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Date: Wed, 21 Aug 2002 11:45:06 -0700 (PDT)
From: Mukesh Rajan <mrajan@ics.uci.edu>
To: Richard Zidlicky <rz@linux-m68k.org>
cc: linux-kernel@vger.kernel.org
Subject: Re: detecting hard disk idleness
In-Reply-To: <20020821153917.B1444@linux-m68k.org>
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this again would mean that i would have to poll the /proc/interrupt file.
i want to avoid polling because of very small poll interval causing
overhead. i am still wondering if this could be implemented with some sort
of interrupt mechanism in linux (kernel interrupting user program or user
program waiting on some signal)

- mukesh


On Wed, 21 Aug 2002, Richard Zidlicky wrote:

> 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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