[RFC PATCH V2 0/3] sched/fair: Fix nr-running vs delayed-dequeue

[Xuewen Yan]

Delayed dequeued feature keeps a sleeping sched_entitiy enqueued until its
lag has elapsed. As a result, it stays also visible in rq->nr_running.
However, sometimes when using nr-running, we should not consider
sched-delayed tasks.
This serie fixes those by adding a helper function which return the
number of sched-delayed tasks. And when we should get the real runnable
tasks, we sub the nr-delayed tasks.

Changes sinc v1:
- add cover-letter
- add helper function;
- add more fixes

Xuewen Yan (3):
  sched/fair: Fixup-wake_up_sync-vs-DELAYED_DEQUEUE
  sched/fair: Do not consider the sched-delayed task when yield
  sched: Do not consider the delayed task when cpu is about to enter
    idle

 kernel/sched/core.c  |  2 +-
 kernel/sched/fair.c  | 10 +++++++---
 kernel/sched/sched.h |  5 +++++
 3 files changed, 13 insertions(+), 4 deletions(-)

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2.25.1