Subject: Re: Building a tracing userspace tool in the kernel tree
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Sam Ravnborg <sam@ravnborg.org>, linux-kernel@vger.kernel.org,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Thomas Gleixner <tglx@linutronix.de>,
       Steven Rostedt <rostedt@goodmis.org>
In-Reply-To: <20081009191626.GA29344@Krystal>
References: <20081009191626.GA29344@Krystal>
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Date: Fri, 10 Oct 2008 00:15:13 +0200
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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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