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Message-ID: <1332788223.16159.185.camel@twins>
Subject: Re: [PATCH 39/39] autonuma: NUMA scheduler SMT awareness
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
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>
Date: Mon, 26 Mar 2012 20:57:03 +0200
In-Reply-To: <1332783986-24195-40-git-send-email-aarcange@redhat.com>
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	 <1332783986-24195-40-git-send-email-aarcange@redhat.com>
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On Mon, 2012-03-26 at 19:46 +0200, Andrea Arcangeli wrote:
> Add SMT awareness to the NUMA scheduler so that it will not move load
> from fully idle SMT threads, to semi idle SMT threads.

This shows a complete fail in design, you're working around the regular
scheduler/load-balancer instead of with it and hence are duplicating all
kinds of stuff.

I'll not have that..

Nacked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>