On 2013/9/3 20:05, Dhaval Giani wrote:
> On Fri, Aug 2, 2013 at 4:24 AM, Weng Meiling
> <wengmeiling.w...@huawei.com> wrote:
>>
>> From: Weng Meiling <wengmeiling.w...@huawei.com>
>>
>> When we use cgclear to unload the cgroup filesystem, we still can
>> see the umounted cgroup by using mount command. So fix the problem
>> by call system.
>>
>> From: Weng Meiling <wengmeiling.w...@huawei.com>
> 
> NAK
> 
> umount system call is the documented way to unmount a filesystem. I
> would like some more investigation as to why this is happening? Can
> you try seeing if you see this behavior with a tmpfs as well? And with
> other filesystems? Is it something that is limited cgroupfs? Does
> using umount2 with MNT_DETACH help after a whlie?
> 
> Thanks!
> Dhaval
> 
> 
This happens only when mount cgroupfs using mount command not cgconfig
service or cgconfigparser. Because when using mount command, it will update the
/etc/mtab file to record the mounted filesystem. When using cgclear to unload
the cgroupfs, it uses umount2, but the syscall doesn't update the /etc/mtab to
removed the umouted filesystem. So the patch try to using umount8 which will
update the /etc/mtab. The same as other filesystem if they use umount2 to umount
the filesystem.

Thanks!
Weng Meiling


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