linux-kernel - Re: [PATCH 0/4][RFC] event tracer

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Date:	Tue, 24 Feb 2009 20:15:01 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
cc:	Masami Hiramatsu <mhiramat@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	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>
Subject: Re: [PATCH 0/4][RFC] event tracer


On Tue, 24 Feb 2009, Mathieu Desnoyers wrote:

> * Steven Rostedt (rostedt@...dmis.org) wrote:
> > 
> > On Tue, 24 Feb 2009, Masami Hiramatsu wrote:
> > > > 
> > > > #undef TPFMT
> > > > #define TPFMT(fmt, args...) \
> > > > 	"(%s)" fmt "\n", #call, ##args
> > > > 
> > > > and then I could do
> > > > 
> > > > 	event_printk(fmt);
> > > 
> > > Why don't you do as below? :)
> > > 	event_printk_line("(" #call ")" ##fmtandargs);
> > 
> > Still need to sneak that "\n" in ;-)
> > 
> 
> Why do you need the \n ? Having all event format strings ending with \0
> should be enough to tell event_printk to generate a \n each time it
> encounters a format string \0. Doing so would save 1 byte per format
> string.

Because currently event_printk uses a generic function that acts pretty 
much like ftrace_printk.

I like having fmt and args separate. This way, we can add more stuff to 
the end if we ever want to. For now it's a '\n'. We can deal with 
those extra bytes.

-- Steve

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