linux-kernel - Re: [patch] slub: default min_partial to at least highest cpus per node

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Message-ID: <49DBB929.4080205@cs.helsinki.fi>
Date:	Tue, 07 Apr 2009 23:35:53 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	David Rientjes <rientjes@...gle.com>
CC:	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] slub: default min_partial to at least highest cpus per
  node

David Rientjes wrote:
> On Tue, 7 Apr 2009, Pekka Enberg wrote:
> 
>>> If you think that's acceptable, I'd be just as satisfied with that approach
>>> as long as all archs have valid cpu_to_node() mappings at the time of
>>> CPU_UP_PREPARE.
>> Well, that doesn't change the current behavior, so sure, I think it's
>> acceptable. And if the new defaults seem reasonable enough, we can probably
>> get rid of the tunable altogether.
> 
> I'd like to remove MAX_PARTIAL and replace it with nr_cpu_ids.

Yeah, something more dynamic makes sense. But we probably need to do 
ilog2(nr_cpu_ids) or something; otherwise we will have very long partial 
lists on big iron machines (think 4096 cpus here).
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