linux-kernel - Re: [PATCH] memcg: clarify use

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Message-Id: <20110217104932.9e2c741b.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 17 Feb 2011 10:49:32 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Greg Thelen <gthelen@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Randy Dunlap <rdunlap@...otime.net>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Jiri Kosina <jkosina@...e.cz>, linux-mm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] memcg: clarify use_hierarchy documentation

On Wed, 16 Feb 2011 17:51:23 -0800
Greg Thelen <gthelen@...gle.com> wrote:

> The memcg code does not allow changing memory.use_hierarchy if the
> parent cgroup has enabled use_hierarchy.  Update documentation to match
> the code.
> 
> Signed-off-by: Greg Thelen <gthelen@...gle.com>

Thank you,
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Because I tend to read linux-mm list 1st, I'm glad if you CC linux-mm in
the next time.

> ---
>  Documentation/cgroups/memory.txt |    5 +++--
>  1 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
> index 7781857..b6ed61c 100644
> --- a/Documentation/cgroups/memory.txt
> +++ b/Documentation/cgroups/memory.txt
> @@ -485,8 +485,9 @@ The feature can be disabled by
>  
>  # echo 0 > memory.use_hierarchy
>  
> -NOTE1: Enabling/disabling will fail if the cgroup already has other
> -       cgroups created below it.
> +NOTE1: Enabling/disabling will fail if either the cgroup already has other
> +       cgroups created below it, or if the parent cgroup has use_hierarchy
> +       enabled.
>  
>  NOTE2: When panic_on_oom is set to "2", the whole system will panic in
>         case of an OOM event in any cgroup.
> -- 
> 1.7.3.1
> 
> 

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