This patchset enables the inclusion of CPUs in isolated cpuset partitions
in the cpu_is_isolated() check to reduce interference caused by vmstat
or memcg local stock flushing.

To reduce cpu_is_isolated() call overhead, a seqcount is used to
protect read access of the isolated cpumask without taking any lock. As
a result, the callback_lock is changed to a raw_spinlock_t to make it
work in PREEMPT_RT kernel too.

Waiman Long (2):
  cgroup/cpuset: Make callback_lock a raw_spinlock_t
  cgroup/cpuset: Include isolated cpuset CPUs in cpu_is_isolated() check

 include/linux/cpuset.h          |   6 ++
 include/linux/sched/isolation.h |   4 +-
 kernel/cgroup/cpuset.c          | 127 +++++++++++++++++++-------------
 3 files changed, 85 insertions(+), 52 deletions(-)

-- 
2.39.3