Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751744AbaLSTob (ORCPT ); Fri, 19 Dec 2014 14:44:31 -0500 Received: from casper.infradead.org ([85.118.1.10]:46573 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750708AbaLSToa (ORCPT ); Fri, 19 Dec 2014 14:44:30 -0500 Date: Fri, 19 Dec 2014 20:44:10 +0100 From: Peter Zijlstra To: Linus Torvalds Cc: Dave Jones , Chris Mason , Mike Galbraith , Ingo Molnar , =?iso-8859-1?Q?D=E2niel?= Fraga , Sasha Levin , "Paul E. McKenney" , Linux Kernel Mailing List , Suresh Siddha , Oleg Nesterov , Peter Anvin Subject: Re: frequent lockups in 3.18rc4 Message-ID: <20141219194410.GO30905@twins.programming.kicks-ass.net> References: <20141218051327.GA31988@redhat.com> <1418918059.17358.6@mail.thefacebook.com> <20141218161230.GA6042@redhat.com> <20141219024549.GB1671@redhat.com> <20141219035859.GA20022@redhat.com> <20141219040308.GB20022@redhat.com> <20141219145528.GC13404@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Dec 19, 2014 at 11:15:21AM -0800, Linus Torvalds wrote: > sched: RT throttling activated > > And after RT throttling, it's random (not even always trinity), but > that's probably because the watchdog thread doesn't run reliably any > more. So if we want to shoot that RT throttling in the head you can do: echo -1 > /proc/sys/kernel/sched_rt_runtime_us That should completely disable that stuff, of course at that point a run-away RR/FIFO thread will hog your cpu indefinitely. -- 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/