linux-kernel - Re: PROBLEM: Unusually high load average when idle in 2.6.35, 2.6.35.1 and later

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Message-ID: <20101001180923.GB9353@suse.de>
Date:	Fri, 1 Oct 2010 11:09:23 -0700
From:	Greg KH <gregkh@...e.de>
To:	tmhikaru@...il.com
Cc:	Florian Mickler <florian@...kler.org>, linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: Unusually high load average when idle in 2.6.35,
 2.6.35.1 and later

On Thu, Sep 30, 2010 at 11:53:21PM -0400, tmhikaru@...il.com wrote:

<snip>

> Author: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Date:   Thu Apr 22 21:50:19 2010 +0200
> 
>     sched: Cure load average vs NO_HZ woes
> 
>     Chase reported that due to us decrementing calc_load_task prematurely
>     (before the next LOAD_FREQ sample), the load average could be scewed
>     by as much as the number of CPUs in the machine.
> 
>     This patch, based on Chase's patch, cures the problem by keeping the
>     delta of the CPU going into NO_HZ idle separately and folding that in
>     on the next LOAD_FREQ update.
> 
>     This restores the balance and we get strict LOAD_FREQ period samples.
> 
>     Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
>     Acked-by: Chase Douglas <chase.douglas@...onical.com>
>     LKML-Reference: <1271934490.1776.343.camel@...top>
>     Signed-off-by: Ingo Molnar <mingo@...e.hu>

Care to resend this and cc: Peter, Chase, and Ingo?

thanks,

greg k-h
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