[Bug dyninst/14706] New: Support multiple target processes in stapdyn

[Bug dyninst/14706] New: Support multiple target processes in stapdyn

[jistone at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14706

             Bug #: 14706
           Summary: Support multiple target processes in stapdyn
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: dyninst
        AssignedTo: systemtap@sourceware.org
        ReportedBy: jistone@redhat.com
    Classification: Unclassified


We should support multiple target processes in stapdyn.  This primarily means
following fork/exec process children from the initial target, but it could also
mean allowing multiple -c/-x targets, if we want.

We'll need shared memory between targets, at least for global variables
(including per-thread stats memory, so anyone can aggregate).  Any events that
are not process specific (e.g. begin, end, timers) can run in the stapdyn
process, like they are now for the case with no target process.

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[Bug dyninst/14706] Support multiple target processes in stapdyn

[jistone at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14706

--- Comment #1 from Josh Stone <jistone at redhat dot com> 2013-01-18 02:54:30 UTC ---
There have been many commits as baby steps towards shared memory, but commit
f4d70a33 is the first that's finally running across processes.  As planned,
begin/end/timers are now running directly in stapdyn, while uprobes/utrace-like
probes run in the target process.

Next is to follow fork/exec to really have multiple process targets.

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[Bug dyninst/14706] Support multiple target processes in stapdyn

[jistone at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14706

--- Comment #2 from Josh Stone <jistone at redhat dot com> 2013-02-07 21:17:25 UTC ---
Forks should work as of commits 72100304 and 964519ac.

Exec is started in commit b9babf95, but that still has issues to work out.

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