Physical memory

[matthew sporleder <msporleder%gmail.com@localhost>]

So I have a theory that physical memory use could be calculated with
hw.physmem64 - (vm.uvmexp->pagesize * vm.uvmexp->active)  Is this
correct?

Active and free change accordingly when I malloc from userland, npages
* pagesize is also pretty close to physical memory, so is this a good
way to report on physical memory use?  Is kernel memory use
accounted-for in these?

Matt