On Mon, Oct 01, 2012 at 10:33:12AM -0700, H. Peter Anvin wrote:

... and I think it would be worthwhile to know which effect dominates
(or neither, in which case it doesn't matter).

Overall, I'm okay with either as long as we don't lock down 2 MB when
there isn't a huge zero page in use.

Same here.

I agree the cmpxchg idea to free the 2M zero page, was a very nice
addition to the physical zero page patchset.

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