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

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Message-ID: <Pine.LNX.4.64.0710091144020.32162@schroedinger.engr.sgi.com>
Date:	Tue, 9 Oct 2007 11:46:14 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Akinobu Mita <akinobu.mita@...il.com>
cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH -mm] slub: fix cpu hotplug offline/online path

On Wed, 10 Oct 2007, Akinobu Mita wrote:

> This patch removes init_alloc_cpu_cpu() from cpu hotplug notifier. But
> call it for each possible CPUs not only online CPUs at initialization time.

Could you check if a per cpu structure has already been allocated and then 
simply skip the call to init? Otherwise we end up with lots of per cpu 
structures for cpus that will never show up. 

if (!get_cpu_slab(s, cpu))
	init_alloc_cpu_cpu( ...)

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