linux-kernel - Re: [PATCH v4 1/2] Provide in-kernel headers for making it easy to extend the kernel

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Message-ID: <20190312112650.680e27c4@gandalf.local.home>
Date:   Tue, 12 Mar 2019 11:26:50 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Joel Fernandes <joel@...lfernandes.org>,
        Daniel Colascione <dancol@...gle.com>,
        Karim Yaghmour <karim.yaghmour@...rsys.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexei Starovoitov <ast@...nel.org>,
        atish patra <atishp04@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Guenter Roeck <groeck@...omium.org>,
        Jonathan Corbet <corbet@....net>,
        Kees Cook <keescook@...omium.org>,
        Android Kernel Team <kernel-team@...roid.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        linux-trace-devel@...r.kernel.org,
        Manoj Rao <linux@...ojrajarao.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Qais Yousef <qais.yousef@....com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Shuah Khan <shuah@...nel.org>, Yonghong Song <yhs@...com>
Subject: Re: [PATCH v4 1/2] Provide in-kernel headers for making it easy to
 extend the kernel

On Mon, 11 Mar 2019 18:45:24 -0700
Alexei Starovoitov <alexei.starovoitov@...il.com> wrote:

> what you're asking for we already have. It's called BTF.

Cool.

> pahole takes vmlinux dwarf and convert it into ~1Mbyte of BTF that includes
> all kernel types.
> With gzip it can be compressed further if necessary.
> We also have a prototype to generate all_vmlinux_types.h from BTF.
> But it's not a substitute for kernel headers.
> We've had a long discussion during last LPC regarding this:
> http://vger.kernel.org/lpc-bpf2018.html#session-2
> tldr: many tracing use cases will be solved with BTF, but kernel headers
> are here to stay.

Is this work a result of that session? (I was only able to attend part
of the BPF sessions due to conflicts). I guess I should watch the
videos.

-- Steve