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    SubjectRe: [rfc 00/45] [RFC] CPU ops and a rework of per cpu data handling on x86_64
    Date

    > Although we have a per-cpu area base in a fixed global register
    > for addressing, the above isn't beneficial on sparc64 because
    > the atomic is much slower than doing a:
    >
    > local_irq_disable();
    > nonatomic_percpu_memory_op();
    > local_irq_enable();

    Again might be pointing out the obvious, but you
    need of course save_flags()/restore_flags(), not disable/enable().

    If it was just disable/enable x86 could do it much faster too
    and Christoph probably would never felt the need to approach
    this project for his SLUB fast path.

    -Andi
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