linux-kernel - Re: [RFC PATCH 3/3] thermal: trace: Trace when temperature is above a trip point

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Date:	Thu, 12 Jun 2014 17:16:34 +0100
From:	Punit Agrawal <punit.agrawal@....com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	"linux-pm\@vger.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	Javi Merino <Javi.Merino@....com>,
	Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <edubezval@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [RFC PATCH 3/3] thermal: trace: Trace when temperature is above a trip point

Steven Rostedt <rostedt@...dmis.org> writes:

[...]

>> 
>> # pwd /sys/kernel/debug/tracing/events/thermal/thermal_zone_trip
>> # cat format
>> name: thermal_zone_trip
>> ID: 463
>> format:
>>         field:unsigned short common_type;       offset:0;       size:2; signed:0;
>>         field:unsigned char common_flags;       offset:2;       size:1; signed:0;
>>         field:unsigned char common_preempt_count;       offset:3;       size:1; signed:0;
>>         field:int common_pid;   offset:4;       size:4; signed:1;
>> 
>>         field:__data_loc char[] thermal_zone;   offset:8;       size:4; signed:0;
>>         field:int id;   offset:12;      size:4; signed:1;
>>         field:int trip; offset:16;      size:4; signed:1;
>>         field:enum thermal_trip_type trip_type; offset:20;      size:4; signed:0;
>> 
>> print fmt: "thermal_zone=%s id=%d trip=%d trip_type=%s",
>> __get_str(thermal_zone), REC->id, REC->trip,
>> __print_symbolic(REC->trip_type, { THERMAL_TRIP_ACTIVE, "active" },
>> { THERMAL_TRIP_PASSIVE, "passive" }, { THERMAL_TRIP_HOT, "hot" }, {
>> THERMAL_TRIP_CRITICAL, "critical" })
>> 
>
> For it to work with trace-cmd (and perf) you'll need to add a plugin to
> define what those enums are. This is the file that trace-cmd uses to
> foramat. But it has no idea how to convert something like
> THERMAL_TRIP_PASSIVE into a number.
>

Hmm, right. I was working under the assumption that the enum values will
be converted to their numeric representation when compiled.

I think it's better to convert the enum to int in the trace event - the
changes are localised and the tool will work as well.

Rui, Eduardo what do you think?

Punit

> -- Steve
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