The following commit has been merged into the sched/hrtick branch of tip:
Commit-ID: 8e10f6b81afbf60e48bb4a71676ede4c7e374e79
Gitweb: https://git.kernel.org/tip/8e10f6b81afbf60e48bb4a71676ede4c7e374e79
Author: Thomas Gleixner <tglx@kernel.org>
AuthorDate: Tue, 24 Feb 2026 17:37:43 +01:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Fri, 27 Feb 2026 16:40:12 +01:00
hrtimer: Add hrtimer_rearm tracepoint
Analyzing the reprogramming of the clock event device is essential to debug
the behaviour of the hrtimer subsystem especially with the upcoming
deferred rearming scheme.
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260224163430.803669745@kernel.org
---
include/trace/events/timer.h | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/include/trace/events/timer.h b/include/trace/events/timer.h
index ab9a938..a54613f 100644
--- a/include/trace/events/timer.h
+++ b/include/trace/events/timer.h
@@ -325,6 +325,30 @@ DEFINE_EVENT(hrtimer_class, hrtimer_cancel,
);
/**
+ * hrtimer_rearm - Invoked when the clockevent device is rearmed
+ * @next_event: The next expiry time (CLOCK_MONOTONIC)
+ */
+TRACE_EVENT(hrtimer_rearm,
+
+ TP_PROTO(ktime_t next_event, bool deferred),
+
+ TP_ARGS(next_event, deferred),
+
+ TP_STRUCT__entry(
+ __field( s64, next_event )
+ __field( bool, deferred )
+ ),
+
+ TP_fast_assign(
+ __entry->next_event = next_event;
+ __entry->deferred = deferred;
+ ),
+
+ TP_printk("next_event=%llu deferred=%d",
+ (unsigned long long) __entry->next_event, __entry->deferred)
+);
+
+/**
* itimer_state - called when itimer is started or canceled
* @which: name of the interval timer
* @value: the itimers value, itimer is canceled if value->it_value is