linux-kernel - [PATCH 2/4] timer: Move trace point to get proper index

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Date:   Thu, 21 Mar 2019 13:09:19 +0100
From:   Anna-Maria Gleixner <anna-maria@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     tglx@...utronix.de, fweisbec@...il.com, peterz@...radead.org,
        Anna-Maria Gleixner <anna-maria@...utronix.de>
Subject: [PATCH 2/4] timer: Move trace point to get proper index

When placing the timer_start trace point before timer wheel bucket
index is calculated, index information in trace point is useless.

It is not possible to simply move debug_activate() call after index
calculation, because debug_object_activate() function needs to be
called before touching the object.

Therefore split debug_activate() function and move trace point into
timer enqueue after index calculation. debug_object_activate() call
remains at the original place.

Signed-off-by: Anna-Maria Gleixner <anna-maria@...utronix.de>
---
 kernel/time/timer.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 2fce056f8a49..8d7918ae4d0c 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -536,6 +536,8 @@ static void enqueue_timer(struct timer_base *base, struct timer_list *timer,
 	hlist_add_head(&timer->entry, base->vectors + idx);
 	__set_bit(idx, base->pending_map);
 	timer_set_idx(timer, idx);
+
+	trace_timer_start(timer, timer->expires, timer->flags);
 }
 
 static void
@@ -757,13 +759,6 @@ static inline void debug_init(struct timer_list *timer)
 	trace_timer_init(timer);
 }
 
-static inline void
-debug_activate(struct timer_list *timer, unsigned long expires)
-{
-	debug_timer_activate(timer);
-	trace_timer_start(timer, expires, timer->flags);
-}
-
 static inline void debug_deactivate(struct timer_list *timer)
 {
 	debug_timer_deactivate(timer);
@@ -1037,7 +1032,7 @@ __mod_timer(struct timer_list *timer, unsigned long expires, unsigned int option
 		}
 	}
 
-	debug_activate(timer, expires);
+	debug_timer_activate(timer);
 
 	timer->expires = expires;
 	/*
@@ -1171,7 +1166,7 @@ void add_timer_on(struct timer_list *timer, int cpu)
 	}
 	forward_timer_base(base);
 
-	debug_activate(timer, timer->expires);
+	debug_timer_activate(timer);
 	internal_add_timer(base, timer);
 	raw_spin_unlock_irqrestore(&base->lock, flags);
 }
-- 
2.20.1