Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/concurrentG1Refine.cpp @ 751:20c6f43950b5
6490395: G1: Tidy up command line flags.
Summary: Change G1 flag names to be more consistent and disable some in 'product' mode.
Reviewed-by: tonyp, iveresov
author | johnc |
---|---|
date | Thu, 30 Apr 2009 15:07:53 -0700 |
parents | 25e146966e7c |
children | 315a5d70b295 |
rev | line source |
---|---|
342 | 1 /* |
2 * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_concurrentG1Refine.cpp.incl" | |
27 | |
28 bool ConcurrentG1Refine::_enabled = false; | |
29 | |
30 ConcurrentG1Refine::ConcurrentG1Refine() : | |
31 _pya(PYA_continue), _last_pya(PYA_continue), | |
32 _last_cards_during(), _first_traversal(false), | |
33 _card_counts(NULL), _cur_card_count_histo(NULL), _cum_card_count_histo(NULL), | |
34 _hot_cache(NULL), | |
35 _def_use_cache(false), _use_cache(false), | |
36 _n_periods(0), _total_cards(0), _total_travs(0) | |
37 { | |
38 if (G1ConcRefine) { | |
39 _cg1rThread = new ConcurrentG1RefineThread(this); | |
40 assert(cg1rThread() != NULL, "Conc refine should have been created"); | |
41 assert(cg1rThread()->cg1r() == this, | |
42 "Conc refine thread should refer to this"); | |
43 } else { | |
44 _cg1rThread = NULL; | |
45 } | |
46 } | |
47 | |
48 void ConcurrentG1Refine::init() { | |
49 if (G1ConcRSLogCacheSize > 0 || G1ConcRSCountTraversals) { | |
50 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
51 _n_card_counts = | |
52 (unsigned) (g1h->g1_reserved_obj_bytes() >> CardTableModRefBS::card_shift); | |
53 _card_counts = NEW_C_HEAP_ARRAY(unsigned char, _n_card_counts); | |
54 for (size_t i = 0; i < _n_card_counts; i++) _card_counts[i] = 0; | |
55 ModRefBarrierSet* bs = g1h->mr_bs(); | |
56 guarantee(bs->is_a(BarrierSet::CardTableModRef), "Precondition"); | |
57 CardTableModRefBS* ctbs = (CardTableModRefBS*)bs; | |
58 _ct_bot = ctbs->byte_for_const(g1h->reserved_region().start()); | |
59 if (G1ConcRSCountTraversals) { | |
60 _cur_card_count_histo = NEW_C_HEAP_ARRAY(unsigned, 256); | |
61 _cum_card_count_histo = NEW_C_HEAP_ARRAY(unsigned, 256); | |
62 for (int i = 0; i < 256; i++) { | |
63 _cur_card_count_histo[i] = 0; | |
64 _cum_card_count_histo[i] = 0; | |
65 } | |
66 } | |
67 } | |
68 if (G1ConcRSLogCacheSize > 0) { | |
69 _def_use_cache = true; | |
70 _use_cache = true; | |
71 _hot_cache_size = (1 << G1ConcRSLogCacheSize); | |
72 _hot_cache = NEW_C_HEAP_ARRAY(jbyte*, _hot_cache_size); | |
73 _n_hot = 0; | |
74 _hot_cache_idx = 0; | |
75 } | |
76 } | |
77 | |
78 ConcurrentG1Refine::~ConcurrentG1Refine() { | |
79 if (G1ConcRSLogCacheSize > 0 || G1ConcRSCountTraversals) { | |
80 assert(_card_counts != NULL, "Logic"); | |
81 FREE_C_HEAP_ARRAY(unsigned char, _card_counts); | |
82 assert(_cur_card_count_histo != NULL, "Logic"); | |
83 FREE_C_HEAP_ARRAY(unsigned, _cur_card_count_histo); | |
84 assert(_cum_card_count_histo != NULL, "Logic"); | |
85 FREE_C_HEAP_ARRAY(unsigned, _cum_card_count_histo); | |
86 } | |
87 if (G1ConcRSLogCacheSize > 0) { | |
88 assert(_hot_cache != NULL, "Logic"); | |
89 FREE_C_HEAP_ARRAY(jbyte*, _hot_cache); | |
90 } | |
91 } | |
92 | |
93 bool ConcurrentG1Refine::refine() { | |
94 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
95 unsigned cards_before = g1h->g1_rem_set()->conc_refine_cards(); | |
96 clear_hot_cache(); // Any previous values in this are now invalid. | |
97 g1h->g1_rem_set()->concurrentRefinementPass(this); | |
98 _traversals++; | |
99 unsigned cards_after = g1h->g1_rem_set()->conc_refine_cards(); | |
100 unsigned cards_during = cards_after-cards_before; | |
101 // If this is the first traversal in the current enabling | |
102 // and we did some cards, or if the number of cards found is decreasing | |
103 // sufficiently quickly, then keep going. Otherwise, sleep a while. | |
104 bool res = | |
105 (_first_traversal && cards_during > 0) | |
106 || | |
107 (!_first_traversal && cards_during * 3 < _last_cards_during * 2); | |
108 _last_cards_during = cards_during; | |
109 _first_traversal = false; | |
110 return res; | |
111 } | |
112 | |
113 void ConcurrentG1Refine::enable() { | |
114 MutexLocker x(G1ConcRefine_mon); | |
115 if (!_enabled) { | |
116 _enabled = true; | |
117 _first_traversal = true; _last_cards_during = 0; | |
118 G1ConcRefine_mon->notify_all(); | |
119 } | |
120 } | |
121 | |
122 unsigned ConcurrentG1Refine::disable() { | |
123 MutexLocker x(G1ConcRefine_mon); | |
124 if (_enabled) { | |
125 _enabled = false; | |
126 return _traversals; | |
127 } else { | |
128 return 0; | |
129 } | |
130 } | |
131 | |
132 void ConcurrentG1Refine::wait_for_ConcurrentG1Refine_enabled() { | |
133 G1ConcRefine_mon->lock(); | |
134 while (!_enabled) { | |
135 G1ConcRefine_mon->wait(Mutex::_no_safepoint_check_flag); | |
136 } | |
137 G1ConcRefine_mon->unlock(); | |
138 _traversals = 0; | |
139 }; | |
140 | |
141 void ConcurrentG1Refine::set_pya_restart() { | |
142 // If we're using the log-based RS barrier, the above will cause | |
143 // in-progress traversals of completed log buffers to quit early; we will | |
144 // also abandon all other buffers. | |
145 if (G1RSBarrierUseQueue) { | |
146 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
147 dcqs.abandon_logs(); | |
637
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
342
diff
changeset
|
148 // Reset the post-yield actions. |
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
342
diff
changeset
|
149 _pya = PYA_continue; |
25e146966e7c
6817419: G1: Enable extensive verification for humongous regions
iveresov
parents:
342
diff
changeset
|
150 _last_pya = PYA_continue; |
342 | 151 } else { |
152 _pya = PYA_restart; | |
153 } | |
154 } | |
155 | |
156 void ConcurrentG1Refine::set_pya_cancel() { | |
157 _pya = PYA_cancel; | |
158 } | |
159 | |
160 PostYieldAction ConcurrentG1Refine::get_pya() { | |
161 if (_pya != PYA_continue) { | |
162 jint val = _pya; | |
163 while (true) { | |
164 jint val_read = Atomic::cmpxchg(PYA_continue, &_pya, val); | |
165 if (val_read == val) { | |
166 PostYieldAction res = (PostYieldAction)val; | |
167 assert(res != PYA_continue, "Only the refine thread should reset."); | |
168 _last_pya = res; | |
169 return res; | |
170 } else { | |
171 val = val_read; | |
172 } | |
173 } | |
174 } | |
175 // QQQ WELL WHAT DO WE RETURN HERE??? | |
176 // make up something! | |
177 return PYA_continue; | |
178 } | |
179 | |
180 PostYieldAction ConcurrentG1Refine::get_last_pya() { | |
181 PostYieldAction res = _last_pya; | |
182 _last_pya = PYA_continue; | |
183 return res; | |
184 } | |
185 | |
186 bool ConcurrentG1Refine::do_traversal() { | |
187 return _cg1rThread->do_traversal(); | |
188 } | |
189 | |
190 int ConcurrentG1Refine::add_card_count(jbyte* card_ptr) { | |
191 size_t card_num = (card_ptr - _ct_bot); | |
192 guarantee(0 <= card_num && card_num < _n_card_counts, "Bounds"); | |
193 unsigned char cnt = _card_counts[card_num]; | |
194 if (cnt < 255) _card_counts[card_num]++; | |
195 return cnt; | |
196 _total_travs++; | |
197 } | |
198 | |
199 jbyte* ConcurrentG1Refine::cache_insert(jbyte* card_ptr) { | |
200 int count = add_card_count(card_ptr); | |
201 // Count previously unvisited cards. | |
202 if (count == 0) _total_cards++; | |
203 // We'll assume a traversal unless we store it in the cache. | |
204 if (count < G1ConcRSHotCardLimit) { | |
205 _total_travs++; | |
206 return card_ptr; | |
207 } | |
208 // Otherwise, it's hot. | |
209 jbyte* res = NULL; | |
210 MutexLockerEx x(HotCardCache_lock, Mutex::_no_safepoint_check_flag); | |
211 if (_n_hot == _hot_cache_size) { | |
212 _total_travs++; | |
213 res = _hot_cache[_hot_cache_idx]; | |
214 _n_hot--; | |
215 } | |
216 // Now _n_hot < _hot_cache_size, and we can insert at _hot_cache_idx. | |
217 _hot_cache[_hot_cache_idx] = card_ptr; | |
218 _hot_cache_idx++; | |
219 if (_hot_cache_idx == _hot_cache_size) _hot_cache_idx = 0; | |
220 _n_hot++; | |
221 return res; | |
222 } | |
223 | |
224 | |
225 void ConcurrentG1Refine::clean_up_cache(int worker_i, G1RemSet* g1rs) { | |
226 assert(!use_cache(), "cache should be disabled"); | |
227 int start_ind = _hot_cache_idx-1; | |
228 for (int i = 0; i < _n_hot; i++) { | |
229 int ind = start_ind - i; | |
230 if (ind < 0) ind = ind + _hot_cache_size; | |
231 jbyte* entry = _hot_cache[ind]; | |
232 if (entry != NULL) { | |
233 g1rs->concurrentRefineOneCard(entry, worker_i); | |
234 } | |
235 } | |
236 _n_hot = 0; | |
237 _hot_cache_idx = 0; | |
238 } | |
239 | |
240 void ConcurrentG1Refine::clear_and_record_card_counts() { | |
241 if (G1ConcRSLogCacheSize == 0 && !G1ConcRSCountTraversals) return; | |
242 _n_periods++; | |
243 if (G1ConcRSCountTraversals) { | |
244 for (size_t i = 0; i < _n_card_counts; i++) { | |
245 unsigned char bucket = _card_counts[i]; | |
246 _cur_card_count_histo[bucket]++; | |
247 _card_counts[i] = 0; | |
248 } | |
249 gclog_or_tty->print_cr("Card counts:"); | |
250 for (int i = 0; i < 256; i++) { | |
251 if (_cur_card_count_histo[i] > 0) { | |
252 gclog_or_tty->print_cr(" %3d: %9d", i, _cur_card_count_histo[i]); | |
253 _cum_card_count_histo[i] += _cur_card_count_histo[i]; | |
254 _cur_card_count_histo[i] = 0; | |
255 } | |
256 } | |
257 } else { | |
258 assert(G1ConcRSLogCacheSize > 0, "Logic"); | |
259 Copy::fill_to_words((HeapWord*)(&_card_counts[0]), | |
260 _n_card_counts / HeapWordSize); | |
261 } | |
262 } | |
263 | |
264 void | |
265 ConcurrentG1Refine:: | |
266 print_card_count_histo_range(unsigned* histo, int from, int to, | |
267 float& cum_card_pct, | |
268 float& cum_travs_pct) { | |
269 unsigned cards = 0; | |
270 unsigned travs = 0; | |
271 guarantee(to <= 256, "Precondition"); | |
272 for (int i = from; i < to-1; i++) { | |
273 cards += histo[i]; | |
274 travs += histo[i] * i; | |
275 } | |
276 if (to == 256) { | |
277 unsigned histo_card_sum = 0; | |
278 unsigned histo_trav_sum = 0; | |
279 for (int i = 1; i < 255; i++) { | |
280 histo_trav_sum += histo[i] * i; | |
281 } | |
282 cards += histo[255]; | |
283 // correct traversals for the last one. | |
284 unsigned travs_255 = (unsigned) (_total_travs - histo_trav_sum); | |
285 travs += travs_255; | |
286 | |
287 } else { | |
288 cards += histo[to-1]; | |
289 travs += histo[to-1] * (to-1); | |
290 } | |
291 float fperiods = (float)_n_periods; | |
292 float f_tot_cards = (float)_total_cards/fperiods; | |
293 float f_tot_travs = (float)_total_travs/fperiods; | |
294 if (cards > 0) { | |
295 float fcards = (float)cards/fperiods; | |
296 float ftravs = (float)travs/fperiods; | |
297 if (to == 256) { | |
298 gclog_or_tty->print(" %4d- %10.2f%10.2f", from, fcards, ftravs); | |
299 } else { | |
300 gclog_or_tty->print(" %4d-%4d %10.2f%10.2f", from, to-1, fcards, ftravs); | |
301 } | |
302 float pct_cards = fcards*100.0/f_tot_cards; | |
303 cum_card_pct += pct_cards; | |
304 float pct_travs = ftravs*100.0/f_tot_travs; | |
305 cum_travs_pct += pct_travs; | |
306 gclog_or_tty->print_cr("%10.2f%10.2f%10.2f%10.2f", | |
307 pct_cards, cum_card_pct, | |
308 pct_travs, cum_travs_pct); | |
309 } | |
310 } | |
311 | |
312 void ConcurrentG1Refine::print_final_card_counts() { | |
313 if (!G1ConcRSCountTraversals) return; | |
314 | |
315 gclog_or_tty->print_cr("Did %d total traversals of %d distinct cards.", | |
316 _total_travs, _total_cards); | |
317 float fperiods = (float)_n_periods; | |
318 gclog_or_tty->print_cr(" This is an average of %8.2f traversals, %8.2f cards, " | |
319 "per collection.", (float)_total_travs/fperiods, | |
320 (float)_total_cards/fperiods); | |
321 gclog_or_tty->print_cr(" This is an average of %8.2f traversals/distinct " | |
322 "dirty card.\n", | |
323 _total_cards > 0 ? | |
324 (float)_total_travs/(float)_total_cards : 0.0); | |
325 | |
326 | |
327 gclog_or_tty->print_cr("Histogram:\n\n%10s %10s%10s%10s%10s%10s%10s", | |
328 "range", "# cards", "# travs", "% cards", "(cum)", | |
329 "% travs", "(cum)"); | |
330 gclog_or_tty->print_cr("------------------------------------------------------------" | |
331 "-------------"); | |
332 float cum_cards_pct = 0.0; | |
333 float cum_travs_pct = 0.0; | |
334 for (int i = 1; i < 10; i++) { | |
335 print_card_count_histo_range(_cum_card_count_histo, i, i+1, | |
336 cum_cards_pct, cum_travs_pct); | |
337 } | |
338 for (int i = 10; i < 100; i += 10) { | |
339 print_card_count_histo_range(_cum_card_count_histo, i, i+10, | |
340 cum_cards_pct, cum_travs_pct); | |
341 } | |
342 print_card_count_histo_range(_cum_card_count_histo, 100, 150, | |
343 cum_cards_pct, cum_travs_pct); | |
344 print_card_count_histo_range(_cum_card_count_histo, 150, 200, | |
345 cum_cards_pct, cum_travs_pct); | |
346 print_card_count_histo_range(_cum_card_count_histo, 150, 255, | |
347 cum_cards_pct, cum_travs_pct); | |
348 print_card_count_histo_range(_cum_card_count_histo, 255, 256, | |
349 cum_cards_pct, cum_travs_pct); | |
350 } |