linux-kernel - [PATCH 2/2] sched: trigger_load

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Date:	Mon, 10 Sep 2012 15:10:59 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	mingo@...hat.com, peterz@...radead.org, tglx@...utronix.de
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] sched: trigger_load_balance clean up

Remove a redundant check for on_null_domain(cpu), and rerange the code
that make it more readable.

Signed-off-by: Alex Shi <alex.shi@...el.com>
---
 kernel/sched/fair.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 5bbc4bf..529092d 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4934,11 +4934,13 @@ static inline int on_null_domain(int cpu)
 void trigger_load_balance(struct rq *rq, int cpu)
 {
 	/* Don't need to rebalance while attached to NULL domain */
-	if (time_after_eq(jiffies, rq->next_balance) &&
-	    likely(!on_null_domain(cpu)))
+	if (unlikely(on_null_domain(cpu)))
+		return;
+
+	if (time_after_eq(jiffies, rq->next_balance))
 		raise_softirq(SCHED_SOFTIRQ);
 #ifdef CONFIG_NO_HZ
-	if (nohz_kick_needed(rq, cpu) && likely(!on_null_domain(cpu)))
+	if (nohz_kick_needed(rq, cpu))
 		nohz_balancer_kick(cpu);
 #endif
 }
-- 
1.7.5.4

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