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

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Date:	Wed, 02 Jul 2008 21:46:54 -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



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.

Max

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