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From:   Manoj <linux@manojrajarao.com>
To:     Joel Fernandes <joel@joelfernandes.org>
Cc:     Alexei Starovoitov <alexei.starovoitov@gmail.com>,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        Andrew Morton <akpm@linux-foundation.org>, ast@kernel.org,
        atishp04@gmail.com, dancol@google.com,
        Dan Williams <dan.j.williams@intel.com>,
        gregkh@linuxfoundation.org, Jonathan Corbet <corbet@lwn.net>,
        karim.yaghmour@opersys.com, Kees Cook <keescook@chromium.org>,
        kernel-team@android.com, linux-doc@vger.kernel.org,
        linux-kselftest@vger.kernel.org,
        Manoj Rao <linux@manojrajarao.com>,
        Masahiro Yamada <yamada.masahiro@socionext.com>,
        paulmck@linux.vnet.ibm.com,
        "Peter Zijlstra \(Intel\)" <peterz@infradead.org>,
        rdunlap@infradead.org, rostedt@goodmis.org,
        Shuah Khan <shuah@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>, yhs@fb.com
Subject: Re: [PATCH v2 1/2] Provide in-kernel headers for making it easy to extend the kernel
In-reply-to: <20190215034720.GA230433@google.com>
Date:   Sat, 16 Feb 2019 11:10:14 -0800
Message-ID: <8736on1re1.fsf@manojrajarao.com>
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Joel Fernandes writes:

> On Thu, Feb 14, 2019 at 07:19:29PM -0800, Alexei Starovoitov wrote:
>> On Mon, Feb 11, 2019 at 09:35:59AM -0500, Joel Fernandes (Google) wrote:
>> > Introduce in-kernel headers and other artifacts which are made available
>> > as an archive through proc (/proc/kheaders.txz file). This archive makes
>> > it possible to build kernel modules, run eBPF programs, and other
>> > tracing programs that need to extend the kernel for tracing purposes
>> > without any dependency on the file system having headers and build
>> > artifacts.
>> > 
>> > On Android and embedded systems, it is common to switch kernels but not
>> > have kernel headers available on the file system. Raw kernel headers
>> > also cannot be copied into the filesystem like they can be on other
>> > distros, due to licensing and other issues. There's no linux-headers
>> > package on Android. Further once a different kernel is booted, any
>> > headers stored on the file system will no longer be useful. By storing
>> > the headers as a compressed archive within the kernel, we can avoid these
>> > issues that have been a hindrance for a long time.
>> 
>> The set looks good to me and since the main use case is building bpf progs
>> I can route it via bpf-next tree if there are no objections.
>> Masahiro, could you please ack it?
>> 
>
> Yes, eBPF is one of the usecases. After this, I am also planning to send
> patches to BCC so that it can use this feature when compiling C to eBPF.
>

Tested-by: Manoj Rao <linux@manojrajarao.com>

I think this can definitely make it easier to use eBPF on
Android. Thanks for initiating this.

> Thanks!
>
>  - Joel


-- 
Manoj
http://www.mycpu.org