linux-kernel - Re: [PATCH 2/2] mm, memcg: Optionally disable memcg by default using Kconfig

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Message-ID: <1432129666.15239.22.camel@stgolabs.net>
Date:	Wed, 20 May 2015 06:47:46 -0700
From:	Davidlohr Bueso <dave@...olabs.net>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>,
	Linux-CGroups <cgroups@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] mm, memcg: Optionally disable memcg by default
 using Kconfig

On Wed, 2015-05-20 at 13:50 +0100, Mel Gorman wrote:
> +config MEMCG_DEFAULT_ENABLED
> +	bool "Automatically enable memory resource controller"
> +	default y
> +	depends on MEMCG
> +	help
> +	  The memory controller has some overhead even if idle as resource
> +	  usage must be tracked in case a group is created and a process
> +	  migrated. As users may not be aware of this and the cgroup_disable=
> +	  option, this config option controls whether it is enabled by
> +	  default. It is assumed that someone that requires the controller
> +	  can find the cgroup_enable= switch.
> +
> +	  Say N if unsure. This is default Y to preserve oldconfig and
> +	  historical behaviour.

Out of curiosity, how do you expect distros to handle this? I mean, this
is a pretty general functionality and customers won't want to be
changing kernels (they may or may not use memcg). iow, will this ever be
disabled?

Thanks,
Davidlohr

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