linux-kernel - Re: [RFC][PATCH 2/2] tracing/x86: basic implementation of syscall tracing for x86-64

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Date:	Fri, 13 Mar 2009 17:37:02 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Martin Bligh <mbligh@...gle.com>
Subject: Re: [RFC][PATCH 2/2] tracing/x86: basic implementation of syscall
	tracing for x86-64


* Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:

> * Frederic Weisbecker (fweisbec@...il.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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