linux-kernel - Re: [RFC][PATCH] CGroups: Add a per-subsystem hierarchy lock

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Message-ID: <4876462A.6050004@qualcomm.com>
Date:	Thu, 10 Jul 2008 10:26:02 -0700
From:	Max Krasnyansky <maxk@...lcomm.com>
To:	Paul Menage <menage@...gle.com>
CC:	a.p.zijlstra@...llo.nl, pj@....com, vegard.nossum@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] CGroups: Add a per-subsystem hierarchy lock



Max Krasnyansky wrote:
> 
> Paul Menage wrote:
>> On Tue, Jul 1, 2008 at 8:55 PM, Max Krasnyansky <maxk@...lcomm.com> wrote:
>>> I was about to say "yeah, looks good" and then tried a couple of
>>> different hot-plug scenarious.
>>> We still have circular locking even with your patch
>>>
>> What sequence of actions do you do? I've not been able to reproduce a
>> lockdep failure.
> 
> mkdir /dev/cpuset
> mount -t cgroup -o cpuset cpuset /dev/cpuset
> mkdir /dev/cpuset/0
> mkdir /dev/cpuset/1
> echo 0-2 > /dev/cpuset/0/cpuset.cpus
> echo 3   > /dev/cpuset/1/cpuset.cpus
> echo 0 > /dev/cpuset/cpuset.sched_load_balance
> echo 0 > /sys/devices/system/cpu/cpu3/online
> 
> I just tried it again and got exact same lockdep output that I sent before.

Paul, any luck with that ?

Max
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