| /* |
| * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "classfile/javaClasses.hpp" |
| #include "memory/referencePolicy.hpp" |
| #include "memory/universe.hpp" |
| #include "runtime/arguments.hpp" |
| #include "runtime/globals.hpp" |
| |
| LRUCurrentHeapPolicy::LRUCurrentHeapPolicy() { |
| setup(); |
| } |
| |
| // Capture state (of-the-VM) information needed to evaluate the policy |
| void LRUCurrentHeapPolicy::setup() { |
| _max_interval = (Universe::get_heap_free_at_last_gc() / M) * SoftRefLRUPolicyMSPerMB; |
| assert(_max_interval >= 0,"Sanity check"); |
| } |
| |
| // The oop passed in is the SoftReference object, and not |
| // the object the SoftReference points to. |
| bool LRUCurrentHeapPolicy::should_clear_reference(oop p) { |
| jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p); |
| assert(interval >= 0, "Sanity check"); |
| |
| // The interval will be zero if the ref was accessed since the last scavenge/gc. |
| if(interval <= _max_interval) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| /////////////////////// MaxHeap ////////////////////// |
| |
| LRUMaxHeapPolicy::LRUMaxHeapPolicy() { |
| setup(); |
| } |
| |
| // Capture state (of-the-VM) information needed to evaluate the policy |
| void LRUMaxHeapPolicy::setup() { |
| size_t max_heap = MaxHeapSize; |
| max_heap -= Universe::get_heap_used_at_last_gc(); |
| max_heap /= M; |
| |
| _max_interval = max_heap * SoftRefLRUPolicyMSPerMB; |
| assert(_max_interval >= 0,"Sanity check"); |
| } |
| |
| // The oop passed in is the SoftReference object, and not |
| // the object the SoftReference points to. |
| bool LRUMaxHeapPolicy::should_clear_reference(oop p) { |
| jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p); |
| assert(interval >= 0, "Sanity check"); |
| |
| // The interval will be zero if the ref was accessed since the last scavenge/gc. |
| if(interval <= _max_interval) { |
| return false; |
| } |
| |
| return true; |
| } |