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authorAnton Blanchard <anton@samba.org>2009-04-02 19:56:39 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-02 22:04:48 -0400
commit98f4ebb290a7dca8c48f27ec1d2cab8fa7982dad (patch)
tree4bad1464ee372de6789e95cb18b56ce54dd3ef27 /mm
parentd2caa3c549c74d6476e2c29e13bd4d0e7d21c7fe (diff)
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>
Diffstat (limited to 'mm')
-rw-r--r--mm/vmstat.c5
1 files changed, 3 insertions, 2 deletions
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)
891{ 891{
892 refresh_cpu_vm_stats(smp_processor_id()); 892 refresh_cpu_vm_stats(smp_processor_id());
893 schedule_delayed_work(&__get_cpu_var(vmstat_work), 893 schedule_delayed_work(&__get_cpu_var(vmstat_work),
894 sysctl_stat_interval); 894 round_jiffies_relative(sysctl_stat_interval));
895} 895}
896 896
897static void __cpuinit start_cpu_timer(int cpu) 897static void __cpuinit start_cpu_timer(int cpu)
@@ -899,7 +899,8 @@ static void __cpuinit start_cpu_timer(int cpu)
899 struct delayed_work *vmstat_work = &per_cpu(vmstat_work, cpu); 899 struct delayed_work *vmstat_work = &per_cpu(vmstat_work, cpu);
900 900
901 INIT_DELAYED_WORK_DEFERRABLE(vmstat_work, vmstat_update); 901 INIT_DELAYED_WORK_DEFERRABLE(vmstat_work, vmstat_update);
902 schedule_delayed_work_on(cpu, vmstat_work, HZ + cpu); 902 schedule_delayed_work_on(cpu, vmstat_work,
903 __round_jiffies_relative(HZ, cpu));
903} 904}
904 905
905/* 906/*