Messages in this thread | | | Subject | Re: [PATCH 1/7] sched: Update rq clock on nohz CPU before migrating tasks | From | Peter Zijlstra <> | Date | Tue, 09 Apr 2013 11:13:04 +0200 |
| |
On Sat, 2013-04-06 at 18:45 +0200, Frederic Weisbecker wrote: > Because the sched_class::put_prev_task() callback of rt and fair > classes are referring to the rq clock to update their runtime > statistics. A CPU running in tickless mode may carry a stale value. > We need to update it there.
I'm failing to see how tickless makes a difference here.. we should never rely on a ->clock set at the last tick, that's wrong.
So either explain which/how clock update gets lost by tickless or make it unconditional.
| |