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 12:50:20 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Ingo Molnar <mingo@...e.hu>
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

* Ingo Molnar (mingo@...e.hu) wrote:
> 
> * 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.
> 

The nice part about the TIF bit is that it permits adding this syscall
tracing feature without increasing the size of the thread_info struct
nor adding any extra tests in entry.S. Does the tracehook callback have
these features ?

Mathieu

> 	Ingo

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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