linux-kernel - Re: [PATCH v3 1/2] libbpf: add support for printing BTF character arrays as strings

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Message-ID: <CAP_z_Cgo0mLn6+cObVSBu4dY2SZaDTO6HZ-0D=1uAhuoc+jQRQ@mail.gmail.com>
Date: Wed, 11 Jun 2025 10:20:38 -0700
From: Blake Jones <blakejones@...gle.com>
To: Jiri Olsa <olsajiri@...il.com>
Cc: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	Andrii Nakryiko <andrii@...nel.org>, Martin KaFai Lau <martin.lau@...ux.dev>, 
	Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>, 
	Yonghong Song <yonghong.song@...ux.dev>, John Fastabend <john.fastabend@...il.com>, 
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>, 
	Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>, 
	Ihor Solodrai <ihor.solodrai@...ux.dev>, Namhyung Kim <namhyung@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, bpf@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v3 1/2] libbpf: add support for printing BTF character
 arrays as strings

Hi Jiri,

On Wed, Jun 11, 2025 at 3:34 AM Jiri Olsa <olsajiri@...il.com> wrote:
> could this be used in bpftool map dump? ;-) I checked, but it looks like
> bpftool map dump is using something else to dump data.. I admit I haven't
> spent much on time that

I actually started this work by looking at bpftool's dumper, and only
after a bit of time did I realize that there was a more general dumper
in libbpf. I suspect that part of why no one has updated bpftool to
use libbpf for this is that bpftool's dumper also has a "display in
JSON" mode which libbpf doesn't support. So yes, it could be done, but
it would take some work.

Blake