diff options
| -rw-r--r-- | kernel/sysctl.c | 12 | ||||
| -rw-r--r-- | mm/vmstat.c | 4 |
2 files changed, 15 insertions, 1 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c index f0664bd5011c..4073353abd4f 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 9d824643a22f..006eb7621869 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) |