Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762086AbYG3OIy (ORCPT ); Wed, 30 Jul 2008 10:08:54 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751529AbYG3OIq (ORCPT ); Wed, 30 Jul 2008 10:08:46 -0400 Received: from iolanthe.rowland.org ([192.131.102.54]:54961 "HELO iolanthe.rowland.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1750887AbYG3OIp (ORCPT ); Wed, 30 Jul 2008 10:08:45 -0400 Date: Wed, 30 Jul 2008 10:08:42 -0400 (EDT) From: Alan Stern X-X-Sender: stern@iolanthe.rowland.org To: Simon Arlott cc: Rene Herman , Arjan van de Ven , , , Daniel Walker Subject: Re: [patch 5/3] fastboot: sync the async execution before late_initcall and move level 6s (sync) first In-Reply-To: <488F9AE3.8040207@simon.arlott.org.uk> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 873 Lines: 23 On Tue, 29 Jul 2008, Simon Arlott wrote: > It doesn't appear to be possible to init multiple PCI devices at once... > I haven't looked into what is doing it exactly but presumably there's a > lock being held over the whole device probe process. > > The speedup from usb seems to be primarily from initialising devices in > the background... perhaps there's some way to do that without doing hcd > init from a second thread? You could provide useful details by booting a kernel with CONFIG_USB_DEBUG enabled. The USB stack _already_ initializes USB devices (i.e., not host controllers) in a separate thread. Alan Stern -- 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/