From: Andi Kleen <ak@suse.de>
To: bidulock@openss7.org
Cc: Andrew Morton <akpm@osdl.org>,
adilger@clusterfs.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] use unlikely() for current_kernel_time() loop
Date: Thu, 8 Jun 2006 11:14:09 +0200 [thread overview]
Message-ID: <200606081114.09390.ak@suse.de> (raw)
In-Reply-To: <20060608025930.A15559@openss7.org>
> performance increased 2% per hyperthread;
That would surprise me. Most likely you made some measurement error.
I guess it can be a difference if it's used in very hot loops, but then
i would expect a fallthrough path to win. Kernel code very rarely
has hot loops like this.
-Andi
next prev parent reply other threads:[~2006-06-08 9:14 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-07 17:36 [PATCH] use unlikely() for current_kernel_time() loop Andreas Dilger
2006-06-08 2:28 ` Andi Kleen
2006-06-08 5:01 ` Andrew Morton
2006-06-08 5:39 ` Andi Kleen
2006-06-08 6:41 ` Brian F. G. Bidulock
2006-06-08 6:51 ` Andi Kleen
2006-06-08 7:00 ` Brian F. G. Bidulock
2006-06-08 7:07 ` Andi Kleen
2006-06-08 7:43 ` Brian F. G. Bidulock
2006-06-08 8:59 ` Brian F. G. Bidulock
2006-06-08 9:14 ` Andi Kleen [this message]
2006-06-08 9:36 ` Brian F. G. Bidulock
2006-06-08 10:20 ` Andi Kleen
2006-06-08 10:50 ` Brian F. G. Bidulock
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