linux-kernel - Re: [PATCH][RFC] vsprintf: unify the format decoding layer for its 3 users

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Message-Id: <20090227004513.f53ed532.akpm@linux-foundation.org>
Date:	Fri, 27 Feb 2009 00:45:13 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH][RFC] vsprintf: unify the format decoding layer for its
 3 users

On Fri, 27 Feb 2009 09:32:12 +0100 Ingo Molnar <mingo@...e.hu> wrote:

> 
> 
> a printf variant that outputs not into a string buffer but into 
> a binary-values buffer.

Oh, OK.

Of course, parsing a printf string (using our
nobody-bothered-optimising-it parser) isn't particularly efficient
either.

Is there a case here for adding a new way of describing how to
serialise the incoming data?  Perhaps with a new and simpler control
string or perhaps even

	struct ftrace_thing ft;

	init_ftrace_thing(&ft, "%d %l %s");
	add_ftrace_thing_int(&ft, some_int);
	add_ftrace_thing_long(&ft, some_long);
	add_ftrace_thing_string(&ft, some_string);
	emit_ftrace_thing(&ft);

or some similar thing.
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