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* [PATCH] mm: Remove two memset calls in mm/memcontrol.c by using the zalloc variants of alloc functions
@ 2011-01-12 20:39 Jesper Juhl
  2011-01-12 23:03 ` Minchan Kim
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Jesper Juhl @ 2011-01-12 20:39 UTC (permalink / raw)
  To: linux-mm
  Cc: Balbir Singh, Pavel Emelianov, Daisuke Nishimura,
	KAMEZAWA Hiroyuki, Andrew Morton, linux-kernel

We can avoid two calls to memset() in mm/memcontrol.c by using 
kzalloc_node(), kzalloc & vzalloc().

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
---
 memcontrol.c |    8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 00bb8a6..890df27 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4176,12 +4176,11 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node)
 	 */
 	if (!node_state(node, N_NORMAL_MEMORY))
 		tmp = -1;
-	pn = kmalloc_node(sizeof(*pn), GFP_KERNEL, tmp);
+	pn = kzalloc_node(sizeof(*pn), GFP_KERNEL, tmp);
 	if (!pn)
 		return 1;
 
 	mem->info.nodeinfo[node] = pn;
-	memset(pn, 0, sizeof(*pn));
 
 	for (zone = 0; zone < MAX_NR_ZONES; zone++) {
 		mz = &pn->zoneinfo[zone];
@@ -4206,14 +4205,13 @@ 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)
 		goto out_free;



-- 
Jesper Juhl <jj@chaosbits.net>            http://www.chaosbits.net/
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^ permalink raw reply related	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2011-01-13  0:36 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2011-01-12 20:39 [PATCH] mm: Remove two memset calls in mm/memcontrol.c by using the zalloc variants of alloc functions Jesper Juhl
2011-01-12 23:03 ` Minchan Kim
2011-01-13  0:08 ` KAMEZAWA Hiroyuki
2011-01-13  0:28 ` Daisuke Nishimura

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