linux-kernel - Re: [PATCH net] bpf: split eBPF out of NET

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Message-ID: <CAMEtUux7q93hD7xr+DUDk3btYR+A7NXEMcu6YVWAHSNuLUhNJA@mail.gmail.com>
Date:	Mon, 27 Oct 2014 17:18:36 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	David Miller <davem@...emloft.net>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Josh Triplett <josh@...htriplett.org>,
	Ingo Molnar <mingo@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Daniel Borkmann <dborkman@...hat.com>,
	Network Development <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] bpf: split eBPF out of NET

On Mon, Oct 27, 2014 at 4:10 PM, David Miller <davem@...emloft.net> wrote:
> From: Alexei Starovoitov <ast@...mgrid.com>
> Date: Thu, 23 Oct 2014 18:41:08 -0700
>
>> introduce two configs:
>> - hidden CONFIG_BPF to select eBPF interpreter that classic socket filters
>>   depend on
>> - visible CONFIG_BPF_SYSCALL (default off) that tracing and sockets can use
>>
>> that solves several problems:
>> - tracing and others that wish to use eBPF don't need to depend on NET.
>>   They can use BPF_SYSCALL to allow loading from userspace or select BPF
>>   to use it directly from kernel in NET-less configs.
>> - in 3.18 programs cannot be attached to events yet, so don't force it on
>> - when the rest of eBPF infra is there in 3.19+, it's still useful to
>>   switch it off to minimize kernel size
>>
>> Signed-off-by: Alexei Starovoitov <ast@...mgrid.com>
>> ---
>>
>> bloat-o-meter on x64 shows:
>> add/remove: 0/60 grow/shrink: 0/2 up/down: 0/-15601 (-15601)
>>
>> tested with many different config combinations. Hopefully didn't miss anything.
>
> Applied with two changes:
>
> 1) boolean --> bool
> 2) Moved bloat-o-meter and testing information into commit message.
>
> Thanks.

Thank you for taking care of it!
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