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    Subject[RFC PATCH 5/9] sched: Define macro for number of CPUs in core
    Date
    Introduce macro topology_sibling_weight for number of sibling CPUs in a
    core and use in select_idle_cpu

    Signed-off-by: subhra mazumdar <subhra.mazumdar@oracle.com>
    ---
    include/linux/topology.h | 4 ++++
    kernel/sched/fair.c | 2 +-
    2 files changed, 5 insertions(+), 1 deletion(-)

    diff --git a/include/linux/topology.h b/include/linux/topology.h
    index cb0775e..a85aea1 100644
    --- a/include/linux/topology.h
    +++ b/include/linux/topology.h
    @@ -190,6 +190,10 @@ static inline int cpu_to_mem(int cpu)
    #ifndef topology_sibling_cpumask
    #define topology_sibling_cpumask(cpu) cpumask_of(cpu)
    #endif
    +#ifndef topology_sibling_weight
    +#define topology_sibling_weight(cpu) \
    + cpumask_weight(topology_sibling_cpumask(cpu))
    +#endif
    #ifndef topology_core_cpumask
    #define topology_core_cpumask(cpu) cpumask_of(cpu)
    #endif
    diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
    index 23ec9c6..8856503 100644
    --- a/kernel/sched/fair.c
    +++ b/kernel/sched/fair.c
    @@ -6205,7 +6205,7 @@ static int select_idle_cpu(struct task_struct *p, struct sched_domain *sd, int t
    return -1;

    if (sched_feat(SIS_PROP)) {
    - floor = cpumask_weight(topology_sibling_cpumask(target));
    + floor = topology_sibling_weight(target);
    if (floor < 2)
    floor = 2;
    nr = (p->latency_nice * sd->span_weight) / LATENCY_NICE_MAX;
    --
    2.9.3
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