#!/usr/bin/env stap 
#
# This script continuously lists the top 20 systemcalls on the system
#

global syscalls

function print_top () {
	printf ("SYSCALL\t\t\t\tCOUNT\n")
	foreach ([name] in syscalls- limit 20)
		printf("%-20s\t\t%5d\n",name, syscalls[name])
	printf("--------------------------------------\n")
	delete syscalls
}

probe kernel.function("sys_*") {
	syscalls[probefunc()]++
}

# print top syscalls every 5 seconds
probe timer.ms(5000) {
	print_top ()
}