Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752853AbbDCLDY (ORCPT ); Fri, 3 Apr 2015 07:03:24 -0400 Received: from mail0.unitn.it ([193.205.194.10]:53593 "EHLO mail0.unitn.it" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752656AbbDCLDX (ORCPT ); Fri, 3 Apr 2015 07:03:23 -0400 X-Greylist: delayed 625 seconds by postgrey-1.27 at vger.kernel.org; Fri, 03 Apr 2015 07:03:23 EDT Date: Fri, 3 Apr 2015 12:52:37 +0200 From: Luca Abeni To: Zhiqiang Zhang Cc: , , , Subject: Re: [PATCH] Documentation/scheduler/sched-deadline.txt: correct definition of density as C_i/min{D_i,P_i} Message-ID: <20150403125237.45b38a71@luca-1225C> In-Reply-To: <1428049113-62546-1-git-send-email-zhangzhiqiang.zhang@huawei.com> References: <1428049113-62546-1-git-send-email-zhangzhiqiang.zhang@huawei.com> X-Mailer: Claws Mail 3.8.0 (GTK+ 2.24.10; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2091 Lines: 53 Hi, On Fri, 3 Apr 2015 16:18:33 +0800 Zhiqiang Zhang wrote: > >From the contex,the definition of the destiny of a task > C_i/min{D_i,T_i},where T_i is not referred before, should be > substituted by C_i/min{D_i,P_i}. You are right, "T_i" should be substituted with "P_i"... But now that I look at it more carefully, I think that "C_i" is also wrong... It should be "WCET_i". BTW, speaking about documentation: I still have some SCHED_DEADLINE documentation patches in my local tree... I'll update and send them in next week. Juri, should I send the patches to you, or submit directly to the mailing list? Thanks, Luca > > ---------------------------------------- > > Signed-off-by: Zhiqiang Zhang > --- > Documentation/scheduler/sched-deadline.txt | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/Documentation/scheduler/sched-deadline.txt > b/Documentation/scheduler/sched-deadline.txt index 21461a0..194664b > 100644 --- a/Documentation/scheduler/sched-deadline.txt > +++ b/Documentation/scheduler/sched-deadline.txt > @@ -169,8 +169,8 @@ CONTENTS > of all the tasks executing on a CPU if and only if the total > utilisation of the tasks running on such a CPU is smaller or equal > than 1. If D_i != P_i for some task, then it is possible to define > the density of > - a task as C_i/min{D_i,T_i}, and EDF is able to respect all the > deadlines > - of all the tasks running on a CPU if the sum sum_i C_i/min{D_i,T_i} > of the > + a task as C_i/min{D_i,P_i}, and EDF is able to respect all the > deadlines > + of all the tasks running on a CPU if the sum sum_i C_i/min{D_i,P_i} > of the densities of the tasks running on such a CPU is smaller or > equal than 1 (notice that this condition is only sufficient, and not > necessary). -- 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/