linux-kernel - [PATCH] sched_ext: Add trace point to track sched

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Message-ID: <20250226143327.231685-1-changwoo@igalia.com>
Date: Wed, 26 Feb 2025 23:33:27 +0900
From: Changwoo Min <changwoo@...lia.com>
To: tj@...nel.org,
	void@...ifault.com,
	arighi@...dia.com
Cc: kernel-dev@...lia.com,
	linux-kernel@...r.kernel.org,
	Changwoo Min <changwoo@...lia.com>
Subject: [PATCH] sched_ext: Add trace point to track sched_ext core events

Add tracing support, which may be useful for debugging sched_ext schedulers
that trigger a certain event.

Signed-off-by: Changwoo Min <changwoo@...lia.com>
---
 include/trace/events/sched_ext.h | 21 +++++++++++++++++++++
 kernel/sched/ext.c               |  4 ++++
 2 files changed, 25 insertions(+)

diff --git a/include/trace/events/sched_ext.h b/include/trace/events/sched_ext.h
index fe19da7315a9..88527b9316de 100644
--- a/include/trace/events/sched_ext.h
+++ b/include/trace/events/sched_ext.h
@@ -26,6 +26,27 @@ TRACE_EVENT(sched_ext_dump,
 	)
 );
 
+TRACE_EVENT(sched_ext_add_event,
+	    TP_PROTO(const char *name, int offset, __u64 added),
+	    TP_ARGS(name, offset, added),
+
+	TP_STRUCT__entry(
+		__string(name, name)
+		__field(	int,		offset		)
+		__field(	__u64,		added		)
+	),
+
+	TP_fast_assign(
+		__assign_str(name);
+		__entry->offset		= offset;
+		__entry->added		= added;
+	),
+
+	TP_printk("name %s offset %d added %llu",
+		  __get_str(name), __entry->offset, __entry->added
+	)
+);
+
 #endif /* _TRACE_SCHED_EXT_H */
 
 /* This part must be outside protection */
diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 986b655911df..825e79863057 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -1554,6 +1554,8 @@ static DEFINE_PER_CPU(struct scx_event_stats, event_stats_cpu);
  */
 #define scx_add_event(name, cnt) do {						\
 	this_cpu_add(event_stats_cpu.name, cnt);				\
+	trace_sched_ext_add_event(#name,					\
+				  offsetof(struct scx_event_stats, name), cnt);	\
 } while(0)
 
 /**
@@ -1565,6 +1567,8 @@ static DEFINE_PER_CPU(struct scx_event_stats, event_stats_cpu);
  */
 #define __scx_add_event(name, cnt) do {						\
 	__this_cpu_add(event_stats_cpu.name, cnt);				\
+	trace_sched_ext_add_event(#name,					\
+				  offsetof(struct scx_event_stats, name), cnt);	\
 } while(0)
 
 /**
-- 
2.48.1