linux-kernel - [PATCH] cgroup: Avoid a memset by using vzalloc

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Date:	Sat, 30 Oct 2010 23:35:46 +0200 (CEST)
From:	Jesper Juhl <jj@...osbits.net>
To:	linux-kernel@...r.kernel.org
cc:	linux-mm@...ck.org, Paul Menage <menage@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>,
	containers@...ts.linux-foundation.org
Subject: [PATCH] cgroup: Avoid a memset by using vzalloc

Hi,

We can avoid doing a memset in swap_cgroup_swapon() by using vzalloc().


Signed-off-by: Jesper Juhl <jj@...osbits.net>
---
compile tested only.
 page_cgroup.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c
index 5bffada..34970c7 100644
--- a/mm/page_cgroup.c
+++ b/mm/page_cgroup.c
@@ -450,11 +450,10 @@ int swap_cgroup_swapon(int type, unsigned long max_pages)
 	length = ((max_pages/SC_PER_PAGE) + 1);
 	array_size = length * sizeof(void *);
 
-	array = vmalloc(array_size);
+	array = vzalloc(array_size);
 	if (!array)
 		goto nomem;
 
-	memset(array, 0, array_size);
 	ctrl = &swap_cgroup_ctrl[type];
 	mutex_lock(&swap_cgroup_mutex);
 	ctrl->length = length;

-- 
Jesper Juhl <jj@...osbits.net>             http://www.chaosbits.net/
Plain text mails only, please      http://www.expita.com/nomime.html
Don't top-post  http://www.catb.org/~esr/jargon/html/T/top-post.html

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