From: Namhyung Kim <namhyung@gmail.com>
To: Paul Menage <menage@google.com>, Li Zefan <lizf@cn.fujitsu.com>
Cc: containers@lists.linux-foundation.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: [PATCH 2/3] memcg: fix off-by-one when calculating swap cgroup map length
Date: Fri, 18 Mar 2011 21:54:14 +0900 [thread overview]
Message-ID: <1300452855-10194-2-git-send-email-namhyung@gmail.com> (raw)
In-Reply-To: <1300452855-10194-1-git-send-email-namhyung@gmail.com>
It allocated one more page than necessary if @max_pages was
a multiple of SC_PER_PAGE.
Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
mm/page_cgroup.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c
index 2d1a0fa01d7b..29951abc852e 100644
--- a/mm/page_cgroup.c
+++ b/mm/page_cgroup.c
@@ -446,7 +446,7 @@ int swap_cgroup_swapon(int type, unsigned long max_pages)
if (!do_swap_account)
return 0;
- length = ((max_pages/SC_PER_PAGE) + 1);
+ length = DIV_ROUND_UP(max_pages, SC_PER_PAGE);
array_size = length * sizeof(void *);
array = vmalloc(array_size);
--
1.7.4
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next prev parent reply other threads:[~2011-03-18 12:54 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-18 12:54 [PATCH 1/3] memcg: mark init_section_page_cgroup() properly Namhyung Kim
2011-03-18 12:54 ` Namhyung Kim [this message]
2011-03-21 23:58 ` [PATCH 2/3] memcg: fix off-by-one when calculating swap cgroup map length KAMEZAWA Hiroyuki
2011-03-22 3:13 ` Balbir Singh
2011-03-18 12:54 ` [PATCH 3/3] memcg: move page-freeing code outside of lock Namhyung Kim
2011-03-21 23:59 ` KAMEZAWA Hiroyuki
2011-03-22 3:04 ` Namhyung Kim
2011-03-22 3:09 ` Balbir Singh
2011-03-22 4:56 ` KAMEZAWA Hiroyuki
2011-03-22 10:06 ` Namhyung Kim
2011-03-23 4:36 ` KAMEZAWA Hiroyuki
2011-03-23 11:59 ` [PATCH] memcg: move page-freeing code out " Namhyung Kim
2011-03-23 23:37 ` KAMEZAWA Hiroyuki
2011-03-21 23:57 ` [PATCH 1/3] memcg: mark init_section_page_cgroup() properly KAMEZAWA Hiroyuki
2011-03-22 3:10 ` Balbir Singh
2011-04-01 1:18 ` Namhyung Kim
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