linux-kernel - Re: [PATCH v5 14/14] Add documentation about the kmem controller

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Message-ID: <20121016122324.GG13991@dhcp22.suse.cz>
Date:	Tue, 16 Oct 2012 14:23:24 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Glauber Costa <glommer@...allels.com>
Cc:	linux-mm@...ck.org, cgroups@...r.kernel.org,
	Mel Gorman <mgorman@...e.de>, Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	kamezawa.hiroyu@...fujitsu.com, Christoph Lameter <cl@...ux.com>,
	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...nel.org>, devel@...nvz.org,
	linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...hat.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Suleiman Souhlal <suleiman@...gle.com>
Subject: Re: [PATCH v5 14/14] Add documentation about the kmem controller

On Tue 16-10-12 14:16:51, Glauber Costa wrote:
> Signed-off-by: Glauber Costa <glommer@...allels.com>
> CC: Frederic Weisbecker <fweisbec@...hat.com>
> CC: Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> CC: Michal Hocko <mhocko@...e.cz>
> CC: Christoph Lameter <cl@...ux.com>
> CC: Pekka Enberg <penberg@...helsinki.fi>
> CC: Johannes Weiner <hannes@...xchg.org>
> CC: Suleiman Souhlal <suleiman@...gle.com>
> CC: Tejun Heo <tj@...nel.org>

Acked-by: Michal Hocko <mhocko@...e.cz

Just a nit..
> ---
>  Documentation/cgroups/memory.txt | 58 +++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 57 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
> index c07f7b4..dd15be8 100644
> --- a/Documentation/cgroups/memory.txt
> +++ b/Documentation/cgroups/memory.txt
[...]
> @@ -268,20 +273,65 @@ the amount of kernel memory used by the system. Kernel memory is fundamentally
>  different than user memory, since it can't be swapped out, which makes it
>  possible to DoS the system by consuming too much of this precious resource.
>  
> +Kernel memory won't be accounted at all until limit on a group is set. This
> +allows for existing setups to continue working without disruption.  The limit
> +cannot be set if the cgroup have children, or if there are already tasks in the
> +cgroup. When use_hierarchy == 1 and a group is accounted, its children will
> +automatically be accounted regardless of their limit value.
> +
> +After a controller is first limited, it will be kept being accounted until it

s/controller/group/

> +is removed. The memory limitation itself, can of course be removed by writing
> +-1 to memory.kmem.limit_in_bytes. In this case, kmem will be accounted, but not
> +limited.
> +

-- 
Michal Hocko
SUSE Labs
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