<div class="gmail_quote">On Sun, Jan 25, 2009 at 12:55 AM, Noel Welsh <<a href="mailto:noelwelsh@gmail.com">noelwelsh@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> There is the existing logging facility, but it isn't dynamic like dtrace. </blockquote><div> Thanks Noel - for now the combo of logging, trace, and exception will do.  The challenge with trace is of course that it doesn't work with modules unless you can afford to modify, stop and restart services, so not very handy for real-time production environment debugging.  What's your experience like in this regard? I imagine dtrace-like functionality is "a lot of work" to implement, but is it plausible with the current PLT scheme architecture? Thanks, yc </div></div>