Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751792Ab0GKGqp (ORCPT ); Sun, 11 Jul 2010 02:46:45 -0400 Received: from fafnir.cs.unc.edu ([152.2.129.90]:51696 "EHLO fafnir.cs.unc.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751500Ab0GKGqo convert rfc822-to-8bit (ORCPT ); Sun, 11 Jul 2010 02:46:44 -0400 Subject: Re: periods and deadlines in SCHED_DEADLINE Mime-Version: 1.0 (Apple Message framework v1081) Content-Type: text/plain; charset=iso-8859-1 From: Bjoern Brandenburg In-Reply-To: <1278745706.4390.2.camel@Palantir> Date: Sun, 11 Jul 2010 08:46:12 +0200 Cc: Peter Zijlstra , linux-kernel , Song Yuan , Dmitry Adamushko , Thomas Gleixner , Nicola Manica , Luca Abeni , Claudio Scordino , Harald Gustafsson , bastoni@cs.unc.edu, Giuseppe Lipari Content-Transfer-Encoding: 8BIT Message-Id: <21AA2C13-8831-47A2-9464-28E84DBD72B0@email.unc.edu> References: <1278682707.6083.227.camel@Palantir> <1278685133.1900.201.camel@laptop> <51F8E441-58D7-45E1-B7A0-7A717EDF08B5@email.unc.edu> <1278745706.4390.2.camel@Palantir> To: Raistlin X-Mailer: Apple Mail (2.1081) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1056 Lines: 28 On Jul 10, 2010, at 9:08 AM, Raistlin wrote: >> >> As a side note, almost all global EDF hard real-time admission tests can handle tasks with constrained deadlines transparently. However, as far as I can tell, they do not apply to SCHED_DEADLINE. >> > This is the only part I am not sure I got... Can you explain me what do > you mena by "they do not apply" ? I was under the impression that the kernel implementation is a P-EDF implementation. Now it seems to me that it is in fact a "P-EDF with frequent migrations" implementation. I'd be hesitant to just assume that it "approximates G-EDF" sufficiently well to apply any of the published G-EDF tests. - Bj?rn --- Bj?rn B. Brandenburg Ph.D. Student Dept. of Computer Science University of North Carolina at Chapel Hill http://www.cs.unc.edu/~bbb -- 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/