Re: [LTP] [PATCH] New core test of cgroups and extended attributes

From: chrubis@suse.cz
To: Alexey Kodanev <alexey.kodanev@oracle.com>
Cc: vasily.isaenko@oracle.com, ltp-list@lists.sourceforge.net
Subject: Re: [LTP] [PATCH] New core test of cgroups and extended attributes
Date: Thu, 23 May 2013 15:31:48 +0200	[thread overview]
Message-ID: <20130523133148.GB22501@rei.suse.cz> (raw)
In-Reply-To: <1369292997-10921-1-git-send-email-alexey.kodanev@oracle.com>

Hi!
> Support of extended attributes in cgroups was added in Linux 3.7.

I've tried to run the test on my machine where cgroups are allready
mounted to /sys/fs/cgroup (which seems to be the case for modern
distributions). In such situation the mount in the test fails with
EBUSY. I looks like the root hierarchy can be mounted only once. Now we
cannot unmout the /sys/fs/cgroup as this one is used by the system.

But it looks like we can mount each of the controllers, i.e.

for each controller:
	mkdir /path/type
	mount -t cgroup -o type type /path/type

So the options are either to use the /sys/fs/cgroup directory or mount
each controller one by one.

What do you think?

-- 
Cyril Hrubis
chrubis@suse.cz

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