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    SubjectRe: [PATCH] Per cpu irq stat
    On Mon, Mar 14, 2005 at 10:32:34PM -0800, Christoph Lameter wrote:
    > The definition of the irq_stat as an array means that the individual
    > elements of the irq_stat array are located on one NUMA node requiring
    > internode traffic to access irq_stat from other nodes. This patch makes
    > irq_stat a per_cpu variable which allows most accesses to be local.

    There's architectures accessing it from assemly.

    But furthermore there's absolutely not point for the irq_stat structure
    at all anymore now that we have the per_cpu infrastructure. so kill it
    completely and let every architecture just provide a local_softirq_pending
    macro.

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