linux-kernel - Re: [PATCH v2] rtc: Add tracepoints for RTC system

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Message-ID: <20171213122329.GU8318@piout.net>
Date:   Wed, 13 Dec 2017 13:23:29 +0100
From:   Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Baolin Wang <baolin.wang@...aro.org>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>, linux-rtc@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] rtc: Add tracepoints for RTC system

On 13/12/2017 at 12:16:03 +0000, Mark Brown wrote:
> On Wed, Dec 13, 2017 at 12:04:26PM +0100, Alexandre Belloni wrote:
> 
> > Also, I think we could try having only the time64_t in the ring buffer.
> > Maybe I'm wrong but I think tools reading that buffer can do the
> > conversion themselves. Maybe I don't understand correctly how
> > tracepoints work and this doesn't make sense, tell me.
> 
> Tools reading the buffer can do the conversion themselves but it's also
> useful for users to just view the log directly via tracing/trace
> sometimes.  OTOH the whole point is to be low overhead so...

Yes, that is why I suggest keeping both representation in the printk
but only time64_t in the buffer. And this would be more convenient if we
add a way to pretty print a time64_t in vsprintf.

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com