linux-kernel - Re: [PATCH v4] time: alarmtimer: Add the trcepoints for alarmtimer

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Date:   Thu, 27 Oct 2016 15:32:09 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Baolin Wang <baolin.wang@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] time: alarmtimer: Add the trcepoints for alarmtimer

Hi,

On 18 October 2016 at 14:47, Baolin Wang <baolin.wang@...aro.org> wrote:
> For system debugging, we sometimes want to know who sets one
> alarm timer, the time of the timer, when the timer started and
> fired and so on. Thus adding tracepoints can help us trace the
> alarmtimer information.
>
> For example, when we debug the system supend/resume, if the
> system is always resumed by RTC alarm, we can find out which
> process set the alarm timer to resume system by below trace log:
>
> ......
>
> 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:1325376839802714584
>
> ......
>
> From the trace log, we can find out the 'Binder:3292_2' process
> set one alarm timer which resumes the system.
>
> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> Acked-by: Steven Rostedt <rostedt@...dmis.org>
> ---
> Changes since v3:
>  - Remove the "ALARM_" prefix in the string.
>  - Add the ACK by Steven Rostedt.
>
> Changes since v2:
>  - Save time as s64 type.
>  - Remove 'process_name' parameter and add 'now' parameter.
>  - Rename the trace event name.
>  - Remove restart trace event.
>  - Other optimization.

Any comments about this version? Thanks.

-- 
Baolin.wang
Best Regards