#include <linux/tracepoint.h>
#include <linux/hrtimer.h>
#include <linux/timer.h>
#include <trace/define_trace.h>

Macros
#define	TRACE_SYSTEM timer

#define	_TRACE_TIMER_H

Functions
	DECLARE_EVENT_CLASS (timer_class, TP_PROTO(struct timer_list timer), TP_ARGS(timer), TP_STRUCT__entry(__field(void , timer)), TP_fast_assign(__entry->timer=timer;), TP_printk("timer=%p", __entry->timer))

	DEFINE_EVENT (timer_class, timer_init, TP_PROTO(struct timer_list *timer),)

	TRACE_EVENT (timer_start, TP_PROTO(struct timer_list timer, unsigned long expires), TP_ARGS(timer, expires), TP_STRUCT__entry(__field(void , timer) __field(void *, function) __field(unsigned long, expires) __field(unsigned long, now)), TP_fast_assign(__entry->timer=timer;__entry->function=timer->function;__entry->expires=expires;__entry->now=jiffies;), TP_printk("timer=%p function=%pf expires=%lu [timeout=%ld]", __entry->timer, __entry->function, __entry->expires,(long) __entry->expires-__entry->now))

	TRACE_EVENT (timer_expire_entry, TP_PROTO(struct timer_list timer), TP_ARGS(timer), 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 function=%pf now=%lu", __entry->timer, __entry->function, __entry->now))

	DEFINE_EVENT (timer_class, timer_expire_exit, TP_PROTO(struct timer_list *timer),)

	DEFINE_EVENT (timer_class, timer_cancel, TP_PROTO(struct timer_list *timer),)

	TRACE_EVENT (hrtimer_init, TP_PROTO(struct hrtimer hrtimer, clockid_t clockid, enum hrtimer_mode mode), TP_ARGS(hrtimer, clockid, mode), TP_STRUCT__entry(__field(void , hrtimer) __field(clockid_t, clockid) __field(enum hrtimer_mode, mode)), TP_fast_assign(__entry->hrtimer=hrtimer;__entry->clockid=clockid;__entry->mode=mode;), TP_printk("hrtimer=%p clockid=%s mode=%s", __entry->hrtimer, __entry->clockid==CLOCK_REALTIME?"CLOCK_REALTIME":"CLOCK_MONOTONIC", __entry->mode==HRTIMER_MODE_ABS?"HRTIMER_MODE_ABS":"HRTIMER_MODE_REL"))

	TRACE_EVENT (hrtimer_start, TP_PROTO(struct hrtimer hrtimer), TP_ARGS(hrtimer), TP_STRUCT__entry(__field(void , hrtimer) __field(void *, function) __field(s64, expires) __field(s64, softexpires)), TP_fast_assign(__entry->hrtimer=hrtimer;__entry->function=hrtimer->function;__entry->expires=hrtimer_get_expires(hrtimer).tv64;__entry->softexpires=hrtimer_get_softexpires(hrtimer).tv64;), TP_printk("hrtimer=%p function=%pf expires=%llu softexpires=%llu", __entry->hrtimer, __entry->function,(unsigned long long) ktime_to_ns((ktime_t){.tv64=__entry->expires}),(unsigned long long) ktime_to_ns((ktime_t){.tv64=__entry->softexpires})))

	TRACE_EVENT (hrtimer_expire_entry, TP_PROTO(struct hrtimer hrtimer, ktime_t now), TP_ARGS(hrtimer, now), 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 function=%pf now=%llu", __entry->hrtimer, __entry->function,(unsigned long long) ktime_to_ns((ktime_t){.tv64=__entry->now})))

	DECLARE_EVENT_CLASS (hrtimer_class, TP_PROTO(struct hrtimer hrtimer), TP_ARGS(hrtimer), TP_STRUCT__entry(__field(void , hrtimer)), TP_fast_assign(__entry->hrtimer=hrtimer;), TP_printk("hrtimer=%p", __entry->hrtimer))

	DEFINE_EVENT (hrtimer_class, hrtimer_expire_exit, TP_PROTO(struct hrtimer *hrtimer),)

	DEFINE_EVENT (hrtimer_class, hrtimer_cancel, TP_PROTO(struct hrtimer *hrtimer),)

	TRACE_EVENT (itimer_state, TP_PROTO(int which, const struct itimerval *const value, cputime_t expires), TP_ARGS(which, value, expires), TP_STRUCT__entry(__field(int, which) __field(cputime_t, expires) __field(long, value_sec) __field(long, value_usec) __field(long, interval_sec) __field(long, interval_usec)), TP_fast_assign(__entry->which=which;__entry->expires=expires;__entry->value_sec=value->it_value.tv_sec;__entry->value_usec=value->it_value.tv_usec;__entry->interval_sec=value->it_interval.tv_sec;__entry->interval_usec=value->it_interval.tv_usec;), TP_printk("which=%d expires=%llu it_value=%ld.%ld it_interval=%ld.%ld", __entry->which,(unsigned long long) __entry->expires, __entry->value_sec, __entry->value_usec, __entry->interval_sec, __entry->interval_usec))

	TRACE_EVENT (itimer_expire, TP_PROTO(int which, struct pid *pid, cputime_t now), TP_ARGS(which, pid, now), TP_STRUCT__entry(__field(int, which) __field(pid_t, pid) __field(cputime_t, now)), TP_fast_assign(__entry->which=which;__entry->now=now;__entry->pid=pid_nr(pid);), TP_printk("which=%d pid=%d now=%llu", __entry->which,(int) __entry->pid,(unsigned long long) __entry->now))

Macro Definition Documentation

#define _TRACE_TIMER_H

Definition at line 5 of file timer.h.

#define TRACE_SYSTEM timer

Definition at line 2 of file timer.h.

Function Documentation

DECLARE_EVENT_CLASS	(	timer_class	,
		TP_PROTO(struct timer_list *timer)	,
		TP_ARGS(timer)	,
		TP_STRUCT__entry(__field(void *, timer))	,
		TP_fast_assign(__entry->timer=timer;)	,
		TP_printk("timer=%p", __entry->timer)
	)

DECLARE_EVENT_CLASS	(	hrtimer_class	,
		TP_PROTO(struct hrtimer *hrtimer)	,
		TP_ARGS(hrtimer)	,
		TP_STRUCT__entry(__field(void *, hrtimer))	,
		TP_fast_assign(__entry->hrtimer=hrtimer;)	,
		TP_printk("hrtimer=%p", __entry->hrtimer)
	)

DEFINE_EVENT	(	timer_class	,
		timer_init	,
		TP_PROTO(struct timer_list *timer)
	)

timer_init - called when the timer is initialized : pointer to struct timer_list

DEFINE_EVENT	(	timer_class	,
		timer_expire_exit	,
		TP_PROTO(struct timer_list *timer)
	)

timer_expire_exit - called immediately after the timer callback returns : pointer to struct timer_list

When used in combination with the timer_expire_entry tracepoint we can determine the runtime of the timer callback function.

NOTE: Do NOT derefernce timer in TP_fast_assign. The pointer might be invalid. We solely track the pointer.

DEFINE_EVENT	(	timer_class	,
		timer_cancel	,
		TP_PROTO(struct timer_list *timer)
	)

timer_cancel - called when the timer is canceled : pointer to struct timer_list

DEFINE_EVENT	(	hrtimer_class	,
		hrtimer_expire_exit	,
		TP_PROTO(struct hrtimer *hrtimer)
	)

hrtimer_expire_exit - called immediately after the hrtimer callback returns : pointer to struct hrtimer

When used in combination with the hrtimer_expire_entry tracepoint we can determine the runtime of the callback function.

DEFINE_EVENT	(	hrtimer_class	,
		hrtimer_cancel	,
		TP_PROTO(struct hrtimer *hrtimer)
	)

hrtimer_cancel - called when the hrtimer is canceled : pointer to struct hrtimer

TRACE_EVENT	(	timer_start	,
		TP_PROTO(struct timer_list *timer, unsigned long expires)	,
		TP_ARGS(timer, expires)	,
		TP_STRUCT__entry(__field(void , timer) __field(void , function) __field(unsigned long, expires) __field(unsigned long, now))	,
		TP_fast_assign(__entry->timer=timer;__entry->function=timer->function;__entry->expires=expires;__entry->now=jiffies;)	,
		TP_printk("timer=%p function=%pf expires=%lu [timeout=%ld]", __entry->timer, __entry->function, __entry->expires,(long) __entry->expires-__entry->now)
	)

timer_start - called when the timer is started : pointer to struct timer_list : the timers expiry time

TRACE_EVENT	(	timer_expire_entry	,
		TP_PROTO(struct timer_list *timer)	,
		TP_ARGS(timer)	,
		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 function=%pf now=%lu", __entry->timer, __entry->function, __entry->now)
	)

timer_expire_entry - called immediately before the timer callback : pointer to struct timer_list

Allows to determine the timer latency.

TRACE_EVENT	(	hrtimer_init	,
		TP_PROTO(struct hrtimer *hrtimer, clockid_t clockid, enum hrtimer_mode mode)	,
		TP_ARGS(hrtimer, clockid, mode)	,
		TP_STRUCT__entry(__field(void *, hrtimer) __field(clockid_t, clockid) __field(enum hrtimer_mode, mode))	,
		TP_fast_assign(__entry->hrtimer=hrtimer;__entry->clockid=clockid;__entry->mode=mode;)	,
		TP_printk("hrtimer=%p clockid=%s mode=%s", __entry->hrtimer, __entry->clockid==CLOCK_REALTIME?"CLOCK_REALTIME":"CLOCK_MONOTONIC", __entry->mode==HRTIMER_MODE_ABS?"HRTIMER_MODE_ABS":"HRTIMER_MODE_REL")
	)

hrtimer_init - called when the hrtimer is initialized : pointer to struct hrtimer : the hrtimers clock : the hrtimers mode

TRACE_EVENT	(	hrtimer_start	,
		TP_PROTO(struct hrtimer *hrtimer)	,
		TP_ARGS(hrtimer)	,
		TP_STRUCT__entry(__field(void , hrtimer) __field(void , function) __field(s64, expires) __field(s64, softexpires))	,
		TP_fast_assign(__entry->hrtimer=hrtimer;__entry->function=hrtimer->function;__entry->expires=hrtimer_get_expires(hrtimer).tv64;__entry->softexpires=hrtimer_get_softexpires(hrtimer).tv64;)	,
		TP_printk("hrtimer=%p function=%pf expires=%llu softexpires=%llu", __entry->hrtimer, __entry->function,(unsigned long long) ktime_to_ns((ktime_t){.tv64=__entry->expires}),(unsigned long long) ktime_to_ns((ktime_t){.tv64=__entry->softexpires}))
	)

hrtimer_start - called when the hrtimer is started : pointer to struct hrtimer

TRACE_EVENT	(	hrtimer_expire_entry	,
		TP_PROTO(struct hrtimer hrtimer, ktime_t now)	,
		TP_ARGS(hrtimer, now)	,
		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 function=%pf now=%llu", __entry->hrtimer, __entry->function,(unsigned long long) ktime_to_ns((ktime_t){.tv64=__entry->now}))
	)

htimmer_expire_entry - called immediately before the hrtimer callback : pointer to struct hrtimer : pointer to variable which contains current time of the timers base.

Allows to determine the timer latency.

TRACE_EVENT	(	itimer_state	,
		TP_PROTO(int which, const struct itimerval *const value, cputime_t expires)	,
		TP_ARGS(which, value, expires)	,
		TP_STRUCT__entry(__field(int, which) __field(cputime_t, expires) __field(long, value_sec) __field(long, value_usec) __field(long, interval_sec) __field(long, interval_usec))	,
		TP_fast_assign(__entry->which=which;__entry->expires=expires;__entry->value_sec=value->it_value.tv_sec;__entry->value_usec=value->it_value.tv_usec;__entry->interval_sec=value->it_interval.tv_sec;__entry->interval_usec=value->it_interval.tv_usec;)	,
		TP_printk("which=%d expires=%llu it_value=%ld.%ld it_interval=%ld.%ld", __entry->which,(unsigned long long) __entry->expires, __entry->value_sec, __entry->value_usec, __entry->interval_sec, __entry->interval_usec)
	)

itimer_state - called when itimer is started or canceled : name of the interval timer : the itimers value, itimer is canceled if value->it_value is zero, otherwise it is started : the itimers expiry time

TRACE_EVENT	(	itimer_expire	,
		TP_PROTO(int which, struct pid *pid, cputime_t now)	,
		TP_ARGS(which, pid, now)	,
		TP_STRUCT__entry(__field(int, which) __field(pid_t, pid) __field(cputime_t, now))	,
		TP_fast_assign(__entry->which=which;__entry->now=now;__entry->pid=pid_nr(pid);)	,
		TP_printk("which=%d pid=%d now=%llu", __entry->which,(int) __entry->pid,(unsigned long long) __entry->now)
	)

itimer_expire - called when itimer expires : type of the interval timer : pid of the process which owns the timer : current time, used to calculate the latency of itimer

Macros

Functions

Macro Definition Documentation

Function Documentation