Re: [PATCH v2 3/3] PM / EM: Skip inefficient OPPs

[Vincent Donnefort]

On Tue, May 25, 2021 at 09:33:01AM +0000, Quentin Perret wrote:
> On Friday 21 May 2021 at 17:54:24 (+0100), Vincent Donnefort wrote:
> > @@ -161,6 +162,8 @@ static int em_create_perf_table(struct device *dev, struct em_perf_domain *pd,
> >  		table[i].cost = div64_u64(fmax * table[i].power,
> >  					  table[i].frequency);
> >  		if (table[i].cost >= prev_cost) {
> > +			table[i].flags = EM_PERF_STATE_INEFFICIENT;
> > +			pd->flags |= EM_PERF_DOMAIN_INEFFICIENCIES;
> 
> If we're looking for micro-optimizations, then perhaps you could store
> the index of the next efficient OPP (which would be 'i' if the current
> OPP is already efficient), so you can jump to it directly when doing the
> search.

Wouldn't add any new field compared to this version so yeah it seems an
interesting improvement I could add for a next version.

> 
> >  			dev_dbg(dev, "EM: OPP:%lu is inefficient\n",
> >  				table[i].frequency);
> >  		} else {