Re: [Xen-devel] [PATCH] SEDF: avoid gathering vCPU-s on pCPU0

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Fri, 2013-03-01 at 15:35 +0000, Jan Beulich wrote:
> The introduction of vcpu_force_reschedule() in 14320:215b799fa181 was
> incompatible with the SEDF scheduler: Any vCPU using
> VCPUOP_stop_periodic_timer (e.g. any vCPU of half way modern PV Linux
> guests) ends up on pCPU0 after that call. Obviously, running all PV
> guests' (and namely Dom0's) vCPU-s on pCPU0 causes problems for those
> guests rather sooner than later.
> 
> So the main thing that was clearly wrong (and bogus from the beginning)
> was the use of cpumask_first() in sedf_pick_cpu(). It is being replaced
> by a construct that prefers to put back the vCPU on the pCPU that it
> got launched on.
> 

Is this change at all related to the long standing failure to boot with
sedf in the test harnesss?



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