linux-kernel - Re: [PATCH 1/3 v2] slub: prefetch next freelist pointer in __slab

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Message-ID: <1341415579.2583.2134.camel@edumazet-glaptop>
Date:	Wed, 04 Jul 2012 17:26:19 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	JoonSoo Kim <js1304@...il.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH 1/3 v2] slub: prefetch next freelist pointer in
 __slab_alloc()

On Wed, 2012-07-04 at 18:08 +0300, Pekka Enberg wrote:

> That doesn't seem like that obvious win to me... Eric, Christoph?

Its the slow path. I am not convinced its useful on real workloads (not
a benchmark)

I mean, if a workload hits badly slow path, some more important work
should be done to avoid this at a higher level.


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