diff options
| author | Andrii Nakryiko <andriin@fb.com> | 2020-06-19 16:17:03 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-06-22 17:01:49 -0700 |
| commit | 075c776658190681d2bf9997306f871d6c8a9b36 (patch) | |
| tree | 4f2cf6abf36ea9c8a85be8b1164976ca5320ae0e /tools/bpf/bpftool/Documentation/bpftool-link.rst | |
| parent | d53dee3fe0138610fcce5721bae9414377c41ec3 (diff) | |
tools/bpftool: Add documentation and sample output for process info
Add statements about bpftool being able to discover process info, holding
reference to BPF map, prog, link, or BTF. Show example output as well.
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/bpf/20200619231703.738941-10-andriin@fb.com
Diffstat (limited to 'tools/bpf/bpftool/Documentation/bpftool-link.rst')
| -rw-r--r-- | tools/bpf/bpftool/Documentation/bpftool-link.rst | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/tools/bpf/bpftool/Documentation/bpftool-link.rst b/tools/bpf/bpftool/Documentation/bpftool-link.rst index 0e43d7b06c11..38b0949a185b 100644 --- a/tools/bpf/bpftool/Documentation/bpftool-link.rst +++ b/tools/bpf/bpftool/Documentation/bpftool-link.rst @@ -37,6 +37,11 @@ DESCRIPTION zero or more named attributes, some of which depend on type of link. + Since Linux 5.8 bpftool is able to discover information about + processes that hold open file descriptors (FDs) against BPF + links. On such kernels bpftool will automatically emit this + information as well. + **bpftool link pin** *LINK* *FILE* Pin link *LINK* as *FILE*. @@ -82,6 +87,7 @@ EXAMPLES 10: cgroup prog 25 cgroup_id 614 attach_type egress + pids test_progs(223) **# bpftool --json --pretty link show** @@ -91,7 +97,12 @@ EXAMPLES "type": "cgroup", "prog_id": 25, "cgroup_id": 614, - "attach_type": "egress" + "attach_type": "egress", + "pids": [{ + "pid": 223, + "comm": "test_progs" + } + ] } ] |