Re: [RFC -v3 PATCH 2/3] sched: add yield_to function

From: Rik van Riel
Date: Tue Jan 04 2011 - 11:54:22 EST

On 01/04/2011 11:51 AM, Hillf Danton wrote:

Wouldn't that break for FIFO and RR tasks?

There's a reason all the scheduler folks wanted a
per-class yield_to_task function :)

Where is the yield_to callback in the patch for RT schedule class?
If @p is RT, what could you do?

If the user chooses to overcommit the CPU with realtime
tasks, the user cannot expect realtime response.

For realtime, I have not implemented the yield_to callback
at all because it would probably break realtime semantics
and I assume people will not overcommit the CPU with realtime
tasks anyway.

I could see running a few realtime guests on a system, with
the number of realtime VCPUs not exceeding the number of
physical CPUs.

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