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

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Message-ID: <20101117125344.GC5464@nowhere>
Date:	Wed, 17 Nov 2010 13:53:46 +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 12:35:50PM +0100, Peter Zijlstra wrote:
> On Wed, 2010-11-17 at 09:30 +0100, Ingo Molnar wrote:
> > > For example I'm currently working with dozens of trace_printk() and I would be 
> > > very happy to turn some of them off half of the time.
> > 
> > I guess we could try such a patch. If you send a prototype i'd be interested in 
> > testing it out.
> 
> I don't see the point, the kernel shouldn't contain any trace_printk()s
> to begin with..


It's oriented toward developers. Those who use dozens of tracepoints in
their tree because they are debugging something or developing a new feature,
they might to deactivate/reactivate some of these independant points.

This can also apply to dynamic_printk of course.

Well, the very first and main point is to standardize trace_printk into
a trace event so that it gets usable by perf tools. I have been asked many
times "how to use trace_printk() with perf?".

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