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Date: Fri, 4 Apr 2014 08:22:59 -0400
From: Tejun Heo <tj@...nel.org>
To: Li Zefan <lizefan@...wei.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
David Miller <davem@...emloft.net>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linux Containers <containers@...ts.linux-foundation.org>,
cgroups@...r.kernel.org
Subject: Re: [GIT PULL] cgroup changes for v3.15-rc1
On Fri, Apr 04, 2014 at 05:14:41PM +0800, Li Zefan wrote:
> [PATCH] cgroup: fix top cgroup refcnt leak
>
> As mount() and kill_sb() is not a one-to-one match, If we mount the same
> cgroupfs in serveral mount points, and then umount all of them, kill_sb()
> will be called only once.
>
> Try:
> # mount -t cgroup -o cpuacct xxx /cgroup
> # mount -t cgroup -o cpuacct xxx /cgroup2
> # cat /proc/cgroups | grep cpuacct
> cpuacct 2 1 1
> # umount /cgroup
> # umount /cgroup2
> # cat /proc/cgroups | grep cpuacct
> cpuacct 2 1 1
>
> You'll see cgroupfs will never be freed.
>
> Signed-off-by: Li Zefan <lizefan@...wei.com>
Applied to cgroup/for-3.15-fixes.
Thanks.
--
tejun
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