Messages in this thread | | | Date | Fri, 2 Nov 2007 16:25:29 +0100 | From | Ingo Molnar <> | Subject | Re: delayacct regression in 2.6.24 git |
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* Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
> 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()?
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