Your new "behavior" flag isn't known by vm_map_simply_entry, so
map simplification could drop the behavior setting on the floor.
I would prefer that the behavior is folded into eflags.
Overall, I agree with the direction. Behavior is correctly a map
attribute rather than an object attribute.
Alan
P.S. The MADV_FREE's by malloc/free were disabled by default in -CURRENT
and -STABLE prior to the release of 3.2. They were a performance
pessimization, slowing down "make world" by ~2%.
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