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

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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