Messages in this thread |  | | | Date | Tue, 30 Jun 2009 21:15:17 +0200 | | From | Ingo Molnar <> | | Subject | Re: [PATCHSET] percpu: generalize first chunk allocators and improve lpage NUMA support |
* Andrew Morton <akpm@linux-foundation.org> wrote:
> On Mon, 29 Jun 2009 19:20:53 -0400 (EDT) > Christoph Lameter <cl@linux-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 ;)
Yeah, it's a bug for something like a virtual environment which boots generic kernels that might have 64 possible CPUs (on a true 64-way system), but which will have fewer in practice.
It's pretty basic stuff: the on-demand allocation of percpu resources.
Ingo
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