Currently schedutil enforces a maximum frequency when RT/DL tasks are
RUNNABLE. Such a mandatory policy can be made more tunable from
userspace thus allowing for example to define a max frequency which is
still reasonable for the execution of a specific RT/DL workload. This
will contribute to make the RT class more friendly for power/energy
sensitive use-cases.
This patch extends the usage of util_{min,max} to the RT/DL classes.
Whenever a task in these classes is RUNNABLE, the util required is
defined by the constraints of the CPU control group the task belongs to.
Signed-off-by: Patrick Bellasi <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rafael J. Wysocki <[email protected]>
Cc: [email protected]
Cc: [email protected]
---
kernel/sched/cpufreq_schedutil.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c
index f67c26bbade4..feca60c107bc 100644
--- a/kernel/sched/cpufreq_schedutil.c
+++ b/kernel/sched/cpufreq_schedutil.c
@@ -227,7 +227,10 @@ static void sugov_update_single(struct update_util_data
*hook, u64 time,
busy = sugov_cpu_is_busy(sg_cpu);
if (flags & SCHED_CPUFREQ_RT_DL) {
- next_f = policy->cpuinfo.max_freq;
+ util = uclamp_util(smp_processor_id(), SCHED_CAPACITY_SCALE);
+ next_f = (uclamp_enabled && util < SCHED_CAPACITY_SCALE)
+ ? get_next_freq(sg_policy, util,
policy->cpuinfo.max_freq)
+ : policy->cpuinfo.max_freq;
} else {
sugov_get_util(&util, &max);
sugov_iowait_boost(sg_cpu, &util, &max);
@@ -276,10 +279,15 @@ static unsigned int sugov_next_freq_shared(struct
sugov_cpu *sg_cpu, u64 time)
j_sg_cpu->iowait_boost = 0;
continue;
}
- if (j_sg_cpu->flags & SCHED_CPUFREQ_RT_DL)
- return policy->cpuinfo.max_freq;
- j_util = j_sg_cpu->util;
+ if (j_sg_cpu->flags & SCHED_CPUFREQ_RT_DL) {
+ if (!uclamp_enabled)
+ return policy->cpuinfo.max_freq;
+ j_util = uclamp_util(j, SCHED_CAPACITY_SCALE);
+ } else {
+ j_util = j_sg_cpu->util;
+ }
+
j_max = j_sg_cpu->max;
if (j_util * max > j_max * util) {
util = j_util;
--
2.14.1
