linux-kernel - Re: [RFC V2 17/21] watchdog/dev: Add tracepoints

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Message-ID: <b59155c2-81c1-b2d8-c8d9-a97e3166cee3@roeck-us.net>
Date:   Thu, 17 Feb 2022 10:17:40 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Gabriele Paoloni <gpaoloni@...hat.com>,
        Daniel Bristot de Oliveira <bristot@...nel.org>,
        "Peter.Enderborg@...y.com" <Peter.Enderborg@...y.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>
Cc:     Jonathan Corbet <corbet@....net>, Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Marco Elver <elver@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Clark Williams <williams@...hat.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-trace-devel@...r.kernel.org" 
        <linux-trace-devel@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [RFC V2 17/21] watchdog/dev: Add tracepoints

On 2/17/22 09:49, Gabriele Paoloni wrote:
> 
> 
> On 17/02/2022 18:27, Guenter Roeck wrote:
>> On 2/17/22 08:27, Daniel Bristot de Oliveira wrote:
>>> Hi Peter
>>>
>>> On 2/16/22 17:01, Peter.Enderborg@...y.com wrote:
>>>> On 2/14/22 11:45, Daniel Bristot de Oliveira wrote:
>>>>> Add a set of tracepoints, enabling the observability of the watchdog
>>>>> device interactions with user-space.
>>>>>
>>>>> The events are:
>>>>>      watchdog:watchdog_open
>>>>>      watchdog:watchdog_close
>>>>>      watchdog:watchdog_start
>>>>>      watchdog:watchdog_stop
>>>>>      watchdog:watchdog_set_timeout
>>>>>      watchdog:watchdog_ping
>>>>>      watchdog:watchdog_nowayout
>>>>>      watchdog:watchdog_set_keep_alive
>>>>>      watchdog:watchdog_keep_alive
>>>>
>>>> Some watchdogs have a bark functionality, I think it should be event
>>>> for that too.
>>>>
>>>
>>> I understand. The problems is that I do not see the bark abstraction
>>> in the
>>> watchdog_dev layer.
>>>
>>
>> I don't even know what "bark functionality" means. A new term for
>> pretimeout ?
>> Something else ?
> 
>>>From my understanding the bark timeout is actually the pretimeout
> whereas the bite timeout is the actual timeout.
> I think in the Kernel ftwdt010_wdt and qcom-wdt are bark/bite WTDs
> 

If that is the case, I would prefer if we could stick to existing
terminology to avoid issues like "I do not see the bark abstraction".

Thanks,
Guenter