From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753091Ab0IVJXF (ORCPT ); Wed, 22 Sep 2010 05:23:05 -0400 Received: from bombadil.infradead.org ([18.85.46.34]:52072 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752289Ab0IVJXE convert rfc822-to-8bit (ORCPT ); Wed, 22 Sep 2010 05:23:04 -0400 Subject: Re: [PATCH/RFC] timer: fix deadlock on cpu hotplug From: Peter Zijlstra To: Heiko Carstens Cc: Tejun Heo , Thomas Gleixner , Ingo Molnar , Andrew Morton , Rusty Russell , linux-kernel@vger.kernel.org In-Reply-To: <20100922083706.GA2177@osiris.boeblingen.de.ibm.com> References: <20100921142017.GA2291@osiris.boeblingen.de.ibm.com> <4C98D0EB.30002@kernel.org> <1285083618.2275.884.camel@laptop> <20100922083706.GA2177@osiris.boeblingen.de.ibm.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Date: Wed, 22 Sep 2010 11:22:42 +0200 Message-ID: <1285147362.2275.896.camel@laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2010-09-22 at 10:37 +0200, Heiko Carstens wrote: > > I've wanted to pull the whole migration thread out from SCHED_FIFO for a > > while. Doing that is probably the easiest thing. > > Something like th No that makes it a SCHED_OTHER task, and will indeed result in a wedged system very quickly. The idea was to move it to a class of its own above SCHED_FIFO. I'll try and get something done, but I'm heading out to LinuxCon.JP soon.