linux-kernel - Re: include/linux/pcounter.h

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Message-ID: <20080216113909.54c0d3df@laptopd505.fenrus.org>
Date:	Sat, 16 Feb 2008 11:39:09 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Eric Dumazet <dada1@...mosbay.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: include/linux/pcounter.h

On Sat, 16 Feb 2008 11:26:18 -0800
Andrew Morton <akpm@...ux-foundation.org> wrote:

> > indirect functions calls are everywhere in kernel, network, fs,
> > everywhere.
> 
> That doesn't make them fast.

just to emphasize this: an indirect function call is at least as expensive as an atomic operation on 
x86 cpus.... (if not more)

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