linux-kernel - Re: [PATCH] task containersv11 add tasks file interface fix for cpusets

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Message-ID: <6599ad830710030851jb44f00ft9634f9381218b6e9@mail.gmail.com>
Date:	Wed, 3 Oct 2007 08:51:41 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	"Paul Jackson" <pj@....com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Nick Piggin" <nickpiggin@...oo.com.au>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Serge E. Hallyn" <serue@...ibm.com>,
	"Cedric Le Goater" <clg@...ibm.com>, linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"David Rientjes" <rientjes@...gle.com>,
	"Vaidyanathan Srinivasan" <svaidy@...ux.vnet.ibm.com>,
	"Pavel Emelianov" <xemul@...nvz.org>, containers@...ts.osdl.org,
	balbir@...ux.vnet.ibm.com
Subject: Re: [PATCH] task containersv11 add tasks file interface fix for cpusets

On 10/3/07, Paul Jackson <pj@....com> wrote:
> From: Paul Jackson <pj@....com>
>
> The code in kernel/cgroup.c attach_task() which skips the
> attachment of a task to the group it is already in has to be
> removed.  Cpusets depends on reattaching a task to its current
> cpuset, in order to trigger updating the cpus_allowed mask in the
> task struct.

Can you explain a bit more about why this is needed? (i.e. specific
scenarios where cpusets will break without this change).

What triggers the reattach in normal use? Something from userspace?

Paul
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