From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751396AbXBMWtO (ORCPT ); Tue, 13 Feb 2007 17:49:14 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751397AbXBMWtO (ORCPT ); Tue, 13 Feb 2007 17:49:14 -0500 Received: from gw.goop.org ([64.81.55.164]:33722 "EHLO mail.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751396AbXBMWtN (ORCPT ); Tue, 13 Feb 2007 17:49:13 -0500 Message-ID: <45D24066.4070109@goop.org> Date: Tue, 13 Feb 2007 14:49:10 -0800 From: Jeremy Fitzhardinge User-Agent: Thunderbird 1.5.0.9 (X11/20070212) MIME-Version: 1.0 To: Zachary Amsden CC: Andi Kleen , Andrew Morton , linux-kernel@vger.kernel.org, virtualization@lists.osdl.org, xen-devel@lists.xensource.com, Chris Wright , Ian Pratt , Christian Limpach Subject: Re: [patch 13/21] Xen-paravirt: Add nosegneg capability to the vsyscall page notes References: <20070213221729.772002682@goop.org> <20070213221830.466651996@goop.org> <45D23F97.5040907@vmware.com> In-Reply-To: <45D23F97.5040907@vmware.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Zachary Amsden wrote: > I don't like this because now a kernel compiled with both CONFIG_XEN > and CONFIG_VMI has "nosegneg" turned on. We don't actually require > this for performance or correctness, so it would be nice to be able to > dynamically turn it off instead of having it forced. Any suggestions about how to do this? It seems hard to have a note dynamically appear and disappear in the vsyscall.so. I wasn't terribly concerned about this, since there is effectively zero performance difference between the two library implementations. J From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeremy Fitzhardinge Subject: Re: [patch 13/21] Xen-paravirt: Add nosegneg capability to the vsyscall page notes Date: Tue, 13 Feb 2007 14:49:10 -0800 Message-ID: <45D24066.4070109@goop.org> References: <20070213221729.772002682@goop.org> <20070213221830.466651996@goop.org> <45D23F97.5040907@vmware.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <45D23F97.5040907@vmware.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Zachary Amsden Cc: Andrew Morton , xen-devel@lists.xensource.com, Ian Pratt , virtualization@lists.osdl.org, linux-kernel@vger.kernel.org, Chris Wright , Andi Kleen , Christian Limpach List-Id: virtualization@lists.linuxfoundation.org Zachary Amsden wrote: > I don't like this because now a kernel compiled with both CONFIG_XEN > and CONFIG_VMI has "nosegneg" turned on. We don't actually require > this for performance or correctness, so it would be nice to be able to > dynamically turn it off instead of having it forced. Any suggestions about how to do this? It seems hard to have a note dynamically appear and disappear in the vsyscall.so. I wasn't terribly concerned about this, since there is effectively zero performance difference between the two library implementations. J