On 11 May 2018 at 11:12, Patrick Bellasi <[email protected]> wrote:
>>
>> Do we need a Fixes tag and Cc stable ?
>
> Mmm... no sure, I would say that's not a fix.
>
> As I say in the changelog above, 8f111bc357aa was doing the correct
> thing but, since the recent Vincent's commit 31e77c93e432, this is an
> update worth to have, since now we can trust the decay of blocked
> utilization.
>
> Regarding stable, well... if Vincent patches are not going to be
> considered for stable, then we should not consider this too, do we?
commit 31e77c93e432 is not for stable so this patch should not go too
>
>> >
>> > diff --git a/kernel/sched/cpufreq_schedutil.c
>> > b/kernel/sched/cpufreq_schedutil.c
>> > index d2c6083304b4..a74d05160e66 100644
>> > --- a/kernel/sched/cpufreq_schedutil.c
>> > +++ b/kernel/sched/cpufreq_schedutil.c
>> > @@ -183,22 +183,21 @@ static void sugov_get_util(struct sugov_cpu *sg_cpu)
>> > static unsigned long sugov_aggregate_util(struct sugov_cpu *sg_cpu)
>> > {
>> > struct rq *rq = cpu_rq(sg_cpu->cpu);
>> > - unsigned long util;
>> >
>> > - if (rq->rt.rt_nr_running) {
>> > - util = sg_cpu->max;
>> > - } else {
>> > - util = sg_cpu->util_dl;
>> > - if (rq->cfs.h_nr_running)
>> > - util += sg_cpu->util_cfs;
>> > - }
>> > + if (rq->rt.rt_nr_running)
>> > + return sg_cpu->max;
>> >
>> > /*
>> > + * Utilization required by DEADLINE must always be granted while, for
>> > + * FAIR, we use blocked utilization of IDLE CPUs as a mechanism to
>> > + * gracefully reduce the frequency when no tasks show up for longer
>> > + * periods of time.
>> > + *
>> > * Ideally we would like to set util_dl as min/guaranteed freq and
>> > * util_cfs + util_dl as requested freq. However, cpufreq is not yet
>> > * ready for such an interface. So, we only do the latter for now.
>> > */
>> > - return min(util, sg_cpu->max);
>> > + return min(sg_cpu->max, (sg_cpu->util_dl + sg_cpu->util_cfs));
>> > }
>> >
>> > static void sugov_set_iowait_boost(struct sugov_cpu *sg_cpu, u64 time,
>> > unsigned int flags)
>>
>> Acked-by: Viresh Kumar <[email protected]>
>>
>> --
>> viresh
>
> --
> #include <best/regards.h>
>
> Patrick Bellasi
