meeting minutes 20060504

[Richard J Moore]

systemtap-owner@sourceware.org wrote on 04/05/2006 22:45:30:

> On Thursday, May 04, 2006 2:09 PM, Hien Nguyen wrote:
> > BZ #2639 - Probe on "__kprobes" function ... it appears to be closed,
> > Jim will follow up this up.
>
> I just opened this yesterday, and no-one else has commented on it, so
> how is it closed?  There was #2506, which mentioned __exit and
> __kprobes.  I found a solution for __exit, but probes on __kprobes have
> more issues, so I split it into a different bug (2639).
>
> > OLS paper - Gray Brian ?? withdrew his OLS paper (Instrumentation
> > using systemtap) due to some concerns with the data that he got
> > (kprobes related issues)
>
> Ray Bryant.  And I would still like more details about what he did,
> especially if it means dealing with the concerns that he had.  If we
> don't leverage all information, I'm likely to have the same problems
> without realizing it.
>

Ray simply told me he couldn't reproduce his results. When I asked him
whether that was due to the instrumentation method he said the problem was
more fundamental. I assume he meant he was looking for a problem that
didn't exist.

As for the instrumentation: that was achieved by putting a few probes in
the VM code - not via systemtap, but via handcrafted kprobes modules.

Richard

>
> Josh