diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched/rt.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index 5c1622cda..fb7892646 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -1539,7 +1539,12 @@ select_task_rq_rt(struct task_struct *p, int sd_flag, int flags) #endif int target = find_lowest_rq(p); - if (target != -1) + /* + * Don't bother moving it if the destination CPU is + * not running a lower priority task. + */ + if (target != -1 && + p->prio < cpu_rq(target)->rt.highest_prio.curr) cpu = target; mt_sched_printf(sched_rt_info, "2. select_task_rq_rt %d:%s to cpu=%d", p->pid, p->comm, cpu); @@ -2205,6 +2210,16 @@ static struct rq *find_lock_lowest_rq(struct task_struct *task, struct rq *rq) lowest_rq = cpu_rq(cpu); + if (lowest_rq->rt.highest_prio.curr <= task->prio) { + /* + * Target rq has tasks of equal or higher priority, + * retrying does not release any lock and is unlikely + * to yield a different result. + */ + lowest_rq = NULL; + break; + } + /* if the prio of this runqueue changed, try again */ if (double_lock_balance(rq, lowest_rq)) { /* |