Re: [Xen-devel] RTDS with extra time issue

[Dario Faggioli <dfaggioli@xxxxxxxx>]

On Fri, 2018-02-09 at 23:53 -0500, Meng Xu wrote:
> > 
> > Perhaps Meng has some more ideas on this as well. :-)
> 
> If the RT VCPU has only one RT task on it, we can synchronize the
> release time of the VCPU and that of the RT task. In other words, the
> release offset of both the VCPU and the RT task are the same in terms
> of the wall clock. Then we can assign the task's parameter to the
> VCPU
> and guarantee the task has no deadline miss if the VCPU has no
> deadline miss.
> However, this observation only works when the assumption that one
> VCPU
> has only one task in the RT domain. I'm not sure how practical it is
> because the observation cannot be generalized for multiple tasks on
> one VCPU.
> 
> Andrii and Dario,
> Do you think the assumption that one VCPU runs only one RT task is
> reasonable in practice?
> If it is, is there some use cases for this assumption?
> 
Well, I'll let Andrii reply, but honestly, I don't think it is.

See, for instance, the fact that DomR has only 1 vCPU, so I find it
unlikely that the only thing that run there is *just* *one* real-time
task. :-/

Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
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Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Software Engineer @ SUSE https://www.suse.com/

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