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>

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index f0664bd..4073353 100644 (file)
--- 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 9d82464..006eb76 100644 (file)
--- 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)