examples: add winbindd.stp and a shell script to generate it

examples: add winbindd.stp and a shell script to generate it

Usage:

  Instrument all winbindd processes:
  # stap winbindd.stp

  Instrument a specific winbindd process:
  # stap -x PID winbindd.stp

Example output:

  # stap winbindd.stp
  Collecting data, press ctrl-C to stop... ^C

  Winbind request service time
  ============================
  winbindd_getpwnam_send                   count:    99, sum:   6229 ms (min:   2669 us, avg:  62921 us, max: 157907 us)

  Winbind request runtime
  =======================
  winbindd_getpwnam_send                   count:    99, sum:      3 ms (min:     21 us, avg:     36 us, max:     77 us)

  Winbind domain-child request service time
  =========================================
  _wbint_LookupName                        count:    99, sum:   1403 ms (min:    619 us, avg:  14181 us, max: 136613 us)
  _wbint_GetNssInfo                        count:    99, sum:      0 ms (min:      2 us, avg:      3 us, max:      6 us)
  _wbint_LookupSid                         count:   102, sum:     49 ms (min:     13 us, avg:    481 us, max:   6315 us)
  _wbint_Sids2UnixIDs                      count:   101, sum:      2 ms (min:     18 us, avg:     29 us, max:     49 us)
  _wbint_LookupSids                        count:   101, sum:     84 ms (min:    411 us, avg:    838 us, max:   3524 us)

  Winbind domain-child AD-backend service time
  ============================================
  sid_to_name                              count:    56, sum:     45 ms (min:    431 us, avg:    816 us, max:   6275 us)
  sequence_number                          count:    12, sum:   1209 ms (min:  46618 us, avg: 100803 us, max: 131439 us)
  name_to_sid                              count:    99, sum:    176 ms (min:    547 us, avg:   1781 us, max:   9866 us)

  ...

Regenerate winbindd.stp:

  $ examples/systemtap/generate-winbindd.stp.sh

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Wed Jul 19 16:20:56 CEST 2017 on sn-devel-144