duke@435: /*
xdono@905:  * Copyright 2000-2008 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: # include "incls/_precompiled.incl"
duke@435: # include "incls/_referencePolicy.cpp.incl"
duke@435: 
duke@435: LRUCurrentHeapPolicy::LRUCurrentHeapPolicy() {
ysr@892:   setup();
ysr@888: }
ysr@888: 
ysr@888: // Capture state (of-the-VM) information needed to evaluate the policy
ysr@892: void LRUCurrentHeapPolicy::setup() {
duke@435:   _max_interval = (Universe::get_heap_free_at_last_gc() / M) * SoftRefLRUPolicyMSPerMB;
duke@435:   assert(_max_interval >= 0,"Sanity check");
duke@435: }
duke@435: 
duke@435: // The oop passed in is the SoftReference object, and not
duke@435: // the object the SoftReference points to.
duke@435: bool LRUCurrentHeapPolicy::should_clear_reference(oop p) {
duke@435:   jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p);
duke@435:   assert(interval >= 0, "Sanity check");
duke@435: 
duke@435:   // The interval will be zero if the ref was accessed since the last scavenge/gc.
duke@435:   if(interval <= _max_interval) {
duke@435:     return false;
duke@435:   }
duke@435: 
duke@435:   return true;
duke@435: }
duke@435: 
duke@435: /////////////////////// MaxHeap //////////////////////
duke@435: 
duke@435: LRUMaxHeapPolicy::LRUMaxHeapPolicy() {
ysr@892:   setup();
ysr@888: }
ysr@888: 
ysr@888: // Capture state (of-the-VM) information needed to evaluate the policy
ysr@892: void LRUMaxHeapPolicy::setup() {
duke@435:   size_t max_heap = MaxHeapSize;
duke@435:   max_heap -= Universe::get_heap_used_at_last_gc();
duke@435:   max_heap /= M;
duke@435: 
duke@435:   _max_interval = max_heap * SoftRefLRUPolicyMSPerMB;
duke@435:   assert(_max_interval >= 0,"Sanity check");
duke@435: }
duke@435: 
duke@435: // The oop passed in is the SoftReference object, and not
duke@435: // the object the SoftReference points to.
duke@435: bool LRUMaxHeapPolicy::should_clear_reference(oop p) {
duke@435:   jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p);
duke@435:   assert(interval >= 0, "Sanity check");
duke@435: 
duke@435:   // The interval will be zero if the ref was accessed since the last scavenge/gc.
duke@435:   if(interval <= _max_interval) {
duke@435:     return false;
duke@435:   }
duke@435: 
duke@435:   return true;
duke@435: }