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

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Message-ID: <20110323112006.6a2d975b@jbarnes-desktop>
Date:	Wed, 23 Mar 2011 11:20:06 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Andreas Hartmann <andihartmann@...enet.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: intel_ips produces constant load of 1

On Wed, 23 Mar 2011 19:15:57 +0100
Andreas Hartmann <andihartmann@...enet.de> wrote:

> Jesse Barnes wrote:
> > On Mon, 21 Mar 2011 11:04:04 -0700
> > Jesse Barnes <jbarnes@...tuousgeek.org> wrote:
> > 
> >>> 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.
> > 
> > Oops, one task uses interruptible correctly, but the monitor thread
> > doesn't.
> > 
> > Does this patch fix your load average?
> 
> Which patch? I can't see any patch :-).
> 

Did I forget to paste it?  See below.

-- 
Jesse Barnes, Intel Open Source Technology Center

diff --git a/drivers/platform/x86/intel_ips.c b/drivers/platform/x86/intel_ips.c
index 1294a39..85c8ad4 100644
--- a/drivers/platform/x86/intel_ips.c
+++ b/drivers/platform/x86/intel_ips.c
@@ -1111,7 +1111,7 @@ static int ips_monitor(void *data)
                last_msecs = jiffies_to_msecs(jiffies);
                expire = jiffies + msecs_to_jiffies(IPS_SAMPLE_PERIOD);
 
-               __set_current_state(TASK_UNINTERRUPTIBLE);
+               __set_current_state(TASK_INTERRUPTIBLE);
                mod_timer(&timer, expire);
                schedule();
 
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