Re: [Xen-devel] Vcpu allocation for a newly created domU

[Sandesh <sandesh.ahiremath@xxxxxxxxx>]

> >> smp_processor_id() and current->processor should match in
> >> __context_switch().
> > need not be..cant the scheduler schedule the vcpu on a cpu other than
> > the cpu its currently running on...??
> 
> When you enter the scheduler (and also __context_switch) you are  
> running VCPU=current on CPU=smp_processor_id().
this is true only if current is not set to the next vcpu. but if you
look at context_switch() just before calling __context_switch ,
set_curent(next) is done. At this point current is actually the next
vcpu to be scheduled. 

>  At this point in time  
> current->processor and smp_processor_id() will match.
So vcpu->processor need not match smp_processor_id()....

Thanks, 
  Sandesh


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