Re: [Xen-devel] [PATCH v10 6/7] vmx: VT-d posted-interrupt core logic handling

[Dario Faggioli <dario.faggioli@xxxxxxxxxx>]

On Wed, 2016-01-20 at 04:35 -0700, Jan Beulich wrote:
> > > > On 20.01.16 at 12:20, <feng.wu@xxxxxxxxx> wrote:
> > >Â
> > > Then you didn't understand: The question isn't this path, but the
> > > path where the hook gets called if non-NULL (and hence the
> > > possibility to avoid such needless calls).
> > 
> > I understand you mean the overhead happens when the hooks
> > is called. My point is the hook is not called in a critical path,
> > so I doubt
> > whether it worth doing so to make the logic complex.
> 
> Are you sure scheduling code is not a critical path?
> 
TBH, I like Jan's point... It's always good to make all we can to avoid
calling the hook, if unnecessary.

Does it really complicates things a lot? Feng, can you give it a try?

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
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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