linux-kernel - [PATCH] sched/rt: use DIV_ROUND_UP to calculate sysctl_sched_rr

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Message-Id: <1616046809-6379-1-git-send-email-zhanghongchen@loongson.cn>
Date:   Thu, 18 Mar 2021 13:53:29 +0800
From:   Hongchen Zhang <zhanghongchen@...ngson.cn>
To:     mingo@...hat.com, peterz@...radead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] sched/rt: use DIV_ROUND_UP to calculate sysctl_sched_rr_timeslice

When HZ is 300, the value of sysctl_sched_rr_timeslice is different from
the actual value. Therefore, replace with DIV_ROUND_UP to calculate
sysctl_sched_rr_timeslice.

Signed-off-by: Hongchen Zhang <zhanghongchen@...ngson.cn>
---
 kernel/sched/rt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index b980cc96604f..c684440eefdb 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -8,7 +8,7 @@
 #include "pelt.h"
 
 int sched_rr_timeslice = RR_TIMESLICE;
-int sysctl_sched_rr_timeslice = (MSEC_PER_SEC / HZ) * RR_TIMESLICE;
+int sysctl_sched_rr_timeslice = DIV_ROUND_UP(RR_TIMESLICE * MSEC_PER_SEC, HZ);
 
 static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun);
 
-- 
2.27.0