Date: Fri, 13 Mar 2009 17:37:02 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
       LKML <linux-kernel@vger.kernel.org>,
       Lai Jiangshan <laijs@cn.fujitsu.com>,
       Steven Rostedt <rostedt@goodmis.org>,
       Peter Zijlstra <peterz@infradead.org>,
       Jiaying Zhang <jiayingz@google.com>, Martin Bligh <mbligh@google.com>
Subject: Re: [RFC][PATCH 2/2] tracing/x86: basic implementation of syscall
	tracing for x86-64
Message-ID: <20090313163702.GA9082@elte.hu>
References: <1236401580-5758-1-git-send-email-fweisbec@gmail.com> <1236401580-5758-3-git-send-email-fweisbec@gmail.com> <20090313163207.GA3354@Krystal>
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* Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> wrote:

> * Frederic Weisbecker (fweisbec@gmail.com) wrote:
>
> > Provide the ptrace hooks and arch specific syscall numbers 
> > to ftrace arch indepedant syscall numbers. For now it only 
> > supports 4 syscalls to provide an example.
> > 
> 
> Hi Frederic,
> 
> I already have the equivalent TIF_KERNEL_TRACE flag in my 
> LTTng tree added to every Linux architecture. You might want 
> to re-use this work rather than re-doing this. I don't mind 
> changing the flag name.

Yeah. Note that the TIF bits are just one part - there are other 
bits needed for HAVE_FTRACE_SYSCALLS arch support.

Also, i'd eventually expect the TIF bits to be converted to a 
tracehook callback, not spread it to other architectures.

	Ingo
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