memcgroup: use vmalloc for mem_cgroup allocation

On ia64, this kmalloc() requires order-4 pages.  But this is not necessary to
be physically contiguous.  For big mem_cgroup, vmalloc is better.  For small
ones, kmalloc is used.

[akpm@linux-foundation.org: simplification]
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 29 insertions, 6 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c5285afe2048..15aa34b11e88 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -31,6 +31,7 @@
 #include <linux/spinlock.h>
 #include <linux/fs.h>
 #include <linux/seq_file.h>
+#include <linux/vmalloc.h>
 
 #include <asm/uaccess.h>
 
@@ -983,6 +984,29 @@ static void free_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node)
         kfree(mem->info.nodeinfo[node]);
 }
 
+static struct mem_cgroup *mem_cgroup_alloc(void)
+{
+        struct mem_cgroup *mem;
+
+        if (sizeof(*mem) < PAGE_SIZE)
+                mem = kmalloc(sizeof(*mem), GFP_KERNEL);
+        else
+                mem = vmalloc(sizeof(*mem));
+
+        if (mem)
+                memset(mem, 0, sizeof(*mem));
+        return mem;
+}
+
+static void mem_cgroup_free(struct mem_cgroup *mem)
+{
+        if (sizeof(*mem) < PAGE_SIZE)
+                kfree(mem);
+        else
+                vfree(mem);
+}
+
+
 static struct cgroup_subsys_state *
 mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
 {
@@ -993,12 +1017,11 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
                 mem = &init_mem_cgroup;
                 page_cgroup_cache = KMEM_CACHE(page_cgroup, SLAB_PANIC);
         } else {
-                mem = kzalloc(sizeof(struct mem_cgroup), GFP_KERNEL);
+                mem = mem_cgroup_alloc();
+                if (!mem)
+                        return ERR_PTR(-ENOMEM);
         }
 
-        if (mem == NULL)
-                return ERR_PTR(-ENOMEM);
-
         res_counter_init(&mem->res);
 
         memset(&mem->info, 0, sizeof(mem->info));
@@ -1012,7 +1035,7 @@ free_out:
         for_each_node_state(node, N_POSSIBLE)
                 free_mem_cgroup_per_zone_info(mem, node);
         if (cont->parent != NULL)
-                kfree(mem);
+                mem_cgroup_free(mem);
         return ERR_PTR(-ENOMEM);
 }
 
@@ -1032,7 +1055,7 @@ static void mem_cgroup_destroy(struct cgroup_subsys *ss,
         for_each_node_state(node, N_POSSIBLE)
                 free_mem_cgroup_per_zone_info(mem, node);
 
-        kfree(mem_cgroup_from_cont(cont));
+        mem_cgroup_free(mem_cgroup_from_cont(cont));
 }
 
 static int mem_cgroup_populate(struct cgroup_subsys *ss,