linux-kernel - Re: [PATCH] Update sched_domains_numa

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Message-ID: <1348481528.11847.29.camel@twins>
Date:	Mon, 24 Sep 2012 12:12:08 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	Tang Chen <tangchen@...fujitsu.com>, linux-kernel@...r.kernel.org,
	x86@...nel.org, linux-numa@...r.kernel.org, wency@...fujitsu.com,
	mingo@...nel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] Update sched_domains_numa_masks when new cpus are
 onlined.

On Mon, 2012-09-24 at 15:27 +0530, Srivatsa S. Bhat wrote:
> On 09/24/2012 03:08 PM, Peter Zijlstra wrote:  
> >> +       hotcpu_notifier(sched_domains_numa_masks_update, CPU_PRI_SCHED_ACTIVE);
> >>         hotcpu_notifier(cpuset_cpu_active, CPU_PRI_CPUSET_ACTIVE);
> >>         hotcpu_notifier(cpuset_cpu_inactive, CPU_PRI_CPUSET_INACTIVE);
> > 
> > OK, so you really want your notifier to run before cpuset_cpu_active
> > because otherwise you get that crash, yet you fail with the whole order
> > thing.. You should not _ever_ rely on registration order.
> > 
> 
> IMHO he isn't relying on registration order.. He uses the CPU_PRI_SCHED_ACTIVE
> priority to ensure that the ordering of callbacks is right, isn't it?

Oh argh indeed. I can't read :/


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