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

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Date:	Wed, 1 Jul 2009 01:31:06 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Tejun Heo <tj@...nel.org>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	linux-arch@...r.kernel.org, andi@...stfloor.org, hpa@...or.com,
	tglx@...utronix.de
Subject: Re: [PATCHSET] percpu: generalize first chunk allocators and
	improve lpage NUMA support


* Tejun Heo <tj@...nel.org> wrote:

> Hello, Christoph.
> 
> Christoph Lameter wrote:

> > I looked at allocating for online cpus only a couple of years 
> > back but at that per cpu state was kept for offlined cpus in per 
> > cpu areas. There are numerous assumptions in per cpu handling 
> > all over the kernel that a percpu area is always available.
> 
> The plan is to allocate and keep percpu areas for cpus which have 
> ever been up.  There'll be no taking down of percpu areas.  
> Conversion from possible to has_ever_been_up should be much easier 
> than possible -> online.  State keeping will work fine too.

That sounds like a very sane plan.

	Ingo
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