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Alarm timers are one of the mechanisms to wake up a system from suspend, but there exist no tracepoints to analyse which process/thread armed an alarmtimer. Add tracepoints for start/cancel/expire of individual alarm timers and one for tracing the suspend time decision when to resume the system. The following trace excerpt illustrates the new mechanism: Binder:3292_2-3304 [000] d..2 149.981123: alarmtimer_cancel: alarmtimer:ffffffc1319a7800 type:REALTIME expires:1325463120000000000 now:1325376810370370245 Binder:3292_2-3304 [000] d..2 149.981136: alarmtimer_start: alarmtimer:ffffffc1319a7800 type:REALTIME expires:1325376840000000000 now:1325376810370384591 Binder:3292_9-3953 [000] d..2 150.212991: alarmtimer_cancel: alarmtimer:ffffffc1319a5a00 type:BOOTTIME expires:179552000000 now:150154008122 Binder:3292_9-3953 [000] d..2 150.213006: alarmtimer_start: alarmtimer:ffffffc1319a5a00 type:BOOTTIME expires:179551000000 now:150154025622 system_server-3000 [002] ...1 162.701940: alarmtimer_suspend: alarmtimer type:REALTIME expires:1325376840000000000 The wakeup time which is selected at suspend time allows to map it back to the task arming the timer: Binder:3292_2. [ tglx: Store alarm timer expiry time instead of some useless RTC relative information, add proper type information for wakeups which are handled via the clock_nanosleep/freezer and massage the changelog. ] Signed-off-by: Baolin Wang <baolin.wang@linaro.org> Signed-off-by: John Stultz <john.stultz@linaro.org> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Prarit Bhargava <prarit@redhat.com> Cc: Richard Cochran <richardcochran@gmail.com> Link: http://lkml.kernel.org/r/1480372524-15181-5-git-send-email-john.stultz@linaro.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
97 lines
2.0 KiB
C
97 lines
2.0 KiB
C
#undef TRACE_SYSTEM
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#define TRACE_SYSTEM alarmtimer
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#if !defined(_TRACE_ALARMTIMER_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_ALARMTIMER_H
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#include <linux/alarmtimer.h>
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#include <linux/rtc.h>
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#include <linux/tracepoint.h>
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TRACE_DEFINE_ENUM(ALARM_REALTIME);
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TRACE_DEFINE_ENUM(ALARM_BOOTTIME);
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TRACE_DEFINE_ENUM(ALARM_REALTIME_FREEZER);
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TRACE_DEFINE_ENUM(ALARM_BOOTTIME_FREEZER);
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#define show_alarm_type(type) __print_flags(type, " | ", \
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{ 1 << ALARM_REALTIME, "REALTIME" }, \
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{ 1 << ALARM_BOOTTIME, "BOOTTIME" }, \
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{ 1 << ALARM_REALTIME_FREEZER, "REALTIME Freezer" }, \
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{ 1 << ALARM_BOOTTIME_FREEZER, "BOOTTIME Freezer" })
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TRACE_EVENT(alarmtimer_suspend,
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TP_PROTO(ktime_t expires, int flag),
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TP_ARGS(expires, flag),
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TP_STRUCT__entry(
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__field(s64, expires)
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__field(unsigned char, alarm_type)
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),
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TP_fast_assign(
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__entry->expires = expires.tv64;
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__entry->alarm_type = flag;
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),
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TP_printk("alarmtimer type:%s expires:%llu",
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show_alarm_type((1 << __entry->alarm_type)),
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__entry->expires
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)
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);
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DECLARE_EVENT_CLASS(alarm_class,
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TP_PROTO(struct alarm *alarm, ktime_t now),
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TP_ARGS(alarm, now),
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TP_STRUCT__entry(
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__field(void *, alarm)
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__field(unsigned char, alarm_type)
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__field(s64, expires)
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__field(s64, now)
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),
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TP_fast_assign(
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__entry->alarm = alarm;
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__entry->alarm_type = alarm->type;
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__entry->expires = alarm->node.expires.tv64;
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__entry->now = now.tv64;
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),
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TP_printk("alarmtimer:%p type:%s expires:%llu now:%llu",
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__entry->alarm,
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show_alarm_type((1 << __entry->alarm_type)),
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__entry->expires,
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__entry->now
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)
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);
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DEFINE_EVENT(alarm_class, alarmtimer_fired,
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TP_PROTO(struct alarm *alarm, ktime_t now),
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TP_ARGS(alarm, now)
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);
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DEFINE_EVENT(alarm_class, alarmtimer_start,
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TP_PROTO(struct alarm *alarm, ktime_t now),
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TP_ARGS(alarm, now)
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);
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DEFINE_EVENT(alarm_class, alarmtimer_cancel,
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TP_PROTO(struct alarm *alarm, ktime_t now),
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TP_ARGS(alarm, now)
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);
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#endif /* _TRACE_ALARMTIMER_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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