linux-kernel - Re: [PATCH 07/39] autonuma: introduce kthread_bind

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Date:	Tue, 27 Mar 2012 17:45:35 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Hillf Danton <dhillf@...il.com>, Dan Smith <danms@...ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH 07/39] autonuma: introduce kthread_bind_node()

On Tue, 2012-03-27 at 17:22 +0200, Andrea Arcangeli wrote:
> I don't see what's wrong with more than 1 CPU in the hard bind
> cpumask.

Because its currently broken, but we're trying to restore its pure
semantic so that we can use it in more places again, like
debug_smp_processor_id(). Testing a single process flag is _much_
cheaper than testing ->cpus_allowed.

Adding more broken isn't an option.
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