Christoph Lameter <[email protected]> wrote:
>
> 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.
I think Hugh did some instrumentation on that and decided that problems
were unlikely?
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