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

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Message-ID: <alpine.DEB.2.00.0904071501570.32000@chino.kir.corp.google.com>
Date:	Tue, 7 Apr 2009 15:03:48 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Christoph Lameter <cl@...ux.com>
cc:	Pekka Enberg <penberg@...helsinki.fi>, linux-kernel@...r.kernel.org
Subject: Re: [patch] slub: default min_partial to at least highest cpus per
  node

On Tue, 7 Apr 2009, Christoph Lameter wrote:

> > Right, but right now allocating new slabs is extremely slow compared to
> > using a partial slab.
> 
> Work on the page allocator is in progress. So this is band aid until the
> work on the page allocator is complete. Maybe better focus on helping Mel?
> 

The page allocator may be getting significantly faster, but that is _not_ 
the only reason why we use partial slabs.  Higher order slabs, such as the 
default for kmalloc-2048, kmalloc-4096, etc., increase the liklihood of 
having cpu slabs at that order as opposed to order fallback with a 
sufficiently long uptime.
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