Messages in this thread | | | Date | Wed, 1 Jul 2009 01:31:06 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCHSET] percpu: generalize first chunk allocators and improve lpage NUMA support |
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* Tejun Heo <tj@kernel.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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