Re: Tracepoint enhancements

[Stan Shebs <stan at codesourcery dot com>]

Jeremy Bennett wrote:
> On Fri, 2008-10-31 at 12:57 -0700, Stan Shebs wrote:
>   
> > A bigger change would be to introduce a general notion of execution 
> > history, which could subsume fork checkpoints and trace snapshots, maybe 
> > tie into some versions of reverse debugging as well.
> >     
>
> Which also requires a way of specifying what execution you are talking
> about. A uniform way of addressing potentially hundreds of thousands of
> threads of control individually and in arbitrary groupings.
>
>   
The "inferior/thread set" syntax for multiprocess GDB has the ability to 
do numerical ranges and unions and such, so it gets at least part of the 
way there. One of the things that struck me about TotalView is that they 
introduced dozens of special-purpose predicates as well - 
"system-created lwps that were locked out but are now runnable and yet 
haven't run yet". :-) I suspect that practical usage with GDB will 
demonstrate that many of those are not as silly as they sound, and we'll 
be wanting our own versions!

Stan