linux-kernel - [tip:sched/core] sched/fair: Clean up the __sched

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Date:	Mon, 6 Jul 2015 08:51:07 -0700
From:	tip-bot for Boqun Feng <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	srikar@...ux.vnet.ibm.com, hpa@...or.com, boqun.feng@...il.com,
	tglx@...utronix.de, torvalds@...ux-foundation.org,
	peterz@...radead.org, linux-kernel@...r.kernel.org,
	mingo@...nel.org
Subject: [tip:sched/core] sched/fair: Clean up the __sched_period() code

Commit-ID:  42d1c60e15ff89150a3b3537fec579f8a8f36a8a
Gitweb:     http://git.kernel.org/tip/42d1c60e15ff89150a3b3537fec579f8a8f36a8a
Author:     Boqun Feng <boqun.feng@...il.com>
AuthorDate: Thu, 2 Jul 2015 22:25:52 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 6 Jul 2015 15:29:56 +0200

sched/fair: Clean up the __sched_period() code

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 variables, 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>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/1435847152-29543-1-git-send-email-boqun.feng@gmail.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 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 a53a610..03ea05b 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;
 }
 
 /*
--
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