Messages in this thread | | | Date | Mon, 30 Apr 2012 15:30:04 +0100 | From | Mel Gorman <> | Subject | Re: [PATCH] Describe race of direct read and fork for unaligned buffers |
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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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