Discussion at Linux Foundation Japan Symposium

[K.Prasad]

On Thu, Dec 18, 2008 at 06:57:57PM +0900, KOSAKI Motohiro wrote:
> > > Of cource, this approach indicate systemtap lost some feature.
> > > (e.g. above section don't have line number information and local
> > >  variable name information)
> > > 
> > > but it is still useful for average tracing user.
> > >
> > I'm not sure if the issue is discussed without being aware of the
> > dwarfless probing that's available in SystemTap since a while ago. More
> > details at: http://sourceware.org/systemtap/wiki/MakeDoWithoutDebugInfo
> 
> Cool.
> 
> but, I feel "must asmlinkage" is too strong restriction.
> Now, ftrace can trace any function by -pg compile option and
> self modification code.
> 
> Can we do the same thing?
> I think ftrace approach have very few performance degression and
> we can apply production kernel.
>

investigate ftrace interface:
http://sources.redhat.com/bugzilla/show_bug.cgi?id=6594

Thanks,
K.Prasad