Re: 2.6.4-mm1

[Nick Piggin]

Anton Blanchard wrote:

> > - The CPU scheduler changes in -mm (sched-domains) have been hanging about
> >  for too long.  I had been hoping that the people who care about SMT and
> >  NUMA performance would have some results by now but all seems to be silent.
> >
> >  I do not wish to merge these up until the big-iron guys can say that they
> >  suit their requirements, with a reasonable expectation that we will not
> >  need to churn this code later in the 2.6 series.
> >
> >  So.  If you have been testing, please speak up.  If you have not been
> >  testing, please do so.
>
> I sucked sched-* out of mm, added sched-ppc64bits (attached) and am
> having problems with the following threaded test case. NUMA is enabled.
>
> #include <pthread.h>
> #define NR_THREADS 100
>
> void dostuff(void *junk)
> {
>        while(1)
>                ;
> }
>
> int main()
> {
>        int i;
>        pthread_t tid;
>
>        for (i = 0; i < NR_THREADS-1; i++)
>                pthread_create(&tid, NULL, dostuff, NULL);
>
>        dostuff(NULL);
> }
>
> 100 runnable threads but we never use more than one cpu:

OK thanks. This is probably a simple bug somewhere. I'll have a look
at it soon.


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