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![Ye Olde BPF
# tcpdump host 127.0.0.1 and port 22 -d
(000) ldh [12]
(001) jeq #0x800 jt 2 jf 18
(002) ld [26]
(003) jeq #0...](https://image.slidesharecdn.com/lisa2016bpftools169-161209002318/75/Linux-4-x-Tracing-Tools-Using-BPF-Superpowers-19-2048.jpg?cb=1666072978)
![12. profile
# profile
Sampling at 49 Hertz of all threads by user + kernel stack... Hit Ctrl-C to end.
^C
[…]
ffffffff813d...](https://image.slidesharecdn.com/lisa2016bpftools169-161209002318/75/Linux-4-x-Tracing-Tools-Using-BPF-Superpowers-46-2048.jpg?cb=1666072978)
![argdist
# argdist -H 'p::tcp_cleanup_rbuf(struct sock *sk, int copied):int:copied'
[15:34:45]
copied : count distribution...](https://image.slidesharecdn.com/lisa2016bpftools169-161209002318/75/Linux-4-x-Tracing-Tools-Using-BPF-Superpowers-50-2048.jpg?cb=1666072978)
