On Sat, 5 Mar 2016, Chris Friesen wrote: > The callers of steal_account_process_tick() expect it to return > whether a jiffy should be considered stolen or not. > > Currently the return value of steal_account_process_tick() is in > units of cputime, which vary between either jiffies or nsecs > depending on CONFIG_VIRT_CPU_ACCOUNTING_GEN. > > If cputime has nsecs granularity and there is a tiny amount of > stolen time (a few nsecs, say) then we will consider the entire > tick stolen and will not account the tick on user/system/idle, > causing /proc/stats to show invalid data. > > The fix is to change steal_account_process_tick() to accumulate > the stolen time and only account it once it's worth a jiffy. > > (Thanks to Frederic Weisbecker for suggestions to fix a bug in my > first version of the patch.) > > Signed-off-by: Chris Friesen <chris.frie...@windriver.com>
Reviewed-by: Thomas Gleixner <t...@linutronix.de>
