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Date: Wed, 27 Jul 2005 23:56:25 -0700
From: Andrew Morton <akpm@osdl.org>
To: Florian Engelhardt <flo@dotbox.org>
Cc: linux-kernel@vger.kernel.org, acpi-devel@lists.sourceforge.net
Subject: Re: system freezes for 0.2 to 0.5 seconds when reading
 /proc/acpi/thermal_zone/THRM/temperature
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Florian Engelhardt <flo@dotbox.org> wrote:
>
> Hello,
> 
> On Wed, 27 Jul 2005 16:16:05 -0700
> Andrew Morton <akpm@osdl.org> wrote:
> 
> > Florian Engelhardt <flo@dotbox.org> wrote:
> > >
> > > Hello,
> > > 
> > > first of all, sorry for the long headline.
> > > second:
> > > Every time, i try to do the following:
> > > cat /proc/acpi/thermal_zone/THRM/temperature
> > > the whole system looks up for a short period of time (something
> > > about 0.5s). realy everything, video and audio encoding, mouse and
> > > keyboard input, firefox playing a flash animation, ...
> > > I am also getting the following:
> > > Losing some ticks... checking if CPU frequency changed.
> > > 
> > > maybe these two things are belonging to each other.
> > > 
> > > I am using a 2.6.12-rc3-mm1 kernel on a amd64 with a nvidia nforce4
> > > mainboard.
> > 
> > It might help if you were to generate a kernel profile:
> > 
> > readprofile -r
> 
> returns:
> /proc/profile: No such file or directory
> 
> do i have to activate something special during kernel configuration?

Set CONFIG_PROFILING=y

> btw: i saw that mm2 is available. Are there any changes in it, which
> could solve this problem?

Well there's a huge ACPI patch in there, but I cannot say whether it
addresses this problem.