linux-kernel - Re: [RFC][PATCH] CPUSets: Move most calls to rebuild_sched

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Date:	Fri, 27 Jun 2008 20:42:23 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Gautham R Shenoy <ego@...ibm.com>
Cc:	Paul Menage <menage@...gle.com>,
	Vegard Nossum <vegard.nossum@...il.com>,
	Paul Jackson <pj@....com>, a.p.zijlstra@...llo.nl,
	maxk@...lcomm.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] CPUSets: Move most calls to rebuild_sched_domains() to the workqueue

On 06/27, Gautham R Shenoy wrote:
>
> > Using a multithreaded workqueue(kevent here) for this is not such a
> > great idea this,since currently we cannot call
> > get_online_cpus() from a workitem executed by a multithreaded workqueue.
> > 
> > Can one use a single threaded workqueue here instead ?

Yes, this should help.

But I think you are right, we should just fix this annoying problem,

> > Or, better, I think we can ask Oleg to re-submit the patch he had to make
> > get_online_cpus() safe to be called from within the workqueue. It does
> > require a special post CPU_DEAD notification, but as it does work the
> > last time I checked.

OK, will do on Sunday.

Oleg.

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