--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/PDK/Source/GUID-95840076-79F2-524B-BAF7-828260BDD923.dita	Tue Mar 30 11:56:28 2010 +0100
@@ -0,0 +1,42 @@
+<?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-95840076-79F2-524B-BAF7-828260BDD923" xml:lang="en"><title>Patchable
+Constants: KHeapShrinkHysRatio</title><prolog><metadata><keywords/></metadata></prolog><conbody>
+<codeblock id="GUID-5053B8C4-B730-5341-98A3-801409460573" xml:space="preserve">EXPORT_C extern const TInt KHeapShrinkHysRatio;</codeblock>
+<table id="GUID-EA923219-CBC1-5F40-9EF3-30EE85C02F76">
+<tgroup cols="2"><colspec colname="col0"/><colspec colname="col1"/>
+<tbody>
+<row>
+<entry><p>Exported from: </p> </entry>
+<entry><p> <filepath>EUSER.DLL</filepath>, <filepath>EKERN.EXE</filepath>  </p> </entry>
+</row>
+<row>
+<entry><p>Defined in: </p> </entry>
+<entry><p> <filepath> .../os/kernelhwsrv/kernel/eka/common/heap.cpp</filepath>  </p> </entry>
+</row>
+<row>
+<entry><p>Purpose: </p> </entry>
+<entry><p>This constant defines the ratio that determines the amount of hysteresis
+between heap growing and heap shrinking. It is a 32-bit fixed point number
+where the radix point is defined to be between bits 7 and 8 (where the LSB
+is bit 0) i.e. using standard notation, a Q8 or a fx24.8 fixed point number.
+For example for a ratio of 2.0 set <codeph>KHeapShrinkHysRatio=0x200</codeph>. </p> <p>The
+heap shrinking hysteresis value is calculated to be: </p> <codeblock id="GUID-1144F94A-6B4C-582D-B1FA-E5852F6BFAA6" xml:space="preserve">KHeapShrinkHysRatio*(iGrowBy&gt;&gt;8)</codeblock> <p>where <codeph>iGrowBy</codeph> is a page aligned value set by the argument, <codeph>aGrowBy</codeph>,
+to the <xref href="GUID-EFAFDD75-7E59-306A-882D-317F5564979E.dita"><apiname>RHeap</apiname></xref> constructor. Default hysteresis value is <codeph>iGrowBy</codeph> bytes
+i.e. <codeph>KHeapShrinkHysRatio=2.0</codeph>. Memory usage may be improved
+by reducing the heap shrinking hysteresis by setting 1.0 &lt; <codeph>KHeapShrinkHysRatio</codeph> &lt;
+2.0. Heap shrinking hysteresis is disabled/removed when <codeph>KHeapShrinkHysRatio</codeph> &lt;=
+1.0. </p> </entry>
+</row>
+</tbody>
+</tgroup>
+</table></conbody></concept>
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