Re: [PATCH 10/15] mm: atomic64 page counts

[Andrew Morton]

Christoph Lameter <clameter@xxxxxxxxxxxx> 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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