2013/4/9 Peter Zijlstra <[email protected]>: > On Sat, 2013-04-06 at 18:45 +0200, Frederic Weisbecker wrote: >> check_preempt_wakeup() of fair class needs an uptodate sched clock >> value to update runtime stats of the current task. >> >> When a task is woken up, activate_task() is usually called right >> before >> ttwu_do_wakeup() unless the task is still in the runqueue. In this >> case we need to update the rq clock manually in case the CPU runs >> tickless because ttwu_do_wakeup() calls check_preempt_wakeup(). > > again, same story.. I think the entire nohz specific clock update stuff > is completely broken and you're finding sites that are simply missing > clock updates. >
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