A customer is using /proc/stat to track cpu usage in a VM and noted that the iowait and idle times behave strangely when a cpu goes offline and comes back online. This patchset addresses two issues that can cause iowait and idle to fluctuate up and down. With these changes, cpu iowait and idle now only monotonically increase. Tom Hromatka (2): tick-sched: Do not clear the iowait and idle times /proc/stat: Simplify iowait and idle calculations when cpu is offline fs/proc/stat.c | 24 ++++++------------------ kernel/time/tick-sched.c | 9 +++++++++ 2 files changed, 15 insertions(+), 18 deletions(-) -- 2.25.4
