Re: [Xen-devel] [PATCH for 4.7 0/4] Assorted scheduling fixes

[Julien Grall <julien.grall@xxxxxxx>]

Hi Dario,

On 04/05/16 10:06, Dario Faggioli wrote:
> On Tue, 2016-05-03 at 21:26 -0400, Konrad Rzeszutek Wilk wrote:
> > On Tue, May 03, 2016 at 11:46:27PM +0200, Dario Faggioli wrote:
> > > Julien, the patch is very very similar to the one attached to one
> > > of my reply
> > > in that thread, but I had to change some small bits... Can you
> > > please re-test
> > > it?
> > I tested it. It does not crash anymore. However I see this:
> On what hardware/emulator? The same Julien was using?
> > (XEN) CPU1 never came online
> > (XEN) Failed to bring up CPU 1 (error -5)
> > (XEN) Bringing up CPU2
> > (XEN) CPU2 never came online
> > (XEN) Failed to bring up CPU 2 (error -5)
> > (XEN) Bringing up CPU3
> > (XEN) CPU3 never came online
> > (XEN) Failed to bring up CPU 3 (error -5)
> > (XEN) Brought up 1 CPUs
> >
> >
> > Which is not very reassuring. I don't know if that is expected.
> I don't know... I've never said this on any x86 box before, and I
> wouldn't think it to be related to this series... do you see this only
> with the series applied?
Xen ARM doesn't wait indefinitely a secondary CPU to come online. 
Instead, if it isn't online after a 1s, it will be skipped.
This could happen on the Foundation Model if the number of cores given 
on the model command line, handled by the firmware and described in the 
device tree don't match each other.
Cheers,

--
Julien Grall

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