linux-kernel - Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port

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Message-ID: <56A2395D.3090106@linutronix.de>
Date:	Fri, 22 Jan 2016 15:14:53 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Grygorii Strashko <grygorii.strashko@...com>,
	Mike Galbraith <umgwanakikbuti@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>
Subject: Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port

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