linux-kernel - Re: [PATCH 13/40] autonuma: CPU follow memory algorithm

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Message-ID: <1340995905.28750.113.camel@twins>
Date:	Fri, 29 Jun 2012 20:51:45 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Rik van Riel <riel@...hat.com>
Cc:	dlaor@...hat.com, Ingo Molnar <mingo@...nel.org>,
	Hillf Danton <dhillf@...il.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	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>,
	Johannes Weiner <hannes@...xchg.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>,
	Alex Shi <alex.shi@...el.com>,
	Mauricio Faria de Oliveira <mauricfo@...ux.vnet.ibm.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Don Morris <don.morris@...com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH 13/40] autonuma: CPU follow memory algorithm

On Fri, 2012-06-29 at 14:46 -0400, Rik van Riel wrote:
> > I've also stated several times that forceful migration in the context of
> > numa balancing must go.
> 
> I am not convinced about this part either way.
> 
> I do not see how a migration numa thread (which could potentially
> use idle cpu time) will be any worse than migrate on fault, which
> will always take away time from the userspace process. 

Any NUMA stuff is long term, it really shouldn't matter on the timescale
of a few jiffies.

NUMA placement should also not over-ride fairness, esp. not by default.
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