linux-kernel - Re: [PATCH] thermal: trace: migrating thermal traces to use TRACE_DEFINE

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Date:	Thu, 3 Mar 2016 17:10:46 +0000
From:	Michele DiGiorgio <michele.digiorgio@....com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	<linux-pm@...r.kernel.org>, Ingo Molnar <mingo@...hat.com>,
	Javi Merino <javi.merino@....com>,
	<linux-kernel@...r.kernel.org>,
	Punit Agrawal <punit.agrawal@....com>,
	Eduardo Valentin <edubezval@...il.com>
Subject: Re: [PATCH] thermal: trace: migrating thermal traces to use
 TRACE_DEFINE_ENUM() macros

Hello Steven,

Thanks for acknowledging the patch.

Will you be merging it or should I refer to somebody else?

Kind regards,
Michele

On 01/03/16 18:20, Steven Rostedt wrote:
> On Tue,  1 Mar 2016 17:38:54 +0000
> Michele Di Giorgio <michele.digiorgio@....com> wrote:
>
> > Userspace tools are not aware of how to convert the enums provided by
> > the tracepoints to their corresponding strings.
> >
> > Adding TRACE_DEFINE_ENUM() macros allows to make the enums available
> > to userspace to let the tools know what those enum values represent.
> >
> > In particular, for thermal zone trip types what we obtained before was
> > something like:
> >
> > kworker/1:1-460   [001]   320.372732: thermal_zone_trip:    thermal_zone=soc
> >                 id=0 trip=1 trip_type=1
> >
> > Unfortunately, userspace tools do not know how to convert enum values to
> > strings and as a consequence they can only forward the enum value to the
> > output. By using TRACE_DEFINE_ENUM() macros for thermal traces we get the
> > following trace line:
> >
> > kworker/1:1-460   [001]   320.372732: thermal_zone_trip:    thermal_zone=soc
> >                 id=0 trip=1 trip_type=PASSIVE
> >
> > Userspace tools are now able to better understand the meaning of the trip_type
> > and provide the user with more readable information.
> >
>
> Acked-by: Steven Rostedt <rostedt@...dmis.org>
>
> -- Steve
>

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