From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753512AbcAVPEi (ORCPT ); Fri, 22 Jan 2016 10:04:38 -0500 Received: from bear.ext.ti.com ([192.94.94.41]:42500 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753261AbcAVPEe (ORCPT ); Fri, 22 Jan 2016 10:04:34 -0500 Subject: Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port To: Sebastian Andrzej Siewior , 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> <56A2395D.3090106@linutronix.de> CC: Thomas Gleixner , LKML , linux-rt-users From: Grygorii Strashko Message-ID: <56A244F6.5070909@ti.com> Date: Fri, 22 Jan 2016 17:04:22 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1 MIME-Version: 1.0 In-Reply-To: <56A2395D.3090106@linutronix.de> Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 01/22/2016 04:14 PM, Sebastian Andrzej Siewior wrote: > 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. > As of now, i'm too :( - not sure if this could be the case, but my kernel is !SMP # CONFIG_SMP is not set # CONFIG_CPUSETS is not set -- regards, -grygorii