From: Anton Blanchard Date: Thu, 2 Apr 2009 23:56:39 +0000 (-0700) Subject: mm: align vmstat_work's timer X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=98f4ebb290a7dca8c48f27ec1d2cab8fa7982dad;p=deliverable%2Flinux.git 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/vmstat.c b/mm/vmstat.c index 9826766f1274..66f6130976cb 100644 --- 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)); } /*