linux-kernel - Re: [PATCH v2] rtc: Add tracepoints for RTC system

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Date:   Thu, 30 Nov 2017 10:56:22 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     linux-rtc@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>, Mark Brown <broonie@...nel.org>,
        Baolin Wang <baolin.wang@...aro.org>
Subject: Re: [PATCH v2] rtc: Add tracepoints for RTC system

Hi Alexandre and Ingo,

On 16 November 2017 at 13:59, Baolin Wang <baolin.wang@...aro.org> 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: 2017-11-10 08:13:00 UTC (1510301580) (0)
> kworker/0:1-67 [000] 21.814312: rtc_read_time: 2017-11-10 08:13:00 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: 2017-11-10 08:15:00 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: 2017-11-10 08:17:00 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@...aro.org>
> ---
> Changes since v1:
>  - Use unconditional tracepoints with tracing the failures.
>  - Simplify the rtc_timer_class.
> ---

Do you have any comments for this patch? Thanks.

-- 
Baolin Wang
Best Regards