diff options
| author |   Christoph Lameter <clameter@sgi.com> | 2007-05-09 02:35:13 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-09 12:30:56 -0700 |
| commit | 77461ab33229d48614402decfb1b2eaa6d446861 (patch) | |
| tree | d2675ff079e887645ed25ae5f793aa907d53c66a | |
| parent | vmstat: use our own timer events (diff) | |
| download | linux-dev-77461ab33229d48614402decfb1b2eaa6d446861.tar.xz linux-dev-77461ab33229d48614402decfb1b2eaa6d446861.zip | |
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.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) |