Odin reported some fairness problem between cgroup because of stalled value in cfs_rq->tg_load_avg_contrib: https://lkml.org/lkml/2021/5/18/566 2 problems generated this situation: -1st: After propagating load in the hierarchy, load_sum can be null whereas load_avg isn't so the cfs_rq is removed whereas it still contribute to th tg's load -2nd: cfs_rq->tg_load_avg_contrib was not always updated after significant changes like becoming null because cfs_rq had already been updated when propagating a child load. Vincent Guittot (2): sched/fair: keep load_avg and load_sum synced sched/fair: make sure to update tg contrib for blocked load kernel/sched/fair.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) -- 2.17.1
