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
