• Steven Rostedt's avatar
    tracing: adding function timings to function profiler · 0706f1c4
    Steven Rostedt authored
    
    
    If the function graph trace is enabled, the function profiler will
    use it to take the timing of the functions.
    
     cat /debug/tracing/trace_stat/functions
    
      Function                               Hit    Time
      --------                               ---    ----
      mwait_idle                             127    183028.4 us
      schedule                                26    151997.7 us
      __schedule                              31    151975.1 us
      sys_wait4                                2    74080.53 us
      do_wait                                  2    74077.80 us
      sys_newlstat                           138    39929.16 us
      do_path_lookup                         179    39845.79 us
      vfs_lstat_fd                           138    39761.97 us
      user_path_at                           153    39469.58 us
      path_walk                              179    39435.76 us
      __link_path_walk                       189    39143.73 us
    [...]
    
    Note the times are skewed due to the function graph tracer not taking
    into account schedules.
    Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
    0706f1c4