Re: [PATCH dwarves 4/4] btf: add support for split BTF loading and encoding

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On Wed, Nov 11, 2020 at 4:19 AM Arnaldo Carvalho de Melo
<acme@xxxxxxxxxx> wrote:
>
> Em Wed, Nov 11, 2020 at 08:56:27AM -0300, Arnaldo Carvalho de Melo escreveu:
> >
> > The entry for btf_encode/-J is missing, I'll add in a followup patch.
> >
> > Also I had to fixup ARGP_btf_base to 321 as I added this, to simplify
> > the kernel scripts and Makefiles:
> >
> >   $ pahole --numeric_version
> >   118
> >   $
>
> Added this:
>
> [acme@five pahole]$ git diff
> diff --git a/man-pages/pahole.1 b/man-pages/pahole.1
> index 20ee91fc911d4b39..f44c649924383a32 100644
> --- a/man-pages/pahole.1
> +++ b/man-pages/pahole.1
> @@ -181,6 +181,14 @@ the debugging information.
>  .B \-\-skip_encoding_btf_vars
>  Do not encode VARs in BTF.
>
> +.TP
> +.B \-J, \-\-btf_encode
> +Encode BTF information from DWARF, used in the Linux kernel build process when
> +CONFIG_DEBUG_INFO_BTF=y is present, introduced in Linux v5.2. Used to implement
> +features such as BPF CO-RE (Compile Once - Run Everywhere).
> +
> +See \fIhttp://vger.kernel.org/bpfconf2019_talks/bpf-core.pdf\fR.

Can you please point to [0] instead? That linked presentation is
already a bit out of date and will bitrot much faster. Blog post has
at least a chance at being updated with relevant important stuff. Plus
it has links both to the bpfconf2019 presentation, as well as some
other resources (including your presentation).

  [0] https://nakryiko.com/posts/bpf-portability-and-co-re/

> +
>  .TP
>  .B \-\-btf_encode_force
>  Ignore those symbols found invalid when encoding BTF.
> [acme@five pahole]$



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