From mboxrd@z Thu Jan 1 00:00:00 1970 From: Juergen Gross Subject: Re: Re: [Xen-users] Xen 4.1.1 crash when manipulating cpupools. Date: Mon, 14 Nov 2011 12:27:41 +0100 Message-ID: <4EC0FB2D.6020905@ts.fujitsu.com> References: <553832861.1721802.1321046283027.JavaMail.root@sz0032a.westchester.pa.mail.comcast.net> <4EC0DD6A.7040007@ts.fujitsu.com> <1321269186.14063.6.camel@elijah> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1321269186.14063.6.camel@elijah> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: George Dunlap Cc: George Dunlap , "xen-devel@lists.xensource.com" , "xen-users@lists.xensource.com" , "andrewpitman@comcast.net" List-Id: xen-devel@lists.xenproject.org On 11/14/2011 12:13 PM, George Dunlap wrote: > On Mon, 2011-11-14 at 09:20 +0000, Juergen Gross wrote: >> On 11/11/2011 10:18 PM, andrewpitman@comcast.net wrote: >>> Juergen, >>> >>> It doesn't look like this has been fixed. I managed to get my 4.1.2 >>> server to crash when setting the weight of Domain-0 (running in >>> Pool-0 using credit2) and again when moving some cpus into a new >>> cpupool which was set up to use the credit2 scheduler. >>> >> Yeah, I could reproduce your problems on my machine. >> >> George, I see two problems in credit2: >> >> - when setting the weight of dom0, vcpu_schedule_lock_irq(current) >> will be >> taken in sched_adjust() of schedule.c and again in csched_dom_cntl() >> of >> sched_credit2.c resulting in a deadlock. > Yes, this one was recently brought to my attention. Unfortunately I'm > not sure when I'm going to be able to get to it. > > My big problem is actually testing; I don't have a good way to test > xen-unstable effectively right now. Juergen, if I were to send you a > prototype patch, could you test it and fix it up if it doesn't work > exactly right? Sure. Juergen -- Juergen Gross Principal Developer Operating Systems PDG ES&S SWE OS6 Telephone: +49 (0) 89 3222 2967 Fujitsu Technology Solutions e-mail: juergen.gross@ts.fujitsu.com Domagkstr. 28 Internet: ts.fujitsu.com D-80807 Muenchen Company details: ts.fujitsu.com/imprint.html