From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with SMTP id 47E0F6B00CC for ; Mon, 23 Feb 2009 11:41:42 -0500 (EST) Received: from localhost (smtp.ultrahosting.com [127.0.0.1]) by smtp.ultrahosting.com (Postfix) with ESMTP id B769382C32D for ; Mon, 23 Feb 2009 11:46:13 -0500 (EST) Received: from smtp.ultrahosting.com ([74.213.175.254]) by localhost (smtp.ultrahosting.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FC1jrfTYSYrL for ; Mon, 23 Feb 2009 11:46:13 -0500 (EST) Received: from qirst.com (unknown [74.213.171.31]) by smtp.ultrahosting.com (Postfix) with ESMTP id 05B0A82C2A0 for ; Mon, 23 Feb 2009 11:46:09 -0500 (EST) Date: Mon, 23 Feb 2009 11:33:00 -0500 (EST) From: Christoph Lameter Subject: Re: [PATCH 04/20] Convert gfp_zone() to use a table of precalculated value In-Reply-To: <20090223163322.GN6740@csn.ul.ie> Message-ID: References: <1235344649-18265-1-git-send-email-mel@csn.ul.ie> <1235344649-18265-5-git-send-email-mel@csn.ul.ie> <20090223163322.GN6740@csn.ul.ie> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org To: Mel Gorman Cc: Linux Memory Management List , Pekka Enberg , Rik van Riel , KOSAKI Motohiro , Johannes Weiner , Nick Piggin , Linux Kernel Mailing List , Lin Ming , Zhang Yanmin List-ID: On Mon, 23 Feb 2009, Mel Gorman wrote: > I was concerned with mispredictions here rather than the actual assembly > and gfp_zone is inlined so it's lot of branches introduced in a lot of paths. The amount of speculation that can be done by the processor pretty limited to a few instructions. So the impact of a misprediction also should be minimal. The decoder is likely to have sucked in the following code anyways. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org