From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933162AbcA0Ojv (ORCPT ); Wed, 27 Jan 2016 09:39:51 -0500 Received: from casper.infradead.org ([85.118.1.10]:48038 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932494AbcA0Ojt (ORCPT ); Wed, 27 Jan 2016 09:39:49 -0500 Date: Wed, 27 Jan 2016 15:39:46 +0100 From: Peter Zijlstra To: Luca Abeni Cc: linux-kernel@vger.kernel.org, Ingo Molnar , Juri Lelli Subject: Re: [RFC 4/8] Improve the tracking of active utilisation Message-ID: <20160127143946.GR6357@twins.programming.kicks-ass.net> References: <1452785094-3086-1-git-send-email-luca.abeni@unitn.it> <1452785094-3086-5-git-send-email-luca.abeni@unitn.it> <20160114194323.GC6357@twins.programming.kicks-ass.net> <569E29FD.9040909@unitn.it> <20160119134739.GY6357@twins.programming.kicks-ass.net> <20160127143651.4de18ad9@luca-1225C> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160127143651.4de18ad9@luca-1225C> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jan 27, 2016 at 02:36:51PM +0100, Luca Abeni wrote: > Ok, so I implemented this idea, and I am currently testing it... > The first experiments seem to show that there are no problems, but I > just tried some simple workload (rt-app, or some other periodic taskset > scheduled by SCHED_DEADLINE). Do you have suggestions for more > "interesting" (and meaningful) tests/experiments? rt-app is the workload generator, right? I think the most interesting part here is the switched_from path, so you'd want the workload to include a !rt task that gets PI boosted to deadline every so often. Also, does rt-app let tasks die? Or does it spawn N tasks and lets them run jobs until the end? I think you want to put some effort in task_dead_dl() as well. After that, just make sure rt-app generates a _lot_ of tasks such that the migration thing gets used. Other than that, no, not really :-)