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


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#!/usr/bin/env ktap

#kernel function profile
#You can use this script to know what function is called frequently,
#without enable CONFIG_FUNCTION_PROFILER in kernel.

s = aggr_table()

trace ftrace:function {
	s[arg1] = count()
}

trace_end {
	histogram(s)
}

#sample output
#^C
#                          value ------------- Distribution ------------- count
#               sub_preempt_count | @@@@@                                  34904
#               add_preempt_count | @@@@@                                  33435
#              nsecs_to_jiffies64 | @@@                                    19919
# irqtime_account_process_tick... | @                                      9970
#               account_idle_time | @                                      9880
#                  _raw_spin_lock |                                        5100
#                _raw_spin_unlock |                                        5021
#     _raw_spin_unlock_irqrestore |                                        4235
#          _raw_spin_lock_irqsave |                                        4232
#                 __rcu_read_lock |                                        3373
#               __rcu_read_unlock |                                        3373
#                  lookup_address |                                        2392
#             pfn_range_is_mapped |                                        2384
#      update_cfs_rq_blocked_load |                                        1983
#                        idle_cpu |                                        1808
#                       ktime_get |                                        1394
#            _raw_spin_unlock_irq |                                        1270
#              _raw_spin_lock_irq |                                        1091
#                     update_curr |                                        950
#             irqtime_account_irq |                                        950
#                             ... |
#