1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/kernelhwsrv/kernel/eka/memmodel/epoc/flexible/mmu/mthrash.h	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,78 @@
     1.4 +// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
     1.5 +// All rights reserved.
     1.6 +// This component and the accompanying materials are made available
     1.7 +// under the terms of the License "Eclipse Public License v1.0"
     1.8 +// which accompanies this distribution, and is available
     1.9 +// at the URL "http://www.eclipse.org/legal/epl-v10.html".
    1.10 +//
    1.11 +// Initial Contributors:
    1.12 +// Nokia Corporation - initial contribution.
    1.13 +//
    1.14 +// Contributors:
    1.15 +//
    1.16 +// Description:
    1.17 +//
    1.18 +
    1.19 +
    1.20 +
    1.21 +/**
    1.22 + @file
    1.23 + @internalComponent
    1.24 +*/
    1.25 +
    1.26 +#ifndef MTHRASH_H
    1.27 +#define MTHRASH_H
    1.28 +
    1.29 +class DThrashMonitor
    1.30 +	{
    1.31 +public:
    1.32 +	
    1.33 +	DThrashMonitor();
    1.34 +	void Start();
    1.35 +	TInt ThrashLevel();
    1.36 +	TInt SetThresholds(TUint thrashing, TUint good);
    1.37 +
    1.38 +	void NotifyStartPaging();  			// The current thread has started a paging operation
    1.39 +	void NotifyEndPaging();    			// The current thread has completed a paging operation
    1.40 +
    1.41 +private:
    1.42 +
    1.43 +	enum TCount
    1.44 +		{
    1.45 +		ECountThreadsPaging,
    1.46 +		EMaxCount
    1.47 +		};
    1.48 +
    1.49 +	struct TCountData
    1.50 +		{
    1.51 +		TInt iCount;					// Current value of counter
    1.52 +		TUint32 iLastUpdateTime;		// Time counter was last updated
    1.53 +		TInt64 iTotal;					// Accumulator for ticks * value
    1.54 +		TInt iAverage;					// Average value of counter for last time period * 100
    1.55 +		};
    1.56 +
    1.57 +private: 
    1.58 +
    1.59 +	void UpdateCount(TCount aCount, TInt aDelta);	
    1.60 +	void RecalculateThrashLevel();		// Update internal state, called periodically from timer DFC
    1.61 +	static void UpdateDfcFunc(TAny* aPtr);
    1.62 +
    1.63 +private:
    1.64 +
    1.65 +	TBool iRunning;
    1.66 +	NTimer iUpdateTimer;
    1.67 +	TDfc iUpdateDfc;
    1.68 +	TUint32 iLastUpdateTime;
    1.69 +	NFastMutex iMutex;
    1.70 +
    1.71 +	TInt iThrashLevel;
    1.72 +	TBool iIsThrashing;
    1.73 +	TInt iThresholdThrashing;
    1.74 +	TInt iThresholdGood;
    1.75 +
    1.76 +	TCountData iCount[EMaxCount];
    1.77 +	};
    1.78 +
    1.79 +extern DThrashMonitor TheThrashMonitor;
    1.80 +
    1.81 +#endif