Messages in this thread | | | Date | Tue, 20 Aug 2013 08:33:50 -0700 | From | Arjan van de Ven <> | Subject | Re: [PATCH 2/4] nohz: Synchronize sleep time stats with seqlock |
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On 8/20/2013 8:29 AM, Frederic Weisbecker wrote:
>> >> Of course, if we can get away with completely removing all of that >> (which I think Arjan suggested was a real possibility) then that would >> be ever so much better still :-) > > Would be lovely. But I don't know much about cpufreq, I hope somebody who's > familiar with that code can handle this. Then once there are no more users > of get_cpu_iowait_sleep_time() I can simply zap and clean the tick/time related > code.
it's just doing the "idle = 100 - busy% - iowait%" calculation. (with the later part only for Intel cpus iirc)
in a perfect world the scheduler would be doing that calculation in the first place ;-)
removing the later part will impact performance some on specific workloads, but most Intel cpus that this applies to should not be using cpufreq anymore anyway.
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