On Thu, 21 Jan 2016, Shiraz Hashim wrote: > > On idle we fold counters immediately. So there is no loss of accuracy. > > vmstat is scheduled by shepherd or by itself (conditionally). In case shepherd > is deferred and vmstat doesn't schedule itself, then vmstat needs to wait > for shepherd to be up and then schedule it. This may end up in delayed status > update for all live cpus. Isn't it ?
The shepherd runs on a processor with an active tick and thus should do its duty every 2 seconds as scheduled. Small milisecond range deferrals do not matter much.
