trace/osnoise: Add trace events for samples

Add trace events that fire at osnoise and timerlat sample generation, in
addition to the already existing noise and threshold events.

This allows processing the samples directly in the kernel, either with
ftrace triggers or with BPF.

Cc: John Kacur <jkacur@redhat.com>
Cc: Luis Goncalves <lgoncalv@redhat.com>
Link: https://lore.kernel.org/20250203090418.1458923-1-tglozar@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
Tested-by: Gabriele Monaco <gmonaco@redhat.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

1 files changed, 96 insertions, 0 deletions

diff --git a/include/trace/events/osnoise.h b/include/trace/events/osnoise.h
index a2379a4f0684..3f4273623801 100644
--- a/include/trace/events/osnoise.h
+++ b/include/trace/events/osnoise.h
@@ -3,9 +3,105 @@
 #define TRACE_SYSTEM osnoise
 
 #if !defined(_OSNOISE_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
+
+#ifndef _OSNOISE_TRACE_H
 #define _OSNOISE_TRACE_H
+/*
+ * osnoise sample structure definition. Used to store the statistics of a
+ * sample run.
+ */
+struct osnoise_sample {
+	u64			runtime;	/* runtime */
+	u64			noise;		/* noise */
+	u64			max_sample;	/* max single noise sample */
+	int			hw_count;	/* # HW (incl. hypervisor) interference */
+	int			nmi_count;	/* # NMIs during this sample */
+	int			irq_count;	/* # IRQs during this sample */
+	int			softirq_count;	/* # softirqs during this sample */
+	int			thread_count;	/* # threads during this sample */
+};
+
+#ifdef CONFIG_TIMERLAT_TRACER
+/*
+ * timerlat sample structure definition. Used to store the statistics of
+ * a sample run.
+ */
+struct timerlat_sample {
+	u64			timer_latency;	/* timer_latency */
+	unsigned int		seqnum;		/* unique sequence */
+	int			context;	/* timer context */
+};
+#endif // CONFIG_TIMERLAT_TRACER
+#endif // _OSNOISE_TRACE_H
 
 #include <linux/tracepoint.h>
+TRACE_EVENT(osnoise_sample,
+
+	TP_PROTO(struct osnoise_sample *s),
+
+	TP_ARGS(s),
+
+	TP_STRUCT__entry(
+		__field(	u64,		runtime	)
+		__field(	u64,		noise	)
+		__field(	u64,		max_sample	)
+		__field(	int,		hw_count	)
+		__field(	int,		irq_count	)
+		__field(	int,		nmi_count	)
+		__field(	int, 		softirq_count	)
+		__field(	int,		thread_count	)
+	),
+
+	TP_fast_assign(
+		__entry->runtime = s->runtime;
+		__entry->noise = s->noise;
+		__entry->max_sample = s->max_sample;
+		__entry->hw_count = s->hw_count;
+		__entry->irq_count = s->irq_count;
+		__entry->nmi_count = s->nmi_count;
+		__entry->softirq_count = s->softirq_count;
+		__entry->thread_count = s->thread_count;
+	),
+
+	TP_printk("runtime=%llu noise=%llu max_sample=%llu hw_count=%d"
+		  " irq_count=%d nmi_count=%d softirq_count=%d"
+		  " thread_count=%d",
+		  __entry->runtime,
+		  __entry->noise,
+		  __entry->max_sample,
+		  __entry->hw_count,
+		  __entry->irq_count,
+		  __entry->nmi_count,
+		  __entry->softirq_count,
+		  __entry->thread_count)
+);
+
+#ifdef CONFIG_TIMERLAT_TRACER
+TRACE_EVENT(timerlat_sample,
+
+	TP_PROTO(struct timerlat_sample *s),
+
+	TP_ARGS(s),
+
+	TP_STRUCT__entry(
+		__field(	u64,		timer_latency	)
+		__field(	unsigned int,	seqnum		)
+		__field(	int,		context		)
+	),
+
+	TP_fast_assign(
+		__entry->timer_latency = s->timer_latency;
+		__entry->seqnum = s->seqnum;
+		__entry->context = s->context;
+	),
+
+	TP_printk("timer_latency=%llu seqnum=%u context=%d",
+		  __entry->timer_latency,
+		  __entry->seqnum,
+		  __entry->context)
+);
+#endif // CONFIG_TIMERLAT_TRACER
+
 TRACE_EVENT(thread_noise,
 
 	TP_PROTO(struct task_struct *t, u64 start, u64 duration),