netdev - Re: [PATCH 3/4] [XFRM]: Kill some bloat

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Date:	Tue, 8 Jan 2008 06:00:07 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	David Miller <davem@...emloft.net>
Cc:	andi@...stfloor.org, herbert@...dor.apana.org.au,
	ilpo.jarvinen@...sinki.fi, netdev@...r.kernel.org, acme@...hat.com,
	paul.moore@...com, latten@...ibm.com
Subject: Re: [PATCH 3/4] [XFRM]: Kill some bloat

On Mon, Jan 07, 2008 at 07:37:00PM -0800, David Miller wrote:
> From: Andi Kleen <andi@...stfloor.org>
> Date: Tue, 8 Jan 2008 03:05:29 +0100
> 
> > On Mon, Jan 07, 2008 at 05:54:58PM -0800, David Miller wrote:
> > > I explicitly left them out.
> > > 
> > > Most of them are abstractions of common 2 or 3 instruction
> > > calculations, and thus should stay inline.
> > 
> > Definitely not in tcp.h. It has quite a lot of very long functions, of
> > which very few really need to be inline: (AFAIK the only one where 
> > it makes really sense is tcp_set_state due to constant evaluation; 
> > although I never quite understood why the callers just didn't 
> > call explicit functions to do these actions) 
> > 
> > % awk '  { line++ } ; /^{/ { start = line } ; /^}/ { n++; r += line-start-2; } ; END { print r/n }' < include/net/tcp.h 
> > 9.48889
> > 
> > The average function length is 9 lines.
> 
> The vast majority of them are one, two, and three liners.

% awk '  { line++ } ; /^{/ { total++; start = line } ; /^}/ { len=line-start-3; if (len > 4) l++; if (len >= 10) k++; } ; END { print total, l, l/total, k, k/total }' < include/net/tcp.h
68 28 0.411765 20 0.294118

41% are over 4 lines, 29% are >= 10 lines.

-Andi

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