Debugging Linux Kernel using SystemTap Part-8 - Find top 10 system calls executed every 5 seconds

In this post, we will write a system tap script to find out the top 10 system calls being executed in your Linux Machine every 5 seconds.

# This script continuously lists the top 10 system calls in the
# 5 second interval

global syscalls_count

probe syscall.* {
    syscalls_count[name]++
}

function print_sysstop() {
    printf("%25s %10s \n", "SYSCALL", "COUNT")
    foreach(syscall in syscalls_count- limit 10) {
        printf("%25s %10d\n", syscall, syscalls_count[syscall])
    }
    delete syscalls_count
}

probe timer.s(5) {
    print_sysstop()
    printf("---------------------------------------------------------------\n")
}

Notes:

1. We declared a global array named syscalls_count 

2. We have probed for all the system calls using "probe syscall.*", once the system call is probed its count is incremented

3. We are using timer with 5 second interval to print the results

O/P: