Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758092Ab2JZJw3 (ORCPT ); Fri, 26 Oct 2012 05:52:29 -0400 Received: from mail-la0-f46.google.com ([209.85.215.46]:59643 "EHLO mail-la0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754281Ab2JZJw1 (ORCPT ); Fri, 26 Oct 2012 05:52:27 -0400 MIME-Version: 1.0 In-Reply-To: <1351244130.16863.7.camel@twins> References: <1351115634-8420-1-git-send-email-juri.lelli@gmail.com> <1351115634-8420-2-git-send-email-juri.lelli@gmail.com> <1351172849.12171.10.camel@twins> <1351241389.12171.45.camel@twins> <20121026092421.GB628@gmail.com> <1351244130.16863.7.camel@twins> Date: Fri, 26 Oct 2012 11:52:25 +0200 Message-ID: Subject: Re: [PATCH 01/16] math128: Introduce various 128bit primitives From: Harald Gustafsson To: Peter Zijlstra Cc: Ingo Molnar , Linus Torvalds , Juri Lelli , tglx@linutronix.de, mingo@redhat.com, rostedt@goodmis.org, oleg@redhat.com, fweisbec@gmail.com, darren@dvhart.com, johan.eker@ericsson.com, p.faure@akatech.ch, linux-kernel@vger.kernel.org, claudio@evidence.eu.com, michael@amarulasolutions.com, fchecconi@gmail.com, tommaso.cucinotta@sssup.it, nicola.manica@disi.unitn.it, luca.abeni@unitn.it, dhaval.giani@gmail.com, paulmck@linux.vnet.ibm.com, raistlin@linux.it, insop.song@ericsson.com, liming.wang@windriver.com, jkacur@redhat.com, harald.gustafsson@ericsson.com, vincent.guittot@linaro.org, Andrew Morton Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 771 Lines: 16 On Fri, Oct 26, 2012 at 11:35 AM, Peter Zijlstra wrote: > dl_period * dl_runtime < U64_MAX && dl_deadline * dl_runtime < U64_MAX I think this makes sense to make the limitation on the product, since IMO if you need a period longer than 4 seconds then the runtime is much shorter due to that you want to express something like executing for 100ms each 10s. Much less likely that an application would need to execute for 7.8 s out of a period of 8s and would not be happy with 3.9s out of 4s. /Harald -- 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/