Re: [PATCH] [RSDL-mm 0/6] RSDL cpu scheduler for -mm

Con Kolivas
2007-03-08T05:40:23Z

On Thursday 08 March 2007 15:15, Andrew Morton wrote:
> On Wed, 7 Mar 2007 18:54:30 -0800 Andrew Morton <akpm@linux-foundation.org>
wrote:
> > On Wed, 7 Mar 2007 17:43:45 -0800 Andrew Morton
<akpm@linux-foundation.org> wrote:
> > > On Wed, 7 Mar 2007 12:26:42 +1100
> > >
> > > Con Kolivas <kernel@kolivas.org> wrote:
> > > > What follows is the same patch series that constitutes the RDSL
> > > > "Rotating Staircase DeadLine" cpu scheduler resynced for
> > > > 2.6.21-rc2-mm2.
> > >
> > > Big oops early in boot on x86_64 SMP, in rq_bitmap_error+0x97/0x9f.
> > >
> > > I stubbed it out with a `return MAX_RT_PRIO;' (I think) but it then
> > > oopsed differently. Before netconsole had come up, no serial console,
> > > no digital camera.
> > >
> > > There's stuff in http://userweb.kernel.org/~akpm/ck/ - you can probably
> > > boot that kernel on your own machine.
> > >
> > > I need to do rc3-mm1 now. I might find some time to poke at this
> > > further after that, but I have to leave for a week in .jp and it'll be
> > > squeezy, sorry.
> >
> > well it boots os dual pIII and quad powerpc.
>
> It also boots OK on a very similar but somewhat older Nocona machine.
> Perhaps due to config changes:
> http://userweb.kernel.org/~akpm/ck/config-ok.txt

Ok I just remembered that not only did I expect the cpu task to never be
scheduled and it _might_ be scheduled on sched_init, it is actually
_consciously_ scheduled on hotplug cpu which I have no way of handling at the
moment. On both your configs I noticed you had hotplug cpu enabled, but
perhaps it isn't really being used on the more conservative config. So this
is something I already know I need to handle. Did your ppc that had
the "bitmap error" have hotplug cpu enabled? It might be an unrelated
bug^Wphenomenon.

--
-ck