[RFC PATCHSET v2] Implement --switch-output-event

[Arnaldo Carvalho de Melo]

Hi guys,

	Please consider reviewing, this addresses comments by Jiri in
the V1.

	Again, the example provided is too simple, using 'perf probe' to
put probes in specific places in some workload to then get any other
event close to the time the trigger hits comes to mind as well, using
the signal was just to reuse the pre-existing logic and keep the
patchkit small.

	One other thing that occurred to me while testing is that this
can be combined with 'perf report/perf script' --switch-off option:

  $ perf report -h --switch-off

  Usage: perf report [<options>]

        --switch-off <event>
                          Stop considering events after the ocurrence of this event

  $

	To remove from consideration the events that end up being
recorded in the ring buffer after the --switch-output-event but gets in
the ring buffer because we process the --switch-output-event
asynchronously.

        Its available at:

  git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git perf/switch-output-event

Best regards,

- Arnaldo


Arnaldo Carvalho de Melo (8):
  perf record: Move sb_evlist to 'struct record'
  perf top: Move sb_evlist to 'struct perf_top'
  perf bpf: Decouple creating the evlist from adding the SB event
  perf parse-events: Add parse_events_option() variant that creates evlist
  perf evlist: Allow reusing the side band thread for more purposes
  libsubcmd: Introduce OPT_CALLBACK_SET()
  perf record: Introduce --switch-output-event
  perf record: Move side band evlist setup to separate routine

 tools/lib/subcmd/parse-options.h         |  2 +
 tools/perf/Documentation/perf-record.txt | 13 ++++
 tools/perf/builtin-record.c              | 75 ++++++++++++++++++++----
 tools/perf/builtin-top.c                 | 20 +++++--
 tools/perf/util/bpf-event.c              |  3 +-
 tools/perf/util/bpf-event.h              |  7 +--
 tools/perf/util/evlist.c                 | 39 +++++++-----
 tools/perf/util/evlist.h                 |  3 +-
 tools/perf/util/parse-events.c           | 23 ++++++++
 tools/perf/util/parse-events.h           |  1 +
 tools/perf/util/top.h                    |  2 +-
 11 files changed, 151 insertions(+), 37 deletions(-)

-- 
2.21.1