Messages in this thread | | | Date | Fri, 27 Aug 2010 14:42:25 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: cgroup: rmdir() does not complete |
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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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