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cpufreq: schedutil: Use policy-dependent transition delays

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Make the schedutil governor take the initial (default) value of the
rate_limit_us sysfs attribute from the (new) transition_delay_us
policy parameter (to be set by the scaling driver).

That will allow scaling drivers to make schedutil use smaller default
values of rate_limit_us and reduce the default average time interval
between consecutive frequency changes.

Make intel_pstate set transition_delay_us to 500.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Rafael J. Wysocki
2017-04-11 00:20:41 +02:00
parent 5ed8a1c19d
commit 1b72e7fd30
3 changed files with 19 additions and 5 deletions
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15
kernel/sched/cpufreq_schedutil.c
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@@ -494,7 +494,6 @@ static int sugov_init(struct cpufreq_policy *policy)
{
struct sugov_policy *sg_policy;
struct sugov_tunables *tunables;
unsigned int lat;
int ret = 0;
/* State should be equivalent to EXIT */
@@ -533,10 +532,16 @@ static int sugov_init(struct cpufreq_policy *policy)
goto stop_kthread;
}
tunables->rate_limit_us = LATENCY_MULTIPLIER;
lat = policy->cpuinfo.transition_latency / NSEC_PER_USEC;
if (lat)
tunables->rate_limit_us *= lat;
if (policy->transition_delay_us) {
tunables->rate_limit_us = policy->transition_delay_us;
} else {
unsigned int lat;
tunables->rate_limit_us = LATENCY_MULTIPLIER;
lat = policy->cpuinfo.transition_latency / NSEC_PER_USEC;
if (lat)
tunables->rate_limit_us *= lat;
}
policy->governor_data = sg_policy;
sg_policy->tunables = tunables;