cpufreq: conservative: Fix sampling_down_factor functionality
sampling_down_factor tunable is unused since commit
8e677ce83b
(4 years ago).
This patch restores the original functionality and documents the
tunable.
Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
parent
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@ -191,6 +191,12 @@ governor but for the opposite direction. For example when set to its
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default value of '20' it means that if the CPU usage needs to be below
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20% between samples to have the frequency decreased.
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sampling_down_factor: similar functionality as in "ondemand" governor.
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But in "conservative", it controls the rate at which the kernel makes
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a decision on when to decrease the frequency while running in any
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speed. Load for frequency increase is still evaluated every
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sampling rate.
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3. The Governor Interface in the CPUfreq Core
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=============================================
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@ -36,9 +36,9 @@ static DEFINE_PER_CPU(struct cs_cpu_dbs_info_s, cs_cpu_dbs_info);
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/*
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* Every sampling_rate, we check, if current idle time is less than 20%
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* (default), then we try to increase frequency Every sampling_rate *
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* sampling_down_factor, we check, if current idle time is more than 80%, then
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* we try to decrease frequency
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* (default), then we try to increase frequency. Every sampling_rate *
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* sampling_down_factor, we check, if current idle time is more than 80%
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* (default), then we try to decrease frequency
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*
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* Any frequency increase takes it to the maximum frequency. Frequency reduction
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* happens at minimum steps of 5% (default) of maximum frequency
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@ -81,6 +81,11 @@ static void cs_check_cpu(int cpu, unsigned int load)
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return;
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}
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/* if sampling_down_factor is active break out early */
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if (++dbs_info->down_skip < cs_tuners->sampling_down_factor)
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return;
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dbs_info->down_skip = 0;
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/*
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* The optimal frequency is the frequency that is the lowest that can
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* support the current CPU usage without triggering the up policy. To be
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