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Date: Thu, 18 Aug 2016 10:33:32 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Baolin Wang <baolin.wang@...aro.org>
Cc: mingo@...hat.com, john.stultz@...aro.org, tglx@...utronix.de,
broonie@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] time: alarmtimer: Add the trcepoints for alarmtimer
On Thu, 18 Aug 2016 16:47:39 +0800
Baolin Wang <baolin.wang@...aro.org> wrote:
since v1:
> - Fix the kbuild error.
> - Modify the changelog with adding trace log.
> ---
> include/trace/events/alarmtimer.h | 134 +++++++++++++++++++++++++++++++++++++
> kernel/time/alarmtimer.c | 21 +++++-
> 2 files changed, 152 insertions(+), 3 deletions(-)
> create mode 100644 include/trace/events/alarmtimer.h
>
> diff --git a/include/trace/events/alarmtimer.h b/include/trace/events/alarmtimer.h
> new file mode 100644
> index 0000000..eea4e12
> --- /dev/null
> +++ b/include/trace/events/alarmtimer.h
> @@ -0,0 +1,134 @@
> +#undef TRACE_SYSTEM
> +#define TRACE_SYSTEM alarmtimer
> +
> +#if !defined(_TRACE_ALARMTIMER_H) || defined(TRACE_HEADER_MULTI_READ)
> +#define _TRACE_ALARMTIMER_H
> +
> +#include <linux/alarmtimer.h>
> +#include <linux/rtc.h>
> +#include <linux/tracepoint.h>
> +
> +#define show_alarm_type(type) __print_flags(type, " | ", \
> + { 1 << ALARM_REALTIME, "ALARM_REALTIME" }, \
> + { 1 << ALARM_BOOTTIME, "ALARM_BOOTTIME" })
As ALARM_REALTIME and ALARM_BOOTTIME are both enums, they will not be
converted for userspace. Can you add the following:
TRACE_DEFINE_ENUM(ALARM_REALTIME);
TRACE_DEFINE_ENUM(ALARM_BOOTTIME);
> +
> +DECLARE_EVENT_CLASS(alarm_setting,
> +
> + TP_PROTO(struct rtc_time *rtc_time, int flag),
> +
> + TP_ARGS(rtc_time, flag),
> +
> + TP_STRUCT__entry(
> + __field(unsigned int, second)
> + __field(unsigned int, minute)
> + __field(unsigned int, hour)
> + __field(unsigned int, day)
> + __field(unsigned int, mon)
> + __field(unsigned int, year)
> + __field(unsigned int, alarm_type)
To save space in the ring buffer, perhaps we can make the above not
take up so much space:
unsigned char, second
unsigned char, minute
unsigned char, hour
unsigned char, day
unsigned char, mon
unsigned char, alarm_type
unsigned short, year
Why use 32 bits when most of the values fit nicely in one byte, and no
more than a 16 bytes. Also, order doesn't really matter for output, but
works well for compacting, as the above is only 8 bytes total.
> + ),
> +
> + TP_fast_assign(
> + __entry->second = rtc_time->tm_sec;
> + __entry->minute = rtc_time->tm_min;
> + __entry->hour = rtc_time->tm_hour;
> + __entry->day = rtc_time->tm_mday;
> + __entry->mon = rtc_time->tm_mon;
> + __entry->year = rtc_time->tm_year;
> + __entry->alarm_type = flag;
> + ),
> +
> + TP_printk("alarmtimer type:%s expires time: %u-%u-%u %u:%u:%u",
> + show_alarm_type((1 << __entry->alarm_type)),
> + __entry->year + 1900,
> + __entry->mon + 1,
> + __entry->day,
> + __entry->hour,
> + __entry->minute,
> + __entry->second
> + )
> +);
> +
> +DEFINE_EVENT(alarm_setting, alarmtimer_suspend,
> +
> + TP_PROTO(struct rtc_time *time, int flag),
> +
> + TP_ARGS(time, flag)
> +);
> +
> +DECLARE_EVENT_CLASS(alarm_processing,
> +
> + TP_PROTO(struct alarm *alarm, char *process_name),
> +
> + TP_ARGS(alarm, process_name),
> +
> + TP_STRUCT__entry(
> + __field(unsigned long long, expires)
> + __field(unsigned int, second)
> + __field(unsigned int, minute)
> + __field(unsigned int, hour)
> + __field(unsigned int, day)
> + __field(unsigned int, mon)
> + __field(unsigned int, year)
> + __field(unsigned int, alarm_type)
Same here.
> + __string(name, process_name)
> + ),
> +
> + TP_fast_assign(
> + __entry->expires = alarm->node.expires.tv64;
> + __entry->second = rtc_ktime_to_tm(alarm->node.expires).tm_sec;
> + __entry->minute = rtc_ktime_to_tm(alarm->node.expires).tm_min;
> + __entry->hour = rtc_ktime_to_tm(alarm->node.expires).tm_hour;
> + __entry->day = rtc_ktime_to_tm(alarm->node.expires).tm_mday;
> + __entry->mon = rtc_ktime_to_tm(alarm->node.expires).tm_mon;
> + __entry->year = rtc_ktime_to_tm(alarm->node.expires).tm_year;
> + __entry->alarm_type = alarm->type;
> + __assign_str(name, process_name);
> + ),
> +
> + TP_printk("process:%s alarmtimer type:%s expires:%llu "
> + "time: %u-%u-%u %u:%u:%u",
> + __get_str(name),
> + show_alarm_type((1 << __entry->alarm_type)),
> + __entry->expires,
> + __entry->year + 1900,
> + __entry->mon + 1,
> + __entry->day,
> + __entry->hour,
> + __entry->minute,
> + __entry->second
> + )
> +);
> +
> +DEFINE_EVENT(alarm_processing, alarmtimer_fired,
> +
> + TP_PROTO(struct alarm *alarm, char *process_name),
> +
> + TP_ARGS(alarm, process_name)
> +);
> +
> +DEFINE_EVENT(alarm_processing, alarmtimer_start,
> +
> + TP_PROTO(struct alarm *alarm, char *process_name),
> +
> + TP_ARGS(alarm, process_name)
> +);
> +
> +DEFINE_EVENT(alarm_processing, alarmtimer_restart,
> +
> + TP_PROTO(struct alarm *alarm, char *process_name),
> +
> + TP_ARGS(alarm, process_name)
> +);
> +
> +DEFINE_EVENT(alarm_processing, alarmtimer_cancel,
> +
> + TP_PROTO(struct alarm *alarm, char *process_name),
> +
> + TP_ARGS(alarm, process_name)
> +);
> +
> +#endif /* _TRACE_ALARMTIMER_H */
> +
> +/* This part must be outside protection */
> +#include <trace/define_trace.h>
> diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
> index c3aad68..866d668 100644
> --- a/kernel/time/alarmtimer.c
> +++ b/kernel/time/alarmtimer.c
> @@ -26,6 +26,9 @@
> #include <linux/workqueue.h>
> #include <linux/freezer.h>
>
> +#define CREATE_TRACE_POINTS
> +#include <trace/events/alarmtimer.h>
> +
> /**
> * struct alarm_base - Alarm timer bases
> * @lock: Lock for syncrhonized access to the base
> @@ -194,6 +197,7 @@ static enum hrtimer_restart alarmtimer_fired(struct hrtimer *timer)
> }
> spin_unlock_irqrestore(&base->lock, flags);
>
> + trace_alarmtimer_fired(alarm, NULL);
> return ret;
>
> }
> @@ -218,11 +222,11 @@ EXPORT_SYMBOL_GPL(alarm_expires_remaining);
> */
> static int alarmtimer_suspend(struct device *dev)
> {
> - struct rtc_time tm;
> + struct rtc_time tm, tm_set;
> ktime_t min, now;
> unsigned long flags;
> struct rtc_device *rtc;
> - int i;
> + int i, type = 0;
> int ret;
>
> spin_lock_irqsave(&freezer_delta_lock, flags);
> @@ -247,8 +251,10 @@ static int alarmtimer_suspend(struct device *dev)
> if (!next)
> continue;
> delta = ktime_sub(next->expires, base->gettime());
> - if (!min.tv64 || (delta.tv64 < min.tv64))
> + if (!min.tv64 || (delta.tv64 < min.tv64)) {
> min = delta;
> + type = i;
> + }
> }
> if (min.tv64 == 0)
> return 0;
> @@ -264,6 +270,9 @@ static int alarmtimer_suspend(struct device *dev)
> now = rtc_tm_to_ktime(tm);
> now = ktime_add(now, min);
>
> + tm_set = rtc_ktime_to_tm(now);
> + trace_alarmtimer_suspend(&tm_set, type);
To keep from having to call rtc_ktime_to_tm(now) when not tracing, add:
if (trace_alarmtimer_suspend_enabled()) {
tm_set = rtc_ktime_to_tm(now);
trace_alarmtimer_suspend(&tm_set, type);
}
As trace_alarmtimer_suspend_enabled() is a static key and not a cmp
branch. That is, it's dynamically enabled or disabled and is always a
static branch.
-- Steve
> +
> /* Set alarm, if in the past reject suspend briefly to handle */
> ret = rtc_timer_start(rtc, &rtctimer, now, ktime_set(0, 0));
> if (ret < 0)
> @@ -342,6 +351,8 @@ void alarm_start(struct alarm *alarm, ktime_t start)
> alarmtimer_enqueue(base, alarm);
> hrtimer_start(&alarm->timer, alarm->node.expires, HRTIMER_MODE_ABS);
> spin_unlock_irqrestore(&base->lock, flags);
> +
> + trace_alarmtimer_start(alarm, current->comm);
> }
> EXPORT_SYMBOL_GPL(alarm_start);
>
> @@ -369,6 +380,8 @@ void alarm_restart(struct alarm *alarm)
> hrtimer_restart(&alarm->timer);
> alarmtimer_enqueue(base, alarm);
> spin_unlock_irqrestore(&base->lock, flags);
> +
> + trace_alarmtimer_restart(alarm, current->comm);
> }
> EXPORT_SYMBOL_GPL(alarm_restart);
>
> @@ -390,6 +403,8 @@ int alarm_try_to_cancel(struct alarm *alarm)
> if (ret >= 0)
> alarmtimer_dequeue(base, alarm);
> spin_unlock_irqrestore(&base->lock, flags);
> +
> + trace_alarmtimer_cancel(alarm, current->comm);
> return ret;
> }
> EXPORT_SYMBOL_GPL(alarm_try_to_cancel);
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