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SubjectRe: [PATCH v3] rtc: Add tracepoints for RTC system
On 14/12/2017 at 13:31:43 +0800, Baolin Wang wrote:
> It will be more helpful to add some tracepoints to track RTC actions when
> debugging RTC driver. Below sample is that we set/read the RTC time, then
> set 2 alarms, so we can see the trace logs:
>
> set/read RTC time:
> kworker/0:1-67 [000] 21.814245: rtc_set_time: UTC (1510301580) (0)
> kworker/0:1-67 [000] 21.814312: rtc_read_time: UTC (1510301580) (0)
>
> set the first alarm timer:
> kworker/0:1-67 [000] 21.829238: rtc_timer_enqueue: RTC timer:(ffffffc15eb49bc8) expires:1510301700000000000 period:0
> kworker/0:1-67 [000] 22.018279: rtc_set_alarm: UTC (1510301700) (0)
>
> set the second alarm timer:
> kworker/0:1-67 [000] 22.230284: rtc_timer_enqueue: RTC timer:(ffffff80088e6430) expires:1510301820000000000 period:0
>
> the first alarm timer was expired:
> kworker/0:1-67 [000] 145.155584: rtc_timer_dequeue: RTC timer:(ffffffc15eb49bc8) expires:1510301700000000000 period:0
> kworker/0:1-67 [000] 145.155593: rtc_timer_fired: RTC timer:(ffffffc15eb49bc8) expires:1510301700000000000 period:0
> kworker/0:1-67 [000] 145.172504: rtc_set_alarm: UTC (1510301820) (0)
>
> the second alarm timer was expired:
> kworker/0:1-67 [000] 269.102353: rtc_timer_dequeue: RTC timer:(ffffff80088e6430) expires:1510301820000000000 period:0
> kworker/0:1-67 [000] 269.102360: rtc_timer_fired: RTC timer:(ffffff80088e6430) expires:1510301820000000000 period:0
>
> disable alarm irq:
> kworker/0:1-67 [000] 269.102469: rtc_alarm_irq_enable: disable RTC alarm IRQ (0)
>
> Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
> ---
> Changes since v2:
> - Only keep time64_t in the buffer.
>
> Changes since v1:
> - Use unconditional tracepoints with tracing the failures.
> - Simplify the rtc_timer_class.
> ---
> drivers/rtc/interface.c | 30 +++++++
> include/trace/events/rtc.h | 206 ++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 236 insertions(+)
> create mode 100644 include/trace/events/rtc.h
>
Applied, thanks.

--
Alexandre Belloni, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
http://bootlin.com

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