[ltt-dev] LTTng userspace tracing

[Mathieu Desnoyers]

* Andrew McDermott (andrew.mcdermott at windriver.com) wrote:
> 
> Hi Mathieu,
> 
> > * Andrew McDermott (andrew.mcdermott at windriver.com) wrote:
> >> 
> >> Hi,
> >> 
> >> I was reading:
> >> 
> >>     http://ltt.polymtl.ca/svn/trunk/lttv/doc/developer/ust.html 
> >> 
> >> and wondered if there was an implementation based on this design.  I had
> >> a poke around the SVN repo but it wasn't clear to me if this directory:
> >> 
> >>     http://ltt.polymtl.ca/svn/trunk/markers-userspace/
> >> 
> >> was related.
> >> 
> >
> > Hi Andrew,
> >
> > Yes, we have a working userspace implementation, but we are clearing out
> > the last details involved with distributing it under the LGPL license.
> > There are a few GPL dependencies we are taking care of.
> >
> > E.g., we just had the OK from IBM to re-license their contribution to my
> > userspace RCU library to LGPL, which was the most important piece of the
> > puzzle. The rest is mostly atomic operations and a rcu list iteration.
> >
> > And the last thing we would want is people to think that we are
> > distributing the userspace tracing library under a license too
> > restrictive for their use.
> >
> > Second answer : the markers-userspace directory content has been re-used
> > in the implementation I think, but has been repackaged. I am putting
> > Pierre-Marc in CC, who did the userspace tracing port of LTTng.
> 
> Thanks.
> 
> One more question: is it feasible (within reason) for me to backport
> this to say linux-2.6.14 or linux-2.6.21.
> 

Sure, there is almost no external dependency. Except for trace clocks
maybe, whenever we would need to implement them through vDSO pages.

Mathieu

> > Thanks for the interest you show :)
> 
> It would/will be extremely useful!
> 
> --andy
> 
> >
> > Mathieu
> >
> >> Thanks,
> >> Andy.
> >> 
> >> _______________________________________________
> >> ltt-dev mailing list
> >> ltt-dev at lists.casi.polymtl.ca
> >> http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
> >> 
> 
> -- 
> andy
> 

-- 
Mathieu Desnoyers
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