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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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