Re: [PATCH v3 0/6] cpufreq: schedutil: fixes for flags updates

[Peter Zijlstra]

On Fri, Dec 22, 2017 at 11:02:06AM +0000, Patrick Bellasi wrote:
> > @@ -315,8 +315,8 @@ static unsigned int sugov_next_freq_shared(struct sugov_cpu *sg_cpu, u64 time)
> >  		unsigned long j_util, j_max;
> >  		s64 delta_ns;
> >  
> > -		if (j_sg_cpu != sg_cpu)
> > -			sugov_get_util(j_sg_cpu);
> > +		if (idle_cpu(j))
> > +			continue;
> 
> That should work to skip IDLE CPUs... however I'm missing where now we
> get the sugov_get_util(j_sg_cpu) for active CPUs. It has been moved
> somewhere else I guess...

No, I'm just an idiot... lemme fix that.

> Moreover, that way don't we completely disregard CFS blocked load for
> IDLE CPUs... as well as DL reserved utilization, which should be
> released only at the 0-lag time?

I was thinking that since dl is a 'global' scheduler the reservation
would be too and thus the freq just needs a single CPU to be observed;
but I suppose there's nothing stopping anybody from splitting a clock
domain down the middle scheduling wise. So yes, good point.

Blergh that'd make a mess of things again.