1 /*
2 * Copyright (c) 2001, 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "gc/g1/g1CollectedHeap.inline.hpp"
27 #include "gc/g1/g1Predictions.hpp"
28 #include "gc/g1/heapRegion.hpp"
29 #include "gc/g1/survRateGroup.hpp"
30 #include "memory/allocation.hpp"
31
32 SurvRateGroup::SurvRateGroup(G1Predictions* predictor,
33 const char* name,
34 size_t summary_surv_rates_len) :
35 _predictor(predictor), _name(name),
36 _summary_surv_rates_len(summary_surv_rates_len),
37 _summary_surv_rates_max_len(0),
38 _summary_surv_rates(NULL),
39 _surv_rate(NULL),
40 _accum_surv_rate_pred(NULL),
41 _surv_rate_pred(NULL),
42 _stats_arrays_length(0) {
43 reset();
44 if (summary_surv_rates_len > 0) {
45 size_t length = summary_surv_rates_len;
46 _summary_surv_rates = NEW_C_HEAP_ARRAY(NumberSeq*, length, mtGC);
47 for (size_t i = 0; i < length; ++i) {
48 _summary_surv_rates[i] = new NumberSeq();
49 }
50 }
51
52 start_adding_regions();
53 }
54
55 double SurvRateGroup::get_new_prediction(TruncatedSeq const* seq) const {
56 return _predictor->get_new_prediction(seq);
57 }
58
59 void SurvRateGroup::reset() {
60 _all_regions_allocated = 0;
61 _setup_seq_num = 0;
62 _last_pred = 0.0;
63 // the following will set up the arrays with length 1
64 _region_num = 1;
65
66 // The call to stop_adding_regions() will use "new" to refill
67 // the _surv_rate_pred array, so we need to make sure to call
68 // "delete".
69 for (size_t i = 0; i < _stats_arrays_length; ++i) {
70 delete _surv_rate_pred[i];
71 }
72 _stats_arrays_length = 0;
73
74 stop_adding_regions();
75 guarantee( _stats_arrays_length == 1, "invariant" );
76 guarantee( _surv_rate_pred[0] != NULL, "invariant" );
77 _surv_rate_pred[0]->add(0.4);
78 all_surviving_words_recorded(false);
79 _region_num = 0;
80 }
81
82 void SurvRateGroup::start_adding_regions() {
83 _setup_seq_num = _stats_arrays_length;
84 _region_num = 0;
85 }
86
87 void SurvRateGroup::stop_adding_regions() {
88 if (_region_num > _stats_arrays_length) {
89 double* old_surv_rate = _surv_rate;
90 double* old_accum_surv_rate_pred = _accum_surv_rate_pred;
91 TruncatedSeq** old_surv_rate_pred = _surv_rate_pred;
92
93 _surv_rate = NEW_C_HEAP_ARRAY(double, _region_num, mtGC);
94 _accum_surv_rate_pred = NEW_C_HEAP_ARRAY(double, _region_num, mtGC);
95 _surv_rate_pred = NEW_C_HEAP_ARRAY(TruncatedSeq*, _region_num, mtGC);
96
97 for (size_t i = 0; i < _stats_arrays_length; ++i) {
98 _surv_rate_pred[i] = old_surv_rate_pred[i];
99 }
100 for (size_t i = _stats_arrays_length; i < _region_num; ++i) {
101 _surv_rate_pred[i] = new TruncatedSeq(10);
102 }
103
104 _stats_arrays_length = _region_num;
105
106 if (old_surv_rate != NULL) {
107 FREE_C_HEAP_ARRAY(double, old_surv_rate);
108 }
109 if (old_accum_surv_rate_pred != NULL) {
110 FREE_C_HEAP_ARRAY(double, old_accum_surv_rate_pred);
111 }
112 if (old_surv_rate_pred != NULL) {
113 FREE_C_HEAP_ARRAY(TruncatedSeq*, old_surv_rate_pred);
114 }
115 }
116
117 for (size_t i = 0; i < _stats_arrays_length; ++i) {
118 _surv_rate[i] = 0.0;
119 }
120 }
121
122 int SurvRateGroup::next_age_index() {
123 ++_region_num;
124 return (int) ++_all_regions_allocated;
125 }
126
127 void SurvRateGroup::record_surviving_words(int age_in_group, size_t surv_words) {
128 guarantee( 0 <= age_in_group && (size_t) age_in_group < _region_num,
129 "pre-condition" );
130 guarantee( _surv_rate[age_in_group] <= 0.00001,
131 "should only update each slot once" );
132
133 double surv_rate = (double) surv_words / (double) HeapRegion::GrainWords;
134 _surv_rate[age_in_group] = surv_rate;
135 _surv_rate_pred[age_in_group]->add(surv_rate);
136 if ((size_t)age_in_group < _summary_surv_rates_len) {
137 _summary_surv_rates[age_in_group]->add(surv_rate);
138 if ((size_t)(age_in_group+1) > _summary_surv_rates_max_len)
139 _summary_surv_rates_max_len = age_in_group+1;
140 }
141 }
142
143 void SurvRateGroup::all_surviving_words_recorded(bool update_predictors) {
144 if (update_predictors && _region_num > 0) { // conservative
145 double surv_rate = _surv_rate_pred[_region_num-1]->last();
146 for (size_t i = _region_num; i < _stats_arrays_length; ++i) {
147 guarantee( _surv_rate[i] <= 0.00001,
148 "the slot should not have been updated" );
149 _surv_rate_pred[i]->add(surv_rate);
150 }
151 }
152
153 double accum = 0.0;
154 double pred = 0.0;
155 for (size_t i = 0; i < _stats_arrays_length; ++i) {
156 pred = get_new_prediction(_surv_rate_pred[i]);
157 if (pred > 1.0) pred = 1.0;
158 accum += pred;
159 _accum_surv_rate_pred[i] = accum;
160 }
161 _last_pred = pred;
162 }
163
164 #ifndef PRODUCT
165 void SurvRateGroup::print() {
166 gclog_or_tty->print_cr("Surv Rate Group: %s (" SIZE_FORMAT " entries)",
167 _name, _region_num);
168 for (size_t i = 0; i < _region_num; ++i) {
169 gclog_or_tty->print_cr(" age " SIZE_FORMAT_W(4) " surv rate %6.2lf %% pred %6.2lf %%",
170 i, _surv_rate[i] * 100.0,
171 _predictor->get_new_prediction(_surv_rate_pred[i]) * 100.0);
172 }
173 }
174
175 void
176 SurvRateGroup::print_surv_rate_summary() {
177 size_t length = _summary_surv_rates_max_len;
178 if (length == 0)
179 return;
180
181 gclog_or_tty->cr();
182 gclog_or_tty->print_cr("%s Rate Summary (for up to age " SIZE_FORMAT ")", _name, length-1);
183 gclog_or_tty->print_cr(" age range survival rate (avg) samples (avg)");
184 gclog_or_tty->print_cr(" ---------------------------------------------------------");
185
186 size_t index = 0;
187 size_t limit = MIN2((int) length, 10);
188 while (index < limit) {
189 gclog_or_tty->print_cr(" " SIZE_FORMAT_W(4)
190 " %6.2lf%% %6.2lf",
191 index, _summary_surv_rates[index]->avg() * 100.0,
192 (double) _summary_surv_rates[index]->num());
193 ++index;
194 }
195
196 gclog_or_tty->print_cr(" ---------------------------------------------------------");
197
198 int num = 0;
199 double sum = 0.0;
200 int samples = 0;
201 while (index < length) {
202 ++num;
203 sum += _summary_surv_rates[index]->avg() * 100.0;
204 samples += _summary_surv_rates[index]->num();
205 ++index;
206
207 if (index == length || num % 10 == 0) {
208 gclog_or_tty->print_cr(" " SIZE_FORMAT_W(4) " .. " SIZE_FORMAT_W(4)
209 " %6.2lf%% %6.2lf",
210 (index-1) / 10 * 10, index-1, sum / (double) num,
211 (double) samples / (double) num);
212 sum = 0.0;
213 num = 0;
214 samples = 0;
215 }
216 }
217
218 gclog_or_tty->print_cr(" ---------------------------------------------------------");
219 }
220 #endif // PRODUCT