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vmstat: Reduce time interval to stat update on idle cpu

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It was noted that the vm stat shepherd runs every 2 seconds and that the
vmstat update is then scheduled 2 seconds in the future.

This yields an interval of double the time interval which is not desired.

Change the shepherd so that it does not delay the vmstat update on the
other cpu.  We stil have to use schedule_delayed_work since we are using a
delayed_work_struct but we can set the delay to 0.

Signed-off-by: Christoph Lameter <cl@linux.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Vinayak Menon <vinmenon@codeaurora.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2015-02-11 15:28:36 -08:00 committed by Linus Torvalds
parent 94f759d62b
commit 57c2e36b6f
1 changed files with 2 additions and 2 deletions
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4
mm/vmstat.c
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@ -1437,8 +1437,8 @@ static void vmstat_shepherd(struct work_struct *w)
if (need_update(cpu) &&
cpumask_test_and_clear_cpu(cpu, cpu_stat_off))
schedule_delayed_work_on(cpu, &per_cpu(vmstat_work, cpu),
__round_jiffies_relative(sysctl_stat_interval, cpu));
schedule_delayed_work_on(cpu,
&per_cpu(vmstat_work, cpu), 0);
put_online_cpus();