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mm: align vmstat_work's timer

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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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Anton Blanchard 2009-04-02 16:56:39 -07:00 committed by Linus Torvalds
parent d2caa3c549
commit 98f4ebb290
1 changed files with 3 additions and 2 deletions
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5
mm/vmstat.c
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@ -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));
}
/*