diff options
| -rw-r--r-- | kernel/sched.c | 34 |
1 files changed, 18 insertions, 16 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index a3a04085e79..66bd7ff23f1 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -169,7 +169,7 @@ unsigned long long __attribute__((weak)) sched_clock(void) (MAX_BONUS / 2 + DELTA((p)) + 1) / MAX_BONUS - 1)) #define TASK_PREEMPTS_CURR(p, rq) \ - (((p)->prio < (rq)->curr->prio) && ((p)->array == (rq)->active)) + ((p)->prio < (rq)->curr->prio) #define SCALE_PRIO(x, prio) \ max(x * (MAX_PRIO - prio) / (MAX_USER_PRIO / 2), MIN_TIMESLICE) @@ -4076,13 +4076,13 @@ void rt_mutex_setprio(struct task_struct *p, int prio) struct prio_array *array; unsigned long flags; struct rq *rq; - int delta; + int oldprio; BUG_ON(prio < 0 || prio > MAX_PRIO); rq = task_rq_lock(p, &flags); - delta = prio - p->prio; + oldprio = p->prio; array = p->array; if (array) dequeue_task(p, array); @@ -4098,11 +4098,13 @@ void rt_mutex_setprio(struct task_struct *p, int prio) enqueue_task(p, array); /* * Reschedule if we are currently running on this runqueue and - * our priority decreased, or if our priority became higher - * than the current's. + * our priority decreased, or if we are not currently running on + * this runqueue and our priority is higher than the current's */ - if (TASK_PREEMPTS_CURR(p, rq) || - (delta > 0 && task_running(rq, p))) + if (task_running(rq, p)) { + if (p->prio > oldprio) + resched_task(rq->curr); + } else if (TASK_PREEMPTS_CURR(p, rq)) resched_task(rq->curr); } task_rq_unlock(rq, &flags); @@ -4150,12 +4152,10 @@ void set_user_nice(struct task_struct *p, long nice) enqueue_task(p, array); inc_raw_weighted_load(rq, p); /* - * Reschedule if we are currently running on this runqueue and - * our priority decreased, or if our priority became higher - * than the current's. + * If the task increased its priority or is running and + * lowered its priority, then reschedule its CPU: */ - if (TASK_PREEMPTS_CURR(p, rq) || - (delta > 0 && task_running(rq, p))) + if (delta < 0 || (delta > 0 && task_running(rq, p))) resched_task(rq->curr); } out_unlock: @@ -4382,11 +4382,13 @@ recheck: __activate_task(p, rq); /* * Reschedule if we are currently running on this runqueue and - * our priority decreased, or our priority became higher - * than the current's. + * our priority decreased, or if we are not currently running on + * this runqueue and our priority is higher than the current's */ - if (TASK_PREEMPTS_CURR(p, rq) || - (task_running(rq, p) && p->prio > oldprio)) + if (task_running(rq, p)) { + if (p->prio > oldprio) + resched_task(rq->curr); + } else if (TASK_PREEMPTS_CURR(p, rq)) resched_task(rq->curr); } __task_rq_unlock(rq); |