From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264961AbUHCDzY (ORCPT ); Mon, 2 Aug 2004 23:55:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265022AbUHCDzY (ORCPT ); Mon, 2 Aug 2004 23:55:24 -0400 Received: from fw.osdl.org ([65.172.181.6]:54413 "EHLO mail.osdl.org") by vger.kernel.org with ESMTP id S264961AbUHCDzX (ORCPT ); Mon, 2 Aug 2004 23:55:23 -0400 Date: Mon, 2 Aug 2004 20:53:32 -0700 From: Andrew Morton To: Peter Williams Cc: ak@muc.de, linux-kernel@vger.kernel.org Subject: Re: [PATCH] V-3.0 Single Priority Array O(1) CPU Scheduler Evaluation Message-Id: <20040802205332.3413cd6d.akpm@osdl.org> In-Reply-To: <410EDBF5.40205@bigpond.net.au> References: <2oEEn-197-9@gated-at.bofh.it> <410EDBF5.40205@bigpond.net.au> X-Mailer: Sylpheed version 0.9.7 (GTK+ 1.2.10; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Peter Williams wrote: > > > Have you considered submitting one to -mm* for wider testing? > > I've made patches available for 2.6.8-rc2-mm1 and I'll provide them for > mm2 as soon as possible. Is there something else I should be doing? I'll probably drop staircase soon, give nicksched a whizz for a couple of cycles. You're welcome to join the queue ;) But let me re-repeat again that CPU scheduler problems tend to take a _long_ time to turn up - you make some change and two months later some person with a weird workload on expensive hardware hits a nasty corner case. So I do think that we'd have to hit a nasty problem with the current scheduler to go making deep changes. Although most of the fragility has been in CPU/node/HT balancing rather than in the timeslice allocation area. I assume you're not touching the former. It's the desktop users who seem to be more affected by the timeslice allocation algorithms, and the testing turnaround is much faster there.