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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-03-22 02:51:56 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-04-02 01:09:02 +0200 |
| commit | 379480d8258056bfdbaa65e4d3f024bb5b34b52b (patch) | |
| tree | 306ae7c944e19e2763dbb54c1187b6db96f1a257 /include/linux/cpufreq.h | |
| parent | 66893b6ac9952ec9d9409e9d85eaacf37bba8d15 (diff) | |
| download | talos-obmc-linux-379480d8258056bfdbaa65e4d3f024bb5b34b52b.tar.gz talos-obmc-linux-379480d8258056bfdbaa65e4d3f024bb5b34b52b.zip | |
cpufreq: Move governor symbols to cpufreq.h
Move definitions of symbols related to transition latency and
sampling rate to include/linux/cpufreq.h so they can be used by
(future) goverernors located outside of drivers/cpufreq/.
No functional changes.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'include/linux/cpufreq.h')
| -rw-r--r-- | include/linux/cpufreq.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index 74f5cfff2b52..2b4f248b8ef1 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -426,6 +426,20 @@ static inline unsigned long cpufreq_scale(unsigned long old, u_int div, #define CPUFREQ_POLICY_POWERSAVE (1) #define CPUFREQ_POLICY_PERFORMANCE (2) +/* + * The polling frequency depends on the capability of the processor. Default + * polling frequency is 1000 times the transition latency of the processor. The + * ondemand governor will work on any processor with transition latency <= 10ms, + * using appropriate sampling rate. + * + * For CPUs with transition latency > 10ms (mostly drivers with CPUFREQ_ETERNAL) + * the ondemand governor will not work. All times here are in us (microseconds). + */ +#define MIN_SAMPLING_RATE_RATIO (2) +#define LATENCY_MULTIPLIER (1000) +#define MIN_LATENCY_MULTIPLIER (20) +#define TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000) + /* Governor Events */ #define CPUFREQ_GOV_START 1 #define CPUFREQ_GOV_STOP 2 |
