From: Vladimir Davydov <vdavydov@parallels.com>
Date: Fri, 3 Jan 2014 03:10:03 +0000 (+1100)
Subject: memcg: do not use vmalloc for mem_cgroup allocations
X-Git-Tag: next-20140106~2^2~149
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=03e2d87f7c173db20295ff06d1571428d59af41c;p=karo-tx-linux.git

memcg: do not use vmalloc for mem_cgroup allocations

The vmalloc was introduced by 333279 ("memcgroup: use vmalloc for
mem_cgroup allocation"), because at that time MAX_NUMNODES was used for
defining the per-node array in the mem_cgroup structure so that the
structure could be huge even if the system had the only NUMA node.

The situation was significantly improved by patch 45cf7e ("memcg: reduce
the size of struct memcg 244-fold"), which made the size of the mem_cgroup
structure calculated dynamically depending on the real number of NUMA
nodes installed on the system (nr_node_ids), so now there is no point in
using vmalloc here: the structure is allocated rarely and on most systems
its size is about 1K.

Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Glauber Costa <glommer@openvz.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 9615407880ff..b8b35e1798b6 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -48,7 +48,6 @@
 #include <linux/sort.h>
 #include <linux/fs.h>
 #include <linux/seq_file.h>
-#include <linux/vmalloc.h>
 #include <linux/vmpressure.h>
 #include <linux/mm_inline.h>
 #include <linux/page_cgroup.h>
@@ -335,12 +334,6 @@ struct mem_cgroup {
 	/* WARNING: nodeinfo must be the last member here */
 };
 
-static size_t memcg_size(void)
-{
-	return sizeof(struct mem_cgroup) +
-		nr_node_ids * sizeof(struct mem_cgroup_per_node *);
-}
-
 /* internal only representation about the status of kmem accounting. */
 enum {
 	KMEM_ACCOUNTED_ACTIVE = 0, /* accounted by this cgroup itself */
@@ -6142,14 +6135,12 @@ static void free_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
 static struct mem_cgroup *mem_cgroup_alloc(void)
 {
 	struct mem_cgroup *memcg;
-	size_t size = memcg_size();
+	size_t size;
 
-	/* Can be very big if nr_node_ids is very big */
-	if (size < PAGE_SIZE)
-		memcg = kzalloc(size, GFP_KERNEL);
-	else
-		memcg = vzalloc(size);
+	size = sizeof(struct mem_cgroup);
+	size += nr_node_ids * sizeof(struct mem_cgroup_per_node *);
 
+	memcg = kzalloc(size, GFP_KERNEL);
 	if (!memcg)
 		return NULL;
 
@@ -6160,10 +6151,7 @@ static struct mem_cgroup *mem_cgroup_alloc(void)
 	return memcg;
 
 out_free:
-	if (size < PAGE_SIZE)
-		kfree(memcg);
-	else
-		vfree(memcg);
+	kfree(memcg);
 	return NULL;
 }
 
@@ -6181,7 +6169,6 @@ out_free:
 static void __mem_cgroup_free(struct mem_cgroup *memcg)
 {
 	int node;
-	size_t size = memcg_size();
 
 	mem_cgroup_remove_from_trees(memcg);
 
@@ -6202,10 +6189,7 @@ static void __mem_cgroup_free(struct mem_cgroup *memcg)
 	 * the cgroup_lock.
 	 */
 	disarm_static_keys(memcg);
-	if (size < PAGE_SIZE)
-		kfree(memcg);
-	else
-		vfree(memcg);
+	kfree(memcg);
 }
 
 /*