linux-kernel - Re: [RFC PATCH 2/5] tracing/events: nicer print format for parsing

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Message-ID: <20090610093705.GA14860@infradead.org>
Date:	Wed, 10 Jun 2009 05:37:05 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Mel Gorman <mel@....ul.ie>,
	Christoph Hellwig <hch@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Peter Zijlstra <peterz@...radead.org>,
	Theodore Tso <tytso@....edu>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Zhaolei <zhaolei@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Jason Baron <jbaron@...hat.com>,
	Jiaying Zhang <jiayingz@...gle.com>
Subject: Re: [RFC PATCH 2/5] tracing/events: nicer print format for parsing

On Tue, Jun 09, 2009 at 03:45:36PM -0400, Steven Rostedt wrote:
> Note, I will still keep the TP_printk() macro, that will not change. The 
> new macro is TP_FORMAT() that preforms the tags. Thus, if you really want 
> it to print out, you can use TP_printk, but the user space tools that read 
> the binary will not know how to read it unless the printk is simple.

Keeping the two in parallel for more than a short migration period
will be a nightmare.  We should have one way to express all our tracers,
and not keep on adding special cases that userland has to deal with.

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