linux-kernel - Re: [RT LATENCY] 249 microsecond latency caused by slub's unfreeze

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Message-ID: <1365696307.9609.36.camel@gandalf.local.home>
Date:	Thu, 11 Apr 2013 12:05:07 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Clark Williams <clark@...hat.com>,
	Pekka Enberg <penberg@...nel.org>
Subject: Re: [RT LATENCY] 249 microsecond latency caused by slub's
 unfreeze_partials() code.

On Thu, 2013-03-28 at 17:30 +0000, Christoph Lameter wrote:
> This patch requires the earlier bug fix.
> 
> 
> Subject: slub: Make cpu partial slab support configurable
> 
> cpu partial support can introduce level of indeterminism that is not wanted
> in certain context (like a realtime kernel). Make it configurable.
> 
> Signed-off-by: Christoph Lameter <cl@...ux.com>
> 

Hi Christoph,

I was wondering if you made any more forward progress with with patch
yet. When it goes into mainline, I'd like to backport it to the -rt
stable trees, and will probably make it enabled by default when
PREEMPT_RT is enabled.

Thanks!

-- Steve


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