linux-kernel - [PATCH 1/4] sched/numa: Rename nr_running and break out the magic number

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Message-Id: <20201120090630.3286-2-mgorman@techsingularity.net>
Date:   Fri, 20 Nov 2020 09:06:27 +0000
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>
Cc:     Vincent Guittot <vincent.guittot@...aro.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Juri Lelli <juri.lelli@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: [PATCH 1/4] sched/numa: Rename nr_running and break out the magic number

This is simply a preparation patch to make the following patches easier
to read. No functional change.

Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
---
 kernel/sched/fair.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 6d78b68847f9..5fbed29e4001 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1550,7 +1550,7 @@ struct task_numa_env {
 static unsigned long cpu_load(struct rq *rq);
 static unsigned long cpu_runnable(struct rq *rq);
 static unsigned long cpu_util(int cpu);
-static inline long adjust_numa_imbalance(int imbalance, int nr_running);
+static inline long adjust_numa_imbalance(int imbalance, int dst_running);
 
 static inline enum
 numa_type numa_classify(unsigned int imbalance_pct,
@@ -8991,7 +8991,9 @@ static inline void update_sd_lb_stats(struct lb_env *env, struct sd_lb_stats *sd
 	}
 }
 
-static inline long adjust_numa_imbalance(int imbalance, int nr_running)
+#define NUMA_IMBALANCE_MIN 2
+
+static inline long adjust_numa_imbalance(int imbalance, int dst_running)
 {
 	unsigned int imbalance_min;
 
@@ -8999,8 +9001,8 @@ static inline long adjust_numa_imbalance(int imbalance, int nr_running)
 	 * Allow a small imbalance based on a simple pair of communicating
 	 * tasks that remain local when the source domain is almost idle.
 	 */
-	imbalance_min = 2;
-	if (nr_running <= imbalance_min)
+	imbalance_min = NUMA_IMBALANCE_MIN;
+	if (dst_running <= imbalance_min)
 		return 0;
 
 	return imbalance;
-- 
2.26.2