linux-kernel - [PATCH] cgroup: prefer [kv]zalloc over [kv]malloc+memset in memory controller code.

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Message-ID: <alpine.LNX.2.00.1011012038490.12889@swampdragon.chaosbits.net>
Date:	Mon, 1 Nov 2010 20:40:56 +0100 (CET)
From:	Jesper Juhl <jj@...osbits.net>
To:	linux-kernel@...r.kernel.org
cc:	linux-mm@...ck.org, Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Pavel Emelianov <xemul@...nvz.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Paul Menage <menage@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>,
	containers@...ts.linux-foundation.org
Subject: [PATCH] cgroup: prefer [kv]zalloc over [kv]malloc+memset in memory
 controller code.

Hi (please CC me on replies),


Apologies to those who receive this multiple times. I screwed up the To: 
field in my original mail :-(


In mem_cgroup_alloc() we currently do either kmalloc() or vmalloc() then 
followed by memset() to zero the memory. This can be more efficiently 
achieved by using kzalloc() and vzalloc().


Signed-off-by: Jesper Juhl <jj@...osbits.net>
---
 memcontrol.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 9a99cfa..90da698 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4199,14 +4199,13 @@ static struct mem_cgroup *mem_cgroup_alloc(void)
 
 	/* Can be very big if MAX_NUMNODES is very big */
 	if (size < PAGE_SIZE)
-		mem = kmalloc(size, GFP_KERNEL);
+		mem = kzalloc(size, GFP_KERNEL);
 	else
-		mem = vmalloc(size);
+		mem = vzalloc(size);
 
 	if (!mem)
 		return NULL;
 
-	memset(mem, 0, size);
 	mem->stat = alloc_percpu(struct mem_cgroup_stat_cpu);
 	if (!mem->stat) {
 		if (size < PAGE_SIZE)


-- 
Jesper Juhl <jj@...osbits.net>             http://www.chaosbits.net/
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