linux-kernel - Re: memcg: Fix init/Kconfig documentation

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Message-Id: <20081021151105.f13ec6d2.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 21 Oct 2008 15:11:05 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	nishimura@....nes.nec.co.jp
Subject: Re: memcg: Fix init/Kconfig documentation

On Tue, 21 Oct 2008 11:21:18 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> From: Balbir Singh <balbir@...ux.vnet.ibm.com>
> Date: Tue, 21 Oct 2008 11:12:45 +0530
> Subject: [PATCH] memcg: Update Kconfig to remove the struct page overhead statement.
> 
> The memory resource controller no longer has a struct page overhead
> associated with it. The init/Kconfig help has been replaced with
> something more suitable based on the current implementation.
> 
Oh, this is my version..could you merge if this includes something good ?

==
Fixes menu help text for memcg-allocate-page-cgroup-at-boot.patch.


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

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

Index: mmotm-2.6.27+/init/Kconfig
===================================================================
--- mmotm-2.6.27+.orig/init/Kconfig
+++ mmotm-2.6.27+/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 almost all bads.
+	  (and lost 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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