linux-kernel - [tip:sched/core] sched/fair: Remove 'cpu_busy' parameter from update_next

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Message-ID: <tip-31851a9874d63dbb532910a86b2be49c15997ea3@git.kernel.org>
Date:	Wed, 10 Aug 2016 11:01:46 -0700
From:	tip-bot for Leo Yan <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	efault@....de, peterz@...radead.org, torvalds@...ux-foundation.org,
	leo.yan@...aro.org, tglx@...utronix.de, mingo@...nel.org,
	linux-kernel@...r.kernel.org, hpa@...or.com
Subject: [tip:sched/core] sched/fair: Remove 'cpu_busy' parameter from
 update_next_balance()

Commit-ID:  31851a9874d63dbb532910a86b2be49c15997ea3
Gitweb:     http://git.kernel.org/tip/31851a9874d63dbb532910a86b2be49c15997ea3
Author:     Leo Yan <leo.yan@...aro.org>
AuthorDate: Fri, 5 Aug 2016 14:31:29 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 10 Aug 2016 14:03:32 +0200

sched/fair: Remove 'cpu_busy' parameter from update_next_balance()

The update_next_balance() function is only used by idle balancing, so its
'cpu_busy' parameter is always 0.

Open code it instead of passing it around.

Signed-off-by: Leo Yan <leo.yan@...aro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mike Galbraith <efault@....de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-kernel@...r.kernel.org
Link: http://lkml.kernel.org/r/1470378689-14892-1-git-send-email-leo.yan@linaro.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/fair.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 039de34..d300536 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7704,11 +7704,12 @@ get_sd_balance_interval(struct sched_domain *sd, int cpu_busy)
 }
 
 static inline void
-update_next_balance(struct sched_domain *sd, int cpu_busy, unsigned long *next_balance)
+update_next_balance(struct sched_domain *sd, unsigned long *next_balance)
 {
 	unsigned long interval, next;
 
-	interval = get_sd_balance_interval(sd, cpu_busy);
+	/* used by idle balance, so cpu_busy = 0 */
+	interval = get_sd_balance_interval(sd, 0);
 	next = sd->last_balance + interval;
 
 	if (time_after(*next_balance, next))
@@ -7738,7 +7739,7 @@ static int idle_balance(struct rq *this_rq)
 		rcu_read_lock();
 		sd = rcu_dereference_check_sched_domain(this_rq->sd);
 		if (sd)
-			update_next_balance(sd, 0, &next_balance);
+			update_next_balance(sd, &next_balance);
 		rcu_read_unlock();
 
 		goto out;
@@ -7756,7 +7757,7 @@ static int idle_balance(struct rq *this_rq)
 			continue;
 
 		if (this_rq->avg_idle < curr_cost + sd->max_newidle_lb_cost) {
-			update_next_balance(sd, 0, &next_balance);
+			update_next_balance(sd, &next_balance);
 			break;
 		}
 
@@ -7774,7 +7775,7 @@ static int idle_balance(struct rq *this_rq)
 			curr_cost += domain_cost;
 		}
 
-		update_next_balance(sd, 0, &next_balance);
+		update_next_balance(sd, &next_balance);
 
 		/*
 		 * Stop searching for tasks to pull if there are