The commit is pushed to "branch-rh7-3.10.0-123.1.2-ovz" and will appear at
https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-123.1.2.vz7.4.9
------>
commit b527d3cd43eea6fa1b0d75d72c99dd1af522f0b7
Author: Vladimir Davydov <vdavy...@parallels.com>
Date: Thu Apr 30 19:28:18 2015 +0400
ms/mm/memcg: do not use vmalloc for mem_cgroup allocations
The vmalloc was introduced by 33327948782b ("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 commit 45cf7ebd5a03 ("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 <vdavy...@parallels.com>
Acked-by: Michal Hocko <mho...@suse.cz>
Cc: Glauber Costa <glom...@openvz.org>
Cc: Johannes Weiner <han...@cmpxchg.org>
Cc: Balbir Singh <bsinghar...@gmail.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hir...@jp.fujitsu.com>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
(cherry picked from commit 8ff69e2c85f84b6b371e3c1d01207e73c0500125)
---
mm/memcontrol.c | 28 ++++++----------------------
1 file changed, 6 insertions(+), 22 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index ac75d76..e772a06 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>
@@ -357,12 +356,6 @@ struct mem_cgroup {
struct mem_cgroup_lru_info info;
};
-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, /* accounted by this cgroup itself */
@@ -6010,14 +6003,12 @@ 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;
@@ -6028,10 +6019,7 @@ 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;
}
@@ -6049,7 +6037,6 @@ out_free:
static void __mem_cgroup_free(struct mem_cgroup *memcg)
{
int node;
- size_t size = memcg_size();
mem_cgroup_remove_from_trees(memcg);
free_css_id(&mem_cgroup_subsys, &memcg->css);
@@ -6071,10 +6058,7 @@ 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);
}
/*
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