linux-kernel - [PATCH] memcg: uptodate menuconfig help text

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Message-Id: <20081022105459.3f7f2485.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 22 Oct 2008 10:54:59 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"xemul@...nvz.org" <xemul@...nvz.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: [PATCH] memcg: uptodate menuconfig help text

Now, page_cgroup is allocated at boot and memmap doesn't includes pointer for
page_cgroup.
Fixes menu help text for memcg-allocate-page-cgroup-at-boot.patch.

Reviewed-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
Signed-off-by: KAMEZAWA hiroyuki <kamezawa.hiroyu@...fujitsu.com>

 init/Kconfig |   16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

Index: linux-2.6/init/Kconfig
===================================================================
--- linux-2.6.orig/init/Kconfig
+++ linux-2.6/init/Kconfig
@@ -401,16 +401,20 @@ config CGROUP_MEM_RES_CTLR
 	depends on CGROUPS && RESOURCE_COUNTERS
 	select MM_OWNER
 	help
-	  Provides a memory resource controller that manages both page cache and
-	  RSS memory.
+	  Provides a memory resource controller that manages both anonymous
+	  memory and page cache. (See Documentation/controllers/memory.txt)
 
 	  Note that setting this option increases fixed memory overhead
-	  associated with each page of memory in the system by 4/8 bytes
-	  and also increases cache misses because struct page on many 64bit
-	  systems will not fit into a single cache line anymore.
+	  associated with each page of memory in the system. By this,
+	  20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory
+	  usage tracking struct at boot. Total amount of this is printed out
+	  at boot.
 
 	  Only enable when you're ok with these trade offs and really
-	  sure you need the memory resource controller.
+	  sure you need the memory resource controller. Even when you enable
+	  this, you can set "cgroup_disable=memory" at your boot option to
+	  disable memory resource controller and you can avoid overheads.
+	  (and lose benefits of memory resource contoller)
 
 	  This config option also selects MM_OWNER config option, which
 	  could in turn add some fork/exit overhead.

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