From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751728Ab0JYAzt (ORCPT ); Sun, 24 Oct 2010 20:55:49 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:53760 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751470Ab0JYAzs (ORCPT ); Sun, 24 Oct 2010 20:55:48 -0400 Message-ID: <4CC4D5CA.3080409@cn.fujitsu.com> Date: Mon, 25 Oct 2010 08:56:42 +0800 From: Li Zefan User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1b3pre) Gecko/20090513 Fedora/3.0-2.3.beta2.fc11 Thunderbird/3.0b2 MIME-Version: 1.0 To: KAMEZAWA Hiroyuki CC: "akpm >> Andrew Morton" , containers@lists.linux-foundation.org, Paul Menage , LKML , Stephane Eranian 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> <4CC4D4B9.3020807@cn.fujitsu.com> In-Reply-To: <4CC4D4B9.3020807@cn.fujitsu.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Li Zefan wrote: > KAMEZAWA Hiroyuki wrote: >> On Fri, 22 Oct 2010 16:12:25 +0800 >> Li Zefan wrote: >> >>> Provide a usage example, and update the bind() callback API. >>> >>> Signed-off-by: Li Zefan >>> --- >>> 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. But, wait. It stuck when I moved a task from a sub-cgroup to the root. Need to dig more..