--
On Fri, 12 Oct 2007, Peter Zijlstra wrote:
>
> And for that, steve's rq->curr_prio field seems quite suitable.
>
> so instead of the:
> for (3 tries)
> find lowest cpu
> try push
>
> we do:
>
> cpu_hotplug_lock();
> cpus_and(mask, p->cpus_allowed, online_cpus);
> for_each_cpu_mask(i, mask) {
> if (cpu_rq(i)->curr_prio > p->prio && push_task(p, i))
> break;
> }
> cpu_hotplug_unlock();
The thing I'm worried about is that we pushed off a rt task that is higher
in prio than another rt task on another cpu, and we'll cause a bunch of
rt task bouncing. That is what I'm trying to avoid.
BTW, my logging has showed that I have yet to hit a 2cd try (but I admit,
this is a very limited test set).
-- Steve
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