DEBUG: schedtune: add tracepoint on P-E space filtering

Change-Id: I2947dd97573a41a8a7cac8a6f6467f3341f8009f
Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com>

2 files changed, 52 insertions, 4 deletions

diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index b5e8cf5c955d..32ce2e7f864e 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -823,6 +823,34 @@ TRACE_EVENT(sched_tune_tasks_update,
 		__entry->boost, __entry->max_boost)
 );
 
+/*
+ * Tracepoint for schedtune_tasks_update
+ */
+TRACE_EVENT(sched_tune_filter,
+
+	TP_PROTO(int nrg_delta, int cap_delta, int nrg_payoff, int region),
+
+	TP_ARGS(nrg_delta, cap_delta, nrg_payoff, region),
+
+	TP_STRUCT__entry(
+		__field( int,	nrg_delta	)
+		__field( int,	cap_delta	)
+		__field( int,	nrg_payoff	)
+		__field( int,	region		)
+	),
+
+	TP_fast_assign(
+		__entry->nrg_delta	= nrg_delta;
+		__entry->cap_delta	= cap_delta;
+		__entry->nrg_payoff	= nrg_payoff;
+		__entry->region		= region;
+	),
+
+	TP_printk("nrg_delta=%d cap_delta=%d nrg_payoff=%d region=%d",
+		__entry->nrg_delta, __entry->cap_delta,
+		__entry->nrg_payoff, __entry->region)
+);
+
 #endif /* _TRACE_SCHED_H */
 
 /* This part must be outside protection */
diff --git a/kernel/sched/tune.c b/kernel/sched/tune.c
index 4274e711266e..9760a3f0b5cd 100644
--- a/kernel/sched/tune.c
+++ b/kernel/sched/tune.c
@@ -137,6 +137,12 @@ __schedtune_accept_deltas(int nrg_delta, int cap_delta,
 		 */
 		energy_payoff  = cap_delta * threshold_gains[perf_boost_idx].nrg_gain;
 		energy_payoff -= nrg_delta * threshold_gains[perf_boost_idx].cap_gain;
+
+		trace_sched_tune_filter(
+				threshold_gains[perf_boost_idx].nrg_gain,
+				threshold_gains[perf_boost_idx].cap_gain,
+				energy_payoff, 8);
+
 		return energy_payoff;
 	}
 
@@ -150,6 +156,12 @@ __schedtune_accept_deltas(int nrg_delta, int cap_delta,
 		 */
 		energy_payoff  = nrg_delta * threshold_gains[perf_constrain_idx].cap_gain;
 		energy_payoff -= cap_delta * threshold_gains[perf_constrain_idx].nrg_gain;
+
+		trace_sched_tune_filter(
+				threshold_gains[perf_constrain_idx].nrg_gain,
+				threshold_gains[perf_constrain_idx].cap_gain,
+				energy_payoff, 6);
+
 		return energy_payoff;
 	}
 
@@ -220,12 +232,16 @@ schedtune_accept_deltas(int nrg_delta, int cap_delta, struct task_struct *task)
 	int perf_constrain_idx;
 
 	/* Optimal (O) region */
-	if (nrg_delta < 0 && cap_delta > 0)
+	if (nrg_delta < 0 && cap_delta > 0) {
+		trace_sched_tune_filter(0, 0, 1, 0);
 		return INT_MAX;
+	}
 
 	/* Suboptimal (S) region */
-	if (nrg_delta > 0 && cap_delta < 0)
+	if (nrg_delta > 0 && cap_delta < 0) {
+		trace_sched_tune_filter(0, 0, -1, 5);
 		return -INT_MAX;
+	}
 
 	/* Get task specific perf Boost/Constraints indexes */
 	rcu_read_lock();
@@ -620,12 +636,16 @@ int
 schedtune_accept_deltas(int nrg_delta, int cap_delta) {
 
 	/* Optimal (O) region */
-	if (nrg_delta < 0 && cap_delta > 0)
+	if (nrg_delta < 0 && cap_delta > 0) {
+		trace_printk("schedtune_filter: region=O ngain=0 pgain=0 nrg_payoff=-1");
 		return INT_MAX;
+	}
 
 	/* Suboptimal (S) region */
-	if (nrg_delta > 0 && cap_delta < 0)
+	if (nrg_delta > 0 && cap_delta < 0) {
+		trace_printk("schedtune_filter: region=S ngain=0 pgain=0 nrg_payoff=1");
 		return -INT_MAX;
+	}
 
 	return __schedtune_accept_deltas(nrg_delta, cap_delta,
 			perf_boost_idx, perf_constrain_idx);