Special schedulers, one CPU only kernel, one only userland

[Andre Oppermann]

John Baldwin wrote:
> 
> On Wednesday 10 August 2005 10:10 pm, gnn at freebsd.org wrote:
> > But, the question, which is interesting to me for other reasons
> > (namely putting in various real-time schedulers) was not answered.  Do
> > we currently have the requisite primitives to implement different
> > schedulers or is there still a lot of jiggery/pokery required?
> 
> Yes, there is some room for different schedulers, but the idea of using a
> master/slave SMP system is not ust a different scheduler, but an entirely
> different SMP architecture.  That said, if you added one more sched_foo call
> for synchronous kernel entry in trap() and syscall(), you probably could
> provide a master/slave setup via a custom scheduler.  It would be more
> optimal to also tweak the low-level routing of interrupts to CPUs on
> architectures that support it as well, though that would not be required.

This is the answer I was looking for.  Thanks.

-- 
Andre