mm/migration: Improve migrate_misplaced_page()

mm/migration: Improve migrate_misplaced_page()

Fix, improve and clean up migrate_misplaced_page() to
reuse migrate_pages() and to check for zone watermarks
to make sure we don't overload the node.

This was originally based on Peter's patch "mm/migrate: Introduce
migrate_misplaced_page()" but borrows extremely heavily from Andrea's
"autonuma: memory follows CPU algorithm and task/mm_autonuma stats
collection".

Based-on-work-by: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Based-on-work-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Based-on-work-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Linux-MM <linux-mm@kvack.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Link: http://lkml.kernel.org/r/1353064973-26082-14-git-send-email-mgorman@suse.de
[ Adapted to the numa/core tree. Kept Mel's patch separate to retain
  original authorship for the authors. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>