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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 <arjan@linux.intel.com>
Cc: xiaoguangrong@cn.fujitsu.com
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: <stable@kernel.org> # .35.x, .34.x, .33.x
LKML-Reference: <4C6C5FA9.3000405@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Arjan van de Ven 2010-08-18 15:33:13 -07:00 committed by Ingo Molnar
parent 737480a0d5
commit ede1b42907
1 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
include/trace/events/timer.h
View File

@ -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 }))
);