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

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Message-ID: <alpine.DEB.2.11.1412111117510.31381@gentwo.org>
Date:	Thu, 11 Dec 2014 11:18:31 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
cc:	akpm@...uxfoundation.org, rostedt@...dmis.org,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	linux-mm@...ck.org, penberg@...nel.org, iamjoonsoo.kim@....com
Subject: Re: [PATCH 0/7] slub: Fastpath optimization (especially for RT) V1

On Thu, 11 Dec 2014, Jesper Dangaard Brouer wrote:

> I was expecting to see at least (specifically) 4.291 ns improvement, as
> this is the measured[1] cost of preempt_{disable,enable] on my system.

Right. Those calls are taken out of the fastpaths by this patchset for
the CONFIG_PREEMPT case. So the numbers that you got do not make much
sense to me.
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