From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1753193AbcBOMhb (ORCPT <rfc822;w@1wt.eu>);
	Mon, 15 Feb 2016 07:37:31 -0500
Received: from mx1.redhat.com ([209.132.183.28]:40595 "EHLO mx1.redhat.com"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1752632AbcBOMh3 (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
	Mon, 15 Feb 2016 07:37:29 -0500
Subject: Re: [PATCH] sched/deadline: Always calculate end of period on
 sched_yield()
To: Juri Lelli <juri.lelli@arm.com>, Steven Rostedt <rostedt@goodmis.org>
References: <20160212181020.7dbaf326@gandalf.local.home>
 <20160215101824.GD22643@pablo>
Cc: LKML <linux-kernel@vger.kernel.org>, Juri Lelli <juri.lelli@gmail.com>,
        Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@kernel.org>,
        Clark Williams <williams@redhat.com>, John Kacur <jkacur@redhat.com>
From: Daniel Bristot de Oliveira <bristot@redhat.com>
Message-ID: <56C1C685.6030601@redhat.com>
Date: Mon, 15 Feb 2016 10:37:25 -0200
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101
 Thunderbird/38.5.0
MIME-Version: 1.0
In-Reply-To: <20160215101824.GD22643@pablo>
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org



On 02/15/2016 08:18 AM, Juri Lelli wrote:
> Do you think we could also skip some of the
> following updates/accounting in this case? Not sure we win anything by
> doing that, though.

I reviewed rostedt's patch and the following updates/accounting
operations. I agree with rostedt's patch, and also agree that
if (delta_exec == 0) it is a good idea to skip some += 0 and
function calls of the next updates/accounting operations,
before the if (dl_runtime_exeeded...).