Re: Real Time Runqueue

Victor Yodaiken
2001-11-19T15:22:54Z

On Fri, Nov 16, 2001 at 04:32:24PM -0800, Mike Kravetz wrote:
> The reason I ask is that we went through the pains of a separate
> realtime RQ in our MQ scheduler. And yes, it does hurt the common
> case, not to mention the extra/complex code paths. I was hoping
> that someone in the know could enlighten us as to how RT semantics
> apply to SMP systems. If the semantics I suggest above are required,
> then it implies support must be added to any possible future
> scheduler implementations.

POSIX RT specs, at least last year, did not mention any SMP
requirements for scheduling at all.
What we do in RTLinux is require that RT threads be associated with a
processor identifier on the theory that the user may have some idea what
processors should run which RT threads, but the OS has no way of
guessing.

>
> --
> Mike
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