sched/fair: Update cpu_capacity to reflect thermal pressure
cpu_capacity initially reflects the maximum possible capacity of a CPU. Thermal pressure on a CPU means this maximum possible capacity is unavailable due to thermal events. This patch subtracts the average thermal pressure for a CPU from its maximum possible capacity so that cpu_capacity reflects the remaining maximum capacity. Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lkml.kernel.org/r/20200222005213.3873-8-thara.gopinath@linaro.org
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@ -7984,8 +7984,15 @@ static unsigned long scale_rt_capacity(struct sched_domain *sd, int cpu)
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if (unlikely(irq >= max))
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return 1;
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/*
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* avg_rt.util_avg and avg_dl.util_avg track binary signals
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* (running and not running) with weights 0 and 1024 respectively.
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* avg_thermal.load_avg tracks thermal pressure and the weighted
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* average uses the actual delta max capacity(load).
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*/
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used = READ_ONCE(rq->avg_rt.util_avg);
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used += READ_ONCE(rq->avg_dl.util_avg);
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used += thermal_load_avg(rq);
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if (unlikely(used >= max))
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return 1;
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