* Balbir Singh <balbir@linux.vnet.ibm.com> wrote:

quoted text
> Hi, Ingo,
> 
> I missed commit 75d4ef16a6aa84f708188bada182315f80aab6fa
> "sched: fix delay accounting performance regression"
> 
> Without these changes, I find that delay accounting does
> not work as expected, I see zeros in the field for virtual,delay
> and count(s).
> 
> CPU             count     real total  virtual total    delay total
>                     0      535861848              0              0
> 
> 
> This breaks existing delay accounting behaviour.
> 
> Am I missing something?

delay accounting was causing context-switch slowdown because it called 
sched_clock() explicitly - but indeed my fix to that is wrong ...

how about reverting the change but also using rq->clock instead of 
sched_clock()?

	Ingo
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