Mon, 01 Dec 2008 23:25:24 -0800
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
Summary: Renamed Reference{Policy,Pocessor} methods from snap{,_policy}() to setup{,_policy}()
Reviewed-by: apetrusenko
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
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23 */
25 # include "incls/_precompiled.incl"
26 # include "incls/_referencePolicy.cpp.incl"
28 LRUCurrentHeapPolicy::LRUCurrentHeapPolicy() {
29 setup();
30 }
32 // Capture state (of-the-VM) information needed to evaluate the policy
33 void LRUCurrentHeapPolicy::setup() {
34 _max_interval = (Universe::get_heap_free_at_last_gc() / M) * SoftRefLRUPolicyMSPerMB;
35 assert(_max_interval >= 0,"Sanity check");
36 }
38 // The oop passed in is the SoftReference object, and not
39 // the object the SoftReference points to.
40 bool LRUCurrentHeapPolicy::should_clear_reference(oop p) {
41 jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p);
42 assert(interval >= 0, "Sanity check");
44 // The interval will be zero if the ref was accessed since the last scavenge/gc.
45 if(interval <= _max_interval) {
46 return false;
47 }
49 return true;
50 }
52 /////////////////////// MaxHeap //////////////////////
54 LRUMaxHeapPolicy::LRUMaxHeapPolicy() {
55 setup();
56 }
58 // Capture state (of-the-VM) information needed to evaluate the policy
59 void LRUMaxHeapPolicy::setup() {
60 size_t max_heap = MaxHeapSize;
61 max_heap -= Universe::get_heap_used_at_last_gc();
62 max_heap /= M;
64 _max_interval = max_heap * SoftRefLRUPolicyMSPerMB;
65 assert(_max_interval >= 0,"Sanity check");
66 }
68 // The oop passed in is the SoftReference object, and not
69 // the object the SoftReference points to.
70 bool LRUMaxHeapPolicy::should_clear_reference(oop p) {
71 jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p);
72 assert(interval >= 0, "Sanity check");
74 // The interval will be zero if the ref was accessed since the last scavenge/gc.
75 if(interval <= _max_interval) {
76 return false;
77 }
79 return true;
80 }