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

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Message-ID: <47FA10BB.9000305@linux.vnet.ibm.com>
Date:	Mon, 07 Apr 2008 17:46:59 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KOSAKI Motohiro <m-kosaki@...es.dti.ne.jp>
CC:	Andi Kleen <andi@...stfloor.org>,
	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

KOSAKI Motohiro wrote:
>>  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?
> 
> 2 parameter is wrong?
> 
>        cgroup_disable= [KNL] Disable a particular controller
>                        Format: {name of the controller(s) to disable}
>        cgroup_enable= [KNL] Enable a particular controller
>                        Format: {name of the controller(s) to enable}
> 

No, it is not all bad. That can be done, but we need to guard against a usage like

cgroup_disable=memory cgroup_enable=memory

The user will probably get what he/she deserves for it.

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