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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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ede1b42907
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>
329 lines
7.4 KiB
C
329 lines
7.4 KiB
C
#undef TRACE_SYSTEM
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#define TRACE_SYSTEM timer
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#if !defined(_TRACE_TIMER_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_TIMER_H
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#include <linux/tracepoint.h>
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#include <linux/hrtimer.h>
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#include <linux/timer.h>
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DECLARE_EVENT_CLASS(timer_class,
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TP_PROTO(struct timer_list *timer),
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TP_ARGS(timer),
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TP_STRUCT__entry(
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__field( void *, timer )
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),
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TP_fast_assign(
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__entry->timer = timer;
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),
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TP_printk("timer=%p", __entry->timer)
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);
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/**
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* timer_init - called when the timer is initialized
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* @timer: pointer to struct timer_list
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*/
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DEFINE_EVENT(timer_class, timer_init,
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TP_PROTO(struct timer_list *timer),
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TP_ARGS(timer)
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);
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/**
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* timer_start - called when the timer is started
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* @timer: pointer to struct timer_list
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* @expires: the timers expiry time
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*/
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TRACE_EVENT(timer_start,
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TP_PROTO(struct timer_list *timer, unsigned long expires),
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TP_ARGS(timer, expires),
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TP_STRUCT__entry(
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__field( void *, timer )
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__field( void *, function )
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__field( unsigned long, expires )
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__field( unsigned long, now )
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),
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TP_fast_assign(
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__entry->timer = timer;
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__entry->function = timer->function;
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__entry->expires = expires;
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__entry->now = jiffies;
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),
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TP_printk("timer=%p function=%pf expires=%lu [timeout=%ld]",
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__entry->timer, __entry->function, __entry->expires,
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(long)__entry->expires - __entry->now)
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);
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/**
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* timer_expire_entry - called immediately before the timer callback
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* @timer: pointer to struct timer_list
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*
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* Allows to determine the timer latency.
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*/
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TRACE_EVENT(timer_expire_entry,
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TP_PROTO(struct timer_list *timer),
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TP_ARGS(timer),
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TP_STRUCT__entry(
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__field( void *, timer )
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__field( unsigned long, now )
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__field( void *, function)
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),
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TP_fast_assign(
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__entry->timer = timer;
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__entry->now = jiffies;
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__entry->function = timer->function;
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),
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TP_printk("timer=%p function=%pf now=%lu", __entry->timer, __entry->function,__entry->now)
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);
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/**
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* timer_expire_exit - called immediately after the timer callback returns
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* @timer: pointer to struct timer_list
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*
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* When used in combination with the timer_expire_entry tracepoint we can
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* determine the runtime of the timer callback function.
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*
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* NOTE: Do NOT derefernce timer in TP_fast_assign. The pointer might
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* be invalid. We solely track the pointer.
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*/
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DEFINE_EVENT(timer_class, timer_expire_exit,
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TP_PROTO(struct timer_list *timer),
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TP_ARGS(timer)
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);
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/**
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* timer_cancel - called when the timer is canceled
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* @timer: pointer to struct timer_list
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*/
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DEFINE_EVENT(timer_class, timer_cancel,
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TP_PROTO(struct timer_list *timer),
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TP_ARGS(timer)
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);
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/**
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* hrtimer_init - called when the hrtimer is initialized
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* @timer: pointer to struct hrtimer
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* @clockid: the hrtimers clock
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* @mode: the hrtimers mode
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*/
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TRACE_EVENT(hrtimer_init,
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TP_PROTO(struct hrtimer *hrtimer, clockid_t clockid,
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enum hrtimer_mode mode),
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TP_ARGS(hrtimer, clockid, mode),
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TP_STRUCT__entry(
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__field( void *, hrtimer )
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__field( clockid_t, clockid )
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__field( enum hrtimer_mode, mode )
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),
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TP_fast_assign(
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__entry->hrtimer = hrtimer;
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__entry->clockid = clockid;
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__entry->mode = mode;
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),
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TP_printk("hrtimer=%p clockid=%s mode=%s", __entry->hrtimer,
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__entry->clockid == CLOCK_REALTIME ?
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"CLOCK_REALTIME" : "CLOCK_MONOTONIC",
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__entry->mode == HRTIMER_MODE_ABS ?
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"HRTIMER_MODE_ABS" : "HRTIMER_MODE_REL")
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);
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/**
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* hrtimer_start - called when the hrtimer is started
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* @timer: pointer to struct hrtimer
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*/
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TRACE_EVENT(hrtimer_start,
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TP_PROTO(struct hrtimer *hrtimer),
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TP_ARGS(hrtimer),
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TP_STRUCT__entry(
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__field( void *, hrtimer )
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__field( void *, function )
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__field( s64, expires )
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__field( s64, softexpires )
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),
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TP_fast_assign(
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__entry->hrtimer = hrtimer;
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__entry->function = hrtimer->function;
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__entry->expires = hrtimer_get_expires(hrtimer).tv64;
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__entry->softexpires = hrtimer_get_softexpires(hrtimer).tv64;
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),
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TP_printk("hrtimer=%p function=%pf expires=%llu softexpires=%llu",
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__entry->hrtimer, __entry->function,
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(unsigned long long)ktime_to_ns((ktime_t) {
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.tv64 = __entry->expires }),
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(unsigned long long)ktime_to_ns((ktime_t) {
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.tv64 = __entry->softexpires }))
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);
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/**
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* htimmer_expire_entry - called immediately before the hrtimer callback
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* @timer: pointer to struct hrtimer
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* @now: pointer to variable which contains current time of the
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* timers base.
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*
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* Allows to determine the timer latency.
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*/
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TRACE_EVENT(hrtimer_expire_entry,
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TP_PROTO(struct hrtimer *hrtimer, ktime_t *now),
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TP_ARGS(hrtimer, now),
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TP_STRUCT__entry(
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__field( void *, hrtimer )
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__field( s64, now )
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__field( void *, function)
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),
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TP_fast_assign(
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__entry->hrtimer = hrtimer;
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__entry->now = now->tv64;
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__entry->function = hrtimer->function;
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),
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TP_printk("hrtimer=%p function=%pf now=%llu", __entry->hrtimer, __entry->function,
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(unsigned long long)ktime_to_ns((ktime_t) { .tv64 = __entry->now }))
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);
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DECLARE_EVENT_CLASS(hrtimer_class,
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TP_PROTO(struct hrtimer *hrtimer),
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TP_ARGS(hrtimer),
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TP_STRUCT__entry(
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__field( void *, hrtimer )
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),
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TP_fast_assign(
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__entry->hrtimer = hrtimer;
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),
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TP_printk("hrtimer=%p", __entry->hrtimer)
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);
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/**
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* hrtimer_expire_exit - called immediately after the hrtimer callback returns
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* @timer: pointer to struct hrtimer
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*
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* When used in combination with the hrtimer_expire_entry tracepoint we can
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* determine the runtime of the callback function.
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*/
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DEFINE_EVENT(hrtimer_class, hrtimer_expire_exit,
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TP_PROTO(struct hrtimer *hrtimer),
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TP_ARGS(hrtimer)
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);
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/**
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* hrtimer_cancel - called when the hrtimer is canceled
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* @hrtimer: pointer to struct hrtimer
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*/
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DEFINE_EVENT(hrtimer_class, hrtimer_cancel,
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TP_PROTO(struct hrtimer *hrtimer),
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TP_ARGS(hrtimer)
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);
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/**
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* itimer_state - called when itimer is started or canceled
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* @which: name of the interval timer
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* @value: the itimers value, itimer is canceled if value->it_value is
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* zero, otherwise it is started
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* @expires: the itimers expiry time
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*/
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TRACE_EVENT(itimer_state,
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TP_PROTO(int which, const struct itimerval *const value,
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cputime_t expires),
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TP_ARGS(which, value, expires),
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TP_STRUCT__entry(
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__field( int, which )
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__field( cputime_t, expires )
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__field( long, value_sec )
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__field( long, value_usec )
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__field( long, interval_sec )
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__field( long, interval_usec )
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),
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TP_fast_assign(
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__entry->which = which;
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__entry->expires = expires;
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__entry->value_sec = value->it_value.tv_sec;
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__entry->value_usec = value->it_value.tv_usec;
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__entry->interval_sec = value->it_interval.tv_sec;
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__entry->interval_usec = value->it_interval.tv_usec;
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),
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TP_printk("which=%d expires=%llu it_value=%ld.%ld it_interval=%ld.%ld",
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__entry->which, (unsigned long long)__entry->expires,
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__entry->value_sec, __entry->value_usec,
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__entry->interval_sec, __entry->interval_usec)
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);
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/**
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* itimer_expire - called when itimer expires
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* @which: type of the interval timer
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* @pid: pid of the process which owns the timer
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* @now: current time, used to calculate the latency of itimer
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*/
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TRACE_EVENT(itimer_expire,
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TP_PROTO(int which, struct pid *pid, cputime_t now),
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TP_ARGS(which, pid, now),
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TP_STRUCT__entry(
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__field( int , which )
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__field( pid_t, pid )
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__field( cputime_t, now )
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),
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TP_fast_assign(
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__entry->which = which;
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__entry->now = now;
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__entry->pid = pid_nr(pid);
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),
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TP_printk("which=%d pid=%d now=%llu", __entry->which,
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(int) __entry->pid, (unsigned long long)__entry->now)
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);
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#endif /* _TRACE_TIMER_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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