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sched: Give CPU bound RT tasks preference 

If a high priority task is waking up on a CPU that is running a
lower priority task that is bound to a CPU, see if we can move the
high RT task to another CPU first. Note, if all other CPUs are
running higher priority tasks than the CPU bounded current task,
then it will be preempted regardless.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Gregory Haskins <ghaskins@novell.com>
LKML-Reference: <20100921024138.888922071@goodmis.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt 2010-09-20 22:40:04 -04:00 committed by Ingo Molnar
parent 43fa5460fe
commit b3bc211cfe
1 changed files with 5 additions and 3 deletions
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8
kernel/sched_rt.c
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@ -971,7 +971,8 @@ select_task_rq_rt(struct rq *rq, struct task_struct *p, int sd_flag, int flags)
* For equal prio tasks, we just let the scheduler sort it out.
*/
if (unlikely(rt_task(rq->curr)) &&
rq->curr->prio < p->prio &&
(rq->curr->rt.nr_cpus_allowed < 2 ||
rq->curr->prio < p->prio) &&
(p->rt.nr_cpus_allowed > 1)) {
int cpu = find_lowest_rq(p);
@ -1491,9 +1492,10 @@ static void task_woken_rt(struct rq *rq, struct task_struct *p)
if (!task_running(rq, p) &&
!test_tsk_need_resched(rq->curr) &&
has_pushable_tasks(rq) &&
p->rt.nr_cpus_allowed > 1 &&
rt_task(rq->curr) &&
rq->curr->prio < p->prio &&
p->rt.nr_cpus_allowed > 1)
(rq->curr->rt.nr_cpus_allowed < 2 ||
rq->curr->prio < p->prio))
push_rt_tasks(rq);
}