linux-kernel - Re: [PATCH 39/39] autonuma: NUMA scheduler SMT awareness

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Message-ID: <1332788223.16159.185.camel@twins>
Date:	Mon, 26 Mar 2012 20:57:03 +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 39/39] autonuma: NUMA scheduler SMT awareness

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@...llo.nl>
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