linux-kernel - Re: [PATCH 4/8] perf data: Add a 'perf' prefix to the generic fields

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Message-ID: <5489E937.2050102@linutronix.de>
Date:	Thu, 11 Dec 2014 19:57:59 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...nel.org>,
	linux-kernel@...r.kernel.org
CC:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jeremie Galarneau <jgalar@...icios.com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Tom Zanussi <tzanussi@...il.com>
Subject: Re: [PATCH 4/8] perf data: Add a 'perf' prefix to the generic fields

On 12/11/2014 07:55 PM, David Ahern wrote:
> On 12/11/14 8:12 AM, Jiri Olsa wrote:
> 
>> Before:
>>    $ babeltrace ./ctf-data/
>>    [03:19:13.962131936] (+0.000001935) cycles: { }, { ip =
>> 0xFFFFFFFF8105443A, tid = 20714, pid = 20714, period = 8 }
>>    [03:19:13.962133732] (+0.000001796) cycles: { }, { ip =
>> 0xFFFFFFFF8105443A, tid = 20714, pid = 20714, period = 114 }
>>    ...
>>
>> Now:
>>    $ babeltrace ./ctf-data/
>>    [03:19:13.962131936] (+0.000001935) cycles: { }, { perf_ip =
>> 0xFFFFFFFF8105443A, perf_tid = 20714, perf_pid = 20714, perf_period = 8 }
>>    [03:19:13.962133732] (+0.000001796) cycles: { }, { perf_ip =
>> 0xFFFFFFFF8105443A, perf_tid = 20714, perf_pid = 20714, perf_period =
>> 114 }
>>    ...
> 
> How is babeltrace showing time-of-day for perf-based data files? Is that
> tod when the command is run?

CTF needs an a base offset which we set to 0 because we don't have it.
It then takes the NS timestamp and computes the "time".

> David

Sebastian
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