linux-kernel - Re: [PATCH 7/7] cgroups: Update documentation for bindable subsystems

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Message-Id: <20101025093617.7de750c0.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 25 Oct 2010 09:36:17 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	"akpm >> Andrew Morton" <akpm@...ux-foundation.org>,
	containers@...ts.linux-foundation.org,
	Paul Menage <menage@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 7/7] cgroups: Update documentation for bindable
 subsystems

On Fri, 22 Oct 2010 16:12:25 +0800
Li Zefan <lizf@...fujitsu.com> wrote:

> Provide a usage example, and update the bind() callback API.
> 
> Signed-off-by: Li Zefan <lizf@...fujitsu.com>
> ---
>  Documentation/cgroups/cgroups.txt |   26 +++++++++++++++++---------
>  1 files changed, 17 insertions(+), 9 deletions(-)
> 
> diff --git a/Documentation/cgroups/cgroups.txt b/Documentation/cgroups/cgroups.txt
> index 190018b..5b5382a 100644
> --- a/Documentation/cgroups/cgroups.txt
> +++ b/Documentation/cgroups/cgroups.txt
> @@ -363,17 +363,23 @@ Note this will add ns to the hierarchy but won't remove memory or
>  cpuset, because the new options are appended to the old ones:
>  # mount -o remount,ns /dev/cgroup
>  
> +For some subsystems you can bind them to a mounted hierarchy or
> +remove them from it, even if there're sub-cgroups in it:
> +# mount -t cgroup -o freezer hier1 /dev/cgroup
> +# echo $$ > /dev/cgroup/my_cgroup
> +# mount -o freezer,cpuset hier1 /dev/cgroup
> +(failed)
> +# mount -o freezer,cpuacct hier1 /dev/cgroup
> +# mount -o cpuacct hier1 /dev/cgroup
> +
> +Note cpuacct should be sit in the default hierarchy before remount.
> +

Can this operation be used with noop cgroup ?
(IOW, perf cgroup can be attached to noop cgroup ?)

Thanks,
-Kame

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