linux-kernel - [PATCH 1/1] sched/rt: add rt throttled/unthrottled log

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Date:   Tue, 8 Sep 2020 17:05:46 +0800
From:   Jing-Ting Wu <jing-ting.wu@...iatek.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     <wsd_upstream@...iatek.com>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        Jing-Ting Wu <jing-ting.wu@...iatek.com>
Subject: [PATCH 1/1] sched/rt: add rt throttled/unthrottled log

Always print logs when rt throttle/unthrottle,
it is much easier to locate the throttled period.

Signed-off-by: Jing-Ting Wu <jing-ting.wu@...iatek.com>
---
 kernel/sched/rt.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index f215eea..598046c 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -902,6 +902,9 @@ static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun)
 				rt_rq->rt_throttled = 0;
 				enqueue = 1;
 
+				printk_deferred("sched: RT throttling inactivated cpu=%d\n",
+						i);
+
 				/*
 				 * When we're idle and a woken (rt) task is
 				 * throttled check_preempt_curr() will set
@@ -970,7 +973,7 @@ static int sched_rt_runtime_exceeded(struct rt_rq *rt_rq)
 		 */
 		if (likely(rt_b->rt_runtime)) {
 			rt_rq->rt_throttled = 1;
-			printk_deferred_once("sched: RT throttling activated\n");
+			printk_deferred("sched: RT throttling activated\n");
 		} else {
 			/*
 			 * In case we did anyway, make it go away,
-- 
1.7.9.5