentRefineOneCard_impl(jbyte* card_ptr, int worker_i, |
1705 | 698 bool check_for_refs_into_cset) { |
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699 // Construct the region representing the card. |
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700 HeapWord* start = _ct_bs->addr_for(card_ptr); |
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701 // And find the region containing it. |
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702 HeapRegion* r = _g1->heap_region_containing(start); |
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703 assert(r != NULL, "unexpected null"); |
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704 |
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705 HeapWord* end = _ct_bs->addr_for(card_ptr + 1); |
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706 MemRegion dirtyRegion(start, end); |
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707 |
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708 #if CARD_REPEAT_HISTO |
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709 init_ct_freq_table(_g1->max_capacity()); |
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710 ct_freq_note_card(_ct_bs->index_for(start)); |
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711 #endif |
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|
712 |
1960
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johnc
parents:
1861
diff
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|
713 assert(!check_for_refs_into_cset || _cset_rs_update_cl[worker_i] != NULL, "sanity"); |
878b57474103
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johnc
parents:
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|
714 UpdateRSOrPushRefOopClosure update_rs_oop_cl(_g1, |
878b57474103
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johnc
parents:
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diff
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|
715 _g1->g1_rem_set(), |
878b57474103
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parents:
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|
716 _cset_rs_update_cl[worker_i], |
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parents:
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|
717 check_for_refs_into_cset, |
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|
718 worker_i); |
890
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719 update_rs_oop_cl.set_from(r); |
1705 | 720 |
721 TriggerClosure trigger_cl; | |
722 FilterIntoCSClosure into_cs_cl(NULL, _g1, &trigger_cl); | |
723 InvokeIfNotTriggeredClosure invoke_cl(&trigger_cl, &into_cs_cl); | |
724 Mux2Closure mux(&invoke_cl, &update_rs_oop_cl); | |
725 | |
726 FilterOutOfRegionClosure filter_then_update_rs_oop_cl(r, | |
727 (check_for_refs_into_cset ? | |
728 (OopClosure*)&mux : | |
729 (OopClosure*)&update_rs_oop_cl)); | |
890
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730 |
1666
5cbac8938c4c
6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents:
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diff
changeset
|
731 // The region for the current card may be a young region. The |
5cbac8938c4c
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johnc
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|
732 // current card may have been a card that was evicted from the |
5cbac8938c4c
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johnc
parents:
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|
733 // card cache. When the card was inserted into the cache, we had |
5cbac8938c4c
6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
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734 // determined that its region was non-young. While in the cache, |
5cbac8938c4c
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johnc
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735 // the region may have been freed during a cleanup pause, reallocated |
5cbac8938c4c
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johnc
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|
736 // and tagged as young. |
5cbac8938c4c
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johnc
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737 // |
5cbac8938c4c
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johnc
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738 // We wish to filter out cards for such a region but the current |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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|
739 // thread, if we're running concurrently, may "see" the young type |
1666
5cbac8938c4c
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johnc
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740 // change at any time (so an earlier "is_young" check may pass or |
5cbac8938c4c
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johnc
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|
741 // fail arbitrarily). We tell the iteration code to perform this |
5cbac8938c4c
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johnc
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742 // filtering when it has been determined that there has been an actual |
5cbac8938c4c
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743 // allocation in this region and making it safe to check the young type. |
5cbac8938c4c
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johnc
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|
744 bool filter_young = true; |
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johnc
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|
745 |
890
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|
746 HeapWord* stop_point = |
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|
747 r->oops_on_card_seq_iterate_careful(dirtyRegion, |
1666
5cbac8938c4c
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johnc
parents:
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|
748 &filter_then_update_rs_oop_cl, |
3317
063382f9b575
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
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|
749 filter_young, |
063382f9b575
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tonyp
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|
750 card_ptr); |
1666
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|
751 |
890
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6819077: G1: first GC thread coming late into the GC.
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|
752 // If stop_point is non-null, then we encountered an unallocated region |
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|
753 // (perhaps the unfilled portion of a TLAB.) For now, we'll dirty the |
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|
754 // card and re-enqueue: if we put off the card until a GC pause, then the |
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6819077: G1: first GC thread coming late into the GC.
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|
755 // unallocated portion will be filled in. Alternatively, we might try |
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|
756 // the full complexity of the technique used in "regular" precleaning. |
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6819077: G1: first GC thread coming late into the GC.
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|
757 if (stop_point != NULL) { |
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|
758 // The card might have gotten re-dirtied and re-enqueued while we |
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6819077: G1: first GC thread coming late into the GC.
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|
759 // worked. (In fact, it's pretty likely.) |
6cb8e9df7174
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|
760 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
6cb8e9df7174
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|
761 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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|
762 MutexLockerEx x(Shared_DirtyCardQ_lock, |
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|
763 Mutex::_no_safepoint_check_flag); |
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|
764 DirtyCardQueue* sdcq = |
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|
765 JavaThread::dirty_card_queue_set().shared_dirty_card_queue(); |
6cb8e9df7174
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|
766 sdcq->enqueue(card_ptr); |
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|
767 } |
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|
768 } else { |
6cb8e9df7174
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|
769 out_of_histo.add_entry(filter_then_update_rs_oop_cl.out_of_region()); |
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|
770 _conc_refine_cards++; |
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|
771 } |
1705 | 772 |
773 return trigger_cl.value(); | |
890
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|
774 } |
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|
775 |
1861 | 776 bool G1RemSet::concurrentRefineOneCard(jbyte* card_ptr, int worker_i, |
1705 | 777 bool check_for_refs_into_cset) { |
342 | 778 // If the card is no longer dirty, nothing to do. |
1705 | 779 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
780 // No need to return that this card contains refs that point | |
781 // into the collection set. | |
782 return false; | |
783 } | |
342 | 784 |
785 // Construct the region representing the card. | |
786 HeapWord* start = _ct_bs->addr_for(card_ptr); | |
787 // And find the region containing it. | |
788 HeapRegion* r = _g1->heap_region_containing(start); | |
789 if (r == NULL) { | |
790 guarantee(_g1->is_in_permanent(start), "Or else where?"); | |
1705 | 791 // Again no need to return that this card contains refs that |
792 // point into the collection set. | |
793 return false; // Not in the G1 heap (might be in perm, for example.) | |
342 | 794 } |
795 // Why do we have to check here whether a card is on a young region, | |
796 // given that we dirty young regions and, as a result, the | |
797 // post-barrier is supposed to filter them out and never to enqueue | |
798 // them? When we allocate a new region as the "allocation region" we | |
799 // actually dirty its cards after we release the lock, since card | |
800 // dirtying while holding the lock was a performance bottleneck. So, | |
801 // as a result, it is possible for other threads to actually | |
802 // allocate objects in the region (after the acquire the lock) | |
803 // before all the cards on the region are dirtied. This is unlikely, | |
804 // and it doesn't happen often, but it can happen. So, the extra | |
805 // check below filters out those cards. | |
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
626
diff
changeset
|
806 if (r->is_young()) { |
1705 | 807 return false; |
342 | 808 } |
809 // While we are processing RSet buffers during the collection, we | |
810 // actually don't want to scan any cards on the collection set, | |
811 // since we don't want to update remebered sets with entries that | |
812 // point into the collection set, given that live objects from the | |
813 // collection set are about to move and such entries will be stale | |
814 // very soon. This change also deals with a reliability issue which | |
815 // involves scanning a card in the collection set and coming across | |
816 // an array that was being chunked and looking malformed. Note, | |
817 // however, that if evacuation fails, we have to scan any objects | |
818 // that were not moved and create any missing entries. | |
819 if (r->in_collection_set()) { | |
1705 | 820 return false; |
342 | 821 } |
822 | |
890
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
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|
823 // Should we defer processing the card? |
6cb8e9df7174
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|
824 // |
6cb8e9df7174
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|
825 // Previously the result from the insert_cache call would be |
6cb8e9df7174
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diff
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|
826 // either card_ptr (implying that card_ptr was currently "cold"), |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
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parents:
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diff
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|
827 // null (meaning we had inserted the card ptr into the "hot" |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
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diff
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|
828 // cache, which had some headroom), or a "hot" card ptr |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
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diff
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|
829 // extracted from the "hot" cache. |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
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diff
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|
830 // |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
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parents:
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diff
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|
831 // Now that the _card_counts cache in the ConcurrentG1Refine |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
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parents:
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|
832 // instance is an evicting hash table, the result we get back |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
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parents:
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diff
changeset
|
833 // could be from evicting the card ptr in an already occupied |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
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parents:
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diff
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|
834 // bucket (in which case we have replaced the card ptr in the |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
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|
835 // bucket with card_ptr and "defer" is set to false). To avoid |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
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diff
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|
836 // having a data structure (updates to which would need a lock) |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
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|
837 // to hold these unprocessed dirty cards, we need to immediately |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
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diff
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|
838 // process card_ptr. The actions needed to be taken on return |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
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parents:
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diff
changeset
|
839 // from cache_insert are summarized in the following table: |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
840 // |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
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parents:
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diff
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|
841 // res defer action |
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diff
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|
842 // -------------------------------------------------------------- |
6cb8e9df7174
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diff
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|
843 // null false card evicted from _card_counts & replaced with |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
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parents:
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diff
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|
844 // card_ptr; evicted ptr added to hot cache. |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
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parents:
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diff
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|
845 // No need to process res; immediately process card_ptr |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
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diff
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|
846 // |
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|
847 // null true card not evicted from _card_counts; card_ptr added |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
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diff
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|
848 // to hot cache. |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
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diff
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|
849 // Nothing to do. |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
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diff
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|
850 // |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
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diff
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|
851 // non-null false card evicted from _card_counts & replaced with |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
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|
852 // card_ptr; evicted ptr is currently "cold" or |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
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parents:
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diff
changeset
|
853 // caused an eviction from the hot cache. |
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6819077: G1: first GC thread coming late into the GC.
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parents:
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diff
changeset
|
854 // Immediately process res; process card_ptr. |
6cb8e9df7174
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parents:
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diff
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|
855 // |
6cb8e9df7174
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diff
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|
856 // non-null true card not evicted from _card_counts; card_ptr is |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
857 // currently cold, or caused an eviction from hot |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
changeset
|
858 // cache. |
6cb8e9df7174
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diff
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|
859 // Immediately process res; no need to process card_ptr. |
342 | 860 |
1705 | 861 |
890
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
johnc
parents:
845
diff
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|
862 jbyte* res = card_ptr; |
6cb8e9df7174
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parents:
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diff
changeset
|
863 bool defer = false; |
1705 | 864 |
865 // This gets set to true if the card being refined has references | |
866 // that point into the collection set. | |
867 bool oops_into_cset = false; | |
868 | |
890
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
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parents:
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diff
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|
869 if (_cg1r->use_cache()) { |
6cb8e9df7174
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diff
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|
870 jbyte* res = _cg1r->cache_insert(card_ptr, &defer); |
6cb8e9df7174
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diff
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|
871 if (res != NULL && (res != card_ptr || defer)) { |
6cb8e9df7174
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diff
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|
872 start = _ct_bs->addr_for(res); |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
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|
873 r = _g1->heap_region_containing(start); |
6cb8e9df7174
6819077: G1: first GC thread coming late into the GC.
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parents:
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|
874 if (r == NULL) { |
6cb8e9df7174
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|
875 assert(_g1->is_in_permanent(start), "Or else where?"); |
6cb8e9df7174
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diff
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|
876 } else { |
1666
5cbac8938c4c
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877 // Checking whether the region we got back from the cache |
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878 // is young here is inappropriate. The region could have been |
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879 // freed, reallocated and tagged as young while in the cache. |
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880 // Hence we could see its young type change at any time. |
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881 // |
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882 // Process card pointer we get back from the hot card cache. This |
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883 // will check whether the region containing the card is young |
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884 // _after_ checking that the region has been allocated from. |
1705 | 885 oops_into_cset = concurrentRefineOneCard_impl(res, worker_i, |
886 false /* check_for_refs_into_cset */); | |
887 // The above call to concurrentRefineOneCard_impl is only | |
888 // performed if the hot card cache is enabled. This cache is | |
889 // disabled during an evacuation pause - which is the only | |
890 // time when we need know if the card contains references | |
891 // that point into the collection set. Also when the hot card | |
892 // cache is enabled, this code is executed by the concurrent | |
893 // refine threads - rather than the GC worker threads - and | |
894 // concurrentRefineOneCard_impl will return false. | |
895 assert(!oops_into_cset, "should not see true here"); | |
890
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896 } |
342 | 897 } |
898 } | |
899 | |
890
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900 if (!defer) { |
1705 | 901 oops_into_cset = |
902 concurrentRefineOneCard_impl(card_ptr, worker_i, check_for_refs_into_cset); | |
903 // We should only be detecting that the card contains references | |
904 // that point into the collection set if the current thread is | |
905 // a GC worker thread. | |
906 assert(!oops_into_cset || SafepointSynchronize::is_at_safepoint(), | |
907 "invalid result at non safepoint"); | |
342 | 908 } |
1705 | 909 return oops_into_cset; |
342 | 910 } |
911 | |
912 class HRRSStatsIter: public HeapRegionClosure { | |
913 size_t _occupied; | |
914 size_t _total_mem_sz; | |
915 size_t _max_mem_sz; | |
916 HeapRegion* _max_mem_sz_region; | |
917 public: | |
918 HRRSStatsIter() : | |
919 _occupied(0), | |
920 _total_mem_sz(0), | |
921 _max_mem_sz(0), | |
922 _max_mem_sz_region(NULL) | |
923 {} | |
924 | |
925 bool doHeapRegion(HeapRegion* r) { | |
926 if (r->continuesHumongous()) return false; | |
927 size_t mem_sz = r->rem_set()->mem_size(); | |
928 if (mem_sz > _max_mem_sz) { | |
929 _max_mem_sz = mem_sz; | |
930 _max_mem_sz_region = r; | |
931 } | |
932 _total_mem_sz += mem_sz; | |
933 size_t occ = r->rem_set()->occupied(); | |
934 _occupied += occ; | |
935 return false; | |
936 } | |
937 size_t total_mem_sz() { return _total_mem_sz; } | |
938 size_t max_mem_sz() { return _max_mem_sz; } | |
939 size_t occupied() { return _occupied; } | |
940 HeapRegion* max_mem_sz_region() { return _max_mem_sz_region; } | |
941 }; | |
942 | |
794 | 943 class PrintRSThreadVTimeClosure : public ThreadClosure { |
944 public: | |
945 virtual void do_thread(Thread *t) { | |
946 ConcurrentG1RefineThread* crt = (ConcurrentG1RefineThread*) t; | |
947 gclog_or_tty->print(" %5.2f", crt->vtime_accum()); | |
948 } | |
949 }; | |
950 | |
1861 | 951 void G1RemSet::print_summary_info() { |
342 | 952 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
953 | |
954 #if CARD_REPEAT_HISTO | |
955 gclog_or_tty->print_cr("\nG1 card_repeat count histogram: "); | |
956 gclog_or_tty->print_cr(" # of repeats --> # of cards with that number."); | |
957 card_repeat_count.print_on(gclog_or_tty); | |
958 #endif | |
959 | |
960 if (FILTEROUTOFREGIONCLOSURE_DOHISTOGRAMCOUNT) { | |
961 gclog_or_tty->print_cr("\nG1 rem-set out-of-region histogram: "); | |
962 gclog_or_tty->print_cr(" # of CS ptrs --> # of cards with that number."); | |
963 out_of_histo.print_on(gclog_or_tty); | |
964 } | |
794 | 965 gclog_or_tty->print_cr("\n Concurrent RS processed %d cards", |
966 _conc_refine_cards); | |
342 | 967 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
968 jint tot_processed_buffers = | |
969 dcqs.processed_buffers_mut() + dcqs.processed_buffers_rs_thread(); | |
970 gclog_or_tty->print_cr(" Of %d completed buffers:", tot_processed_buffers); | |
794 | 971 gclog_or_tty->print_cr(" %8d (%5.1f%%) by conc RS threads.", |
342 | 972 dcqs.processed_buffers_rs_thread(), |
973 100.0*(float)dcqs.processed_buffers_rs_thread()/ | |
974 (float)tot_processed_buffers); | |
975 gclog_or_tty->print_cr(" %8d (%5.1f%%) by mutator threads.", | |
976 dcqs.processed_buffers_mut(), | |
977 100.0*(float)dcqs.processed_buffers_mut()/ | |
978 (float)tot_processed_buffers); | |
794 | 979 gclog_or_tty->print_cr(" Conc RS threads times(s)"); |
980 PrintRSThreadVTimeClosure p; | |
981 gclog_or_tty->print(" "); | |
982 g1->concurrent_g1_refine()->threads_do(&p); | |
342 | 983 gclog_or_tty->print_cr(""); |
794 | 984 |
1861 | 985 HRRSStatsIter blk; |
986 g1->heap_region_iterate(&blk); | |
987 gclog_or_tty->print_cr(" Total heap region rem set sizes = " SIZE_FORMAT "K." | |
988 " Max = " SIZE_FORMAT "K.", | |
989 blk.total_mem_sz()/K, blk.max_mem_sz()/K); | |
990 gclog_or_tty->print_cr(" Static structures = " SIZE_FORMAT "K," | |
991 " free_lists = " SIZE_FORMAT "K.", | |
992 HeapRegionRemSet::static_mem_size()/K, | |
993 HeapRegionRemSet::fl_mem_size()/K); | |
994 gclog_or_tty->print_cr(" %d occupied cards represented.", | |
995 blk.occupied()); | |
996 gclog_or_tty->print_cr(" Max sz region = [" PTR_FORMAT ", " PTR_FORMAT " )" | |
997 ", cap = " SIZE_FORMAT "K, occ = " SIZE_FORMAT "K.", | |
998 blk.max_mem_sz_region()->bottom(), blk.max_mem_sz_region()->end(), | |
999 (blk.max_mem_sz_region()->rem_set()->mem_size() + K - 1)/K, | |
1000 (blk.max_mem_sz_region()->rem_set()->occupied() + K - 1)/K); | |
1001 gclog_or_tty->print_cr(" Did %d coarsenings.", HeapRegionRemSet::n_coarsenings()); | |
342 | 1002 } |
1705 | 1003 |
1861 | 1004 void G1RemSet::prepare_for_verify() { |
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1005 if (G1HRRSFlushLogBuffersOnVerify && |
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1006 (VerifyBeforeGC || VerifyAfterGC) |
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1007 && !_g1->full_collection()) { |
342 | 1008 cleanupHRRS(); |
1009 _g1->set_refine_cte_cl_concurrency(false); | |
1010 if (SafepointSynchronize::is_at_safepoint()) { | |
1011 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1012 dcqs.concatenate_logs(); | |
1013 } | |
1014 bool cg1r_use_cache = _cg1r->use_cache(); | |
1015 _cg1r->set_use_cache(false); | |
1705 | 1016 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); |
1017 updateRS(&into_cset_dcq, 0); | |
1018 _g1->into_cset_dirty_card_queue_set().clear(); | |
342 | 1019 _cg1r->set_use_cache(cg1r_use_cache); |
637
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1020 |
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1021 assert(JavaThread::dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
342 | 1022 } |
1023 } |