From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757779Ab2BCAAV (ORCPT ); Thu, 2 Feb 2012 19:00:21 -0500 Received: from e9.ny.us.ibm.com ([32.97.182.139]:53309 "EHLO e9.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756006Ab2BCAAS (ORCPT ); Thu, 2 Feb 2012 19:00:18 -0500 Date: Thu, 2 Feb 2012 15:58:52 -0800 From: "Paul E. McKenney" To: Kevin Hilman Cc: linux-kernel@vger.kernel.org, mingo@elte.hu, laijs@cn.fujitsu.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca, josh@joshtriplett.org, niv@us.ibm.com, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, Valdis.Kletnieks@vt.edu, dhowells@redhat.com, eric.dumazet@gmail.com, darren@dvhart.com, fweisbec@gmail.com, patches@linaro.org Subject: Re: [PATCH RFC 0/41] RCU commits for 3.4 Message-ID: <20120202235852.GO2518@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20120201194131.GA10028@linux.vnet.ibm.com> <871uqcc0p9.fsf@ti.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <871uqcc0p9.fsf@ti.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12020300-7182-0000-0000-000000A9931C Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Feb 02, 2012 at 02:47:14PM -0800, Kevin Hilman wrote: > Hi Paul, > > "Paul E. McKenney" writes: > > > This patchset makes RCU more aggressive about entering dyntick-idle mode > > in order to improve energy efficiency, > > I gave this series a spin on an ARM/SMP platform (OMAP4) and the boot > hung (tail end of boot log below.) I then realized that had isolcpus=1 > on the cmdline from a previous experiment. Removing isolcpus from the > cmdline got me back to a working boot. > > IIRC, some want to remove isolcpus, so I'm not sure if it's expected to > work with your series, but thought you'd want to know. Not expected behavior, thank you for testing! Could you please share your .config? Thanx, Paul > Kevin > > > > [ 1.105834] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled > [ 1.353942] omap_uart.0: ttyO0 at MMIO 0x4806a000 (irq = 104) is a OMAP UART0 > [ 1.462707] omap_uart.1: ttyO1 at MMIO 0x4806c000 (irq = 105) is a OMAP UART1 > [ 1.548614] omap_uart.2: ttyO2 at MMIO 0x48020000 (irq = 106) is a OMAP UART2 > [ 1.556304] console [ttyO2] enabled, bootconsole disabled > [ 1.556304] console [ttyO2] enabled, bootconsole disabled > [ 61.587493] INFO: rcu_sched detected stalls on CPUs/tasks: { 1} (detected by 0, t=7682 jiffies) > [ 61.596649] INFO: Stall ended before state dump start >