Fields
- free_count: u32
- active_count: u32
- inactive_count: u32
- wire_count: u32
- zero_fill_count: u32
- reactivations: u32
- pageins: u32
- pageouts: u32
- faults: u32
- cow_faults: u32
- lookups: u32
- hits: u32
- purgeable_count: u32
- purges: u32
- speculative_count: u32