Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761466AbYGJSzf (ORCPT ); Thu, 10 Jul 2008 14:55:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1761269AbYGJSzO (ORCPT ); Thu, 10 Jul 2008 14:55:14 -0400 Received: from gw.goop.org ([64.81.55.164]:58661 "EHLO mail.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761252AbYGJSzM (ORCPT ); Thu, 10 Jul 2008 14:55:12 -0400 Message-ID: <48765B03.6020905@goop.org> Date: Thu, 10 Jul 2008 11:54:59 -0700 From: Jeremy Fitzhardinge User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: "Eric W. Biederman" CC: Mike Travis , "H. Peter Anvin" , Arjan van de Ven , Ingo Molnar , Andrew Morton , Christoph Lameter , Jack Steiner , linux-kernel@vger.kernel.org, Rusty Russell Subject: Re: [RFC 00/15] x86_64: Optimize percpu accesses References: <20080709165129.292635000@polaris-admin.engr.sgi.com> <20080709200757.GD14009@elte.hu> <48751B57.8030605@goop.org> <20080709133958.612635f0@infradead.org> <4875231F.1020506@zytor.com> <487524A0.6020304@goop.org> <487529AE.3060505@zytor.com> <48753A71.2030006@zytor.com> <48763732.7020805@sgi.com> In-Reply-To: X-Enigmail-Version: 0.95.6 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 593 Lines: 15 Eric W. Biederman wrote: > I think we can get away with just simply realloc'ing the percpu area > on each cpu. No fancy table manipulations required. Just update > the base pointer in %gs and in someplace global. > It's perfectly legitimate to take the address of a percpu variable and store it somewhere. We can't move them around. J -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/