From: Balbir Singh <balbir@linux.vnet.ibm.com>
To: Mark Hills <mark@pogo.org.uk>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>,
linux-kernel@vger.kernel.org
Subject: Re: cgroup: rmdir() does not complete
Date: Thu, 9 Sep 2010 15:39:09 +0530 [thread overview]
Message-ID: <20100909100909.GM4443@balbir.in.ibm.com> (raw)
In-Reply-To: <alpine.NEB.2.01.1009091051400.17759@jrf.vwaro.pbz>
* Mark Hills <mark@pogo.org.uk> [2010-09-09 11:01:45]:
> On Thu, 2 Sep 2010, KAMEZAWA Hiroyuki wrote:
>
> [...]
> > But hmm...it's curious who holds mutex and what happens.
>
> I have a system showing the failure case (but still do not have a way to
> reliably repeat it)
>
> Here are the two processes:
>
> 23586 pts/0 RL+ 5059:18 /net/homes/mhills/tmp/soaked-cgroup
> 23685 pts/6 DL+ 0:00 /net/homes/mhills/tmp/soaked-cgroup
>
> 23586 spends almost all of its time in 'RL+' status, occasionally it is
> seen in 'DL+' status.
>
> From my analysis before, both are blocked on rmdir(), but one is spinning,
> holding the lock on the /cgroup, and the other is waiting for the lock. If
> I strace 23586 then the rmdir() fails with EINTR.
>
Any chance you can compile with debug cgroup subsystem and get
information from there?
--
Three Cheers,
Balbir
next prev parent reply other threads:[~2010-09-09 10:09 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-26 15:51 Mark Hills
2010-08-27 0:56 ` Daisuke Nishimura
2010-08-27 1:20 ` Balbir Singh
2010-08-27 2:35 ` KAMEZAWA Hiroyuki
2010-08-27 3:39 ` Daisuke Nishimura
2010-08-27 5:42 ` KAMEZAWA Hiroyuki
2010-08-27 6:29 ` KAMEZAWA Hiroyuki
2010-08-30 7:32 ` Balbir Singh
2010-08-30 9:13 ` Mark Hills
2010-09-01 11:10 ` Mark Hills
2010-09-01 23:42 ` KAMEZAWA Hiroyuki
2010-09-02 9:45 ` Mark Hills
2010-09-09 10:01 ` Mark Hills
2010-09-09 10:09 ` Balbir Singh [this message]
2010-09-09 11:36 ` Mark Hills
2010-09-09 11:50 ` Peter Zijlstra
2010-09-09 23:04 ` Mark Hills
2010-09-09 23:43 ` KAMEZAWA Hiroyuki
2010-09-10 2:16 ` KAMEZAWA Hiroyuki
2010-09-10 4:05 ` Daisuke Nishimura
2010-09-10 4:11 ` KAMEZAWA Hiroyuki
2010-09-10 7:28 ` Mark Hills
2010-09-10 7:33 ` KAMEZAWA Hiroyuki
2010-09-10 7:51 ` Mark Hills
2010-08-27 1:25 ` KAMEZAWA Hiroyuki
2010-08-30 9:25 ` Mark Hills
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