Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1RemSet.cpp @ 4095:bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
Summary: Select number of GC threads dynamically based on heap usage and number of Java threads
Reviewed-by: johnc, ysr, jcoomes
author | jmasa |
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date | Tue, 09 Aug 2011 10:16:01 -0700 |
parents | a88de71c4e3a |
children | dc467e8b2c5e |
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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 | |
1861 | 69 G1RemSet::G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs) |
70 : _g1(g1), _conc_refine_cards(0), | |
71 _ct_bs(ct_bs), _g1p(_g1->g1_policy()), | |
342 | 72 _cg1r(g1->concurrent_g1_refine()), |
1705 | 73 _cset_rs_update_cl(NULL), |
342 | 74 _cards_scanned(NULL), _total_cards_scanned(0) |
75 { | |
76 _seq_task = new SubTasksDone(NumSeqTasks); | |
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77 guarantee(n_workers() > 0, "There should be some workers"); |
1705 | 78 _cset_rs_update_cl = NEW_C_HEAP_ARRAY(OopsInHeapRegionClosure*, n_workers()); |
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79 for (uint i = 0; i < n_workers(); i++) { |
1705 | 80 _cset_rs_update_cl[i] = NULL; |
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81 } |
342 | 82 } |
83 | |
1861 | 84 G1RemSet::~G1RemSet() { |
342 | 85 delete _seq_task; |
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86 for (uint i = 0; i < n_workers(); i++) { |
1705 | 87 assert(_cset_rs_update_cl[i] == NULL, "it should be"); |
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88 } |
1705 | 89 FREE_C_HEAP_ARRAY(OopsInHeapRegionClosure*, _cset_rs_update_cl); |
342 | 90 } |
91 | |
92 void CountNonCleanMemRegionClosure::do_MemRegion(MemRegion mr) { | |
93 if (_g1->is_in_g1_reserved(mr.start())) { | |
94 _n += (int) ((mr.byte_size() / CardTableModRefBS::card_size)); | |
95 if (_start_first == NULL) _start_first = mr.start(); | |
96 } | |
97 } | |
98 | |
99 class ScanRSClosure : public HeapRegionClosure { | |
100 size_t _cards_done, _cards; | |
101 G1CollectedHeap* _g1h; | |
102 OopsInHeapRegionClosure* _oc; | |
103 G1BlockOffsetSharedArray* _bot_shared; | |
104 CardTableModRefBS *_ct_bs; | |
105 int _worker_i; | |
1261 | 106 int _block_size; |
342 | 107 bool _try_claimed; |
108 public: | |
109 ScanRSClosure(OopsInHeapRegionClosure* oc, int worker_i) : | |
110 _oc(oc), | |
111 _cards(0), | |
112 _cards_done(0), | |
113 _worker_i(worker_i), | |
114 _try_claimed(false) | |
115 { | |
116 _g1h = G1CollectedHeap::heap(); | |
117 _bot_shared = _g1h->bot_shared(); | |
118 _ct_bs = (CardTableModRefBS*) (_g1h->barrier_set()); | |
1261 | 119 _block_size = MAX2<int>(G1RSetScanBlockSize, 1); |
342 | 120 } |
121 | |
122 void set_try_claimed() { _try_claimed = true; } | |
123 | |
124 void scanCard(size_t index, HeapRegion *r) { | |
4023 | 125 // Stack allocate the DirtyCardToOopClosure instance |
126 HeapRegionDCTOC cl(_g1h, r, _oc, | |
127 CardTableModRefBS::Precise, | |
128 HeapRegionDCTOC::IntoCSFilterKind); | |
342 | 129 |
130 // Set the "from" region in the closure. | |
131 _oc->set_region(r); | |
132 HeapWord* card_start = _bot_shared->address_for_index(index); | |
133 HeapWord* card_end = card_start + G1BlockOffsetSharedArray::N_words; | |
134 Space *sp = SharedHeap::heap()->space_containing(card_start); | |
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135 MemRegion sm_region = sp->used_region_at_save_marks(); |
342 | 136 MemRegion mr = sm_region.intersection(MemRegion(card_start,card_end)); |
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137 if (!mr.is_empty() && !_ct_bs->is_card_claimed(index)) { |
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138 // We make the card as "claimed" lazily (so races are possible |
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139 // but they're benign), which reduces the number of duplicate |
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140 // scans (the rsets of the regions in the cset can intersect). |
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141 _ct_bs->set_card_claimed(index); |
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142 _cards_done++; |
4023 | 143 cl.do_MemRegion(mr); |
342 | 144 } |
145 } | |
146 | |
147 void printCard(HeapRegion* card_region, size_t card_index, | |
148 HeapWord* card_start) { | |
149 gclog_or_tty->print_cr("T %d Region [" PTR_FORMAT ", " PTR_FORMAT ") " | |
150 "RS names card %p: " | |
151 "[" PTR_FORMAT ", " PTR_FORMAT ")", | |
152 _worker_i, | |
153 card_region->bottom(), card_region->end(), | |
154 card_index, | |
155 card_start, card_start + G1BlockOffsetSharedArray::N_words); | |
156 } | |
157 | |
158 bool doHeapRegion(HeapRegion* r) { | |
159 assert(r->in_collection_set(), "should only be called on elements of CS."); | |
160 HeapRegionRemSet* hrrs = r->rem_set(); | |
161 if (hrrs->iter_is_complete()) return false; // All done. | |
162 if (!_try_claimed && !hrrs->claim_iter()) return false; | |
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163 // If we ever free the collection set concurrently, we should also |
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164 // clear the card table concurrently therefore we won't need to |
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165 // add regions of the collection set to the dirty cards region. |
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166 _g1h->push_dirty_cards_region(r); |
342 | 167 // If we didn't return above, then |
168 // _try_claimed || r->claim_iter() | |
169 // is true: either we're supposed to work on claimed-but-not-complete | |
170 // regions, or we successfully claimed the region. | |
171 HeapRegionRemSetIterator* iter = _g1h->rem_set_iterator(_worker_i); | |
172 hrrs->init_iterator(iter); | |
173 size_t card_index; | |
1261 | 174 |
175 // We claim cards in block so as to recude the contention. The block size is determined by | |
176 // the G1RSetScanBlockSize parameter. | |
177 size_t jump_to_card = hrrs->iter_claimed_next(_block_size); | |
178 for (size_t current_card = 0; iter->has_next(card_index); current_card++) { | |
179 if (current_card >= jump_to_card + _block_size) { | |
180 jump_to_card = hrrs->iter_claimed_next(_block_size); | |
747 | 181 } |
1261 | 182 if (current_card < jump_to_card) continue; |
342 | 183 HeapWord* card_start = _g1h->bot_shared()->address_for_index(card_index); |
184 #if 0 | |
185 gclog_or_tty->print("Rem set iteration yielded card [" PTR_FORMAT ", " PTR_FORMAT ").\n", | |
186 card_start, card_start + CardTableModRefBS::card_size_in_words); | |
187 #endif | |
188 | |
189 HeapRegion* card_region = _g1h->heap_region_containing(card_start); | |
190 assert(card_region != NULL, "Yielding cards not in the heap?"); | |
191 _cards++; | |
192 | |
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193 if (!card_region->is_on_dirty_cards_region_list()) { |
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194 _g1h->push_dirty_cards_region(card_region); |
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195 } |
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196 |
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197 // If the card is dirty, then we will scan it during updateRS. |
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198 if (!card_region->in_collection_set() && |
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199 !_ct_bs->is_card_dirty(card_index)) { |
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200 scanCard(card_index, card_region); |
342 | 201 } |
202 } | |
747 | 203 if (!_try_claimed) { |
204 hrrs->set_iter_complete(); | |
205 } | |
342 | 206 return false; |
207 } | |
208 size_t cards_done() { return _cards_done;} | |
209 size_t cards_looked_up() { return _cards;} | |
210 }; | |
211 | |
212 // We want the parallel threads to start their scanning at | |
213 // different collection set regions to avoid contention. | |
214 // If we have: | |
215 // n collection set regions | |
216 // p threads | |
217 // Then thread t will start at region t * floor (n/p) | |
218 | |
1861 | 219 HeapRegion* G1RemSet::calculateStartRegion(int worker_i) { |
342 | 220 HeapRegion* result = _g1p->collection_set(); |
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221 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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222 size_t cs_size = _g1p->cset_region_length(); |
342 | 223 int n_workers = _g1->workers()->total_workers(); |
224 size_t cs_spans = cs_size / n_workers; | |
225 size_t ind = cs_spans * worker_i; | |
226 for (size_t i = 0; i < ind; i++) | |
227 result = result->next_in_collection_set(); | |
228 } | |
229 return result; | |
230 } | |
231 | |
1861 | 232 void G1RemSet::scanRS(OopsInHeapRegionClosure* oc, int worker_i) { |
342 | 233 double rs_time_start = os::elapsedTime(); |
234 HeapRegion *startRegion = calculateStartRegion(worker_i); | |
235 | |
1261 | 236 ScanRSClosure scanRScl(oc, worker_i); |
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237 |
342 | 238 _g1->collection_set_iterate_from(startRegion, &scanRScl); |
239 scanRScl.set_try_claimed(); | |
240 _g1->collection_set_iterate_from(startRegion, &scanRScl); | |
241 | |
1261 | 242 double scan_rs_time_sec = os::elapsedTime() - rs_time_start; |
342 | 243 |
244 assert( _cards_scanned != NULL, "invariant" ); | |
245 _cards_scanned[worker_i] = scanRScl.cards_done(); | |
246 | |
247 _g1p->record_scan_rs_time(worker_i, scan_rs_time_sec * 1000.0); | |
248 } | |
249 | |
1705 | 250 // Closure used for updating RSets and recording references that |
251 // point into the collection set. Only called during an | |
252 // evacuation pause. | |
253 | |
254 class RefineRecordRefsIntoCSCardTableEntryClosure: public CardTableEntryClosure { | |
255 G1RemSet* _g1rs; | |
256 DirtyCardQueue* _into_cset_dcq; | |
257 public: | |
258 RefineRecordRefsIntoCSCardTableEntryClosure(G1CollectedHeap* g1h, | |
259 DirtyCardQueue* into_cset_dcq) : | |
260 _g1rs(g1h->g1_rem_set()), _into_cset_dcq(into_cset_dcq) | |
261 {} | |
262 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
263 // The only time we care about recording cards that | |
264 // contain references that point into the collection set | |
265 // is during RSet updating within an evacuation pause. | |
266 // In this case worker_i should be the id of a GC worker thread. | |
267 assert(SafepointSynchronize::is_at_safepoint(), "not during an evacuation pause"); | |
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268 assert(worker_i < (int) (ParallelGCThreads == 0 ? 1 : ParallelGCThreads), "should be a GC worker"); |
342 | 269 |
1705 | 270 if (_g1rs->concurrentRefineOneCard(card_ptr, worker_i, true)) { |
271 // 'card_ptr' contains references that point into the collection | |
272 // set. We need to record the card in the DCQS | |
273 // (G1CollectedHeap::into_cset_dirty_card_queue_set()) | |
274 // that's used for that purpose. | |
275 // | |
276 // Enqueue the card | |
277 _into_cset_dcq->enqueue(card_ptr); | |
278 } | |
279 return true; | |
280 } | |
281 }; | |
282 | |
1861 | 283 void G1RemSet::updateRS(DirtyCardQueue* into_cset_dcq, int worker_i) { |
342 | 284 double start = os::elapsedTime(); |
1705 | 285 // Apply the given closure to all remaining log entries. |
286 RefineRecordRefsIntoCSCardTableEntryClosure into_cset_update_rs_cl(_g1, into_cset_dcq); | |
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287 |
1705 | 288 _g1->iterate_dirty_card_closure(&into_cset_update_rs_cl, into_cset_dcq, false, worker_i); |
289 | |
794 | 290 // Now there should be no dirty cards. |
291 if (G1RSLogCheckCardTable) { | |
292 CountNonCleanMemRegionClosure cl(_g1); | |
293 _ct_bs->mod_card_iterate(&cl); | |
294 // XXX This isn't true any more: keeping cards of young regions | |
295 // marked dirty broke it. Need some reasonable fix. | |
296 guarantee(cl.n() == 0, "Card table should be clean."); | |
342 | 297 } |
794 | 298 |
342 | 299 _g1p->record_update_rs_time(worker_i, (os::elapsedTime() - start) * 1000.0); |
300 } | |
301 | |
302 class CountRSSizeClosure: public HeapRegionClosure { | |
303 size_t _n; | |
304 size_t _tot; | |
305 size_t _max; | |
306 HeapRegion* _max_r; | |
307 enum { | |
308 N = 20, | |
309 MIN = 6 | |
310 }; | |
311 int _histo[N]; | |
312 public: | |
313 CountRSSizeClosure() : _n(0), _tot(0), _max(0), _max_r(NULL) { | |
314 for (int i = 0; i < N; i++) _histo[i] = 0; | |
315 } | |
316 bool doHeapRegion(HeapRegion* r) { | |
317 if (!r->continuesHumongous()) { | |
318 size_t occ = r->rem_set()->occupied(); | |
319 _n++; | |
320 _tot += occ; | |
321 if (occ > _max) { | |
322 _max = occ; | |
323 _max_r = r; | |
324 } | |
325 // Fit it into a histo bin. | |
326 int s = 1 << MIN; | |
327 int i = 0; | |
328 while (occ > (size_t) s && i < (N-1)) { | |
329 s = s << 1; | |
330 i++; | |
331 } | |
332 _histo[i]++; | |
333 } | |
334 return false; | |
335 } | |
336 size_t n() { return _n; } | |
337 size_t tot() { return _tot; } | |
338 size_t mx() { return _max; } | |
339 HeapRegion* mxr() { return _max_r; } | |
340 void print_histo() { | |
341 int mx = N; | |
342 while (mx >= 0) { | |
343 if (_histo[mx-1] > 0) break; | |
344 mx--; | |
345 } | |
346 gclog_or_tty->print_cr("Number of regions with given RS sizes:"); | |
347 gclog_or_tty->print_cr(" <= %8d %8d", 1 << MIN, _histo[0]); | |
348 for (int i = 1; i < mx-1; i++) { | |
349 gclog_or_tty->print_cr(" %8d - %8d %8d", | |
350 (1 << (MIN + i - 1)) + 1, | |
351 1 << (MIN + i), | |
352 _histo[i]); | |
353 } | |
354 gclog_or_tty->print_cr(" > %8d %8d", (1 << (MIN+mx-2))+1, _histo[mx-1]); | |
355 } | |
356 }; | |
357 | |
1861 | 358 void G1RemSet::cleanupHRRS() { |
342 | 359 HeapRegionRemSet::cleanup(); |
360 } | |
361 | |
1861 | 362 void G1RemSet::oops_into_collection_set_do(OopsInHeapRegionClosure* oc, |
342 | 363 int worker_i) { |
364 #if CARD_REPEAT_HISTO | |
365 ct_freq_update_histo_and_reset(); | |
366 #endif | |
367 if (worker_i == 0) { | |
368 _cg1r->clear_and_record_card_counts(); | |
369 } | |
370 | |
371 // Make this into a command-line flag... | |
372 if (G1RSCountHisto && (ParallelGCThreads == 0 || worker_i == 0)) { | |
373 CountRSSizeClosure count_cl; | |
374 _g1->heap_region_iterate(&count_cl); | |
375 gclog_or_tty->print_cr("Avg of %d RS counts is %f, max is %d, " | |
376 "max region is " PTR_FORMAT, | |
377 count_cl.n(), (float)count_cl.tot()/(float)count_cl.n(), | |
378 count_cl.mx(), count_cl.mxr()); | |
379 count_cl.print_histo(); | |
380 } | |
381 | |
1705 | 382 // We cache the value of 'oc' closure into the appropriate slot in the |
383 // _cset_rs_update_cl for this worker | |
384 assert(worker_i < (int)n_workers(), "sanity"); | |
385 _cset_rs_update_cl[worker_i] = oc; | |
386 | |
387 // A DirtyCardQueue that is used to hold cards containing references | |
388 // that point into the collection set. This DCQ is associated with a | |
389 // special DirtyCardQueueSet (see g1CollectedHeap.hpp). Under normal | |
390 // circumstances (i.e. the pause successfully completes), these cards | |
391 // are just discarded (there's no need to update the RSets of regions | |
392 // that were in the collection set - after the pause these regions | |
393 // are wholly 'free' of live objects. In the event of an evacuation | |
394 // failure the cards/buffers in this queue set are: | |
395 // * passed to the DirtyCardQueueSet that is used to manage deferred | |
396 // RSet updates, or | |
397 // * scanned for references that point into the collection set | |
398 // and the RSet of the corresponding region in the collection set | |
399 // is updated immediately. | |
400 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); | |
401 | |
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402 assert((ParallelGCThreads > 0) || worker_i == 0, "invariant"); |
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403 |
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404 // The two flags below were introduced temporarily to serialize |
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405 // the updating and scanning of remembered sets. There are some |
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406 // race conditions when these two operations are done in parallel |
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407 // and they are causing failures. When we resolve said race |
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408 // conditions, we'll revert back to parallel remembered set |
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409 // updating and scanning. See CRs 6677707 and 6677708. |
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410 if (G1UseParallelRSetUpdating || (worker_i == 0)) { |
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411 updateRS(&into_cset_dcq, worker_i); |
342 | 412 } else { |
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413 _g1p->record_update_rs_processed_buffers(worker_i, 0.0); |
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414 _g1p->record_update_rs_time(worker_i, 0.0); |
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415 } |
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416 if (G1UseParallelRSetScanning || (worker_i == 0)) { |
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417 scanRS(oc, worker_i); |
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418 } else { |
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419 _g1p->record_scan_rs_time(worker_i, 0.0); |
342 | 420 } |
1705 | 421 |
422 // We now clear the cached values of _cset_rs_update_cl for this worker | |
423 _cset_rs_update_cl[worker_i] = NULL; | |
342 | 424 } |
425 | |
1861 | 426 void G1RemSet::prepare_for_oops_into_collection_set_do() { |
342 | 427 cleanupHRRS(); |
428 ConcurrentG1Refine* cg1r = _g1->concurrent_g1_refine(); | |
429 _g1->set_refine_cte_cl_concurrency(false); | |
430 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
431 dcqs.concatenate_logs(); | |
432 | |
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433 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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434 // Don't set the number of workers here. It will be set |
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435 // when the task is run |
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436 // _seq_task->set_n_termination((int)n_workers()); |
342 | 437 } |
438 guarantee( _cards_scanned == NULL, "invariant" ); | |
439 _cards_scanned = NEW_C_HEAP_ARRAY(size_t, n_workers()); | |
545 | 440 for (uint i = 0; i < n_workers(); ++i) { |
441 _cards_scanned[i] = 0; | |
442 } | |
342 | 443 _total_cards_scanned = 0; |
444 } | |
445 | |
446 | |
1705 | 447 // This closure, applied to a DirtyCardQueueSet, is used to immediately |
448 // update the RSets for the regions in the CSet. For each card it iterates | |
449 // through the oops which coincide with that card. It scans the reference | |
450 // fields in each oop; when it finds an oop that points into the collection | |
451 // set, the RSet for the region containing the referenced object is updated. | |
452 class UpdateRSetCardTableEntryIntoCSetClosure: public CardTableEntryClosure { | |
616
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453 G1CollectedHeap* _g1; |
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454 CardTableModRefBS* _ct_bs; |
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455 public: |
1705 | 456 UpdateRSetCardTableEntryIntoCSetClosure(G1CollectedHeap* g1, |
457 CardTableModRefBS* bs): | |
458 _g1(g1), _ct_bs(bs) | |
459 { } | |
460 | |
461 bool do_card_ptr(jbyte* card_ptr, int worker_i) { | |
462 // Construct the region representing the card. | |
463 HeapWord* start = _ct_bs->addr_for(card_ptr); | |
464 // And find the region containing it. | |
465 HeapRegion* r = _g1->heap_region_containing(start); | |
466 assert(r != NULL, "unexpected null"); | |
467 | |
468 // Scan oops in the card looking for references into the collection set | |
469 HeapWord* end = _ct_bs->addr_for(card_ptr + 1); | |
470 MemRegion scanRegion(start, end); | |
471 | |
472 UpdateRSetImmediate update_rs_cl(_g1->g1_rem_set()); | |
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473 FilterIntoCSClosure update_rs_cset_oop_cl(NULL, _g1, &update_rs_cl); |
1705 | 474 FilterOutOfRegionClosure filter_then_update_rs_cset_oop_cl(r, &update_rs_cset_oop_cl); |
475 | |
476 // We can pass false as the "filter_young" parameter here as: | |
477 // * we should be in a STW pause, | |
478 // * the DCQS to which this closure is applied is used to hold | |
479 // references that point into the collection set from the prior | |
480 // RSet updating, | |
481 // * the post-write barrier shouldn't be logging updates to young | |
482 // regions (but there is a situation where this can happen - see | |
1861 | 483 // the comment in G1RemSet::concurrentRefineOneCard below - |
1705 | 484 // that should not be applicable here), and |
485 // * during actual RSet updating, the filtering of cards in young | |
486 // regions in HeapRegion::oops_on_card_seq_iterate_careful is | |
487 // employed. | |
488 // As a result, when this closure is applied to "refs into cset" | |
489 // DCQS, we shouldn't see any cards in young regions. | |
490 update_rs_cl.set_region(r); | |
491 HeapWord* stop_point = | |
492 r->oops_on_card_seq_iterate_careful(scanRegion, | |
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493 &filter_then_update_rs_cset_oop_cl, |
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494 false /* filter_young */, |
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495 NULL /* card_ptr */); |
1705 | 496 |
497 // Since this is performed in the event of an evacuation failure, we | |
498 // we shouldn't see a non-null stop point | |
499 assert(stop_point == NULL, "saw an unallocated region"); | |
500 return true; | |
616
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501 } |
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502 }; |
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503 |
1861 | 504 void G1RemSet::cleanup_after_oops_into_collection_set_do() { |
342 | 505 guarantee( _cards_scanned != NULL, "invariant" ); |
506 _total_cards_scanned = 0; | |
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507 for (uint i = 0; i < n_workers(); ++i) { |
342 | 508 _total_cards_scanned += _cards_scanned[i]; |
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509 } |
342 | 510 FREE_C_HEAP_ARRAY(size_t, _cards_scanned); |
511 _cards_scanned = NULL; | |
512 // Cleanup after copy | |
513 _g1->set_refine_cte_cl_concurrency(true); | |
514 // Set all cards back to clean. | |
515 _g1->cleanUpCardTable(); | |
794 | 516 |
1705 | 517 DirtyCardQueueSet& into_cset_dcqs = _g1->into_cset_dirty_card_queue_set(); |
518 int into_cset_n_buffers = into_cset_dcqs.completed_buffers_num(); | |
519 | |
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520 if (_g1->evacuation_failed()) { |
1705 | 521 // Restore remembered sets for the regions pointing into the collection set. |
522 | |
616
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523 if (G1DeferredRSUpdate) { |
1705 | 524 // If deferred RS updates are enabled then we just need to transfer |
525 // the completed buffers from (a) the DirtyCardQueueSet used to hold | |
526 // cards that contain references that point into the collection set | |
527 // to (b) the DCQS used to hold the deferred RS updates | |
528 _g1->dirty_card_queue_set().merge_bufferlists(&into_cset_dcqs); | |
616
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529 } else { |
1705 | 530 |
531 CardTableModRefBS* bs = (CardTableModRefBS*)_g1->barrier_set(); | |
532 UpdateRSetCardTableEntryIntoCSetClosure update_rs_cset_immediate(_g1, bs); | |
533 | |
534 int n_completed_buffers = 0; | |
535 while (into_cset_dcqs.apply_closure_to_completed_buffer(&update_rs_cset_immediate, | |
536 0, 0, true)) { | |
537 n_completed_buffers++; | |
538 } | |
539 assert(n_completed_buffers == into_cset_n_buffers, "missed some buffers"); | |
616
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540 } |
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541 } |
1705 | 542 |
543 // Free any completed buffers in the DirtyCardQueueSet used to hold cards | |
544 // which contain references that point into the collection. | |
545 _g1->into_cset_dirty_card_queue_set().clear(); | |
546 assert(_g1->into_cset_dirty_card_queue_set().completed_buffers_num() == 0, | |
547 "all buffers should be freed"); | |
548 _g1->into_cset_dirty_card_queue_set().clear_n_completed_buffers(); | |
342 | 549 } |
550 | |
551 class ScrubRSClosure: public HeapRegionClosure { | |
552 G1CollectedHeap* _g1h; | |
553 BitMap* _region_bm; | |
554 BitMap* _card_bm; | |
555 CardTableModRefBS* _ctbs; | |
556 public: | |
557 ScrubRSClosure(BitMap* region_bm, BitMap* card_bm) : | |
558 _g1h(G1CollectedHeap::heap()), | |
559 _region_bm(region_bm), _card_bm(card_bm), | |
560 _ctbs(NULL) | |
561 { | |
562 ModRefBarrierSet* bs = _g1h->mr_bs(); | |
563 guarantee(bs->is_a(BarrierSet::CardTableModRef), "Precondition"); | |
564 _ctbs = (CardTableModRefBS*)bs; | |
565 } | |
566 | |
567 bool doHeapRegion(HeapRegion* r) { | |
568 if (!r->continuesHumongous()) { | |
569 r->rem_set()->scrub(_ctbs, _region_bm, _card_bm); | |
570 } | |
571 return false; | |
572 } | |
573 }; | |
574 | |
1861 | 575 void G1RemSet::scrub(BitMap* region_bm, BitMap* card_bm) { |
342 | 576 ScrubRSClosure scrub_cl(region_bm, card_bm); |
577 _g1->heap_region_iterate(&scrub_cl); | |
578 } | |
579 | |
1861 | 580 void G1RemSet::scrub_par(BitMap* region_bm, BitMap* card_bm, |
342 | 581 int worker_num, int claim_val) { |
582 ScrubRSClosure scrub_cl(region_bm, card_bm); | |
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583 _g1->heap_region_par_iterate_chunked(&scrub_cl, |
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584 worker_num, |
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585 (int) n_workers(), |
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586 claim_val); |
342 | 587 } |
588 | |
589 | |
590 static IntHistogram out_of_histo(50, 50); | |
591 | |
1705 | 592 class TriggerClosure : public OopClosure { |
593 bool _trigger; | |
594 public: | |
595 TriggerClosure() : _trigger(false) { } | |
596 bool value() const { return _trigger; } | |
597 template <class T> void do_oop_nv(T* p) { _trigger = true; } | |
598 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
599 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
600 }; | |
601 | |
602 class InvokeIfNotTriggeredClosure: public OopClosure { | |
603 TriggerClosure* _t; | |
604 OopClosure* _oc; | |
605 public: | |
606 InvokeIfNotTriggeredClosure(TriggerClosure* t, OopClosure* oc): | |
607 _t(t), _oc(oc) { } | |
608 template <class T> void do_oop_nv(T* p) { | |
609 if (!_t->value()) _oc->do_oop(p); | |
610 } | |
611 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
612 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
613 }; | |
614 | |
615 class Mux2Closure : public OopClosure { | |
616 OopClosure* _c1; | |
617 OopClosure* _c2; | |
618 public: | |
619 Mux2Closure(OopClosure *c1, OopClosure *c2) : _c1(c1), _c2(c2) { } | |
620 template <class T> void do_oop_nv(T* p) { | |
621 _c1->do_oop(p); _c2->do_oop(p); | |
622 } | |
623 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
624 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
625 }; | |
626 | |
1861 | 627 bool G1RemSet::concurrentRefineOneCard_impl(jbyte* card_ptr, int worker_i, |
1705 | 628 bool check_for_refs_into_cset) { |
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629 // Construct the region representing the card. |
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630 HeapWord* start = _ct_bs->addr_for(card_ptr); |
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631 // And find the region containing it. |
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632 HeapRegion* r = _g1->heap_region_containing(start); |
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633 assert(r != NULL, "unexpected null"); |
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634 |
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635 HeapWord* end = _ct_bs->addr_for(card_ptr + 1); |
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636 MemRegion dirtyRegion(start, end); |
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637 |
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638 #if CARD_REPEAT_HISTO |
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639 init_ct_freq_table(_g1->max_capacity()); |
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640 ct_freq_note_card(_ct_bs->index_for(start)); |
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641 #endif |
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642 |
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643 OopsInHeapRegionClosure* oops_in_heap_closure = NULL; |
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644 if (check_for_refs_into_cset) { |
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645 // ConcurrentG1RefineThreads have worker numbers larger than what |
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646 // _cset_rs_update_cl[] is set up to handle. But those threads should |
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647 // only be active outside of a collection which means that when they |
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648 // reach here they should have check_for_refs_into_cset == false. |
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649 assert((size_t)worker_i < n_workers(), "index of worker larger than _cset_rs_update_cl[].length"); |
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650 oops_in_heap_closure = _cset_rs_update_cl[worker_i]; |
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651 } |
1960
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652 UpdateRSOrPushRefOopClosure update_rs_oop_cl(_g1, |
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653 _g1->g1_rem_set(), |
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654 oops_in_heap_closure, |
1960
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655 check_for_refs_into_cset, |
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656 worker_i); |
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657 update_rs_oop_cl.set_from(r); |
1705 | 658 |
659 TriggerClosure trigger_cl; | |
3983
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660 FilterIntoCSClosure into_cs_cl(NULL, _g1, &trigger_cl); |
1705 | 661 InvokeIfNotTriggeredClosure invoke_cl(&trigger_cl, &into_cs_cl); |
662 Mux2Closure mux(&invoke_cl, &update_rs_oop_cl); | |
663 | |
664 FilterOutOfRegionClosure filter_then_update_rs_oop_cl(r, | |
665 (check_for_refs_into_cset ? | |
666 (OopClosure*)&mux : | |
667 (OopClosure*)&update_rs_oop_cl)); | |
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668 |
1666
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669 // The region for the current card may be a young region. The |
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670 // current card may have been a card that was evicted from the |
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671 // card cache. When the card was inserted into the cache, we had |
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672 // determined that its region was non-young. While in the cache, |
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673 // the region may have been freed during a cleanup pause, reallocated |
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674 // and tagged as young. |
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675 // |
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676 // We wish to filter out cards for such a region but the current |
3317
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677 // thread, if we're running concurrently, may "see" the young type |
1666
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678 // change at any time (so an earlier "is_young" check may pass or |
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679 // fail arbitrarily). We tell the iteration code to perform this |
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680 // filtering when it has been determined that there has been an actual |
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681 // allocation in this region and making it safe to check the young type. |
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682 bool filter_young = true; |
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683 |
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684 HeapWord* stop_point = |
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685 r->oops_on_card_seq_iterate_careful(dirtyRegion, |
1666
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686 &filter_then_update_rs_oop_cl, |
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687 filter_young, |
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688 card_ptr); |
1666
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689 |
890
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690 // If stop_point is non-null, then we encountered an unallocated region |
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691 // (perhaps the unfilled portion of a TLAB.) For now, we'll dirty the |
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692 // card and re-enqueue: if we put off the card until a GC pause, then the |
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693 // unallocated portion will be filled in. Alternatively, we might try |
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694 // the full complexity of the technique used in "regular" precleaning. |
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695 if (stop_point != NULL) { |
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696 // The card might have gotten re-dirtied and re-enqueued while we |
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697 // worked. (In fact, it's pretty likely.) |
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698 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
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699 *card_ptr = CardTableModRefBS::dirty_card_val(); |
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700 MutexLockerEx x(Shared_DirtyCardQ_lock, |
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701 Mutex::_no_safepoint_check_flag); |
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702 DirtyCardQueue* sdcq = |
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703 JavaThread::dirty_card_queue_set().shared_dirty_card_queue(); |
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704 sdcq->enqueue(card_ptr); |
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705 } |
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706 } else { |
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707 out_of_histo.add_entry(filter_then_update_rs_oop_cl.out_of_region()); |
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708 _conc_refine_cards++; |
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709 } |
1705 | 710 |
711 return trigger_cl.value(); | |
890
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712 } |
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713 |
1861 | 714 bool G1RemSet::concurrentRefineOneCard(jbyte* card_ptr, int worker_i, |
1705 | 715 bool check_for_refs_into_cset) { |
342 | 716 // If the card is no longer dirty, nothing to do. |
1705 | 717 if (*card_ptr != CardTableModRefBS::dirty_card_val()) { |
718 // No need to return that this card contains refs that point | |
719 // into the collection set. | |
720 return false; | |
721 } | |
342 | 722 |
723 // Construct the region representing the card. | |
724 HeapWord* start = _ct_bs->addr_for(card_ptr); | |
725 // And find the region containing it. | |
726 HeapRegion* r = _g1->heap_region_containing(start); | |
727 if (r == NULL) { | |
728 guarantee(_g1->is_in_permanent(start), "Or else where?"); | |
1705 | 729 // Again no need to return that this card contains refs that |
730 // point into the collection set. | |
731 return false; // Not in the G1 heap (might be in perm, for example.) | |
342 | 732 } |
733 // Why do we have to check here whether a card is on a young region, | |
734 // given that we dirty young regions and, as a result, the | |
735 // post-barrier is supposed to filter them out and never to enqueue | |
736 // them? When we allocate a new region as the "allocation region" we | |
737 // actually dirty its cards after we release the lock, since card | |
738 // dirtying while holding the lock was a performance bottleneck. So, | |
739 // as a result, it is possible for other threads to actually | |
740 // allocate objects in the region (after the acquire the lock) | |
741 // before all the cards on the region are dirtied. This is unlikely, | |
742 // and it doesn't happen often, but it can happen. So, the extra | |
743 // check below filters out those cards. | |
637
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6817419: G1: Enable extensive verification for humongous regions
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parents:
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744 if (r->is_young()) { |
1705 | 745 return false; |
342 | 746 } |
747 // While we are processing RSet buffers during the collection, we | |
748 // actually don't want to scan any cards on the collection set, | |
749 // since we don't want to update remebered sets with entries that | |
750 // point into the collection set, given that live objects from the | |
751 // collection set are about to move and such entries will be stale | |
752 // very soon. This change also deals with a reliability issue which | |
753 // involves scanning a card in the collection set and coming across | |
754 // an array that was being chunked and looking malformed. Note, | |
755 // however, that if evacuation fails, we have to scan any objects | |
756 // that were not moved and create any missing entries. | |
757 if (r->in_collection_set()) { | |
1705 | 758 return false; |
342 | 759 } |
760 | |
890
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761 // Should we defer processing the card? |
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762 // |
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763 // Previously the result from the insert_cache call would be |
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764 // either card_ptr (implying that card_ptr was currently "cold"), |
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|
765 // null (meaning we had inserted the card ptr into the "hot" |
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766 // cache, which had some headroom), or a "hot" card ptr |
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767 // extracted from the "hot" cache. |
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|
768 // |
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|
769 // Now that the _card_counts cache in the ConcurrentG1Refine |
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770 // instance is an evicting hash table, the result we get back |
6cb8e9df7174
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771 // could be from evicting the card ptr in an already occupied |
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772 // bucket (in which case we have replaced the card ptr in the |
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|
773 // bucket with card_ptr and "defer" is set to false). To avoid |
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|
774 // having a data structure (updates to which would need a lock) |
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775 // to hold these unprocessed dirty cards, we need to immediately |
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|
776 // process card_ptr. The actions needed to be taken on return |
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|
777 // from cache_insert are summarized in the following table: |
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|
778 // |
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|
779 // res defer action |
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|
780 // -------------------------------------------------------------- |
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781 // null false card evicted from _card_counts & replaced with |
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782 // card_ptr; evicted ptr added to hot cache. |
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783 // No need to process res; immediately process card_ptr |
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|
784 // |
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785 // null true card not evicted from _card_counts; card_ptr added |
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786 // to hot cache. |
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787 // Nothing to do. |
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|
788 // |
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789 // non-null false card evicted from _card_counts & replaced with |
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790 // card_ptr; evicted ptr is currently "cold" or |
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|
791 // caused an eviction from the hot cache. |
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|
792 // Immediately process res; process card_ptr. |
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|
793 // |
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794 // non-null true card not evicted from _card_counts; card_ptr is |
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795 // currently cold, or caused an eviction from hot |
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|
796 // cache. |
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|
797 // Immediately process res; no need to process card_ptr. |
342 | 798 |
1705 | 799 |
890
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|
800 jbyte* res = card_ptr; |
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|
801 bool defer = false; |
1705 | 802 |
803 // This gets set to true if the card being refined has references | |
804 // that point into the collection set. | |
805 bool oops_into_cset = false; | |
806 | |
890
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807 if (_cg1r->use_cache()) { |
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808 jbyte* res = _cg1r->cache_insert(card_ptr, &defer); |
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809 if (res != NULL && (res != card_ptr || defer)) { |
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810 start = _ct_bs->addr_for(res); |
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811 r = _g1->heap_region_containing(start); |
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812 if (r == NULL) { |
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813 assert(_g1->is_in_permanent(start), "Or else where?"); |
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|
814 } else { |
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815 // Checking whether the region we got back from the cache |
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816 // is young here is inappropriate. The region could have been |
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817 // freed, reallocated and tagged as young while in the cache. |
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818 // Hence we could see its young type change at any time. |
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819 // |
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820 // Process card pointer we get back from the hot card cache. This |
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821 // will check whether the region containing the card is young |
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822 // _after_ checking that the region has been allocated from. |
1705 | 823 oops_into_cset = concurrentRefineOneCard_impl(res, worker_i, |
824 false /* check_for_refs_into_cset */); | |
825 // The above call to concurrentRefineOneCard_impl is only | |
826 // performed if the hot card cache is enabled. This cache is | |
827 // disabled during an evacuation pause - which is the only | |
828 // time when we need know if the card contains references | |
829 // that point into the collection set. Also when the hot card | |
830 // cache is enabled, this code is executed by the concurrent | |
831 // refine threads - rather than the GC worker threads - and | |
832 // concurrentRefineOneCard_impl will return false. | |
833 assert(!oops_into_cset, "should not see true here"); | |
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834 } |
342 | 835 } |
836 } | |
837 | |
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838 if (!defer) { |
1705 | 839 oops_into_cset = |
840 concurrentRefineOneCard_impl(card_ptr, worker_i, check_for_refs_into_cset); | |
841 // We should only be detecting that the card contains references | |
842 // that point into the collection set if the current thread is | |
843 // a GC worker thread. | |
844 assert(!oops_into_cset || SafepointSynchronize::is_at_safepoint(), | |
845 "invalid result at non safepoint"); | |
342 | 846 } |
1705 | 847 return oops_into_cset; |
342 | 848 } |
849 | |
850 class HRRSStatsIter: public HeapRegionClosure { | |
851 size_t _occupied; | |
852 size_t _total_mem_sz; | |
853 size_t _max_mem_sz; | |
854 HeapRegion* _max_mem_sz_region; | |
855 public: | |
856 HRRSStatsIter() : | |
857 _occupied(0), | |
858 _total_mem_sz(0), | |
859 _max_mem_sz(0), | |
860 _max_mem_sz_region(NULL) | |
861 {} | |
862 | |
863 bool doHeapRegion(HeapRegion* r) { | |
864 if (r->continuesHumongous()) return false; | |
865 size_t mem_sz = r->rem_set()->mem_size(); | |
866 if (mem_sz > _max_mem_sz) { | |
867 _max_mem_sz = mem_sz; | |
868 _max_mem_sz_region = r; | |
869 } | |
870 _total_mem_sz += mem_sz; | |
871 size_t occ = r->rem_set()->occupied(); | |
872 _occupied += occ; | |
873 return false; | |
874 } | |
875 size_t total_mem_sz() { return _total_mem_sz; } | |
876 size_t max_mem_sz() { return _max_mem_sz; } | |
877 size_t occupied() { return _occupied; } | |
878 HeapRegion* max_mem_sz_region() { return _max_mem_sz_region; } | |
879 }; | |
880 | |
794 | 881 class PrintRSThreadVTimeClosure : public ThreadClosure { |
882 public: | |
883 virtual void do_thread(Thread *t) { | |
884 ConcurrentG1RefineThread* crt = (ConcurrentG1RefineThread*) t; | |
885 gclog_or_tty->print(" %5.2f", crt->vtime_accum()); | |
886 } | |
887 }; | |
888 | |
1861 | 889 void G1RemSet::print_summary_info() { |
342 | 890 G1CollectedHeap* g1 = G1CollectedHeap::heap(); |
891 | |
892 #if CARD_REPEAT_HISTO | |
893 gclog_or_tty->print_cr("\nG1 card_repeat count histogram: "); | |
894 gclog_or_tty->print_cr(" # of repeats --> # of cards with that number."); | |
895 card_repeat_count.print_on(gclog_or_tty); | |
896 #endif | |
897 | |
898 if (FILTEROUTOFREGIONCLOSURE_DOHISTOGRAMCOUNT) { | |
899 gclog_or_tty->print_cr("\nG1 rem-set out-of-region histogram: "); | |
900 gclog_or_tty->print_cr(" # of CS ptrs --> # of cards with that number."); | |
901 out_of_histo.print_on(gclog_or_tty); | |
902 } | |
794 | 903 gclog_or_tty->print_cr("\n Concurrent RS processed %d cards", |
904 _conc_refine_cards); | |
342 | 905 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
906 jint tot_processed_buffers = | |
907 dcqs.processed_buffers_mut() + dcqs.processed_buffers_rs_thread(); | |
908 gclog_or_tty->print_cr(" Of %d completed buffers:", tot_processed_buffers); | |
794 | 909 gclog_or_tty->print_cr(" %8d (%5.1f%%) by conc RS threads.", |
342 | 910 dcqs.processed_buffers_rs_thread(), |
911 100.0*(float)dcqs.processed_buffers_rs_thread()/ | |
912 (float)tot_processed_buffers); | |
913 gclog_or_tty->print_cr(" %8d (%5.1f%%) by mutator threads.", | |
914 dcqs.processed_buffers_mut(), | |
915 100.0*(float)dcqs.processed_buffers_mut()/ | |
916 (float)tot_processed_buffers); | |
794 | 917 gclog_or_tty->print_cr(" Conc RS threads times(s)"); |
918 PrintRSThreadVTimeClosure p; | |
919 gclog_or_tty->print(" "); | |
920 g1->concurrent_g1_refine()->threads_do(&p); | |
342 | 921 gclog_or_tty->print_cr(""); |
794 | 922 |
1861 | 923 HRRSStatsIter blk; |
924 g1->heap_region_iterate(&blk); | |
925 gclog_or_tty->print_cr(" Total heap region rem set sizes = " SIZE_FORMAT "K." | |
926 " Max = " SIZE_FORMAT "K.", | |
927 blk.total_mem_sz()/K, blk.max_mem_sz()/K); | |
928 gclog_or_tty->print_cr(" Static structures = " SIZE_FORMAT "K," | |
929 " free_lists = " SIZE_FORMAT "K.", | |
930 HeapRegionRemSet::static_mem_size()/K, | |
931 HeapRegionRemSet::fl_mem_size()/K); | |
932 gclog_or_tty->print_cr(" %d occupied cards represented.", | |
933 blk.occupied()); | |
934 gclog_or_tty->print_cr(" Max sz region = [" PTR_FORMAT ", " PTR_FORMAT " )" | |
935 ", cap = " SIZE_FORMAT "K, occ = " SIZE_FORMAT "K.", | |
936 blk.max_mem_sz_region()->bottom(), blk.max_mem_sz_region()->end(), | |
937 (blk.max_mem_sz_region()->rem_set()->mem_size() + K - 1)/K, | |
938 (blk.max_mem_sz_region()->rem_set()->occupied() + K - 1)/K); | |
939 gclog_or_tty->print_cr(" Did %d coarsenings.", HeapRegionRemSet::n_coarsenings()); | |
342 | 940 } |
1705 | 941 |
1861 | 942 void G1RemSet::prepare_for_verify() { |
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943 if (G1HRRSFlushLogBuffersOnVerify && |
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944 (VerifyBeforeGC || VerifyAfterGC) |
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945 && !_g1->full_collection()) { |
342 | 946 cleanupHRRS(); |
947 _g1->set_refine_cte_cl_concurrency(false); | |
948 if (SafepointSynchronize::is_at_safepoint()) { | |
949 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
950 dcqs.concatenate_logs(); | |
951 } | |
952 bool cg1r_use_cache = _cg1r->use_cache(); | |
953 _cg1r->set_use_cache(false); | |
1705 | 954 DirtyCardQueue into_cset_dcq(&_g1->into_cset_dirty_card_queue_set()); |
955 updateRS(&into_cset_dcq, 0); | |
956 _g1->into_cset_dirty_card_queue_set().clear(); | |
342 | 957 _cg1r->set_use_cache(cg1r_use_cache); |
637
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958 |
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959 assert(JavaThread::dirty_card_queue_set().completed_buffers_num() == 0, "All should be consumed"); |
342 | 960 } |
961 } |