diff -r ae94777fff8f -r 59758314f811 Symbian3/PDK/Source/GUID-44540C74-CD73-5D8E-A9E0-F90F46B4E7B1-GENID-1-10-1-15-1-1-7-1-1-5-1-8-1-11-1-7-1-4-1-4-1.dita
--- a/Symbian3/PDK/Source/GUID-44540C74-CD73-5D8E-A9E0-F90F46B4E7B1-GENID-1-10-1-15-1-1-7-1-1-5-1-8-1-11-1-7-1-4-1-4-1.dita	Fri Jun 11 12:39:03 2010 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,54 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
-<!-- This component and the accompanying materials are made available under the terms of the License 
-"Eclipse Public License v1.0" which accompanies this distribution, 
-and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
-<!-- Initial Contributors:
-    Nokia Corporation - initial contribution.
-Contributors: 
--->
-<!DOCTYPE concept
-  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
-<concept id="GUID-44540C74-CD73-5D8E-A9E0-F90F46B4E7B1-GENID-1-10-1-15-1-1-7-1-1-5-1-8-1-11-1-7-1-4-1-4-1" xml:lang="en"><title>Preventing
-And Recovering From Thrashing Tutorial</title><shortdesc>Describes how to reduce the chance of thrashing occurring in demand
-memory and how to recover from thrashing. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
-<section id="GUID-B9C385CD-A155-52F9-9001-C219A9AD52DB-GENID-1-10-1-15-1-1-7-1-1-5-1-8-1-11-1-7-1-4-1-4-1-3-1"><title>Introduction</title> <p>Thrashing
-is a state where the vast majority of the processing time is spent paging
-memory in and out of the system and very little is spent useful work. If this
-situation persists, then the system performance rapidly becomes unacceptable
-and will appear to the user to have hung. </p> </section>
-<section id="GUID-D93027E5-EC83-431B-872C-17F81F5FD64B-GENID-1-10-1-15-1-1-7-1-1-5-1-8-1-11-1-7-1-4-1-4-1-3-2"><title>Background information</title><p>The following is useful background
-reading: </p><ul>
-<li><p> Thrashing </p></li>
-</ul> </section>
-<section id="GUID-6EAA97DD-B352-4C40-9A41-4F60F2A34A8B-GENID-1-10-1-15-1-1-7-1-1-5-1-8-1-11-1-7-1-4-1-4-1-3-3"><title>Thrashing features</title><p>When thrashing occurs the device
-will appear to do nothing or 'hang' for  period. Unlike a deadlock however,
-the device can recover from thrashing.</p> </section>
-<section id="GUID-6355035F-BBE3-4D33-8B02-76BA7B40AA0B-GENID-1-10-1-15-1-1-7-1-1-5-1-8-1-11-1-7-1-4-1-4-1-3-4"><title>Prevention of thrashing</title><p>The following can be used
-reduce the chance of thrashing: </p><ul>
-<li><p>Compress pages in memory to decrease the amount of memory that has
-to  be paged in and out </p></li>
-<li><p>Limit the maximum size of each process's paged memory to the minimum
-size of the paging cache </p></li>
-<li><p>Partition the page cache per-process and allocate pages to processes
- based on the Working Set Size (WSS) of threads in that process</p></li>
-<li><p>Swap out the oldest pages in advance to free up memory to cope with
-spikes in paging demand</p></li>
-<li><p>Don't let threads steal pages from other threads </p></li>
-</ul> </section>
-<section id="GUID-5E119B58-E5C5-49AD-95B3-76DDDD4AF0CD-GENID-1-10-1-15-1-1-7-1-1-5-1-8-1-11-1-7-1-4-1-4-1-3-5"><title>Recovery from thrashing</title> <p>The possible courses of
-action to undertake, should thrashing occur, are : </p> <ul>
-<li id="GUID-50BE3032-DE49-575A-B2A8-20D12F387C86-GENID-1-10-1-15-1-1-7-1-1-5-1-8-1-11-1-7-1-4-1-4-1-3-5-3-1"><p>Reboot the device </p> </li>
-<li id="GUID-DFB20955-70DA-5403-BFDD-D45B50926E98-GENID-1-10-1-15-1-1-7-1-1-5-1-8-1-11-1-7-1-4-1-4-1-3-5-3-2"><p>Kill a thread </p> </li>
-<li id="GUID-DF970B70-A9BA-5532-A267-5920950F6F2A-GENID-1-10-1-15-1-1-7-1-1-5-1-8-1-11-1-7-1-4-1-4-1-3-5-3-3"><p>Decrease the number
-of paged threads running concurrently </p> </li>
-<li id="GUID-B849006B-66E7-5F31-8225-297235614AC4-GENID-1-10-1-15-1-1-7-1-1-5-1-8-1-11-1-7-1-4-1-4-1-3-5-3-4"><p>Pick one thread with
-a high page fault rate and stop other threads stealing pages from the thread's
-associated process </p> </li>
-<li id="GUID-0497BC30-7BCA-5E69-A835-722C80EA2680-GENID-1-10-1-15-1-1-7-1-1-5-1-8-1-11-1-7-1-4-1-4-1-3-5-3-5"><p>Prompt the user-side
-memory manager to close down applications. </p> </li>
-</ul> </section>
-</conbody><related-links>
-<link href="GUID-ACB79CEF-CA4D-5C96-AFCD-6AD7C7C26C53.dita"><linktext>Thrashing
-guide</linktext></link>
-</related-links></concept>
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