From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 1 May 2002 22:38:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 1 May 2002 22:38:29 -0400 Received: from holomorphy.com ([66.224.33.161]:35284 "EHLO holomorphy") by vger.kernel.org with ESMTP id ; Wed, 1 May 2002 22:38:28 -0400 Date: Wed, 1 May 2002 19:37:11 -0700 From: William Lee Irwin III To: Andrea Arcangeli Cc: Daniel Phillips , Russell King , linux-kernel@vger.kernel.org Subject: Re: Bug: Discontigmem virt_to_page() [Alpha,ARM,Mips64?] Message-ID: <20020502023711.GF32767@holomorphy.com> Mail-Followup-To: William Lee Irwin III , Andrea Arcangeli , Daniel Phillips , Russell King , linux-kernel@vger.kernel.org In-Reply-To: <20020426192711.D18350@flint.arm.linux.org.uk> <20020501042341.G11414@dualathlon.random> <20020502024740.P11414@dualathlon.random> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Description: brief message Content-Disposition: inline User-Agent: Mutt/1.3.25i Organization: The Domain of Holomorphy Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, May 02, 2002 at 02:47:40AM +0200, Andrea Arcangeli wrote: > Oh yeah, you save 1 microsecond every 10 years of uptime by taking > advantage of the potentially coalesced cacheline between the last page > in a node and the first page of the next node. Before you can care about > this optimizations you should remove from x86 the pgdat loops that are > not needed with discontigmem disabled like in x86 (this has nothing to > do with discontigmem/nonlinear). That wouldn't be measurable too but at > least it would be more worthwhile. Which ones did you have in mind? I did poke around this area a bit, and already have my eye on one... Cheers, Bill