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    SubjectRe: [PATCH 22/25] Generic dynamic per cpu refcounting
    On Thu, Nov 29, 2012 at 10:57:20AM -0800, Kent Overstreet wrote:
    > On Thu, Nov 29, 2012 at 10:45:04AM -0800, Andi Kleen wrote:
    > > Kent Overstreet <koverstreet@google.com> writes:
    > >
    > > > This implements a refcount with similar semantics to
    > > > atomic_get()/atomic_dec_and_test(), that starts out as just an atomic_t
    > > > but dynamically switches to per cpu refcounting when the rate of
    > > > gets/puts becomes too high.
    > >
    > > This will only work if you put on the same CPU as you get, right?
    >
    > Nope, no such restriction.

    I don't see how you ensure you're doing the __this_cpu_dec on the same
    CPU as you did the get

    -Andi


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