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SubjectRe: Page table sharing
> I'm not sure how relevant page table sharing has to the halloween 
> deadline since it's not a feature per se, just an optimization.
> It has more to do with getting numa ia32 boxes to survive, so it's
> an ideal out-of-tree patch.

Any large 32 bit box with significant numbers of processes will need
it to cope with the bloat that rmap introduced - this has nothing to
do with NUMA (some apps may be saved by large pages, some not).
Avoiding hangs from ZONE_NORMAL oom is not an "optimisation", and I
doubt optimisations involving major VM changes would be very welcome
after the freeze. This is something we need to get working ASAP ...


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