Tue, 26 Jan 2010 16:52:29 -0800
6920090: G1: Disable ReduceInitialCardMarks at least until 6920109 is fixed
Summary: G1 now answers "no" to the query can_elide_initializing_store_barrier() in the product build. A debug flag allows alternate behaviour in debug builds.
Reviewed-by: iveresov, tonyp
1 /*
2 * Copyright 2001-2009 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 */
25 #include "incls/_precompiled.incl"
26 #include "incls/_survRateGroup.cpp.incl"
28 SurvRateGroup::SurvRateGroup(G1CollectorPolicy* g1p,
29 const char* name,
30 size_t summary_surv_rates_len) :
31 _g1p(g1p), _name(name),
32 _summary_surv_rates_len(summary_surv_rates_len),
33 _summary_surv_rates_max_len(0),
34 _summary_surv_rates(NULL),
35 _surv_rate(NULL),
36 _accum_surv_rate_pred(NULL),
37 _surv_rate_pred(NULL)
38 {
39 reset();
40 if (summary_surv_rates_len > 0) {
41 size_t length = summary_surv_rates_len;
42 _summary_surv_rates = NEW_C_HEAP_ARRAY(NumberSeq*, length);
43 if (_summary_surv_rates == NULL) {
44 vm_exit_out_of_memory(sizeof(NumberSeq*) * length,
45 "Not enough space for surv rate summary");
46 }
47 for (size_t i = 0; i < length; ++i)
48 _summary_surv_rates[i] = new NumberSeq();
49 }
51 start_adding_regions();
52 }
55 void SurvRateGroup::reset()
56 {
57 _all_regions_allocated = 0;
58 _scan_only_prefix = 0;
59 _setup_seq_num = 0;
60 _stats_arrays_length = 0;
61 _accum_surv_rate = 0.0;
62 _last_pred = 0.0;
63 // the following will set up the arrays with length 1
64 _region_num = 1;
65 stop_adding_regions();
66 guarantee( _stats_arrays_length == 1, "invariant" );
67 guarantee( _surv_rate_pred[0] != NULL, "invariant" );
68 _surv_rate_pred[0]->add(0.4);
69 all_surviving_words_recorded(false);
70 _region_num = 0;
71 }
74 void
75 SurvRateGroup::start_adding_regions() {
76 _setup_seq_num = _stats_arrays_length;
77 _region_num = _scan_only_prefix;
78 _accum_surv_rate = 0.0;
80 #if 0
81 gclog_or_tty->print_cr("[%s] start adding regions, seq num %d, length %d",
82 _name, _setup_seq_num, _region_num);
83 #endif // 0
84 }
86 void
87 SurvRateGroup::stop_adding_regions() {
89 #if 0
90 gclog_or_tty->print_cr("[%s] stop adding regions, length %d", _name, _region_num);
91 #endif // 0
93 if (_region_num > _stats_arrays_length) {
94 double* old_surv_rate = _surv_rate;
95 double* old_accum_surv_rate_pred = _accum_surv_rate_pred;
96 TruncatedSeq** old_surv_rate_pred = _surv_rate_pred;
98 _surv_rate = NEW_C_HEAP_ARRAY(double, _region_num);
99 if (_surv_rate == NULL) {
100 vm_exit_out_of_memory(sizeof(double) * _region_num,
101 "Not enough space for surv rate array.");
102 }
103 _accum_surv_rate_pred = NEW_C_HEAP_ARRAY(double, _region_num);
104 if (_accum_surv_rate_pred == NULL) {
105 vm_exit_out_of_memory(sizeof(double) * _region_num,
106 "Not enough space for accum surv rate pred array.");
107 }
108 _surv_rate_pred = NEW_C_HEAP_ARRAY(TruncatedSeq*, _region_num);
109 if (_surv_rate == NULL) {
110 vm_exit_out_of_memory(sizeof(TruncatedSeq*) * _region_num,
111 "Not enough space for surv rate pred array.");
112 }
114 for (size_t i = 0; i < _stats_arrays_length; ++i)
115 _surv_rate_pred[i] = old_surv_rate_pred[i];
117 #if 0
118 gclog_or_tty->print_cr("[%s] stop adding regions, new seqs %d to %d",
119 _name, _array_length, _region_num - 1);
120 #endif // 0
122 for (size_t i = _stats_arrays_length; i < _region_num; ++i) {
123 _surv_rate_pred[i] = new TruncatedSeq(10);
124 // _surv_rate_pred[i]->add(last_pred);
125 }
127 _stats_arrays_length = _region_num;
129 if (old_surv_rate != NULL)
130 FREE_C_HEAP_ARRAY(double, old_surv_rate);
131 if (old_accum_surv_rate_pred != NULL)
132 FREE_C_HEAP_ARRAY(double, old_accum_surv_rate_pred);
133 if (old_surv_rate_pred != NULL)
134 FREE_C_HEAP_ARRAY(NumberSeq*, old_surv_rate_pred);
135 }
137 for (size_t i = 0; i < _stats_arrays_length; ++i)
138 _surv_rate[i] = 0.0;
139 }
141 double
142 SurvRateGroup::accum_surv_rate(size_t adjustment) {
143 // we might relax this one in the future...
144 guarantee( adjustment == 0 || adjustment == 1, "pre-condition" );
146 double ret = _accum_surv_rate;
147 if (adjustment > 0) {
148 TruncatedSeq* seq = get_seq(_region_num+1);
149 double surv_rate = _g1p->get_new_prediction(seq);
150 ret += surv_rate;
151 }
153 return ret;
154 }
156 int
157 SurvRateGroup::next_age_index() {
158 TruncatedSeq* seq = get_seq(_region_num);
159 double surv_rate = _g1p->get_new_prediction(seq);
160 _accum_surv_rate += surv_rate;
162 ++_region_num;
163 return (int) ++_all_regions_allocated;
164 }
166 void
167 SurvRateGroup::record_scan_only_prefix(size_t scan_only_prefix) {
168 guarantee( scan_only_prefix <= _region_num, "pre-condition" );
169 _scan_only_prefix = scan_only_prefix;
170 }
172 void
173 SurvRateGroup::record_surviving_words(int age_in_group, size_t surv_words) {
174 guarantee( 0 <= age_in_group && (size_t) age_in_group < _region_num,
175 "pre-condition" );
176 guarantee( _surv_rate[age_in_group] <= 0.00001,
177 "should only update each slot once" );
179 double surv_rate = (double) surv_words / (double) HeapRegion::GrainWords;
180 _surv_rate[age_in_group] = surv_rate;
181 _surv_rate_pred[age_in_group]->add(surv_rate);
182 if ((size_t)age_in_group < _summary_surv_rates_len) {
183 _summary_surv_rates[age_in_group]->add(surv_rate);
184 if ((size_t)(age_in_group+1) > _summary_surv_rates_max_len)
185 _summary_surv_rates_max_len = age_in_group+1;
186 }
187 }
189 void
190 SurvRateGroup::all_surviving_words_recorded(bool propagate) {
191 if (propagate && _region_num > 0) { // conservative
192 double surv_rate = _surv_rate_pred[_region_num-1]->last();
194 #if 0
195 gclog_or_tty->print_cr("propagating %1.2lf from %d to %d",
196 surv_rate, _curr_length, _array_length - 1);
197 #endif // 0
199 for (size_t i = _region_num; i < _stats_arrays_length; ++i) {
200 guarantee( _surv_rate[i] <= 0.00001,
201 "the slot should not have been updated" );
202 _surv_rate_pred[i]->add(surv_rate);
203 }
204 }
206 double accum = 0.0;
207 double pred = 0.0;
208 for (size_t i = 0; i < _stats_arrays_length; ++i) {
209 pred = _g1p->get_new_prediction(_surv_rate_pred[i]);
210 if (pred > 1.0) pred = 1.0;
211 accum += pred;
212 _accum_surv_rate_pred[i] = accum;
213 // gclog_or_tty->print_cr("age %3d, accum %10.2lf", i, accum);
214 }
215 _last_pred = pred;
216 }
218 #ifndef PRODUCT
219 void
220 SurvRateGroup::print() {
221 gclog_or_tty->print_cr("Surv Rate Group: %s (%d entries, %d scan-only)",
222 _name, _region_num, _scan_only_prefix);
223 for (size_t i = 0; i < _region_num; ++i) {
224 gclog_or_tty->print_cr(" age %4d surv rate %6.2lf %% pred %6.2lf %%%s",
225 i, _surv_rate[i] * 100.0,
226 _g1p->get_new_prediction(_surv_rate_pred[i]) * 100.0,
227 (i < _scan_only_prefix) ? " S-O" : " ");
228 }
229 }
231 void
232 SurvRateGroup::print_surv_rate_summary() {
233 size_t length = _summary_surv_rates_max_len;
234 if (length == 0)
235 return;
237 gclog_or_tty->print_cr("");
238 gclog_or_tty->print_cr("%s Rate Summary (for up to age %d)", _name, length-1);
239 gclog_or_tty->print_cr(" age range survival rate (avg) samples (avg)");
240 gclog_or_tty->print_cr(" ---------------------------------------------------------");
242 size_t index = 0;
243 size_t limit = MIN2((int) length, 10);
244 while (index < limit) {
245 gclog_or_tty->print_cr(" %4d %6.2lf%% %6.2lf",
246 index, _summary_surv_rates[index]->avg() * 100.0,
247 (double) _summary_surv_rates[index]->num());
248 ++index;
249 }
251 gclog_or_tty->print_cr(" ---------------------------------------------------------");
253 int num = 0;
254 double sum = 0.0;
255 int samples = 0;
256 while (index < length) {
257 ++num;
258 sum += _summary_surv_rates[index]->avg() * 100.0;
259 samples += _summary_surv_rates[index]->num();
260 ++index;
262 if (index == length || num % 10 == 0) {
263 gclog_or_tty->print_cr(" %4d .. %4d %6.2lf%% %6.2lf",
264 (index-1) / 10 * 10, index-1, sum / (double) num,
265 (double) samples / (double) num);
266 sum = 0.0;
267 num = 0;
268 samples = 0;
269 }
270 }
272 gclog_or_tty->print_cr(" ---------------------------------------------------------");
273 }
274 #endif // PRODUCT