This patch accounts steal time time in kernel/sched.
I kept it from last proposal, because I still see advantages
in it: Doing it here will give us easier access from scheduler
variables such as the cpu rq. The next patch shows an example of
usage for it.
Since functions like account_idle_time() can be called from
multiple places, not only account_process_tick(), steal time
grabbing is repeated in each account function separatedely.
Signed-off-by: Glauber Costa<glommer@xxxxxxxxxx>
CC: Rik van Riel<riel@xxxxxxxxxx>
CC: Jeremy Fitzhardinge<jeremy.fitzhardinge@xxxxxxxxxx>
CC: Peter Zijlstra<peterz@xxxxxxxxxxxxx>
CC: Avi Kivity<avi@xxxxxxxxxx>