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

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Date:	Fri, 18 May 2012 10:47:52 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Peter Zijlstra <peterz@...radead.org>
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, 18 May 2012, Peter Zijlstra wrote:

> On Fri, 2012-05-18 at 17:35 +0200, Peter Zijlstra wrote:
> > I've also said many times over that I absolutely detest all the async
> > stuff because it messes up accounting. And until someone comes up with a
> > sane means of sorting that I'll stick to migrate-on-fault.
>
> The other nice advantage of migrate-on-fault is that you don't have to
> play lifetime games with vmas. This much simplifies that aspect.

The problem with migrate on fault in the past has been that there was no
consistent benefit from the overhead added to the system. Useless page
migration is a bit expensive.

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