From: Christoph Lameter Date: Wed, 9 May 2007 09:35:13 +0000 (-0700) Subject: Make vm statistics update interval configurable X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=77461ab33229d48614402decfb1b2eaa6d446861;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- 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)