linux-kernel - Re: [PATCH 2/4] tracing: add event trace infrastructure

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Message-ID: <20090225091041.GB30940@elte.hu>
Date:	Wed, 25 Feb 2009 10:10:41 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Theodore Tso <tytso@....edu>,
	Arjan van de Ven <arjan@...radead.org>,
	Pekka Paalanen <pq@....fi>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jason Baron <jbaron@...hat.com>,
	Martin Bligh <mbligh@...gle.com>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 2/4] tracing: add event trace infrastructure


* Pekka Enberg <penberg@...helsinki.fi> wrote:

> Hi Andrew,
> 
> On Wed, Feb 25, 2009 at 10:28 AM, Andrew Morton
> <akpm@...ux-foundation.org> wrote:
> > A better approach would be to design simple, robust kernel interfaces
> > which make sense and which aren't made all complex by putting the user
> > interface in kernel space.  And to maintain corresponding userspace
> > tools which manipulate and present the IO from those kernel interfaces.
> 
> We did this for kmemtrace and quite frankly, I usually end up 
> spending more time figuring out how to export the data from a 
> virtual machine than actually analyzing the results. What 
> makes ftrace so cool is the fact that it has almost 
> zero-overhead for setup and that the text-based data format 
> plays well with simple scripting tools available everywhere.

I just tried to write a similar reply - and ended up with a long 
5 page mail which was just repeating points others and me made 
before.

Instead i'll now print out your reply and will hang it on the 
wall ... ;-)

	Ingo
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