linux-kernel - Re: [PATCH 04/11] Allow CONFIG_MIGRATION to be set without CONFIG

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Message-ID: <alpine.DEB.2.00.1003171135390.27268@router.home>
Date:	Wed, 17 Mar 2010 11:37:20 -0500 (CDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Mel Gorman <mel@....ul.ie>
cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 04/11] Allow CONFIG_MIGRATION to be set without CONFIG_NUMA
 or memory hot-remove

On Wed, 17 Mar 2010, Mel Gorman wrote:

> > If select MIGRATION works, we can remove "depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE"
> > line from config MIGRATION.
> >
>
> I'm not quite getting why this would be an advantage. COMPACTION
> requires MIGRATION but conceivable both NUMA and HOTREMOVE can work
> without it.

Avoids having to add additional CONFIG_XXX on the page migration "depends"
line in the future.

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