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Commit 77461ab3 authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
Browse files

Make vm statistics update interval configurable 



Make it configurable.  Code in mm makes the vm statistics intervals
independent from the cache reaper use that opportunity to make it
configurable.

Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent d1187ed2

kernel/sysctl.c

+12 −0
Original line number Diff line number Diff line
@@ -77,6 +77,7 @@ extern int sysctl_drop_caches; 
extern int percpu_pagelist_fraction;

extern int compat_log;

extern int maps_protect;

extern int sysctl_stat_interval;



/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */

static int maxolduid = 65535;
@@ -857,6 +858,17 @@ static ctl_table vm_table[] = { 
		.extra2		= &one_hundred,

	},

#endif

#ifdef CONFIG_SMP

	{

		.ctl_name	= CTL_UNNUMBERED,

		.procname	= "stat_interval",

		.data		= &sysctl_stat_interval,

		.maxlen		= sizeof(sysctl_stat_interval),

		.mode		= 0644,

		.proc_handler	= &proc_dointvec_jiffies,

		.strategy	= &sysctl_jiffies,

	},

#endif

#if defined(CONFIG_X86_32) || \

   (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))

	{

mm/vmstat.c

+3 −1
Original line number Diff line number Diff line
@@ -641,11 +641,13 @@ const struct seq_operations vmstat_op = { 


#ifdef CONFIG_SMP

static DEFINE_PER_CPU(struct delayed_work, vmstat_work);

int sysctl_stat_interval __read_mostly = HZ;



static void vmstat_update(struct work_struct *w)

{

	refresh_cpu_vm_stats(smp_processor_id());

	schedule_delayed_work(&__get_cpu_var(vmstat_work), HZ);

	schedule_delayed_work(&__get_cpu_var(vmstat_work),

		sysctl_stat_interval);

}



static void __devinit start_cpu_timer(int cpu)