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

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Message-ID: <56A244F6.5070909@ti.com>
Date:	Fri, 22 Jan 2016 17:04:22 +0200
From:	Grygorii Strashko <grygorii.strashko@...com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	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 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