Linux Observability with BPF by David Calavera

Author:David Calavera
Language: eng
Format: epub
Publisher: O'Reilly Media
Published: 2019-10-14T16:00:00+00:00

# bpftool prog show 52: cgroup_skb tag 7be49e3934a125ba loaded_at 2019-03-28T16:46:04-0700 uid 0 xlated 296B jited 229B memlock 4096B map_ids 52,53 53: cgroup_skb tag 2a142ef67aaad174 loaded_at 2019-03-28T16:46:04-0700 uid 0 xlated 296B jited 229B memlock 4096B map_ids 52,53 54: cgroup_skb tag 7be49e3934a125ba loaded_at 2019-03-28T16:46:04-0700 uid 0 xlated 296B jited 229B memlock 4096B map_ids 54,55 60: perf_event name bpf_prog tag c6e8e35bea53af79 loaded_at 2019-03-28T20:46:32-0700 uid 0 xlated 112B jited 115B memlock 4096B

As you can see, BPFTool gives you a lot of information about the programs loaded in your kernel without having to write and compile any code. Let’s see how to work with BPF maps next.

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