linux-kernel - Re: [PATCH] sched/kthread: Complain loudly when others violate our flags

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Message-ID: <20110930035501.GG10425@mtj.dyndns.org>
Date:	Thu, 29 Sep 2011 20:55:01 -0700
From:	Tejun Heo <htejun@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] sched/kthread: Complain loudly when others violate our
 flags

On Tue, Sep 27, 2011 at 05:17:34PM -0400, Steven Rostedt wrote:
> For convenience and optimization, we are going to use the task's flag
> PF_THREAD_BOUND as a way to know if a task is bound to a CPU or not. As
> that is what the flag means.

And I'm not sure this is a very good idea.  Until now, PF_THREAD_BOUND
meant "this task is explicitly bound to the current affinity (whatever
it is) and thus it shouldn't be manipulated by third party".  The
suggested change makes the flag much less orthogonal and useful.  How
much of convenience and optimization are we talking about?

Thanks.

-- 
tejun
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