On Thu, Apr 21, 2016 at 09:09:43AM +0800, Wanpeng Li wrote: > >> Sometimes .update_curr hook is called w/o tasks actually running, it is > >> captured by: > >> > >> u64 delta_exec = rq_clock_task(rq) - curr->se.exec_start; > >> > >> We should not trigger cpufreq update in this case for rt/deadline > >> classes, and this patch fix it.
> I add a print to print when delta_exec is zero for rt class, something So its zero, so what? > like below: > watchdog/5-48 [005] d... 568.449105: update_curr_rt: rt > delta_exec is zero > watchdog/5-48 [005] d... 568.449111: <stack trace> > => put_prev_task_rt > => pick_next_task_idle So we'll go idle, but as of this point we're still running the rt task. So your Changelog is actively wrong, the tasks _are_ still running, albeit not for very much longer.
