[Bug runtime/14489] New: Revamp probe metadata between modules and stapdyn

["jistone at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14489

             Bug #: 14489
           Summary: Revamp probe metadata between modules and stapdyn
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap@sourceware.org
        ReportedBy: jistone@redhat.com
            Blocks: 14178
    Classification: Unclassified


Right now, stap is generating "struct stapdu_target" information in a special
section for stapdyn to read and parse.  I'm not thrilled with the future of
having such a fixed ABI between modules and stapdyn, especially in the face of
compile-server or remote targets, where stap versions may be mismatched.

One idea is to shift this section to some self-describing textual format, which
stapdyn will read and parse.  I've experimented a little with this, but it
seems rather clunky still.

Another idea suggested by fche is for stapdyn to dlopen+dlsym the module to
query it directly for its probe information.  I like this idea, because we can
e.g. infer that a missing dlsym just means it's an older module.  I'm currently
pursuing this further.

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