> After we looked at some alternative schedulers for the linux kernel
> (the QNX-like scheduler, the sched_idle patch at Linux-MAMA)
> a friend of mine (Marco Bodrato <bodrato@linuz.sns.it> )
> wrote a tiny patch that allows nice 20 tasks, which get executed only when
> the kernel has no other (normal or real-time priority) tasks to run.
>
> As I said, the patch is really small, so I attach it directly to this e-mail.
> If someone is interested in it and/or gives a feedback, he's
> welcome.
It looks nicely, still...
> @@ -283,6 +285,9 @@
> weight += 1;
> }
>
> + if (!p->priority)
> + weight -= 999;
> +
> return weight;
> }
=> weight is likely to be small but probably _not_ -999
> @@ -457,9 +462,10 @@
> }
>
> /* if all runnable processes have "counter == 0", re-calculate counters */
> - if (!c) {
> + if (!c || c==-999) {
So you should not test if it is _exactly_ -999.
Not sure I see bug. I may.
Pavel
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