btt: Added in I/O activity per device and system-wide
It now keeps track of I/O activity on a per-device basis (as well as a
cumulative system-wide view). ``I/O activity'' is defined as defined as
the time during which the device driver and device are activelty working
on at least one I/O. Here's a sample output:
==================== I/O Active Period Information ====================
DEV | # Live Avg. Act Avg. !Act % Live
---------- | ---------- ------------- ------------- ------
(254, 0) | 0 0.000000000 0.000000000 0.00
( 8, 17) | 0 0.000000000 0.000000000 0.00
( 8, 16) | 29 0.909596815 0.094646263 90.87
( 8, 33) | 0 0.000000000 0.000000000 0.00
( 8, 32) | 168 0.097848226 0.068231948 59.06
---------- | ---------- ------------- ------------- ------
Total Sys | 33 0.799808811 0.082334758 90.92
Also added a new btt -Z option that generates per-device and system-wide
I/O activity data that can be plotted.
Refer to the documentation updates (btt.1, btt.tex) for more information.
13 files changed
