linux-kernel - Re: [patch-3.18.7-rt1] sched/context-tracking: fix PREEMPT

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Message-ID: <1425911771.30469.8.camel@gmail.com>
Date:	Mon, 09 Mar 2015 15:36:11 +0100
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	linux-rt-users <linux-rt-users@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>, rostedt@...dmis.org,
	John Kacur <jkacur@...hat.com>
Subject: Re: [patch-3.18.7-rt1] sched/context-tracking: fix PREEMPT_LAZY
 explosions

On Mon, 2015-03-09 at 14:45 +0100, Sebastian Andrzej Siewior wrote:
> * Mike Galbraith | 2015-02-18 12:21:54 [+0100]:
> 
> >On Mon, 2015-02-16 at 12:18 +0100, Sebastian Andrzej Siewior wrote:
> >
> >> Known issues:
> >>
> >>       - lazy preempt on x86_64 leads to a crash with some load.
> >
> >The below still works for me.  (it doesn't make nohz_full actually work
> >in rt, but at least folks who want to tinker with it can do so)
> So your box still crashes without it?
> 
> The thing is I tried to reproduce it and it does not occur anymore.
> Neither in KVM nor on real HW.

Heh, well that's interesting, I just presumed it would still explode
because you said it would.  I'll beat on it any let you know if I'm
carrying a placebo patch or not :)

	-Mike

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