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    SubjectRe: [PATCH 0/4] Swap migration V3: Overview
    mike kravetz wrote:
    >>>Just to be clear, there are at least two distinct requirements for hotplug.
    >>>One only wants to remove a quantity of memory (location unimportant). The
    >>>other wants to remove a specific section of memory (location specific). I
    >>>think the first is easier to address.
    >>>
    >>
    >>The only difficulty to remove a quantity of memory is how to find
    >>where is easy to be removed. If this is fixed, I think it is
    >>easier to address.
    >
    >
    > We have been using Mel's fragmentation patches. One of the data structures
    > created by these patches is a 'usemap' thats tracks how 'blocks' of memory
    > are used. I exposed the usemaps via sysfs along with other hotplug memory
    > section attributes. So, you can then have a user space program scan the
    > usemaps looking for sections that can be easily offlined.
    >
    yea, looks nice :)
    But such pages are already shown as hotpluggable, I think.
    ACPI/SRAT will define the range, in ia64.

    The difficulty is how to find hard-to-migrate pages, as Andrew pointed out.



    Thanks,
    -- Kame

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