Performance Collector Scope and specific OS Requirements

[hitsub2]

What happened:

For different OS, the PSI and CPI would have different exposing directory or names. For examples, in Amazon Linux, when querying PSI, the directory is

cat /proc/pressure/cpu

But on Alios

cat /sys/fs/cgroup/cpuacct/cpu.pressure

My question is

1.what's the behaviour for koordinator to pick up different OS?

2.Any additional configuration should do?

What you expected to happen:

Environment:

• Koordinator version: - v0.6.2
• Kubernetes version (use kubectl version): v1.29
• docker/containerd version: containerd 1.7.11
• OS (e.g: cat /etc/os-release): Amazon Linux 2
• Kernel (e.g. uname -a): Linux ip-192-168-74-42.ec2.internal 5.10.213-201.855.amzn2.aarch64 ✨ Add NodeMetric API #1 SMP Mon Mar 25 18:16:08 UTC 2024 aarch64 aarch64 aarch64 GNU/Linux

Anything else we need to know:

[zwzhang0107]

PSI metrics are provided on pod level and node level.

For pod level, the value is record in cgroup files under kubepods dir. This is supported for both cgroup v1/v2 for anolis kernel but only cgroup v2 for upstream kernel version.
koordinator supports both cgroup v1/v2 in latest version, i think this can work well in any other OS.

For node level, /proc/pressure/cpu or cpu.pressure in cgroup root dir should be same. Now koordinator only supports cpu.pressure in cgroup root. I'm not sure whether PSI is supported in cgroup v1 for Amazon Linux, maybe you can try cgroup v2 in Amazon Linux.