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Subject[PATCH v4 8/9] sched/fair: defer task sched_avg attach to enqueue_entity()
Date
When wake_up_new_task(), we would use post_init_entity_util_avg()
to init util_avg/runnable_avg based on cpu's util_avg at that time,
then attach task sched_avg to cfs_rq.

Since enqueue_entity() would always attach any unattached task entity,
so we can defer this work to enqueue_entity().

post_init_entity_util_avg(p)
attach_entity_cfs_rq() --> (1)
activate_task(rq, p)
enqueue_task() := enqueue_task_fair()
enqueue_entity()
update_load_avg(cfs_rq, se, UPDATE_TG | DO_ATTACH)
if (!se->avg.last_update_time && (flags & DO_ATTACH))
attach_entity_load_avg() --> (2)

This patch defer attach from (1) to (2)

Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
---
kernel/sched/fair.c | 4 ----
1 file changed, 4 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 90aba33a3780..2063e30b2a8f 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -799,8 +799,6 @@ void init_entity_runnable_average(struct sched_entity *se)
/* when this task enqueue'ed, it will contribute to its cfs_rq's load_avg */
}

-static void attach_entity_cfs_rq(struct sched_entity *se);
-
/*
* With new tasks being created, their initial util_avgs are extrapolated
* based on the cfs_rq's current util_avg:
@@ -863,8 +861,6 @@ void post_init_entity_util_avg(struct task_struct *p)
se->avg.last_update_time = cfs_rq_clock_pelt(cfs_rq);
return;
}
-
- attach_entity_cfs_rq(se);
}

#else /* !CONFIG_SMP */
--
2.36.1
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