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    SubjectRe: [PATCH 10/15] mm: atomic64 page counts
    On Wed, 9 Nov 2005, Andrew Morton wrote:

    > > I'm quite pleased with the way it's worked out, but you were intending
    > > that the 64-bit arches should get along with 32-bit counts? Maybe.
    >
    > That seems reasonsable for file pages. For the ZERO_PAGE the count can do
    > whatever it wants, because we'd never free them up.

    Frequent increments and decrements on the zero page count can cause a
    bouncing cacheline that may limit performance.

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