#! /usr/bin/stap --bpf

global arr

probe kernel.function("ksys_read") !, kernel.function("vfs_read") {
    arr[0]++;
}

probe kernel.function("ksys_write") !, kernel.function("vfs_write") {
    arr[1]++;
}

probe prometheus {

    $value .= ("count{syscall=\"ksys_read\"} " . sprint(arr[0]) . "\n")
    $value .= ("count{syscall=\"ksys_write\"} " . sprint(arr[1]) . "\n")

}