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b03f1ba3d5
Implements cpufreq_scale_max_freq_capacity() to provide the scheduler with a maximum frequency scaling correction factor for more accurate load-tracking and cpu capacity handling by being able to deal with frequency capping. This scaling factor describes the influence of running a cpu with a current maximum frequency lower than the absolute possible maximum frequency on load tracking and cpu capacity. The factor is: current_max_freq(cpu) << SCHED_CAPACITY_SHIFT / max_freq(cpu) In fact, max_freq_scale should be a struct cpufreq_policy data member. But this would require that the scheduler hot path (__update_load_avg()) would have to grab the cpufreq lock. This can be avoided by using per-cpu data initialized to SCHED_CAPACITY_SCALE for max_freq_scale. Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>