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

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

>From: Xu,Anthony
>Sent: 2006年4月4日 23:36
>>> 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.
>Vcpu1 also doesn't wait vcpu2 by using IPI, is here any issue?

First, I'm not sure the exact trouble for IPI with migration, which should be 
same for all approaches if there.

Then, I think things may become more complex if vcpu1 doesn't wait for 
other vcpus to complete the purge emulation. You need to consider race 
conditions since multiple emulation requests may exist at same time if 
previous ptc.ga emulation returns before completion.

Thanks,
Kevin

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