linux-kernel - Re: [PATCH 0/7] slub: Fastpath optimization (especially for RT) V1

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Message-ID: <alpine.DEB.2.11.1412180856400.2593@gentwo.org>
Date:	Thu, 18 Dec 2014 08:57:39 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Joonsoo Kim <js1304@...il.com>
cc:	Joonsoo Kim <iamjoonsoo.kim@....com>, akpm@...uxfoundation.org,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Pekka Enberg <penberg@...nel.org>,
	Jesper Dangaard Brouer <brouer@...hat.com>
Subject: Re: [PATCH 0/7] slub: Fastpath optimization (especially for RT) V1


On Thu, 18 Dec 2014, Joonsoo Kim wrote:
> > Good idea. How does this affect the !CONFIG_PREEMPT case?
>
> One more this_cpu_xxx makes fastpath slow if !CONFIG_PREEMPT.
> Roughly 3~5%.
>
> We can deal with each cases separately although it looks dirty.

Ok maybe you can come up with a solution that is as clean as possible?
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