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authorChristoph Lameter <clameter@sgi.com>2007-05-09 02:35:13 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-09 12:30:56 -0700
commit77461ab33229d48614402decfb1b2eaa6d446861 (patch)
treed2675ff079e887645ed25ae5f793aa907d53c66a
parentd1187ed21026fd512b87851d0ca26d9ae16f9059 (diff)
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: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/sysctl.c12
-rw-r--r--mm/vmstat.c4
2 files changed, 15 insertions, 1 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index f0664bd5011..4073353abd4 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -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))
{
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 9d824643a22..006eb762186 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -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)