These are getting in the way now, and I need to make a go/no-go decision.

I have vague feelings of ickiness with the patches wrt:

a) general increase of complexity

b) the fact that they only partially address the problem: anonymous page
   faults are addressed, but lots of other places aren't.

c) the fact that they address one particular part of one particular
   workload on exceedingly rare machines.

I believe that Nick has plans to address b).

I'd like us to thrash this out (again), please.  Hugh, could you (for the
nth and final time) describe your concerns with these patches?

Thanks.

(Three patches attached)