perf script: Allow specifying event to switch off processing of other events

Counterpart of --switch-on:

  # perf record -e sched:*,syscalls:sys_*_nanosleep sleep 1
  [ perf record: Woken up 36 times to write data ]
  [ perf record: Captured and wrote 0.032 MB perf.data (10 samples) ]
  #
  # perf script
      :20918 20918 [002] 109866.143696:            sched:sched_waking: comm=perf pid=20919 prio=120 target_cpu=001
      :20918 20918 [002] 109866.143702:            sched:sched_wakeup: perf:20919 [120] success=1 CPU:001
       sleep 20919 [001] 109866.144081:      sched:sched_process_exec: filename=/usr/bin/sleep pid=20919 old_pid=20919
       sleep 20919 [001] 109866.144408:  syscalls:sys_enter_nanosleep: rqtp: 0x7ffc2384fef0, rmtp: 0x00000000
       sleep 20919 [001] 109866.144411:      sched:sched_stat_runtime: comm=sleep pid=20919 runtime=521249 [ns] vruntime=202919398131 [n>
       sleep 20919 [001] 109866.144412:            sched:sched_switch: sleep:20919 [120] S ==> swapper/1:0 [120]
     swapper     0 [001] 109867.144568:            sched:sched_waking: comm=sleep pid=20919 prio=120 target_cpu=001
     swapper     0 [001] 109867.144586:            sched:sched_wakeup: sleep:20919 [120] success=1 CPU:001
       sleep 20919 [001] 109867.144614:   syscalls:sys_exit_nanosleep: 0x0
       sleep 20919 [001] 109867.144753:      sched:sched_process_exit: comm=sleep pid=20919 prio=120
  #
  # perf script --switch-off syscalls:sys_exit_nanosleep
      :20918 20918 [002] 109866.143696:            sched:sched_waking: comm=perf pid=20919 prio=120 target_cpu=001
      :20918 20918 [002] 109866.143702:            sched:sched_wakeup: perf:20919 [120] success=1 CPU:001
       sleep 20919 [001] 109866.144081:      sched:sched_process_exec: filename=/usr/bin/sleep pid=20919 old_pid=20919
       sleep 20919 [001] 109866.144408:  syscalls:sys_enter_nanosleep: rqtp: 0x7ffc2384fef0, rmtp: 0x00000000
       sleep 20919 [001] 109866.144411:      sched:sched_stat_runtime: comm=sleep pid=20919 runtime=521249 [ns] vruntime=202919398131 [n>
       sleep 20919 [001] 109866.144412:            sched:sched_switch: sleep:20919 [120] S ==> swapper/1:0 [120]
     swapper     0 [001] 109867.144568:            sched:sched_waking: comm=sleep pid=20919 prio=120 target_cpu=001
     swapper     0 [001] 109867.144586:            sched:sched_wakeup: sleep:20919 [120] success=1 CPU:001
       sleep 20919 [001] 109867.144753:      sched:sched_process_exit: comm=sleep pid=20919 prio=120
  #
  # perf script --switch-on syscalls:sys_enter_nanosleep --switch-off syscalls:sys_exit_nanosleep
       sleep 20919 [001] 109866.144411:      sched:sched_stat_runtime: comm=sleep pid=20919 runtime=521249 [ns] vruntime=202919398131 [n>
       sleep 20919 [001] 109866.144412:            sched:sched_switch: sleep:20919 [120] S ==> swapper/1:0 [120]
     swapper     0 [001] 109867.144568:            sched:sched_waking: comm=sleep pid=20919 prio=120 target_cpu=001
     swapper     0 [001] 109867.144586:            sched:sched_wakeup: sleep:20919 [120] success=1 CPU:001
  #
  # perf script --switch-on syscalls:sys_enter_nanosleep --switch-off syscalls:sys_exit_nanosleep --show-on-off
       sleep 20919 [001] 109866.144408:  syscalls:sys_enter_nanosleep: rqtp: 0x7ffc2384fef0, rmtp: 0x00000000
       sleep 20919 [001] 109866.144411:      sched:sched_stat_runtime: comm=sleep pid=20919 runtime=521249 [ns] vruntime=202919398131 [n>
       sleep 20919 [001] 109866.144412:            sched:sched_switch: sleep:20919 [120] S ==> swapper/1:0 [120]
     swapper     0 [001] 109867.144568:            sched:sched_waking: comm=sleep pid=20919 prio=120 target_cpu=001
     swapper     0 [001] 109867.144586:            sched:sched_wakeup: sleep:20919 [120] success=1 CPU:001
       sleep 20919 [001] 109867.144614:   syscalls:sys_exit_nanosleep: 0x0
  #

Now think about using this together with 'perf probe' to create custom on/off
events in your app :-)

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: William Cohen <wcohen@redhat.com>
Link: https://lkml.kernel.org/n/tip-li3j01c4tmj9kw6ydsl8swej@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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