linux-kernel - Re: Building a tracing userspace tool in the kernel tree

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Message-Id: <1223590513.7382.45.camel@lappy.programming.kicks-ass.net>
Date:	Fri, 10 Oct 2008 00:15:13 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Sam Ravnborg <sam@...nborg.org>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: Building a tracing userspace tool in the kernel tree

On Thu, 2008-10-09 at 15:16 -0400, Mathieu Desnoyers wrote:
> Hi Sam,
> 
> At the kernel summit, people seemed to be interested to have the basic
> userspace tools required to extract and pretty-print a trace available
> within the kernel tree. Therefore, what I am trying to do is something
> along the lines of
> 
> ltt/usr/
> ltt/usr/tracectl/    (control tracing)
> ltt/usr/tracesplice/ (splice buffers to disk)
> ltt/usr/tracecat/    (merge sort and format the binary buffers into
>                       human-readable text)

I'd rather have you provide that interface from the kernel much like
ftrace does. So we can do:

# cat /debug/tracing/lttng/trace



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