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

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

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?
 -George


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