Re: [Xen-devel] Re: [Xen-users] Xen 4.1.1 crash when manipulatin

To:	George Dunlap <george.dunlap@xxxxxxxxxx>
Subject:	Re: [Xen-devel] Re: [Xen-users] Xen 4.1.1 crash when manipulating cpupools.
From:	Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>
Date:	Mon, 14 Nov 2011 12:27:41 +0100
Cc:	George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>, "andrewpitman@xxxxxxxxxxx" <andrewpitman@xxxxxxxxxxx>
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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@xxxxxxxxxxx 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@xxxxxxxxxxxxxx
Domagkstr. 28                           Internet: ts.fujitsu.com
D-80807 Muenchen                 Company details: ts.fujitsu.com/imprint.html


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Re: [Xen-devel] Re: [Xen-users] Xen 4.1.1 crash when manipulating cpupoo