On Tue, 16 Jul 2019, Paul Thomas wrote: > > > We do have trace data for a instance where cyclictest hit 5000 uS, but > > > the file is large 11MB, and I wasn't sure if I should directly attach > > > it to the email. What is the best way to post or send this? > > > > Can you upload the trace to some place? If you don't have storage, just use > > bugzilla.kernel.org and open a bug, attach it and post a reference. > > Hi Thomas, > > I've put the last 60k line of the trace on the bug report here: > https://bugzilla.kernel.org/show_bug.cgi?id=204189 > > Just looking at the timestamp time of cyclicte-2778 I can see the last > two finish_task_switch calls are seperated by 5801 uS. Is just before > that the correct place to be looking? Right. If I'm reading it correctly, I think I know what's wrong. Can you please revert: 80e7f3b05365 ("arch/arm64: Add lazy preempt support") Either that patch is broken or it got broken on forward porting it from 4.19. Need to look with brain awake tomorrow. Thanks, tglx
