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

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Message-ID: <F126D92D-E9D8-4895-AA4E-717B553AC45A@gmail.com>
Date:   Thu, 18 Jun 2020 21:47:03 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Jiri Olsa <jolsa@...nel.org>
CC:     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 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.

- Arnaldo


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