$FreeBSD: head/usr.bin/top/top.local.1 215239 2010-11-13 11:43:20Z brucec $
The '-H' option will toggle the display of kernel visible thread contexts. At runtime the 'H' key will toggle this mode. The default is OFF. Mem: 9220K Active, 1032K Inact, 3284K Wired, 1M Cache, 2M Buf, 1320K Free Swap: 91M Total, 79M Free, 13% Inuse, 80K In, 104K Out K: Kilobyte

M: Megabyte

%: 1/100

Active: number of bytes active

Inact: number of bytes inactive

Wired: number of bytes wired down, including cached file data pages

Cache: number of clean bytes caching data that are available for immediate reallocation

Buf: number of bytes used for BIO-level disk caching

Free: number of bytes free

Total: total available swap usage

Free: total free swap usage

Inuse: swap usage

In: bytes paged in from swap devices (last interval)

Out: bytes paged out to swap devices (last interval)