Messages in this thread | | | Date | Thu, 30 Nov 2017 14:17:59 +0100 | From | Juri Lelli <> | Subject | Re: [PATCH v3 2/6] cpufreq: schedutil: ensure max frequency while running RT/DL tasks |
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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?
Best,
Juri
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