linux-kernel - Re: [PATCH 2/7] Allow CONFIG_MIGRATION to be set without CONFIG

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Message-ID: <20070619155932.GC17109@skynet.ie>
Date:	Tue, 19 Jun 2007 16:59:32 +0100
From:	mel@...net.ie (Mel Gorman)
To:	Christoph Lameter <clameter@....com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	kamezawa.hiroyu@...fujitsu.com
Subject: Re: [PATCH 2/7] Allow CONFIG_MIGRATION to be set without CONFIG_NUMA

On (18/06/07 10:04), Christoph Lameter didst pronounce:
> On Mon, 18 Jun 2007, Mel Gorman wrote:
> 
> > 
> > CONFIG_MIGRATION currently depends on CONFIG_NUMA. move_pages() is the only
> > user of migration today and as this system call is only meaningful on NUMA,
> > it makes sense. However, memory compaction will operate within a zone and is
> 
> There are more user of migration. move_pages is one of them, then there is
> cpuset process migration, MPOL_BIND page migration and sys_migrate_pages 
> for explicit process migration.

Ok, this was poor phrasing. Each of those features are NUMA related even
though the core migration mechanism is not dependant on NUMA.

> 
> > useful on both NUMA and non-NUMA systems. This patch allows CONFIG_MIGRATION
> > to be used in all memory models. To preserve existing behaviour, move_pages()
> > is only available when CONFIG_NUMA is set.
> 
> What does this have to do with memory models? A bit unclear.
> 

More poor phrasing. It would have been clearer to simply say that the
patch allows CONFIG_MIGRATION to be used without NUMA.

> Otherwise
> 
> Acked-by: Christoph Lameter <clameter@....com>

Thanks

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