steal (since Linux 2.6.11)
(8) Stolen time, which is the time spent in
other operating systems when running in a virtu‐
alized environment
guest (since Linux 2.6.24)
(9) Time spent running a virtual CPU for guest
operating systems under the control of the Linux
kernel.
guest_nice (since Linux 2.6.33)
(10) Time spent running a niced guest (virtual
CPU for guest operating systems under the con‐
trol of the Linux kernel).
Previously only CPU entries with a single digit (0..9) were parsed.
The improved regular expression simplifies the calculation of the CPU
count, since the combined entry ("cpu" without digits) is skipped.