0
|
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 }
|