Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754338AbbBTLvi (ORCPT ); Fri, 20 Feb 2015 06:51:38 -0500 Received: from foss-mx-na.foss.arm.com ([217.140.108.86]:44237 "EHLO foss-mx-na.foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753955AbbBTLvh (ORCPT ); Fri, 20 Feb 2015 06:51:37 -0500 Date: Fri, 20 Feb 2015 11:52:41 +0000 From: Morten Rasmussen To: Peter Zijlstra Cc: Vincent Guittot , "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: <20150220115241.GE22059@e105550-lin.cambridge.arm.com> References: <1421316570-23097-1-git-send-email-vincent.guittot@linaro.org> <20150219124940.GA22059@e105550-lin.cambridge.arm.com> <20150220113447.GO5029@twins.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150220113447.GO5029@twins.programming.kicks-ass.net> 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: 840 Lines: 17 On Fri, Feb 20, 2015 at 11:34:47AM +0000, Peter Zijlstra wrote: > On Thu, Feb 19, 2015 at 12:49:40PM +0000, Morten Rasmussen wrote: > > > Also, it still not clear why patch 10 uses relative capacity reduction > > instead of absolute capacity available to CFS tasks. > > As present in your asymmetric big and small systems? Yes it would be > unfortunate to migrate a task to an idle small core when the big core is > still faster, even if reduced by rt/irq work. Yes, exactly. I don't think it would cause any harm for symmetric cases to use absolute capacity instead. Am I missing something? -- 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/