mm: align vmstat_work's timer

Even though vmstat_work is marked deferrable, there are still benefits to
aligning it.  For certain applications we want to keep OS jitter as low as
possible and aligning timers and work so they occur together can reduce
their overall impact.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 9826766f127447c5ee94aec4a86566258a3babf0..66f6130976cb65c569f41108507479a68ec0779c 100644 (file)
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -891,7 +891,7 @@ static void vmstat_update(struct work_struct *w)
 {
        refresh_cpu_vm_stats(smp_processor_id());
        schedule_delayed_work(&__get_cpu_var(vmstat_work),
-               sysctl_stat_interval);
+               round_jiffies_relative(sysctl_stat_interval));
 }
 
 static void __cpuinit start_cpu_timer(int cpu)
@@ -899,7 +899,8 @@ static void __cpuinit start_cpu_timer(int cpu)
        struct delayed_work *vmstat_work = &per_cpu(vmstat_work, cpu);
 
        INIT_DELAYED_WORK_DEFERRABLE(vmstat_work, vmstat_update);
-       schedule_delayed_work_on(cpu, vmstat_work, HZ + cpu);
+       schedule_delayed_work_on(cpu, vmstat_work,
+                                __round_jiffies_relative(HZ, cpu));
 }
 
 /*