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    Subject[RFC 32/60] cosched: Specialize parent_cfs_rq() for hierarchical runqueues
    Date
    Make parent_cfs_rq() coscheduling-aware.

    Signed-off-by: Jan H. Schönherr <jschoenh@amazon.de>
    ---
    kernel/sched/fair.c | 13 +++++++++++++
    1 file changed, 13 insertions(+)

    diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
    index 8504790944bf..8cba7b8fb6bd 100644
    --- a/kernel/sched/fair.c
    +++ b/kernel/sched/fair.c
    @@ -284,12 +284,25 @@ static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp)
    return grp->my_q;
    }

    +#ifdef CONFIG_COSCHEDULING
    +static inline struct cfs_rq *parent_cfs_rq(struct cfs_rq *cfs_rq)
    +{
    + /*
    + * Only return TG parent (if valid), don't switch levels.
    + * Callers stay or expect to stay within the same level.
    + */
    + if (!cfs_rq->sdrq.tg_parent || !cfs_rq->sdrq.is_root)
    + return NULL;
    + return cfs_rq->sdrq.tg_parent->cfs_rq;
    +}
    +#else /* !CONFIG_COSCHEDULING */
    static inline struct cfs_rq *parent_cfs_rq(struct cfs_rq *cfs_rq)
    {
    if (!cfs_rq->tg->parent)
    return NULL;
    return cfs_rq->tg->parent->cfs_rq[cpu_of(rq_of(cfs_rq))];
    }
    +#endif /* !CONFIG_COSCHEDULING */

    static inline void list_add_leaf_cfs_rq(struct cfs_rq *cfs_rq)
    {
    --
    2.9.3.1.gcba166c.dirty
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