linux-kernel - [PATCH 1/2] sched: Remove sysctl sched_child_runs

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Date:   Wed, 20 Sep 2023 15:00:24 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     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>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH 1/2] sched: Remove sysctl sched_child_runs_first.

The sched_child_runs_first knob is no longer connected since commit
   5e963f2bd4654 ("sched/fair: Commit to EEVDF")

Remove sched_child_runs_first.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 kernel/sched/debug.c |  1 -
 kernel/sched/fair.c  | 13 -------------
 kernel/sched/sched.h |  2 --
 3 files changed, 16 deletions(-)

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 4c3d0d9f3db63..132dfd1e6f475 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -864,7 +864,6 @@ static void sched_debug_header(struct seq_file *m)
 #define PN(x) \
 	SEQ_printf(m, "  .%-40s: %Ld.%06ld\n", #x, SPLIT_NS(x))
 	PN(sysctl_sched_base_slice);
-	P(sysctl_sched_child_runs_first);
 	P(sysctl_sched_features);
 #undef PN
 #undef P
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index fcf0c5bc8b478..75720008fdd21 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -78,12 +78,6 @@ unsigned int sysctl_sched_tunable_scaling = SCHED_TUNABLESCALING_LOG;
 unsigned int sysctl_sched_base_slice			= 750000ULL;
 static unsigned int normalized_sysctl_sched_base_slice	= 750000ULL;
 
-/*
- * After fork, child runs first. If set to 0 (default) then
- * parent will (try to) run first.
- */
-unsigned int sysctl_sched_child_runs_first __read_mostly;
-
 const_debug unsigned int sysctl_sched_migration_cost	= 500000UL;
 
 int sched_thermal_decay_shift;
@@ -145,13 +139,6 @@ static unsigned int sysctl_numa_balancing_promote_rate_limit = 65536;
 
 #ifdef CONFIG_SYSCTL
 static struct ctl_table sched_fair_sysctls[] = {
-	{
-		.procname       = "sched_child_runs_first",
-		.data           = &sysctl_sched_child_runs_first,
-		.maxlen         = sizeof(unsigned int),
-		.mode           = 0644,
-		.proc_handler   = proc_dointvec,
-	},
 #ifdef CONFIG_CFS_BANDWIDTH
 	{
 		.procname       = "sched_cfs_bandwidth_slice_us",
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 7e070dcf70747..9260120ed2a5c 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -100,8 +100,6 @@ extern __read_mostly int scheduler_running;
 extern unsigned long calc_load_update;
 extern atomic_long_t calc_load_tasks;
 
-extern unsigned int sysctl_sched_child_runs_first;
-
 extern void calc_global_load_tick(struct rq *this_rq);
 extern long calc_load_fold_active(struct rq *this_rq, long adjust);
 
-- 
2.40.1