Messages in this thread Patch in this message | | | Date | Wed, 1 Apr 2009 21:48:46 +1100 | From | Anton Blanchard <> | Subject | [PATCH] Align vmstat_work |
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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> ---
diff --git a/mm/vmstat.c b/mm/vmstat.c index 9114974..493c89d 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -898,7 +898,7 @@ 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) @@ -906,7 +906,8 @@ 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)); } /*
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