Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932227AbWCLMAV (ORCPT ); Sun, 12 Mar 2006 07:00:21 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751424AbWCLMAV (ORCPT ); Sun, 12 Mar 2006 07:00:21 -0500 Received: from [82.153.166.94] ([82.153.166.94]:12519 "EHLO mail.inprovide.com") by vger.kernel.org with ESMTP id S1751423AbWCLMAU convert rfc822-to-8bit (ORCPT ); Sun, 12 Mar 2006 07:00:20 -0500 To: Lee Revell Cc: linux-kernel@vger.kernel.org Subject: Re: can I bring Linux down by running "renice -20 cpu_intensive_process"? References: <441180DD.3020206@wpkg.org> <1142135077.25358.47.camel@mindpipe> From: =?iso-8859-1?Q?M=E5ns_Rullg=E5rd?= Date: Sun, 12 Mar 2006 12:00:09 +0000 In-Reply-To: <1142135077.25358.47.camel@mindpipe> (Lee Revell's message of "Sat, 11 Mar 2006 22:44:36 -0500") Message-ID: User-Agent: Gnus/5.1007 (Gnus v5.10.7) XEmacs/21.4.15 (linux) MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1082 Lines: 31 Lee Revell writes: > On Fri, 2006-03-10 at 22:01 +0000, M?ns Rullg?rd wrote: >> Jan Engelhardt writes: >> >> >>Subject: can I bring Linux down by running "renice -20 >> >>cpu_intensive_process"? >> >> >> > Depends on what the cpu_intensive_process does. If it tries to >> > allocate lots of memory, maybe. If it's _just_ CPU (as in `perl >> > -e '1 while 1'`), you get a chance that you can input some >> > commands on a terminal to kill it. SCHED_FIFO'ing or >> > SCHED_RR'ing such a process is sudden death of course. >> >> Sysrq+n changes all realtime tasks to normal priority. >> > > A nice -20 SCHED_OTHER task is not realtime, only SCHED_FIFO and > SCHED_RR. Maybe extending sysrq+n to lower the priority of -20 tasks would be a good idea. -- M?ns Rullg?rd mru@inprovide.com - 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/