On Thu, 17 Mar 2016, Peter Zijlstra wrote: > Also, maybe the tracer should measure the time from need_resched() > getting true until the next preemption point, instead of the entire time > preemption was disabled. Which would avoid the entire issue altogether.
Well, that only gives you the information on a actual preemption, but not
information about long preempt disabled regions which can cause a problem
eventually.
Thanks,
tglx
