KSM pages can be shared between tasks that are not necessarily related to
each other from a NUMA perspective. This patch causes those pages to be
ignored by automatic NUMA balancing so they do not migrate and do not
cause unrelated tasks to be grouped together.
Signed-off-by: Mel Gorman <mgorman@suse.de> Reviewed-by: Rik van Riel <riel@redhat.com> Cc: Alex Thorlton <athorlton@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>