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comparison src/share/vm/gc_implementation/shared/ageTable.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 1997-2003 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 /* Copyright 1992 Sun Microsystems, Inc. and Stanford University.
26 See the LICENSE file for license information. */
27
28 // Age table for adaptive feedback-mediated tenuring (scavenging)
29 //
30 // Note: all sizes are in oops
31
32 class ageTable VALUE_OBJ_CLASS_SPEC {
33 friend class VMStructs;
34
35 public:
36 // constants
37 enum { table_size = markOopDesc::max_age + 1 };
38
39 // instance variables
40 size_t sizes[table_size];
41
42 // constructor. "global" indicates that this is the global age table
43 // (as opposed to gc-thread-local)
44 ageTable(bool global = true);
45
46 // clear table
47 void clear();
48
49 // add entry
50 void add(oop p, size_t oop_size) {
51 int age = p->age();
52 assert(age > 0 && age < table_size, "invalid age of object");
53 sizes[age] += oop_size;
54 }
55
56 // Merge another age table with the current one. Used
57 // for parallel young generation gc.
58 void merge(ageTable* subTable);
59
60 // calculate new tenuring threshold based on age information
61 int compute_tenuring_threshold(size_t survivor_capacity);
62
63 private:
64 PerfVariable* _perf_sizes[table_size];
65 };