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sched/fair: Update cpu_capacity to reflect thermal pressure

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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
This commit is contained in:
Thara Gopinath 2020-02-21 19:52:11 -05:00 committed by Ingo Molnar
parent b4eccf5f8e
commit 467b7d01c4
1 changed files with 7 additions and 0 deletions
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7
kernel/sched/fair.c
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@ -7984,8 +7984,15 @@ static unsigned long scale_rt_capacity(struct sched_domain *sd, int cpu)
if (unlikely(irq >= max))
return 1;
/*
* avg_rt.util_avg and avg_dl.util_avg track binary signals
* (running and not running) with weights 0 and 1024 respectively.
* avg_thermal.load_avg tracks thermal pressure and the weighted
* average uses the actual delta max capacity(load).
*/
used = READ_ONCE(rq->avg_rt.util_avg);
used += READ_ONCE(rq->avg_dl.util_avg);
used += thermal_load_avg(rq);
if (unlikely(used >= max))
return 1;