Re: [Xen-devel] Hypervisor crash(!) on xl cpupool-numa-split

[Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>]

On 02/09/11 15:21, Juergen Gross wrote:
> Andre, George,
>
>
> What seems to be interesting: I think the problem did always occur when
> a new cpupool was created and the first cpu was moved to it.
>
> I think my previous assumption regarding the master_ticker was not too bad.
> I think somehow the master_ticker of the new cpupool is becoming active
> before the scheduler is really initialized properly. This could happen, if
> enough time is spent between alloc_pdata for the cpu to be moved and the
> critical section in schedule_cpu_switch().
>
> The solution should be to activate the timers only if the scheduler is
> ready for them.
>
> George, do you think the master_ticker should be stopped in suspend_ticker
> as well? I still see potential problems for entering deep C-States. I think
> I'll prepare a patch which will keep the master_ticker active for the
> C-State case and migrate it for the schedule_cpu_switch() case.
Okay, here is a patch for this. It ran on my 4-core machine without any
problems.
Andre, could you give it a try?


Juergen

--
Juergen Gross                 Principal Developer Operating Systems
TSP ES&S SWE OS6                       Telephone: +49 (0) 89 3222 2967
Fujitsu Technology Solutions              e-mail: juergen.gross@xxxxxxxxxxxxxx
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