1 /*
2 * Copyright (c) 2002, 2012, 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_implementation/shared/gcUtil.hpp"
27
28 // Catch-all file for utility classes
29
30 float AdaptiveWeightedAverage::compute_adaptive_average(float new_sample,
31 float average) {
32 // We smooth the samples by not using weight() directly until we've
33 // had enough data to make it meaningful. We'd like the first weight
34 // used to be 1, the second to be 1/2, etc until we have
35 // OLD_THRESHOLD/weight samples.
36 unsigned count_weight = 0;
37
38 // Avoid division by zero if the counter wraps (7158457)
39 if (!is_old()) {
40 count_weight = OLD_THRESHOLD/count();
41 }
42
43 unsigned adaptive_weight = (MAX2(weight(), count_weight));
44
45 float new_avg = exp_avg(average, new_sample, adaptive_weight);
46
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1 /*
2 * Copyright (c) 2002, 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/shared/gcUtil.hpp"
27
28 // Catch-all file for utility classes
29
30 float AdaptiveWeightedAverage::compute_adaptive_average(float new_sample,
31 float average) {
32 // We smooth the samples by not using weight() directly until we've
33 // had enough data to make it meaningful. We'd like the first weight
34 // used to be 1, the second to be 1/2, etc until we have
35 // OLD_THRESHOLD/weight samples.
36 unsigned count_weight = 0;
37
38 // Avoid division by zero if the counter wraps (7158457)
39 if (!is_old()) {
40 count_weight = OLD_THRESHOLD/count();
41 }
42
43 unsigned adaptive_weight = (MAX2(weight(), count_weight));
44
45 float new_avg = exp_avg(average, new_sample, adaptive_weight);
46
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