sched: Ensure cpu_power periodic update
With a lot of small tasks, the softirq sched is nearly never called
when no_hz is enabled. In this case load_balance() is mainly called
with the newly_idle mode which doesn't update the cpu_power.
Add a next_update field which ensure a maximum update period when
there is short activity.
Having stale cpu_power information can skew the load-balancing
decisions, this is cured by the guaranteed update.
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1323717668-2143-1-git-send-email-vincent.guittot@linaro.org
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 0e19595..92313a3f 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -905,6 +905,7 @@
* single CPU.
*/
unsigned int power, power_orig;
+ unsigned long next_update;
/*
* Number of busy cpus in this group.
*/