Thu, 12 Jun 2008 13:50:55 -0700
Merge
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 2000-2003 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | # include "incls/_precompiled.incl" |
duke@435 | 26 | # include "incls/_referencePolicy.cpp.incl" |
duke@435 | 27 | |
duke@435 | 28 | LRUCurrentHeapPolicy::LRUCurrentHeapPolicy() { |
duke@435 | 29 | _max_interval = (Universe::get_heap_free_at_last_gc() / M) * SoftRefLRUPolicyMSPerMB; |
duke@435 | 30 | assert(_max_interval >= 0,"Sanity check"); |
duke@435 | 31 | } |
duke@435 | 32 | |
duke@435 | 33 | // The oop passed in is the SoftReference object, and not |
duke@435 | 34 | // the object the SoftReference points to. |
duke@435 | 35 | bool LRUCurrentHeapPolicy::should_clear_reference(oop p) { |
duke@435 | 36 | jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p); |
duke@435 | 37 | assert(interval >= 0, "Sanity check"); |
duke@435 | 38 | |
duke@435 | 39 | // The interval will be zero if the ref was accessed since the last scavenge/gc. |
duke@435 | 40 | if(interval <= _max_interval) { |
duke@435 | 41 | return false; |
duke@435 | 42 | } |
duke@435 | 43 | |
duke@435 | 44 | return true; |
duke@435 | 45 | } |
duke@435 | 46 | |
duke@435 | 47 | /////////////////////// MaxHeap ////////////////////// |
duke@435 | 48 | |
duke@435 | 49 | LRUMaxHeapPolicy::LRUMaxHeapPolicy() { |
duke@435 | 50 | size_t max_heap = MaxHeapSize; |
duke@435 | 51 | max_heap -= Universe::get_heap_used_at_last_gc(); |
duke@435 | 52 | max_heap /= M; |
duke@435 | 53 | |
duke@435 | 54 | _max_interval = max_heap * SoftRefLRUPolicyMSPerMB; |
duke@435 | 55 | assert(_max_interval >= 0,"Sanity check"); |
duke@435 | 56 | } |
duke@435 | 57 | |
duke@435 | 58 | // The oop passed in is the SoftReference object, and not |
duke@435 | 59 | // the object the SoftReference points to. |
duke@435 | 60 | bool LRUMaxHeapPolicy::should_clear_reference(oop p) { |
duke@435 | 61 | jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p); |
duke@435 | 62 | assert(interval >= 0, "Sanity check"); |
duke@435 | 63 | |
duke@435 | 64 | // The interval will be zero if the ref was accessed since the last scavenge/gc. |
duke@435 | 65 | if(interval <= _max_interval) { |
duke@435 | 66 | return false; |
duke@435 | 67 | } |
duke@435 | 68 | |
duke@435 | 69 | return true; |
duke@435 | 70 | } |