linux-kernel - Re: [ANNOUNCE] New utility: 'trace'

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Message-ID: <20101117141031.GH5464@nowhere>
Date:	Wed, 17 Nov 2010 15:10:33 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Darren Hart <dvhart@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Jason Baron <jbaron@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Christoph Hellwig <hch@....de>,
	Pekka Enberg <penberg@...nel.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [ANNOUNCE] New utility: 'trace'

On Wed, Nov 17, 2010 at 02:53:49PM +0100, Peter Zijlstra wrote:
> On Wed, 2010-11-17 at 14:43 +0100, Frederic Weisbecker wrote:
> > 
> > > Yes, trace_printk() is a pure debug interface, solely meant for the edit
> > > + reboot cycle.
> > 
> > So why prevent from making it even more handy?
> > 
> > 
> > > If you want anything more than that we've got tracepoints. The rule up
> > > until now has been to never merge a trace_printk() user.
> > 
> > Sure, that doesn't change the core idea of trace_prink(): none of them must
> > be merged. That new event interface would just make private uses of trace_printk()
> > more convenient. 
> 
> I don't get it, if you don't want it, why put it there in the first
> place?
> 
> I've never found myself thinking, oh damn, I didn't want to see that
> one!, only damn, I should have added more :-)


Hehe :)

Yeah I have a strange workflow. I'm working on that CPU isolation thing
and I have dozens of trace_printk all over the place for tons of
things. And everytime I remove one to unwind some output or to focus
on another one, I often have to restore it later because I need it
again. Usually I even just comment it out instead of removing it.

If I could make this dynamically on a per line filtering, or sometimes on
a per file granularity (as both are equally often the case for me), I would
probably win some time.

I just don't know how many developers have a similar workflow than mine.

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