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From: "Pekka Enberg" <penberg@cs.helsinki.fi>
To: "Christoph Lameter" <cl@linux-foundation.org>
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org, jeremy@goop.org, ebiederm@xmission.com,
	travis@sgi.com, herbert@gondor.apana.org.au, xemul@openvz.org
Subject: Re: [patch 3/3] Increase default reserve percpu area
Date: Sat, 20 Sep 2008 01:07:55 +0300	[thread overview]
Message-ID: <84144f020809191507w64ff1c47m40c2c500da3fdfa6@mail.gmail.com> (raw)
In-Reply-To: <84144f020809191502i35805980n97dc3073ab8a52bc@mail.gmail.com>

On Sat, Sep 20, 2008 at 1:02 AM, Pekka Enberg <penberg@cs.helsinki.fi> wrote:
> On Fri, Sep 19, 2008 at 11:37 PM, Christoph Lameter
> <cl@linux-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.

  reply	other threads:[~2008-09-19 22:08 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-09-19 20:37 [patch 0/3] Cpu alloc slub support: Replace percpu allocator in slub.c Christoph Lameter
2008-09-19 20:37 ` [patch 1/3] cpu alloc: Use in slub Christoph Lameter
2008-09-19 20:37 ` [patch 2/3] cpu alloc: Remove slub fields Christoph Lameter
2008-10-01 17:53   ` Pekka Enberg
2008-10-02 16:21     ` Christoph Lameter
2008-09-19 20:37 ` [patch 3/3] Increase default reserve percpu area Christoph Lameter
2008-09-19 22:02   ` Pekka Enberg
2008-09-19 22:07     ` Pekka Enberg [this message]
2008-09-19 21:57 ` [patch 0/3] Cpu alloc slub support: Replace percpu allocator in slub.c Pekka Enberg

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