From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755111AbXJHLvy (ORCPT ); Mon, 8 Oct 2007 07:51:54 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753200AbXJHLvq (ORCPT ); Mon, 8 Oct 2007 07:51:46 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:34291 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753176AbXJHLvq (ORCPT ); Mon, 8 Oct 2007 07:51:46 -0400 Date: Mon, 8 Oct 2007 13:51:42 +0200 From: Ingo Molnar To: Andi Kleen Cc: linux-kernel@vger.kernel.org Subject: Re: [PATCH] [5/6] scheduler: Protect important kernel threads against normalize_rt Message-ID: <20071008115142.GE22199@elte.hu> References: <200710071059.126674000@suse.de> <20071007205958.7D8C41474B@wotan.suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20071007205958.7D8C41474B@wotan.suse.de> User-Agent: Mutt/1.5.14 (2007-02-12) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.1.7-deb -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org * Andi Kleen wrote: > Not only the migration thread, but also softlockup and stop machine > need to be protected against normalize_rt(). Instead of checking for > them all I added a new process flag for this. hm, i dont really like this. The migration thread is an absolute exception because it's needed for a correct scheduler. SysRq-N is like SysRq-U or SysRq-B - last-minute resort in case something Goes Foul. Results are not guaranteed. Ingo