linux-kernel - [PATCH] use vmalloc for mem

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Date:	Tue, 15 Apr 2008 11:10:38 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"xemul@...nvz.org" <xemul@...nvz.org>, lizf@...fujitsu.com,
	menage@...gle.com, "linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
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@...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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