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

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Date:	Wed, 11 Jun 2014 15:53:42 +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:

> On Wed, 11 Jun 2014 15:11:02 +0100
> Punit Agrawal <punit.agrawal@....com> wrote:
>  
>> I do indeed see the value of trip_type and it matches what's being
>> traced.
>> 
>> ~# trace-cmd report | grep thermal_zone_trip | tail -n 5
>>      kworker/2:2-1014  [002]   125.623213: thermal_zone_trip:    thermal_zone=soc_thermal id=0 trip=0 trip_type=
>>      kworker/2:2-1014  [002]   125.743174: thermal_zone_trip:    thermal_zone=soc_thermal id=0 trip=0 trip_type=
>>      kworker/2:2-1014  [002]   125.863196: thermal_zone_trip:    thermal_zone=soc_thermal id=0 trip=0 trip_type=
>>      kworker/2:2-1014  [002]   125.983175: thermal_zone_trip:    thermal_zone=soc_thermal id=0 trip=0 trip_type=
>>      kworker/2:2-1014  [002]   126.103173: thermal_zone_trip:    thermal_zone=soc_thermal id=0 trip=0 trip_type=
>> ~# trace-cmd report -R | grep thermal_zone_trip | tail -n 5
>>      kworker/2:2-1014  [002]   125.623213: thermal_zone_trip:     thermal_zone=soc_thermal id=0 trip=0 trip_type=1
>>      kworker/2:2-1014  [002]   125.743174: thermal_zone_trip:     thermal_zone=soc_thermal id=0 trip=0 trip_type=1
>>      kworker/2:2-1014  [002]   125.863196: thermal_zone_trip:     thermal_zone=soc_thermal id=0 trip=0 trip_type=1
>>      kworker/2:2-1014  [002]   125.983175: thermal_zone_trip:     thermal_zone=soc_thermal id=0 trip=0 trip_type=1
>>      kworker/2:2-1014  [002]   126.103173: thermal_zone_trip:     thermal_zone=soc_thermal id=0 trip=0 trip_type=1
>> 
>> Is there something I should be doing to enable the translation to the
>> string representation when reporting using trace-cmd?
>
> Out of curiosity, what does the format file for it look like?

I didn't know this was being exported. Thanks for the pointer.

>
> /sys/kernel/debug/thermal/thermal_zone_trip/format

I don't have this file but found the following which seems to contain
the format.

# 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" })

Cheers,
Punit

>
> -- Steve
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