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Sender: Guenter Roeck <groeck7@gmail.com>
Message-ID: <ef1b1d99-6172-2b4d-9612-7ecbe8fc6c8b@roeck-us.net>
Date:   Thu, 17 Feb 2022 09:27:11 -0800
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Subject: Re: [RFC V2 17/21] watchdog/dev: Add tracepoints
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To:     Daniel Bristot de Oliveira <bristot@kernel.org>,
        "Peter.Enderborg@sony.com" <Peter.Enderborg@sony.com>,
        Wim Van Sebroeck <wim@linux-watchdog.org>
Cc:     Jonathan Corbet <corbet@lwn.net>, Ingo Molnar <mingo@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Will Deacon <will@kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Marco Elver <elver@google.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        "Paul E. McKenney" <paulmck@kernel.org>,
        Shuah Khan <skhan@linuxfoundation.org>,
        Gabriele Paoloni <gpaoloni@redhat.com>,
        Juri Lelli <juri.lelli@redhat.com>,
        Clark Williams <williams@redhat.com>,
        "linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-trace-devel@vger.kernel.org" 
        <linux-trace-devel@vger.kernel.org>,
        Steven Rostedt <rostedt@goodmis.org>
References: <cover.1644830251.git.bristot@kernel.org>
 <e67874c8b676ea8dfe38679efa25363889bb1e76.1644830251.git.bristot@kernel.org>
 <96f418b4-0ba8-01fe-ead0-2028bfc42560@sony.com>
 <ba924008-c0ab-4800-aac4-d9d9ae930c32@kernel.org>
From:   Guenter Roeck <linux@roeck-us.net>
In-Reply-To: <ba924008-c0ab-4800-aac4-d9d9ae930c32@kernel.org>
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On 2/17/22 08:27, Daniel Bristot de Oliveira wrote:
> Hi Peter
> 
> On 2/16/22 17:01, Peter.Enderborg@sony.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 ?

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