linux-kernel - Re: [PATCH]: exec: avoid propagating PF_NO

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Message-ID: <20131128162025.GA14937@redhat.com>
Date:	Thu, 28 Nov 2013 17:20:25 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Tejun Heo <htejun@...il.com>, zhang.yi20@....com.cn,
	lkml <linux-kernel@...r.kernel.org>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH]: exec: avoid propagating PF_NO_SETAFFINITY into
	userspace child

On 11/28, Peter Zijlstra wrote:
>
> On Thu, Nov 28, 2013 at 04:34:43PM +0100, Oleg Nesterov wrote:
> > But note that in the longer term we might want even more. We probably
> > want a non-daemonized thread controlled by the user-space. And even
> > more, this thread should be per-namespace (this needs a lot more
> > discussion).
>
> Which namespace? PID namespace I presume where we can have a 'new' init
> task and everything.
>
> I'm not sure, are any of these things (workqueues, userspace helpers)
> pid namespace aware? If not it doesn't seem to make sense to expose this
> to nested PID namespaces and would be something special for the root
> namespace.

Not sure I understand correctly. But yes, of course, it is not that
call_usermodehelper() should be namespace-friendly "unconditionally".

We need another API (although perhaps we can simply add UMH_NAMESPACE
flag, this doesn't matter).

Just for example, the piped core handler. Currently it is hardly useful
in containers.

> > But whataver we do later, I believe that the patch from Zhang should
> > be applied now.
>
> Probably, although with a much adjusted changelog.

Zhang, please make v3 ;)

Oleg.

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