[Bug runtime/18848] New: new --monitor option

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

https://sourceware.org/bugzilla/show_bug.cgi?id=18848

            Bug ID: 18848
           Summary: new --monitor option
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: fche at redhat dot com
  Target Milestone: ---

As a part of the interactive-systemtap effort, we'd like to have a way of
compiling stap modules so that they can report on their own status, and give a
way to control them from the outside.

For example, a new option "stap --monitor" could emit extra code into the
module, so that:

- it presents a procfs interface by which stats like this are available:

  - module name, invoker uid, sizes (as per startup dmesg)
  - number of warnings, errors; maybe text of recent errors
  - list of global variables (incl. array sizes)
  - abbreviated list of probes (incl. hit count/times as per stap -t)

- it presents another procfs interface by which control may be exercised:

  - to disable or enable probes (as if by hidden on-the-fly control variables)
  - to reset the global variables (so as to start the script anew)
  - to exit the script

Then the stapio program can connect to those two proc interfaces, poll the
former to display, map keyboard inputs for sending to the other.  (The stap
--interactive front-end can later also do the same.)

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