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timer: Move trace point to get proper index 

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

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

Therefore split debug_activate() and move the trace point into
enqueue_timer() after the new index has been calculated. The
debug_object_activate() call remains at the original place.

Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: fweisbec@gmail.com
Cc: peterz@infradead.org
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: https://lkml.kernel.org/r/20190321120921.16463-3-anna-maria@linutronix.de
This commit is contained in:
Anna-Maria Gleixner 2019-03-21 13:09:19 +01:00 committed by Thomas Gleixner
parent d6b87eaf10
commit dc1e7dc5ac
1 changed files with 4 additions and 9 deletions
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13
kernel/time/timer.c
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@ -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);
}