linux-kernel - [PATCH 1/7] sched: reduce nohz_kick

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Message-Id: <1388411093-3413-2-git-send-email-daniel.lezcano@linaro.org>
Date:	Mon, 30 Dec 2013 14:44:47 +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
Subject: [PATCH 1/7] sched: reduce nohz_kick_needed parameters

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

The caller of this function just called idle_cpu() before to fill the
rq->idle_balance field.

Use rq->cpu and rq->idle_balance.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 kernel/sched/fair.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 600301c..4cb414a 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6781,14 +6781,14 @@ end:
  *   - For SD_ASYM_PACKING, if the lower numbered cpu's in the scheduler
  *     domain span are idle.
  */
-static inline int nohz_kick_needed(struct rq *rq, int cpu)
+static inline int nohz_kick_needed(struct rq *rq)
 {
 	unsigned long now = jiffies;
 	struct sched_domain *sd;
 	struct sched_group_power *sgp;
-	int nr_busy;
+	int nr_busy, cpu = rq->cpu;
 
-	if (unlikely(idle_cpu(cpu)))
+	if (unlikely(rq->idle_balance))
 		return 0;
 
        /*
@@ -6878,7 +6878,7 @@ void trigger_load_balance(struct rq *rq)
 	    likely(!on_null_domain(cpu)))
 		raise_softirq(SCHED_SOFTIRQ);
 #ifdef CONFIG_NO_HZ_COMMON
-	if (nohz_kick_needed(rq, cpu) && likely(!on_null_domain(cpu)))
+	if (nohz_kick_needed(rq) && likely(!on_null_domain(cpu)))
 		nohz_balancer_kick(cpu);
 #endif
 }
-- 
1.7.9.5

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