linux-kernel - Re: [PATCHSET] percpu: generalize first chunk allocators and improve lpage NUMA support

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Message-Id: <20090629163937.94c8cedd.akpm@linux-foundation.org>
Date:	Mon, 29 Jun 2009 16:39:37 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	tj@...nel.org, linux-kernel@...r.kernel.org, x86@...nel.org,
	linux-arch@...r.kernel.org, mingo@...e.hu, andi@...stfloor.org,
	hpa@...or.com, tglx@...utronix.de
Subject: Re: [PATCHSET] percpu: generalize first chunk allocators and
 improve lpage NUMA support

On Mon, 29 Jun 2009 19:20:53 -0400 (EDT)
Christoph Lameter <cl@...ux-foundation.org> wrote:

> On Wed, 24 Jun 2009, Andrew Morton wrote:
> 
> > I assume from the tremendous number of for_each_possible_cpu()s that
> > CPU hotplug awareness won't be happening.
> 
> Per cpu areas are allocated for all possible processors. No need to handle
> offlining and onlining them.

Well yes.  My point is that this is a bug-not-a-feature ;)
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