linux-kernel - Re: [RFC][PATCH 0/2] Syscalls tracing

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Message-ID: <20090307160246.GB6075@nowhere>
Date:	Sat, 7 Mar 2009 17:02:47 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Martin Bligh <mbligh@...gle.com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [RFC][PATCH 0/2] Syscalls tracing

On Sat, Mar 07, 2009 at 01:15:18PM +0100, Peter Zijlstra wrote:
> On Sat, 2009-03-07 at 05:52 +0100, Frederic Weisbecker wrote:
> > Here is a first attempt, quick one-shot, to provide a syscall tracing
> > infrastructure on ftrace.
> > 
> > The RFC prefix is here to reflect its ugliness on various parts.
> > The compromise between tracing reliabilty and speed is hard to balance.
> > For example I guess the basic and horrid string mask should be dropped in favour
> > of something else, which takes care of the volatile strings from the userspace.
> > 
> > But I hope a lot of ideas to make it better will come along this discussion.
> 
> Can't you abuse the SYSCALL_DEFINE macros? This current approach looks
> like it will replicate the syscall table.
> 


Ah, I did not even think about it.
I will be able to get the number of parameters. Sounds good. But I will
still need a way to store their format somewhere.

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