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Subject[PATCH] use vmalloc for mem_cgroup allocation. v2
On ia64, this kmalloc() requires order-4 pages. But this is not
necessary to be phisically contiguous. (and x86-32, which has
small vmalloc area, has small mem_cgroup struct.)

For here, vmalloc is better.

Changelog: v1->v2
- added memset().

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

Index: mm-2.6.25-rc8-mm2/mm/memcontrol.c
===================================================================
--- mm-2.6.25-rc8-mm2.orig/mm/memcontrol.c
+++ mm-2.6.25-rc8-mm2/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>

@@ -992,8 +993,10 @@ mem_cgroup_create(struct cgroup_subsys *
if (unlikely((cont->parent) == NULL)) {
mem = &init_mem_cgroup;
page_cgroup_cache = KMEM_CACHE(page_cgroup, SLAB_PANIC);
- } else
- mem = kzalloc(sizeof(struct mem_cgroup), GFP_KERNEL);
+ } else {
+ mem = vmalloc(sizeof(struct mem_cgroup));
+ memset(mem, 0, sizeof(*mem));
+ }

if (mem == NULL)
return ERR_PTR(-ENOMEM);
@@ -1011,7 +1014,7 @@ free_out:
for_each_node_state(node, N_POSSIBLE)
free_mem_cgroup_per_zone_info(mem, node);
if (cont->parent != NULL)
- kfree(mem);
+ vfree(mem);
return ERR_PTR(-ENOMEM);
}

@@ -1031,7 +1034,7 @@ static void mem_cgroup_destroy(struct cg
for_each_node_state(node, N_POSSIBLE)
free_mem_cgroup_per_zone_info(mem, node);

- kfree(mem_cgroup_from_cont(cont));
+ vfree(mem_cgroup_from_cont(cont));
}

static int mem_cgroup_populate(struct cgroup_subsys *ss,


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