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![Ye Olde BPF
Berkeley Packet Filter
# tcpdump host 127.0.0.1 and port 22 -d
(000) ldh [12]
(001) jeq #0x800 jt 2 jf 18
(0...](https://image.slidesharecdn.com/velocity2017bpfsuperpowers-170622233822/75/Velocity-2017-Performance-analysis-superpowers-with-Linux-eBPF-11-2048.jpg?cb=1665846860)
![ply programs are concise, such as measuring read latency
# ply -A -c 'kprobe:SyS_read { @start[tid()] = nsecs(); }
kretpr...](https://image.slidesharecdn.com/velocity2017bpfsuperpowers-170622233822/75/Velocity-2017-Performance-analysis-superpowers-with-Linux-eBPF-51-2048.jpg?cb=1665846860)
