Re: [Xen-devel] [PATCH v4 2/4] xen/sched: remove cpu from pool0 before removing it

[Dario Faggioli <dfaggioli@xxxxxxxx>]

On Sat, 2019-09-14 at 07:19 +0200, Juergen Gross wrote:
> Today a cpu which is removed from the system is taken directly from
> Pool0 to the offline state. This will conflict with the new idle
> scheduler, so remove it from Pool0 first. Additionally accept
> removing
> a free cpu instead of requiring it to be in Pool0.
> 
> For the resume failed case we need to call the scheduler code for
> that
> situation after the cpupool handling, so move the scheduler code into
> a function and call it from cpupool_cpu_remove_forced() and remove
> the
> CPU_RESUME_FAILED case from cpu_schedule_callback().
> 
> Note that we are calling now schedule_cpu_switch() in stop_machine
> context so we need to switch from spinlock_irq to spinlock_irqsave.
> 
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> ---
> V2: rename cpupool_unassign_cpu_[epi|pro]logue() (Dario Faggioli)
> V4: fix bug when unassigning cpu not in pool
>
Reviewed-and-Tested-by: Dario Faggioli <dfaggioli@xxxxxxxx>

Regards
-- 
Dario Faggioli, Ph.D
http://about.me/dario.faggioli
Virtualization Software Engineer
SUSE Labs, SUSE https://www.suse.com/
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