linux-kernel - [PATCH v3 1/4] sched: cleanup inc/dec_rt

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Date:	Thu, 04 Dec 2008 10:43:41 -0500
From:	Gregory Haskins <ghaskins@...ell.com>
To:	mingo@...e.hu
Cc:	peterz@...radead.org, rostedt@...dmis.org, ghaskins@...ell.com,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: [PATCH v3 1/4] sched: cleanup inc/dec_rt_tasks

Move some common definitions up to the function prologe to simplify the
body logic.

Signed-off-by: Gregory Haskins <ghaskins@...ell.com>
---

 kernel/sched_rt.c |   40 +++++++++++++++++-----------------------
 1 files changed, 17 insertions(+), 23 deletions(-)

diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 1bbd990..fb1d4d7 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -550,30 +550,30 @@ static void update_curr_rt(struct rq *rq)
 static inline
 void inc_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
 {
-	WARN_ON(!rt_prio(rt_se_prio(rt_se)));
-	rt_rq->rt_nr_running++;
 #if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
-	if (rt_se_prio(rt_se) < rt_rq->highest_prio) {
+	int prio = rt_se_prio(rt_se);
+#endif
 #ifdef CONFIG_SMP
-		struct rq *rq = rq_of_rt_rq(rt_rq);
+	struct rq *rq = rq_of_rt_rq(rt_rq);
 #endif
 
-		rt_rq->highest_prio = rt_se_prio(rt_se);
+	WARN_ON(!rt_prio(prio));
+	rt_rq->rt_nr_running++;
+#if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
+	if (prio < rt_rq->highest_prio) {
+
+		rt_rq->highest_prio = prio;
 #ifdef CONFIG_SMP
 		if (rq->online)
-			cpupri_set(&rq->rd->cpupri, rq->cpu,
-				   rt_se_prio(rt_se));
+			cpupri_set(&rq->rd->cpupri, rq->cpu, prio);
 #endif
 	}
 #endif
 #ifdef CONFIG_SMP
-	if (rt_se->nr_cpus_allowed > 1) {
-		struct rq *rq = rq_of_rt_rq(rt_rq);
-
+	if (rt_se->nr_cpus_allowed > 1)
 		rq->rt.rt_nr_migratory++;
-	}
 
-	update_rt_migration(rq_of_rt_rq(rt_rq));
+	update_rt_migration(rq);
 #endif
 #ifdef CONFIG_RT_GROUP_SCHED
 	if (rt_se_boosted(rt_se))
@@ -590,6 +590,7 @@ static inline
 void dec_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
 {
 #ifdef CONFIG_SMP
+	struct rq *rq = rq_of_rt_rq(rt_rq);
 	int highest_prio = rt_rq->highest_prio;
 #endif
 
@@ -611,20 +612,13 @@ void dec_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
 		rt_rq->highest_prio = MAX_RT_PRIO;
 #endif
 #ifdef CONFIG_SMP
-	if (rt_se->nr_cpus_allowed > 1) {
-		struct rq *rq = rq_of_rt_rq(rt_rq);
+	if (rt_se->nr_cpus_allowed > 1)
 		rq->rt.rt_nr_migratory--;
-	}
 
-	if (rt_rq->highest_prio != highest_prio) {
-		struct rq *rq = rq_of_rt_rq(rt_rq);
-
-		if (rq->online)
-			cpupri_set(&rq->rd->cpupri, rq->cpu,
-				   rt_rq->highest_prio);
-	}
+	if (rq->online && rt_rq->highest_prio != highest_prio)
+		cpupri_set(&rq->rd->cpupri, rq->cpu, rt_rq->highest_prio);
 
-	update_rt_migration(rq_of_rt_rq(rt_rq));
+	update_rt_migration(rq);
 #endif /* CONFIG_SMP */
 #ifdef CONFIG_RT_GROUP_SCHED
 	if (rt_se_boosted(rt_se))

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