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

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Message-ID: <20090225081118.GC15303@elte.hu>
Date:	Wed, 25 Feb 2009 09:11:18 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	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


* 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?

Note that there's no mandatory user-space component here - the 
final destination is the kernel developer's eyes in 90% of the 
cases. These traces get pasted into email, etc. etc.

So leading spaces, meaningful formatting and general hands-on 
usability is important. [ I know, it's a strange concept in the 
kernel, we tend to have a perversion for the most unusable and 
most inconsistent user interfaces ;-) ]

It's also a balancing act. We dont want to put all of TeX into 
the kernel obviously. Nor do we want the default to be the 
opposite end of the spectrum: to output raw binary records. So 
we find some middle ground. That middle ground is inluenced by 
the developers using this stuff.

	Ingo
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