Newly forked task has not been enqueued, so should not be removed from cfs_rq in task_move_group_fair(). To do so, we identify newly forked tasks by their sched_avg's last_update_time in detach_entity_load_avg().
Signed-off-by: Yuyang Du <[email protected]> --- kernel/sched/fair.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 6e870c6..e0f219b 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -2943,6 +2943,10 @@ static inline void attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_en static void detach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) { + /* Newly forked tasks are not attached yet. */ + if (!se->avg.last_update_time) + return; + __update_load_avg(cfs_rq->avg.last_update_time, cpu_of(rq_of(cfs_rq)), &se->avg, se->on_rq * scale_load_down(se->load.weight), cfs_rq->curr == se, NULL); -- 1.7.9.5
