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libbpf: Configure log verbosity with env variable

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Configure logging verbosity by setting LIBBPF_LOG_LEVEL environment
variable, which is applied only to default logger. Once user set their
custom logging callback, it is up to them to handle filtering.

Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240524131840.114289-1-yatsenko@meta.com
This commit is contained in:
Mykyta Yatsenko
2024-05-24 14:18:40 +01:00
committed by Andrii Nakryiko
parent 0babfb126a
commit d4d3e68e8d
3 changed files with 36 additions and 2 deletions
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8
docs/libbpf_overview.rst
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@@ -219,6 +219,14 @@ compilation and skeleton generation. Using Libbpf-rs will make building user
space part of the BPF application easier. Note that the BPF program themselves
must still be written in plain C.
libbpf logging
==============
By default, libbpf logs informational and warning messages to stderr. The
verbosity of these messages can be controlled by setting the environment
variable LIBBPF_LOG_LEVEL to either warn, info, or debug. A custom log
callback can be set using ``libbpf_set_print()``.
Additional Documentation
========================