[Bug kprobes/2666] New: List active probes

["jkenisto at us dot ibm dot com" <sourceware-bugzilla at sourceware dot org>]

It has been requested that we provide the ability to list all probes that are
currently active in the system.  This could presumably be done either via /proc
or by adding a function to the kprobes API.

If we did it via /proc, the listing might look something like this:
k  c0151ece do_pipe+0x177/0x1d1
r  c01105f6 do_fork
j  c01105f6 do_fork

This would indicate that there's a kprobe somewhere in do_pipe, and a return
probe and a jprobe on do_fork.

Should we include the handlers' addresses?

Presumably, such a function would iterate through the kprobe_table[] and spit
out the probes in whatever order it finds them.  Don't forget about aggregate
probes.  A jprobe is a kprobe with a break_handler.  A kretprobe is a kprobe
with pre_handler=pre_handler_kretprobe.

The implementation should take into account the possibility of user-space
probes, user-space return probes, and watchpoint probes (kernel & user).

-- 
           Summary: List active probes
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: enhancement
          Priority: P3
         Component: kprobes
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: jkenisto at us dot ibm dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=2666

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