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

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Message-ID: <Pine.LNX.4.64.0706180956440.4751@schroedinger.engr.sgi.com>
Date:	Mon, 18 Jun 2007 10:04:15 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Mel Gorman <mel@....ul.ie>
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 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.

> 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.

Otherwise

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

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