Messages in this thread Patch in this message | | | From | Jan H. Schönherr <> | Subject | [RFC 32/60] cosched: Specialize parent_cfs_rq() for hierarchical runqueues | Date | Fri, 7 Sep 2018 23:40:19 +0200 |
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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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