memcg: use [kv]zalloc[_node] rather than [kv]malloc+memset

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().  There's also one situation
where we can use kzalloc_node() - this is what's new in this version of
the patch.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c339d7431bda9e19993023479a0582f56e1f4ca3..6424ba0fce836fa36f4e31c0734eed56138e2b9b 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4216,13 +4216,11 @@ 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];
                for_each_lru(l)
@@ -4246,14 +4244,13 @@ 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;