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    Subject[RFCv3 PATCH 29/48] sched: Highest energy aware balancing sched_domain level pointer
    Date
    Add another member to the family of per-cpu sched_domain shortcut
    pointers. This one, sd_ea, points to the highest level at which energy
    model is provided. At this level and all levels below all sched_groups
    have energy model data attached.

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

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

    diff --git a/kernel/sched/core.c b/kernel/sched/core.c
    index c49f3ee..e47febf 100644
    --- a/kernel/sched/core.c
    +++ b/kernel/sched/core.c
    @@ -5741,11 +5741,12 @@ DEFINE_PER_CPU(int, sd_llc_id);
    DEFINE_PER_CPU(struct sched_domain *, sd_numa);
    DEFINE_PER_CPU(struct sched_domain *, sd_busy);
    DEFINE_PER_CPU(struct sched_domain *, sd_asym);
    +DEFINE_PER_CPU(struct sched_domain *, sd_ea);

    static void update_top_cache_domain(int cpu)
    {
    struct sched_domain *sd;
    - struct sched_domain *busy_sd = NULL;
    + struct sched_domain *busy_sd = NULL, *ea_sd = NULL;
    int id = cpu;
    int size = 1;

    @@ -5766,6 +5767,14 @@ static void update_top_cache_domain(int cpu)

    sd = highest_flag_domain(cpu, SD_ASYM_PACKING);
    rcu_assign_pointer(per_cpu(sd_asym, cpu), sd);
    +
    + for_each_domain(cpu, sd) {
    + if (sd->groups->sge)
    + ea_sd = sd;
    + else
    + break;
    + }
    + rcu_assign_pointer(per_cpu(sd_ea, cpu), ea_sd);
    }

    /*
    diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
    index 86cf6b2..dedf0ec 100644
    --- a/kernel/sched/sched.h
    +++ b/kernel/sched/sched.h
    @@ -793,6 +793,7 @@ DECLARE_PER_CPU(int, sd_llc_id);
    DECLARE_PER_CPU(struct sched_domain *, sd_numa);
    DECLARE_PER_CPU(struct sched_domain *, sd_busy);
    DECLARE_PER_CPU(struct sched_domain *, sd_asym);
    +DECLARE_PER_CPU(struct sched_domain *, sd_ea);

    struct sched_group_capacity {
    atomic_t ref;
    --
    1.9.1


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