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hrtimer: Add tracepoint for hrtimers

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Add tracepoints which cover the life cycle of a hrtimer. The
tracepoints are integrated with the already existing debug_object
debug points as far as possible.

[ tglx: Fixed comments, made output conistent, easier to read and
  	parse. Fixed output for 32bit archs which do not use the
  	scalar representation of ktime_t. Hand current time to
  	trace_hrtimer_expiry_entry instead of calling get_time()
  	inside of the trace assignment. ]

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Anton Blanchard <anton@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Zhaolei <zhaolei@cn.fujitsu.com>
LKML-Reference: <4A7F8B2B.5020908@cn.fujitsu.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Xiao Guangrong
2009-08-10 10:51:23 +08:00
committed by Thomas Gleixner
parent 2b022e3d4b
commit c6a2a17702
2 changed files with 171 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

139
include/trace/events/timer.h
View File

@@ -5,6 +5,7 @@
#define _TRACE_TIMER_H
#include <linux/tracepoint.h>
#include <linux/hrtimer.h>
#include <linux/timer.h>
/**
@@ -131,6 +132,144 @@ TRACE_EVENT(timer_cancel,
TP_printk("timer %p", __entry->timer)
);
/**
* hrtimer_init - called when the hrtimer is initialized
* @timer: pointer to struct hrtimer
* @clockid: the hrtimers clock
* @mode: the hrtimers mode
*/
TRACE_EVENT(hrtimer_init,
TP_PROTO(struct hrtimer *timer, clockid_t clockid,
enum hrtimer_mode mode),
TP_ARGS(timer, clockid, mode),
TP_STRUCT__entry(
__field( void *, timer )
__field( clockid_t, clockid )
__field( enum hrtimer_mode, mode )
),
TP_fast_assign(
__entry->timer = timer;
__entry->clockid = clockid;
__entry->mode = mode;
),
TP_printk("hrtimer %p, clockid %s, mode %s", __entry->timer,
__entry->clockid == CLOCK_REALTIME ?
"CLOCK_REALTIME" : "CLOCK_MONOTONIC",
__entry->mode == HRTIMER_MODE_ABS ?
"HRTIMER_MODE_ABS" : "HRTIMER_MODE_REL")
);
/**
* hrtimer_start - called when the hrtimer is started
* @timer: pointer to struct hrtimer
*/
TRACE_EVENT(hrtimer_start,
TP_PROTO(struct hrtimer *timer),
TP_ARGS(timer),
TP_STRUCT__entry(
__field( void *, timer )
__field( void *, function )
__field( s64, expires )
__field( s64, softexpires )
),
TP_fast_assign(
__entry->timer = timer;
__entry->function = timer->function;
__entry->expires = hrtimer_get_expires(timer).tv64;
__entry->softexpires = hrtimer_get_softexpires(timer).tv64;
),
TP_printk("hrtimer %p, func %pf, expires %llu, softexpires %llu",
__entry->timer, __entry->function,
(unsigned long long)ktime_to_ns((ktime_t) {
.tv64 = __entry->expires }),
(unsigned long long)ktime_to_ns((ktime_t) {
.tv64 = __entry->softexpires }))
);
/**
* htimmer_expire_entry - called immediately before the hrtimer callback
* @timer: pointer to struct hrtimer
* @now: pointer to variable which contains current time of the
* timers base.
*
* Allows to determine the timer latency.
*/
TRACE_EVENT(hrtimer_expire_entry,
TP_PROTO(struct hrtimer *timer, ktime_t *now),
TP_ARGS(timer, now),
TP_STRUCT__entry(
__field( void *, timer )
__field( s64, now )
),
TP_fast_assign(
__entry->timer = timer;
__entry->now = now->tv64;
),
TP_printk("hrtimer %p, now %llu", __entry->timer,
(unsigned long long)ktime_to_ns((ktime_t) {
.tv64 = __entry->now }))
);
/**
* hrtimer_expire_exit - called immediately after the hrtimer callback returns
* @timer: pointer to struct hrtimer
*
* When used in combination with the hrtimer_expire_entry tracepoint we can
* determine the runtime of the callback function.
*/
TRACE_EVENT(hrtimer_expire_exit,
TP_PROTO(struct hrtimer *timer),
TP_ARGS(timer),
TP_STRUCT__entry(
__field( void *, timer )
),
TP_fast_assign(
__entry->timer = timer;
),
TP_printk("hrtimer %p", __entry->timer)
);
/**
* hrtimer_cancel - called when the hrtimer is canceled
* @timer: pointer to struct hrtimer
*/
TRACE_EVENT(hrtimer_cancel,
TP_PROTO(struct hrtimer *timer),
TP_ARGS(timer),
TP_STRUCT__entry(
__field( void *, timer )
),
TP_fast_assign(
__entry->timer = timer;
),
TP_printk("hrtimer %p", __entry->timer)
);
#endif /* _TRACE_TIMER_H */
/* This part must be outside protection */