linux-kernel - Re: Re: Re: [REGRESSION] [Linux 3.2] top/htop and all other CPU usage

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Message-ID: <20111129131042.GC4043@tiehlicka.suse.cz>
Date:	Tue, 29 Nov 2011 14:10:42 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	"Artem S. Tashkinov" <t.artem@...os.com>
Cc:	pomac@...or.com, linux-kernel@...r.kernel.org, rjw@...k.pl,
	tino.keitel@...ei.de
Subject: Re: Re: Re: [REGRESSION] [Linux 3.2] top/htop and all other CPU usage

On Tue 29-11-11 12:54:16, Artem S. Tashkinov wrote:
> > On Nov 29, 2011, Michal Hocko  wrote: 
> > 
> > On Tue 29-11-11 13:31:56, Michal Hocko wrote:
> > > On Tue 29-11-11 11:38:47, Artem S. Tashkinov wrote:
> > [...]
> > > > $ grep . -r /sys/devices/system/cpu/cpuidle/
> > > > /sys/devices/system/cpu/cpuidle/current_driver:intel_idle
> > > > /sys/devices/system/cpu/cpuidle/current_governor_ro:menu
> > 
> > Could you try with acpi_idle driver?
> > echo acpi_idle > /sys/devices/system/cpu/cpuidle/current_driver
> 
> [root@...alhost ~]# echo acpi_idle > /sys/devices/system/cpu/cpuidle/current_driver
> -bash: /sys/devices/system/cpu/cpuidle/current_driver: Permission denied

It seems that this is cannot be set in runtime:
SYSDEV_CLASS_ATTR(current_driver, 0444, show_current_driver, NULL);

Or maybe you need to boot with cpuidle_sysfs_switch. According to the
documentation you might be able to change the governor. I have no idea
whether this can help somehow but let's try that.

I haven't found any intel_idle machine in my lab so far and all other
acpi_idle machines seem to work (or at least randomly selected ones) so
this smells like a major difference in the setup.

-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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