linux-kernel - [PATCH] sched/fair: Kill the unused sched_shares_window

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Message-Id: <20161019141059.26408-1-matt@codeblueprint.co.uk>
Date:   Wed, 19 Oct 2016 15:10:59 +0100
From:   Matt Fleming <matt@...eblueprint.co.uk>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Ingo Molnar <mingo@...nel.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Paul Turner <pjt@...gle.com>,
        Mike Galbraith <umgwanakikbuti@...il.com>
Subject: [PATCH] sched/fair: Kill the unused sched_shares_window_ns tunable

The last user of this tunable was removed in 2012 in commit 8295836
("sched: Replace update_shares weight distribution with per-entity
computation").

Delete it since its very existence confuses people.

Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Dietmar Eggemann <dietmar.eggemann@....com>
Cc: Paul Turner <pjt@...gle.com>
Cc: Mike Galbraith <umgwanakikbuti@...il.com>
Signed-off-by: Matt Fleming <matt@...eblueprint.co.uk>
---
 include/linux/sched/sysctl.h | 1 -
 kernel/sched/fair.c          | 7 -------
 kernel/sysctl.c              | 7 -------
 3 files changed, 15 deletions(-)

diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h
index 22db1e63707e..441145351301 100644
--- a/include/linux/sched/sysctl.h
+++ b/include/linux/sched/sysctl.h
@@ -36,7 +36,6 @@ extern unsigned int sysctl_numa_balancing_scan_size;
 extern unsigned int sysctl_sched_migration_cost;
 extern unsigned int sysctl_sched_nr_migrate;
 extern unsigned int sysctl_sched_time_avg;
-extern unsigned int sysctl_sched_shares_window;
 
 int sched_proc_update_handler(struct ctl_table *table, int write,
 		void __user *buffer, size_t *length,
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 543b2f291152..f026050c15cc 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -93,13 +93,6 @@ unsigned int normalized_sysctl_sched_wakeup_granularity = 1000000UL;
 
 const_debug unsigned int sysctl_sched_migration_cost = 500000UL;
 
-/*
- * The exponential sliding  window over which load is averaged for shares
- * distribution.
- * (default: 10msec)
- */
-unsigned int __read_mostly sysctl_sched_shares_window = 10000000UL;
-
 #ifdef CONFIG_CFS_BANDWIDTH
 /*
  * Amount of runtime to allocate from global (tg) to local (per-cfs_rq) pool
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index a13bbdaab47d..2a361dc6e1eb 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -347,13 +347,6 @@ static struct ctl_table kern_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec,
 	},
-	{
-		.procname	= "sched_shares_window_ns",
-		.data		= &sysctl_sched_shares_window,
-		.maxlen		= sizeof(unsigned int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
-	},
 #ifdef CONFIG_SCHEDSTATS
 	{
 		.procname	= "sched_schedstats",
-- 
2.10.0