Re: [PATCH 3/7] sched: Update rq clock on tickless CPUs beforecalling check_preempt_curr()

[Peter Zijlstra]

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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