Re: RT task scheduling

[Ingo Molnar <mingo@elte.hu>]

* Bill Huey <billh@gnuppy.monkey.org> wrote:

> On Fri, Apr 07, 2006 at 07:56:20AM -0700, Darren Hart wrote:
> > The rt-overload mechanism is distinct from load balancing.  RT overload 
> > attempts to make sure the NR_CPUS highest priority runnable tasks are running 
> > on each of the available CPUs.  This isn't load balancing, this is "system 
> > wide strict realtime priority scheduling" (SWSRPS).  This scheduling should 
> > take place even if there are 1000 non RT tasks on CPU 0 and none on all the 
> > others.  The load balancer would be responsible for distributing those 1000 
> > non rt tasks to all the CPUs.
> 
> I'm quite aware of what you're saying as well as a much of the 
> contents of the -rt patch. Please don't assume that I'm not aware of 
> this. The -rt patch doesn't do SWSRPS, [...]

to the contrary, the "RT overload" code in the -rt tree does strict, 
system-wide RT priority scheduling. That's the whole point of it.

	Ingo