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

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Date:	Wed, 25 Feb 2009 00:16:38 -0500
From:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	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>,
	"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

* Andrew Morton (akpm@...ux-foundation.org) wrote:
> On Tue, 24 Feb 2009 23:08:56 -0500 (EST) Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> > > Gad, what a lot of stuff.
> > > 
> > > Use strncpy_from_user()?
> > > 
> > > Use strstrip()?
> > > 
> > > Why do we care about leading and trailing whitespace - user error!
> > 
> > This is because i want:
> > 
> >  cat available_events > set_event
> > 
> > to work.
> 
> :(
> 
> Why on earth do we keep on putting all these pretty-printers and
> pretty-parsers into the kernel?  I mean, how hard is it for userspace
> to read a text file, do some basic substitutions and print it out again?
> 

... or to read a binary buffer and format it in text, which is much more
efficient... :) If that's the kind of feature you are looking for, you
will probably like this aspect of the LTTng patchset. I should really,
really post it soon.

Mathieu


-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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