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

[Christoph Lameter]

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.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/