From ede1b4290781ae82ccf0f2ecc6dada8d3dd35779 Mon Sep 17 00:00:00 2001 From: Arjan van de Ven Date: Wed, 18 Aug 2010 15:33:13 -0700 Subject: [PATCH] tracing: Fix timer tracing PowerTOP would like to be able to trace timers. Unfortunately, the current timer tracing is not very useful: the actual timer function is not recorded in the trace at the start of timer execution. Although this is recorded for timer "start" time (when it gets armed), this is not useful; most timers get started early, and a tracer like PowerTOP will never see this event, but will only see the actual running of the timer. This patch just adds the function to the timer tracing; I've verified with PowerTOP that now it can get useful information about timers. Signed-off-by: Arjan van de Ven Cc: xiaoguangrong@cn.fujitsu.com Cc: Steven Rostedt Cc: Frederic Weisbecker Cc: Peter Zijlstra Cc: # .35.x, .34.x, .33.x LKML-Reference: <4C6C5FA9.3000405@linux.intel.com> Signed-off-by: Ingo Molnar --- include/trace/events/timer.h | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/include/trace/events/timer.h b/include/trace/events/timer.h index c624126a9c8a..425bcfe56c62 100644 --- a/include/trace/events/timer.h +++ b/include/trace/events/timer.h @@ -81,14 +81,16 @@ TRACE_EVENT(timer_expire_entry, TP_STRUCT__entry( __field( void *, timer ) __field( unsigned long, now ) + __field( void *, function) ), TP_fast_assign( __entry->timer = timer; __entry->now = jiffies; + __entry->function = timer->function; ), - TP_printk("timer=%p now=%lu", __entry->timer, __entry->now) + TP_printk("timer=%p function=%pf now=%lu", __entry->timer, __entry->function,__entry->now) ); /** @@ -200,14 +202,16 @@ TRACE_EVENT(hrtimer_expire_entry, TP_STRUCT__entry( __field( void *, hrtimer ) __field( s64, now ) + __field( void *, function) ), TP_fast_assign( __entry->hrtimer = hrtimer; __entry->now = now->tv64; + __entry->function = hrtimer->function; ), - TP_printk("hrtimer=%p now=%llu", __entry->hrtimer, + TP_printk("hrtimer=%p function=%pf now=%llu", __entry->hrtimer, __entry->function, (unsigned long long)ktime_to_ns((ktime_t) { .tv64 = __entry->now })) ); -- 2.34.1