Discussion at Linux Foundation Japan Symposium

[KOSAKI Motohiro]

> > 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.