if /sys/fs/cgroup mounted as readonly, try to remount as rw
> Date: Thu, 24 Mar 2016 12:51:40 +0800
> From: jian.f...@alibaba-inc.com
> To: dev@slider.incubator.apache.org
> Subject: 回复：how to enabling cgroups on RHEL7
>
> this is redhat6, redhat7 does not use libcgroup anymore
