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    SubjectRe: [RFC 00/15] x86_64: Optimize percpu accesses
    Christoph Lameter wrote:
    > Jeremy Fitzhardinge wrote:
    >
    >
    >> You want to virtually map the percpu area? How and when would it get
    >> extended?
    >>
    >
    > It would get extended when cpu_alloc() is called and the allocator finds that there is no per cpu memory available.
    >

    Which, I take it, allocates percpu memory. It would have the same
    caveats as vmalloc memory, with respect to accessing it during fault
    handlers and nmi handlers, I take it.

    How would cpu_alloc() actually get used? It doesn't make much sense for
    general code, since we don't have the notion of a percpu pointer to
    memory (vs a pointer to percpu memory). Is the intended use for
    allocating percpu memory in modules? What other uses?

    J


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