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tools: bpftool: add a note on program statistics in man page

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Linux kernel now supports statistics for BPF programs, and bpftool is
able to dump them. However, these statistics are not enabled by default,
and administrators may not know how to access them.

Add a paragraph in bpftool documentation, under the description of the
"bpftool prog show" command, to explain that such statistics are
available and that their collection is controlled via a dedicated sysctl
knob.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Quentin Monnet 2019-04-12 14:29:38 +01:00 committed by Daniel Borkmann
parent 88b3eed805
commit 25df480def
1 changed files with 8 additions and 0 deletions
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8
tools/bpf/bpftool/Documentation/bpftool-prog.rst
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@ -56,6 +56,14 @@ DESCRIPTION
Output will start with program ID followed by program type and
zero or more named attributes (depending on kernel version).
Since Linux 5.1 the kernel can collect statistics on BPF
programs (such as the total time spent running the program,
and the number of times it was run). If available, bpftool
shows such statistics. However, the kernel does not collect
them by defaults, as it slightly impacts performance on each
program run. Activation or deactivation of the feature is
performed via the **kernel.bpf_stats_enabled** sysctl knob.
**bpftool prog dump xlated** *PROG* [{ **file** *FILE* | **opcodes** | **visual** | **linum** }]
Dump eBPF instructions of the program from the kernel. By
default, eBPF will be disassembled and printed to standard