1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/kernelhwsrv/userlibandfileserver/fileserver/sfile/sf_file_cache_defs.h	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,67 @@
     1.4 +// Copyright (c) 2006-2009 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 +// f32\sfile\sf_file_cache_defs.h
    1.18 +// This file contains default settings for file caching. 
    1.19 +// Some of these settings may be overriden by appropriate entries in the estart.txt file
    1.20 +// Sizes / lengths specified in kilobytes, timeouts in miliseconds
    1.21 +// 
    1.22 +//
    1.23 +
    1.24 +/**
    1.25 + @file
    1.26 + @internalTechnology
    1.27 +*/
    1.28 +
    1.29 +
    1.30 +// Global file-cache settings 
    1.31 +const TBool KDefaultGlobalCacheEnabled			= ETrue; 
    1.32 +const TInt KDefaultGlobalCacheSize				= (32*1024);	// 32768 K = 32 MBytes - the maximum for all files
    1.33 +// The maximum amount of locked data allowed for all files
    1.34 +const TInt KDefaultGlobalCacheMaxLockedSize	= (1*1024);		// 1 Mb maximum locked data
    1.35 +// Low memory threshold as a percentage of total RAM.
    1.36 +// If the amount of RAM drops below this value, attempts to allocate memory for a file caching will fail
    1.37 +const TInt KDefaultLowMemoryThreshold			= 10;			// 10 % of total RAM
    1.38 +
    1.39 +// per-drive file-cache settings. 
    1.40 +const TInt KDefaultFileCacheMaxReadAheadLen	= (128);	// 128K	// NB non-configurable by estart
    1.41 +const TInt KDefaultFileCacheSize				= (256);	// 256K
    1.42 +const TInt KDefaultFairSchedulingLen			= (128);	// 128K
    1.43 +
    1.44 +
    1.45 +enum {EFileCacheFlagOff, EFileCacheFlagEnabled, EFileCacheFlagOn};
    1.46 +
    1.47 +// default drive cache settings - these may be overridden by estart.txt settings or file open mode 
    1.48 +
    1.49 +const TInt KDefaultFileCacheRead				= EFileCacheFlagEnabled;
    1.50 +const TInt KDefaultFileCacheReadAhead			= EFileCacheFlagOn;		// NB only enabled if read caching also enabled
    1.51 +const TInt KDefaultFileCacheWrite				= EFileCacheFlagEnabled;
    1.52 +
    1.53 +/**
    1.54 +If set to ETrue, media driver reads on this drive are considered to be asynchronous 
    1.55 +i.e. interrupt driven. This results in read-aheads being issued before completing a client read request.
    1.56 +
    1.57 +If set to EFalse, media driver reads on this drive are considered to be synchronous 
    1.58 +i.e. issuing a read-ahead is likely to block any client thread which will normally be running at
    1.59 +lower priority than the media driver's thread. In this case read-aheads only happen during periods 
    1.60 +of inactivity so as to improve latency: this is achieved by lowering the process of the drive thread
    1.61 +if there is only one read-ahead request in the drive thread's queue.
    1.62 +*/
    1.63 +const TInt KDefaultFileCacheReadAsync			= ETrue;
    1.64 + 
    1.65 +// time after which a file will be removed from closed file queue
    1.66 +const TInt KDefaultClosedFileKeepAliveTime = 3000;			// 3,000 ms = 3 seconds
    1.67 +
    1.68 +// time after which a file containing dirty data will be flushed
    1.69 +const TInt KDefaultDirtyDataFlushTime = 3000;				// 3,000 ms = 3 seconds
    1.70 +