linux-kernel - Re: [PATCH 3/6] perf script: move printing of 'common' data from print

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Message-ID: <20110310155109.GB23555@ghostprotocols.net>
Date:	Thu, 10 Mar 2011 12:51:09 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	David Ahern <daahern@...co.com>, linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org, mingo@...e.hu, peterz@...radead.org,
	fweisbec@...il.com, paulus@...ba.org, tglx@...utronix.de
Subject: Re: [PATCH 3/6] perf script: move printing of 'common' data from
 print_event and rename

Em Thu, Mar 10, 2011 at 10:20:53AM -0500, Steven Rostedt escreveu:
> On Wed, Mar 09, 2011 at 10:23:25PM -0700, David Ahern wrote:
> > This change does impact output: latency data is trace specific and is now
> > printed after the common data - comm, tid, cpu, time and event name.

> > Signed-off-by: David Ahern <daahern@...co.com>

> >  tools/perf/builtin-script.c         |   38 ++++++++++++++++++++++-----
> >  tools/perf/util/trace-event-parse.c |   49 +++++++---------------------------

> I was hoping after the next merge window to start making a common library
> for parsing events. This way things like powertop and timechart or
> anything that uses the perf interface does not need to write its own
> parsing of events, or expect the event formats to be hardcoded.
> 
> The trace-event-parse.c was taking from trace-cmd's parse-events.c code
> and hopefully the two can merge again. The parse-events.c code in
> trace-cmd has gone through several iterations that has made it much more
> robust and flexible. I purposely kept it as a separate libarary not
> dependent on trace-cmd so that it could be used by other utilities like
> perf.

David is kinda new to this perf/ftrace/trace-cmd/etc soap opera, and he
has been patient to go thru the motions with Peter, Thomas, Frédéric and
me, going from doing what he wants in 'perf report' to 'perf script',
etc.

We're almost to the point where his feature is implemented in a
way Frédéric, the one most actively reviewing his work, is satisfied,
right Frédéric?

I think the merge with the libraries you mention is something that is
not a precondition to merging David's work.

And his work is at least moving things in the trace parts of tools/,
that was so far dormant.

- Arnaldo
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