referencePolicy.cpp revision 0
0N/A/*
0N/A * Copyright 2000-2003 Sun Microsystems, Inc. All Rights Reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
0N/A * published by the Free Software Foundation.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
0N/A *
0N/A * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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0N/A *
0N/A */
0N/A
0N/A# include "incls/_precompiled.incl"
0N/A# include "incls/_referencePolicy.cpp.incl"
0N/A
0N/ALRUCurrentHeapPolicy::LRUCurrentHeapPolicy() {
0N/A _max_interval = (Universe::get_heap_free_at_last_gc() / M) * SoftRefLRUPolicyMSPerMB;
0N/A assert(_max_interval >= 0,"Sanity check");
0N/A}
0N/A
0N/A// The oop passed in is the SoftReference object, and not
0N/A// the object the SoftReference points to.
0N/Abool LRUCurrentHeapPolicy::should_clear_reference(oop p) {
0N/A jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p);
0N/A assert(interval >= 0, "Sanity check");
0N/A
0N/A // The interval will be zero if the ref was accessed since the last scavenge/gc.
0N/A if(interval <= _max_interval) {
0N/A return false;
0N/A }
0N/A
0N/A return true;
0N/A}
0N/A
0N/A/////////////////////// MaxHeap //////////////////////
0N/A
0N/ALRUMaxHeapPolicy::LRUMaxHeapPolicy() {
0N/A size_t max_heap = MaxHeapSize;
0N/A max_heap -= Universe::get_heap_used_at_last_gc();
0N/A max_heap /= M;
0N/A
0N/A _max_interval = max_heap * SoftRefLRUPolicyMSPerMB;
0N/A assert(_max_interval >= 0,"Sanity check");
0N/A}
0N/A
0N/A// The oop passed in is the SoftReference object, and not
0N/A// the object the SoftReference points to.
0N/Abool LRUMaxHeapPolicy::should_clear_reference(oop p) {
0N/A jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p);
0N/A assert(interval >= 0, "Sanity check");
0N/A
0N/A // The interval will be zero if the ref was accessed since the last scavenge/gc.
0N/A if(interval <= _max_interval) {
0N/A return false;
0N/A }
0N/A
0N/A return true;
0N/A}