From 43781a20da11672cde097325daa5c1fbd73618ed Mon Sep 17 00:00:00 2001
From: Mika <kontakt@donau2space.de>
Date: Wed, 3 Dec 2025 13:44:59 +0000
Subject: [PATCH] Add patches/tracepoint_integration.patch

---
 patches/tracepoint_integration.patch | 118 +++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 patches/tracepoint_integration.patch

diff --git a/patches/tracepoint_integration.patch b/patches/tracepoint_integration.patch
new file mode 100644
index 0000000..3483089
--- /dev/null
+++ b/patches/tracepoint_integration.patch
@@ -0,0 +1,118 @@
+diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
+index e1f8f7b06e3d..f3a7b4a6c2dd 100644
+--- a/kernel/time/clocksource.c
++++ b/kernel/time/clocksource.c
+@@ -23,6 +23,7 @@
+ #include <linux/moduleparam.h>
+ #include <linux/hardirq.h>
+ #include <linux/clocksource.h>
++#include <linux/ktime.h>
+ #include <linux/workqueue.h>
+ #include <linux/suspend.h>
+ #include <linux/mutex.h>
+@@ -38,6 +39,7 @@
+ #include <trace/events/timer.h>
+ #include <trace/events/sched.h>
+ #include <trace/events/clocksource.h>
++#include <trace/events/clocksource_switch.h>
+ 
+ static DEFINE_SPINLOCK(clocksource_lock);
+ 
+@@ -246,6 +248,11 @@ void do_clocksource_switch(struct clocksource *cs)
+ 	struct clocksource *old_clock;
+ 	unsigned long flags;
+ 	struct clocksource *old = curr_clocksource;
++	struct trace_point_data tp_data = {
++		.timestamp_switch = ktime_get_ns(),
++		.timestamp_baseline_recalc = 0,
++		.timestamp_read = 0,
++	};
+ 
+ 	if (!cs)
+ 		return;
+@@ -320,6 +327,7 @@ void do_clocksource_switch(struct clocksource *cs)
+ 
+ 	clocksource_stop_watchdog(old);
+ 	clocksource_watchdog_lock(flags);
++
+ 	__clocksource_change_rating(cs, RATING_INTERNAL);
+ 
+ 	clocksource_select();
+@@ -343,6 +351,8 @@ void do_clocksource_switch(struct clocksource *cs)
+ 	cs->flags &= ~CLOCK_SOURCE_SUSPENDED;
+ 	cs->enable(cs);
+ 
++	tp_data.timestamp_baseline_recalc = ktime_get_ns();
++
+ 	clocksource_start_watchdog(cs);
+ 
+ 	if (old)
+@@ -352,11 +362,22 @@ void do_clocksource_switch(struct clocksource *cs)
+ 	write_seqcount_begin(&clock->seq);
+ 	clock->clocksource = cs;
+ 	clock->cycle_last = curr_clocksource->read(curr_clocksource);
++	tp_data.timestamp_read = ktime_get_ns();
+ 	clock->mask = curr_clocksource->mask;
+ 	clock->mult = curr_clocksource->mult;
+ 	clock->shift = curr_clocksource->shift;
+ 	write_seqcount_end(&clock->seq);
+ 
+ 	raw_spin_unlock_irqrestore(&clock->lock, flags);
++
++	if (!tp_data.timestamp_baseline_recalc)
++		tp_data.timestamp_baseline_recalc = tp_data.timestamp_switch;
++
++	if (!tp_data.timestamp_read)
++		tp_data.timestamp_read = tp_data.timestamp_baseline_recalc;
++
++	trace_clocksource_switch_latency(&tp_data);
+ }
+diff --git a/include/trace/events/clocksource_switch.h b/include/trace/events/clocksource_switch.h
+new file mode 100644
+index 000000000000..5e4c1a1d3c31
+--- /dev/null
++++ b/include/trace/events/clocksource_switch.h
+@@ -0,0 +1,53 @@
++#undef TRACE_SYSTEM
++#define TRACE_SYSTEM clocksource_switch
++
++#if !defined(_TRACE_CLOCKSOURCE_SWITCH_H) || defined(TRACE_HEADER_MULTI_READ)
++#define _TRACE_CLOCKSOURCE_SWITCH_H
++
++#include <linux/types.h>
++#include <linux/tracepoint.h>
++
++struct trace_point_data {
++	u64 timestamp_switch;
++	u64 timestamp_baseline_recalc;
++	u64 timestamp_read;
++};
++
++TRACE_EVENT(clocksource_switch_latency,
++	TP_PROTO(const struct trace_point_data *tp),
++	TP_ARGS(tp),
++	TP_STRUCT__entry(
++		__field(u64, timestamp_switch)
++		__field(u64, timestamp_baseline_recalc)
++		__field(u64, timestamp_read)
++	),
++	TP_fast_assign(
++		__entry->timestamp_switch = tp->timestamp_switch;
++		__entry->timestamp_baseline_recalc = tp->timestamp_baseline_recalc;
++		__entry->timestamp_read = tp->timestamp_read;
++	),
++	TP_printk("switch=%llu ns baseline=%llu ns read=%llu ns",
++		  __entry->timestamp_switch,
++		  __entry->timestamp_baseline_recalc,
++		  __entry->timestamp_read)
++);
++
++#endif /* _TRACE_CLOCKSOURCE_SWITCH_H */
++
++#undef TRACE_INCLUDE_PATH
++#define TRACE_INCLUDE_PATH trace/events
++
++#undef TRACE_INCLUDE_FILE
++#define TRACE_INCLUDE_FILE clocksource_switch
++
++#include <trace/define_trace.h>