foo:~# free -m
             total       used       free     shared    buffers     cached
Mem:           120         60         60          0          6         14
-/+ buffers/cache:         39         81
Swap:          255         69        186
foo:~# vmstat
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id wa
 0  0  71500  61876   6352  15008    1    1     5     6  110    28  0  0 100  0
foo:~# cat /proc/io_status
io_count=889587 io_rate=0 io_tokens=400000 token_refill=512 token_max=400000