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Re: [Xen-devel] [RFC Patch 0/3] Putting the "Simple" back in sedf.

On 03/14/2014 07:13 PM, Nathan Studer wrote:
From: Nathan Studer <nate.studer@xxxxxxxxxxxxxxx>

With the increased interest in embedded Xen, there is a need for a suitable
real-time scheduler.  The arinc653 scheduler currently only supports a
single core and has limited niche appeal, while the sedf scheduler is
widely consider deprecated and is currently a mess.

Since both the CBS scheduler proposed by Dario and the schedulers of Xen-RT
use an edf scheduler as the lowest-level scheduling mechanism, it seems
worthwhile to start repurposing the sedf scheduler instead of creating a
completely new scheduler.

This patchset begins this repurposing by removing the extra scheduling code
that has built up over the years, and returns the sedf scheduler to its
simple roots.

Hey Nate,

Thanks for these patches -- what you describe at a high level, making sedf a suitable rts for embedded applications, sounds like a great idea.

I think what might be helpful in evaluating whether these patches are a good idea at the high level is a bit of a description of where you see this going long-term. Can you sketch out, at a high level, what you envision the sedf scheduler becoming? What kinds of parameters and features *will* it have?


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