linux-kernel - [tip:sched/core] sched: Remove double calculation in fix_small

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Message-ID: <tip-a2cd42601b474b957e1a5fe3692bcf7f9363bd51@git.kernel.org>
Date:	Wed, 12 Mar 2014 03:10:32 -0700
From:	tip-bot for Vincent Guittot <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, vincent.guittot@...aro.org,
	tglx@...utronix.de
Subject: [tip:sched/core] sched:
  Remove double calculation in fix_small_imbalance()

Commit-ID:  a2cd42601b474b957e1a5fe3692bcf7f9363bd51
Gitweb:     http://git.kernel.org/tip/a2cd42601b474b957e1a5fe3692bcf7f9363bd51
Author:     Vincent Guittot <vincent.guittot@...aro.org>
AuthorDate: Tue, 11 Mar 2014 17:26:06 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 12 Mar 2014 10:49:00 +0100

sched: Remove double calculation in fix_small_imbalance()

The tmp value has been already calculated in:

  scaled_busy_load_per_task =
		(busiest->load_per_task * SCHED_POWER_SCALE) /
		busiest->group_power;

Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/1394555166-22894-1-git-send-email-vincent.guittot@linaro.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index f1eedae..b301918 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6061,12 +6061,10 @@ void fix_small_imbalance(struct lb_env *env, struct sd_lb_stats *sds)
 	pwr_now /= SCHED_POWER_SCALE;
 
 	/* Amount of load we'd subtract */
-	tmp = (busiest->load_per_task * SCHED_POWER_SCALE) /
-		busiest->group_power;
-	if (busiest->avg_load > tmp) {
+	if (busiest->avg_load > scaled_busy_load_per_task) {
 		pwr_move += busiest->group_power *
 			    min(busiest->load_per_task,
-				busiest->avg_load - tmp);
+				busiest->avg_load - scaled_busy_load_per_task);
 	}
 
 	/* Amount of load we'd add */
--
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