Re: [PATCHSET] percpu: generalize first chunk allocators andimprove lpage NUMA support

[Ingo Molnar]

* Tejun Heo <tj@xxxxxxxxxx> 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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