netdev - Re: [PATCH bpf-next v5 00/10] BTF: BPF Type Format

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Message-ID: <20180607140337.GF30317@kernel.org>
Date:   Thu, 7 Jun 2018 11:03:37 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Martin KaFai Lau <kafai@...com>
Cc:     netdev@...r.kernel.org, Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>, kernel-team@...com
Subject: Re: [PATCH bpf-next v5 00/10] BTF: BPF Type Format

Em Thu, Jun 07, 2018 at 10:54:01AM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Tue, Jun 05, 2018 at 02:25:48PM -0700, Martin KaFai Lau escreveu:
> > [ btw, the latest commit (1 commit) should be 94a11b59e592 ].

So, the commit log message for the pahole patch is non-existent:

https://github.com/iamkafai/pahole/commit/94a11b59e5920908085bfc8d24c92f95c8ffceaf

we should do better in describing what is done and how, I'm staring
with a message you sent to the kernel part:

--
This patch introduces BPF Type Format (BTF).

BTF (BPF Type Format) is the meta data format which describes
the data types of BPF program/map.  Hence, it basically focus
on the C programming language which the modern BPF is primary
using.  The first use case is to provide a generic pretty print
capability for a BPF map.
--

Now I'm going to do the step-by-step guide on testing the feature just
introduced, and will try to convert from dwarf to BTF and back, compare
the pahole output for types encoded in DWARF and BTF, etc.

If you have something ressembling this already, please share.

Thanks,

- Arnaldo