From mboxrd@z Thu Jan 1 00:00:00 1970 From: George Dunlap Subject: Re: Re: [Xen-users] Xen 4.1.1 crash when manipulating cpupools. Date: Mon, 14 Nov 2011 11:13:06 +0000 Message-ID: <1321269186.14063.6.camel@elijah> References: <553832861.1721802.1321046283027.JavaMail.root@sz0032a.westchester.pa.mail.comcast.net> <4EC0DD6A.7040007@ts.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4EC0DD6A.7040007@ts.fujitsu.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Juergen Gross Cc: George Dunlap , "xen-devel@lists.xensource.com" , "xen-users@lists.xensource.com" , "andrewpitman@comcast.net" List-Id: xen-devel@lists.xenproject.org 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? > > - removing a cpu from a cpupool seems not to work for credit2. I > removed all > but cpu 0 from Pool-0 and the dom0 vcpus were all active on cpus > 1-3. It > took some time until they moved to cpu 0 (verified via 'r' hotkey on > the > xen console). > > I tested on xen-4.1-testing cs 23182. > > > 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