From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail172.messagelabs.com (mail172.messagelabs.com [216.82.254.3]) by kanga.kvack.org (Postfix) with SMTP id 4828D6B00CE for ; Mon, 23 Feb 2009 12:14:23 -0500 (EST) Received: from localhost (smtp.ultrahosting.com [127.0.0.1]) by smtp.ultrahosting.com (Postfix) with ESMTP id E092F82C288 for ; Mon, 23 Feb 2009 12:18:54 -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 jM7Hv7WKIKTa for ; Mon, 23 Feb 2009 12:18:54 -0500 (EST) Received: from qirst.com (unknown [74.213.171.31]) by smtp.ultrahosting.com (Postfix) with ESMTP id 6F73982C34D for ; Mon, 23 Feb 2009 12:17:21 -0500 (EST) Date: Mon, 23 Feb 2009 12:03:50 -0500 (EST) From: Christoph Lameter Subject: Re: [PATCH 04/20] Convert gfp_zone() to use a table of precalculated value In-Reply-To: <20090223164047.GO6740@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> <200902240241.48575.nickpiggin@yahoo.com.au> <20090223164047.GO6740@csn.ul.ie> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org To: Mel Gorman Cc: Nick Piggin , 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: > > Maybe we can come up with a version of gfp_zone that has no branches and > > no lookup? > > > > Ideally, yes, but I didn't spot any obvious way of figuring it out at > compile time then or now. Suggestions? Can we just mask the relevant bits and then find the highest set bit? With some rearrangement of gfp flags this may work. -- 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