linux-kernel - [tip: sched/core] sched/fair: Encapsulate set custom slice in a __setparam

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Message-ID: <173693263906.31546.14629399223607968639.tip-bot2@tip-bot2>
Date: Wed, 15 Jan 2025 09:17:19 -0000
From: "tip-bot2 for Vincent Guittot" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Vincent Guittot <vincent.guittot@...aro.org>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>, Phil Auld <pauld@...hat.com>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched/fair: Encapsulate set custom slice in a
 __setparam_fair() function

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     2cf9ac40073ddb6a70dd5ef94f1cf45501b696ed
Gitweb:        https://git.kernel.org/tip/2cf9ac40073ddb6a70dd5ef94f1cf45501b696ed
Author:        Vincent Guittot <vincent.guittot@...aro.org>
AuthorDate:    Sat, 11 Jan 2025 10:14:09 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 13 Jan 2025 14:10:22 +01:00

sched/fair: Encapsulate set custom slice in a __setparam_fair() function

Similarly to dl, create a __setparam_fair() function to set parameters
related to fair class and move it in the fair.c file.

No functional changes expected

Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Phil Auld <pauld@...hat.com>
Link: https://lore.kernel.org/r/20250110144656.484601-1-vincent.guittot@linaro.org
---
 kernel/sched/fair.c     | 19 +++++++++++++++++++
 kernel/sched/sched.h    |  2 ++
 kernel/sched/syscalls.c | 16 +++-------------
 3 files changed, 24 insertions(+), 13 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index b3418b5..7ec2587 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -37,6 +37,7 @@
 #include <linux/sched/cputime.h>
 #include <linux/sched/isolation.h>
 #include <linux/sched/nohz.h>
+#include <linux/sched/prio.h>
 
 #include <linux/cpuidle.h>
 #include <linux/interrupt.h>
@@ -51,6 +52,8 @@
 
 #include <asm/switch_to.h>
 
+#include <uapi/linux/sched/types.h>
+
 #include "sched.h"
 #include "stats.h"
 #include "autogroup.h"
@@ -5258,6 +5261,22 @@ static inline void update_misfit_status(struct task_struct *p, struct rq *rq) {}
 
 #endif /* CONFIG_SMP */
 
+void __setparam_fair(struct task_struct *p, const struct sched_attr *attr)
+{
+	struct sched_entity *se = &p->se;
+
+	p->static_prio = NICE_TO_PRIO(attr->sched_nice);
+	if (attr->sched_runtime) {
+		se->custom_slice = 1;
+		se->slice = clamp_t(u64, attr->sched_runtime,
+				      NSEC_PER_MSEC/10,   /* HZ=1000 * 10 */
+				      NSEC_PER_MSEC*100); /* HZ=100  / 10 */
+	} else {
+		se->custom_slice = 0;
+		se->slice = sysctl_sched_base_slice;
+	}
+}
+
 static void
 place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
 {
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index aef716c..300db6f 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -3500,6 +3500,8 @@ unsigned long scale_irq_capacity(unsigned long util, unsigned long irq, unsigned
 
 #endif /* !CONFIG_HAVE_SCHED_AVG_IRQ */
 
+extern void __setparam_fair(struct task_struct *p, const struct sched_attr *attr);
+
 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
 
 #define perf_domain_span(pd) (to_cpumask(((pd)->em_pd->cpus)))
diff --git a/kernel/sched/syscalls.c b/kernel/sched/syscalls.c
index 943406c..149e2c8 100644
--- a/kernel/sched/syscalls.c
+++ b/kernel/sched/syscalls.c
@@ -300,20 +300,10 @@ static void __setscheduler_params(struct task_struct *p,
 
 	p->policy = policy;
 
-	if (dl_policy(policy)) {
+	if (dl_policy(policy))
 		__setparam_dl(p, attr);
-	} else if (fair_policy(policy)) {
-		p->static_prio = NICE_TO_PRIO(attr->sched_nice);
-		if (attr->sched_runtime) {
-			p->se.custom_slice = 1;
-			p->se.slice = clamp_t(u64, attr->sched_runtime,
-					      NSEC_PER_MSEC/10,   /* HZ=1000 * 10 */
-					      NSEC_PER_MSEC*100); /* HZ=100  / 10 */
-		} else {
-			p->se.custom_slice = 0;
-			p->se.slice = sysctl_sched_base_slice;
-		}
-	}
+	else if (fair_policy(policy))
+		__setparam_fair(p, attr);
 
 	/* rt-policy tasks do not have a timerslack */
 	if (rt_or_dl_task_policy(p)) {