Re: [GIT PULL] cgroup changes for v3.15-rc1

[Tejun Heo]

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@xxxxxxxxxx>

Applied to cgroup/for-3.15-fixes.

Thanks.

-- 
tejun
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