nohz: Remove update_ts_time_stat from tick_nohz_start_idle
Michal Hocko [Thu, 1 Dec 2011 16:00:22 +0000 (17:00 +0100)]
There is no reason to call update_ts_time_stat from tick_nohz_start_idle
anymore (after e0e37c20 sched: Eliminate the ts->idle_lastupdate field)
when we updated idle_lastupdate unconditionally.

We haven't set idle_active yet and do not provide last_update_time so
the whole call end up being just 2 wasted branches.

Signed-off-by: Michal Hocko <mhocko@suse.cz>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Link: http://lkml.kernel.org/r/1322755222-6951-1-git-send-email-mhocko@suse.cz
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

kernel/time/tick-sched.c

index 7656642..8cfffd9 100644 (file)
@@ -182,11 +182,7 @@ static void tick_nohz_stop_idle(int cpu, ktime_t now)
 
 static ktime_t tick_nohz_start_idle(int cpu, struct tick_sched *ts)
 {
-       ktime_t now;
-
-       now = ktime_get();
-
-       update_ts_time_stats(cpu, ts, now, NULL);
+       ktime_t now = ktime_get();
 
        ts->idle_entrytime = now;
        ts->idle_active = 1;