sched: Add ftrace events for entity load-tracking

Adds ftrace events for key variables related to the entity
load-tracking to help debugging scheduler behaviour. Allows tracing
of load contribution and runqueue residency ratio for both entities
and runqueues as well as entity CPU usage ratio.

Signed-off-by: Morten Rasmussen <Morten.Rasmussen@arm.com>

1 files changed, 125 insertions, 0 deletions

diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index e5586caff67..496445daa54 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -430,6 +430,131 @@ TRACE_EVENT(sched_pi_setprio,
 			__entry->oldprio, __entry->newprio)
 );
 
+/*
+ * Tracepoint for showing tracked load contribution.
+ */
+TRACE_EVENT(sched_task_load_contrib,
+
+	TP_PROTO(struct task_struct *tsk, unsigned long load_contrib),
+
+	TP_ARGS(tsk, load_contrib),
+
+	TP_STRUCT__entry(
+		__array(char, comm, TASK_COMM_LEN)
+		__field(pid_t, pid)
+		__field(unsigned long, load_contrib)
+	),
+
+	TP_fast_assign(
+		memcpy(__entry->comm, tsk->comm, TASK_COMM_LEN);
+		__entry->pid            = tsk->pid;
+		__entry->load_contrib   = load_contrib;
+	),
+
+	TP_printk("comm=%s pid=%d load_contrib=%lu",
+			__entry->comm, __entry->pid,
+			__entry->load_contrib)
+);
+
+/*
+ * Tracepoint for showing tracked task runnable ratio [0..1023].
+ */
+TRACE_EVENT(sched_task_runnable_ratio,
+
+	TP_PROTO(struct task_struct *tsk, unsigned long ratio),
+
+	TP_ARGS(tsk, ratio),
+
+	TP_STRUCT__entry(
+		__array(char, comm, TASK_COMM_LEN)
+		__field(pid_t, pid)
+		__field(unsigned long, ratio)
+	),
+
+	TP_fast_assign(
+	memcpy(__entry->comm, tsk->comm, TASK_COMM_LEN);
+		__entry->pid   = tsk->pid;
+		__entry->ratio = ratio;
+	),
+
+	TP_printk("comm=%s pid=%d ratio=%lu",
+			__entry->comm, __entry->pid,
+			__entry->ratio)
+);
+
+/*
+ * Tracepoint for showing tracked rq runnable ratio [0..1023].
+ */
+TRACE_EVENT(sched_rq_runnable_ratio,
+
+	TP_PROTO(int cpu, unsigned long ratio),
+
+	TP_ARGS(cpu, ratio),
+
+	TP_STRUCT__entry(
+		__field(int, cpu)
+		__field(unsigned long, ratio)
+	),
+
+	TP_fast_assign(
+		__entry->cpu   = cpu;
+		__entry->ratio = ratio;
+	),
+
+	TP_printk("cpu=%d ratio=%lu",
+			__entry->cpu,
+			__entry->ratio)
+);
+
+/*
+ * Tracepoint for showing tracked rq runnable load.
+ */
+TRACE_EVENT(sched_rq_runnable_load,
+
+	TP_PROTO(int cpu, u64 load),
+
+	TP_ARGS(cpu, load),
+
+	TP_STRUCT__entry(
+		__field(int, cpu)
+		__field(u64, load)
+	),
+
+	TP_fast_assign(
+		__entry->cpu  = cpu;
+		__entry->load = load;
+	),
+
+	TP_printk("cpu=%d load=%llu",
+			__entry->cpu,
+			__entry->load)
+);
+
+/*
+ * Tracepoint for showing tracked task cpu usage ratio [0..1023].
+ */
+TRACE_EVENT(sched_task_usage_ratio,
+
+	TP_PROTO(struct task_struct *tsk, unsigned long ratio),
+
+	TP_ARGS(tsk, ratio),
+
+	TP_STRUCT__entry(
+		__array(char, comm, TASK_COMM_LEN)
+		__field(pid_t, pid)
+		__field(unsigned long, ratio)
+	),
+
+	TP_fast_assign(
+	memcpy(__entry->comm, tsk->comm, TASK_COMM_LEN);
+		__entry->pid   = tsk->pid;
+		__entry->ratio = ratio;
+	),
+
+	TP_printk("comm=%s pid=%d ratio=%lu",
+			__entry->comm, __entry->pid,
+			__entry->ratio)
+);
 #endif /* _TRACE_SCHED_H */
 
 /* This part must be outside protection */