[Bug uprobes/13663] New: automate sdt semaphores

[jistone at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13663

             Bug #: 13663
           Summary: automate sdt semaphores
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: uprobes
        AssignedTo: systemtap@sourceware.org
        ReportedBy: jistone@redhat.com
    Classification: Unclassified


A few months ago, we had some discussion about SDT probes automatically dealing
with semaphores in the app itself.  See this thread:

  http://sourceware.org/ml/systemtap/2011-q3/msg00388.html

In such a design, there wouldn't really be a semaphore counter at all.  The
ENABLED() macro would basically be a predicate on whether the probe IP has been
modified from a nop to a debug trap.  But do read that message thread for some
anticipated complications.

Hopefully we could do this without any change to the SDT ABI.  To consumers, it
would just look like a probe point without any semaphore.

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