From: Arjan van de Ven <arjan@linux.intel.com>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: perf: store and retrieve trace event names in the perf.data file
Date: Sun, 09 Aug 2009 16:01:30 -0700 [thread overview]
Message-ID: <4A7F554A.8080402@linux.intel.com> (raw)
In-Reply-To: <20090809224400.GA6089@nowhere>
Frederic Weisbecker wrote:
> On Sun, Aug 09, 2009 at 02:49:23PM -0700, Arjan van de Ven wrote:
>> In order to be able to use trace events, a key aspect is the "type" field;
>> this is the id of the event that you recorded, as stored in the /sys/kernel/debug/events/*/*/id file.
>> What is currently missing is a way to map the id number (which is not abi stable)
>> to the event that was recorded.
>
>
>
> We already have that.
> See tools/perf/util/parse-events.c: char *tracepoint_id_to_name(u64 id)
sadly... we don't.
You do it *on the same boot and machine* as you created the perf.data file.
You don't have it when you reboot into a new kernel, or move the perf.data file
to a new machine........
Which is to be honest a very common usecase.
next prev parent reply other threads:[~2009-08-09 23:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-09 21:49 perf: store and retrieve trace event names in the perf.data file Arjan van de Ven
2009-08-09 22:44 ` Frederic Weisbecker
2009-08-09 23:01 ` Arjan van de Ven [this message]
2009-08-09 23:04 ` Frederic Weisbecker
2009-08-09 23:10 ` Arjan van de Ven
2009-08-10 9:50 ` Peter Zijlstra
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