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

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Message-ID: <20131128150233.GA10022@twins.programming.kicks-ass.net>
Date:	Thu, 28 Nov 2013 16:02:33 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Oleg Nesterov <oleg@...hat.com>
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 Thu, Nov 28, 2013 at 04:00:55PM +0100, Oleg Nesterov wrote:
> And btw. Note ____call_usermodehelper()->set_cpus_allowed_ptr(cpu_all_mask).
> 
> Even if we change the affinity of the "khelper" worker threads this
> won't restrict the user-space helpers.
> 
> I think this set_cpus_allowed_ptr() should die in any case?

Yes. A while back someone proposed adding a magic cpumask to tweak in
order to contain the usermode helpers.

Obviously I thought that was a bad idea.
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