linux-kernel - [PATCH 4/5] sched/fair: add a func _sched

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Date: Wed, 17 Jan 2024 16:57:14 +0800
From: alexs@...nel.org
To: Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>,
	Mel Gorman <mgorman@...e.de>,
	Daniel Bristot de Oliveira <bristot@...hat.com>,
	Valentin Schneider <vschneid@...hat.com>,
	linux-kernel@...r.kernel.org
Cc: Alex Shi <alexs@...nel.org>
Subject: [PATCH 4/5] sched/fair: add a func _sched_asym

From: Alex Shi <alexs@...nel.org>

Use this func in sched_asym and other path to simply code.
No function change.

Signed-off-by: Alex Shi <alexs@...nel.org>
To: Valentin Schneider <vschneid@...hat.com>
To: Vincent Guittot <vincent.guittot@...aro.org>
To: Peter Zijlstra <peterz@...radead.org>
To: Ingo Molnar <mingo@...hat.com>
---
 kernel/sched/fair.c | 27 +++++++++++++--------------
 1 file changed, 13 insertions(+), 14 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index ebd659af2d78..96163ab69ae0 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -9745,6 +9745,14 @@ static bool sched_use_asym_prio(struct sched_domain *sd, int cpu)
 		(sd->flags & SD_SHARE_CPUCAPACITY) || is_core_idle(cpu);
 }
 
+static inline bool _sched_asym(struct sched_domain *sd,
+			int dst_cpu, int repl_cpu)
+{
+	/* Ensure that the whole local core is idle, if applicable. */
+	return sched_use_asym_prio(sd, dst_cpu) &&
+			sched_asym_prefer(dst_cpu, repl_cpu);
+}
+
 /**
  * sched_asym - Check if the destination CPU can do asym_packing load balance
  * @env:	The load balancing environment
@@ -9768,20 +9776,13 @@ static bool sched_use_asym_prio(struct sched_domain *sd, int cpu)
 static inline bool
 sched_asym(struct lb_env *env, struct sg_lb_stats *sgs, struct sched_group *group)
 {
-	/* Ensure that the whole local core is idle, if applicable. */
-	if (!sched_use_asym_prio(env->sd, env->dst_cpu))
-		return false;
-
 	/*
 	 * CPU priorities does not make sense for SMT cores with more than one
 	 * busy sibling.
 	 */
-	if (group->flags & SD_SHARE_CPUCAPACITY) {
-		if (sgs->group_weight - sgs->idle_cpus != 1)
-			return false;
-	}
-
-	return sched_asym_prefer(env->dst_cpu, group->asym_prefer_cpu);
+	return !(group->flags & SD_SHARE_CPUCAPACITY &&
+			sgs->group_weight - sgs->idle_cpus != 1) &&
+		_sched_asym(env->sd, env->dst_cpu, group->asym_prefer_cpu);
 }
 
 /* One group has more than one SMT CPU while the other group does not */
@@ -11036,8 +11037,7 @@ static struct rq *find_busiest_queue(struct lb_env *env,
 		 * SMT cores with more than one busy sibling.
 		 */
 		if ((env->sd->flags & SD_ASYM_PACKING) &&
-		    sched_use_asym_prio(env->sd, i) &&
-		    sched_asym_prefer(i, env->dst_cpu) &&
+		    _sched_asym(env->sd, i, env->dst_cpu) &&
 		    nr_running == 1)
 			continue;
 
@@ -11907,8 +11907,7 @@ static void nohz_balancer_kick(struct rq *rq)
 		 * preferred CPU must be idle.
 		 */
 		for_each_cpu_and(i, sched_domain_span(sd), nohz.idle_cpus_mask) {
-			if (sched_use_asym_prio(sd, i) &&
-			    sched_asym_prefer(i, cpu)) {
+			if (_sched_asym(sd, i, cpu)) {
 				flags = NOHZ_STATS_KICK | NOHZ_BALANCE_KICK;
 				goto unlock;
 			}
-- 
2.43.0