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    Subject[RFCv4 PATCH 19/34] sched: Compute cpu capacity available at current frequency
    Date
    capacity_orig_of() returns the max available compute capacity of a cpu.
    For scale-invariant utilization tracking and energy-aware scheduling
    decisions it is useful to know the compute capacity available at the
    current OPP of a cpu.

    cc: Ingo Molnar <mingo@redhat.com>
    cc: Peter Zijlstra <peterz@infradead.org>

    Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com>
    ---
    kernel/sched/fair.c | 11 +++++++++++
    1 file changed, 11 insertions(+)

    diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
    index 5980bdd..4a8404a 100644
    --- a/kernel/sched/fair.c
    +++ b/kernel/sched/fair.c
    @@ -4776,6 +4776,17 @@ static long effective_load(struct task_group *tg, int cpu, long wl, long wg)

    #endif

    +/*
    + * Returns the current capacity of cpu after applying both
    + * cpu and freq scaling.
    + */
    +static unsigned long capacity_curr_of(int cpu)
    +{
    + return cpu_rq(cpu)->cpu_capacity_orig *
    + arch_scale_freq_capacity(NULL, cpu)
    + >> SCHED_CAPACITY_SHIFT;
    +}
    +
    static inline bool energy_aware(void)
    {
    return sched_feat(ENERGY_AWARE);
    --
    1.9.1


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