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Re: [Xen-devel] [PATCH v1 0/3] Towards work-conserving RTDS

On Sun, 2017-08-06 at 12:22 -0400, Meng Xu wrote:
> This series of patches make RTDS scheduler work-conserving
> without breaking real-time guarantees.
> VCPUs with extratime flag set can get extra time
> from the unreserved system resource.
> System administrators can decide which VCPUs have extratime flag set.
> Example:
> Set the extratime bit of all VCPUs of domain 1:
> # xl sched-rtds -d 1 -v all -p 10000 -b 2000 -e 1
> Each VCPU of domain 1 will be guaranteed to have 2000ms every 10000ms
> (if the system is schedulable).
> If there is a CPU having no work to do,
> domain 1's VCPUs will be scheduled onto the CPU,
> even though the VCPUs have got 2000ms in 10000ms.
> Clear the extra bit of all VCPUs of domain 1:
> # xl sched-rtds -d 1 -v all -p 10000 -b 2000 -e 0
> Set/Clear the extratime bit of one specific VCPU of domain 1:
> # xl sched-rtds -d 1 -v 1 -p 10000 -b 2000 -e 1
> # xl sched-rtds -d 1 -v 1 -p 10000 -b 2000 -e 0
Oh, BTW, can you please update 'docs/features/sched_rtds.pandoc' too?

<<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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