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From: Arjan van de Ven <arjan@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Eric Dumazet <dada1@cosmosbay.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
"David S. Miller" <davem@davemloft.net>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: include/linux/pcounter.h
Date: Sat, 16 Feb 2008 11:39:09 -0800 [thread overview]
Message-ID: <20080216113909.54c0d3df@laptopd505.fenrus.org> (raw)
In-Reply-To: <20080216112618.ec450f9b.akpm@linux-foundation.org>
On Sat, 16 Feb 2008 11:26:18 -0800
Andrew Morton <akpm@linux-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)
--
If you want to reach me at my work email, use arjan@linux.intel.com
For development, discussion and tips for power savings,
visit http://www.lesswatts.org
next prev parent reply other threads:[~2008-02-16 19:39 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-04 9:44 include/linux/pcounter.h Andrew Morton
2008-02-05 0:20 ` include/linux/pcounter.h David Miller
2008-02-05 0:43 ` include/linux/pcounter.h Andrew Morton
2008-02-16 3:37 ` include/linux/pcounter.h Andrew Morton
2008-02-16 10:07 ` include/linux/pcounter.h Eric Dumazet
2008-02-16 10:50 ` include/linux/pcounter.h Andrew Morton
2008-02-16 12:03 ` include/linux/pcounter.h Eric Dumazet
2008-02-16 19:26 ` include/linux/pcounter.h Andrew Morton
2008-02-16 19:39 ` Arjan van de Ven [this message]
2008-02-17 5:54 ` include/linux/pcounter.h David Miller
2008-02-26 9:24 ` include/linux/pcounter.h Ingo Molnar
2008-02-26 21:35 ` include/linux/pcounter.h David Miller
2008-02-27 7:36 ` include/linux/pcounter.h Ingo Molnar
2008-02-28 1:27 ` include/linux/pcounter.h Arnaldo Carvalho de Melo
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