memcg: fix mapcount check in move charge code for anonymous page
authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Mon, 5 Mar 2012 22:59:20 +0000 (14:59 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Mon, 5 Mar 2012 23:49:43 +0000 (15:49 -0800)
commite6ca7b89dc76abf77c80887fed54e0a60c87c0a8
treeedfd8cce78c61cbf6cd9e738662ad25baa2b2bc0
parent1c641e84719429bbfe62a95ed3545ee7fe24408f
memcg: fix mapcount check in move charge code for anonymous page

Currently the charge on shared anonyous pages is supposed not to moved in
task migration.  To implement this, we need to check that mapcount > 1,
instread of > 2.  So this patch fixes it.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reviewed-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/memcontrol.c