gistfile1.txt

# observe.py
from bcc import BPF
BPF(text='
int kprobe__tcp_conn_request(struct request_sock_ops *rsk_ops, 
  const struct tcp_request_sock_ops *af_ops, 
  struct sock *sk, 
  struct sk_buff *skb) { 
  bpf_trace_printk("qlen: *sock.sk_ack_backlog"); 
  return 0; 
}').trace_print()