[tip: timers/core] tracing/timers: Add tracepoint for tracking timer base is_idle flag

[tip-bot2 for Anna-Maria Behnsen]

The following commit has been merged into the timers/core branch of tip:

Commit-ID:     b573c73101d8786446535b2ab28cbc8907bda9a9
Gitweb:        https://git.kernel.org/tip/b573c73101d8786446535b2ab28cbc8907bda9a9
Author:        Anna-Maria Behnsen <anna-maria@xxxxxxxxxxxxx>
AuthorDate:    Fri, 01 Dec 2023 10:26:27 +01:00
Committer:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Wed, 20 Dec 2023 16:49:38 +01:00

tracing/timers: Add tracepoint for tracking timer base is_idle flag

When debugging timer code the timer tracepoints are very important. There
is no tracepoint when the is_idle flag of the timer base changes. Instead
of always adding manually trace_printk(), add tracepoints which can be
easily enabled whenever required.

Signed-off-by: Anna-Maria Behnsen <anna-maria@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Frederic Weisbecker <frederic@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20231201092654.34614-6-anna-maria@xxxxxxxxxxxxx

---
 include/trace/events/timer.h | 20 ++++++++++++++++++++
 kernel/time/timer.c          | 14 +++++++++++---
 2 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/include/trace/events/timer.h b/include/trace/events/timer.h
index 99ada92..1ef58a0 100644
--- a/include/trace/events/timer.h
+++ b/include/trace/events/timer.h
@@ -142,6 +142,26 @@ DEFINE_EVENT(timer_class, timer_cancel,
 	TP_ARGS(timer)
 );
 
+TRACE_EVENT(timer_base_idle,
+
+	TP_PROTO(bool is_idle, unsigned int cpu),
+
+	TP_ARGS(is_idle, cpu),
+
+	TP_STRUCT__entry(
+		__field( bool,		is_idle	)
+		__field( unsigned int,	cpu	)
+	),
+
+	TP_fast_assign(
+		__entry->is_idle	= is_idle;
+		__entry->cpu		= cpu;
+	),
+
+	TP_printk("is_idle=%d cpu=%d",
+		  __entry->is_idle, __entry->cpu)
+);
+
 #define decode_clockid(type)						\
 	__print_symbolic(type,						\
 		{ CLOCK_REALTIME,	"CLOCK_REALTIME"	},	\
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index a81d793..ed8d606 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1950,7 +1950,10 @@ u64 get_next_timer_interrupt(unsigned long basej, u64 basem)
 
 	if (time_before_eq(nextevt, basej)) {
 		expires = basem;
-		base->is_idle = false;
+		if (base->is_idle) {
+			base->is_idle = false;
+			trace_timer_base_idle(false, base->cpu);
+		}
 	} else {
 		if (base->timers_pending)
 			expires = basem + (u64)(nextevt - basej) * TICK_NSEC;
@@ -1961,8 +1964,10 @@ u64 get_next_timer_interrupt(unsigned long basej, u64 basem)
 		 * logic is only maintained for the BASE_STD base, deferrable
 		 * timers may still see large granularity skew (by design).
 		 */
-		if ((expires - basem) > TICK_NSEC)
+		if ((expires - basem) > TICK_NSEC && !base->is_idle) {
 			base->is_idle = true;
+			trace_timer_base_idle(true, base->cpu);
+		}
 	}
 	raw_spin_unlock(&base->lock);
 
@@ -1984,7 +1989,10 @@ void timer_clear_idle(void)
 	 * sending the IPI a few instructions smaller for the cost of taking
 	 * the lock in the exit from idle path.
 	 */
-	base->is_idle = false;
+	if (base->is_idle) {
+		base->is_idle = false;
+		trace_timer_base_idle(false, smp_processor_id());
+	}
 }
 #endif