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

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Date:	Fri, 18 May 2012 11:07:45 -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 11:00 -0500, Christoph Lameter wrote:
>
> > Having the page local is a win if there are a sufficient number of
> > accesses to amortize the effort to move the page. Given the expensive
> > nature of page migration there would need to be a large number of accesses
> > to a page to justify the effort.
>
> Right, but this is true of any migration scheme and not specific to MoF.

Yes and the concern about auto migration schemes not improving performance
in general applies to all migration schemes.
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