Why does $$parms show value as "?"

[Frank Ch. Eigler]

grant.b.edwards wrote:

> [...]
>> and that should keep all variables around for your
>> perusal.  Or it may be enough just to mark that function noinline.
>
> Declaring the function with the "noinline" keyword fixed the problem,
> but turning down optimization is probably going to be needed as well
> for other probes.

See also http://sourceware.org/systemtap/wiki/TipContextVariables
and https://bugzilla.redhat.com/show_bug.cgi?id=677681

- FChE