From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755724AbbJUQ3b (ORCPT ); Wed, 21 Oct 2015 12:29:31 -0400 Received: from mezzanine.sirena.org.uk ([106.187.55.193]:58124 "EHLO mezzanine.sirena.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750862AbbJUQ3X (ORCPT ); Wed, 21 Oct 2015 12:29:23 -0400 Date: Wed, 21 Oct 2015 17:27:58 +0100 From: Mark Brown To: Frank Rowand Cc: Tomeu Vizoso , Greg Kroah-Hartman , Rob Herring , Russell King , Michael Turquette , Stephen Boyd , Vinod Koul , Dan Williams , Linus Walleij , Alexandre Courbot , Thierry Reding , David Airlie , Terje =?iso-8859-1?Q?Bergstr=F6m?= , Stephen Warren , Wolfram Sang , Grant Likely , Kishon Vijay Abraham I , Sebastian Reichel , Dmitry Eremin-Solenikov , David Woodhouse , Liam Girdwood , Felipe Balbi , Jingoo Han , Lee Jones , Jean-Christophe Plagniol-Villard , Tomi Valkeinen , "linux-kernel@vger.kernel.org" , linux-clk@vger.kernel.org, dmaengine@vger.kernel.org, linux-gpio@vger.kernel.org, "dri-devel@lists.freedesktop.org" , "linux-tegra@vger.kernel.org" , linux-i2c@vger.kernel.org, "devicetree@vger.kernel.org" , "linux-pm@vger.kernel.org" , Linux PWM List , "linux-usb@vger.kernel.org" , linux-fbdev@vger.kernel.org Message-ID: <20151021162758.GP32054@sirena.org.uk> References: <561E1378.6000906@collabora.com> <20151017065750.GA18607@kroah.com> <20151018192931.GY14956@sirena.org.uk> <20151018193757.GA9147@kroah.com> <20151018195330.GB14956@sirena.org.uk> <5627B677.5090109@gmail.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="wrbiW19WTymQQzps" Content-Disposition: inline In-Reply-To: <5627B677.5090109@gmail.com> X-Cookie: HUGH BEAUMONT died in 1982!! User-Agent: Mutt/1.5.24 (2015-08-30) X-SA-Exim-Connect-IP: 94.175.94.161 X-SA-Exim-Mail-From: broonie@sirena.org.uk Subject: Re: [GIT PULL] On-demand device probing X-SA-Exim-Version: 4.2.1 (built Mon, 26 Dec 2011 16:24:06 +0000) X-SA-Exim-Scanned: Yes (on mezzanine.sirena.org.uk) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --wrbiW19WTymQQzps Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Oct 21, 2015 at 08:59:51AM -0700, Frank Rowand wrote: > On 10/19/2015 5:34 AM, Tomeu Vizoso wrote: > > To be clear, I was saying that this series should NOT affect total > > boot times much. > I'm confused. If I understood correctly, improving boot time was > the key justification for accepting this patch set. For example, > from "[PATCH v7 0/20] On-demand device probing": >=20 > I have a problem with the panel on my Tegra Chromebook taking longer > than expected to be ready during boot (St=E9phane Marchesin reported w= hat > is basically the same issue in [0]), and have looked into ordered > probing as a better way of solving this than moving nodes around in the > DT or playing with initcall levels and linking order. >=20 > ... >=20 > With this series I get the kernel to output to the panel in 0.5s, > instead of 2.8s. Overall boot time and time to get some individual built in component up and running aren't the same thing - what this'll do is get things up more in the link order of the leaf consumers rather than deferring those leaf consumers when their dependencies aren't ready yet. > While not as dramatic as your results, they are somewhat supportive. > What has changed your assessment that the on-demand device probing > patches will give a big boot performance increase? Do you have > new data or analysis? See above, my understanding was that the performance improvements were more around improved control/predictability/handwave of the boot ordering rather than total time. --wrbiW19WTymQQzps Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAEBCAAGBQJWJ70OAAoJECTWi3JdVIfQeWcH/j2uOXOzgx7pnrlm7I69Kibp atBDWslC2PLIFyM8NQMCCyylED2dqSr72HHG++eDyB9kHbaaba+ZNu8DDqcbQYSF MaVOWhUulhhEnyRhj3I+aYT+GVZ9QQwTzRau/cUD0Mrqf/lUvGZKUeU+gq34v4DK JfBU6MLZJNjAskQSSLPwzllg2hSb0VP5zy2ScbiawsUyRRNDn5tHUQ+r0K/rlWHJ 9Zjr/q9QxHcDVhdX+bORqc7QCSlQhsrIATItLhLksSaX99iuhTltgGWjE/UonSId LHxDyw9zGss8voGsVVfmBf2FaD1/lEDyVMzGq0+GizxNNwaYXZ/fpGHvSbT2/Sw= =D7aZ -----END PGP SIGNATURE----- --wrbiW19WTymQQzps--