Messages in this thread Patch in this message | | | Date | Sun, 5 Jun 2011 17:54:04 +0800 | Subject | [PATCH] sched: update cpupri for runqueue when its priority changes | From | Hillf Danton <> |
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When the priority of runqueue changes, lower or higer, the info of cpupri should be updated, in cases such as pick_next_task_rt() and switched_to_rt().
Signed-off-by: Hillf Danton <dhillf@gmail.com> --- kernel/sched_rt.c | 11 ++++++++++- 1 files changed, 10 insertions(+), 1 deletions(-)
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c index 08e9374..9508168 100644 --- a/kernel/sched_rt.c +++ b/kernel/sched_rt.c @@ -1158,6 +1158,8 @@ static struct task_struct *pick_next_task_rt(struct rq *rq) * lock again later if there is no need to push */ rq->post_schedule = has_pushable_tasks(rq); + + cpupri_set(&rq->rd->cpupri, rq->cpu, p == NULL ? MAX_RT_PRIO : p->prio); #endif
return p; @@ -1673,6 +1675,8 @@ static void switched_to_rt(struct rq *rq, struct task_struct *p) { int check_resched = 1;
+ if (!p->on_rq) + return; /* * If we are already running, then there's nothing * that needs to be done. But if we are not running @@ -1680,7 +1684,7 @@ static void switched_to_rt(struct rq *rq, struct task_struct *p) * If that current running task is also an RT task * then see if we can move to another run queue. */ - if (p->on_rq && rq->curr != p) { + if (rq->curr != p) { #ifdef CONFIG_SMP if (rq->rt.overloaded && push_rt_task(rq) && /* Don't resched if we changed runqueues */ @@ -1690,6 +1694,11 @@ static void switched_to_rt(struct rq *rq, struct task_struct *p) if (check_resched && p->prio < rq->curr->prio) resched_task(rq->curr); } + else { +#ifdef CONFIG_SMP + cpupri_set(&rq->rd->cpupri, rq->cpu, p->prio); +#endif + } }
/*
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