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

On Wed, Aug 9, 2017 at 3:32 AM, Dario Faggioli
<dario.faggioli@xxxxxxxxxx> wrote:
> 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.

Yes. It is.

> 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




Meng Xu
PhD Candidate in Computer and Information Science
University of Pennsylvania

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