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-rw-r--r--kernel/sched_rt.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 95f36f61ae1..ac7d0678645 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -151,8 +151,27 @@ yield_task_rt(struct rq *rq)
}
#ifdef CONFIG_SMP
+static int find_lowest_rq(struct task_struct *task);
+
static int select_task_rq_rt(struct task_struct *p, int sync)
{
+ struct rq *rq = task_rq(p);
+
+ /*
+ * If the task will not preempt the RQ, try to find a better RQ
+ * before we even activate the task
+ */
+ if ((p->prio >= rq->rt.highest_prio)
+ && (p->nr_cpus_allowed > 1)) {
+ int cpu = find_lowest_rq(p);
+
+ return (cpu == -1) ? task_cpu(p) : cpu;
+ }
+
+ /*
+ * Otherwise, just let it ride on the affined RQ and the
+ * post-schedule router will push the preempted task away
+ */
return task_cpu(p);
}
#endif /* CONFIG_SMP */