From: Mitchell Blank Jr <mitch@sfgoth.com>
To: Andi Kleen <ak@suse.de>
Cc: "David S. Miller" <davem@davemloft.net>,
rml@novell.com, akpm@osdl.org, linux-kernel@vger.kernel.org
Subject: Re: [patch] IBM HDAPS accelerometer driver, with probing.
Date: Fri, 26 Aug 2005 21:06:22 -0700 [thread overview]
Message-ID: <20050827040622.GH91880@gaz.sfgoth.com> (raw)
In-Reply-To: <p73vf1skt0g.fsf@verdi.suse.de>
Andi Kleen wrote:
> - it doesn't seem to help that much on modern CPUs with good
> branch prediction and big icaches anyways.
Really? I would think that as pipelines get deeper (although that trend
seems to have stopped, thankfully) and Icache-miss penalties get relatively
larger we'd see unlikely() becoming MORE of a benefit, not less. Storing
the used part of a "hot" function in 1 Icacheline instead of 4 seems like
an obvious win.
Personally I've never found unlikely() to be ugly; if anything I think
it serves as a nice little human-readable comment about whats going on
in the control-flow. I guess I'm in the minority on that one, though.
-Mitch
next prev parent reply other threads:[~2005-08-27 3:58 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-26 22:18 Robert Love
2005-08-26 22:44 ` Dmitry Torokhov
2005-08-26 23:37 ` Robert Love
2005-08-27 5:29 ` Arnaldo Carvalho de Melo
2005-08-27 14:45 ` Alan Cox
2005-08-26 22:58 ` Alexey Dobriyan
2005-08-26 23:15 ` David S. Miller
2005-08-27 2:34 ` Andi Kleen
2005-08-27 2:49 ` David S. Miller
2005-08-27 4:06 ` Mitchell Blank Jr [this message]
2005-08-27 5:34 ` Arnaldo Carvalho de Melo
2005-08-27 6:12 ` Dmitry Torokhov
2005-08-27 11:35 ` Alexey Dobriyan
2005-08-27 14:56 ` Andi Kleen
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