Describes how/when the information exported to `/proc/stat' is calculated,
and possible problems with this approach.
Signed-off-by: NVassili Karpov <av1474@comtv.ru>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>