This patch add rq->clock update skip for dl task yield to tell
update_rq_clock() that we've just updated, so we don't do
microscopic update in schedule() and double the fastpath cost.
Signed-off-by: Wanpeng Li <wanpeng...@linux.intel.com>
---
kernel/sched/deadline.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 1ed6928..c397e6b 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -968,6 +968,12 @@ static void yield_task_dl(struct rq *rq)
}
update_rq_clock(rq);
update_curr_dl(rq);
+ /*
+ * Tell update_rq_clock() that we've just updated,
+ * so we don't do microscopic update in schedule()
+ * and double the fastpath cost.
+ */
+ rq_clock_skip_update(rq, true);
}
#ifdef CONFIG_SMP
--
1.9.1
--
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