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To: "Rafael J. Wysocki" <rjw@sisk.pl>
cc: "Martin J. Bligh" <mbligh@aracnet.com>, Con Kolivas <kernel@kolivas.org>,
       Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: 2.6.9-rc1-mm1 
In-reply-to: Your message of "Fri, 27 Aug 2004 22:54:58 +0200."
             <200408272254.58646.rjw@sisk.pl> 
Date: Fri, 27 Aug 2004 14:54:18 -0700
From: Rick Lindsley <ricklind@us.ibm.com>
Sender: linux-kernel-owner@vger.kernel.org
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    > Rafael, what baseline release are you comparing to?  I should be able
    > to provide some tools to measure the effect on updatedb directly for
    > both 2.6.9-rc1 and your baseline (so long as it's 2.6-based)
    
    2.6.8.1, for example.  I'd like to compate it with the 2.6.9-rc1-mm1, which 
    contains the Nick's scheduler (2.6.9-rc1 has the same scheduler as 2.6.8.1, 
    AFAIK).

Okay.  A schedstats patch for 2.6.8.1 is available at

    http://eaglet.rain.com/rick/linux/schedstat/patches/schedstat-2.6.8.1
    or
    http://oss.software.ibm.com/linux/patches/?patch_id=730

You can also pick up the program "latency.c" at

    http://eaglet.rain.com/rick/linux/schedstat/v9/latency.c

With these two things in hand, you should be able to measure the latency
on 2.6.8.1 of a particular process.

A patch is not necessary for 2.6.9-rc1-mm1 (schedstats is already in there)
but you will need to config the kernel to use it.  Then retrieve a slightly
different latency.c:
    
    http://eaglet.rain.com/rick/linux/schedstat/v10/latency.c

since 2.6.9-rc1-mm1 output format is different (as you noted, it's a
different scheduler.)  Then you should be able to see if the latency of
a particular process (updatedb, for instance) changes.

Rick