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

[Greg KH <gregkh@suse.de>]

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

<snip>

> Author: Peter Zijlstra <a.p.zijlstra@chello.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@chello.nl>
>     Acked-by: Chase Douglas <chase.douglas@canonical.com>
>     LKML-Reference: <1271934490.1776.343.camel@laptop>
>     Signed-off-by: Ingo Molnar <mingo@elte.hu>

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

thanks,

greg k-h