Re: RFC: THE OFFLINE SCHEDULER

Christoph Lameter
2009-08-25T19:18:43Z

On Tue, 25 Aug 2009, Peter Zijlstra wrote:

> On Tue, 2009-08-25 at 14:03 -0400, Christoph Lameter wrote:
> > On Tue, 25 Aug 2009, Mike Galbraith wrote:
> >
> > > I asked the questions I did out of pure curiosity, and that curiosity
> > > has been satisfied. It's not that I find it useless or whatnot (or that
> > > my opinion matters to anyone but me;). I personally find the concept of
> > > injecting an RTOS into a general purpose OS with no isolation to be
> > > alien. Intriguing, but very very alien.
> >
> > Well lets work on the isolation piece then. We could run a regular process
> > on the RT cpu and switch back when OS services are needed?
>
> Christoph, stop being silly, this offline scheduler thing won't happen,
> full stop.

Well there are the low latency requirements still. Those need to be
addressed in some form. Some of these ideas here are a starting point.

> Its not a maintainable solution, it doesn't integrate with existing
> kernel infrastructure, and its plain ugly.
>
> If you want something work within Linux, don't build kernels in kernels
> or other such ugly hacks.

Ok so how would you go about avoiding the OS noise which motivated
the patches for the Offline scheduler?