Re: [Xen-devel] Xen 4.6 Development Update (two months reminder)

[Josh Whitehead <Josh.Whitehead@xxxxxxxxxxxxxxx>]

>On Thu, 2015-03-12 at 15:07 +0000, Ian Campbell wrote:
>> On Thu, 2015-03-12 at 10:21 +0000, wei.liu2@xxxxxxxxxx wrote:
>> 
> > *  Repurpose SEDF Scheduler for Real-time (fair)
>> >    RFC patch posted (v2)
>> >   -  Joshua Whitehead, Robert VanVossen
>> 
>> This was superceded by the RTDS stuff, wasn't it?
>> 
>I haven't head from Joshua and Robert in a while, so I don't really know 
>whether they're still working on this, but I think they're not.
>
>And yes, we have a new and modern real-time scheduling now, so I would rather 
>direct all the effort toward it (to move it out from 'experimental' status), 
>>and start thinking at ways to deprecate/get rid of SEDF.
>
>Regards,
>Dario

I apologize for our lack of communication and not keeping the list up to date 
on this.

This did get pushed to the back burner for a while as other responsibilities 
came along and we were also waiting to see what the RT-Xen folks were able to 
come up with as it looked quite promising.  However we (Robbie and I) have been 
discussing the last week or so here how we'd like to proceed on this.

At one point it had been put forward that we would submit our own complete 
scheduler and then look at "combining" the two (ours and rt-xen's) into one 
coherent scheduler, but we're not longer sure that's the best route forward.  
We did have a couple ideas that may be more easily implemented starting from 
the SEDF code, but we're still investigating some of that.  We still have to 
discuss it with our managers, so I don't want to commit to anything just yet, 
but I think Robbie and I are leaning toward contributing bug fixes and 
improvements to sched_rt to move it out of experimental/tech preview status as 
well as contributing one or more new deadline algorithms (CBS being the obvious 
first choice if that's still desired by the community).

We've had some new projects in the Xen arena begin here at DornerWorks 
(supporting Xen on the new Xilinx Zynq UltraScale+ MPSoC being the big one) and 
we hope to making contributions in several areas to the project in the next few 
months.  I will push the discussion of this topic in particular today and try 
to get back to everyone on this scheduler topic by the end of today or tomorrow.

Thanks for your time and again I apologize for the lack of communication on 
this topic.

- Joshua
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