ftrace: Fix function_graph duration spacing with 7-digits

Jungseok Lee noticed the following:

Currently, row's width of 7-digit duration numbers not aligned with
other cases like the following example.

 3) $ 3999884 us |      }
 3)               |      finish_task_switch() {
 3)   0.365 us    |        _raw_spin_unlock_irq();
 3)   3.333 us    |      }
 3) $ 3999976 us |    }
 3) $ 3999979 us |  } /* schedule */

As adding a single white space in case of 7-digit numbers, the format
could be unified easily as follows.

 3) $ 2237472 us  |      }
 3)               |      finish_task_switch() {
 3)   0.364 us    |        _raw_spin_unlock_irq();
 3)   3.125 us    |      }
 3) $ 2237556 us  |    }
 3) $ 2237559 us  |  } /* schedule */

Instead of making a special case for 7-digit numbers, the logic
of the len and the space loop is slightly modified to make the
two cases have the same format.

Link: http://lkml.kernel.org/r/1436626300-1679-2-git-send-email-jungseoklee85@gmail.com
Reported-by: Jungseok Lee <jungseoklee85@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 8968bf720c1259387ba2f6413dbdda026671ada8..ca98445782acaa83915a5ffb653a189bed1705b1 100644 (file)
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -715,13 +715,13 @@ trace_print_graph_duration(unsigned long long duration, struct trace_seq *s)
 
                snprintf(nsecs_str, slen, "%03lu", nsecs_rem);
                trace_seq_printf(s, ".%s", nsecs_str);
-               len += strlen(nsecs_str);
+               len += strlen(nsecs_str) + 1;
        }
 
        trace_seq_puts(s, " us ");
 
        /* Print remaining spaces to fit the row's width */
-       for (i = len; i < 7; i++)
+       for (i = len; i < 8; i++)
                trace_seq_putc(s, ' ');
 }