linux-kernel - Re: [PATCH v2 1/2] mm/slub: optimize alloc/free fastpath by removing preemption on/off

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Message-ID: <20150115230409.2b37c071@grimm.local.home>
Date:	Thu, 15 Jan 2015 23:04:09 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v2 1/2] mm/slub: optimize alloc/free fastpath by
 removing preemption on/off

On Thu, 15 Jan 2015 22:51:30 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> 
> I haven't done benchmarks in a while, so perhaps accessing the %gs
> segment isn't as expensive as I saw it before. I'll have to profile
> function tracing on my i7 and see where things are slow again.

I just ran it on my i7, and yeah, the %gs access isn't much worse than
any of the other instructions. I had an old box that recently died that
I did my last benchmarks on, so that was probably why it made such a
difference.

-- Steve

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