linux-kernel - Re: [PATCH 1/2] perf: Add persistent events

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Date:	Thu, 17 Jun 2010 19:31:42 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Borislav Petkov <bp@...en8.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Lin Ming <ming.m.lin@...el.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] perf: Add persistent events

From: Steven Rostedt <rostedt@...dmis.org>
Date: Thu, Jun 17, 2010 at 12:19:57PM -0400

> On Thu, 2010-06-17 at 15:43 +0200, Borislav Petkov wrote:
> 
> > > One of the goals at least I have with pursuing this path is to separate
> > > out everything that is not strictly 'perf' into things that can be reused
> > > by other tools, like yours.
> > 
> > I'm still splitting perf/util into a more or less generic lib.
> > Now, I want to reuse as much code as possible and am parsing
> > the "mce:mce_record" tracepoint using parse_events(). However,
> > this means that I have to push the not-so-generic perf bits
> > like util/parse-events.c into the lib. Which, in turn, pulls in
> > util/trace-event* etc.
> 
> Note, I have a separate generic library in trace-cmd that has the
> parsing of trace events as its own library now.
> 
> This is the code that started trace-event-parse.c.
> 
> It has evolved quite a bit since then. You can get the code from:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git
> 
> The files are parse-events.c and parse-events.h. As well as some
> filtering code: parse-filter.c.
> 
> It creates a libparsevent library.
> 
> I've been meaning to update the perf stuff with it, but just have not
> had the time. Seems that what you are doing might be a good fit for it.

I see, well, I could take it and merge it into tools/trace-cmd or
something and then we all could gradually weed out common code. But I'm
open to other suggestions as well.

I mean, it is only natural if we merry perf and ftrace in kernel space
to do the same in userspace, right :)

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach
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