On 2013/9/4 20:25, Dhaval Giani wrote: > On Tue, Sep 3, 2013 at 9:43 PM, Weng Meiling > <wengmeiling.w...@huawei.com> wrote: >> 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. > > As long as /proc/mounts is correct, we don't have a problem. In > anycase, /etc/mtab is not the correct way to check mounted > filesystems. It is always /proc/mounts. > > This patch is unnecessary (and dangerous) > > Thanks! > Dhaval > > OK, i see, thanks!
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