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Message-ID: <20101209215031.GA9296@Krystal>
Date: Thu, 9 Dec 2010 16:50:31 -0500
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Frederic Weisbecker <fweisbec@...il.com>
Cc: Steven Rostedt <rostedt@...dmis.org>,
Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
Li Zefan <lizf@...fujitsu.com>,
William Cohen <wcohen@...hat.com>,
Jun'ichi Nomura <j-nomura@...jp.nec.com>,
Theodore Ts'o <tytso@....edu>, Jason Baron <jbaron@...hat.com>,
Mel Gorman <mel@....ul.ie>,
Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>,
Marcelo Tosatti <mtosatti@...hat.com>,
Avi Kivity <avi@...hat.com>, Gleb Natapov <gleb@...hat.com>,
Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
Neil Horman <nhorman@...driver.com>,
Arjan van de Ven <arjan@...ux.intel.com>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Kei Tokunaga <tokunaga.keiich@...fujitsu.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Oleg Nesterov <oleg@...hat.com>,
Masami Hiramatsu <mhiramat@...hat.com>,
Josh Stone <jistone@...hat.com>,
Xiao Guangrong <xiaoguangrong@...fujitsu.com>,
Thomas Gleixner <tglx@...utronix.de>,
Zhaolei <zhaolei@...fujitsu.com>,
Anton Blanchard <anton@...ba.org>
Subject: Re: [RFC PATCH] ftrace trace event: introduce assignment macros
* Frederic Weisbecker (fweisbec@...il.com) wrote:
> On Thu, Dec 09, 2010 at 11:22:11AM -0500, Mathieu Desnoyers wrote:
> > This patch proposes encapsulation of the raw assignments within TP_fast_assign()
> > by introducing tp_assign() and tp_memcpy() macros. This will allow us to:
> >
> > - generically filter from input fields,
> > - redefine the field write primitives.
> >
> > The current macros map directly to the old code. I changed the documentation in
> > tracepoint.txt to reflect these new primitives, but all TRACE_EVENT() users
> > should gradually update their code to use these macro wrappers rather than raw
> > "=" assignments or mempcy() calls.
Hrm, while we are there, I notice the presence of __assign_str(). Maybe we
should also create the following mapping, for the sake of streamlining the
interface:
#define tp_strcpy(dest, src) __assign_str(dest, src)
Thoughts ?
Thanks,
Mathieu
--
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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