From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934393Ab2FHRjm (ORCPT ); Fri, 8 Jun 2012 13:39:42 -0400 Received: from terminus.zytor.com ([198.137.202.10]:60912 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752127Ab2FHRjl (ORCPT ); Fri, 8 Jun 2012 13:39:41 -0400 Message-ID: <4FD238CD.8000601@zytor.com> Date: Fri, 08 Jun 2012 10:39:25 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1 MIME-Version: 1.0 To: Steven Rostedt CC: linux-kernel@vger.kernel.org, Ingo Molnar , Andrew Morton , Thomas Gleixner Subject: Re: [PATCH 2/3] x86: Remove cmpxchg from i386 NMI nesting code References: <20120608135200.371649691@goodmis.org> <20120608135603.699156773@goodmis.org> <4FD223E1.1090707@zytor.com> <1339173716.13377.50.camel@gandalf.stny.rr.com> <4FD23626.4020802@zytor.com> <1339176975.13377.56.camel@gandalf.stny.rr.com> In-Reply-To: <1339176975.13377.56.camel@gandalf.stny.rr.com> X-Enigmail-Version: 1.4.1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 06/08/2012 10:36 AM, Steven Rostedt wrote: >> >> On i386 it's infinite, but again, I don't think the code will ever be >> exercised on i386. I'm much more concerned about performance on current >> processors. > > I'm not worried about non i386 here. Some context missing from the patch > is that this code is surrounded by: > Sorry, I meant i386 as in actual i386 processors, as opposed to modern processors in 32-bit mode. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.