linux-kernel - Re: [Suggestion] kernel: cgroup: mount failure in LTP cgroup_regression

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Message-ID: <20131120173549.GO28946@htj.dyndns.org>
Date:	Wed, 20 Nov 2013 12:35:49 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Chen Gang <gang.chen@...anux.com>
Cc:	Li Zefan <lizefan@...wei.com>,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Suggestion] kernel: cgroup: mount failure in LTP
 cgroup_regression_test.sh

Hello,

Sorry about the delay.

On Fri, Nov 08, 2013 at 04:15:23PM +0800, Chen Gang wrote:
> After simplify, the related operation, environments and output are:
> 
>   [root@...enlinux tmp]# df -Th | grep cgroup
>   tmpfs                             tmpfs    1001M     0 1001M   0% /sys/fs/cgroup
>   [root@...enlinux tmp]# lsof | grep cgroup | grep -v grep
>   systemd       1          root    6r      DIR               0,18         0       5998 /sys/fs/cgroup/systemd/system
>   [root@...enlinux tmp]# cat /proc/cgroups 
>   #subsys_name	hierarchy	num_cgroups	enabled
>   cpuset	3	4	1
>   cpu	4	35	1
>   cpuacct	4	35	1
>   freezer	5	4	1
>   [root@...enlinux tmp]# mkdir cgroup
>   [root@...enlinux tmp]# mount -t cgroup -o freezer,cpuacct xxx cgroup/
>   mount: xxx already mounted or cgroup/ busy
> 
> Is it real issue of cgroup? If it is, I will/should continue analyzing.

Hmmm... I'm a bit confused.  What is it testing?  "cat /proc/cgroup"
is showing that freezer is already mounted and the kernel seems to
have correctly refused to mount it in a different hierarchy.  What am
I missing here?

Thanks.

-- 
tejun
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