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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 <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Anton Blanchard 2009-04-02 16:56:39 -07:00 • committed by Linus Torvalds
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));
}
/*