netdev - Re: [PATCH 02/11] bpf: Compile btfid tool at kernel compilation start

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Date:   Thu, 18 Jun 2020 19:08:12 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Martin KaFai Lau <kafai@...com>,
        David Miller <davem@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Wenbo Zhang <ethercflow@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Andrii Nakryiko <andriin@...com>,
        Brendan Gregg <bgregg@...flix.com>,
        Florent Revest <revest@...omium.org>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH 02/11] bpf: Compile btfid tool at kernel compilation start

On Thu, Jun 18, 2020 at 5:47 PM Arnaldo Carvalho de Melo
<arnaldo.melo@...il.com> wrote:
>
>
>
> On June 18, 2020 9:40:32 PM GMT-03:00, Andrii Nakryiko <andrii.nakryiko@...il.com> wrote:
> >On Tue, Jun 16, 2020 at 3:06 AM Jiri Olsa <jolsa@...nel.org> wrote:
> >>
> >> The btfid tool will be used during the vmlinux linking,
> >> so it's necessary it's ready for it.
> >>
> >
> >Seeing troubles John runs into, I wonder if it maybe would be better
> >to add it to pahole instead? It's already a dependency for anything
> >BTF-related in the kernel. It has libelf, libbpf linked and set up.
> >WDYT? I've cc'ed Arnaldo as well for an opinion.
>
> I was reading this thread with a low prio, but my gut feeling was that yeah, since pahole is already there, why not have it do this?
>
> I'll try to look at this tomorrow and see if this is more than just a hunch.

I think it's better to keep it separate like Jiri did.
It is really vmlinux specific as far as I can see and can change in the future.