Peter Williams <[email protected]> wrote:
>
> Negate the expression and apply de Marcos rule to simplify it. This
> patch is on top of
> sched-avoid-unnecessarily-moving-highest-priority-task-move_tasks.patch
>
> Signed-off-by: Peter Williams <[email protected]>
>
> --
> Peter Williams [email protected]
>
> "Learning, n. The kind of ignorance distinguishing the studious."
> -- Ambrose Bierce
>
>
> [smpnice-fix-boolean-expression text/plain (824 bytes)]
> Index: MM-2.6.17-rc1-mm3/kernel/sched.c
> ===================================================================
> --- MM-2.6.17-rc1-mm3.orig/kernel/sched.c 2006-04-21 12:26:54.000000000 +1000
> +++ MM-2.6.17-rc1-mm3/kernel/sched.c 2006-04-25 09:09:54.000000000 +1000
> @@ -2108,7 +2108,7 @@ skip_queue:
> */
> skip_for_load = tmp->load_weight > rem_load_move;
> if (skip_for_load && idx < this_best_prio)
> - skip_for_load = busiest_best_prio_seen || idx != busiest_best_prio;
> + skip_for_load = !busiest_best_prio_seen && idx == busiest_best_prio;
But Suresh's
sched-avoid-unnecessarily-moving-highest-priority-task-move_tasks-fix.patch
changed all this code:
/*
* To help distribute high priority tasks accross CPUs we don't
* skip a task if it will be the highest priority task (i.e. smallest
* prio value) on its new queue regardless of its load weight
*/
skip_for_load = tmp->load_weight > rem_load_move;
if (skip_for_load && idx < this_best_prio && idx == busiest_best_prio)
skip_for_load = !busiest_best_prio_seen &&
head->next == head->prev;
if (skip_for_load ||
!can_migrate_task(tmp, busiest, this_cpu, sd, idle, &pinned)) {
if (curr != head)
goto skip_queue;
idx++;
goto skip_bitmap;
}
What to do?
-
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