Demonstrations of threadsnoop, the Linux bpftrace/eBPF version.


Tracing new threads via phtread_create():

# ./threadsnoop.bt
Attaching 2 probes...
TIME                PID COMM             FUNC
10:20:31.938572   28549 dockerd          threadentry
10:20:31.939213   28549 dockerd          threadentry
10:20:31.939405   28549 dockerd          threadentry
10:20:31.940642   28549 dockerd          threadentry
10:20:31.949060   28549 dockerd          threadentry
10:20:31.958319   28549 dockerd          threadentry
10:20:31.939152   28549 dockerd          threadentry
10:20:31.950978   28549 dockerd          threadentry
10:20:32.013269   28579 docker-containe  0x562f30f2e710
10:20:32.036764   28549 dockerd          threadentry
10:20:32.083780   28579 docker-containe  0x562f30f2e710
10:20:32.116738     629 systemd-journal  0x7fb7114955c0
10:20:32.116844     629 systemd-journal  0x7fb7114955c0
[...]

The output shows a dockerd process creating several threads with the start
routine threadentry(), and docker-containe (truncated) and systemd-journal
also starting threads: in their cases, the function had no symbol information
available, so their addresses are printed in hex.