Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754759AbbLJP7w (ORCPT ); Thu, 10 Dec 2015 10:59:52 -0500 Received: from mezzanine.sirena.org.uk ([106.187.55.193]:41343 "EHLO mezzanine.sirena.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750910AbbLJP7u (ORCPT ); Thu, 10 Dec 2015 10:59:50 -0500 Date: Thu, 10 Dec 2015 15:59:40 +0000 From: Mark Brown To: Dietmar Eggemann Cc: Juri Lelli , linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, peterz@infradead.org, vincent.guittot@linaro.org, robh+dt@kernel.org, mark.rutland@arm.com, linux@arm.linux.org.uk, sudeep.holla@arm.com, lorenzo.pieralisi@arm.com, catalin.marinas@arm.com, will.deacon@arm.com, morten.rasmussen@arm.com Message-ID: <20151210155940.GN5727@sirena.org.uk> References: <1448288921-30307-1-git-send-email-juri.lelli@arm.com> <1448288921-30307-9-git-send-email-juri.lelli@arm.com> <566988E8.3010308@arm.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="L9+4a/fGFceRH8Zi" Content-Disposition: inline In-Reply-To: <566988E8.3010308@arm.com> X-Cookie: revolutionary, adj.: 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: [RFC PATCH 8/8] arm64: add sysfs cpu_capacity attribute 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 Content-Length: 1625 Lines: 43 --L9+4a/fGFceRH8Zi Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Thu, Dec 10, 2015 at 02:15:04PM +0000, Dietmar Eggemann wrote: > On 23/11/15 14:28, Juri Lelli wrote: > > The new attribute shows up as: > > /sys/devices/system/cpu/cpu*/cpu_capacity > This sysfs interface is not really needed for arm or arm64. People can > build the dt blob if they want to change the values. Less code to carry > ... Let's focus on the core functionality, which is parsing cpu capacity > from dt file to task scheduler for heterogeneous systems. That does make the tuning process much more cumbersome - users have to rebuild and reboot to tweak the numbers rather than just tweaking the numbers and rerunning the benchmark (which seems like something people would want to automate). --L9+4a/fGFceRH8Zi Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAEBCAAGBQJWaaFrAAoJECTWi3JdVIfQK5MH/iqYULaurRnAV257I8eatNYA NQfOpgs2vo3VnZ9DmloohrhNauolPsL6j3hNQyPi02tT2EFESsE74+nOfvmkBhFt mxYFP0mojFhf3ZtVaFWNkfJ01I8KO3XmVsVgYgLMuo4ZuacT6A+wyZ8nxoOuv04L ofIUTf3MJkHnanwwZPYTqnWapMtLXkV1IYUKydH1CghQkWMstSiQW/Iqqke0Y+3b ws358JSP8Pb+/AYkY960MaSSbFUoM6Ct61LFq8whKvT0Egt7pRcerPke+04upB26 GFfwlFP0+WD8M6RVZjvnkh0Q5hNIA9D6NWUn5JpK8iGUrwkpLb3V7wXk9S9wgwU= =JV60 -----END PGP SIGNATURE----- --L9+4a/fGFceRH8Zi-- -- 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/