Symbian3/PDK/Source/GUID-CE308C71-D8B2-43B3-97FD-B868285ED5FB.dita
author Dominic Pinkman <dominic.pinkman@nokia.com>
Fri, 13 Aug 2010 16:47:46 +0100
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License 
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"Eclipse Public License v1.0" which accompanies this distribution, 
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors: 
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-CE308C71-D8B2-43B3-97FD-B868285ED5FB" xml:lang="en"><title>OOM
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Monitor Priority</title><shortdesc>This section explains the OOM Monitor priority and the values that
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can be set.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<section id="GUID-950C05B0-1FA9-44D0-90F0-D3AB1EEF4476"><p>To release RAM
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the OOM Monitor uses priorities to determine the order of closing the applications.
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The OOM Monitor assigns priority for each application which determines the
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order (in relation to other applications) of closing the application. </p><p>A
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priority of an application is a measure of impact to the mobile device user
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in case the OOM Monitor closes that application. Thus closing a low priority
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application means that it will have a minimum impact on the user. And closing
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of high priority application will have a high impact on the user.</p><p>The
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OOM Monitor closes the lowest priority application first as this will have
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the smallest impact on the user. It will continue to close the applications
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until the amount of the free RAM is above the <keyword>GOOD_RAM_THRESHOLD</keyword> value.</p><p>If
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two or more applications have the same priority the OOM Monitor closes these
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applications based on their idle time. The application that has stayed idle
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for the longest time will be closed first.</p></section>
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<section id="GUID-0E58AC12-78BD-4FFC-906E-08EBB46CA26C"><title>Priority for
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internal application</title><p> The priority of each internal application
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can be defined in the OOM Monitor configuration file. If the priority of an
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application is not defined it will have the default priority. Default priority
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is also defined in the configuration file. </p><p>The priority of an application
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is not always constant. OOM Monitor configuration file can contain rules that
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determine how the priority is changed for an application when its idle time
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gets longer or when the foreground application is changed. For more information
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on the rules that can be set to change priorities, refer to <xref href="GUID-54D5CBD5-0A1F-4835-B5F3-492728B9F51E.dita">Rules
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to change priority dynamically</xref></p><p/></section>
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<section id="GUID-6D51C8AD-6217-4924-8E55-E5A9459F78A0"><title>Priority for
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third-party application</title><p>Third-party applications can use the following
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priorities:</p><ul>
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<li><p><codeph>Normal</codeph> (default priority)</p></li>
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<li><p><codeph>High</codeph></p></li>
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<li><p><codeph>Busy</codeph> (infinite priority)</p></li>
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</ul><p>By default the priority of a third-party application is <codeph>Normal</codeph> but
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it is possible to change the priority as required. For information on increasing
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the priority of a third-party application, see <xref href="GUID-1E4FFC56-8473-4E0A-B2E2-4E8DE8B1D00F.dita">Increasing
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the Priority of a Third-Party Application</xref></p><p>The OOM Monitor cannot
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close a foreground application. The device user can also define the <codeph>Busy</codeph> priority
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for background applications which means that those applications are never
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closed by the OOM Monitor. For information on how to change the priority of
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an application to <codeph>Busy</codeph>, refer to <xref href="GUID-8F8E3814-7ED6-4218-BEEF-741AE0E9366F.dita">Changing
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the Priority</xref>.</p></section>
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</conbody></concept>