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have pv_entries. This is intended for very special circumstances, eg: a certain database that has a 1GB shm segment mapped into 300 processes. That would consume 2GB of kvm just to hold the pv_entries alone. This would not be used on systems unless the physical ram was available, as it's not pageable. This is a work-in-progress, but is a useful and functional checkpoint. Matt has got some more fixes for it that will be committed soon. Reviewed by: dillon