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    DateTue, 21 Mar 2006 14:57:27 -0800 (PST)
    FromChristoph Lameter <>
    SubjectRe: 2.6.16-rc6-mm2: Why is CONFIG_MIGRATION available for everyone?
    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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