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    SubjectRe: [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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