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    SubjectRe: cgroup: rmdir() does not complete
    On Fri, 27 Aug 2010 12:39:48 +0900
    Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> wrote:

    > On Fri, 27 Aug 2010 11:35:06 +0900
    > KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:
    >
    > > On Fri, 27 Aug 2010 09:56:39 +0900
    > > Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> wrote:
    > >
    > > > > Or is it likely to be some other cause, and how best to find it?
    > > > >
    > > > What cgroup subsystem did you mount where the directory existed you tried
    > > > to rmdir() first ?
    > > > If you mounted several subsystems on the same hierarchy, can you mount them
    > > > separately to narrow down the cause ?
    > > >
    > >
    > > It seems I can reproduce the issue on mmotm-0811, too.
    > >
    > > try this.
    > >
    > > Here, memory cgroup is mounted at /cgroups.
    > > ==
    > > #!/bin/bash -x
    > >
    > > while sleep 1; do
    > > date
    > > mkdir /cgroups/test
    > > echo 0 > /cgroups/test/tasks
    > > echo 300M > /cgroups/test/memory.limit_in_bytes
    > > cat /proc/self/cgroup
    > > dd if=/dev/zero of=./tmpfile bs=4096 count=100000
    > > echo 0 > /cgroups/tasks
    > > cat /proc/self/cgroup
    > > rmdir /cgroups/test
    > > rm ./tmpfile
    > > done
    > > ==
    > >
    > > hangs at rmdir. I'm no investigating force_empty.
    > >
    > Thank you very much for your information.
    >
    > Some questions.
    >
    > Is "tmpfile" created on a normal filesystem(e.g. ext3) or tmpfs ?
    on ext4.

    > And, how long does it likely to take to cause this problem ?

    very soon. 10-20 loop.

    > I've run it on RHEL6-based kernel/ext3 for about one hour, but
    > I cannot reproduce it yet.
    >

    Hmm...I'll dig more. Maybe I need to use stock kernel rather than -mm...


    Thanks,
    -Kame



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