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Date: Sun, 5 Jan 2003 22:17:10 +0100
To: linux-kernel@vger.kernel.org
Subject: Re: 2.5.54-mm3
Message-ID: <20030105211710.GA23827@pusa.informat.uv.es>
References: <3E16A2B6.A741AE17@digeo.com> <20030105180446.GA20388@pusa.informat.uv.es> <3E1897B8.7688566B@digeo.com>
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Thanks for your reply

	Ulisses


On Sun, Jan 05, 2003 at 12:38:16PM -0800, Andrew Morton wrote:
> uaca@alumni.uv.es wrote:
> > 
> > On Sat, Jan 04, 2003 at 01:00:38AM -0800, Andrew Morton wrote:
> > >
> > > http://www.zip.com.au/~akpm/linux/patches/2.5/2.5.54/2.5.54-mm3/
> > 
> > It seems to me that the patch you pointed here doesn't include the latency
> > instrumentation.
> 
> No, it doesn't.  You can monitor the latency using realfeel or realfeel2
> from http://www.zip.com.au/~akpm/linux/amlat.tar.gz
> 
> But that won't tell you _why_ large latencies are occurring.   For that,
> you'll need to apply
> http://www.zip.com.au/~akpm/linux/patches/2.5/2.5.54/2.5.54-mm3/experimental/rtc-debug.patch
> and run `amlat'.  This combination will spit out stack backtraces whenever
> there is a 2 millisecond scheduling overrun.
> 
> > Where it is the needed instrumentation to meassure it?
> > 
> > In http://www.zip.com.au/~akpm/linux/ the are no timepeg/intlat patches for
> > 2.5...
> 
> That's not suitable for this work.  intlat is OK for locating and
> measuring interrupts-off code paths.   But it's a bit hard to drive.
> -
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