linux-kernel - Re: [patch 3/3] Increase default reserve percpu area

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Message-ID: <84144f020809191502i35805980n97dc3073ab8a52bc@mail.gmail.com>
Date:	Sat, 20 Sep 2008 01:02:09 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Christoph Lameter" <cl@...ux-foundation.org>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, jeremy@...p.org, ebiederm@...ssion.com,
	travis@....com, herbert@...dor.apana.org.au, xemul@...nvz.org
Subject: Re: [patch 3/3] Increase default reserve percpu area

On Fri, Sep 19, 2008 at 11:37 PM, Christoph Lameter
<cl@...ux-foundation.org> wrote:
> SLUB now requires a portion of the per cpu reserve. There are on average
> about 70 real slabs on a system (aliases do not count) and each needs 12 bytes
> of per cpu space. Thats 840 bytes. In debug mode all slabs will be real slabs
> which will make us end up with 150 -> 1800. Give it some slack and add 2000
> bytes to the default size.
>
> Things work fine without this patch but then slub will reduce the percpu reserve
> for modules.

Hmm, shouldn't this be dynamically configured at runtime by
multiplying the number of possible CPUs with some constant?
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