Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759349AbYF1WqG (ORCPT ); Sat, 28 Jun 2008 18:46:06 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753366AbYF1Wpz (ORCPT ); Sat, 28 Jun 2008 18:45:55 -0400 Received: from BISCAYNE-ONE-STATION.MIT.EDU ([18.7.7.80]:65137 "EHLO biscayne-one-station.mit.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752410AbYF1Wpy (ORCPT ); Sat, 28 Jun 2008 18:45:54 -0400 Date: Sat, 28 Jun 2008 18:45:29 -0400 (EDT) From: Anders H Kaseorg To: "H. Peter Anvin" cc: Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org Subject: Re: [PATCH] x86_64: Patch paravirt inline replacements when loading modules In-Reply-To: <4866BBC0.3000503@zytor.com> Message-ID: References: <4866BBC0.3000503@zytor.com> User-Agent: Alpine 1.10 (DEB 962 2008-03-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Spam-Flag: NO X-Spam-Score: 0.00 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 796 Lines: 17 On Sat, 28 Jun 2008, H. Peter Anvin wrote: > Not having looked at this in detail, is this a *current* problem or a > *future* problem, i.e. does it fix a bug that's currently in the kernel? It's a current problem. The current situation is that .parainstructions are patched into the kernel core and modules on i386, but only the kernel core on x86_64. This results in a slight performance regression in x86_64 modules, compared to the situation before .parainstructions existed. My patch restores full performance of x86_64 modules. Anders -- 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/