linux-kernel - Re: [PATCH] Update sched_domains_numa

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Message-ID: <5061196C.8090702@cn.fujitsu.com>
Date:	Tue, 25 Sep 2012 10:39:40 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	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 09/24/2012 05:57 PM, 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?

Yes, that's right. Thanks. :)

>
> Regards,
> Srivatsa S. Bhat
>
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