* Martin Roehricht <[email protected]> wrote:
> On 08/02/2007 01:40 PM, Ingo Molnar wrote:
> >in the SMP migration code, the 'old scheduler' indeed picks the lowest
> >priority one, _except_ if that task is running on another CPU or is too
> >'cache hot':
>
> But why is it, that the scheduler picks the lowest priority one? I
> thought sched_find_first_bit() picks the index of the lowest order bit
> in the bitmap and thus the highest priority job. Is that wrong? What
> needs to be changed to let the scheduler pick the highest priority
> task from a given runqueue? I am very confused ...
it first picks the lowest index (i.e. the highest priority active
priority-queue), but within those tasks (each task in that priority
queue has equal priority) the load-balancer has freedom to pick any.
Based on performance data we went for picking from the tail of the
queue.
Ingo
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