Apply suggestions from code review
Co-authored-by: Tim Bannister <tim@scalefactory.com> Signed-off-by: David Porter <david@porter.me>pull/35452/head
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@ -5,10 +5,11 @@ date: 2022-08-31
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slug: cgroupv2-ga-1-25
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---
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**Authors:**: David Porter (Google), Mrunal Patel (RedHat)
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**Authors:**: David Porter (Google), Mrunal Patel (Red Hat)
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Kubernetes 1.25 brings cgroup v2 to GA (general availability), letting the
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kubelet use the latest resource management capabilities.
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[kubelet](/docs/concepts/overview/components/#kubelet) use the latest container resource
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management capabilities.
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## What are cgroups?
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@ -33,30 +34,31 @@ unified control system with enhanced resource management capabilities.
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cgroup v2 has been development in the Linux Kernel since 2016 and in recent
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years has matured across the container ecosystem. With Kubernetes 1.25, cgroup
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v2 support is graduating to GA.
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v2 support has graduated to general availability.
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Many new Linux distributions have switched over to cgroup v2 by default so it's
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important that Kubernetes continues to work well on these new updated distros.
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Many recent releases of Linux distributions have switched over to cgroup v2 by
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default so it's important that Kubernetes continues to work well on these new
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updated distros.
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cgroup v2 offers several improvements over cgroup v1, such as the following:
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* Single unified hierarchy design in API
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* Safer sub-tree delegation to containers
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* Newer features like Pressure Stall Information
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* Newer features like [Pressure Stall Information](https://www.kernel.org/doc/html/latest/accounting/psi.html)
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* Enhanced resource allocation management and isolation across multiple resources
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* Unified accounting for different types of memory allocations (network and kernel memory, etc)
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* Accounting for non-immediate resource changes such as page cache write backs
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Some Kubernetes features exclusively use cgroup v2 for enhanced resource
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management and isolation. For example,
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the [MemoryQoS feature](https://kubernetes.io/blog/2021/11/26/qos-memory-resources/) improves
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memory QoS and relies on cgroup v2 functionality to enable it. New resource
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management features in the kubelet will also take advantage of the new cgroup
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v2 features moving forward.
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the [MemoryQoS feature](/blog/2021/11/26/qos-memory-resources/) improves
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memory utilization and relies on cgroup v2 functionality to enable it. New
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resource management features in the kubelet will also take advantage of the new
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cgroup v2 features moving forward.
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## How do you use cgroup v2?
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Many Linux distributions are switching to cgroup v2 by default, you might start
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Many Linux distributions are switching to cgroup v2 by default; you might start
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using it the next time you update the Linux version of your control plane and
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nodes!
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@ -76,7 +78,7 @@ refer to [Check your cgroup version](/docs/concepts/architecture/cgroups/#check-
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consult your distribution's documentation.
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If you're using a managed Kubernetes offering, consult your provider to
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determine how they're adopting cgroup v2.
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determine how they're adopting cgroup v2, and whether you need to take action.
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To use cgroup v2 with Kubernetes, you must meet the following requirements:
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@ -119,7 +121,7 @@ Scenarios in which you might need to update to cgroup v2 include the following:
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## Learn more
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* Read the [Kubernetes cgroup v2 documentation](/docs/concepts/architecture/cgroups)
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* Read the [Kubernetes cgroup v2 documentation](/docs/concepts/architecture/cgroups/)
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* Read the enhancement proposal, [KEP 2254](https://github.com/kubernetes/enhancements/blob/master/keps/sig-node/2254-cgroup-v2/README.md)
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* Learn more about
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[cgroups](https://man7.org/linux/man-pages/man7/cgroups.7.html) on Linux Manual Pages
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