linux-kernel - Re: [tip:sched/numa] sched/numa: Introduce sys_numa

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Date:	Fri, 18 May 2012 17:33:43 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Rik van Riel <riel@...hat.com>, mingo@...nel.org, hpa@...or.com,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	pjt@...gle.com, bharata.rao@...il.com, akpm@...ux-foundation.org,
	Lee.Schermerhorn@...com, aarcange@...hat.com, danms@...ibm.com,
	suresh.b.siddha@...el.com, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/numa] sched/numa: Introduce sys_numa_{t,m}bind()

On Fri, 2012-05-18 at 10:25 -0500, Christoph Lameter wrote:
> On Fri, 18 May 2012, Rik van Riel wrote:
> 
> > I like your code for handling smaller processes in NUMA
> > systems, but we do need to have a serious discussion on
> > how to handle processes that do not fit in one node.
> 
> The home node seems to be associated with a thread and not a process. So
> we would be able to have multiple home nodes per process.

Its set the same for every thread in a process, unless you use the new
system calls to carve it up in pieces.

> The whole NUMA policy thing is already quite complex and this will
> increase that complexity somewhat. Wish we could simplify things somehow.

Most of that is due to existing interfaces, I'm afraid we cannot
simplify without reducing those :/
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