[RFC] New markers description without format strings

Hi,

I'll skip the implementation details, but I am considering changing the
current marker implementation, which uses format strings, for something
that would look like :

trace_mark(subsysname, eventname, mark_types(MARK_CHAR, MARK_ULLONG),
           mychar, myull);



For the curious, the preliminary proof of concept looks like the
following. It gives me a neat way to pass the types and the number of
arguments taken by the markers. Moreover, this should be more efficient
to do a switch() on the enum members than to parse the format string.

#define mark_types(args...) { args }

#define trace_mark(facname, eventname, types, args...) \
        static enum ltt_types types_##facname##_##eventname[] = types; \
        static struct ltt_types_struct struct_types_##facname##_##eventname = \
                { #facname, #eventname, types_##facname##_##eventname, \
                ARRAY_SIZE(types_##facname##_##eventname) };

Mathieu

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68