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Date: Thu, 11 Dec 2014 19:57:59 +0100
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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To: David Ahern <dsahern@gmail.com>, Jiri Olsa <jolsa@kernel.org>,
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CC: Arnaldo Carvalho de Melo <acme@redhat.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Jeremie Galarneau <jgalar@efficios.com>,
        Namhyung Kim <namhyung@gmail.com>, Paul Mackerras <paulus@samba.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Tom Zanussi <tzanussi@gmail.com>
Subject: Re: [PATCH 4/8] perf data: Add a 'perf' prefix to the generic fields
References: <1418310749-22267-1-git-send-email-jolsa@kernel.org> <1418310749-22267-5-git-send-email-jolsa@kernel.org> <5489E88A.3000801@gmail.com>
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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