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-rw-r--r--kernel/sched_rt.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index f8fb3ed..d047f28 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -1218,6 +1218,18 @@ static int pull_rt_task(struct rq *this_rq)
continue;
src_rq = cpu_rq(cpu);
+
+ /*
+ * Don't bother taking the src_rq->lock if the next highest
+ * task is known to be lower-priority than our current task.
+ * This may look racy, but if this value is about to go
+ * logically higher, the src_rq will push this task away.
+ * And if its going logically lower, we do not care
+ */
+ if (src_rq->rt.highest_prio.next >=
+ this_rq->rt.highest_prio.curr)
+ continue;
+
/*
* We can potentially drop this_rq's lock in
* double_lock_balance, and another CPU could
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