From: Greg KH <gregkh@suse.de>
To: tmhikaru@gmail.com
Cc: Florian Mickler <florian@mickler.org>, linux-kernel@vger.kernel.org
Subject: Re: PROBLEM: Unusually high load average when idle in 2.6.35, 2.6.35.1 and later
Date: Fri, 1 Oct 2010 11:09:23 -0700 [thread overview]
Message-ID: <20101001180923.GB9353@suse.de> (raw)
In-Reply-To: <20101001035321.GA2360@roll>
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
prev parent reply other threads:[~2010-10-01 18:42 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-01 3:53 PROBLEM: Unusually high load average when idle in 2.6.35, 2.6.35.1 and later tmhikaru
2010-10-01 9:48 ` tmhikaru
2010-10-03 3:02 ` tmhikaru
2010-10-03 8:41 ` Peter Zijlstra
2010-10-03 10:12 ` Florian Mickler
2010-10-03 12:04 ` Peter Zijlstra
2010-10-03 17:18 ` tmhikaru
2010-10-11 1:09 ` tmhikaru
2010-10-03 10:21 ` Florian Mickler
2010-10-03 17:10 ` tmhikaru
2010-10-01 18:09 ` Greg KH [this message]
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