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    SubjectRe: [RFC] memory defragmentation to satisfy high order allocations
    Marcelo Tosatti <marcelo.tosatti@cyclades.com> wrote:
    >
    > The following patch implements a "coalesce_memory()" function
    > which takes "zone" and "order" as a parameter.
    >
    > It tries to move enough physically nearby pages to form a free area
    > of "order" size.
    >
    > It does that by checking whether the page can be moved, allocating a new page,
    > unmapping the pte's to it, copying data to new page, remapping the ptes,
    > and reinserting the page on the radix/LRU.

    Presumably this duplicates some of the memory hot-remove patches.

    Apparently Dave Hansen has working and sane-looking hot remove code
    which is in a close-to-submittable state.
    -
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