Messages in this thread | | | Date | Thu, 30 Nov 2017 17:03:45 +0100 | From | Juri Lelli <> | Subject | Re: [PATCH v3 2/6] cpufreq: schedutil: ensure max frequency while running RT/DL tasks |
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On 30/11/17 15:45, Patrick Bellasi wrote: > On 30-Nov 14:17, Juri Lelli wrote: > > Hi, > > > > On 30/11/17 11:47, Patrick Bellasi wrote: > > > > [...] > > > > > @@ -340,6 +349,7 @@ static void sugov_update_shared(struct update_util_data *hook, u64 time, > > > struct sugov_policy *sg_policy = sg_cpu->sg_policy; > > > unsigned long util, max; > > > unsigned int next_f; > > > + bool rt_mode; > > > > > > sugov_get_util(&util, &max, sg_cpu->cpu); > > > > > > @@ -353,17 +363,27 @@ static void sugov_update_shared(struct update_util_data *hook, u64 time, > > > sg_cpu->flags = 0; > > > goto done; > > > } > > > - sg_cpu->flags = flags; > > > + > > > + /* > > > + * While RT/DL tasks are running we do not want FAIR tasks to > > > + * overwrite this CPU's flags, still we can update utilization and > > > + * frequency (if required/possible) to be fair with these tasks. > > > + */ > > > + rt_mode = task_has_dl_policy(current) || > > > + task_has_rt_policy(current) || > > > + (flags & SCHED_CPUFREQ_RT_DL); > > > + if (rt_mode) > > > + sg_cpu->flags |= flags; > > > + else > > > + sg_cpu->flags = flags; > > > > > > sugov_set_iowait_boost(sg_cpu, time, flags); > > > sg_cpu->last_update = time; > > > > > > if (sugov_should_update_freq(sg_policy, time)) { > > > - if (flags & SCHED_CPUFREQ_RT_DL) > > > - next_f = sg_policy->policy->cpuinfo.max_freq; > > > - else > > > - next_f = sugov_next_freq_shared(sg_cpu, time); > > > - > > > + next_f = rt_mode > > > + ? sg_policy->policy->cpuinfo.max_freq > > > + : sugov_next_freq_shared(sg_cpu, time); > > > sugov_update_commit(sg_policy, time, next_f); > > > > Aren't we already at max_freq at this point (since an RT/DL task is > > running)? Do we need to trigger a frequency update? > > I think that's required to cover the first time we enter rt_mode in > order to jump to max OPP. > > If we are already at max OPP, sugov_update_commit() will just bail out > without doing anything.
Indeed!
Best,
Juri
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