linux-kernel - [PATCH] sched/fair: code clean up for __sched

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Message-Id: <1435847152-29543-1-git-send-email-boqun.feng@gmail.com>
Date:	Thu,  2 Jul 2015 22:25:52 +0800
From:	Boqun Feng <boqun.feng@...il.com>
To:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Boqun Feng <boqun.feng@...il.com>
Subject: [PATCH] sched/fair: code clean up for __sched_period()

Since commit: 4bf0b77158 ("sched: remove do_div() from
__sched_slice()"), the logic of __sched_period() can be implemented as a
single if-else without any local variable, so this patch cleans it up
with an if-else statement, which expresses the function's logic
straightforwardly.

Signed-off-by: Boqun Feng <boqun.feng@...il.com>
---
 kernel/sched/fair.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 4b6e5f6..341a51f 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -616,15 +616,10 @@ static inline u64 calc_delta_fair(u64 delta, struct sched_entity *se)
  */
 static u64 __sched_period(unsigned long nr_running)
 {
-	u64 period = sysctl_sched_latency;
-	unsigned long nr_latency = sched_nr_latency;
-
-	if (unlikely(nr_running > nr_latency)) {
-		period = sysctl_sched_min_granularity;
-		period *= nr_running;
-	}
-
-	return period;
+	if (unlikely(nr_running > sched_nr_latency))
+		return nr_running * sysctl_sched_min_granularity;
+	else
+		return sysctl_sched_latency;
 }
 
 /*
-- 
2.4.5

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