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Date: Mon, 25 Oct 2010 08:52:09 +0800
From: Li Zefan <lizf@cn.fujitsu.com>
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To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
CC: "akpm >> Andrew Morton" <akpm@linux-foundation.org>,
        containers@lists.linux-foundation.org, Paul Menage <menage@google.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Stephane Eranian <eranian@google.com>
Subject: Re: [PATCH 7/7] cgroups: Update documentation for bindable subsystems
References: <4CC146A4.9090505@cn.fujitsu.com>	<4CC14769.2000406@cn.fujitsu.com> <20101025093617.7de750c0.kamezawa.hiroyu@jp.fujitsu.com>
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KAMEZAWA Hiroyuki wrote:
> On Fri, 22 Oct 2010 16:12:25 +0800
> Li Zefan <lizf@cn.fujitsu.com> wrote:
> 
>> Provide a usage example, and update the bind() callback API.
>>
>> Signed-off-by: Li Zefan <lizf@cn.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 ?)
> 

Yes, you can. I've tested it.