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    SubjectRe: [PATCH 1/7] x86-64: introduce fast variant of smp_call_function_single()
    On Fri, Mar 14 2008, Jeremy Fitzhardinge wrote:
    > Jens Axboe wrote:
    > >rom: Nick Piggin <npiggin@suse.de>
    > >
    >
    > Why is this necessary? How is smp_call_function_single slow?

    Because it's completely serialized by the call_lock spinlock.

    --
    Jens Axboe



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