Running chapter2/hello-tail.py clutters the console

[simplyatul]

On running hello-tail.py program, continuous prints on the console are observed. This makes it difficult to check expected log prints (like bpf_trace_printk("Executing a program");)

Here is the snap of the console

b'            sudo-2258    [001] .....  4624.922468: bpf_trace_printk: Another syscall: 13'
b'            sudo-2258    [001] .....  4624.922469: bpf_trace_printk: Another syscall: 14'
b'            sudo-2258    [001] .....  4624.922470: bpf_trace_printk: Another syscall: 14'
b'CPU:0 [LOST 113 EVENTS]'
b'   hello-tail.py-2260    [000] .....  4624.922512: bpf_trace_printk: Another syscall: 1'
b'   hello-tail.py-2260    [000] .....  4624.922521: bpf_trace_printk: Another syscall: 1'
b'   hello-tail.py-2260    [000] .....  4624.922525: bpf_trace_printk: Another syscall: 1'
b'            sudo-2258    [001] .....  4624.922526: bpf_trace_printk: Another syscall: 271'
b'   hello-tail.py-2260    [000] .....  4624.922534: bpf_trace_printk: Another syscall: 1'
b'   hello-tail.py-2260    [000] .....  4624.922538: bpf_trace_printk: Another syscall: 1'
b'            sudo-2258    [001] .....  4624.922540: bpf_trace_printk: Another syscall: 13'
b'            sudo-2258    [001] .....  4624.922541: bpf_trace_printk: Another syscall: 0'
b'   hello-tail.py-2260    [000] .....  4624.922547: bpf_trace_printk: Another syscall: 1'
b'   hello-tail.py-2260    [000] .....  4624.922551: bpf_trace_printk: Another syscall: 1'
b'   hello-tail.py-2260    [000] .....  4624.922560: bpf_trace_printk: Another syscall: 1'
b'   hello-tail.py-2260    [000] .....  4624.922563: bpf_trace_printk: Another syscall: 0'
b'            sudo-2258    [001] .....  4624.922565: bpf_trace_printk: Another syscall: 13'
b'            sudo-2258    [001] .....  4624.922567: bpf_trace_printk: Another syscall: 14'
b'            sudo-2258    [001] .....  4624.922568: bpf_trace_printk: Another syscall: 14'
b'            sudo-2258    [001] .....  4624.922569: bpf_trace_printk: Another syscall: 271'
b'            sudo-2258    [001] .....  4624.922572: bpf_trace_printk: Another syscall: 13'
b'            sudo-2258    [001] .....  4624.922573: bpf_trace_printk: Another syscall: 0'
b'            sudo-2258    [001] .....  4624.922575: bpf_trace_printk: Another syscall: 13'
b'            sudo-2258    [001] .....  4624.922576: bpf_trace_printk: Another syscall: 14'
b'            sudo-2258    [001] .....  4624.922577: bpf_trace_printk: Another syscall: 14'
b'            sudo-2258    [001] .....  4624.922578: bpf_trace_printk: Another syscall: 271'
b'    tmux: server-1470    [001] .....  4624.922604: bpf_trace_printk: Another syscall: 7'
b'    tmux: server-1470    [001] .....  4624.922607: bpf_trace_printk: Another syscall: 16'
b'    tmux: server-1470    [001] .....  4624.922608: bpf_trace_printk: Another syscall: 19'
b'            sudo-2258    [001] .....  4624.922625: bpf_trace_printk: Another syscall: 13'
b'            sudo-2258    [001] .....  4624.922626: bpf_trace_printk: Another syscall: 1'
b'            sudo-2258    [001] .....  4624.922637: bpf_trace_printk: Another syscall: 13'
b'            sudo-2258    [001] .....  4624.922638: bpf_trace_printk: Another syscall: 271'
b'   hello-tail.py-2260    [000] .....  4624.922639: bpf_trace_printk: Another syscall: 1'
b'   hello-tail.py-2260    [000] .....  4624.922649: bpf_trace_printk: Another syscall: 1'
b'   hello-tail.py-2260    [000] .....  4624.922652: bpf_trace_printk: Another syscall: 1'
b'            sudo-2258    [001] .....  4624.922656: bpf_trace_printk: Another syscall: 13'
b'   hello-tail.py-2260    [000] .....  4624.922662: bpf_trace_printk: Another syscall: 1'
b'            sudo-2258    [001] .....  4624.922665: bpf_trace_printk: Another syscall: 0'
b'   hello-tail.py-2260    [000] .....  4624.922665: bpf_trace_printk: Another syscall: 1'
b'            sudo-2258    [001] .....  4624.922667: bpf_trace_printk: Another syscall: 13'
b'            sudo-2258    [001] .....  4624.922668: bpf_trace_printk: Another syscall: 14'
b'   hello-tail.py-2260    [000] .....  4624.922675: bpf_trace_printk: Another syscall: 1'
b'   hello-tail.py-2260    [000] .....  4624.922679: bpf_trace_printk: Another syscall: 1'
b'            sudo-2258    [001] .....  4624.922680: bpf_trace_printk: Another syscall: 14'
b'            sudo-2258    [001] .....  4624.922681: bpf_trace_printk: Another syscall: 271'

I have made few simple changes to correct this behavior. I will attach the PR.