Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753173AbbBSMsn (ORCPT ); Thu, 19 Feb 2015 07:48:43 -0500 Received: from foss-mx-na.foss.arm.com ([217.140.108.86]:44107 "EHLO foss-mx-na.foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752720AbbBSMsm (ORCPT ); Thu, 19 Feb 2015 07:48:42 -0500 Date: Thu, 19 Feb 2015 12:49:40 +0000 From: Morten Rasmussen To: Vincent Guittot Cc: "peterz@infradead.org" , "mingo@kernel.org" , "linux-kernel@vger.kernel.org" , "preeti@linux.vnet.ibm.com" , "kamalesh@linux.vnet.ibm.com" , "riel@redhat.com" , "efault@gmx.de" , "nicolas.pitre@linaro.org" , Dietmar Eggemann , "linaro-kernel@lists.linaro.org" Subject: Re: [PATCH RESEND v9 00/10] sched: consolidation of CPU capacity and usage Message-ID: <20150219124940.GA22059@e105550-lin.cambridge.arm.com> References: <1421316570-23097-1-git-send-email-vincent.guittot@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1421316570-23097-1-git-send-email-vincent.guittot@linaro.org> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1447 Lines: 28 On Thu, Jan 15, 2015 at 10:09:20AM +0000, Vincent Guittot wrote: > This patchset consolidates several changes in the capacity and the usage > tracking of the CPU. It provides a frequency invariant metric of the usage of > CPUs and generally improves the accuracy of load/usage tracking in the > scheduler. The frequency invariant metric is the foundation required for the > consolidation of cpufreq and implementation of a fully invariant load tracking. > These are currently WIP and require several changes to the load balancer > (including how it will use and interprets load and capacity metrics) and > extensive validation. The frequency invariance is done with > arch_scale_freq_capacity and this patchset doesn't provide the backends of > the function which are architecture dependent. > > As discussed at LPC14, Morten and I have consolidated our changes into a single > patchset to make it easier to review and merge. I'm happy with patch 1, 3, 5, 6, and 7. Add my acked-by if you like :) The last few needs buy-in from somebody running SMT systems I think. Also, it still not clear why patch 10 uses relative capacity reduction instead of absolute capacity available to CFS tasks. Morten -- 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/