linux-kernel - Re: [PATCH v2] watchdog: Add tracing events for the most usual watchdog events

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Date:   Tue, 4 Oct 2022 18:51:46 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>, kernel@...gutronix.de,
        Ingo Molnar <mingo@...hat.com>, linux-watchdog@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] watchdog: Add tracing events for the most usual
 watchdog events

On Tue,  4 Oct 2022 11:19:49 +0200
Uwe Kleine-König <u.kleine-koenig@...gutronix.de> wrote:

> +DEFINE_EVENT(watchdog_template, watchdog_start,
> +	TP_PROTO(struct watchdog_device *wdd, int err),
> +	TP_ARGS(wdd, err));
> +
> +TRACE_EVENT(watchdog_set_timeout,
> +
> +	TP_PROTO(struct watchdog_device *wdd, unsigned int timeout, int err),
> +
> +	TP_ARGS(wdd, timeout, err),
> +
> +	TP_STRUCT__entry(
> +		__field(int, id)
> +		__field(unsigned int, timeout)
> +		__field(int, err)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->id = wdd->id;
> +		__entry->timeout = timeout;
> +		__entry->err = err;
> +	),
> +
> +	TP_printk("watchdog%d timeout=%u err=%d", __entry->id, __entry->timeout, __entry->err)
> +);

Nit, but I would probably put the above TRACE_EVENT() below the two
DEFINE_EVENT()s below. That way we have all the DEFINE_EVENT()s for a
specific DECLARE_EVENT_CLASS() together. Otherwise people may get confused.

-- Steve



> +
> +DEFINE_EVENT(watchdog_template, watchdog_ping,
> +	TP_PROTO(struct watchdog_device *wdd, int err),
> +	TP_ARGS(wdd, err));
> +
> +DEFINE_EVENT(watchdog_template, watchdog_stop,
> +	TP_PROTO(struct watchdog_device *wdd, int err),
> +	TP_ARGS(wdd, err));
> +
> +#endif /* !defined(_TRACE_WATCHDOG_H) || defined(TRACE_HEADER_MULTI_READ) */
> +