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

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Message-ID: <20131128145505.GX10022@twins.programming.kicks-ass.net>
Date:	Thu, 28 Nov 2013 15:55:05 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tejun Heo <htejun@...il.com>
Cc:	Oleg Nesterov <oleg@...hat.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 09:38:48AM -0500, Tejun Heo wrote:
> Hah?  No, we do not want to allow userland to be able to set
> affinities on any workqueue workers, period.  That's just inviting
> people to do weirdest things and then reporting things like "crypt
> jobs on some of our 500 machines end up stuck on a single cpu once in
> a while" which will eventually be tracked down to some weird shell
> script setting affinity on workers doing something else.

Because that is exactly what some users desire? Some RT and HPC people
want all those crypt jobs to run on a few designated cpus and not wreck
their compute jobs.
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