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    SubjectRe: [PATCH] percpu: add optimized generic percpu accessors
    Ingo Molnar <> wrote:
    >> Of course. But do any architectures actually _need_ that for a single
    >> read?
    > not for a read i guess - but for the other ops like add/and/or/xor.

    One of the things I'd like to see happen with this work is for
    us to have a cheap per-cpu atomic counter that we can use for
    SNMP stats.

    If we can make the inc/add variants into a single instruction,
    then it won't need to disable preemption or interrupts.

    So if you could design the API such that we have a variant of
    add/inc that automatically disables/enables preemption then we
    can optimise that away on x86.

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