0N/A/*
2828N/A * Copyright (c) 2000, 2011, Oracle and/or its affiliates. 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 *
1472N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1472N/A * or visit www.oracle.com if you need additional information or have any
1472N/A * questions.
0N/A *
0N/A */
0N/A
1879N/A#include "precompiled.hpp"
1879N/A#include "classfile/javaClasses.hpp"
1879N/A#include "memory/referencePolicy.hpp"
1879N/A#include "memory/universe.hpp"
1879N/A#include "runtime/arguments.hpp"
1879N/A#include "runtime/globals.hpp"
0N/A
0N/ALRUCurrentHeapPolicy::LRUCurrentHeapPolicy() {
457N/A setup();
453N/A}
453N/A
453N/A// Capture state (of-the-VM) information needed to evaluate the policy
457N/Avoid LRUCurrentHeapPolicy::setup() {
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.
2828N/Abool LRUCurrentHeapPolicy::should_clear_reference(oop p,
2828N/A jlong timestamp_clock) {
2828N/A jlong interval = timestamp_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() {
457N/A setup();
453N/A}
453N/A
453N/A// Capture state (of-the-VM) information needed to evaluate the policy
457N/Avoid LRUMaxHeapPolicy::setup() {
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.
2828N/Abool LRUMaxHeapPolicy::should_clear_reference(oop p,
2828N/A jlong timestamp_clock) {
2828N/A jlong interval = timestamp_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}