From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2993023AbXCIHEz (ORCPT ); Fri, 9 Mar 2007 02:04:55 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S2993024AbXCIHEz (ORCPT ); Fri, 9 Mar 2007 02:04:55 -0500 Received: from adsl-69-232-92-238.dsl.sndg02.pacbell.net ([69.232.92.238]:46621 "EHLO gnuppy.monkey.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2993023AbXCIHEy (ORCPT ); Fri, 9 Mar 2007 02:04:54 -0500 Date: Thu, 8 Mar 2007 23:04:46 -0800 To: Linus Torvalds Cc: Bill Davidsen , Ed Tomlinson , Gene Heskett , linux-kernel@vger.kernel.org, Andrew Morton , Lee Revell , Nicolas Mailhot , "Bill Huey (hui)" Subject: Re: [ANNOUNCE] RSDL completely fair starvation free interactive cpu scheduler Message-ID: <20070309070446.GA3487@gnuppy.monkey.org> References: <54348.192.54.193.51.1173087934.squirrel@rousalka.dyndns.org> <75b66ecd0703051020h1f0c1f85r15a5de082a80cec0@mail.gmail.com> <200703051419.25814.gene.heskett@gmail.com> <200703052123.29421.edt@aei.ca> <45F0DCB7.5020908@tmr.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.13 (2006-08-11) From: Bill Huey (hui) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Mar 08, 2007 at 10:31:48PM -0800, Linus Torvalds wrote: > On Thu, 8 Mar 2007, Bill Davidsen wrote: > > Please, could you now rethink plugable scheduler as well? Even if one had to > > be chosen at boot time and couldn't be change thereafter, it would still allow > > a few new thoughts to be included. > > No. Really. > > I absolutely *detest* pluggable schedulers. They have a huge downside: > they allow people to think that it's ok to make special-case schedulers. > And I simply very fundamentally disagree. Linus, This is where I have to respectfully disagree. There are types of loads that aren't covered in SCHED_OTHER. They are typically certain real time loads and those folks (regardless of -rt patch) would benefit greatly from having something like that in place. Those scheduler developers can plug in (at compile time) their work without having to track and forward port their code constantly so that non-SCHED_OTHER policies can be experimented with easily. This is especially so with rate monotonic influenced schedulers that are in the works by real time folks, stock kernel or not. This is about making Linux generally accessible to those folks and not folks doing SCHED_OTHER work. They are orthogonal. bill