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Re: [Xen-devel] Re: [Xen-users] Xen 4.1.1 crash when manipulating cpupools.
- To: andrewpitman@xxxxxxxxxxx, George Dunlap <george.dunlap@xxxxxxxxxxxxx>
- From: Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>
- Date: Mon, 14 Nov 2011 10:58:18 +0100
- Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 14 Nov 2011 02:02:47 -0800
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On 11/14/2011 10:20 AM, 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.
- 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).
IMO the problem is choose_cpu() not using CSCHED_CPUONLINE(). The
comment
 /* Leave it where it is for now. When we actually pay
attention
ÂÂÂÂÂÂÂÂ * to affinity we'll have to figure something out... */
suggests the solution isn't too easy...
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
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