linux-kernel - Re: configurable partial slab support on UP

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Date:	Wed, 17 Jul 2013 14:48:55 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Pekka Enberg <penberg@...nel.org>
cc:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>, kernel@...gutronix.de,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: configurable partial slab support on UP

On Wed, 17 Jul 2013, Pekka Enberg wrote:

> > while doing make oldconfig on an !SMP config using 3.11-rc1 I was asked
> > if I want CONFIG_SLUB_CPU_PARTIAL. AFAICT this setting only affects SMP
> > machines? If so I suggest to make the choice depend on SMP and treat the
> > !SMP case as CONFIG_SLUB_CPU_PARTIAL=n.

Sounds ok.
> >
> > This was introduced in commit
> >         345c905 (slub: Make cpu partial slab support configurable)
>
> The per-CPU partial list is used on UP machines as well so the config
> option does affect them. Whether or not they should be used is another
> topic entirely. Christoph, Joonsoo?

cpu partial pages are used to avoid contention which does not exist in the
UP case. We can simply default to off for UP.

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