linux-kernel - Re: [RFC] cpuset update_cgroup_cpus

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Message-Id: <20071015193259.f9eb51b2.pj@sgi.com>
Date:	Mon, 15 Oct 2007 19:32:59 -0700
From:	Paul Jackson <pj@....com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	menage@...gle.com, nickpiggin@...oo.com.au, a.p.zijlstra@...llo.nl,
	balbir@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	clg@...ibm.com, ebiederm@...ssion.com, containers@...ts.osdl.org,
	serue@...ibm.com, svaidy@...ux.vnet.ibm.com,
	akpm@...ux-foundation.org, xemul@...nvz.org
Subject: Re: [RFC] cpuset update_cgroup_cpus_allowed

> Yet by not doing any locking here to prevent a cpu from being 
> hot-unplugged, you can race and allow the hot-unplug event to happen 
> before calling set_cpus_allowed().  That makes this entire function a 
> no-op with set_cpus_allowed() returning -EINVAL for every call, which 
> isn't caught, and no error is reported to userspace.

Good point ... hmmm ...

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@....com> 1.925.600.0401
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