Re: [Xen-ia64-devel] RFC: ptc.ga implementation for SMP-g

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Le Mardi 04 Avril 2006 17:36, Xu, Anthony a écrit :
> From: Tristan Gingold
[...]
> >> And as you said IPI may cause trouble when considering migration.
> >> If above method is feasible, I prefer this one.
> >
> >How to be sure the time window is not too long ?
> >vcpu1 must waits for vcpu2.
>
> Sorry for not clear, IMO vcpu1 doesn't need to wait vcpu2.
I don't think so.  This is not the specification. 
If vcpu1 doesn't wait vcpu2, there may be several ptc.ga in flight, which is 
not an easy task.

> Vcpu1 also doesn't wait vcpu2 by using IPI, is here any issue?
The linux/xen smp_call_function_single has a wait flag.

Tristan.



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