--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/kernel/eka/memmodel/epoc/flexible/mmu/mthrash.h	Thu Dec 17 09:24:54 2009 +0200
@@ -0,0 +1,78 @@
+// Copyright (c) 2008-2009 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:
+//
+// Description:
+//
+
+
+
+/**
+ @file
+ @internalComponent
+*/
+
+#ifndef MTHRASH_H
+#define MTHRASH_H
+
+class DThrashMonitor
+	{
+public:
+	
+	DThrashMonitor();
+	void Start();
+	TInt ThrashLevel();
+	TInt SetThresholds(TUint thrashing, TUint good);
+
+	void NotifyStartPaging();  			// The current thread has started a paging operation
+	void NotifyEndPaging();    			// The current thread has completed a paging operation
+
+private:
+
+	enum TCount
+		{
+		ECountThreadsPaging,
+		EMaxCount
+		};
+
+	struct TCountData
+		{
+		TInt iCount;					// Current value of counter
+		TUint32 iLastUpdateTime;		// Time counter was last updated
+		TInt64 iTotal;					// Accumulator for ticks * value
+		TInt iAverage;					// Average value of counter for last time period * 100
+		};
+
+private: 
+
+	void UpdateCount(TCount aCount, TInt aDelta);	
+	void RecalculateThrashLevel();		// Update internal state, called periodically from timer DFC
+	static void UpdateDfcFunc(TAny* aPtr);
+
+private:
+
+	TBool iRunning;
+	NTimer iUpdateTimer;
+	TDfc iUpdateDfc;
+	TUint32 iLastUpdateTime;
+	NFastMutex iMutex;
+
+	TInt iThrashLevel;
+	TBool iIsThrashing;
+	TInt iThresholdThrashing;
+	TInt iThresholdGood;
+
+	TCountData iCount[EMaxCount];
+	};
+
+extern DThrashMonitor TheThrashMonitor;
+
+#endif