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

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Date:	Mon, 27 Oct 2014 19:10:43 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	ast@...mgrid.com
Cc:	geert@...ux-m68k.org, josh@...htriplett.org, mingo@...nel.org,
	rostedt@...dmis.org, hannes@...essinduktion.org,
	edumazet@...gle.com, dborkman@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] bpf: split eBPF out of NET

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.
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