drivers/staging/ktap/samples/profiling/function_profiler.kp

   1 #!/usr/bin/env ktap
   2
   3 #kernel function profile
   4 #You can use this script to know what function is called frequently,
   5 #without enable CONFIG_FUNCTION_PROFILER in kernel.
   6
   7 s = ptable()
   8
   9 trace ftrace:function {
  10         s[arg1] <<< 1
  11 }
  12
  13 trace_end {
  14         histogram(s)
  15 }
  16
  17 #sample output
  18 #^C
  19 #                          value ------------- Distribution ------------- count
  20 #               sub_preempt_count | @@@@@                                  34904
  21 #               add_preempt_count | @@@@@                                  33435
  22 #              nsecs_to_jiffies64 | @@@                                    19919
  23 # irqtime_account_process_tick... | @                                      9970
  24 #               account_idle_time | @                                      9880
  25 #                  _raw_spin_lock |                                        5100
  26 #                _raw_spin_unlock |                                        5021
  27 #     _raw_spin_unlock_irqrestore |                                        4235
  28 #          _raw_spin_lock_irqsave |                                        4232
  29 #                 __rcu_read_lock |                                        3373
  30 #               __rcu_read_unlock |                                        3373
  31 #                  lookup_address |                                        2392
  32 #             pfn_range_is_mapped |                                        2384
  33 #      update_cfs_rq_blocked_load |                                        1983
  34 #                        idle_cpu |                                        1808
  35 #                       ktime_get |                                        1394
  36 #            _raw_spin_unlock_irq |                                        1270
  37 #              _raw_spin_lock_irq |                                        1091
  38 #                     update_curr |                                        950
  39 #             irqtime_account_irq |                                        950
  40 #                             ... |
  41 #