linux-kernel - Re: [RFC] tracefs

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Date:	Fri, 23 Oct 2009 07:35:30 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Greg KH <greg@...ah.com>, Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC] tracefs


* Steven Rostedt <rostedt@...dmis.org> wrote:

> On Thu, 2009-10-22 at 17:49 -0700, Greg KH wrote:
> > Hi all,
> > 
> > At LinuxCon this year, Steven and I talked about moving the debugfs
> > usage in the tracing core to a stand-alone filesystem to give the
> > ability to start to lock down the api so that people an count on what is
> > going on in the tracing userspace interface.
> > 
> > So, on the flight to Tokyo for the kernel summit, I wrote up tracefs.
> > Here's the first very rough cut at it below.  I've run it here on my
> > laptop, and all seems well, but I do have a few questions:
> >   - I've made the mount point be /sys/kernel/trace/  Is that ok?  Should
> >     it be /sys/kernel/tracing/?  Or something else?  You get to pick the
> >     mount point now, so I don't want to hear any more grumblings about
> >     the location in the future :)
> 
> /trace
> 
>  (rostedt hides)

No, what we want is either /sys/events/ or /proc/events/ alike place to 
expose event logging formats (i.e. the /debug/tracing/events/ details). 
Those are clean enough to be exposed as an ABI - and it would be a good 
point to start.

	Ingo
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