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From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc: Andrii Nakryiko <andrii@kernel.org>,
	dwarves@vger.kernel.org, bpf <bpf@vger.kernel.org>,
	Kernel Team <kernel-team@fb.com>, Jiri Olsa <jolsa@kernel.org>,
	Namhyung Kim <namhyung@kernel.org>
Subject: Re: [PATCH dwarves 4/4] btf: add support for split BTF loading and encoding
Date: Fri, 13 Nov 2020 08:35:28 -0300	[thread overview]
Message-ID: <20201113113528.GA394182@kernel.org> (raw)
In-Reply-To: <CAEf4BzajM3Pg13uTF7cKOWfASvhOPOx85ufcchuDcGLEq8d9fQ@mail.gmail.com>

Em Wed, Nov 11, 2020 at 10:29:32AM -0800, Andrii Nakryiko escreveu:
> On Wed, Nov 11, 2020 at 4:19 AM Arnaldo Carvalho de Melo
> <acme@kernel.org> 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 already a bit out of date and will bitrot much faster.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/

Done, thanks for the pinter.

- Arnaldo

  parent reply	other threads:[~2020-11-13 12:04 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-06  5:25 [PATCH dwarves 0/4] Add split BTF support to pahole Andrii Nakryiko
2020-11-06  5:25 ` [PATCH dwarves 1/4] btf_encoder: fix array index type numbering Andrii Nakryiko
2020-11-06  5:25 ` [PATCH dwarves 2/4] libbtf: improve variable naming and error reporting when writing out BTF Andrii Nakryiko
2020-11-06  5:25 ` [PATCH dwarves 3/4] libbpf: update libbpf submodlue reference to latest master Andrii Nakryiko
2020-11-06  5:25 ` [PATCH dwarves 4/4] btf: add support for split BTF loading and encoding Andrii Nakryiko
2020-11-11 11:56   ` Arnaldo Carvalho de Melo
2020-11-11 12:19     ` Arnaldo Carvalho de Melo
2020-11-11 18:29       ` Andrii Nakryiko
2020-11-11 18:32         ` Arnaldo
2020-11-13 11:35         ` Arnaldo Carvalho de Melo [this message]
2020-11-11 18:27     ` Andrii Nakryiko
2020-11-11 18:34       ` Arnaldo
2020-11-11 18:50         ` Andrii Nakryiko
2020-11-10 23:34 ` [PATCH dwarves 0/4] Add split BTF support to pahole Andrii Nakryiko
2020-11-11  0:29   ` Arnaldo
2020-11-11  0:35     ` Andrii Nakryiko
2020-11-11  0:38       ` Arnaldo

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