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

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Date:	Fri, 29 Jun 2012 21:03:06 +0200
From:	Peter Zijlstra <peterz@...radead.org>
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 20:57 +0200, Peter Zijlstra wrote:
> On Fri, 2012-06-29 at 14:46 -0400, Rik van Riel wrote:
> > 
> > I am not convinced all architectures that have CONFIG_NUMA
> > need to be a requirement, since some of them (eg. Alpha)
> > seem to be lacking a maintainer nowadays. 
> 
> Still, this NUMA balancing stuff is not a small tweak to load-balancing.
> Its a very significant change is how you schedule. Having such great
> differences over architectures isn't something I look forward to.

Also, Andrea keeps insisting arch support is trivial, so I don't see the
problem.
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