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Message-ID: <8736on1re1.fsf@manojrajarao.com>
Date: Sat, 16 Feb 2019 11:10:14 -0800
From: Manoj <linux@...ojrajarao.com>
To: Joel Fernandes <joel@...lfernandes.org>
Cc: Alexei Starovoitov <alexei.starovoitov@...il.com>,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>, ast@...nel.org,
atishp04@...il.com, dancol@...gle.com,
Dan Williams <dan.j.williams@...el.com>,
gregkh@...uxfoundation.org, Jonathan Corbet <corbet@....net>,
karim.yaghmour@...rsys.com, Kees Cook <keescook@...omium.org>,
kernel-team@...roid.com, linux-doc@...r.kernel.org,
linux-kselftest@...r.kernel.org,
Manoj Rao <linux@...ojrajarao.com>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
paulmck@...ux.vnet.ibm.com,
"Peter Zijlstra \(Intel\)" <peterz@...radead.org>,
rdunlap@...radead.org, rostedt@...dmis.org,
Shuah Khan <shuah@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>, yhs@...com
Subject: Re: [PATCH v2 1/2] Provide in-kernel headers for making it easy to extend the kernel
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@...ojrajarao.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
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