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

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Date:	Sat, 20 Sep 2008 01:07:55 +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 Sat, Sep 20, 2008 at 1:02 AM, Pekka Enberg <penberg@...helsinki.fi> wrote:
> 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?

Oh, never mind, setup_per_cpu_areas() already does that, obviously.
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