Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754089Ab3HVIAD (ORCPT ); Thu, 22 Aug 2013 04:00:03 -0400 Received: from smtp4-g21.free.fr ([212.27.42.4]:50848 "EHLO smtp4-g21.free.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753195Ab3HVH74 convert rfc822-to-8bit (ORCPT ); Thu, 22 Aug 2013 03:59:56 -0400 Date: Thu, 22 Aug 2013 10:00:08 +0200 From: Jean-Francois Moine To: Grant Likely Cc: Rob Herring , "devicetree@vger.kernel.org" , Linux Kernel Mailing List , "linux-arm-kernel@lists.infradead.org" Subject: Re: [PATCH] of: reduce the number of PROBE_DEFERs Message-ID: <20130822100008.2669b0d9@armhf> In-Reply-To: References: <20130820120105.55a4c0ce@armhf> X-Mailer: Claws Mail 3.9.2 (GTK+ 2.24.20; arm-unknown-linux-gnueabihf) Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1462 Lines: 34 On Tue, 20 Aug 2013 11:13:24 +0100 Grant Likely wrote: > On Tue, Aug 20, 2013 at 11:01 AM, Jean-Francois Moine wrote: > > This patch populates the platform from the device tree into two steps: > > the first step creates the nodes that are referenced by a phandle, > > the second step creates the other nodes. > > > > This permits to reduce the number of PROBE_DEFERs. > > > > Signed-off-by: Jean-Francois Moine > > --- > > A better way to reduce probe deferral could be sorting the nodes > > according to their phandle level in the DT blob at compilation time ... > > Have you got measurements or statistics that show this making a > difference? I suspect you'll find for boot time it will have little to > no affect since the device driver probe order is more closely related > to the kernel link order than the order that devices were registered. With the device tree and most drivers as modules, the kernel link order does not matter. I admit that the gain may be small: I just get none or just one probe deferral instead of 3 on my cubox with this patch. -- Ken ar c'hentañ | ** Breizh ha Linux atav! ** Jef | http://moinejf.free.fr/ -- 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/