From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753966AbcAVOPF (ORCPT ); Fri, 22 Jan 2016 09:15:05 -0500 Received: from www.linutronix.de ([62.245.132.108]:46442 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753699AbcAVOOz (ORCPT ); Fri, 22 Jan 2016 09:14:55 -0500 Subject: Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port To: Grygorii Strashko , Mike Galbraith References: <1453108103.4123.4.camel@gmail.com> <20160118201828.GE12309@linutronix.de> <1453170597.3740.7.camel@gmail.com> <20160121125405.GA11749@linutronix.de> <56A21F7D.9070101@ti.com> <56A22C49.5020401@linutronix.de> <56A22FE7.6070005@ti.com> Cc: Thomas Gleixner , LKML , linux-rt-users From: Sebastian Andrzej Siewior X-Enigmail-Draft-Status: N1110 Message-ID: <56A2395D.3090106@linutronix.de> Date: Fri, 22 Jan 2016 15:14:53 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Icedove/38.5.0 MIME-Version: 1.0 In-Reply-To: <56A22FE7.6070005@ti.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 01/22/2016 02:34 PM, Grygorii Strashko wrote: >> Do you still see it with the missing lazy bits? I don't see where this >> could come from. >> > > yep. I've tried it with and without changing _TIF_WORK_MASK > Seems It's triggered by Virtual terminal keyboard_tasklet Just bootet my current v4.4 to cross check what you see and I have this: [ 3.808273] clocksource: Switched to clocksource arch_sys_counter [ 3.851193] keyboard: kbd_init(1609) [ 3.861903] keyboard: kbd_bh(1201) [ 3.868322] keyboard: kbd_init(1612) [ 3.868581] NET: Registered protocol family 2 So. No backtrace here. According to the full dmesg I should have all CPUs up by now. kbd_bh is comming from ksoftirqd as well. No idea why you see this. There is a irq off region which sets and removes RUN bit, I have no idea why you have this backtrace. Sebastian