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authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>2012-03-05 14:59:20 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-05 15:49:43 -0800
commite6ca7b89dc76abf77c80887fed54e0a60c87c0a8 (patch)
treeedfd8cce78c61cbf6cd9e738662ad25baa2b2bc0 /mm
parent1c641e84719429bbfe62a95ed3545ee7fe24408f (diff)
downloadlinux-e6ca7b89dc76abf77c80887fed54e0a60c87c0a8.tar.gz
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>
Diffstat (limited to 'mm')
-rw-r--r--mm/memcontrol.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index d0e57a3cda1..5585dc3d364 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5075,7 +5075,7 @@ static struct page *mc_handle_present_pte(struct vm_area_struct *vma,
return NULL;
if (PageAnon(page)) {
/* we don't move shared anon */
- if (!move_anon() || page_mapcount(page) > 2)
+ if (!move_anon() || page_mapcount(page) > 1)
return NULL;
} else if (!move_file())
/* we ignore mapcount for file pages */