sched_avg: add run queue averaging
Add code to calculate the run queue depth of a cpu and iowait
depth of the cpu.
The scheduler calls in to sched_update_nr_prod whenever there
is a runqueue change. This function maintains the runqueue average
and the iowait of that cpu in that time interval.
Whoever wants to know the runqueue average is expected to call
sched_get_nr_running_avg periodically to get the accumulated
runqueue and iowait averages for all the cpus.
Change-Id: Id8cb2ecf0ed479f090a83ccb72dd59c53fa73e0c
Signed-off-by: Jeff Ohlstein <johlstei@codeaurora.org>
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 2c9509d..1f13da3 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -142,6 +142,8 @@
extern unsigned long nr_iowait_cpu(int cpu);
extern unsigned long this_cpu_load(void);
+extern void sched_update_nr_prod(int cpu, unsigned long nr, bool inc);
+extern void sched_get_nr_running_avg(int *avg, int *iowait_avg);
extern void calc_global_load(unsigned long ticks);