linux-kernel - Re: [rfc patch v2] rt,nohz_full: fix nohz_full for PREEMPT_RT

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Date:	Fri, 10 Apr 2015 16:28:34 +0200
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: [rfc patch v2] rt,nohz_full: fix nohz_full for PREEMPT_RT_FULL

On Fri, 2015-04-10 at 16:15 +0200, Sebastian Andrzej Siewior wrote:
> * Mike Galbraith | 2015-03-13 05:53:25 [+0100]:
> 
> > First of all, a task being ticked and trying to shut the tick down 
> > will
> > fail to do so due to having just awakened ksoftirqd, so let 
> > ksoftirqd
> > try to do that after SOFTIRQ_TIMER processing.  Secondly, should 
> > the
> > tick be shut down, we may livelock in hrtimer-cancel() because in -
> > rt
> > a callback may be running.  Break the loop, and let 
> > tick_nohz_restart()
> > know that the timer is busy so it can bail.
> 
> So with this patch
>     http://marc.info/?l=linux-rt-users&m=142866940327602&w=2

Oh duh, too much of a hurry, I'll give that a spin.

        -Mike 
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