linux-kernel - Re: [-mm] Disable the memory controller by default

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Message-ID: <47FA0D85.201@linux.vnet.ibm.com>
Date:	Mon, 07 Apr 2008 17:33:17 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	YAMAMOTO Takashi <yamamoto@...inux.co.jp>,
	Paul Menage <menage@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Pavel Emelianov <xemul@...nvz.org>,
	hugh@...itas.com,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [-mm] Disable the memory controller by default

Andi Kleen wrote:
> On Mon, Apr 07, 2008 at 05:21:37PM +0530, Balbir Singh wrote:
>>
>> Due to the overhead of the memory controller. The
>> memory controller is now disabled by default. This patch changes
>> cgroup_disable to cgroup_toggle, so that each controller can decide
>> whether it wants to be enabled/disabled by default.
>>
>> If everyone agrees on this approach and likes it, should we push this
>> into 2.6.25?
> 
> First I like the change to make it disabled by default.
> 
> I don't think "toggle" is good semantics for a user visible switch
> because that changes the meaning when the kernel default changes
> (which it will likely once the current default overhead is fixed)
> 
> It should be rather: cgroup=on/off 
> 

The boot control options apply to all controllers and we want to allow
controllers to decide whether they should be turned on or off. With sufficient
documentation support in Documentation/kernel-parameters.txt, don't you think we
can expect this to work as the user intended?

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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