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comparison src/share/vm/gc_implementation/parallelScavenge/generationSizer.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children 28372612af5e
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2001-2006 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 // There is a nice batch of tested generation sizing code in
26 // TwoGenerationCollectorPolicy. Lets reuse it!
27
28 class GenerationSizer : public TwoGenerationCollectorPolicy {
29 public:
30 GenerationSizer() {
31 // Partial init only!
32 initialize_flags();
33 initialize_size_info();
34 }
35
36 void initialize_flags() {
37 // Do basic sizing work
38 this->TwoGenerationCollectorPolicy::initialize_flags();
39
40 // If the user hasn't explicitly set the number of worker
41 // threads, set the count.
42 if (ParallelGCThreads == 0) {
43 assert(UseParallelGC, "Setting ParallelGCThreads without UseParallelGC");
44 ParallelGCThreads = os::active_processor_count();
45 }
46
47 // The survivor ratio's are calculated "raw", unlike the
48 // default gc, which adds 2 to the ratio value. We need to
49 // make sure the values are valid before using them.
50 if (MinSurvivorRatio < 3) {
51 MinSurvivorRatio = 3;
52 }
53
54 if (InitialSurvivorRatio < 3) {
55 InitialSurvivorRatio = 3;
56 }
57 }
58
59 size_t min_young_gen_size() { return _min_gen0_size; }
60 size_t young_gen_size() { return _initial_gen0_size; }
61 size_t max_young_gen_size() { return _max_gen0_size; }
62
63 size_t min_old_gen_size() { return _min_gen1_size; }
64 size_t old_gen_size() { return _initial_gen1_size; }
65 size_t max_old_gen_size() { return _max_gen1_size; }
66
67 size_t perm_gen_size() { return PermSize; }
68 size_t max_perm_gen_size() { return MaxPermSize; }
69 };