linux-kernel - [PATCH V2 1/8] sched: reduce trigger_load

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Date:	Mon,  6 Jan 2014 12:34:38 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	mingo@...hat.com, peterz@...radead.org
Cc:	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	preeti.lkml@...il.com
Subject: [PATCH V2 1/8] sched: reduce trigger_load_balance parameters

The cpu information is already stored in the struct rq, so no need to pass it
as parameter to the trigger_load_balance function.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 kernel/sched/core.c  |    2 +-
 kernel/sched/fair.c  |    4 +++-
 kernel/sched/sched.h |    2 +-
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index b21a63e..7007884 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2299,7 +2299,7 @@ void scheduler_tick(void)
 
 #ifdef CONFIG_SMP
 	rq->idle_balance = idle_cpu(cpu);
-	trigger_load_balance(rq, cpu);
+	trigger_load_balance(rq);
 #endif
 	rq_last_tick_reset(rq);
 }
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 4316af2..600301c 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6869,8 +6869,10 @@ static inline int on_null_domain(int cpu)
 /*
  * Trigger the SCHED_SOFTIRQ if it is time to do periodic load balancing.
  */
-void trigger_load_balance(struct rq *rq, int cpu)
+void trigger_load_balance(struct rq *rq)
 {
+	int cpu = rq->cpu;
+
 	/* Don't need to rebalance while attached to NULL domain */
 	if (time_after_eq(jiffies, rq->next_balance) &&
 	    likely(!on_null_domain(cpu)))
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index b3b4a49..4f10d1a 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1052,7 +1052,7 @@ extern const struct sched_class idle_sched_class;
 
 extern void update_group_power(struct sched_domain *sd, int cpu);
 
-extern void trigger_load_balance(struct rq *rq, int cpu);
+extern void trigger_load_balance(struct rq *rq);
 extern void idle_balance(int this_cpu, struct rq *this_rq);
 
 extern void idle_enter_fair(struct rq *this_rq);
-- 
1.7.9.5

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