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Date: Wed, 21 Aug 2002 15:39:17 +0200
From: Richard Zidlicky <rz@linux-m68k.org>
To: Mukesh Rajan <mrajan@ics.uci.edu>
Cc: linux-kernel@vger.kernel.org
Subject: Re: detecting hard disk idleness
Message-ID: <20020821153917.B1444@linux-m68k.org>
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In-Reply-To: <Pine.SOL.4.20.0208202316380.20323-100000@hobbit.ics.uci.edu>; from mrajan@ics.uci.edu on Tue, Aug 20, 2002 at 11:25:11PM -0700
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On Tue, Aug 20, 2002 at 11:25:11PM -0700, Mukesh Rajan wrote:
> hi,
> 
> i'm trying to implement an alogrithm that requires as input the idleness
> period of a hard disk (i.e. time between satisfying a request and arrival
> of new request).
> 
> so far implementation polls "proc/stat" periodically to detect idleness
> over the poll period. this implementation is not accurate and also i have
> very small poll interval (milli secs). with some measurements, conclusion
> is that implementation is consuming quite some power. this millisecond
> polling overhead could be avoided if i can come up with an interrupt
> driven implementation. in DOS, i would have manipulated the interrupt
> table and inserted my code for 13h (disk interrupt right?). this would
> help me do some preprocessing before the actual call to the hard disk
> (13h).
> 
> is this possible in any way in Linux? i.e. have the kernel inform a
> program when a hard disk interrupt occurs? either through interrupt
> manipulation or otherwise?

cat /proc/interrupts

Richard
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