linux-kernel - Re: + cpu_hotplug-dont-affect-current-tasks-affinity.patch added to -mm tree

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Message-ID: <20090729212125.GA16970@redhat.com>
Date:	Wed, 29 Jul 2009 23:21:25 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Rusty Russell <rusty@...tcorp.com.au>
Cc:	linux-kernel@...r.kernel.org, Li Zefan <lizf@...fujitsu.com>,
	Miao Xie <miaox@...fujitsu.com>,
	Paul Menage <menage@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Gautham R Shenoy <ego@...ibm.com>
Subject: Re: + cpu_hotplug-dont-affect-current-tasks-affinity.patch added
	to -mm tree

(add more CCs)

On 07/29, Oleg Nesterov wrote:
>
> But can't we make a much more simple patch ?
>
> Why should we play with set_cpus_allowed() at all? We can just migrate
> the caller of _cpu_down() before other tasks, right after take_cpu_down()
> does __cpu_disable()->remove_cpu_from_maps().
>
> No?
>
> Oleg.
>
> ------------------------------------------------------------------------
> Uncompiled, and we need to export move_task_off_dead_cpu(). Just to
> explain what I mean.

OK, tested. I think this should work. But first we should fix the bug
with cpusets. I'll send the patch in a minute...

Oleg.

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