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

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Message-ID: <20100318112414.GL12388@csn.ul.ie>
Date:	Thu, 18 Mar 2010 11:24:14 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	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 Thu, Mar 18, 2010 at 08:56:23AM +0900, KOSAKI Motohiro wrote:
> > 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.
> 
> Yes, Kconfig mess freqently shot ourself in past days. if we have a chance
> to remove unnecessary dependency, we should do. that's my intention of the last mail.
> 

But if the depends line is removed, it could be set without NUMA, memory
hot-remove or compaction enabled. That wouldn't be very useful. I'm
missing something obvious.

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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