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    Subject[Patch v6 5/7] sched/fair: update cpu_capacity to reflect thermal pressure
    Date
    cpu_capacity relflects the maximum available capacity of a cpu. Thermal
    pressure on a cpu means this maximum available capacity is reduced. This
    patch reduces the average thermal pressure for a cpu from its maximum
    available capacity so that cpu_capacity reflects the actual
    available capacity.

    Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
    ---
    kernel/sched/fair.c | 7 +++++++
    1 file changed, 7 insertions(+)

    diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
    index e12a375..4840655 100644
    --- a/kernel/sched/fair.c
    +++ b/kernel/sched/fair.c
    @@ -7725,8 +7725,15 @@ 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 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.
    + */
    used = READ_ONCE(rq->avg_rt.util_avg);
    used += READ_ONCE(rq->avg_dl.util_avg);
    + used += READ_ONCE(rq->avg_thermal.load_avg);

    if (unlikely(used >= max))
    return 1;
    --
    2.1.4
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