From: Phillip Susi <psusi@cfl.rr.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Alex Volkov <avcp-lkmail@usa.net>,
"'Jeff Garzik'" <jeff@garzik.org>,
"'Linux Kernel Mailing List'" <linux-kernel@vger.kernel.org>
Subject: Re: aio is unlikely
Date: Fri, 18 May 2007 17:54:32 -0400 [thread overview]
Message-ID: <464E2098.8020900@cfl.rr.com> (raw)
In-Reply-To: <20070518140624.1a4db517.akpm@linux-foundation.org>
Andrew Morton wrote:
> Yes, if you agree with Jeff's original point.
>
> But I don't, actually. Sure, on some machines+workloads, AIO is more
> common than sync IO. But I expect that when we sum across all the
> machines+workloads in the world, sync IO is more common and is hence the
> case we should optimise for.
>
> That's assuming that the unlikely() actually does something.
But as Jeff said, that's not what unlikely is for. It should only be
used when it is unlikely for everybody, all the time, because when it is
right, it helps rather little, but when it is wrong, it hurts a lot.
next prev parent reply other threads:[~2007-05-18 21:54 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200705092101.l49L1CF1023363@hera.kernel.org>
2007-05-09 22:06 ` aio is unlikely Jeff Garzik
2007-05-09 22:18 ` Andrew Morton
2007-05-09 22:37 ` Jeff Garzik
2007-05-18 20:49 ` Alex Volkov
2007-05-18 21:06 ` Andrew Morton
2007-05-18 21:11 ` Jeff Garzik
2007-05-18 21:54 ` Phillip Susi [this message]
2007-05-18 22:12 ` Andrew Morton
2007-05-18 22:37 ` Jeff Garzik
2007-05-19 3:43 ` Nick Piggin
2007-05-19 3:50 ` Jeff Garzik
2007-05-18 21:30 ` Bernd Eckenfels
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