We have a bunch of libbpf tools require features like fentry / tp_btf which only available on kernel v5.5+.
Running these tools on old kernels result in EINVAL. Instead of error out, we can fallback to kprobe.
Open this ticket to keep track of this process:

• biolatency
• biosnoop
• biostacks
• bitesize
• cachestat
• cpudist
• cpufreq
• drsnoop
• hardirqs
• mdflush
• numamove
• offcputime
• readahead
• softirqs

If you are interested, please feel free to pick it up.