author | stefank |
Mon, 21 Feb 2011 11:26:45 +0100 | |
changeset 8337 | ccb1f3acfe94 |
parent 7397 | 5b173b4ca846 |
child 10683 | 4b5a5a507864 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "classfile/javaClasses.hpp" |
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#include "memory/referencePolicy.hpp" |
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#include "memory/universe.hpp" |
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#include "runtime/arguments.hpp" |
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#include "runtime/globals.hpp" |
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LRUCurrentHeapPolicy::LRUCurrentHeapPolicy() { |
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setup(); |
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} |
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// Capture state (of-the-VM) information needed to evaluate the policy |
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void LRUCurrentHeapPolicy::setup() { |
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_max_interval = (Universe::get_heap_free_at_last_gc() / M) * SoftRefLRUPolicyMSPerMB; |
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assert(_max_interval >= 0,"Sanity check"); |
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} |
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// The oop passed in is the SoftReference object, and not |
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// the object the SoftReference points to. |
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bool LRUCurrentHeapPolicy::should_clear_reference(oop p) { |
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jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p); |
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assert(interval >= 0, "Sanity check"); |
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// The interval will be zero if the ref was accessed since the last scavenge/gc. |
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if(interval <= _max_interval) { |
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return false; |
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} |
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return true; |
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} |
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/////////////////////// MaxHeap ////////////////////// |
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LRUMaxHeapPolicy::LRUMaxHeapPolicy() { |
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setup(); |
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} |
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// Capture state (of-the-VM) information needed to evaluate the policy |
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void LRUMaxHeapPolicy::setup() { |
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size_t max_heap = MaxHeapSize; |
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max_heap -= Universe::get_heap_used_at_last_gc(); |
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max_heap /= M; |
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_max_interval = max_heap * SoftRefLRUPolicyMSPerMB; |
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assert(_max_interval >= 0,"Sanity check"); |
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} |
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// The oop passed in is the SoftReference object, and not |
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// the object the SoftReference points to. |
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bool LRUMaxHeapPolicy::should_clear_reference(oop p) { |
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jlong interval = java_lang_ref_SoftReference::clock() - java_lang_ref_SoftReference::timestamp(p); |
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assert(interval >= 0, "Sanity check"); |
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// The interval will be zero if the ref was accessed since the last scavenge/gc. |
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if(interval <= _max_interval) { |
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return false; |
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} |
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return true; |
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} |