Re: 2.6.16-rc6-mm2: Why is CONFIG_MIGRATION available for everyone?

[Christoph Lameter]

On Tue, 21 Mar 2006, Adrian Bunk wrote:

> 5. Make it possible to configure NUMA systems without page migration
>    and non-NUMA systems with page migration.
> 
> 
> I don't see the point in making this option visible for the majority of 
> users on non-NUMA systems who will never need it.
> 
> When is it required on non-NUMA systems?
> Memory hotplug?

That is one. It also may be useful for transferring pages between various 
zones. Could be used to free up space in ZONE_DMA etc. Right now none of 
these uses exist so we could disable it by default for now?
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