netdev - Re: [PATCH v2] net: filter: Just In Time compiler

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Date:	Thu, 14 Apr 2011 16:55:49 +0200
From:	Hagen Paul Pfeifer <hagen@...u.net>
To:	Avi Kivity <avi@...hat.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ben Hutchings <bhutchings@...arflare.com>
Subject: Re: [PATCH v2] net: filter: Just In Time compiler


On Thu, 14 Apr 2011 17:40:03 +0300, Avi Kivity <avi@...hat.com> wrote:

> Have you considered putting the compiler in userspace?

Kernelspace (modules, threads, etc) can register BPF filters too. It is
possible that there is no userspace involved at all.

> The upside is that you can use established optimizing compilers like 
> LLVM or GCC, which already support more target architectures.  It may 
> not matter much for something simple like bpf, but other VMs may be a 
> lot more complicated.

BPF is another domain. Standard compiler optimization are not comparable
to BPF optimizations so there is no gain there. Maybe writing a gcc front
_and_ back-end may gain some valuable advantages.

Hagen 
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