linux-kernel - [PATCH] memcg: make global var to be read

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Message-Id: <20080509145631.408a9a67.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 9 May 2008 14:56:31 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	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,
	"yamamoto@...inux.co.jp" <yamamoto@...inux.co.jp>
Subject: [PATCH] memcg: make global var to be read_mostly

An easy cut out from memcg: performance improvement patch set.
Tested on: x86-64/linux-2.6.26-rc1-git6

Thanks,
-Kame

==
mem_cgroup_subsys and page_cgroup_cache should be read_mostly and
MEM_CGROUP_RECLAIM_RETRIES can be just a fixed number.

Changelog:
  * makes MEM_CGROUP_RECLAIM_RETRIES to be a macro

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



Index: linux-2.6.26-rc1/mm/memcontrol.c
===================================================================
--- linux-2.6.26-rc1.orig/mm/memcontrol.c
+++ linux-2.6.26-rc1/mm/memcontrol.c
@@ -35,9 +35,9 @@
 
 #include <asm/uaccess.h>
 
-struct cgroup_subsys mem_cgroup_subsys;
-static const int MEM_CGROUP_RECLAIM_RETRIES = 5;
-static struct kmem_cache *page_cgroup_cache;
+struct cgroup_subsys mem_cgroup_subsys __read_mostly;
+static struct kmem_cache *page_cgroup_cache __read_mostly;
+#define MEM_CGROUP_RECLAIM_RETRIES	5
 
 /*
  * Statistics for memory cgroup.

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