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Commit a7a4f8a7 authored by Paul Turner's avatar Paul Turner Committed by Ingo Molnar
Browse files

sched: Add sysctl_sched_shares_window 



Introduce a new sysctl for the shares window and disambiguate it from
sched_time_avg.

A 10ms window appears to be a good compromise between accuracy and performance.

Signed-off-by: default avatarPaul Turner <pjt@google.com>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20101115234938.112173964@google.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 67e86250

include/linux/sched.h

+1 −0
Original line number Diff line number Diff line
@@ -1900,6 +1900,7 @@ 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_timer_migration;

extern unsigned int sysctl_sched_shares_window;



int sched_proc_update_handler(struct ctl_table *table, int write,

		void __user *buffer, size_t *length,

kernel/sched_fair.c

+8 −1
Original line number Diff line number Diff line
@@ -89,6 +89,13 @@ 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;



static const struct sched_class fair_sched_class;



/**************************************************************
@@ -688,7 +695,7 @@ account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se) 
#if defined CONFIG_SMP && defined CONFIG_FAIR_GROUP_SCHED

static void update_cfs_load(struct cfs_rq *cfs_rq)

{

	u64 period = sched_avg_period();

	u64 period = sysctl_sched_shares_window;

	u64 now, delta;

	unsigned long load = cfs_rq->load.weight;

kernel/sysctl.c

+7 −0
Original line number Diff line number Diff line
@@ -332,6 +332,13 @@ static struct ctl_table kern_table[] = { 
		.mode		= 0644,

		.proc_handler	= proc_dointvec,

	},

	{

		.procname	= "sched_shares_window",

		.data		= &sysctl_sched_shares_window,

		.maxlen		= sizeof(unsigned int),

		.mode		= 0644,

		.proc_handler	= proc_dointvec,

	},

	{

		.procname	= "timer_migration",

		.data		= &sysctl_timer_migration,