From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759732AbYGJR0b (ORCPT ); Thu, 10 Jul 2008 13:26:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758388AbYGJR0F (ORCPT ); Thu, 10 Jul 2008 13:26:05 -0400 Received: from wolverine01.qualcomm.com ([199.106.114.254]:37396 "EHLO wolverine01.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757993AbYGJR0E (ORCPT ); Thu, 10 Jul 2008 13:26:04 -0400 X-IronPort-AV: E=McAfee;i="5200,2160,5335"; a="4605558" Message-ID: <4876462A.6050004@qualcomm.com> Date: Thu, 10 Jul 2008 10:26:02 -0700 From: Max Krasnyansky User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: Paul Menage CC: a.p.zijlstra@chello.nl, pj@sgi.com, vegard.nossum@gmail.com, linux-kernel@vger.kernel.org Subject: Re: [RFC][PATCH] CGroups: Add a per-subsystem hierarchy lock References: <20080627075912.92AE43D6907@localhost> <6599ad830806271702y2c1df2edh3a75dda75336ddad@mail.gmail.com> <486AFC33.7010901@qualcomm.com> <6599ad830807021531r16013460re28f813be8293d6c@mail.gmail.com> <486C59BE.3020400@qualcomm.com> In-Reply-To: <486C59BE.3020400@qualcomm.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Max Krasnyansky wrote: > > Paul Menage wrote: >> On Tue, Jul 1, 2008 at 8:55 PM, Max Krasnyansky 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