linux-kernel - Re: cgroup: rmdir() does not complete

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Date:	Thu, 09 Sep 2010 13:50:17 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mark Hills <mark@...o.org.uk>
Cc:	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	linux-kernel@...r.kernel.org
Subject: Re: cgroup: rmdir() does not complete

On Thu, 2010-09-09 at 12:36 +0100, Mark Hills wrote:

> I am still finding the problem incredibly hard to reproduce, so I'd like 
> to observe as much data as possible from the current case before 
> rebooting. If I could capture some kind of stack trace in the kernel for 
> the running process that would be great, any suggestions appreciated.

echo l > /proc/sysrq-trigger

another thing you can do is run something like: perf record -gp $pid
which will give you a profile of that task.
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