• Steven Rostedt's avatar
    powerpc64: port of the function graph tracer · 6794c782
    Steven Rostedt authored
    This is a port of the function graph tracer that was written by
    Frederic Weisbecker for the x86.
    
    This only works for PPC64 at the moment and only for static tracing.
    PPC32 and dynamic function graph tracing support will come later.
    
    The trace produces a visual calling of functions:
    
     # tracer: function_graph
     #
     # CPU  DURATION                  FUNCTION CALLS
     # |     |   |                     |   |   |   |
      0)   2.224 us    |                        }
      0) ! 271.024 us  |                      }
      0) ! 320.080 us  |                    }
      0) ! 324.656 us  |                  }
      0) ! 329.136 us  |                }
      0)               |                .put_prev_task_fair() {
      0)               |                  .update_curr() {
      0)   2.240 us    |                    .update_min_vruntime();
      0)   6.512 us    |                  }
      0)   2.528 us    |                  .__enqueue_entity();
      0) + 15.536 us   |                }
      0)               |                .pick_next_task_fair() {
      0)   2.032 us    |                  .__pick_next_entity();
      0)   2.064 us    |                  .__clear_buddies();
      0)               |                  .set_next_entity() {
      0)   2.672 us    |                    .__dequeue_entity();
      0)   6.864 us    |                  }
    
    Geoff Lavand tested on PS3.
    Tested-by: default avatarGeoff Levand <geoffrey.levand@am.sony.com>
    Acked-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    6794c782
process.c 27.5 KB