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    SubjectRe: [PATCH] Describe race of direct read and fork for unaligned buffers
    On Mon, Apr 30, 2012 at 11:30:07AM +0200, Jan Kara wrote:
    > This is a long standing problem (or a surprising feature) in our implementation
    > of get_user_pages() (used by direct IO). Since several attempts to fix it
    > failed (e.g.
    > http://linux.derkeiler.com/Mailing-Lists/Kernel/2009-04/msg06542.html, or
    > http://lkml.indiana.edu/hypermail/linux/kernel/0903.1/01498.html refused in
    > http://comments.gmane.org/gmane.linux.kernel.mm/31569) and it's not completely
    > clear whether we really want to fix it given the costs, let's at least document
    > it.
    >
    > CC: mgorman@suse.de
    > CC: Jeff Moyer <jmoyer@redhat.com>
    > Signed-off-by: Jan Kara <jack@suse.cz>

    Acked-by: Mel Gorman <mgorman@suse.de>

    --
    Mel Gorman
    SUSE Labs


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