linux-kernel - Re: Using sched_clock for mmio-trace

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Date:	Fri, 16 Feb 2007 10:44:15 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Jeff Muizelaar <jeff@...idigm.net>
Cc:	"Frank Ch. Eigler" <fche@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: Using sched_clock for mmio-trace

On Fri, 16 Feb 2007 13:30:14 -0500 Jeff Muizelaar wrote:

> On Fri, Feb 16, 2007 at 11:30:56AM -0500, Frank Ch. Eigler wrote:
> > Jeff Muizelaar <jeff@...idigm.net> writes:
> > 
> > > I've built a tool with the goal of logging mmio writes and reads by
> > > device drivers. See http://nouveau.freedesktop.org/wiki/MmioTrace.
> > 
> > FWIW, this is exactly a type of add-on trace patch that could be
> > mooted by adoption of the ltt/systemtap "marker" facility.  With it,
> > you would not need so much code (e.g. no new user-space tools at all,
> > reuse of common tracing buffer logic, permanently placed hooks) and
> > would probably get more utility.
> 
> Is there more information on this "marker" facility? e.g. what is a
> marker? Are they just like tracepoints?

On lkml for the past few days/months.
Look for "Linux Kernel Markers" in the subject line.

Mathieu, do you have a web site for LK Markers?

---
~Randy
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