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

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Message-Id: <1214507945.12265.7.camel@twins.programming.kicks-ass.net>
Date:	Thu, 26 Jun 2008 21:19:05 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Max Krasnyansky <maxk@...lcomm.com>
Cc:	Paul Menage <menage@...gle.com>,
	Vegard Nossum <vegard.nossum@...il.com>,
	Paul Jackson <pj@....com>, a.p.zijlstra@...llo.nl,
	linux-kernel@...r.kernel.org, Gautham R Shenoy <ego@...ibm.com>
Subject: Re: [RFC][PATCH] CPUSets: Move most calls to
	rebuild_sched_domains() to the workqueue

On Thu, 2008-06-26 at 11:49 -0700, Max Krasnyansky wrote:

> > Does that mean that you can't ever call get_online_cpus() from a
> > workqueue thread?
> 
> In general it should be ok (no different from user-space task calling 
> it). But there is still circular dependency because we're calling into
> domain partitioning code.
> Below is more detailed lockdep report with your patch applied on top of 
> -rc8.
> Looks like this might be a good time to rethink overall locking in there.

Gautham has been working on some of this recently. Perhaps he can share
his patch-stack again.



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