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

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Date:	Thu, 28 Nov 2013 09:57:23 -0500
From:	Tejun Heo <htejun@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
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 03:55:05PM +0100, Peter Zijlstra wrote:
> 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.

And you can't do that reliably from userland.  Those things are
created dynamically.  workqueue provides per-workqueue attributes to
enable those use cases.  It doesn't have system-wide default
attributes right now but adding that shouldn't be too difficult.

-- 
tejun
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