linux-kernel - Re: sched domains oddness.

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Message-ID: <20081031175813.GC10468@linux-os.sc.intel.com>
Date:	Fri, 31 Oct 2008 10:58:14 -0700
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Dave Jones <davej@...hat.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>
Cc:	venkatesh.pallipadi@...el.com
Subject: Re: sched domains oddness.

On Fri, Oct 31, 2008 at 10:37:37AM -0700, Dave Jones wrote:
> Even curiouser.. When I unplug AC and replug it, it happens again, but slightly
> differently..
> 
> CPU0 attaching NULL sched-domain.
> CPU1 attaching NULL sched-domain.
> CPU0 attaching sched-domain:
>  domain 0: span 0-1 level MC
>   groups: 0 1
>   domain 1: span 0-1 level CPU
>    groups: 0-1
>    domain 2: span 0-1 level NODE
>     groups: 0-1
> CPU1 attaching sched-domain:
>  domain 0: span 0-1 level MC
>   groups: 1 0
>   domain 1: span 0-1 level CPU
>    groups: 0-1
>    domain 2: span 0-1 level NODE
>     groups: 0-1
> CPU0 attaching NULL sched-domain.
> CPU1 attaching NULL sched-domain.
> CPU0 attaching sched-domain:
>  domain 0: span 0-1 level MC
>   groups: 0 1
>   domain 1: span 0-1 level NODE
>    groups: 0-1
> CPU1 attaching sched-domain:
>  domain 0: span 0-1 level MC
>   groups: 1 0
>   domain 1: span 0-1 level NODE
>    groups: 0-1
> 
> 
> Note how the CPU level doesn't show up in the 2nd case.

This is def coming from sched_mc_power_savings. Some battery script
or something is getting notified and setting this value. Can you do
a grep from / for sched_mc_power_savings ?

> This still doesn't explain the flip-flop I saw just from booting,
> as that was on AC the whole time.

Boot messages are def something not related to sched_mc_power_savings.

thanks,
suresh
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