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

Jesper Juhl jj at chaosbits.net
Mon Nov 1 12:40:56 PDT 2010

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 at chaosbits.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);
-		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 at chaosbits.net>             http://www.chaosbits.net/
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