Re: [Xen-devel] [PATCH v1 3/3] xl: enable per-VCPU extratime flag for RTDS

[Dario Faggioli <dario.faggioli@xxxxxxxxxx>]

On Tue, 2017-08-08 at 15:55 -0700, Meng Xu wrote:
> On Tue, Aug 8, 2017 at 3:24 PM, Dario Faggioli
> <dario.faggioli@xxxxxxxxxx> wrote:
> > 
> > Therefore, I think I would set extratime as on by default in both
> > Xen
> > an xl. What do you think?
> > 
> 
> Right now, the domain is created with its VCPUs' extratime flag on.
> So
> by default, extratime is set on in Xen.
> 
> I'm not sure what do you suggest setting the extratime flag on by
> default in xl?
> Did you mean if users do not input -e option, the extratime flag will
> be set as on?
>
No, as I said, I'm ok with the requirement of -e 0/1 always having to
be present, when changing the vCPU(s) parameters with xl.

I'm talking about what happens at domain creation time.

If the default in Xen is already 'extratime on', I think we're mostly
fine.

As for xl/libxl, I think it would probably be good to take care of
extratime, e.g., in sched_rtds_domain_set() (in a similar way to how we
deal with period and budget, i.e., taking advantage of
LIBXL_DOMAIN_SCHED_PARAM_EXTRATIME_DEFAULT).

Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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