[PATCH v2 5/7] sched: Add pelt_se tracepoint

[Qais Yousef <qais.yousef@arm.com>]

The new tracepoint allows tracking PELT signals at sched_entity level.
Which is supported in CFS tasks and taskgroups only.

Signed-off-by: Qais Yousef <qais.yousef@arm.com>
---
 include/trace/events/sched.h     |  4 ++++
 kernel/sched/fair.c              |  1 +
 kernel/sched/pelt.c              |  2 ++
 kernel/sched/sched_tracepoints.h | 13 +++++++++++++
 4 files changed, 20 insertions(+)

diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index 50346098e026..cbcb47972232 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -596,6 +596,10 @@ DECLARE_TRACE(pelt_rq,
 	TP_PROTO(int cpu, const char *path, struct sched_avg *avg),
 	TP_ARGS(cpu, path, avg));
 
+DECLARE_TRACE(pelt_se,
+	TP_PROTO(int cpu, const char *path, struct sched_entity *se),
+	TP_ARGS(cpu, path, se));
+
 #endif /* _TRACE_SCHED_H */
 
 /* This part must be outside protection */
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 34782e37387c..81036c34fd29 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3139,6 +3139,7 @@ static inline int propagate_entity_load_avg(struct sched_entity *se)
 	update_tg_cfs_runnable(cfs_rq, se, gcfs_rq);
 
 	sched_trace_pelt_cfs_rq(cfs_rq);
+	sched_trace_pelt_se(se);
 
 	return 1;
 }
diff --git a/kernel/sched/pelt.c b/kernel/sched/pelt.c
index 39418e80699f..75eea3b61a97 100644
--- a/kernel/sched/pelt.c
+++ b/kernel/sched/pelt.c
@@ -266,6 +266,7 @@ int __update_load_avg_blocked_se(u64 now, struct sched_entity *se)
 {
 	if (___update_load_sum(now, &se->avg, 0, 0, 0)) {
 		___update_load_avg(&se->avg, se_weight(se), se_runnable(se));
+		sched_trace_pelt_se(se);
 		return 1;
 	}
 
@@ -279,6 +280,7 @@ int __update_load_avg_se(u64 now, struct cfs_rq *cfs_rq, struct sched_entity *se
 
 		___update_load_avg(&se->avg, se_weight(se), se_runnable(se));
 		cfs_se_util_change(&se->avg);
+		sched_trace_pelt_se(se);
 		return 1;
 	}
 
diff --git a/kernel/sched/sched_tracepoints.h b/kernel/sched/sched_tracepoints.h
index 5f804629d3b7..d1992f04ee27 100644
--- a/kernel/sched/sched_tracepoints.h
+++ b/kernel/sched/sched_tracepoints.h
@@ -47,4 +47,17 @@ static inline void sched_trace_pelt_dl_rq(struct rq *rq) {}
 #endif /* CONFIG_SMP */
 
 
+static __always_inline void sched_trace_pelt_se(struct sched_entity *se)
+{
+	if (trace_pelt_se_enabled()) {
+		struct cfs_rq *gcfs_rq = group_cfs_rq(se);
+		struct cfs_rq *cfs_rq = cfs_rq_of(se);
+		int cpu = cpu_of(rq_of(cfs_rq));
+		char path[SCHED_TP_PATH_LEN];
+
+		cfs_rq_tg_path(gcfs_rq, path, SCHED_TP_PATH_LEN);
+		trace_pelt_se(cpu, path, se);
+	}
+}
+
 #endif /* __SCHED_TRACEPOINTS_H */
-- 
2.17.1