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memcg: fix mapcount check in move charge code for anonymous page

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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>
This commit is contained in:
Naoya Horiguchi 2012-03-05 14:59:20 -08:00 committed by Linus Torvalds
parent 1c641e8471
commit e6ca7b89dc
1 changed files with 1 additions and 1 deletions
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2
mm/memcontrol.c
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@ -5075,7 +5075,7 @@ static struct page *mc_handle_present_pte(struct vm_area_struct *vma,
return NULL; return NULL;
if (PageAnon(page)) { if (PageAnon(page)) {
/* we don't move shared anon */ /* we don't move shared anon */
if (!move_anon() || page_mapcount(page) > 2) if (!move_anon() || page_mapcount(page) > 1)
return NULL; return NULL;
} else if (!move_file()) } else if (!move_file())
/* we ignore mapcount for file pages */ /* we ignore mapcount for file pages */