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comparison src/share/vm/memory/referencePolicy.cpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c96030fff130
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2000-2003 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 # include "incls/_precompiled.incl"
26 # include "incls/_referencePolicy.cpp.incl"
27
28 LRUCurrentHeapPolicy::LRUCurrentHeapPolicy() {
29 _max_interval = (Universe::get_heap_free_at_last_gc() / M) * SoftRefLRUPolicyMSPerMB;
30 assert(_max_interval >= 0,"Sanity check");
31 }
32
33 // The oop passed in is the SoftReference object, and not
34 // the object the SoftReference points to.
35 bool LRUCurrentHeapPolicy::should_clear_reference(oop p) {
36 jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p);
37 assert(interval >= 0, "Sanity check");
38
39 // The interval will be zero if the ref was accessed since the last scavenge/gc.
40 if(interval <= _max_interval) {
41 return false;
42 }
43
44 return true;
45 }
46
47 /////////////////////// MaxHeap //////////////////////
48
49 LRUMaxHeapPolicy::LRUMaxHeapPolicy() {
50 size_t max_heap = MaxHeapSize;
51 max_heap -= Universe::get_heap_used_at_last_gc();
52 max_heap /= M;
53
54 _max_interval = max_heap * SoftRefLRUPolicyMSPerMB;
55 assert(_max_interval >= 0,"Sanity check");
56 }
57
58 // The oop passed in is the SoftReference object, and not
59 // the object the SoftReference points to.
60 bool LRUMaxHeapPolicy::should_clear_reference(oop p) {
61 jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p);
62 assert(interval >= 0, "Sanity check");
63
64 // The interval will be zero if the ref was accessed since the last scavenge/gc.
65 if(interval <= _max_interval) {
66 return false;
67 }
68
69 return true;
70 }