linux-kernel - Re: intel_ips produces constant load of 1

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Message-ID: <20110321110404.6a71a404@jbarnes-desktop>
Date:	Mon, 21 Mar 2011 11:04:04 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Andreas Hartmann <andihartmann@...19freenet.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: intel_ips produces constant load of 1

On Sat, 19 Mar 2011 16:38:38 +0100
Andreas Hartmann <andihartmann@...19freenet.de> wrote:

> Hello,
> 
> on my MSI CR620 laptop, intel_ips produces a constant load of 1, even if
> the machine is idle.
> 
> The ips-monitor hangs in D state:
> 
> ps aux | grep ips
> root       593  0.0  0.0      0     0 ?        S    17:20   0:00
> [ips-adjust]
> root       594  0.0  0.0      0     0 ?        D    17:20   0:00
> [ips-monitor]
> 
> If the module isn't loaded, the load of the machine in idle mode is 0 as
> expected.

This is a reporting problem, and probably due to the schedule() call
and associated task state in the ips-monitor thread.  I thought setting
the task state to interruptible would prevent this, but it seems like
it's not enough for the deferrable on-stack timers?

At any rate, it's not actually causing increased CPU usage, so you can
safely ignore it until we have a fix.

-- 
Jesse Barnes, Intel Open Source Technology Center
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