* of reads may not be immediately reflected on the algorithm's data structures. These structures
   * are guarded by a lock and operations are applied in batches to avoid lock contention. The
   * penalty of applying the batches is spread across threads so that the amortized cost is slightly
   * higher than performing just the operation without enforcing the capacity constraint.
   *

* Add a flag allowing contention profiling of the API server ([#36756](https://github.com/kubernetes/kubernetes/pull/36756), [@gmarek](https://github.com/gmarek))

    * cAdvisor: Fix brtfs filesystem discovery
    * cAdvisor: Fix race condition with AllDockerContainers
    * cAdvisor: Don't watch .mount cgroups
    * cAdvisor: Reduce lock contention during list containers
* Promote ScheduleDaemonSetPods by default scheduler to beta ([#67899](https://github.com/kubernetes/kubernetes/pull/67899), [@ravisantoshgudimetla](https://github.com/ravisantoshgudimetla))

* Fix comment and optimize code ([#38084](https://github.com/kubernetes/kubernetes/pull/38084), [@tanshanshan](https://github.com/tanshanshan))
* Add flag to enable contention profiling in scheduler. ([#37357](https://github.com/kubernetes/kubernetes/pull/37357), [@gmarek](https://github.com/gmarek))

As an alpha feature, Kubernetes v1.22 can use the cgroups v2 API to control memory allocation and isolation. This feature is designed to improve workload and node availability when there is contention for memory resources.

### API changes and improvements for ephemeral containers