tracing/hrtimer: Print the hrtimer mode in the 'hrtimer_start' tracepoint

The 'hrtimer_start' tracepoint lacks the mode information. The mode is
important because consecutive starts can switch from ABS to REL or from
PINNED to non PINNED.

Append the mode field.

Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: keescook@chromium.org
Link: http://lkml.kernel.org/r/20171221104205.7269-10-anna-maria@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>

include/trace/events/timer.h

@@ -186,15 +186,16 @@ TRACE_EVENT(hrtimer_init,
  */
 TRACE_EVENT(hrtimer_start,
 
-	TP_PROTO(struct hrtimer *hrtimer),
+	TP_PROTO(struct hrtimer *hrtimer, enum hrtimer_mode mode),
 
-	TP_ARGS(hrtimer),
+	TP_ARGS(hrtimer, mode),
 
 	TP_STRUCT__entry(
 		__field( void *,	hrtimer		)
 		__field( void *,	function	)
 		__field( s64,		expires		)
 		__field( s64,		softexpires	)
+		__field( enum hrtimer_mode,	mode	)
 	),
 
 	TP_fast_assign(
@@ -202,12 +203,14 @@ TRACE_EVENT(hrtimer_start,
 		__entry->function	= hrtimer->function;
 		__entry->expires	= hrtimer_get_expires(hrtimer);
 		__entry->softexpires	= hrtimer_get_softexpires(hrtimer);
+		__entry->mode		= mode;
 	),
 
-	TP_printk("hrtimer=%p function=%pf expires=%llu softexpires=%llu",
-		  __entry->hrtimer, __entry->function,
+	TP_printk("hrtimer=%p function=%pf expires=%llu softexpires=%llu "
+		  "mode=%s", __entry->hrtimer, __entry->function,
 		  (unsigned long long) __entry->expires,
-		  (unsigned long long) __entry->softexpires)
+		  (unsigned long long) __entry->softexpires,
+		  decode_hrtimer_mode(__entry->mode))
 );
 
 /**

kernel/time/hrtimer.c

@@ -435,10 +435,11 @@ debug_init(struct hrtimer *timer, clockid_t clockid,
 	trace_hrtimer_init(timer, clockid, mode);
 }
 
-static inline void debug_activate(struct hrtimer *timer)
+static inline void debug_activate(struct hrtimer *timer,
+				  enum hrtimer_mode mode)
 {
 	debug_hrtimer_activate(timer);
-	trace_hrtimer_start(timer);
+	trace_hrtimer_start(timer, mode);
 }
 
 static inline void debug_deactivate(struct hrtimer *timer)
@@ -828,9 +829,10 @@ EXPORT_SYMBOL_GPL(hrtimer_forward);
  * Returns 1 when the new timer is the leftmost timer in the tree.
  */
 static int enqueue_hrtimer(struct hrtimer *timer,
-			   struct hrtimer_clock_base *base)
+			   struct hrtimer_clock_base *base,
+			   enum hrtimer_mode mode)
 {
-	debug_activate(timer);
+	debug_activate(timer, mode);
 
 	base->cpu_base->active_bases |= 1 << base->index;
 
@@ -953,7 +955,7 @@ void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
 	/* Switch the timer base, if necessary: */
 	new_base = switch_hrtimer_base(timer, base, mode & HRTIMER_MODE_PINNED);
 
-	leftmost = enqueue_hrtimer(timer, new_base);
+	leftmost = enqueue_hrtimer(timer, new_base, mode);
 	if (!leftmost)
 		goto unlock;
 
@@ -1222,7 +1224,7 @@ static void __run_hrtimer(struct hrtimer_cpu_base *cpu_base,
 	 */
 	if (restart != HRTIMER_NORESTART &&
 	    !(timer->state & HRTIMER_STATE_ENQUEUED))
-		enqueue_hrtimer(timer, base);
+		enqueue_hrtimer(timer, base, HRTIMER_MODE_ABS);
 
 	/*
 	 * Separate the ->running assignment from the ->state assignment.
@@ -1621,7 +1623,7 @@ static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
 		 * sort out already expired timers and reprogram the
 		 * event device.
 		 */
-		enqueue_hrtimer(timer, new_base);
+		enqueue_hrtimer(timer, new_base, HRTIMER_MODE_ABS);
 	}
 }