[PATCH 0/6] sched/deadline: cpuset task acceptance review

[Daniel Bristot de Oliveira]

While surveying the properties of the SCHED_DEADLINE, Marco Perronet found some
inconsistencies in the acceptance of DL threads on cpuset. More precisely,
regarding the acceptance of treads with arbitrary affinity. He contacted me,
and while doing the investigation, we found yet other potential issues
addressed in this patch series.

Each patch has a more in-depth explanation, including ways to reproduce
the problem. 

Daniel Bristot de Oliveira (6):
  sched/deadline: Consolidate the SCHED_DL task_can_attach() check on
    its own function
  sched/deadline: Inform dl_task_can_attach() if the cpuset is exclusive
  sched/deadline: Allow DL tasks on empty (cgroup v2) cpusets
  sched/deadline: Block DL tasks on non-exclusive cpuset if bandwitdh
    control is enable
  sched/deadline: Add helpers to get the correct root domain/span/dl_bw
  sched/deadline: Fixes cpu/rd/dl_bw references for suspended tasks

 include/linux/sched.h   |  2 +-
 kernel/cgroup/cpuset.c  |  5 ++++-
 kernel/sched/core.c     | 13 ++++++------
 kernel/sched/deadline.c | 28 ++++++++++++++++++++++---
 kernel/sched/sched.h    | 45 ++++++++++++++++++++++++++++++++++++++++-
 5 files changed, 80 insertions(+), 13 deletions(-)

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2.29.2