Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759049AbXL3WCp (ORCPT ); Sun, 30 Dec 2007 17:02:45 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758785AbXL3WC1 (ORCPT ); Sun, 30 Dec 2007 17:02:27 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:33435 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758734AbXL3WCZ (ORCPT ); Sun, 30 Dec 2007 17:02:25 -0500 Date: Sun, 30 Dec 2007 22:54:35 +0100 From: Ingo Molnar To: Alan Cox Cc: Linus Torvalds , Rene Herman , dpreed@reed.com, Islam Amer , hpa@zytor.com, Pavel Machek , Ingo Molnar , Andi Kleen , Thomas Gleixner , Linux Kernel Subject: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override Message-ID: <20071230215435.GA31386@elte.hu> References: <477711DC.5030800@keyaccess.nl> <20071230144700.78f4605c@the-village.bc.nu> <20071230152835.GX16946@elte.hu> <4777BDA5.4050203@keyaccess.nl> <20071230203417.GA12949@elte.hu> <20071230212820.0d53f389@the-village.bc.nu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20071230212820.0d53f389@the-village.bc.nu> User-Agent: Mutt/1.5.17 (2007-11-01) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 981 Lines: 23 * Alan Cox wrote: > You won't bisect obscure timing triggered problems, and the _p users > are almost all for hardware where performance doesn't matter one iota > (eg CMOS). actually, people have, and i have too. But i agree that io_delay=none would be stupid now, and would probably be stupid in v2.6.26 too. i also have a debug patch that counts the number of _p() API uses and prints a stacktrace (once per bootup) if it occurs [wrote it 2 weeks ago] - so i agree with you that we can do this more gradually and more intelligently. As long as it does not turn into a BKL situation. It's 2008 in a day and we've still got the NFS client code running under the BKL - quite ridiculous IMO. Ingo -- 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/