Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751305AbWCLDqp (ORCPT ); Sat, 11 Mar 2006 22:46:45 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751311AbWCLDqp (ORCPT ); Sat, 11 Mar 2006 22:46:45 -0500 Received: from mustang.oldcity.dca.net ([216.158.38.3]:59360 "HELO mustang.oldcity.dca.net") by vger.kernel.org with SMTP id S1751305AbWCLDqo (ORCPT ); Sat, 11 Mar 2006 22:46:44 -0500 Subject: Re: can I bring Linux down by running "renice -20 cpu_intensive_process"? From: Lee Revell To: Luke-Jr Cc: =?ISO-8859-1?Q?M=E5ns_Rullg=E5rd?= , linux-kernel@vger.kernel.org In-Reply-To: <200603120141.08129.luke@dashjr.org> References: <441180DD.3020206@wpkg.org> <200603120141.08129.luke@dashjr.org> Content-Type: text/plain; charset=ISO-8859-1 Date: Sat, 11 Mar 2006 22:46:42 -0500 Message-Id: <1142135202.25358.50.camel@mindpipe> Mime-Version: 1.0 X-Mailer: Evolution 2.5.92 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 706 Lines: 18 On Sun, 2006-03-12 at 01:41 +0000, Luke-Jr wrote: > On Friday 10 March 2006 22:01, M?ns Rullg?rd wrote: > > Sysrq+n changes all realtime tasks to normal priority. > > Would the kernel's main loop (where I presume Sysreq is handled) get a chance > to run with a constantly busy realtime task? No, other tasks will not get to run at all. A SCHED_FIFO task that spins forever is a fatal bug. Making it less dangerous would require making it less useful. Lee - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/