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

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Date:   Thu, 17 Feb 2022 18:49:00 +0100
From:   Gabriele Paoloni <gpaoloni@...hat.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        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 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

Gab


> 
> Guenter
> 
>> In the case I am investigating (the safety_monitor/safety_app) the
>> bark is
>> outside of the "OS" view, it is an hardware action - like. shutdown.
>>
>> Am I missing something? Thoughts?
>>
>> -- Daniel
>