Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757441AbXEINih (ORCPT ); Wed, 9 May 2007 09:38:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753091AbXEINia (ORCPT ); Wed, 9 May 2007 09:38:30 -0400 Received: from mtagate5.de.ibm.com ([195.212.29.154]:33524 "EHLO mtagate5.de.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751965AbXEINi3 (ORCPT ); Wed, 9 May 2007 09:38:29 -0400 Date: Wed, 9 May 2007 15:38:13 +0200 From: Cornelia Huck To: Greg KH Cc: Linus Torvalds , Adrian Bunk , linux-kernel Subject: Re: Please revert 5adc55da4a7758021bcc374904b0f8b076508a11 (PCI_MULTITHREAD_PROBE) Message-ID: <20070509153813.52a7c397@gondolin.boeblingen.de.ibm.com> In-Reply-To: <20070509095302.GA13053@kroah.com> References: <20070508153713.344cc881@gondolin.boeblingen.de.ibm.com> <20070508141149.GJ4226@stusta.de> <20070508183846.28a94797@gondolin.boeblingen.de.ibm.com> <20070509095302.GA13053@kroah.com> Organization: IBM Deutschland Entwicklung GmbH X-Mailer: Claws Mail 2.9.1 (GTK+ 2.10.12; i486-pc-linux-gnu) X-Legal: IBM Deutschland Entwicklung GmbH Vorsitzender des Aufsichtsrats: Johann Weihen =?ISO-8859-15?Q?Gesch=E4ftsf=FChrung:?= Herbert Kircher Sitz der Gesellschaft: =?ISO-8859-15?Q?B=F6blingen?= Registergericht: Amtsgericht Stuttgart, HRB 243294 Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1218 Lines: 27 On Wed, 9 May 2007 02:53:02 -0700, Greg KH wrote: > > 2. Sheer volume of devices on a bus. Even if the indivdual probing > > doesn't take long, having all devices probed one after the other may > > take a lot of time. Putting the actual probe on a thread makes it > > possible to run several probes in parallel, thereby cutting probing > > time. > > Again, not for PCI, right? It seems that everyone agrees now that moving PCI over to a new probing model without individual driver support was a bad idea. So generic multithreaded probing is dead. > If you want to implement this for your bus type, fine, I have no > objection to that at all, but not for PCI, it's just not worth it. Infrastructure for async probing might not be such a bad idea, though. (Aren't there some huge PCI-based machines?) However, I don't really care whether PCI or SCSI or $HUGE_BUS use it, but serial synchronous probing on a bus looks like a killer on most large systems. - 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/