From mboxrd@z Thu Jan 1 00:00:00 1970 From: Grygorii Strashko Subject: Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port Date: Fri, 22 Jan 2016 17:04:22 +0200 Message-ID: <56A244F6.5070909@ti.com> 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> Mime-Version: 1.0 Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit Cc: Thomas Gleixner , LKML , linux-rt-users To: Sebastian Andrzej Siewior , Mike Galbraith Return-path: In-Reply-To: <56A2395D.3090106@linutronix.de> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-rt-users.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