Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755461AbaAFQby (ORCPT ); Mon, 6 Jan 2014 11:31:54 -0500 Received: from merlin.infradead.org ([205.233.59.134]:35373 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754254AbaAFQbx (ORCPT ); Mon, 6 Jan 2014 11:31:53 -0500 Date: Mon, 6 Jan 2014 17:31:23 +0100 From: Peter Zijlstra To: Vincent Guittot Cc: Dietmar Eggemann , "linux-kernel@vger.kernel.org" , "mingo@kernel.org" , "pjt@google.com" , Morten Rasmussen , "cmetcalf@tilera.com" , "tony.luck@intel.com" , "alex.shi@linaro.org" , "preeti@linux.vnet.ibm.com" , "linaro-kernel@lists.linaro.org" , "rjw@sisk.pl" , "paulmck@linux.vnet.ibm.com" , "corbet@lwn.net" , "tglx@linutronix.de" , "len.brown@intel.com" , "arjan@linux.intel.com" , "amit.kucheria@linaro.org" , "james.hogan@imgtec.com" , "schwidefsky@de.ibm.com" , "heiko.carstens@de.ibm.com" Subject: Re: [RFC] sched: CPU topology try Message-ID: <20140106163123.GN31570@twins.programming.kicks-ass.net> References: <20131105222752.GD16117@laptop.programming.kicks-ass.net> <1387372431-2644-1-git-send-email-vincent.guittot@linaro.org> <52B87149.4010801@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jan 06, 2014 at 02:41:31PM +0100, Vincent Guittot wrote: > IMHO, these settings will disappear sooner or later, as an example the > idle/busy _idx are going to be removed by Alex's patch. Well I'm still entirely unconvinced by them.. removing the cpu_load array makes sense, but I'm starting to doubt the removal of the _idx things.. I think we want to retain them in some form, it simply makes sense to look at longer term averages when looking at larger CPU groups. So maybe we can express the things in log_2(group-span) or so, but we need a working replacement for the cpu_load array. Ideally some expression involving the blocked load. Its another one of those things I need to ponder more :-) -- 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/