[Feature] Help new user to identify root privilege are mandatory

[egobillot]

The exception below is often related to non-root privilege

Traceback (most recent call last):
File "./calltop.py", line 910, in
main(display)
File "./calltop.py", line 892, in main
b = create_and_load_bpf(syscall_list, latency)
File "./calltop.py", line 762, in create_and_load_bpf
b = BPF(text=prog)
File "/usr/lib/python2.7/dist-packages/bcc/init.py", line 321, in init
raise Exception("Failed to compile BPF text")
Exception: Failed to compile BPF text

Describe the solution you'd like
A more explicit message would be helpful :

It fails compiling and load the eBPF. Do you have root access ?