On Mon, May 11, 2015 at 4:56 AM, Dario Faggioli <dario.faggi...@citrix.com> wrote:
> On Thu, 2015-05-07 at 12:05 -0500, Chong Li wrote: > > [Goal] > > The current xl sched-rtds tool can only set the VCPUs of a domain to the > same parameter > > although the scheduler supports VCPUs with different parameters. This > patchset is to > > enable xl sched-rtds tool to configure the VCPUs of a domain with > different parameters. > > > > This per-VCPU settings can be used in many scenarios. For example, based > on Dario's statement in our pervious discussion( > http://lists.xen.org/archives/html/xen-devel/2014-09/msg00423.html), if > there are two real-time applications, which have different timing > requirements, running in a multi-VCPU guest domain, it is beneficial to pin > these two applications to two seperate VCPUs with different scheduling > parameters. > > > Right. And in fact, I'm glad to see this is happening, thanks for doing > this work! :-) > > > 1) show the budget and period of each VCPU of each domain, by using "xl > sched-rtds" command. An example would be like: > > > > [..] > > > > 2) show the budget and period of each VCPU of a specific domain, by > using, > > e.g., "xl sched-rtds -d vm1" command. The output would be like: > > > > [..] > > > > 3) set the budget and period of each VCPU of a specific domain, by using, > > e.g., "xl sched-rtds -d vm1 -v 0 -p 100 -b 50" command (where "-v 0" > specifies > > the VCPU with ID=0). The parameters would be like: > > > > [..] > > > > 4) Users can still set the per-domain parameters (previous xl rtds tool > already supported this). > > e.g., "xl sched-rtds -d vm1 -p 500 -b 250". The parameters would be like: > > > The CLI looks nice to me. I'm wondering, what happens if the user tries > to only alter the budget or the period of a vcpu (or of a domain)? I > think that is not possible right now, is it? > You're right. The current design requires both budget and period in a 'set' command. > > Would it make sense to allow that? I think it would, but this can well > happen later, once we will have this in. > Yes, we can definitely implement that, after all the other issues in this patch are well solved. > > Regards, > Dario > -- Chong Li Department of Computer Science and Engineering Washington University in St.louis
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