linux-kernel - Re: [PATCH -mm] slub: fix cpu hotplug offline/online path

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Message-ID: <Pine.LNX.4.64.0710091212350.1812@schroedinger.engr.sgi.com>
Date:	Tue, 9 Oct 2007 12:15:58 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Pekka Enberg <penberg@...helsinki.fi>
cc:	Akinobu Mita <akinobu.mita@...il.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>, travis@....com
Subject: Re: [PATCH -mm] slub: fix cpu hotplug offline/online path

On Tue, 9 Oct 2007, Pekka Enberg wrote:

> Hi Christoph,
> 
> On 10/9/07, Christoph Lameter <clameter@....com> wrote:
> > Our system come by default with the possibility of 1k cpus. However, a
> > small system may only have 8 cpus.
> 
> Maybe I am reading the code wrong, but I don't why that matters as
> it's all statically allocated anyway (the per-cpu kmem_cache_cpu
> array). In any case, I certainly don't object to your proposal, just
> can't figure out why it matters.

The kmem_cache_cpu structures are allocated using DEFINE_PER_CPU. 

The per cpu areas should be dynamically allocated as necessary. There is 
work in progress by Mike Travis to do that. You are right in that (on 
x86_64 at least) we define a static array for all processors.
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