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Message-Id: <20181106155731.32528-1-smuchun@gmail.com> Date: Tue, 6 Nov 2018 23:57:31 +0800 From: Muchun Song <smuchun@...il.com> To: mingo@...nel.org, peterz@...radead.org Cc: linux-kernel@...r.kernel.org Subject: [PATCH] sched/rt: Add a check for calling update_curr_rt() We may dequeue prev's rt_rq in put_prev_task() only when RT bandwidth is enabled. If RT bandwidth is disabled, it is unnecessary for us to call update_curr_rt(). So we add a check there. Signed-off-by: Muchun Song <smuchun@...il.com> --- kernel/sched/rt.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index 9aa3287ce301..7761a75d9b87 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -1564,10 +1564,11 @@ pick_next_task_rt(struct rq *rq, struct task_struct *prev, struct rq_flags *rf) } /* - * We may dequeue prev's rt_rq in put_prev_task(). - * So, we update time before rt_queued check. + * We may dequeue prev's rt_rq in put_prev_task() + * only when RT bandwidth is enabled. So, we + * update time before rt_queued check. */ - if (prev->sched_class == &rt_sched_class) + if (rt_bandwidth_enabled() && prev->sched_class == &rt_sched_class) update_curr_rt(rq); if (!rt_rq->rt_queued) -- 2.17.1
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