linux-kernel - Re: [ANNOUNCE] 3.14-rt1

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Message-ID: <20140423081950.778e1a3a@gandalf.local.home>
Date:	Wed, 23 Apr 2014 08:19:50 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mike Galbraith <umgwanakikbuti@...il.com>
Cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Kacur <jkacur@...hat.com>
Subject: Re: [ANNOUNCE] 3.14-rt1

On Wed, 23 Apr 2014 12:37:05 +0200
Mike Galbraith <umgwanakikbuti@...il.com> wrote:

> On Fri, 2014-04-11 at 20:57 +0200, Sebastian Andrzej Siewior wrote:
> 
> > This -RT series didn't crashed within ~4h testing on my ARM and
> > x86-32.
> > x86-64 crashed after I started hackbench. I figured out that the crash
> > does not happen with lazy-preempt disabled. Therefore the last but one
> > patch in the queue disables lazy preempt on x86-64. With this change the
> > test box survived ~2h without a crash. I look at this later but it looks
> > good now.
> 
> I think the below fixes it (in a more or less minimalist way), but it's
> not very pretty.  Methinks it would be prettier to either clone the x86
> percpu + fold logic, or neutralize that optimization completely when
> PREEMPT_LAZY is enabled.
> 
> x86_32 bit is completely untested, x86_64 hasn't exploded.. yet :) 
> 

This patch makes sense to me.

Acked-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve
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