commit 6abb5a867ba0866cb21827b172cee6aa71244bd1
author Johannes Weiner <hannes@cmpxchg.org> Fri Aug 08 14:19:33 2014 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> Fri Aug 08 15:57:18 2014 -0700
tree 069d4eac9f0bfa9586c978362c9b7c7d0d40b288
parent 3cbb01871e22709fdd39478eca831de317df332f

mm: memcontrol: avoid charge statistics churn during page migration

Charge migration currently disables IRQs twice to update the charge
statistics for the old page and then again for the new page.

But migration is a seamless transition of a charge from one physical
page to another one of the same size, so this should be a non-event from
an accounting point of view.  Leave the statistics alone.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>