sched: WALT: account cumulative window demand

Energy cost estimation has been a long lasting challenge for WALT
because WALT guides CPU frequency based on the CPU utilization of
previous window.  Consequently it's not possible to know newly
waking-up task's energy cost until WALT's end of the current window.

The WALT already tracks 'Previous Runnable Sum' (prev_runnable_sum)
and 'Cumulative Runnable Average' (cr_avg).  They are designed for
CPU frequency guidance and task placement but unfortunately both
are not suitable for the energy cost estimation.

It's because using prev_runnable_sum for energy cost calculation would
make us to account CPU and task's energy solely based on activity in the
previous window so for example, any task didn't have an activity in the
previous window will be accounted as a 'zero energy cost' task.
Energy estimation with cr_avg is what energy_diff() relies on at present.
However cr_avg can only represent instantaneous picture of energy cost
thus for example, if a CPU was fully occupied for an entire WALT window
and became idle just before window boundary, and if there is a wake-up,
energy_diff() accounts that CPU is a 'zero energy cost' CPU.

As a result, introduce a new accounting unit 'Cumulative Window Demand'.
The cumulative window demand tracks all the tasks' demands have seen in
current window which is neither instantaneous nor actual execution time.
Because task demand represents estimated scaled execution time when the
task runs a full window, accumulation of all the demands represents
predicted CPU load at the end of window.

Thus we can estimate CPU's frequency at the end of current WALT window
with the cumulative window demand.

The use of prev_runnable_sum for the CPU frequency guidance and cr_avg
for the task placement have not changed and these are going to be used
for both purpose while this patch aims to add an additional statistics.

Change-Id: I9908c77ead9973a26dea2b36c001c2baf944d4f5
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 8d3712107e61..deba080af845 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -690,6 +690,7 @@ struct rq {
 	u64 cur_irqload;
 	u64 avg_irqload;
 	u64 irqload_ts;
+	u64 cum_window_demand;
 #endif /* CONFIG_SCHED_WALT */
 
 
@@ -2101,6 +2102,17 @@ static inline void cpufreq_update_util(struct rq *rq, unsigned int flags) {}
 static inline void cpufreq_update_this_cpu(struct rq *rq, unsigned int flags) {}
 #endif /* CONFIG_CPU_FREQ */
 
+#ifdef CONFIG_SCHED_WALT
+
+static inline bool
+walt_task_in_cum_window_demand(struct rq *rq, struct task_struct *p)
+{
+	return cpu_of(rq) == task_cpu(p) &&
+	       (p->on_rq || p->last_sleep_ts >= rq->window_start);
+}
+
+#endif /* CONFIG_SCHED_WALT */
+
 #ifdef arch_scale_freq_capacity
 #ifndef arch_scale_freq_invariant
 #define arch_scale_freq_invariant()     (true)