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    SubjectRe: [PATCH 2/2] mm: fix race between shift_arg_pages and rmap_walk

    On Mon, 3 May 2010, Rik van Riel wrote:
    > migrate.c requires rmap to be able to find all ptes mapping a page at
    > all times, otherwise the migration entry can be instantiated, but it
    > can't be removed if the second rmap_walk fails to find the page.

    Please correct me if I'm wrong, but this patch looks like pure and utter

    It looks like it makes execve() do a totally insane "create and then
    immediately destroy temporary vma and anon_vma chain" for a case that is
    unlikely to ever matter.

    In fact, for a case that isn't even normally _enabled_, namely migration.

    Why would we want to slow down execve() for that?


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      Last update: 2010-05-03 18:39    [W:0.020 / U:6.560 seconds]
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