[ltt-dev] Is it possible to use LTTng on XEN Hypervisor?

[Mathieu Desnoyers]

* hj lee (kerdosa at gmail.com) wrote:
> On Mon, Mar 1, 2010 at 7:44 PM, Mathieu Desnoyers <
> compudj at krystal.dyndns.org> wrote:
> 
> > * hj lee (kerdosa at gmail.com) wrote:
> > > On Mon, Mar 1, 2010 at 1:49 PM, Mathieu Desnoyers <
> > > compudj at krystal.dyndns.org> wrote:
> > >
> > > > * hj lee (kerdosa at gmail.com) wrote:
> > > > > Hi,
> > > > >
> > > > > I using XEN, and like to try LTTng on XEN to debug some performance
> > > > issue.
> > > > > Is LTTng ported to XEN? Is there any instruction how to use LTTng on
> > XEN?
> > > >
> > > > A very old version of LTTng has been ported to Xen. It's not even
> > > > referenced on the lttng website anymore, but see this thread for
> > > > information:
> > > >
> > > >
> > http://lists.xensource.com/archives/html/xen-devel/2007-06/msg00900.html
> > > >
> > > > The mercurial repository still exists.
> > > >
> > > > Good luck,
> > > >
> > > > Mathieu
> > > >
> > > >
> > > Thank you for the link. We are using the latest XEN 3.3.1. Can I ask why
> > you
> > > don't maintain or update LTTng for XEN?
> >
> > It would double the effort of maintaining the LTTng tree through newer
> > Linux kernel versions, requiring to follow the Xen tree too. Also, every
> > change to the LTTng API, trace format, etc, would have to be done for
> > Xen too. We are currently doing something similar with UST (for
> > user-space tracing): this requires a separate maintainer for the UST
> > tree, who pull changes from the kernel LTTng periodically.
> >
> > So in the end, it does not seem to be worth the effort. On my side at
> > least.
> >
> >
> I understand you. Is it OK for me to do this work and publish on public
> website like google project or sourceforge? Once I make it working, then I
> am going to produce a LTTng patch for every XEN major release.

Sure, please keep me informed of the updates, and we'll make sure to
link to the Xen-lttng tree from the lttng.org website.

Thanks,

Mathieu

> 
> Thanks

-- 
Mathieu Desnoyers
Operating System Efficiency Consultant
EfficiOS Inc.
http://www.efficios.com