Re: [PATCH 2/4] nohz: Synchronize sleep time stats with seqlock

[Arjan van de Ven]

On 8/20/2013 8:35 AM, Frederic Weisbecker wrote:
> On Tue, Aug 20, 2013 at 08:33:50AM -0700, Arjan van de Ven wrote:
> > 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.
>
> Are there other users than intel?

http://lxr.linux.no/linux+v3.10.7/drivers/cpufreq/cpufreq_ondemand.c#L69

nope
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