perf ftrace: Add 'tail' option to --graph-opts

The 'graph-tail' option is to print function name as a comment at the end.
This is useful when a large function is mixed with other functions
(possibly from different CPUs).

For example,

  $ sudo perf ftrace -- perf stat true
  ...
   1)               |    get_unused_fd_flags() {
   1)               |      alloc_fd() {
   1)   0.178 us    |        _raw_spin_lock();
   1)   0.187 us    |        expand_files();
   1)   0.169 us    |        _raw_spin_unlock();
   1)   1.211 us    |      }
   1)   1.503 us    |    }

  $ sudo perf ftrace --graph-opts tail -- perf stat true
  ...
   1)               |    get_unused_fd_flags() {
   1)               |      alloc_fd() {
   1)   0.099 us    |        _raw_spin_lock();
   1)   0.083 us    |        expand_files();
   1)   0.081 us    |        _raw_spin_unlock();
   1)   0.601 us    |      } /* alloc_fd */
   1)   0.751 us    |    } /* get_unused_fd_flags */

Reviewed-by: Ian Rogers <[email protected]>
Signed-off-by: Namhyung Kim <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Changbin Du <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Steven Rostedt (VMware) <[email protected]>
Link: https://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

0 files changed, 0 insertions, 0 deletions